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2020年
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第 1 条,共 34 条
标题: Femtosecond laser-induced non-centrosymmetric surface microstructures on bulk metallic glass for unidirectional droplet micro-displacement
作者: Li, C (Li, Chen); Yang, LJ (Yang, Lijun); Ren, XZ (Ren, Xuezhuang); Yang, Y (Yang, Yong); Cheng, GH (Cheng, Guanghua)
来源出版物: JOURNAL OF PHYSICS D-APPLIED PHYSICS 卷: 53 期: 10 文献号: 105305 DOI: 10.1088/1361-6463/ab5df7 出版年: MAR 6 2020

摘要: Unidirectional droplet motion without energy input has attracted considerable attention in various potential applications. We report on the fabrication of unconventional laser-induced periodic surface structures (LIPSS) for unidirectional droplet micro-displacement by a femtosecond laser at a large incident angle. In order to overcome the mechanical durability of the existing soft materials such as PDMS for controlling the droplet, Zr-based bulk metallic glass (Zr-BMG) is used to fabricate the typical non-centrosymmetric unconventional LIPSS, which include micro-sized elliptical arc-shaped structures and nano-ripples with the central spatial periodicity of 400 nm. The spots and the grating of unconventional LIPSS on Zr-BMG are fabricated to construct the functional surface structures by femtosecond laser irradiation. The unidirectional micro-displacement of water droplet on Zr-BMG was achieved using functional surface structures. For better understanding the fabrication of unconventional LIPSS, the underlying formation mechanism was revealed by numerical simulations. This work gives a fast, precise and low-cost method to fabricate the non-centrosymmetric surface micro/nano-structures on metal materials for unidirectional droplet motion in microfluidics.
入藏号: WOS:000505057200001
作者识别号:
作者        Web of Science ResearcherID        ORCID 号
LI, Chen                  0000-0001-9442-1014

ISSN: 0022-3727
eISSN: 1361-6463 

第 2 条,共 34 条
标题: Investigating limiting factors for self-assembly of carbon nanotubes: A molecular dynamics simulation study
作者: Zhang, JW (Zhang, Jianwei); Cui, JL (Cui, Jianlei); Wei, FQ (Wei, Fengqi); Wang, WJ (Wang, Wenjun); He, XQ (He, Xiaoqiao); Mei, XS (Mei, Xuesong)
来源出版物: APPLIED SURFACE SCIENCE 卷: 504 文献号: 144397 DOI: 10.1016/j.apsusc.2019.144397 出版年: FEB 28 2020

摘要: Multi-scale patterned assembly and integration is an important solution to break through the industrial application of carbon nanotubes (CNTs). The strategy based on self-assembly has yielded fruitful achievements in the practice of fabricating patterns such as two dimensional arrays. However, the mechanism of self-assembly of CNTs and the key factors that limit the fidelity of patterns have always been an unresolved issue. In this paper, all-atomic molecular models for studying the mechanism of hydrophilic/hydrophobic self-assembly are established and some key factors limiting the fidelity of SWNTs patterns are thoroughly investigated. The results show that chiral indices have little effect on the results of self-assembly. Secondly, edge effect determines the assembly sequence on hydrophilic surface and self-assembly will not occur when M-SWNTs are above the hydrophilic/hydrophobic interface. Thirdly, the assembly sequence of M-SWNTs in different layers of the solution is dominated by the competition of H2O molecules. At last, shielding effect is very important for the study of how to improve the density of SWNTs in the pattern. The explicitly results are not only helpful to understand many phenomena in self-assembly process at the atomic scale but also will provide meaningful guidance in fabrication of SWNTs patterns to prevent distortion.
入藏号: WOS:000502040600097
作者识别号:
作者        Web of Science ResearcherID        ORCID 号
Cui, Jianlei                  0000-0002-5760-509X

