Record 1 of 362

Title: Heterostructure nanocluster MOF-derived Ag-CuO: An emerging material for harmonic soliton pulses generation

Author(s): Luo, WF (Luo, Wenfeng); Sun, PH (Sun, Penghuan); Wu, ZY (Wu, Ziyan); Ban, XQ (Ban, Xiaoqiang); Zhang, TT (Zhang, Tingting); Zhao, Y (Zhao, Yang); Li, XH (Li, Xiaohui); Yu, XC (Yu, Xuechao); Shan, GC (Shan, Guangcun); Zhao, XX (Zhao, Xiaoxia)

Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 136  Article Number: 105052  DOI: 10.1016/j.infrared.2023.105052  Early Access Date: DEC 2023   Published: JAN 2024  

Abstract: In recent years, metal-organic framework (MOF) and their derivatives have attracted many researchers due to excellent characteristics, such as good stability, high capacity, and a modest third order nonlinear optical response. Compared with conventional optical materials, MOF-oxide are easier to benefit photonic research. However, for nonlinear optics and ultrafast photonics, research on MOFs-Transition metal oxide is still in its infancy. In this work, MOF-derived Ag-CuO was prepared by hydrothermal method and applied in passively mode-locked fiber laser. Experimental results show that MOF-derived Ag-CuO possesses excellent optical absorption, functioning as a saturable absorber (SA). The laser based on MOF-derived Ag-CuO SA realizes three different mode-locking states, including traditional soliton with the pulse width of 1.04 ps, 32nd order harmonic soliton molecule, and soliton rain pulse, with the signal-to-noise ratio (SNR) of 73 dB. This work lays the foundation of its application in ultrashort photonics and optical communication, broadening the future of MOFderived Ag-CuO.

Accession Number: WOS:001164838900001

ISSN: 1350-4495

eISSN: 1879-0275

Record 2 of 362

Title: All-polarization-maintaining mode-locked Holmium-doped fiber laser based upon nonlinear polarization evolution

Author(s): Tu, LS (Tu, Lisha); Tang, ZY (Tang, Ziya); Li, KY (Li, Keyi); Wang, JC (Wang, Jiachen); Lin, H (Lin, Hua); Zhang, WF (Zhang, Wenfei); Lue, QT (Lue, Qitao); Guo, CY (Guo, Chunyu); Ruan, SC (Ruan, Shuangchen)

Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 136  Article Number: 105054  DOI: 10.1016/j.infrared.2023.105054  Early Access Date: DEC 2023   Published: JAN 2024  

Abstract: An all-polarization-maintaining, all-fiberized holmium (Ho) doped fiber laser mode-locked by nonlinear polarization evolution (NPE) is experimentally demonstrated for the first time. The NPE mechanism is realized via the combination of a polarizer and the cross-fusion of three sections of polarization maintaining (PM) fibers. With the appropriate manipulation of the splicing angles between the birefringent axes of the PM fibers, a highly stable mode locked operation is realized. The laser delivers stable dissipative-soliton resonance (DSR) pulses with a repetition rate of 10.34 MHz and an average power of 223.95 mW, corresponding to a pulse energy of 21.64 nJ and a peak power of 11 W. Furthermore, the output power test over 2 h implies superior stability of this design. The oscillator, performing the characteristics of self-starting, high pulse energy, and good stability, is attractive and promising for various practical application.

Accession Number: WOS:001164780000001

ISSN: 1350-4495

eISSN: 1879-0275

Record 3 of 362

Title: Impaired orienting function detected through eye movements in patients with temporal lobe epilepsy

Author(s): Wen, SR (Wen, Shirui); Zhang, HYM (Zhang, Huangyemin); Huang, KL (Huang, Kailing); Wei, XJ (Wei, Xiaojie); Yang, K (Yang, Ke); Wang, Q (Wang, Quan); Feng, L (Feng, Li)

Source: FRONTIERS IN NEUROSCIENCE  Volume: 17  Article Number: 1290959  DOI: 10.3389/fnins.2023.1290959  Published: DEC 22 2023  

Abstract: Objective: Patients with temporal lobe epilepsy (TLE) often exhibit attention function impairment. The orienting network is the subsystem of the attention network that has not been fully studied. In this study, we used eye-tracking technology with an attention network test (ANT)-based task to assess the orienting function of TLE patients, aiming to characterize their eye movement patterns.Methods: A total of 37 TLE patients and 29 healthy controls (HCs) completed the ANT task based on eye-tracking technology. Orienting function damage was mainly assessed by the ANT orienting effect. Eye movement metrics, such as mean first goal-directed saccade latency (MGSL), total saccades, and saccade amplitudes, were compared between groupsResults: The TLE patients had a significantly lower ANT orienting effect (HC, 54.05 +/- 34.05; TLE, 32.29 +/- 39.54) and lower eye-tracking orienting effect (HC, 116.98 +/- 56.59; TLE, 86.72 +/- 59.10) than those of the HCs. The larger orienting effects indicate that orienting responses are faster when receiving a spatial cue compared with a center cue. In the spatial cue condition, compared with HCs, the TLE group showed a longer first goal-directed saccade latency (HC, 76.77 +/- 58.87 ms; TLE, 115.14 +/- 59.15 ms), more total saccades (HC, 28.46 +/- 12.30; TLE, 36.69 +/- 15.13), and larger saccade amplitudes (HC, 0.75 degrees +/- 0.60 degrees; TLE, 1.36 degrees +/- 0.89 degrees). Furthermore, there was a positive correlation of the orienting-effect score between the ANT task and eye-tracking metrics (r = 0.58, p < 0.05).Conclusion: We innovatively developed a new detection method using eye-tracking technology in combination with an ANT-based task to detect the orienting function in TLE patients. The current research demonstrated that TLE patients had a significant orienting dysfunction with a specific saccade pattern characterized by a longer first goal-directed saccade latency, more total saccades, and larger saccade amplitudes. These oculomotor metrics are likely to be a better indicator of orienting function and may potentially be used for behavioral-based interventions and long-term cognition monitoring in TLE patients.

Accession Number: WOS:001136470100001

PubMed ID: 38188032

eISSN: 1662-453X

Record 4 of 362

Title: Lanthanide composite as doping reagent simplifies and uniformizes deposition of fiber preforms

Author(s): Huang, QQ (Huang, Qingqing); Zhang, YT (Zhang, Yuting); She, SF (She, Shengfei); Fan, W (Fan, Wei); Hou, CQ (Hou, Chaoqi); Xu, HB (Xu, Hai-Bing)

Source: CELL REPORTS PHYSICAL SCIENCE  Volume: 4  Issue: 12  Article Number: 101716  DOI: 10.1016/j.xcrp.2023.101716  Early Access Date: DEC 2023   Published: DEC 20 2023  

Abstract: Controlling the volatilization and diffusion of co-dopants to afford the uniform distribution of co-doping lanthanide elements with appropriate concentration is crucial to ytterbium (Yb)/erbium (Er) co-doped fiber preforms. Here, volatile and thermostable lanthanide composite Yb0.95Er0.05(thd)(3) is proposed and demonstrated to practicably regulate the doping concentration by the fixed Yb/Er molar ratio in the formation, suitable for continuous deposition with simply one raw material transfer line for both Yb and Er elements. Benefiting from more uniform distributions and higher Yb -> Er energy transfer efficiency, stronger Er-III-based emission of the Er/Yb co-doped fiber preforms prepared with Yb0.95Er0.05(thd)(3) than that with traditional Yb(thd)(3)/Er(thd)(3) is achieved. This work highlights the advantage of this lanthanide composite as a doping reagent in simplifying and uniformizing the deposition of lanthanide-doped fiber preforms, and it establishes the relationship between the doping reagent at molecular levels and the performance of fiber preforms.

Accession Number: WOS:001144646200001

Author Identifiers:

eISSN: 2666-3864

Record 5 of 362

Title: Research on polarization characteristics of background light by modified polarization difference imaging method

Author(s): Xu, JH (Xu, Jing-Han); Wu, GJ (Wu, Guo-Jun); Jing, D (Jing, Dong); Yang, Y (Yang, Yu); Fei, F (Fei, Feng); Bo, L (Bo, Liu)

Source: ACTA PHYSICA SINICA  Volume: 72  Issue: 24  Article Number: 244201  DOI: 10.7498/aps.72.20230639  Published: DEC 20 2023  

Abstract: The random scattering event of light by water medium is the primary reason for the degradation in underwater imaging. Underwater polarization imaging technology can enhance the signal-to-noise ratio of imaging effectively by utilizing the polarization information difference between background scattered light and target light. However, as scattering events increase in the water body, it is difficult to maintain the polarization characteristics of light, which reduces the effect of removing scattering based on polarization characteristics. In addition, the polarization rule of background scattered light in water is unclear, and there is a lack of quantitative description of the polarization characteristics of scattered light. Therefore, the study of polarization transmission characteristics of underwater scattered light is of great significance in reducing the scattering light of underwater polarization imaging.In order to clarify the polarization characteristics of underwater background scattered light, especially the polarization angle information, this paper proposes a method for ascertaining polarization angle of background light based on modified polarization difference imaging method. In this method, the coupling relationship between optimal weight coefficient and enhancement measure evaluation (EME) value of the Stokes vector difference result is analyzed, and the background light polarization angle is calculated based on the optimal weight coefficient. Combined with the experimental results, the EME distribution trend of the optimal weight coefficient and the modified polarization difference imaging method results in different turbidity water bodies are determined, the scattering suppression limit is explored, and the trend of background scattered light polarization direction with turbidity of water is analyzed. The results show that the proposed method can obtain the exact polarization angle of background scattered light in different water environments, revealing a trend that the polarization direction of background scattered light becomes orthogonal to the incident light direction as the turbidity of the water increases. This research provides a methodological basis for determining the polarization direction of the background scattered light in underwater imaging.

Accession Number: WOS:001161691700005

ISSN: 1000-3290

Record 6 of 362

Title: Bi2O2S topological transformation and in-situ regrowth of [hk1]-oriented SbBiS3-xSex 2D skeleton structure for construction of efficient quasi-two-dimensional Sb2S3-xSex-based heterojunction photoanodes

Author(s): Zhang, LY (Zhang, Liyuan); Liu, XY (Liu, Xinyang); Liu, DK (Liu, Dekang); Cheng, YF (Cheng, Yufei); Li, QJ (Li, Qiujie); Wang, YS (Wang, Yishan); Hu, XY (Hu, Xiaoyun); Miao, H (Miao, Hui)

Source: SEPARATION AND PURIFICATION TECHNOLOGY  Volume: 334  Article Number: 125983  DOI: 10.1016/j.seppur.2023.125983  Early Access Date: DEC 2023   Published: APR 14 2024  

Abstract: Antimony chalcogenides (Sb2S3-xSex), as one of the promising light-absorbing materials in optoelectronic energy storage devices, has attracted widespread attention in recent years. Of particular note, its crystal structure consists of the one-dimensional [Sb4S(Se)6]n ribbons with efficient carrier transport efficiency along the [hk1] direction. In this paper, with the aid of the topological transformation of the layered material Bi2O2S, the SbBiS3-xSex bimetallic alloy with 2D skeleton structure was induced to grow in situ, and the conversion of Sb2S3-xSex preferred orientation from [hk0] to [hk1] was realized. The corresponding results showed that 2D skeleton structure was conducive to the construction of photo traps and the increase of electrochemical specific surface area. In addition, Bi2O2S acted as an electron transport layer (ETL) to further promote the migration of photo-generated carriers. At 1.23 V vs. RHE, the photocurrent density of quasi-two-dimensional Bi2O2S/SbBiS3-xSex nanosheet photoanode was as high as 6.41 mA cm-2, which was 7.5 times that of pure Sb2S3-xSex, and the peak value of IPCE could reach 40.93%. This work undoubtedly opens up a new avenue for the designing high-efficiency antimony chalcogenides photoelectrodes.

Accession Number: WOS:001143160800001

ISSN: 1383-5866

eISSN: 1873-3794

Record 7 of 362

Title: Space advanced technology demonstration satellite

Author(s): Zhang, XF (Zhang, Xiaofeng); Chen, W (Chen, Wen); Zhu, XC (Zhu, Xiaocheng); Meng, N (Meng, Na); He, JW (He, Junwang); Bi, XZ (Bi, Xingzi); Zhang, YH (Zhang, Yonghe); Shi, Q (Shi, Qi); Li, F (Li, Fei); Liu, R (Liu, Rui); Feng, ZG (Feng, Zhenggong); Liu, L (Liu, Liu); Li, JS (Li, Jinsong); Wu, HC (Wu, Haichen); Xu, DX (Xu, Dongxiao); Li, TJ (Li, Taijie); Huang, JJ (Huang, Jiangjiang); Liu, S (Liu, Shuo); Li, TT (Li, Tiantong); Yu, XS (Yu, Xiansheng); Gao, Y (Gao, Yang); Zhou, H (Zhou, Heng); Ban, HY (Ban, Hanyu); Zhang, YL (Zhang, Yanli); Zhang, YT (Zhang, Yueting); Yang, YQ (Yang, Yingquan); He, T (He, Tao); Duan, XL (Duan, Xuliang); Chen, X (Chen, Xin); Wang, YM (Wang, Yamin); Sun, AT (Sun, Antai); Zhang, KX (Zhang, Kuoxiang); Sun, Y (Sun, Ying); Wang, YB (Wang, Yaobin); Fan, CC (Fan, Chengcheng); Xiong, SL (Xiong, Shaolin); Li, XQ (Li, Xinqiao); Wen, XY (Wen, Xiangyang); Ling, ZX (Ling, Zhixing); Sun, XJ (Sun, Xiaojin); Zhang, C (Zhang, Chen); Bai, XY (Bai, Xianyong); Wang, ZS (Wang, Zhanshan); Deng, YY (Deng, Yuanyong); Tian, H (Tian, Hui); Yang, JF (Yang, Jianfeng); Xue, HB (Xue, Hongbo); Sang, P (Sang, Peng); Liu, JG (Liu, Jinguo); Zheng, HL (Zheng, Huilong); Zhu, X (Zhu, Xiang); He, JW (He, Jianwu); Li, H (Li, Hui); Xu, LX (Xu, Luxiang); Xu, SY (Xu, Shuyan); Chen, WW (Chen, Wenwu); Liu, ZD (Liu, Zhendong); Wang, ZL (Wang, Zhaoli); Mao, XL (Mao, Xianglong); Gao, R (Gao, Rong); Li, ZX (Li, Zongxuan); Ding, GP (Ding, Guopeng); Wang, XY (Wang, Xinyu); Dou, RJ (Dou, Runjiang); Weng, LB (Weng, Lubin); Luo, H (Luo, Hao); Wang, YP (Wang, Yaping); Liang, XF (Liang, Xianfeng); Fang, ZR (Fang, Ziruo)

Source: SCIENCE CHINA-TECHNOLOGICAL SCIENCES  Volume: 67  Issue: 1  Special Issue: SI  Pages: 197-208  DOI: 10.1007/s11431-023-2510-x  Early Access Date: DEC 2023   Published: JAN 2024  

Abstract: The Space Advanced Technology demonstration satellite (SATech-01), a mission for low-cost space science and new technology experiments, organized by Chinese Academy of Sciences (CAS), was successfully launched into a Sun-synchronous orbit at an altitude of similar to 500 km on July 27, 2022, from the Jiuquan Satellite Launch Centre. Serving as an experimental platform for space science exploration and the demonstration of advanced common technologies in orbit, SATech-01 is equipped with 16 experimental payloads, including the solar upper transition region imager (SUTRI), the lobster eye imager for astronomy (LEIA), the high energy burst searcher (HEBS), and a High Precision Magnetic Field Measurement System based on a CPT Magnetometer (CPT). It also incorporates an imager with freeform optics, an integrated thermal imaging sensor, and a multi-functional integrated imager, etc. This paper provides an overview of SATech-01, including a technical description of the satellite and its scientific payloads, along with their on-orbit performance.

