2024

• Record 385 of
  
  Title:Space advanced technology demonstration satellite
  
  Author Full Names:Zhang, Xiaofeng; Chen, Wen; Zhu, Xiaocheng; Meng, Na; He, Junwang; Bi, Xingzi; Zhang, Yonghe; Shi, Qi; Li, Fei; Liu, Rui; Feng, Zhenggong; Liu, Liu; Li, Jinsong; Wu, Haichen; Xu, Dongxiao; Li, Taijie; Huang, Jiangjiang; Liu, Shuo; Li, Tiantong; Yu, Xiansheng; Gao, Yang; Zhou, Heng; Ban, Hanyu; Zhang, Yanli; Zhang, Yueting; Yang, Yingquan; He, Tao; Duan, Xuliang; Chen, Xin; Wang, Yamin; Sun, Antai; Zhang, Kuoxiang; Sun, Ying; Wang, Yaobin; Fan, Chengcheng; Xiong, Shaolin; Li, Xinqiao; Wen, Xiangyang; Ling, Zhixing; Sun, Xiaojin; Zhang, Chen; Bai, Xianyong; Wang, Zhanshan; Deng, Yuanyong; Tian, Hui; Yang, Jianfeng; Xue, Hongbo; Sang, Peng; Liu, Jinguo; Zheng, Huilong; Zhu, Xiang; He, Jianwu; Li, Hui; Xu, Luxiang; Xu, Shuyan; Chen, Wenwu; Liu, Zhendong; Wang, Zhaoli; Mao, Xianglong; Gao, Rong; Li, Zongxuan; Ding, Guopeng; Wang, Xinyu; Dou, Runjiang; Weng, Lubin; Luo, Hao; Wang, Yaping; Liang, Xianfeng; Fang, Ziruo

  Source Title:SCIENCE CHINA-TECHNOLOGICAL SCIENCES

  Language:English

  Document Type:Article

  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.

  Addresses:[Zhang, Xiaofeng; Chen, Wen; Zhu, Xiaocheng; Meng, Na; He, Junwang; Bi, Xingzi; Zhang, Yonghe; Shi, Qi; Li, Fei; Liu, Rui; Feng, Zhenggong; Liu, Liu; Li, Jinsong; Wu, Haichen; Xu, Dongxiao; Li, Taijie; Huang, Jiangjiang; Liu, Shuo; Li, Tiantong; Yu, Xiansheng; Gao, Yang; Zhou, Heng; Ban, Hanyu; Zhang, Yanli; Zhang, Yueting; Yang, Yingquan; He, Tao; Duan, Xuliang; Chen, Xin; Wang, Yamin; Sun, Antai; Zhang, Kuoxiang; Sun, Ying; Wang, Yaobin; Fan, Chengcheng; Ding, Guopeng; Wang, Xinyu; Wang, Yaping; Fang, Ziruo] Chinese Acad Sci, Innovat Acad Microsatellites, Shanghai 201203, Peoples R China; [Xiong, Shaolin; Li, Xinqiao; Wen, Xiangyang] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China; [Ling, Zhixing; Zhang, Chen; Bai, Xianyong; Deng, Yuanyong] Natl Astron Observ China, Beijing 100101, Peoples R China; [Sun, Xiaojin] Chinese Acad Sci, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China; [Wang, Zhanshan] Tongji Univ, Inst Precis Opt Engn, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China; [Tian, Hui] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China; [Yang, Jianfeng; Mao, Xianglong; Gao, Rong] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Xue, Hongbo; Sang, Peng; Zhu, Xiang; Liang, Xianfeng] Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China; [Liu, Jinguo] Chinese Acad Sci, Shenyang Inst Automat, Shenyang 110016, Peoples R China; [Zheng, Huilong] Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China; [He, Jianwu] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; [Li, Hui] Chinese Acad Sci, Shanghai Inst Organ Chem, Shanghai 200032, Peoples R China; [Xu, Luxiang] Univ Chinese Acad Sci, Hangzhou Inst Adv Study, Hangzhou 310024, Peoples R China; [Xu, Shuyan] Nanyang Technol Univ, Singapore 569830, Singapore; [Chen, Wenwu; Liu, Zhendong] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China; [Wang, Zhaoli] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100049, Peoples R China; [Li, Zongxuan] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Peoples R China; [Dou, Runjiang] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China; [Weng, Lubin] Chinese Acad Sci, Inst Automat, Beijing 100190, Peoples R China; [Luo, Hao] Zhejiang Univ, Sch Aeronaut & Astronaut, Hangzhou 310058, Peoples R China