ISSN: 0169-4332
eISSN: 1873-5584 

第 3 条,共 34 条
标题: Importance of the parallel polarization radiance for estimating inorganic particle concentrations in turbid waters based on radiative transfer simulations
作者: Liu, J (Liu, Jia); Hu, BL (Hu, Bingliang); He, XQ (He, Xianqiang); Bai, Y (Bai, Yan); Tian, LQ (Tian, Liqiao); Chen, TQ (Chen, Tieqiao); Wang, YH (Wang, Yihao); Pan, DL (Pan, Delu)
来源出版物: INTERNATIONAL JOURNAL OF REMOTE SENSING DOI: 10.1080/01431161.2020.1727059 提前访问日期: FEB 2020

摘要: Contemporary ocean colour radiometers and inversion algorithms to derive optical properties and oceanic constituents rely only on the scalar treatment of water-leaving radiance (L-w). However, L-w polarization components, which contain embedded hydrosol information, have been largely neglected. Here, we examine L-w polarization characteristics, based on vector radiative transfer (RT) simulation, for determining suspended particulate matter in highly turbid waters. The RT simulations show that parallel polarization radiance (PPR) can improve the retrieval of L-w, with a higher relative fraction of ocean colour signal to total radiance (I-oc/I-t) than the total intensity (I). Moreover, the reflectance for PPR (), compared with that for I, is more sensitive to inorganic particle concentration (IPC) variations, particularly those in the red and NIR bands. Additionally, displays significant directional and spectral variations with respect to geometrical conditions, and the maximum (similar to 10%) is highly peaked at 555 nm in the solar plane. Furthermore, the superiority of PPR to retrieve IPCs, based on the back propagation neural network, was discussed with a very high determination coefficient. Significant improvements in inversion accuracy were observed for PPR with a lower relative deviation (0.901%) than I (3.740%). This study highlights that PPR might be used as an alternative approach to retrieve L-w and thus to derive biogeochemical parameters, particularly in turbid coastal waters.
入藏号: WOS:000514447200001
ISSN: 0143-1161
eISSN: 1366-5901 

第 4 条,共 34 条
标题: Under-oil self-driven and directional transport of water on a femtosecond laser-processed superhydrophilic geometry-gradient structure
作者: Wu, JR (Wu, Junrui); Yin, K (Yin, Kai); Li, LM (Li, Ming); Wu, ZP (Wu, Zhipeng); Xiao, S (Xiao, Si); Wang, H (Wang, Hua); Duan, JA (Duan, Ji-An); He, J (He, Jun)
来源出版物: NANOSCALE 卷: 12 期: 6 页: 4077-4084 DOI: 10.1039/c9nr09902f 出版年: FEB 14 2020
摘要: Self-driven and continuous directional transport of water droplets in an oil environment has great potential applications in microfluidics, oil-water separation, etc. Nevertheless, most current studies exploit water behaviors occurring in air, and the directional regulation of water in a viscous oil medium remains a challenge. In this work, a superhydrophilic geometry-gradient stainless steel platform with nanoparticle-covered nanoripple structures is proposed using femtosecond laser direct writing technology. The as-prepared platform spontaneously and directionally transported water droplets in the oil environment from the minor side to the large side of the trapezoidal platform surface, but not in the opposite direction. The transport velocity of water droplets as a function of trapezoid angle and tilt angle of the as-prepared platform was investigated in detail. In addition, a pumpless under-oil water transport platform was successfully prepared on other substrates including Ti and Ni sheets, polyimide film, and C cloth, and exhibited transport capabilities when the platform was flexed and combined into various shapes. This work offers insight into the simple fabrication of a flexible and substrate-independent pumpless under-oil directional transport device for water.
入藏号: WOS:000515391000052
PubMed ID: 32022050
作者识别号:
作者        Web of Science ResearcherID        ORCID 号
Xiao, Si                  0000-0002-7172-3607
Yin, Kai         S-9883-2017         0000-0002-0763-3834

ISSN: 2040-3364
eISSN: 2040-3372 

第 5 条,共 34 条
标题: Simulation and experiment of X-ray communication in re-entry dusty plasma region
作者: Li, Y (Li, Yao); Su, T (Su, Tong); Sheng, LZ (Sheng, Lizhi); Xu, N (Xu, Neng); Zhao, BS (Zhao, Baosheng)
来源出版物: MODERN PHYSICS LETTERS B 卷: 34 期: 4 文献号: 2050057 DOI: 10.1142/S0217984920500578 出版年: FEB 10 2020