Accession Number: WOS:001133133000007

Author Identifiers:

ISSN: 1674-7321

eISSN: 1869-1900

Record 8 of 362

Title: Redundant information model for Fourier ptychographic microscopy

Author(s): Gao, HQ (Gao, Huiqin); Pan, A (Pan, An); Gao, YT (Gao, Yuting); Zhang, Y (Zhang, Yu); Wan, QZ (Wan, Quanzhen); Mu, TK (Mu, Tingkui); Yao, BL (Yao, Baoli)

Source: OPTICS EXPRESS  Volume: 31  Issue: 26  Pages: 42822-42837  DOI: 10.1364/OE.505407  Published: DEC 18 2023  

Abstract: Fourier ptychographic microscopy (FPM) is a computational optical imaging technique that overcomes the traditional trade-off between resolution and field of view (FOV) by exploiting abundant redundant information in both spatial and frequency domains for high -quality image reconstruction. However, the redundant information in FPM remains ambiguous or abstract, which presents challenges to further enhance imaging capabilities and deepen our understanding of the FPM technique. Inspired by Shannon's information theory and extensive experimental experience in FPM, we defined the specimen complexity and reconstruction algorithm utilization rate and reported a model of redundant information for FPM to predict reconstruction results and guide the optimization of imaging parameters. The model has been validated through extensive simulations and experiments. In addition, it provides a useful tool to evaluate different algorithms, revealing a utilization rate of 24%+/- 1% for the Gauss -Newton algorithm, LED Multiplexing, Wavelength Multiplexing, EPRY-FPM, and GS. In contrast, mPIE exhibits a lower utilization rate of 19%+/- 1%. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Accession Number: WOS:001155193000005

PubMed ID: 38178392

Author Identifiers:

ISSN: 1094-4087

Record 9 of 362

Title: Ultra-short wavelength of 1.7 μm ultrafast Tm-doped fiber laser

Author(s): Xiao, XS (Xiao, Xusheng); Li, L (Li, Lu); Wang, WQ (Wang, Weiqiang); Chen, ZY (Chen, ZhiYong); Yan, PG (Yan, Peiguang); Guo, HT (Guo, Haitao)

Source: APPLIED PHYSICS LETTERS  Volume: 123  Issue: 25  Article Number: 251112  DOI: 10.1063/5.0173713  Published: DEC 18 2023  

Abstract: Thulium-doped fiber lasers (TDFLs) operating at 1.7 mu m have immense potential for multiphoton microscopy and imaging applications. However, further research and development are needed, particularly in the ultra-short wavelength range below 1720 nm. Herein, we demonstrate the mode-locked TDFL at 1.7 mu m, utilizing a microfiber InSb saturable absorber. By employing intracavity filters, optimizing the gain fiber length, and incorporating a broadband evanescent field absorber, we achieve high-performance ultra-short wavelength solitons in the TDFL. The solitons exhibit a central wavelength of 1707 nm, a pulse width of 895 fs, a repetition rate of 23.36 MHz, and a single pulse energy of 1.7 nJ. Moreover, our experiments demonstrate the generation of diverse soliton states, including high-order harmonic and bound solitons. We also explore the dynamics of mode-locking through experimental investigations. Our findings establish a solid foundation for the research and control of diverse 1.7 mu m mode-locked operation state, advancing the field of ultrafast fiber lasers in this wavelength band.

Accession Number: WOS:001127529600005

ISSN: 0003-6951

eISSN: 1077-3118

Record 10 of 362

Title: Rapid prediction of regenerator performance for regenerative cryogenics cryocooler based on convolutional neural network

Author(s): Chen, XT (Chen, Xiantong); Li, SS (Li, Shanshan); Yu, J (Yu, Jun); Yang, S (Yang, Sen); Chen, H (Chen, Hao)

Source: INTERNATIONAL JOURNAL OF REFRIGERATION  Volume: 158  Pages: 225-237  DOI: 10.1016/j.ijrefrig.2023.11.025  Early Access Date: DEC 2023   Published: FEB 2024  

Abstract: The regenerator is the core component of the regenerative cryogenic refrigerator, for its structure sizes, operating parameters and phase characteristics at the cold and hot ends co-determine the power and efficiency of the refrigerator, and the design parameters of other coupled components. Efficiently predicting the regenerator performance can reduce the design period of cryogenic refrigerators. Addressing the long computational time constraints in the traditional numerical simulation methods, a novel approach based on a one-dimensional convolutional neural network (1D-CNN) was proposed. Initially, a program capable of multi-threading and automatically running the specialized regenerator calculation software REGEN 3.3 was developed. The performance of the regenerators with various parameter combinations at the cold end temperature of 60-120 K were calculated and 181,440 pieces of data were obtained. Subsequently, the architecture and hyperparameters of the model were determined. The trained model exhibits an average relative error of 3.83% for predicting regenerator power, 0.13% for predicting pressure ratio at the hot end, and 1.55% for predicting the coefficient of performance (COP). The model's generalization ability was confirmed by generating data points beyond the original dataset. Additionally, the model allows for the simultaneous calculation of multiple sets of irregular regenerator parameters, and reduces the calculation time from 2500 min for 1000 pieces using REGEN 3.3 software to just 130 ms, representing a decrease by nearly six orders of magnitude. This approach effectively resolves the long computation time associated with traditional numerical simulation methods, and will present a new solution for the rapid and precise design of regenerators.

Accession Number: WOS:001139904900001

ISSN: 0140-7007

eISSN: 1879-2081

Record 11 of 362

Title: Multi-scale convolutional neural networks and saliency weight maps for infrared and visible image fusion

Author(s): Yang, CX (Yang, Chenxuan); He, YN (He, Yunan); Sun, C (Sun, Ce); Chen, BK (Chen, Bingkun); Cao, J (Cao, Jie); Wang, YT (Wang, Yongtian); Hao, Q (Hao, Qun)

Source: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  Volume: 98  Article Number: 104015  DOI: 10.1016/j.jvcir.2023.104015  Early Access Date: DEC 2023   Published: FEB 2024  

Abstract: Image fusion is the fusion of multiple images from the same scene to produce a more informative image, and infrared and visible image fusion is an important branch of image fusion. To tackle the issues of diminished luminosity in the infrared target, inconspicuous target features, and blurred texture of the fused image after the fusion of infrared and visible images. This paper introduces a novel effective fusion framework that merges multiscale Convolutional Neural Networks (CNN) with saliency weight maps. First, the method measures the source image features to estimate the initial saliency weight map. Then, the initial weight map is segmented and optimized using a guided filter before being further processed by CNN. Next, a trained Siamese convolutional network is used to solve the two key problems of activity measure and weight assignment. Meanwhile, a multilayer fusion strategy is designed to effectively retain the luminance of the infrared target and the texture information in the visible background. Finally, adaptive adjustment of the fusion coefficients is achieved by employing saliency. The experimental results show that the method outperforms the state-of-the-art algorithms in terms of both subjective visual quality and objective evaluation effects.

Accession Number: WOS:001164113200001

Author Identifiers:

ISSN: 1047-3203

eISSN: 1095-9076

Record 12 of 362

Title: Improving the Laser-Induced Breakdown Spectroscopy for Highly Efficient Trace Measurement of Hazardous Components in Waste Oils

Author(s): Xu, BP (Xu, Boping); Liu, YH (Liu, Yinghua); Yin, PQ (Yin, Peiqi); Li, M (Li, Ming); Zhang, WF (Zhang, Wenfu); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Tang, J (Tang, Jie); Duan, YX (Duan, Yixiang)

Source: ANALYTICAL CHEMISTRY  Volume: 95  Issue: 51  Pages: 18685-18690  DOI: 10.1021/acs.analchem.3c03579  Published: DEC 12 2023  

Abstract: Improper disposal of waste oils containing hazardous components damages the environment and the ecosystem, posing a significant threat to human life and health. Here, we present a method of discharge-assisted laser-induced breakdown spectroscopy combined with filter paper sampling (DA-LIBS-FPS) to detect hazardous components and trace the source of polluting elements. DA-LIBS-FPS significantly enhances spectral intensity by 1-2 orders of magnitude due to the discharge energy deposition into the laser-induced plasma and the highly efficient laser-sample interaction on the filter paper, when compared to single-pulse LIBS with silica wafer sampling (SP-LIBS-SWS). Additionally, the signal-to-noise ratio and the signal-to-background ratio are both significantly increased. Resultantly, indiscernible lines, such as CN and Cr I, are well distinguished. In contrast with DA-LIBS combined with silica wafer sampling (DA-LIBS-SWS), the spectral signal fluctuations in DA-LIBS-FPS are reduced by up to 33%, because of the homogeneous distribution of the oil layer on the filter paper in FPS. Further examination indicates that the limit of detection for Ba is reduced from a several parts per million level in SP-LIBS-SWS to a dozens of parts per billion level in DA-LIBS-FPS, i.e., nearly 2 orders of magnitude enhancement in analysis sensitivity. This improvement is attributed to the extended plasma lifespan in DA-LIBS and the increasing electron density and plasma temperature in FPS. DA-LIBS-FPS provides a low-cost, handy, rapid, and highly sensitive avenue to analyze the hazardous components in waste oils with great potential in environmental and ecological monitoring.

Accession Number: WOS:001132959900001

PubMed ID: 38086761

Author Identifiers:

ISSN: 0003-2700

eISSN: 1520-6882

Record 13 of 362

Title: Multi-harmonic structured illumination-based optical diffraction tomography

Author(s): Liu, RH (Liu, Ruihua); Wen, K (Wen, Kai); Li, JY (Li, Jiaoyue); Ma, Y (Ma, Ying); Zheng, JJ (Zheng, Juanjuan); An, S (An, Sha); Min, JW (Min, Junwei); Zalevsky, Z (Zalevsky, Zeev); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng)

Source: APPLIED OPTICS  Volume: 62  Issue: 35  Pages: 9199-9206  DOI: 10.1364/AO.508138  Published: DEC 10 2023  

Abstract: Imaging speed and spatial resolution are key factors in optical diffraction tomography (ODT), while they are mutually exclusive in 3D refractive index imaging. This paper presents a multi-harmonic structured illuminationbased optical diffraction tomography (MHSI-ODT) to acquire 3D refractive index (RI) maps of transparent samples. MHSI-ODT utilizes a digital micromirror device (DMD) to generate structured illumination containing multiple harmonics. For each structured illumination orientation, four spherical spectral crowns are solved from five phase-shifted holograms, meaning that the acquisition of each spectral crown costs 1.25 raw images. Compared to conventional SI-ODT, which retrieves two spectral crowns from three phase-shifted raw images, MHSI-ODT enhances the imaging speed by 16.7% in 3D RI imaging. Meanwhile, MHSI-ODT exploits both the 1st-order and the 2nd-order harmonics; therefore, it has a better intensity utilization of structured illumination. We demonstrated the performance of MHSI-ODT by rendering the 3D RI distributions of 5 mu m polystyrene (PS) microspheres and biological samples. (c) 2023 Optica Publishing Group

Accession Number: WOS:001127517600004

PubMed ID: 38108690

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 14 of 362

Title: Multiple PAHs' Detection under CDOM Interference Based on Excitation-Emission Matrix and Interval Selection

Author(s): Li, RZ (Li, Ruizhuo); Gao, LM (Gao, Limin); Wu, GJ (Wu, Guojun); Dong, J (Dong, Jing)

Source: JOURNAL OF SPECTROSCOPY  Volume: 2023  Article Number: 7105348  DOI: 10.1155/2023/7105348  Published: DEC 8 2023  

Abstract: Fluorescence technology is an effective tool for detecting polycyclic aromatic hydrocarbons (PAHs) in water. However, the accuracy of fluorescence detection is reduced by the spectral overlap of different PAHs and coexisting colored dissolved organic matter (CDOM). In this study, a single-excitation interval selection method based on an excitation-emission matrix is proposed to quantify four PAHs: fluorene, pyrene, phenanthrene, and benzo(a)pyrene under CDOM interference. The optimal excitation wavelength for each PAH was obtained by stability analysis, based on which the optimal emission interval was obtained by chaotic particle swarm optimization. The partial least squares (PLS) prediction models of four PAHs under interference were established. On comparing with other modeling methods, the results show that the models with interval selection have better prediction accuracy (mean relative error < 10%) under CDOM interference. The recovery rate and limit of detection of the method were also evaluated. This study provides a new and helpful strategy for fluorescence detection of interfering PAHs in water.