  Affiliations:Chinese Academy of Sciences; Innovation Academy for Microsatellites, CAS; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Chinese Academy of Sciences; National Astronomical Observatory, CAS; Chinese Academy of Sciences; Shanghai Institute of Technical Physics, CAS; Tongji University; Peking University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; National Space Science Center, CAS; Chinese Academy of Sciences; Shenyang Institute of Automation, CAS; Chinese Academy of Sciences; Institute of Engineering Thermophysics, CAS; Chinese Academy of Sciences; Institute of Mechanics, CAS; Chinese Academy of Sciences; Shanghai Institute of Organic Chemistry, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Nanyang Technological University; Chinese Academy of Sciences; Dalian Institute of Chemical Physics, CAS; Chinese Academy of Sciences; Technical Institute of Physics & Chemistry, CAS; Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; Chinese Academy of Sciences; Institute of Semiconductors, CAS; Chinese Academy of Sciences; Institute of Automation, CAS; Zhejiang University

  Publication Year:2024

  Volume:67

  Issue:1

  Start Page:240

  End Page:258

  DOI Link:http://dx.doi.org/10.1007/s11431-023-2510-x

  数据库ID（收录号）:WOS:001133133000007
• Record 386 of
  
  Title:Rapid prediction of regenerator performance for regenerative cryogenics cryocooler based on convolutional neural network
  
  Author Full Names:Chen, Xiantong; Li, Shanshan; Yu, Jun; Yang, Sen; Chen, Hao

  Source Title:INTERNATIONAL JOURNAL OF REFRIGERATION

  Language:English

  Document Type:Article

  Keywords Plus:GENERALIZATION ABILITY; FLOW

  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.

  Addresses:[Chen, Xiantong; Li, Shanshan; Chen, Hao] Dalian Minzu Univ, Coll Civil Engn, Dalian 116000, Peoples R China; [Yu, Jun] Dalian Minzu Univ, Dept Math, Dalian 116000, Peoples R China; [Yang, Sen] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 610100, Peoples R China

  Affiliations:Dalian Minzu University; Dalian Minzu University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS

  Publication Year:2024

  Volume:158

  Start Page:225

  End Page:237

  DOI Link:http://dx.doi.org/10.1016/j.ijrefrig.2023.11.025

  数据库ID（收录号）:WOS:001139904900001
• Record 387 of
  
  Title:Multi-scale convolutional neural networks and saliency weight maps for infrared and visible image fusion
  
  Author Full Names:Yang, Chenxuan; He, Yunan; Sun, Ce; Chen, Bingkun; Cao, Jie; Wang, Yongtian; Hao, Qun

  Source Title:JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION

  Language:English

  Document Type:Article

  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.

  Addresses:[Yang, Chenxuan; Chen, Bingkun; Cao, Jie; Wang, Yongtian; Hao, Qun] Beijing Inst Technol, Sch Opt & Photon, Beijing 100081, Peoples R China; [He, Yunan] Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China; [Sun, Ce] Chinese Acad Sci, Xi An Inst Opt & Precis Mech, Xian 710119, Peoples R China

  Affiliations:Beijing Institute of Technology; Beijing Institute of Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS

  Publication Year:2024

  Volume:98

  Article Number:104015

  DOI Link:http://dx.doi.org/10.1016/j.jvcir.2023.104015

  数据库ID（收录号）:WOS:001164113200001
• Record 388 of
  
  Title:A different view on the deactivation process of 3-hydroxy-salicylidene-methylamine system
  