摘要: Compared with the other wireless communication band, X-ray carrier has the merits of lower wavelength, higher frequency and photon energy, which could provide a novel method to solve the communication problems of re-entry blackout region. In this paper, transmission characteristics of X-ray carrier in the re-entry dusty plasma medium were analyzed first, simulation results indicate that dusty particles were more likely to impede the microwave signal than X-ray carrier. Then an alkali metal plasma source was designed to simulate the re-entry dusty plasma sheath for simplification. Transmission co-efficiency under different X-ray energy were tested, which pointed out that X-ray signal would obtain more than 79.4% transmission co-efficiency on condition of dynamic and dusty plasma medium. Finally, we give our proposal and potential capability of X-ray communication in the re-entry plasma condition.
入藏号: WOS:000514154000009
ISSN: 0217-9849
eISSN: 1793-6640 

第 6 条,共 34 条
标题: Sol-gel derived SiO2-B2O3-Na2O-ZnO-Al2O3 glass powder for glass-based composite
作者: Wen, CX (Wen, Changxiu); Cui, XX (Cui, Xiaoxia); Xu, YT (Xu, Yantao); Yang, PX (Yang, Pengxiang); Wang, XZ (Wang, Xiaozhang); Zhang, H (Zhang, Hui); Zhang, Y (Zhang, Yang); Lu, M (Lu, Min); Guo, HT (Guo, Haitao)
来源出版物: MODERN PHYSICS LETTERS B 卷: 34 期: 4 文献号: 2050052 DOI: 10.1142/S0217984920500529 出版年: FEB 10 2020

摘要: The glass powder with a relatively complicated composition of 64.02SiO(2)-10.05B(2)O(3)-7.84Na(2)O-14.07ZnO-4.02Al(2)O(3) (in wt.%) was first synthesized via sol-gel route. The optimal synthesis conditions for the amorphous gel are obtained. The glass transition temperature (T-g) of xerogel was detected as 552 degrees C and the glass network structure formed by the [SiO4], [BO4] and [AlO4] units were confirmed by the Fourier Transform-Infrared Spectroscopy (FT-IR). The phase structure and morphologies of glass powder were characterized by X-ray diffractometer (XRD) and Field Emission-Scanning Electron Microscope (FE-SEM), the xerogels and sol-gel glasses exhibit amorphous phase when the heat-treatment temperature increases from 300 degrees C to 700 degrees C. The prepared glass powder with high specific surface areas and a large amount of pores contribute to the synthesis of a composite of glass-mullite-beta-eucryptite at a relatively low sintering temperature of 800 degrees C, which present a relatively low coefficient of thermal expansion (CTE) and high mechanical strength.
入藏号: WOS:000514154000004
ISSN: 0217-9849
eISSN: 1793-6640 

第 7 条,共 34 条
标题: Development of an In-Situ Laser Machining System Using a Three-Dimensional Galvanometer Scanner
作者: Li, X (Li, Xiao); Liu, B (Liu, Bin); Mei, XS (Mei, Xuesong); Wang, WJ (Wang, Wenjun); Wang, XD (Wang, Xiaodong); Li, X (Li, Xun)
来源出版物: ENGINEERING 卷: 6 期: 1 页: 68-76 DOI: 10.1016/j.eng.2019.07.024 出版年: FEB 2020
摘要: In this study, a three-dimensional (3D) in-situ laser machining system integrating laser measurement and machining was built using a 3D galvanometer scanner equipped with a side-axis industrial camera. A line structured light measurement model based on a galvanometer scanner was proposed to obtain the 3D information of the workpiece. A height calibration method was proposed to further ensure measurement accuracy, so as to achieve accurate laser focusing. In-situ machining software was developed to realize time-saving and labor-saving 3D laser processing. The feasibility and practicability of this in-situ laser machining system were verified using specific cases. In comparison with the conventional line structured light measurement method, the proposed methods do not require light plane calibration, and do not need additional motion axes for 3D reconstruction; thus they provide technical and cost advantages. The in-situ laser machining system realizes a simple operation process by integrating measurement and machining, which greatly reduces labor and time costs. (C) 2020 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company.
入藏号: WOS:000513938300013
ISSN: 2095-8099
eISSN: 2096-0026 