Accession Number: WOS:001129714800001

Author Identifiers:

ISSN: 2314-4920

eISSN: 2314-4939

Record 15 of 362

Title: A different view on the deactivation process of 3-hydroxy-salicylidene-methylamine system

Author(s): Han, GX (Han, Guoxia); Wei, HY (Wei, Hongyan); Yu, XH (Yu, Xianghua); Zhang, JL (Zhang, Jialing); Ma, YB (Ma, Yanbin); Liu, P (Liu, Peng)

Source: CHEMICAL PHYSICS LETTERS  Volume: 835  Article Number: 141004  DOI: 10.1016/j.cplett.2023.141004  Early Access Date: DEC 2023   Published: JAN 16 2024  

Abstract: Schiff bases stand out as a highly significant class of photochromic materials with widespread applications. The exploration of their photochromic mechanisms has garnered substantial interest over the past decades. In this work, we investigated the photochromic mechanism of 3-hydroxy-salicylidene methylamine (3-OH-SMA) by high-level electronic structure calculations and on-the-fly excited state dynamics simulations. Our investigation revealed the identification of three minimum energy conical intersections between S1 and S0 states, while only the one characterized by the central C = N bond twisting motion was involved in the deactivation process. This finding contrasts with previous reports, suggesting that the excited state intramolecular proton transfer (ESIPT) process was the main reaction channel in 3-OH-SMA. The proposed new decay mechanism provides valuable theoretical insights, paving the way for the further enhancement or rational design of photochromic materials.

Accession Number: WOS:001134840800001

Author Identifiers:

ISSN: 0009-2614

eISSN: 1873-4448

Record 16 of 362

Title: Frontal lobe epilepsy: an eye tracking study of memory and attention

Author(s): Zhang, Q (Zhang, Qiong); Sun, WF (Sun, Weifeng); Huang, KL (Huang, Kailing); Qin, L (Qin, Li); Wen, SR (Wen, Shirui); Long, XY (Long, Xiaoyan); Wang, Q (Wang, Quan); Feng, L (Feng, Li)

Source: FRONTIERS IN NEUROSCIENCE  Volume: 17  Article Number: 1298468  DOI: 10.3389/fnins.2023.1298468  Published: DEC 5 2023  

Abstract: Objective To explore the characteristics and mechanisms of working memory impairment in patients with frontal lobe epilepsy (FLE) through a memory game paradigm combined with eye tracking technology.Method We included 44 patients with FLE and 50 healthy controls (HC). All participants completed a series of neuropsychological scale assessments and a short-term memory game on an automated computer-based memory evaluation platform with an eye tracker.Results Memory scale scores of FLE patients including digit span (U = 747.50, p = 0.007), visual recognition (U = 766.50, p = 0.010), and logical memory (U = 544.00, p < 0.001) were significantly lower than HC. The patients with FLE took longer to complete the four levels of difficulty of the short-term memory game than healthy controls (level 1: U = 2974.50, p = 0.000; level 2: U = 3060.50, p = 0.000; level 3: U = 2465.00, p = 0.000; level 4: U = 2199.00, p = 0.000). During the memory decoding period, first fixation on the targets took significantly longer for FLE patients for all difficulty levels compared to controls (level 1: U = 3407.00, p = 0.008; level 2: U = 3618.00, p = 0.036; level 3: U = 3345.00, p = 0.006; level 4: U = 2781.00, p = 0.000). The average fixation duration per target among patients with FLE was found to be significantly longer compared to HC (level 1: U = 2994.50, p = 0.000; level 2: U = 3101.00, p = 0.000; level 3: U = 2559.50, p = 0.000; level 4: U = 2184.50, p = 0.000). The total fixation duration on AOI/total completion time of FLE patients was significantly lower than those of HC for levels 1 to 3 (level 1: U = 1557.00, p = 0.000; level 2: U = 2333.00, p = 0.000; level 3: U = 2757.00, p = 0.000). Furthermore, the eye tracking data during the memory decoding phase were correlated with neuropsychological scale scores (p < 0.05).Conclusion Patients with FLE exhibited short-term memory impairment probably due to deficits in attentional maintenance, especially during the memory decoding phase. Eye tracking technology provided the possibility to help separate and quantify visual attention from memory processing, contributing to exploring underlying mechanisms of memory impairment in FLE.

Accession Number: WOS:001127610100001

PubMed ID: 38116071

eISSN: 1662-453X

Record 17 of 362

Title: Infrared imaging of magnetic octupole domains in non-collinear antiferromagnets

Author(s): Wang, P (Wang, Peng); Xia, W (Xia, Wei); Shen, JH (Shen, Jinhui); Chen, YL (Chen, Yulong); Peng, WZ (Peng, Wenzhi); Zhang, JC (Zhang, Jiachen); Pan, HL (Pan, Haolin); Yu, XH (Yu, Xuhao); Liu, Z (Liu, Zheng); Gao, Y (Gao, Yang); Niu, Q (Niu, Qian); Xu, Z (Xu, Zhian); Yang, HT (Yang, Hongtao); Guo, YF (Guo, Yanfeng); Hou, DZ (Hou, Dazhi)

Source: NATIONAL SCIENCE REVIEW  DOI: 10.1093/nsr/nwad308  Early Access Date: DEC 2023   

Abstract: Magnetic structure plays a pivotal role in the functionality of antiferromagnets (AFMs), which not only can be employed to encode digital data but also yields novel phenomena. Despite its growing significance, visualizing the antiferromagnetic domain structure remains a challenge, particularly for non-collinear AFMs. Currently, the observation of magnetic domains in non-collinear antiferromagnetic materials is feasible only in Mn3Sn, underscoring the limitations of existing techniques that necessitate distinct methods for in-plane and out-of-plane magnetic domain imaging. In this study, we present a versatile method for imaging the antiferromagnetic domain structure in a series of non-collinear antiferromagnetic materials by utilizing the anomalous Ettingshausen effect (AEE), which resolves both the magnetic octupole moments parallel and perpendicular to the sample surface. Temperature modulation due to AEE originating from different magnetic domains is measured by lock-in thermography, revealing distinct behaviors of octupole domains in different antiferromagnets. This work delivers an efficient technique for the visualization of magnetic domains in non-collinear AFMs, which enables comprehensive study of the magnetization process at the microscopic level and paves the way for potential advancements in applications.
Infrared imaging employing the anomalous Ettingshausen effect unveils magnetic domain structures in non-collinear antiferromagnets, unlocking new possibilities in spintronics and memory device development.

Accession Number: WOS:001180128900001

ISSN: 2095-5138

eISSN: 2053-714X

Record 18 of 362

Title: Research on 2D Image Motion Compensation for a Wide-Field Scanning Imaging System with Moving Base

Author(s): Chang, SS (Chang, Sansan); Chen, WN (Chen, Weining); Cao, JZ (Cao, Jianzhong); Mei, C (Mei, Chao); Li, X (Li, Xiang); Zhang, HW (Zhang, Hongwei)

Source: PHOTONICS  Volume: 10  Issue: 12  Article Number: 1305  DOI: 10.3390/photonics10121305  Published: DEC 2023  

Abstract: The wide-field imaging system carried on a high-altitude or near-space vehicle takes high-resolution images of the ground to measure and map targets. With the improvement of imaging resolution and measurement accuracy, the focal length of the wide-field imaging system is getting longer. The requirement for image motion compensation (IMC) accuracy is getting higher, and the influence of optical path coupling is increasing within the process of two-dimensional (2D) IMC. To further improve the IMC accuracy of the wide-field imaging system, an innovative IMC method is first proposed in this paper. The method is based on the 2D motion of the scanning platform and secondary mirror. Secondly, to solve the optical coupling problem in the process of 2D IMC, the coupling phenomenon is analyzed. The coupling relationships between 2D scanning motion, 2D secondary mirror motion and image motion is derived from the compensation process. A complete 2D IMC model is established, and a 2D IMC method, including an optical path decoupling correct regulator (ODCR), is designed. Finally, the method is verified in laboratory and field flight tests. The results show that the proposed method can effectively correct the coupling error of the optical path in the process of IMC and achieve high-resolution 2D IMC. When the scanning speed is 60 degrees/s and the exposure time is 2 ms, the accuracy of the 2D IMC is up to 0.57pixels (RMS) in the pitch direction, and 0.46 pixels (RMS) in the roll direction.

Accession Number: WOS:001130523400001

eISSN: 2304-6732

Record 19 of 362

Title: Real-Time Underwater Acoustic Homing Weapon Target Recognition Based on a Stacking Technique of Ensemble Learning

Author(s): Deng, JJ (Deng, Jianjing); Yang, XF (Yang, Xiangfeng); Liu, LW (Liu, Liwen); Shi, L (Shi, Lei); Li, YS (Li, Yongsheng); Yang, YC (Yang, Yunchuan)

Source: JOURNAL OF MARINE SCIENCE AND ENGINEERING  Volume: 11  Issue: 12  Article Number: 2305  DOI: 10.3390/jmse11122305  Published: DEC 2023  

Abstract: Underwater acoustic homing weapons (UAHWs) are formidable underwater weapons with the capability to detect, identify, and rapidly engage targets. Swift and precise target identification is crucial for the successful engagement of targets via UAHWs. This study presents a real-time target recognition method for UAHWs based on stacking ensemble technology. UAHWs emit active broadband detection signals that manifest distinct reflection characteristics on the target. Consequently, we have extracted energy and spatial distribution features from the target's broadband correlation detection output. To address the problem of imbalanced original sea trial data, we employed the SMOTE algorithm to generate a relatively balanced dataset. Then, we established a stacking ensemble model and performed training and testing on both the original dataset and relatively balanced dataset separately. In conclusion, we deployed the stacking ensemble model on an embedded system. The proposed method was validated using real underwater acoustic homing weapon sea trial data. The experiment utilized 5-fold cross-validation. The results indicate that the method presented in this study achieved an average accuracy of 93.3%, surpassing that of individual classifiers. The model's single-cycle inference time was 15 ms, meeting real-time requirements.

Accession Number: WOS:001131298300001

eISSN: 2077-1312

Record 20 of 362

Title: Finite-Time Tracking Control of a Flexible Link Manipulator Based on an Extended State Observer

Author(s): Jing, F (Jing, Feng); Ma, CW (Ma, Caiwen); Xie, ML (Xie, Meilin); Wang, F (Wang, Fan); Cao, Y (Cao, Yu); Fan, X (Fan, Xiao)

Source: APPLIED SCIENCES-BASEL  Volume: 13  Issue: 24  Article Number: 13303  DOI: 10.3390/app132413303  Published: DEC 2023  

Abstract: In this paper, the finite-time trajectory tracking control problem of a flexible link manipulator (FLM) system with unknown parameters is investigated in joint space. An adaptive nonsingular terminal sliding mode (ANTSM) controller based on an extended state observer (ESO) is proposed to ensure that the tracking error converges to a small neighborhood of zero. Firstly, an adaptive ESO is introduced, which is used to estimate unknown system parameters, including the unknown rigid-flexible coupling coefficient and the unknown control gain. Then, an ESO based on the parameters estimated above is proposed to estimate the unmodeled dynamics and external disturbances of the system in real-time. Finally, an ANTSM controller based on ESO is studied to achieve finite-time trajectory tracking control and vibration suppression without any prior knowledge of system uncertainties and external disturbances. The finite-time convergence ability of the closed-loop system is proved by Lyapunov theory. Experimental results on the Quanser Flexible Link System verify the effectiveness of the proposed controller.

Accession Number: WOS:001136043900001

eISSN: 2076-3417

Record 21 of 362

Title: C- and L-Bands Wavelength-Tunable Mode-Locked Fiber Laser

Author(s): Lang, JJ (Lang, Jiajing); Chen, C (Chen, Cheng); Zhang, P (Zhang, Pu); Qi, M (Qi, Mei); Chen, HW (Chen, Haowei)

Source: PHOTONICS  Volume: 10  Issue: 12  Article Number: 1379  DOI: 10.3390/photonics10121379  Published: DEC 2023  

Abstract: We report a single-wavelength tunable mode-locked fiber laser. The single wavelength can be tuned from 1537.49 nm to 1608.06 nm by introducing a Sagnac loop filter. As far as we know, this is the widest single-wavelength tuning range achieved in an erbium-doped mode-locked all-fiber laser based on nonlinear amplifying loop mirror (NALM). The laser's pulse width changes from 549 fs to 808 fs throughout the tuning process, the maximum average output power is 5.72 mW, and the single-pulse energy is 0.34 nJ at a central wavelength of 1556.53 nm. This laser source can serve as an efficient tool for applications that require a broad tunability range. The combination of femtosecond pulses and extensive wavelength tuning capabilities makes this laser system highly valuable in fields such as fiber optic communications, spectroscopy, sensing, and other applications that benefit from ultrafast and tunable laser sources.

Accession Number: WOS:001131331600001

Author Identifiers:

eISSN: 2304-6732

Record 22 of 362

Title: Analysis and Design of Infrared Search and Track System with Afocal Zoom Telescope

Author(s): Qu, R (Qu, Rui); Zhang, HW (Zhang, Hongwei); Yang, L (Yang, Lei); Chen, WN (Chen, Weining)

Source: APPLIED SCIENCES-BASEL  Volume: 13  Issue: 24  Article Number: 13132  DOI: 10.3390/app132413132  Published: DEC 2023  

Abstract: The infrared search and track system (IRST) is a type of special electrical optical (EO) system that can be used in various scenarios to fulfill situation awareness, reconnaissance, and tracking of targets. We proposed a homogeneous coordinate transformation method to analyze the residual image wandering induced by the rotation of the scanning platform and the compensation fast steering mirror and help with the commonly trivial selection of the telescope magnification and the objective focal length. The analysis and simulation are carried out with specified IRST optics, which adopt a 640 x 512 array and 15 mu m pitch detector, in a focal range of 60 mm similar to 360 mm, and a scan speed of 360(circle)/s to 60(circle) /s at 50 fps, and optical specifications are determined further. The presented optical system, with only three kinds of common infrared materials, works at 3.7 mu m similar to 4.8 mu m, demonstrates good image performance and tolerance characteristics, and shows potential in manufacturing. Also, the resulting image wandering of 8 mu m, less than a 0.6-pixel size, at an integral time of 16 ms, proves the correctness of the method and makes the scheme of considerable interest for electrical optical systems.