  Author Full Names:Han, Guoxia; Wei, Hongyan; Yu, Xianghua; Zhang, Jialing; Ma, Yanbin; Liu, Peng

  Source Title:CHEMICAL PHYSICS LETTERS

  Language:English

  Document Type:Article

  Keywords Plus:CURVE CROSSING PROBLEMS; INTRAMOLECULAR PROTON-TRANSFER; SALICYLIDENE METHYLAMINE; NONADIABATIC TRANSITION; SEMICLASSICAL THEORY; MOLECULAR-DYNAMICS; RING-CLOSURE; STATE; PHOTOCHEMISTRY; SPECTRA

  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.

  Addresses:[Han, Guoxia; Zhang, Jialing; Ma, Yanbin; Liu, Peng] China Univ Petr East China, Coll Sci, Qingdao 266580, Shandong, Peoples R China; [Wei, Hongyan] Taiyuan Univ Technol, Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China; [Yu, Xianghua] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China

  Affiliations:China University of Petroleum; Taiyuan University of Technology; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS

  Publication Year:2024

  Volume:835

  Article Number:141004

  DOI Link:http://dx.doi.org/10.1016/j.cplett.2023.141004

  数据库ID（收录号）:WOS:001134840800001
• Record 389 of
  
  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 Full Names:Liu, Dekang; Jin, Wei; Zhang, Liyuan; Li, Qiujie; Sun, Qian; Wang, Yishan; Hu, Xiaoyun; Miao, Hui

  Source Title:JOURNAL OF ALLOYS AND COMPOUNDS

  Language:English

  Document Type:Article

  Keywords Plus:SB2S3; FABRICATION

  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).

  Addresses:[Liu, Dekang; Jin, Wei; Zhang, Liyuan; Li, Qiujie; Sun, Qian; Hu, Xiaoyun; Miao, Hui] Northwest Univ, Sch Phys, Xian 710127, Peoples R China; [Wang, Yishan] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China

  Affiliations:Northwest University Xi'an; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences

  Publication Year:2024

  Volume:975

  Article Number:172926

  DOI Link:http://dx.doi.org/10.1016/j.jallcom.2023.172926

  数据库ID（收录号）:WOS:001127814800001
• Record 390 of
  
  Title:Multilevel-based algorithm for hyperspectral image interpretation
  
  Author Full Names:Qiu, Shi; Ye, Huping; Liao, Xiaohan; Zhang, Benyue; Zhang, Miao; Zeng, Zimu

  Source Title:COMPUTERS & ELECTRICAL ENGINEERING

  Language:English

  Document Type:Article

  Keywords Plus:NETWORK; RGB

  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.

  Addresses:[Qiu, Shi; Zhang, Benyue; Zhang, Miao; Zeng, Zimu] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol CAS, Xian 710119, Peoples R China; [Ye, Huping; Liao, Xiaohan] Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; [Ye, Huping; Liao, Xiaohan] Civil Aviat Adm China, Key Lab Low Altitude Geog Informat & Air Route, Beijing 100101, Peoples R China; [Liao, Xiaohan] Chinese Acad Sci, Res Ctr UAV Applicat & Regulat, Beijing 100101, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences

  Publication Year:2024

  Volume:113

  Article Number:109033

  DOI Link:http://dx.doi.org/10.1016/j.compeleceng.2023.109033

  数据库ID（收录号）:WOS:001126685300001
• Record 391 of
  
  Title:Observation of three kinds of bound solitons in a black phosphorus-based erbium fiber laser
  
  Author Full Names:Li, Wenlei; Lin, Ruping; Chen, Guangwei; Geng, Gaoli; Xu, Peng; Yang, Yining; Wang, Xinliang; Xu, Jian

  Source Title:OPTICAL FIBER TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:SATURABLE ABSORBER; PULSE GENERATION; STATE SOLITONS; VECTOR

  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.