第 8 条,共 34 条
标题: The laser-induced damage change detection for optical elements using siamese convolutional neural networks
作者: Kou, JW (Kou, Jingwei); Zhan, T (Zhan, Tao); Zhou, DY (Zhou, Deyun); Wang, W (Wang, Wei); Da, ZS (Da, Zhengshang); Gong, MG (Gong, Maoguo)
来源出版物: APPLIED SOFT COMPUTING 卷: 87 文献号: 106015 DOI: 10.1016/j.asoc.2019.106015 出版年: FEB 2020

摘要: Due to the fact that weak and fake laser-induced damages may occur in the surface of optical elements in high-energy laser facilities, it is still a challenging issue to effectively detect the real laser-induced damage changes of optical elements in optical images. Different from the traditional methods, in this paper, we put forward a similarity metric optimization driven supervised learning model to perform the laser-induced damage change detection task. In the proposed model, an end-toend siamese convolutional neural network is designed and trained which can integrate the difference image generating and difference image analysis into a whole network. Thus, the damage changes can be highlighted by the pre-trained siamese network that classifies the central pixel between input multi-temporal image patches into changed and unchanged classes. To address the problem of unbalanced distribution between positive and negative samples, a modified average frequency balancing based weighted softmax loss is used to train the proposed network. Experiments conducted on two real datasets demonstrate the effectiveness and superiority of the proposed model. (C) 2019 Elsevier B.V. All rights reserved.
入藏号: WOS:000509341500042
ISSN: 1568-4946
eISSN: 1872-9681 

第 9 条,共 34 条
标题: Tracing and implementation of IMM Kalman filtering feed-forward compensation technology based on neural network
作者: Lin, D (Lin Di); Wu, YM (Wu Yi-ming)
来源出版物: OPTIK 卷: 202 文献号: UNSP 163574 DOI: 10.1016/j.ijleo.2019.163574 出版年: FEB 2020

摘要: UAV has great varieties, large controllable velocity and angular velocity, which makes high requirements on automatically identifying capability and tracking accuracy of ground search and tracking system. It happens frequently that servo feed-forward compensation technology is added in the search and tracking system to improve the tracking accuracy. However, accurate estimations of target velocity and acceleration becomes the difficult point of controlling feed-forward compensation technology. This paper proposes to adopt IMM Kalman filter technology based on neural network to estimate velocity and acceleration of the moving targets, which served as input variable of the servo feed-forward compensation system to eliminate the error of the missing distance caused by velocity and acceleration. Neural network can identify target types and makes self-adaptive adjustment on IMM Kalman filter parameters, which is helpful to improve estimation accuracy. Experimental results show that IMM Kalman filter feed-forward compensation technology based on neural network in the search and tracking system can improve the tracking accuracy of the system by more than 3 times than the conventional Kalman filter compensation, and the model verification is effective.
入藏号: WOS:000506348800172
ISSN: 0030-4026
eISSN: 1618-1336 

第 10 条,共 34 条
标题: Self-trapped spatially localized states in combined linear-nonlinear periodic potentials
作者: Shi, JC (Shi, Jin-Cheng); Zeng, JH (Zeng, Jian-Hua)
来源出版物: FRONTIERS OF PHYSICS 卷: 15 期: 1 DOI: 10.1007/s11467-019-0930-3 出版年: FEB 2020

摘要: We analyze the existence and stability of two kinds of self-trapped spatially localized gap modes, gap solitons and truncated nonlinear Bloch waves, in one- and two-dimensional optical or matter-wave media with self-focusing nonlinearity, supported by a combination of linear and nonlinear periodic lattice potentials. The former is found to be stable once placed inside a single well of the nonlinear lattice, it is unstable otherwise. Contrary to the case with constant self-focusing nonlinearity, where the latter solution is always unstable, here, we demonstrate that it nevertheless can be stabilized by the nonlinear lattice since the model under consideration combines the unique properties of both the linear and nonlinear lattices. The practical possibilities for experimental realization of the predicted solutions are also discussed.
入藏号: WOS:000497667500002
ISSN: 2095-0462
eISSN: 2095-0470 

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