Accession Number: WOS:001131501100001

eISSN: 2076-3417

Record 23 of 362

Title: Optimizing the Accuracy of Microcomb-Based Microwave Photonic Transversal Signal Processors

Author(s): Sun, Y (Sun, Yang); Wu, JY (Wu, Jiayang); Li, Y (Li, Yang); Xu, XY (Xu, Xingyuan); Ren, GH (Ren, Guanghui); Tan, MX (Tan, Mengxi); Chu, ST (Chu, Sai Tak); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY  Volume: 41  Issue: 23  Pages: 7223-7237  DOI: 10.1109/JLT.2023.3314526  Published: DEC 1 2023  

Abstract: Microwave photonic (MWP) transversal signal processors offer a compelling solution for realizing versatile high-speed information processing by combining the advantages of reconfigurable electrical digital signal processing and high-bandwidth photonic processing. With the capability of generating a number of discrete wavelengths from micro-scale resonators, optical microcombs are powerful multi-wavelength sources for implementing MWP transversal signal processors with significantly reduced size, power consumption, and complexity. By using microcomb-based MWP transversal signal processors, a diverse range of signal processing functions have been demonstrated recently. In this article, we provide a detailed analysis for the processing inaccuracy that is induced by the imperfect response of experimental components. First, we investigate the errors arising from different sources including imperfections in the microcombs, the chirp of electro-optic modulators, chromatic dispersion of the dispersive module, shaping errors of the optical spectral shapers, and noise of the photodetector. Next, we provide a global picture quantifying the impact of different error sources on the overall system performance. Finally, we introduce feedback control to compensate the errors caused by experimental imperfections and achieve significantly improved accuracy. These results provide a guide for optimizing the accuracy of microcomb-based MWP transversal signal processors.

Accession Number: WOS:001122526000027

Author Identifiers:

ISSN: 0733-8724

eISSN: 1558-2213

Record 24 of 362

Title: Optical remote imaging via Fourier ptychography

Author(s): Tian, ZM (Tian, Zhiming); Zhao, M (Zhao, Ming); Yang, D (Yang, Dong); Wang, S (Wang, Sen); Pan, A (Pan, An)

Source: PHOTONICS RESEARCH  Volume: 11  Issue: 12  Pages: 2072-2083  DOI: 10.1364/PRJ.493938  Published: DEC 1 2023  

Abstract: Combining the synthetic aperture radar (SAR) with the optical phase recovery, Fourier ptychography (FP) can be a promising technique for high-resolution optical remote imaging. However, there are still two issues that need to be addressed. First, the multi-angle coherent model of FP would be destroyed by the diffuse object; whether it can improve the resolution or just suppress the speckle is unclear. Second, the imaging distance is in meter scale and the diameter of field of view (FOV) is around centimeter scale, which greatly limits the application. In this paper, the reasons for the limitation of distance and FOV are analyzed, which mainly lie in the illumination scheme. We report a spherical wave illumination scheme and its algorithm to obtain larger FOV and longer distance. A noise suppression algorithm is reported to improve the reconstruction quality. The theoretical interpretation of our system under random phase is given. It is confirmed that FP can improve the resolution to the theoretical limit of the virtual synthetic aperture rather than simply suppressing the speckle. A 10 m standoff distance experiment with a six-fold synthetic aperture up to 31 mm over an object of size similar to 1 m x 0.7 m is demonstrated. (c) 2023 Chinese Laser Press

Accession Number: WOS:001124384300005

Author Identifiers:

ISSN: 2327-9125

Record 25 of 362

Title: Enhanced terahertz wave generation in air-plasma induced by femtosecond three-color harmonic pulses

Author(s): Wang, HQ (Wang, Han-Qi); Fan, WH (Fan, Wen-Hui); Chen, X (Chen, Xu); Yan, H (Yan, Hui)

Source: JOURNAL OF INFRARED AND MILLIMETER WAVES  Volume: 42  Issue: 6  Pages: 780-788  DOI: 10.11972/j.issn.1001-9014.2023.06.011  Published: DEC 2023  

Abstract: The generation of terahertz waves from air-plasma induced by femtosecond three-color harmonic pulses with a frequency ratio of 1:2:m (m is a positive integer), based on the transient photocurrent model and the sawtooth-like electric field formed via multi-color harmonic pulses superposition, has been theoretically investigated. It can be seen that when the air is saturated ionized and the electron density reaches the same maximum, for the same number of harmonic pulses, terahertz conversion efficiency is not always higher when the electric field shape in the composed pulse envelope is closer to a sawtooth waveform and more asymmetric. Besides, the specific wavelength combination schemes of femtosecond three-color harmonic pulses with the frequency ratios of 1: 2:3 and 1:2:4 have also been simulated, which can significantly enhance the generation of terahertz waves, and are realized by adding only a set of optical parametric amplifiers on the basis of the conventional two-color laser pulse case at the frequency ratio of 1:2. Our study will be helpful to obtain intense terahertz sources and provide guidance for experimental operations.

Accession Number: WOS:001134649300007

ISSN: 1001-9014

Record 26 of 362

Title: High-Flux Fast Photon-Counting 3D Imaging Based on Empirical Depth Error Correction

Author(s): Wang, XF (Wang, Xiaofang); Zhang, TY (Zhang, Tongyi); Kang, Y (Kang, Yan); Li, WW (Li, Weiwei); Liang, JT (Liang, Jintao)

Source: PHOTONICS  Volume: 10  Issue: 12  Article Number: 1304  DOI: 10.3390/photonics10121304  Published: DEC 2023  

Abstract: The time-correlated single-photon-counting (TCSPC) three-dimensional (3D) imaging lidar system has broad application prospects in the field of low-light 3D imaging because of its single-photon detection sensitivity and picoseconds temporal resolution. However, conventional TCSPC systems always limit the echo photon flux to an ultra-low level to obtain high-accuracy depth images, thus needing to spend amounts of acquisition time to accumulate sufficient photon detection events to form a reliable histogram. When the echo photon flux is increased to medium or even high, the data acquisition time can be shortened, but the photon pile-up effect can seriously distort the photon histogram and cause depth errors. To realize high accuracy TCSPC depth imaging with a shorter acquisition time, we propose a high-flux fast photon-counting 3D imaging method based on empirical depth error correction. First, we derive the photon flux estimation formula and calculate the depth error of our photon-counting lidar under different photon fluxes with experimental data. Then, a function correction model between the depth errors and the number of echo photons is established by numerical fitting. Finally, the function correction model is used to correct depth images at high photon flux with different acquisition times. Experimental results show that the empirical error correction method can shorten the image acquisition time by about one order of magnitude while ensuring a moderate accuracy of the depth image.

Accession Number: WOS:001131457900001

Author Identifiers:

eISSN: 2304-6732

Record 27 of 362

Title: Real-Time Low-Light Imaging in Space Based on the Fusion of Spatial and Frequency Domains

Author(s): Wu, JX (Wu, Jiaxin); Zhang, HF (Zhang, Haifeng); Li, B (Li, Biao); Duan, JX (Duan, Jiaxin); Li, QX (Li, Qianxi); He, ZY (He, Zeyu); Cao, JZ (Cao, Jianzhong); Wang, H (Wang, Hao)

Source: ELECTRONICS  Volume: 12  Issue: 24  Article Number: 5022  DOI: 10.3390/electronics12245022  Published: DEC 2023  

Abstract: Due to the low photon count in space imaging and the performance bottlenecks of edge computing devices, there is a need for a practical low-light imaging solution that maintains satisfactory recovery while offering lower network latency, reduced memory usage, fewer model parameters, and fewer operation counts. Therefore, we propose a real-time deep learning framework for low-light imaging. Leveraging the parallel processing capabilities of the hardware, we perform the parallel processing of the image data from the original sensor across branches with different dimensionalities. The high-dimensional branch conducts high-dimensional feature learning in the spatial domain, while the mid-dimensional and low-dimensional branches perform pixel-level and global feature learning through the fusion of the spatial and frequency domains. This approach ensures a lightweight network model while significantly improving the quality and speed of image recovery. To adaptively adjust the image based on brightness and avoid the loss of detailed pixel feature information, we introduce an adaptive balancing module, thereby greatly enhancing the effectiveness of the model. Finally, through validation on the SID dataset and our own low-light satellite dataset, we demonstrate that this method can significantly improve image recovery speed while ensuring image recovery quality.

Accession Number: WOS:001131463900001

Author Identifiers:

eISSN: 2079-9292

Record 28 of 362

Title: Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

Author(s): Wu, X (Wu, Xiao); Li, XF (Li, Xuefeng); Ren, L (Ren, Li); Liu, HJ (Liu, Hongjun)

Source: OPTICAL ENGINEERING  Volume: 62  Issue: 12  DOI: 10.1117/1.OE.62.12.125103  Published: DEC 1 2023  

Abstract: The optical modulation format conversion scheme of converting star quadrature amplitude modulation signals to four-stage pulse amplitude modulation signals is theoretically realized by combining phase-sensitive amplification in a silicon-p toluene sulphonate hybrid waveguide. By optimizing the waveguide structure, a phase mismatch bandwidth from 1310 to 1890 nm and an ultra-high nonlinear coefficient of 6.966 x 10(3) m(-1) W-1 are obtained. Constellation plots, error vector magnitude, and bit error rate (BER) are used to evaluate the conversion scheme. Simulation results show that the scheme not only ensures the integrity of the signal information before and after conversion but also achieves nearly 12 dB performance improvement in the converted signal with a BER threshold of 10(-3). It is further shown that the scheme has great potential for applications such as long-short distance interconnections and hierarchical modulation of advanced format signals.

Accession Number: WOS:001134884400001

ISSN: 0091-3286

eISSN: 1560-2303

Record 29 of 362

Title: Investigation of the Space-Variance Effect of Imaging Systems with Digital Holography

Author(s): Yang, XY (Yang, Xingyu); Zhao, R (Zhao, Rong); Chen, H (Chen, Huan); Du, YJ (Du, Yijun); Fan, C (Fan, Chen); Zhang, GP (Zhang, Gaopeng); Zhao, ZX (Zhao, Zixin)

Source: PHOTONICS  Volume: 10  Issue: 12  Article Number: 1350  DOI: 10.3390/photonics10121350  Published: DEC 2023  

Abstract: In classical Fourier optics, an optical imaging system is regarded as a linear space-invariant system, which is only an approximation. Especially in digital holography, the space-variance effect has a great impact on the image quality and cannot be ignored. Therefore, it is comprehensively investigated in this article. Theoretical analyses indicate that the space-variance effect is caused by linear frequency modulation and ideal low-pass filtering, and it can be divided into three states: the approximate space-invariance state, the high-frequency distortion state, and the boundary-diffraction state. Classical Fourier optics analysis of optical imaging systems only considers the first. Regarding the high-frequency distortion state, the closer the image field is to the edge, the more severe the distortion of high-frequency information is. As for the boundary-diffraction state, in addition to the distortion of high-frequency information in the margin, a prominent boundary-diffraction phenomenon is observed. If the space-variance effect of the imaging lens is ignored, we predict that no space-variance effect in image holography will occur when the hologram is recorded at the back focal plane of the imaging lens. Simulation and experimental results are presented to validate our theoretical prediction.

Accession Number: WOS:001130499200001

eISSN: 2304-6732

Record 30 of 362

Title: Constructing 1D/0D Sb2S3/Cd0.6Zn0.4S S-scheme heterojunction by vapor transport deposition and in-situ hydrothermal strategy towards photoelectrochemical water splitting

Author(s): Liu, DK (Liu, Dekang); Jin, W (Jin, Wei); Zhang, LY (Zhang, Liyuan); Li, QJ (Li, Qiujie); Sun, Q (Sun, Qian); Wang, YS (Wang, Yishan); Hu, XY (Hu, Xiaoyun); Miao, H (Miao, Hui)

Source: JOURNAL OF ALLOYS AND COMPOUNDS  Volume: 975  Article Number: 172926  DOI: 10.1016/j.jallcom.2023.172926  Early Access Date: NOV 2023   Published: FEB 25 2024  

Abstract: Antimony sulfide (Sb2S3) is widely used in photocatalysts and photovoltaic cells because of its abundant reserves, low toxicity, environmental friendliness, narrow band gap, and high light absorption capacity. Sb2S3 shows a quasi-one-dimensional structure composed of [Sb4S6]n nanoribbons, a lot of reported studies are focused on preparing Sb2S3 with [hk1] oriented dominant growth to improve the photogenerated carrier transport capacity of Sb2S3. However, there is relatively few research on the preparation of [hk1] oriented rod-like Sb2S3 by vapor transport deposition (VTD) method. In this work, the VTD method was used to prepare Sb2S3 with [hk1] oriented growth on the FTO substrate, and then composite with the ternary solid solution CdxZn1_xS. Finally, a novel Sb2S3/Cd0.6Zn0.4S S-scheme heterojunction with rod-like core-shell structure was successfully constructed, which could effectively improve the photoelectrochemical properties. Because the solid solution component x is adjustable, that is, CdxZn1_xS has continuously adjustable band gap width and energy level position, the Sb2S3/ CdxZn1_xS heterojunction type can be regulated from Type-II to S-scheme. Photoelectrochemical (PEC) tests indicated that the composite photoanode Sb2S3/Cd0.6Zn0.4S achieved a higher photocurrent density (2.54 mA center dot cm_ 2, 1.23 V vs. RHE), which is about 4.31 times that of pure Sb2S3 nanorod photoanode (0.59 mA center dot cm_ 2, 1.23 V vs. RHE).

Accession Number: WOS:001127814800001

ISSN: 0925-8388

eISSN: 1873-4669

Record 31 of 362

Title: Optical microscopy: advances and applications

Author(s): Dan, D (Dan, Dan)

Source: FRONTIERS IN PHYSICS  Volume: 11  Article Number: 1337300  DOI: 10.3389/fphy.2023.1337300  Published: NOV 27 2023  

Accession Number: WOS:001121930900001

Author Identifiers:

ISSN: 2296-424X

Record 32 of 362

Title: Multilevel-based algorithm for hyperspectral image interpretation

Author(s): Qiu, S (Qiu, Shi); Ye, HP (Ye, Huping); Liao, XH (Liao, Xiaohan); Zhang, BY (Zhang, Benyue); Zhang, M (Zhang, Miao); Zeng, ZM (Zeng, Zimu)

Source: COMPUTERS & ELECTRICAL ENGINEERING  Volume: 113  Article Number: 109033  DOI: 10.1016/j.compeleceng.2023.109033  Early Access Date: NOV 2023   Published: JAN 2024  

Abstract: Hyperspectral imagery contains spatial and spectral information, which can reveal the material properties of the target while intuitively displaying its spatial attributes. It has been applied in target recognition, search and rescue, and other fields. However, manual detection inevitably leads to missed detections and false alarms, necessitating the assistance of artificial intelligence for detection. To address this, we propose the multilevel-based algorithm for hyperspectral image interpretation. 1) From the spatial and spectral dimensions, we propose a semantic segmentation algorithm based on multidimensional information fusion to achieve semantic segmentation. 2) From the semantic and textual representation dimensions, we introduce a context interpretation module based on visual attention. We construct both real and simulated databases to validate the effectiveness of the algorithm. Experimental results demonstrate that the average accuracy of semantic segmentation achieved by the proposed algorithm is 74.3%. Additionally, the BLEU1 score reaches 71.2, outperforming mainstream algorithms by 1.4.