  Addresses:[Li, Wenlei; Lin, Ruping; Geng, Gaoli; Xu, Peng; Yang, Yining; Wang, Xinliang; Xu, Jian] Henan Polytech Univ, Sch Phys & Elect Informat Engn, Jiaozuo 454000, Peoples R China; [Li, Wenlei] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Chen, Guangwei] Beijing Informat Sci & Technol Univ, Beijing 100192, Peoples R China

  Affiliations:Henan Polytechnic University; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Beijing Information Science & Technology University

  Publication Year:2024

  Volume:82

  Article Number:103617

  DOI Link:http://dx.doi.org/10.1016/j.yofte.2023.103617

  数据库ID（收录号）:WOS:001127091900001
• Record 392 of
  
  Title:Influence of wavefront distortion on the measurement of pulse signal-to-noise ratio
  
  Author Full Names:Xing, Dingding; Yuan, Suochao; Kou, Jingwei; Da, Zhengshang

  Source Title:OPTICS COMMUNICATIONS

  Language:English

  Document Type:Article

  Keywords Plus:TEMPORAL CONTRAST; LASER-PULSE; ENHANCEMENT; GENERATION; AMPLIFIER

  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.

  Addresses:[Xing, Dingding; Yuan, Suochao; Kou, Jingwei; Da, Zhengshang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Adv Opt Instrument Res Dept, Xian 710119, Peoples R China; [Xing, Dingding] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:554

  Article Number:130110

  DOI Link:http://dx.doi.org/10.1016/j.optcom.2023.130110

  数据库ID（收录号）:WOS:001128009100001
• Record 393 of
  
  Title:A truncated test scheme design method for success-failure in-orbit tests
  
  Author Full Names:Ding, Wenzhe; Bai, Xiang; Wang, Qingwei; Long, Fang; Li, Hailin; Wu, Zhengrong; Liu, Jian; Yao, Huisheng; Yang, Hong

  Source Title:RELIABILITY ENGINEERING & SYSTEM SAFETY

  Language:English

  Document Type:Article

  Keywords Plus:OPTIMIZATION

  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.

  Addresses:[Ding, Wenzhe; Bai, Xiang; Wang, Qingwei; Long, Fang; Li, Hailin; Wu, Zhengrong; Liu, Jian; Yao, Huisheng; Yang, Hong] Beijing Inst Tracking & Telecommun Technol, Beijing 100096, Peoples R China; [Ding, Wenzhe] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS

  Publication Year:2024

  Volume:243

  Article Number:109782

  DOI Link:http://dx.doi.org/10.1016/j.ress.2023.109782

  数据库ID（收录号）:WOS:001118808500001
• Record 394 of
  
  Title:The deactivation effects of Nd3+ion for 2.85 μm laser in Ho3+/Nd3+co-doped fluorotellurite glass
  
  Author Full Names:Feng, Shaohua; Zhu, Jun; Liu, Chengzhen; Xiao, Yang; Cai, Liyang; Xu, Yantao; Xiao, Xusheng; Guo, Haitao

  Source Title:JOURNAL OF LUMINESCENCE

  Language:English

  Document Type:Article

  Keywords Plus:M EMISSION; SPECTROSCOPIC PROPERTIES; GERMANATE GLASSES; HIGH-POWER; FIBER; CRYSTAL; ER3+; TM3+

  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.

  Addresses:[Feng, Shaohua; Zhu, Jun; Liu, Chengzhen; Xiao, Yang; Cai, Liyang; Xu, Yantao; Xiao, Xusheng; Guo, Haitao] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Shaanxi, Peoples R China; [Feng, Shaohua; Zhu, Jun; Liu, Chengzhen; Xiao, Yang; Cai, Liyang; Xu, Yantao; Xiao, Xusheng; Guo, Haitao] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; [Guo, Haitao] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanxi University