Accession Number: WOS:001126685300001

Author Identifiers:

ISSN: 0045-7906

eISSN: 1879-0755

Record 33 of 362

Title: Observation of three kinds of bound solitons in a black phosphorus-based erbium fiber laser

Author(s): Li, WL (Li, Wenlei); Lin, RP (Lin, Ruping); Chen, GW (Chen, Guangwei); Geng, GL (Geng, Gaoli); Xu, P (Xu, Peng); Yang, YN (Yang, Yining); Wang, XL (Wang, Xinliang); Xu, J (Xu, Jian)

Source: OPTICAL FIBER TECHNOLOGY  Volume: 82  Article Number: 103617  DOI: 10.1016/j.yofte.2023.103617  Early Access Date: NOV 2023   Published: JAN 2024  

Abstract: We describe the experimental finding of three kinds of bound solitons in the Erbium-doped fiber lasers based on saturable absorber of black phosphorus. The passively mode-locked laser can obtain stretched-pulse state, double-pulse and four-pulse bound state with the sech2-shaped pulse profile. The laser can also realize Lorentzian autocorrelation trace with the duration of approximately 562 fs and deliver Lorentzian double-pulse bound state with pulse separations of approximately 5.04 ps by properly adjusting the polarization state. This project demonstrates that the same fiber laser can obtain different types of bound state pulses, which lays a foundation for further research into bound state pulses.

Accession Number: WOS:001127091900001

Author Identifiers:

ISSN: 1068-5200

eISSN: 1095-9912

Record 34 of 362

Title: Influence of wavefront distortion on the measurement of pulse signal-to-noise ratio

Author(s): Xing, DD (Xing, Dingding); Yuan, SC (Yuan, Suochao); Kou, JW (Kou, Jingwei); Da, Z (Da, Zhengshang)

Source: OPTICS COMMUNICATIONS  Volume: 554  Article Number: 130110  DOI: 10.1016/j.optcom.2023.130110  Early Access Date: NOV 2023   Published: MAR 1 2024  

Abstract: The high-fidelity measurement of the ultra-short and ultra-intense laser pulses' temporal signal-to-noise ratio (SNR) is of great significance. To the best of our knowledge, few studies have investigated the influence of wavefront distortion on the measurement of pulse SNR. In this work, a numerical model is constructed to study how wavefront distortion affects the measurement of ultra-short and ultra-intense pulse SNR by the single-shot third-order auto-correlation (TOAC) method. The nonlinear coupled-wave equations with wavefront distortion have been solved numerically by the split-step Fourier method and the fourth-order Runge-Kutta numerical algorithm. The wavefront distortion of the under-test fundamental wave will be transmitted to the second harmonic and third harmonic, leading to the phase mismatch in the second harmonic generation (SHG) and third harmonic generation (THG), further resulting in the deterioration of the measured SNR. We analyze the influence of different spatial frequencies and peak-to-valley (PV) values on the measurements of SNR. The larger the spatial frequency or PV value of the wavefront distortion, the more severe the degradation of the SNR.

Accession Number: WOS:001128009100001

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 35 of 362

Title: Research on spatial frequency shift super-resolution imaging

Author(s): Ling, JZ (Ling, Jin-Zhong); Guo, JK (Guo, Jin-Kun); Wang, YC (Wang, Yu-Cheng); Liu, X (Liu, Xin); Wang, XR (Wang, Xiao-Rui)

Source: ACTA PHYSICA SINICA  Volume: 72  Issue: 22  Article Number: 224202  DOI: 10.7498/aps.72.20230934  Published: NOV 20 2023  

Abstract: In spite of the success of fluorescence microscopes (such as stimulated emission depletion microscopy, stochastic optical reconstruction microscopy and photoactivated localization microscopy) in biomedical field, which have realized nanometer scale imaging resolution and promoted the great development of bio-medicine, the super-resolution imaging method for non-fluorescent sample is still scarce, and the resolution still has a big gap to nanometer scale. Among existing methods, structured illumination microscopy, PSF engineering, super oscillatory lens and microsphere assisted nanoscopy are more mature and widely used. However, limited by the theory itself or engineering practice, the resolutions of these methods are hard to exceed 50 nm, which limits their applications in many fields. Enlightened by synthetic aperture technique, researchers have proposed spatial frequency shift super-resolution microscopy through shifting and combining the spatial frequency spectrum of imaging target, which is a promising super-resolution imaging scheme, for its resolution limit can be broken through continually. Currently, owing to the limitation of the refractive index of optical material, the wavelength of illumination evanescent wave is hard to shorten when this wave is generated at prism surface via total internal reflection, which determines the highest resolution of this spatial frequency shift super-resolution imaging system. Another deficiency of this scheme is the difference in imaging resolution among different directions, for the image has the highest resolution only in the direction along the wave vector of illumination evanescent wave; while, the image has the lowest resolution in the direction perpendicular to the wave vector, which is the same as that obtained by far-field illumination. In order to solve the above thorny questions, a new model of generating the evanescent wave is proposed, which can generates an omnidirectional evanescent wave with arbitrary wavelength based on the phase modulation of nano-structure, and solve the both problem in imaging system at the same time. To verify the our scheme, we set up a complete simulation model for spatial frequency shift imaging scheme, which includes three parts: the generation of evanescent wave and the interaction of the evanescent wave with the nano structures at imaging target, which can be simulated with FDTD algorithm; the propagation of light field from near-field to far-field region, from the sample surface to the focal plane of objective lens, which can be calculated with angular spectrum theory; the propagation of light field from the focal place to the image plane, which can be worked out with Chirp-Z transform. Firstly, with this complete simulation model, we compare the resolution of microscopy illuminated by evanescent wave with that by propagating wave. The experimental results verify the super-resolution imaging ability of evanescent wave illumination and the influence of prism refractive index. The higher the refractive index, the shorter the wavelength of evanescent wave is and the higher the resolution of spatial frequency shift imaging system. Secondly, we demonstrate the resolution difference in a series of directions with a three-bar imaging target rotated to different directions. The result shows that the highest imaging resolution occurs in the direction of illumination evanescent wave vector, and the lowest resolution appears in the direction perpendicular to the wave vector.
Finally, we simulate the evanescent wave generated by nano-strcuture and demonstrate its properties of wavelength and vector direction. When applied to near-field illumination super resolution imaging, the omnidirectional evanescent wave solves the both problems in the model of total internal reflection from the prism surface. Therefore, the advantages of our scheme are higher imaging resolution and faster imaging speed, no need for multi-direction and multiple imaging, and also image post-processing. In this study, a new spatial frequency shift super-resolution imaging method is proposed, which lays a theoretical foundation for its applications.

Accession Number: WOS:001111676700010

Author Identifiers:

ISSN: 1000-3290

Record 36 of 362

Title: A truncated test scheme design method for success-failure in-orbit tests

Author(s): Ding, WZ (Ding, Wenzhe); Bai, X (Bai, Xiang); Wang, QW (Wang, Qingwei); Long, F (Long, Fang); Li, HL (Li, Hailin); Wu, ZR (Wu, Zhengrong); Liu, J (Liu, Jian); Yao, HS (Yao, Huisheng); Yang, H (Yang, Hong)

Source: RELIABILITY ENGINEERING & SYSTEM SAFETY  Volume: 243  Article Number: 109782  DOI: 10.1016/j.ress.2023.109782  Early Access Date: NOV 2023   Published: MAR 2024  

Abstract: Based on the success-failure test feature of in-orbit tests (IOTs) for typical space equipment, this paper presents a method for designing a truncated test scheme for success-failure in-orbit tests. With this method, a small upper boundary of the sample size for the IOT verification test can be obtained before the test starts. The method introduces the truncated Bayes-sequential mesh test (SMT) method into the design of the IOT verification test scheme and greatly compresses the continuous test area by incorporating optimization theory, resulting in a smaller upper limit of the IOT sample size. First, this paper derives a specific calculation formula for the BayesSMT critical line. Second, the Markov chain model is adopted to calculate the occurrence probabilities of each acceptance and rejection point through state transition. Finally, an optimal truncated test optimization algorithm based on the augmented lagrangian genetic algorithm is proposed. Simulation tests show that, compared with the classical single sampling method, the truncated sequential probability ratio test method, the truncated SMT method, and the truncated Bayes-SMT method based on step-by-step calculation, the method presented in this paper can be used to obtain a sequential test scheme with smaller truncated sample size.

Accession Number: WOS:001118808500001

Author Identifiers:

ISSN: 0951-8320

eISSN: 1879-0836

Record 37 of 362

Title: The deactivation effects of Nd3+ion for 2.85 μm laser in Ho3+/Nd3+co-doped fluorotellurite glass

Author(s): Feng, SH (Feng, Shaohua); Zhu, J (Zhu, Jun); Liu, CZ (Liu, Chengzhen); Xiao, Y (Xiao, Yang); Cai, LY (Cai, Liyang); Xu, YT (Xu, Yantao); Xiao, XS (Xiao, Xusheng); Guo, HT (Guo, Haitao)

Source: JOURNAL OF LUMINESCENCE  Volume: 266  Article Number: 120308  DOI: 10.1016/j.jlumin.2023.120308  Early Access Date: NOV 2023   Published: FEB 2024  

Abstract: The 2.85 mu m band has garnered significant attention for its wide range of applications in the mid-infrared region, and Ho3+ doped fluorotellurite fiber shows great promise as a gain medium for the 2.85 mu m fiber laser. To achieve efficient population inversion for Ho3+ ions at 2.85 mu m, Ho3+/Nd3+ co-doped fluorotellurite glasses with low hydroxyl were synthesized. The deactivation effect of Nd3+ ions to Ho3+: 5I7 levels was investigated through emission spectra and lifetime decay curves under 890 nm excitation. The results show that Nd3+ ions can effectively quench the Ho3+: 2.05 mu m emission and help the Ho3+: 5I6 -> 5I7 transition to overcome the bottleneck of particle population inversion. Ultimately, the particle population inversion corresponding to 2.85 mu m luminescence was realized in the Ho3+/Nd3+ co-doped fluorotellurite glass, and indicates that a maximum of 1.64 W laser at 2.85 mu m with a slope efficiency of 8.72 % can be realized under 890 nm pump by numerical simulations.

Accession Number: WOS:001166707300001

ISSN: 0022-2313

eISSN: 1872-7883

Record 38 of 362

Title: On-orbit space optical communication demonstration with a 22 s acquisition time

Author(s): Wang, X (Wang, Xuan); Han, JF (Han, Junfeng); Cui, K (Cui, Kai); Wang, C (Wang, Chen); Xie, ML (Xie, Meilin); Meng, XS (Meng, Xiangsheng); Chang, ZY (Chang, Zhiyuan)

Source: OPTICS LETTERS  Volume: 48  Issue: 22  Pages: 5980-5983  DOI: 10.1364/OL.505966  Published: NOV 15 2023  

Abstract: The inherent small divergence angle of space optical communication poses significant challenges to establishing communication links. Therefore, laser link acquisition becomes a crucial technology in optical communication, with a primary focus on reducing the acquisition time effectively. Conventional optical communication acquisition techniques fail to address the error effects caused by satellite insertion into the Earth orbit, thus unable to meet the rapid establishment demands of laser links in satellite optical communication networks. In this regard, we propose a novel, to the best of our knowledge, on-orbit calibration method for laser communication terminals to our knowledge. Leveraging stellar observations, this method achieves efficient on-orbit calibration with only a single observation. Theoretical analysis and on-orbit experimental results demonstrate that this approach effectively enhances an open-loop pointing accuracy, offering promising prospects for achieving a rapid establishment of optical communication links in ultra-long-distance optical communication missions. (c) 2023 Optica Publishing Group

Accession Number: WOS:001110354000003

PubMed ID: 37966768

ISSN: 0146-9592

eISSN: 1539-4794

Record 39 of 362

Title: A compact 51.6-W, 26-μ J, Yb-doped all-fiber integrated CPA system through quasi-rectangular pulse pre-shaping

Author(s): Li, QL (Li, Qianglong); Li, F (Li, Feng); Liu, HJ (Liu, Hongjun); Zhao, W (Zhao, Wei); Zhao, HL (Zhao, Hualong); Wang, YS (Wang, Yishan); Wen, WL (Wen, Wenlong); Cao, X (Cao, Xue); Si, JH (Si, Jinhai)

Source: OPTICS AND LASER TECHNOLOGY  Volume: 170  Article Number: 110300  DOI: 10.1016/j.optlastec.2023.110300  Early Access Date: NOV 2023   Published: MAR 2024  

Abstract: A compact 51.6-W, 26-mu J all-fiber integrated Yb-doped femtosecond laser source with pulse durations of 692 fs despite similar to 18 pi nonlinear phase shift accumulation in the main amplifier is demonstrated by using fiber quasi-rectangular pulse pre-shaping. The numerical results are in good agreement with the experiment. Due to the advantages of an all-fiber spliced structure and a minimal pulse stretching ratio (from 26.3 ps to similar to 70 ps), just a small size of gratings and a short separation distance between the two gratings in the compressor is required. Therefore, the laser source is exceedingly compact, robust, cost-effective, and easy to assemble. This technique is anticipated to accelerate the use of fiber femtosecond lasers in industrial applications.

Accession Number: WOS:001113391800001

Author Identifiers:

ISSN: 0030-3992

eISSN: 1879-2545

Record 40 of 362

Title: High-aspect-ratio dielectric pillar with nanocavity backed by metal substrate in the infrared range

Author(s): Lu, XY (Lu, Xiaoyuan); Tognazzi, A (Tognazzi, Andrea); Cino, AC (Cino, Alfonso C.); De Angelis, C (De Angelis, Costantino); Xu, G (Xu, Gang); Zhang, TY (Zhang, Tongyi); Shishmarev, D (Shishmarev, Dmitry)

Source: OPTICS EXPRESS  Volume: 31  Issue: 23  Pages: 39213-39221  DOI: 10.1364/OE.506208  Published: NOV 6 2023  

Abstract: We investigated absorption and field enhancements of shallow nanocavities on top of high-aspect-ratio dielectric pillars in the infrared range. The structure includes a high-aspect-ratio nanopillar array of high refractive index, with nano-cavities on top of the pillars, and a metal plane at the bottom. The enhancement factor of electric field intensity reaches 3180 in the nanocavities and peak absorption reaches 99%. We also investigated the finite-size effect of the presented structure to simulate real experiments. Due to its narrow absorption bandwidth 3.5 nm, it can work as a refractive index sensor with sensitivity 297.5 nm/RIU and figure of merit 85. This paves the way to directly control light field at the nanoscales in the infrared light range. The investigated nanostructure will find applications in multifunctional photonics devices such as chips for culturing cells, refractive index sensors, biosensors of single molecule detection and nonlinear sensors.

Accession Number: WOS:001108059000002

PubMed ID: 38018005

Author Identifiers:

ISSN: 1094-4087

Record 41 of 362

Title: Particle aggregation/disaggregation and sorting using woven spiral beams

Author(s): Tai, YP (Tai, Y. P.); Wei, WJ (Wei, W. J.); Zhang, H (Zhang, H.); Ma, HX (Ma, H. X.); Li, XZ (Li, X. Z.)

Source: APPLIED PHYSICS LETTERS  Volume: 123  Issue: 19  Article Number: 191109  DOI: 10.1063/5.0180252  Published: NOV 6 2023  

Abstract: Spiral beams (SBs) have attracted increasing attention in structured light fields owing to their chirality and rich modes. However, the wrench force of existing SBs is uncontrollable and nonadjustable, which greatly limits the complex applications of particle manipulation. To address this issue, we proposed a woven spiral beam (WSB) with a controllable force field. The WSB was constructed by reshaping multispiral beams woven through an SB. The proposed WSB has flexible adjustable intensity lobes, which are easy to modulate independently, including size, position, helicity, and phase gradient. Furthermore, the WSBs were used to experimentally execute important particle manipulations, such as aggregation/disaggregation and sorting. This study provides an alternative scheme for the functional applications of SBs, which leads to different application scenarios in optical manipulations.

Accession Number: WOS:001100875900003

Author Identifiers:

ISSN: 0003-6951

eISSN: 1077-3118

Record 42 of 362

Title: Laser induced spherical bubble dynamics in partially confined geometry with acoustic feedback from container walls

Author(s): Fu, L (Fu, Lei); Liang, XX (Liang, Xiao-Xuan); Wang, SJ (Wang, Sijia); Wang, SQ (Wang, Siqi); Wang, P (Wang, Ping); Zhang, ZX (Zhang, Zhenxi); Wang, J (Wang, Jing); Vogel, A (Vogel, Alfred); Yao, CP (Yao, Cuiping)

Source: ULTRASONICS SONOCHEMISTRY  Volume: 101  Article Number: 106664  DOI: 10.1016/j.ultsonch.2023.106664  Early Access Date: NOV 2023   Published: DEC 2023  

Abstract: We investigated laser-induced cavitation dynamics in a small container with elastic thin walls and free or partially confined surface both experimentally and by numerical investigations. The cuvette was only 8-25 times larger than the bubble in its center. The liquid surface was either free, or two thirds were confined by a pistonshaped pressure transducer. Different degrees of confinement were realized by filling the liquid up to the transducer surface or to the top of the cuvette. For reference, some experiments were performed in free liquid. We recorded the bubble dynamics simultaneously by high-speed photography, acoustic measurements, and detection of probe beam scattering. Simultaneous single-shot recording of radius-time curves and oscillation times enabled to perform detailed investigations of the bubble dynamics as a function of bubble size, acoustic feedback from the elastic walls, and degree of surface confinement. The bubble dynamics was numerically simulated using a Rayleigh-Plesset model extended by terms describing the acoustically mediated feedback from the bubble's environment.Bubble oscillations were approximately spherical as long as no secondary cavitation by tensile stress occurred. Bubble expansion was always similar to the dynamics in free liquid, and the environment influenced mainly the collapse phase and subsequent oscillations. For large bubbles, strong confinement led to a slight reduction of maximum bubble size and to a pronounced reduction of the oscillation time, and both effects increased with bubble size. The joint action of breakdown-induced shock wave and bubble expansion excites cuvette wall vibrations, which produce alternating pressure waves that are focused onto the bubble. This results in a prolongation of the collapse phase and an enlargement of the second oscillation, or in time-delayed re-oscillations. The details of the bubble dynamics depend in a complex manner on the degree of surface confinement and on bubble size. Numerical simulations of the first bubble oscillation agreed well with experimental data. They suggest that the alternating rarefaction/compression waves from breakdown-induced wall vibrations cause a prolongation of the first oscillation. By contrast, liquid mass movement in the cuvette corners result in wall vibrations causing late re-oscillations. The strong and rich interaction between the bubble and its surroundings may be relevant for a variety of applications such as intraluminal laser surgery and laser-induced cavitation in microfluidics.

Accession Number: WOS:001110645000001

PubMed ID: 37931344

Author Identifiers:

ISSN: 1350-4177

eISSN: 1873-2828

Record 43 of 362

Title: Static spectroscopic ellipsometer based on division-of-amplitude polarization demodulation

Author(s): Li, SY (Li, Siyuan); Deng, ZX (Deng, Zhongxun); Quan, NC (Quan, Naicheng); Zhang, CM (Zhang, Chunmin)

Source: OPTICS COMMUNICATIONS  Volume: 552  Article Number: 130115  DOI: 10.1016/j.optcom.2023.130115  Early Access Date: NOV 2023   Published: FEB 1 2024  

Abstract: Theoretical and experimental demonstrations of a static spectroscopic ellipsometer are presented. It uses a linear polarizer for generating polarization states to interact with the sample, and three non-polarization beam splitters incorporating four achromatic quarter waveplate/linear analyzer pairs for analyzing the polarization states after the interaction. Compared to previous instruments, the most significant advantage of the described model is that it can obtain the spectral ellipsometric parameters with the same spectral resolution as the spectrometer in the system by a single snapshot.

Accession Number: WOS:001110587300001

ISSN: 0030-4018

eISSN: 1873-0310

Record 44 of 362

Title: Improvement of the sediment flux estimation in the Yangtze River Estuary with a GOCI data adjusted numerical model

Author(s): Xie, GH (Xie, Guohu); Zhang, Y (Zhang, Yang); Liu, J (Liu, Jia); Xue, HJ (Xue, Huijie); Ge, JZ (Ge, Jianzhong); He, XQ (He, Xianqiang); Ma, WT (Ma, Wentao); Chai, F (Chai, Fei)

Source: OCEAN MODELLING  Volume: 186  Article Number: 102284  DOI: 10.1016/j.ocemod.2023.102284  Early Access Date: NOV 2023   Published: DEC 2023  

Abstract: Sediment flux (SF) in the estuary is vital to the coastal and estuarine environment, especially the morphodynamical and ecological processes. However, its quantitative estimation with high accuracy is difficult because it is controlled by complex mechanisms and multiple processes. This study corrects the seasonal variations of the simulated suspended sediment concentration (SSC) by using GOCI-derived surface SSC and calculates the variations of SFs at the main cross-sections in and out of the Yangtze River Estuary (YRE). The results show that in 2013, 159 Mt and 143 Mt of sediments passed through Xuliujing hydrological station in YRE and estuarine mouth section, respectively. In the inner estuary, the significant seasonal variations of sediment transport are noted that the most seaward transport happens in summer (43.8%) and the least occurs in winter (7.3%). In the outer estuary, the southward transport towards Hangzhou Bay is the most critical pathway, accounting for 109.0% of total transport at mouth section, and is prevalent in autumn and winter. With considerations of sand mining and land reclamation, obviously erosions appear in the whole estuary during both 2013 and 2015. With stronger wind conditions in 2013, severer erosion (161 Mt) happens in outer estuary than that in 2015 (86 Mt). By combining the GOCI-derived surface SSC and the numerical model results, this study can better represent high -frequency hydro-and sediment-dynamical processes to calculate the annual, seasonal, and vertical SFs with improved accuracy. Hence this method may provide a viable way to infer locally averaged morphological changes.

Accession Number: WOS:001108274500001

ISSN: 1463-5003

eISSN: 1463-5011

Record 45 of 362

Title: Identity Feature Disentanglement for Visible-Infrared Person Re-Identification

Author(s): Chen, XM (Chen, Xiumei); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang)

Source: ACM TRANSACTIONS ON MULTIMEDIA COMPUTING COMMUNICATIONS AND APPLICATIONS  Volume: 19  Issue: 6  Article Number: 201  DOI: 10.1145/3595183  Published: NOV 2023  

Abstract: Visible-infrared person re-identification (VI-ReID) task aims to retrieve persons from different spectrum cameras (i.e., visible and infrared images). The biggest challenge of VI-ReID is the huge cross-modal discrepancy caused by different imaging mechanisms. Many VI-ReID methods have been proposed by embedding different modal person images into a shared feature space to narrow the cross-modal discrepancy. However, these methods ignore the purification of identity features, which results in identity features containing different modal information and failing to align well. In this article, an identity feature disentanglement method is proposed to disentangle the identity features from identity-irrelevant information, such as pose and modality. Specifically, images of different modalities are first processed to extract shared features that reduce the cross-modal discrepancy preliminarily. Then the extracted feature of each image is disentangled into a latent identity variable and an identity-irrelevant variable. In order to enforce the latent identity variable to contain as much identity information as possible and as little identity-irrelevant information, an ID-discriminative loss and an ID-swapping reconstruction process are additionally designed. Extensive quantitative and qualitative experiments on two popular public VI-ReID datasets, RegDB and SYSU-MM01, demonstrate the efficacy and superiority of the proposed method.

Accession Number: WOS:001035785200024

Author Identifiers:

ISSN: 1551-6857

eISSN: 1551-6865

Record 46 of 362

Title: Design and Analysis of Photon Imaging Detector Based on Printed Circult Board Technology Cross Strip Anode

Author(s): Duan, JY (Duan, Jinyao); Zheng, JK (Zheng, Jinkun); Yang, Y (Yang, Yang); Song, YC (Song, Yuchao); La, A (La, Anpeng); Bai, YL (Bai, Yonglin); Chow, CW (Chow, Chi-Wai)

Source: APPLIED SCIENCES-BASEL  Volume: 13  Issue: 22  Article Number: 12304  DOI: 10.3390/app132212304  Published: NOV 2023  

Abstract: Detectors with cross strip (XS) anodes have high application value in deep space exploration, quantum communications, space astronomical telescopes, etc. In this article, a single-layer XS anode based on Printed Circult Board (PCB) technology is proposed, which can conveniently realize large-area array detection with a simple process and low cost. We theoretically studied the electron motion principle and equivalent model of the XS anode and established a model of the XS anode through the finite element method. The model allows us to determine the anode geometry, such as anode strip width, inter-strip distance, and substrate thickness, to optimize the output signal on the XS anode, thereby indirectly affecting the resolution of the detector. The optimal parameters of the detector were processed with the help of our model, such as a strip width of 110 mu m, strip spacing of 550 mu m, and substrate thickness of 150 mu m. The model shows that the strip charge collection ratio is 1:1. Comparing model predictions with experimental measurements reveals key parameters, such as the manufacturing is convenient and simple and can provide some ideas for subsequent large-area array detector imaging.

Accession Number: WOS:001120622400001

Author Identifiers:

eISSN: 2076-3417

Record 47 of 362

Title: Polarization-multiplexed metasurface enabled tri-functional imaging

Author(s): Ge, SY (Ge, Suyang); Li, XY (Li, Xingyi); Liu, ZL (Liu, Zilei); Zhao, JQ (Zhao, Jiaqi); Wang, WJ (Wang, Wanjun); Li, SQ (Li, Siqi); Zhang, WF (Zhang, Wenfu)

Source: OPTICS LETTERS  Volume: 48  Issue: 21  Pages: 5683-5686  DOI: 10.1364/OL.502632  Published: NOV 1 2023  

Abstract: Diffraction-limited focusing imaging, edge-enhanced imag-ing, and long depth of focus imaging offer crucial technical capabilities for applications such as biological microscopy and surface topography detection. To conveniently and quickly realize the microscopy imaging of different func-tions, the multifunctional integrated system of microscopy imaging has become an increasingly important research direction. However, conventional microscopes necessitate bulky optical components to switch between these func-tionalities, suffering from the system's complexity and unstability. Hence, solving the problem of integrating mul-tiple functions within an optical system is a pressing need. In this work, we present an approach using a polarization -multiplexed tri-functional metasurface, capable of realizing the aforementioned imaging functions simply by changing the polarization state of the input and output light, enhanc-ing the system structure's compactness and flexibility. This work offers a new avenue for multifunctional imaging, with potential applications in biomedicine and microscopy imag-ing. (c) 2023 Optica Publishing Group

Accession Number: WOS:001116546500012

PubMed ID: 37910733

Author Identifiers:

ISSN: 0146-9592

eISSN: 1539-4794

Record 48 of 362

Title: Processing Accuracy of Microcomb-Based Microwave Photonic Signal Processors for Different Input Signal Waveforms

Author(s): Li, Y (Li, Yang); Sun, Y (Sun, Yang); Wu, JY (Wu, Jiayang); Ren, GH (Ren, Guanghui); Corcoran, B (Corcoran, Bill); Xu, XY (Xu, Xingyuan); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent. E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)

Source: PHOTONICS  Volume: 10  Issue: 11  Article Number: 1283  DOI: 10.3390/photonics10111283  Published: NOV 2023  

Abstract: Microwave photonic (MWP) signal processors, which process microwave signals based on photonic technologies, bring advantages intrinsic to photonics such as low loss, large processing bandwidth, and strong immunity to electromagnetic interference. Optical microcombs can offer a large number of wavelength channels and compact device footprints, which make them powerful multi-wavelength sources for MWP signal processors to realize a variety of processing functions. In this paper, we experimentally demonstrate the capability of microcomb-based MWP signal processors to handle diverse input signal waveforms. In addition, we quantify the processing accuracy for different input signal waveforms, including Gaussian, triangle, parabolic, super Gaussian, and nearly square waveforms. Finally, we analyse the factors contributing to the difference in the processing accuracy among the different input waveforms, and our theoretical analysis well elucidates the experimental results. These results provide guidance for microcomb-based MWP signal processors when processing microwave signals of various waveforms.