  Publication Year:2024

  Volume:266

  Article Number:120308

  DOI Link:http://dx.doi.org/10.1016/j.jlumin.2023.120308

  数据库ID（收录号）:WOS:001166707300001
• Record 395 of
  
  Title:Scale and pattern adaptive local binary pattern for texture classification
  
  Author Full Names:Hu, Shiqi; Li, Jie; Fan, Hongcheng; Lan, Shaokun; Pan, Zhibin

  Source Title:EXPERT SYSTEMS WITH APPLICATIONS

  Language:English

  Document Type:Article

  Keywords Plus:FRAMEWORK

  Abstract:Local binary pattern (LBP) with a fixed sampling template is sensitive to scale changes. Furthermore, under rotation changes or noise corruptions, one uniform LBP pattern can be corrupted to fall into a non-uniform pattern which loses its discrimination power to describe the corresponding texture feature. To overcome these two main drawbacks, we propose a scale and pattern adaptive local binary pattern (SPALBP). Firstly, in the gradient-based sampling radius adaptive scheme, eight directional adaptive sampling radius of each center pixel can be obtained by using its eight Kirsch gradient values. Secondly, in the noise and rotation robust neighborhood sampling scheme, three neighborhood sampling templates are used to extract three kinds of averaging neighborhood pixels. Thirdly, for each center pixel, three kinds of LBPriu2 patterns can be extracted by sampling these three kinds of averaging neighborhood pixels along eight directional adaptive sampling radius. Finally, an optimal SPALBP uniform pattern can be adaptively selected from these three LBPriu2 patterns. Hence, all SPALBP patterns show more robustness against scale changes, rotation changes and noise corruptions. Extensive experiments are conducted on four standard texture databases: Outex, UIUC, CUReT and XU_HR. Comparing with state-of-the-art LBP-based variants, the proposed SPALBP method consistently shows superior performance both in dramatic environment changes and high-levels of noise conditions, meanwhile it maintains a lower texture feature dimension.

  Addresses:[Hu, Shiqi; Li, Jie; Lan, Shaokun; Pan, Zhibin] Xi An Jiao Tong Univ, Fac Elect & Informat Engn, Xian 710049, Shaanxi, Peoples R China; [Hu, Shiqi] AV Xian Flight Automat Control Res Inst, Xian 710076, Peoples R China; [Fan, Hongcheng] AF Engn Univ, Inst Informat & Nav, Xian 710077, Peoples R China; [Pan, Zhibin] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China

  Affiliations:Xi'an Jiaotong University; Air Force Engineering University; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences

  Publication Year:2024

  Volume:240

  Article Number:122403

  DOI Link:http://dx.doi.org/10.1016/j.eswa.2023.122403

  数据库ID（收录号）:WOS:001160655900001
• Record 396 of
  
  Title:A compact 51.6-W, 26-μ J, Yb-doped all-fiber integrated CPA system through quasi-rectangular pulse pre-shaping
  
  Author Full Names:Li, Qianglong; Li, Feng; Liu, Hongjun; Zhao, Wei; Zhao, Hualong; Wang, Yishan; Wen, Wenlong; Cao, Xue; Si, Jinhai

  Source Title:OPTICS AND LASER TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:FEMTOSECOND FIBER; PARABOLIC PULSES; AMPLIFICATION; GENERATION; COMPRESSION; AMPLIFIER; ENERGY; POWER; PROPAGATION; DISPERSION

  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.

  Addresses:[Li, Qianglong; Li, Feng; Liu, Hongjun; Zhao, Wei; Zhao, Hualong; Wang, Yishan; Wen, Wenlong; Cao, Xue] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Shaanxi, Peoples R China; [Li, Qianglong; Cao, Xue; Si, Jinhai] Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Xian 710049, Shaanxi, Peoples R China; [Li, Qianglong; Cao, Xue] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

  Affiliations:State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Xi'an Jiaotong University; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:170

  Article Number:110300

  DOI Link:http://dx.doi.org/10.1016/j.optlastec.2023.110300

  数据库ID（收录号）:WOS:001113391800001