Accession Number: WOS:001118141600001

Author Identifiers:

eISSN: 2304-6732

Record 49 of 362

Title: Lensless Image Restoration Based on Multi-Stage Deep Neural Networks and Pix2pix Architecture

Author(s): Liu, MY (Liu, Muyuan); Su, XQ (Su, Xiuqin); Yao, XP (Yao, Xiaopeng); Hao, W (Hao, Wei); Zhu, WH (Zhu, Wenhua)

Source: PHOTONICS  Volume: 10  Issue: 11  Article Number: 1274  DOI: 10.3390/photonics10111274  Published: NOV 2023  

Abstract: Lensless imaging represents a significant advancement in imaging technology, offering unique benefits over traditional optical systems due to its compact form factor, ideal for applications within the Internet of Things (IoT) ecosystem. Despite its potential, the intensive computational requirements of current lensless imaging reconstruction algorithms pose a challenge, often exceeding the resource constraints typical of IoT devices. To meet this challenge, a novel approach is introduced, merging multi-level image restoration with the pix2pix generative adversarial network architecture within the lensless imaging sphere. Building on the foundation provided by U-Net, a Multi-level Attention-based Lensless Image Restoration Network (MARN) is introduced to further augment the generator's capabilities. In this methodology, images reconstructed through Tikhonov regularization are perceived as degraded images, forming the foundation for further refinement via the Pix2pix network. This process is enhanced by incorporating an attention-focused mechanism in the encoder--decoder structure and by implementing stage-wise supervised training within the deep convolutional network, contributing markedly to the improvement of the final image quality. Through detailed comparative evaluations, the superiority of the introduced method is affirmed, outperforming existing techniques and underscoring its suitability for addressing the computational challenges in lensless imaging within IoT environments. This method can produce excellent lensless image reconstructions when sufficient computational resources are available, and it consistently delivers optimal results across varying computational resource constraints. This algorithm enhances the applicability of lensless imaging in applications such as the Internet of Things, providing higher-quality image acquisition and processing capabilities for these domains.

Accession Number: WOS:001118429000001

eISSN: 2304-6732

Record 50 of 362

Title: Ultrafast two-dimensional x-ray imager with temporal fiducial pulses for laser-produced plasmas

Author(s): Liu, ZD (Liu, Zheng-Dong); Zhong, JY (Zhong, Jia-Yong); Yuan, XH (Yuan, Xiao-Hui); Zhang, YP (Zhang, Ya-Peng); Yao, JW (Yao, Jia-Wen); Ma, ZL (Ma, Zuo-Lin); Xu, XY (Xu, Xiang-Yan); Xue, YH (Xue, Yan-Hua); Zhang, Z (Zhang, Zhe); Yuan, DW (Yuan, Da-Wei); Zhang, MR (Zhang, Min-Rui); Li, BJ (Li, Bing-Jun); Gu, HC (Gu, Hao-Chen); Dai, Y (Dai, Yu); Zhang, CL (Zhang, Cheng-Long); Dong, YF (Dong, Yu-Feng); Zhou, P (Zhou, Peng); Ma, XJ (Ma, Xin-Jie); Ma, YF (Ma, Yun-Feng); Bai, XJ (Bai, Xue-Jie); Liu, GY (Liu, Gao-Yang); Tian, JS (Tian, Jin-Shou); Zhao, G (Zhao, Gang); Zhang, J (Zhang, Jie)

Source: CHINESE PHYSICS B  Volume: 32  Issue: 11  Article Number: 110702  DOI: 10.1088/1674-1056/ace766  Published: NOV 1 2023  

Abstract: It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray streak camera equipped with a row of multi-pinhole arrays. By processing multiple sets of one-dimensional streaked image data acquired from various pinholes, we are capable of reconstructing high-resolution two-dimensional images with a temporal resolution of 38 ps and a spatial resolution of 18 mu m. The temporal fiducial pulses accessed from external sources can advance the precise timing and accurately determine the arrival time of the laser. Moreover, it can correct the nonlinear sweeping speed of the streak camera. The effectiveness of this diagnostic has been successfully verified at the Shenguang-II laser facility, providing an indispensable tool for observing complex physical phenomena, such as the implosion process of laser-fusion experiments.

Accession Number: WOS:001092935100001

Author Identifiers:

ISSN: 1674-1056

eISSN: 2058-3834

Record 51 of 362

Title: Multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation

Author(s): Qin, C (Qin, Chong); Fan, WH (Fan, Wenhui); Wu, Q (Wu, Qi); Jiang, XQ (Jiang, Xiaoqiang); Yan, H (Yan, Hui)

Source: JOURNAL OF OPTICS  Volume: 25  Issue: 11  Article Number: 115103  DOI: 10.1088/2040-8986/acf054  Published: NOV 1 2023  

Abstract: Metasurfaces provide a novel platform for designing high efficiency and multi-functional photonic devices with compact size. Multi-foci metalens have great potential in the applications of optical tomography technology, optical data storage, optical communication and photoelectric detection. Here, in order to broaden the functionality and applicability of multi-foci metalens, a scheme for designing multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation is demonstrated. Based on this, a linear-polarization-dependent multi-foci metalens which can focus x-polarization and y-polarization incident wave into multiple focal points independently is designed and demonstrated numerically, the intensity ratio between the x-polarization foci and y-polarization foci can be tuned continuously by varying the polarization angle of incident wave. In addition, the polarization-independent multi-foci metalens and dual-frequency multi-foci metalens have also been demonstrated by utilizing this method, the intensity ratio among these foci can be designed at will. This work is of great significance for the practical applications of multi-foci metalens.

Accession Number: WOS:001082535600001

Author Identifiers:

ISSN: 2040-8978

eISSN: 2040-8986

Record 52 of 362

Title: An Unmanned Vehicle-Based Remote Raman System for Real-Time Trace Detection and Identification

Author(s): Ren, WZ (Ren, Wenzhen); Wang, B (Wang, Bo); Xie, ZM (Xie, Zhengmao); Wang, H (Wang, Hui); Zhu, XP (Zhu, Xiangping); Zhao, W (Zhao, Wei)

Source: PHOTONICS  Volume: 10  Issue: 11  Article Number: 1230  DOI: 10.3390/photonics10111230  Published: NOV 2023  

Abstract: Raman spectroscopy is a type of inelastic scattering that provides rich information about a substance based on the coupling of the energy levels of their vibrational and rotational modes with an incident light. It has been applied extensively in many fields. As there is an increasing need for the remote detection of chemicals in planetary exploration and anti-terrorism, it is urgent to develop a compact, easily transportable, and fully automated remote Raman detection system for trace detection and identification of information, with high-level confidence about the target's composition and conformation in real-time and for real field scenarios. Here, we present an unmanned vehicle-based remote Raman system, which includes a 266 nm air-cooling passive Q-switched nanosecond pulsed laser of high-repetition frequency, a gated ICMOS, and an unmanned vehicle. This system provides good spectral signals from remote distances ranging from 3 m to 10 m for simulating realistic scenarios, such as aluminum plate, woodblock, paperboard, black cloth, and leaves, and even for detected amounts as low as 0.1 mg. Furthermore, a convolutional neural network (CNN)-based algorithm is implemented and packaged into the recognition software to achieve faster and more accurate detection and identification. This prototype offers a proof-of-concept for an unmanned vehicle with accurate remote substance detection in real-time, which can be helpful for remote detection and identification of hazardous gas, explosives, their precursors, and so forth.

Accession Number: WOS:001113565700001

eISSN: 2304-6732

Record 53 of 362

Title: Quantifying the Accuracy of Microcomb-Based Photonic RF Transversal Signal Processors

Author(s): Sun, Y (Sun, Yang); Wu, JY (Wu, Jiayang); Li, Y (Li, Yang); Tan, MX (Tan, Mengxi); Xu, XY (Xu, Xingyuan); Chu, ST (Chu, Sai Tak); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)

Source: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS  Volume: 29  Issue: 6  Article Number: 7500317  DOI: 10.1109/JSTQE.2023.3266276  Published: NOV 2023  

Abstract: Photonic RF transversal signal processors, which are equivalent to reconfigurable electrical digital signal processors but implemented with photonic technologies, are attractive for high-speed information processing. Optical microcombs are extremely powerful as sources for RF photonics since they can generate many wavelength channels from compact micro-resonators, offering greatly reduced size, power consumption, and complexity. Recently, a variety of signal processing functions have been demonstrated using microcomb-based photonic RF transversal signal processors. Here, we provide a detailed analysis for quantifying the processing accuracy of microcomb-based photonic RF transversal signal processors. First, we investigate the theoretical limitations of the processing accuracy determined by tap number, signal bandwidth, and pulse waveform. Next, we discuss the practical error sources from different experimental components of the signal processors. Finally, we assess the relative contributions of the two to the overall accuracy. We find that the overall accuracy is mainly limited by experimental factors when the processors are properly designed to minimize the theoretical limitations, and that these remaining errors can be further greatly reduced by introducing feedback control to calibrate the processors' impulse response. These results provide a useful guide for designing microcomb-based photonic RF transversal signal processors to optimize their accuracy.

Accession Number: WOS:001009961500001

Author Identifiers:

ISSN: 1077-260X

eISSN: 1558-4542

Record 54 of 362

Title: A Deep Joint Network for Monocular Depth Estimation Based on Pseudo-Depth Supervision

Author(s): Tan, JH (Tan, Jiahai); Gao, M (Gao, Ming); Duan, T (Duan, Tao); Gao, XM (Gao, Xiaomei)

Source: MATHEMATICS  Volume: 11  Issue: 22  Article Number: 4645  DOI: 10.3390/math11224645  Published: NOV 2023  

Abstract: Depth estimation from a single image is a significant task. Although deep learning methods hold great promise in this area, they still face a number of challenges, including the limited modeling of nonlocal dependencies, lack of effective loss function joint optimization models, and difficulty in accurately estimating object edges. In order to further increase the network's prediction accuracy, a new structure and training method are proposed for single-image depth estimation in this research. A pseudo-depth network is first deployed for generating a single-image depth prior, and by constructing connecting paths between multi-scale local features using the proposed up-mapping and jumping modules, the network can integrate representations and recover fine details. A deep network is also designed to capture and convey global context by utilizing the Transformer Conv module and Unet Depth net to extract and refine global features. The two networks jointly provide meaningful coarse and fine features to predict high-quality depth images from single RGB images. In addition, multiple joint losses are utilized to enhance the training model. A series of experiments are carried out to confirm and demonstrate the efficacy of our method. The proposed method exceeds the advanced method DPT by 10% and 3.3% in terms of root mean square error (RMSE(log)) and 1.7% and 1.6% in terms of squared relative difference (SRD), respectively, according to experimental results on the NYU Depth V2 and KITTI depth estimation benchmarks.

Accession Number: WOS:001118070500001

eISSN: 2227-7390

Record 55 of 362

Title: Advanced Biomimetic Multispectral Curved Compound Eye Camera for Aerial Multispectral Imaging in a Large Field of View

Author(s): Zhang, YJ (Zhang, Yuanjie); Xu, HR (Xu, Huangrong); Liu, YM (Liu, Yiming); Zhou, XJ (Zhou, Xiaojun); Wu, DS (Wu, Dengshan); Yu, WX (Yu, Weixing)

Source: BIOMIMETICS  Volume: 8  Issue: 7  Article Number: 556  DOI: 10.3390/biomimetics8070556  Published: NOV 2023  

Abstract: In this work, we demonstrated a new type of biomimetic multispectral curved compound eye camera (BM3C) inspired by insect compound eyes for aerial multispectral imaging in a large field of view. The proposed system exhibits a maximum field of view (FOV) of 120 degrees and seven-waveband multispectral images ranging from visible to near-infrared wavelengths. Pinhole imaging theory and the image registration method from feature detection are used to reconstruct the multispectral 3D data cube. An airborne imaging experiment is performed by assembling the BM3C on an unmanned aerial vehicle (UAV). As a result, radiation intensity curves of several objects are successfully obtained, and a land type classification is performed using the K-means method based on the aerial image as well. The developed BM3C is proven to have the capability for large FOV aerial multispectral imaging and shows great potential applications for distant detecting based on aerial imaging.

Accession Number: WOS:001119961400001

PubMed ID: 37999198

Author Identifiers:

eISSN: 2313-7673

Record 56 of 362

Title: Influence of airborne LiDAR wavelength on the detection distance of clear air turbulence

Author(s): Zhao, J (Zhao, Jing); Luo, XJ (Luo, Xiujuan); Liu, ZH (Liu, Zhaohui); Liu, H (Liu, Hui); Chen, ML (Chen, Minglai); Zhang, Y (Zhang, Yu); Yuea, ZL (Yuea, Zelin)

Source: OPTICAL ENGINEERING  Volume: 62  Issue: 11  DOI: 10.1117/1.OE.62.11.114101  Published: NOV 2023  

Abstract: We comprehensively investigated the influence of laser wavelength on the detection distance at different clear air turbulence (CAT) intensities, distance resolutions, and Brunt-Vaisala frequency theoretically. It is found that there exists the optimal wavelength for maximal detection distance. When the distance resolution is fixed, the detection distance of 532 nm LiDAR is further compared with the 355 and 1064 nm counterparts and is more suitable under moderate to severe CAT. Our findings break the traditional cognition that "ultraviolet wavelength LiDAR is the most suitable for CAT detection" and may promote the remote detection research of CAT.

Accession Number: WOS:001171514000010

ISSN: 0091-3286

eISSN: 1560-2303

Record 57 of 362

Title: An Airborne Visible Light Lidar's Methodology for Clear Air Turbulence Detection Based on Weak Optical Signal

Author(s): Zhao, J (Zhao, Jing); Luo, XJ (Luo, Xiujuan); Liu, H (Liu, Hui)

Source: PHOTONICS  Volume: 10  Issue: 11  Article Number: 1185  DOI: 10.3390/photonics10111185  Published: NOV 2023  

Abstract: A clear air turbulence (CAT) detection method using a 532 nm visible light airborne laser radar (LiDAR) system is proposed to address the urgent challenge in the aviation safety field. This method is based on the indirect detection technique of atmospheric molecular density for CAT and utilizes the strong aerosol scattering absorption characteristics of the iodine molecular 1109 absorption line to eliminate the interference of aerosol scattering and extinction on the weak molecular backscattering signal caused by CAT. This enables CAT detection under conditions where traditional ultraviolet LiDAR systems fail to function properly due to aerosol presence. The influence of axial wind speed and atmospheric temperature variations on the molecular backscattering spectrum in the aircraft flight path is studied, and a formula for vertical wind speed inversion in the CAT field is derived. The 532 nm airborne LiDAR CAT detection theoretical model and system architecture are presented. Through simulation analysis, the CAT detection range of the visible light LiDAR system is evaluated under different aircraft cruising altitudes and turbulence intensities. The results indicate that, with the proposed LiDAR system, the aerosol scattering influence can be effectively suppressed, and CAT can be detected up to 7 km for light-to-moderate turbulence and 10 km for moderate turbulence ahead of the aircraft when traditional ultraviolet LiDAR systems fail as the backscattering coefficient ratio between aerosol and molecule reaches the 10-1 condition. Based on this finding, a suggestion is made to construct a dual-wavelength (ultraviolet-visible) LiDAR system for CAT detection, aiming to solve the full coverage problem of CAT detection under various aerosol conditions. This study has a reference value for promoting the early resolution of CAT detection in the aviation field.

Accession Number: WOS:001118286100001

Author Identifiers:

eISSN: 2304-6732

Record 58 of 362

Title: The Effect of Accelerated Continuous Theta Burst Stimulation on Weight Loss in Overweight Individuals With Schizophrenia: A Double-Blind, Randomized, Sham-Controlled Clinical Trial

Author(s): Kang, DY (Kang, Dongyu); Zhang, Y (Zhang, Yi); Wu, GW (Wu, Guowei); Song, CH (Song, Chuhan); Peng, XJ (Peng, Xinjie); Long, YJ (Long, Yujun); Yu, G (Yu, Guo); Tang, H (Tang, Hui); Gui, YW (Gui, Yawei); Wang, Q (Wang, Quan); Yuan, TF (Yuan, Tifei); Wu, RR (Wu, Renrong)

Source: SCHIZOPHRENIA BULLETIN  DOI: 10.1093/schbul/sbad144  Early Access Date: OCT 2023   

Abstract: Background and Hypothesis Obesity is a common comorbidity in individuals with schizophrenia and is associated with poor clinical outcomes. At present, there are limited effective approaches for addressing this issue. We conducted a double-blind, randomized, sham-controlled clinical trial to investigate the efficacy of noninvasive magnetic stimulation techniques in reducing obesity in individuals with schizophrenia.Study Design Forty overweight individuals with schizophrenia were recruited and randomly assigned to receive either the active or sham intervention. The active group received 50 accelerated continuous theta burst stimulation (cTBS) sessions over the left primary motor area (M1), while the sham group received sham stimulation. The primary outcomes were the change in body weight and body mass index (BMI), and the secondary outcomes were the psychiatric symptoms, eating behavior scales, metabolic measures, and electrophysiological to food picture stimuli.Study Results The study demonstrated a significant decrease in body weight and BMI after the intervention selectively in the active group (mean = -1.33 kg, P = .002), and this improvement remained at the 1-month follow-up (mean = -2.02 kg, P = .008). The score on the Barratt Impulsivity Scale (mean = -1.78, P = 0.036) decreased in the active group and mediated the effect of accelerated cTBS on body weight. In the food picture cue electroencephalograph task, the late positive potential component, which is related to motivated attention and emotional processing, decreased in frontal brain regions and increased in posterior regions after the active intervention.Conclusions The accelerated cTBS may offer a promising approach for treating obesity in individuals with schizophrenia. Further research with a larger sample size or individualized stimulation protocol should be promising.Trial Registration Clinical trial registered with clinicaltrials.gov (NCT05086133).

Accession Number: WOS:001094236900001

PubMed ID: 37921353

Author Identifiers:

ISSN: 0586-7614

eISSN: 1745-1701

Record 59 of 362

Title: Luminescence properties of ZnS_xO_1-x:Ce<SUP>3+</SUP> phosphors with tunable short fluorescence lifetime

Author(s): Xing, X (Xing, Xue); Cao, WW (Cao, Weiwei); Wu, ZX (Wu, Zhaoxin); Bai, XH (Bai, Xiaohong); Gao, JR (Gao, Jiarui); Liang, XZ (Liang, Xiaozhen); Wang, B (Wang, Bo); Wang, C (Wang, Chao); Shi, DL (Shi, Dalian); Lv, LW (Lv, Linwei); Bai, YL (Bai, Yonglin)

Source: MATERIALS LETTERS  Volume: 355  Article Number: 135472  DOI: 10.1016/j.matlet.2023.135472  Early Access Date: OCT 2023   Published: JAN 15 2024  

Abstract: Fluorescence lifetime of phosphors is a critical index in the field of high energy physics and astrophysical detection. A series of ZnSxO1-x:0.05Ce(3+) phosphors with tunable short fluorescence lifetime were prepared by performing high temperature solid state reaction method. The phosphors exhibited two mixed phases consisting of the hexagonal phase ZnO and the hexagonal phase ZnS. They are spherical and the average particle size is 2.24 mu m. As the component content of the ZnS in ZnSxO1-x:0.05Ce(3+) phosphors varies, the emission wavelength can be tuned from 448 nm to 495 nm, the short fluorescence lifetime can be tuned within the range of 6 mu s-200 mu s. By performing exponential fitting, we obtained the equation for the variation of fluorescence lifetime of ZnSxO1-x:0.05Ce(3+) phosphors with ZnS fraction.

Accession Number: WOS:001106393000001

Author Identifiers:

ISSN: 0167-577X

eISSN: 1873-4979

Record 60 of 362

Title: Speckle-correlation-based non-line-of-sight imaging under white-light illumination

Author(s): Zhou, ML (Zhou, Meiling); Zhang, Y (Zhang, Yang); Wang, P (Wang, Ping); Li, RZ (Li, Runze); Peng, T (Peng, Tong); Min, JW (Min, Junwei); Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli)

Source: OPTICS AND LASER TECHNOLOGY  Volume: 170  Article Number: 110231  DOI: 10.1016/j.optlastec.2023.110231  Early Access Date: OCT 2023   Published: MAR 2024  

Abstract: Non-line-of-sight (NLOS) imaging is attracting extensive attention due to its ability to establish the objects hidden from the direct line-of-sight, which prompts potential applications in autonomous driving, robotic vision, biomedical imaging, and other domains. Various NLOS imaging techniques have been successively demonstrated. In this paper, we propose a speckle-correlation-based method to achieve NLOS imaging under white-light illumination. In the proposed method, we process the raw speckle pattern by incorporating the conventional speckle correlation imaging (SCI) with the Zernike polynomial fitting, named ZPF-SCI method, to enhance the performance of the calculated autocorrelation, a key step to achieve optimal image quality. Experimental results demonstrate that our method is effective even in the presence of ambient light, which circumvents the limitation of the conventional SCI that has to be performed in a darkroom. Furthermore, the proposed ZPF-SCI method is insensitive to the angle that the detector deviates from the vertical plane of the optical axis. The quality of the reconstructed image is still acceptable even if the deviation angle reaches 8 degrees. These superiorities facilitate the practical application of the method.

Accession Number: WOS:001101007000001

Author Identifiers:

ISSN: 0030-3992

eISSN: 1879-2545

Record 61 of 362

Title: HQ-I2IT: Redesign the optimization scheme to improve image quality in CycleGAN-based image translation systems

Author(s): Zhang, YP (Zhang, Yipeng); Hu, BL (Hu, Bingliang); Huang, YY (Huang, Yingying); Gao, C (Gao, Chi); Yin, JF (Yin, Jianfu); Wang, Q (Wang, Quang)

Source: IET IMAGE PROCESSING  Volume: 18  Issue: 2  Pages: 507-522  DOI: 10.1049/ipr2.12965  Early Access Date: OCT 2023   Published: FEB 2024  

Abstract: The image-to-image translation (I2IT) task aims to transform images from the source domain into the specified target domain. State-of-the-art CycleGAN-based translation algorithms typically use cycle consistency loss and latent regression loss to constrain translation. In this work, it is demonstrated that the model parameters constrained by the cycle consistency loss and the latent regression loss are equivalent to optimizing the medians of the data distribution and the generative distribution. In addition, there is a style bias in the translation. This bias interacts between the generator and the style encoder and visually exhibits translation errors, e.g. the style of the generated image is not equal to the style of the reference image. To address these issues, a new I2IT model termed high-quality-I2IT (HQ-I2IT) is proposed. The optimization scheme is redesigned to prevent the model from optimizing the median of the data distribution. In addition, by separating the optimization of the generator and the latent code estimator, the redesigned model avoids error interactions and gradually corrects errors during training, thereby avoiding learning the median of the generated distribution. The experimental results demonstrate that the visual quality of the images produced by HQ-I2IT is significantly improved without changing the generator structure, especially when guided by the reference images. Specifically, the Frechet inception distance on the AFHQ and CelebA-HQ datasets are reduced from 19.8 to 10.2 and from 23.8 to 17.0, respectively.
In this work, it is demonstrated that the cycle consistency loss and latent regression loss in CycleGAN-based image translation models can be detrimental to image quality. The optimization scheme of CycleGAN-based image translation systems is redesigned and a new translation model named HQ-I2IT is proposed. Experiments demonstrate that the proposed method can significantly improve image quality and translation accuracy.image

Accession Number: WOS:001087975200001

ISSN: 1751-9659

eISSN: 1751-9667

Record 62 of 362

Title: TiO₂ spatially confined growth of Sb₂(S,Se)₃@TiO₂ NT heterojunction photoanodes and their photoelectrochemical properties

Author(s): Jin, W (Jin, Wei); Liu, DK (Liu, Dekang); Zhang, LY (Zhang, Liyuan); Sun, Q (Sun, Qian); Wang, YS (Wang, Yishan); Liu, EZ (Liu, Enzhou); Hu, XY (Hu, Xiaoyun); Miao, H (Miao, Hui)

Source: CATALYSIS SCIENCE & TECHNOLOGY  Volume: 13  Issue: 24  Pages: 7046-7058  DOI: 10.1039/d3cy01136d  Early Access Date: OCT 2023   Published: DEC 11 2023  

Abstract: Titanium dioxide (TiO2), a conventional n-type semiconductor, was widely used in photocatalysis, electrocatalysis and photoelectrocatalysis due to its good UV absorption and stable physical and chemical properties. However, its wide band gap and low oxygen reaction (OER) activity limited its application in photoelectrochemical (PEC) water splitting. In this work, we successfully constructed type-II Sb-2(S,Se)(3)@TiO2 core-shell heterojunctions. Antimony sulfide selenide (Sb-2(S,Se)(3)) was a quasi-one-dimensional light-absorbing material with an adjustable band gap (1.1-1.8 eV), which broadened the TiO2 light absorption range and effectively promoted the photogenerated carrier separation, transportation and utilization. Of particular note, novel Sb-2(S,Se)(3) nanospheres (NSPs) (ca. 69 nm) were in situ grown inside the tubes attributed to the unique space-confinement effect of TiO2 nanotubes (NTs). The IPCE value for Sb-2(S,Se)(3)@TiO2 at 734 nm was 10.808% compared to 0.030% for TiO2. The separation efficiency and injection efficiency increased from 2.48% and 31.62% to 4.90% and 36.48%, respectively. The onset potential was moved negatively by 60 mV, and the maximum photocurrent density of 1.53 mA cm(-2) at 1.23 V vs. RHE was 13.9 times higher than that of TiO2 (0.11 mA cm(-2)). This work provided a new idea for the application of TiO2 in the field of PEC water splitting.

Accession Number: WOS:001089770800001

Author Identifiers:

ISSN: 2044-4753

eISSN: 2044-4761

Record 63 of 362

Title: Multispectral Image Quality Improvement Based on Global Iterative Fusion Constrained by Meteorological Factors

Author(s): Shi, YT (Shi, Yuetian); Fu, B (Fu, Bin); Wang, N (Wang, Nan); Chen, YX (Chen, Yaxiong); Fang, J (Fang, Jie)

Source: COGNITIVE COMPUTATION  Volume: 16  Issue: 1  Pages: 404-424  DOI: 10.1007/s12559-023-10207-7  Early Access Date: OCT 2023   Published: JAN 2024  

Abstract: It has been proven that the refractive index is related to meteorological parameters in physics. The temperature changes the atmospheric and lens refractive indices, resulting in image degradation. Image restoration aims to recover the sharp image from the degraded images. It is also the basis of many computer vision tasks. A series of methods have been explored and used in this area. Sometimes, meteorological factors cause image degradation. Most of the existing image restoration methods do not consider meteorological factors' influence on image degradation. How meteorological factors affect image quality is not yet known. A multispectral image dataset with corresponding meteorological parameters is presented to solve the problem. We propose a novel multispectral image restoration algorithm using global iterative fusion. The proposed method firstly enhances image edge features through spatial filtering. Then, the Gaussian function is used to constrain the weights between each channel in the image. Finally, a global iterative fusion method is used to fuse image spatial and spectral features to obtain an improved multispectral image. The algorithm explores the impact of meteorological factors on image quality. It considers the impact of atmospheric factors on image quality and incorporates it into the image restoration process. Extensive experimental results illustrate that the method achieves favorable performance on real data. The proposed algorithm is also more robust than other state-of-the-art algorithms. In this paper, we present an algorithm for improving the quality of multispectral images. The proposed algorithm incorporates the influence of meteorological parameters into the image restoration method to better describe the relationship between different spectral channels. Extensive experiments are conducted to validate the effectiveness of the algorithm. Additionally, we investigate the impact of near-surface meteorological parameters on multispectral image quality.