2024
2024
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Record 181 of
Title:Depth-of-field extended Fourier ptychographic microscopy without defocus distance priori
Author Full Names:Chen, Yanqi; Xu, Jinghao; Pan, AnSource Title:OPTICS LETTERSLanguage:EnglishDocument Type:ArticleKeywords Plus:ILLUMINATIONAbstract:Fourier ptychographic microscopy (FPM) provides a solution of high-throughput phase imaging. Thanks to its coherent imaging model, FPM has the capacity of depth-of-field (DOF) extension by simultaneously recovering the sample's transmittance function and pupil aberration, which contains a defocus term. However, existing phase retrieval algorithms (PRs) often struggle in the presence of a significant defocus. In this Letter, different PRs with embedded pupil recovery are compared, and the one based on the alternating direction multiplier method (ADMM-FPM) demonstrates promising potential for reconstructing highly defocused FPMimages. Besides, we present a plug-and-play framework that integrates ADMM-FPM and total variation or Hessian denoiser for pupil function enhancement. Both simulations and experiments demonstrate that this framework enables robust reconstruction of defocused FPM images without any prior knowledge of defocus distance or sample characteristics. In experiments involving USAF 1951 targets and pathologic slides, ADMM-FPM combined with the Hessian denoiser successfully corrected the defocus up to approximately 200 mu m, i.e., extending the DOF to 400 mu m. (c) 2024 Optica Publishing GroupAddresses:[Chen, Yanqi; Xu, Jinghao; Pan, An] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Chen, Yanqi; Xu, Jinghao; Pan, An] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:49Issue:11Start Page:3222End Page:3225DOI Link:http://dx.doi.org/10.1364/OL.524267數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001296250000002 -
Record 182 of
Title:Spectral-interferometry-based diff-iteration for high-precision micro-dispersion measurement
Author Full Names:Du, Wei; Huang, Jingsheng; Wang, Yang; Zhao, Maozhong; Li, Juan; He, Juntao; Wang, Jindong; Zhang, Wenfu; Zhu, TaoSource Title:PHOTONICS RESEARCHLanguage:EnglishDocument Type:ArticleKeywords Plus:CHROMATIC DISPERSION; OPTICAL-FIBERS; PROPAGATION DELAY; LASERAbstract:Precise measurement of micro-dispersion for optical devices (optical fiber, lenses, etc.) holds paramount significance across domains such as optical fiber communication and dispersion interference ranging. However, due to its complex system, complicated process, and low reliability, the traditional dispersion measurement methods (interference, phase shift, or time delay methods) are not suitable for the accurate measurement of micro-dispersion in a wide spectral range. Here, we propose a spectral-interferometry-based diff-iteration (SiDi) method for achieving accurate wide-band micro-dispersion measurements. Using an optical frequency comb, based on the phase demodulation of the dispersion interference spectrum, we employ the carefully designed SiDi method to solve the dispersion curve at any position and any order. Our approach is proficient in precisely measuring micro-dispersion across a broadband spectrum, without the need for cumbersome wavelength scanning processes or reliance on complex high-repetitionrate combs, while enabling adjustable resolution. The efficacy of the proposed method is validated through simulations and experiments. We employed a chip-scaled soliton microcomb (SMC) to compute the dispersion curves of a 14 m single-mode fiber (SMF) and a 0.05 m glass. Compared to a laser interferometer or the theoretical value given by manufacturers, the average relative error of refractive index measurement for single-mode fiber (SMF) reaches 2.8 x 10-6 and for glass reaches 3.8 x 10-6. The approach ensures high precision, while maintaining a simple system structure, with realizing adjustable resolution, thereby propelling the practical implementation of precise measurement and control-dispersion. (c) 2024 Chinese Laser PressAddresses:[Du, Wei; Huang, Jingsheng; Zhao, Maozhong; Li, Juan; He, Juntao; Wang, Jindong; Zhu, Tao] Chongqing Univ, Key Lab Optoelect Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China; [Wang, Yang; Zhang, Wenfu] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Chongqing University; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:12Issue:6Start Page:1362End Page:1370DOI Link:http://dx.doi.org/10.1364/PRJ.523314數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001242008200008 -
Record 183 of
Title:High-Power GHz Burst-Mode All-Fiber Laser System with Sub 300 fs Pulse Duration
Author Full Names:Li, Feng; Zhao, Wei; Fu, Yuxi; Xing, Jixin; Wen, Wenlong; Wang, Lei; Li, Qianglong; Cao, Xue; Zhao, Hualong; Wang, YishanSource Title:PHOTONICSLanguage:EnglishDocument Type:ArticleKeywords Plus:REPETITION RATE; FEMTOSECOND; ABLATIONAbstract:An all-fiber low-repetition-rate SESAM mode-locked fiber oscillator combined with a dispersion-managed active fiber loop produces a flexible GHz burst-mode laser source. The high-power output is then produced by amplifying the GHz burst-mode laser source using an all-fiber chirped-pulse amplification system. Then, the laser is compressed using a grating pair compressor; a maximum amplified power of 97 W is obtained. This results in a compressed high power of 82.07 W with a power stability RMS of 0.09% and beam quality better than 1.2. Accurate dispersion control allows for the production of a high-quality pulse duration of 265 fs.Addresses:[Li, Feng; Zhao, Wei; Fu, Yuxi; Xing, Jixin; Wen, Wenlong; Wang, Lei; Li, Qianglong; Cao, Xue; Zhao, Hualong; Wang, Yishan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & PhotonicsPublication Year:2024Volume:11Issue:6Article Number:570DOI Link:http://dx.doi.org/10.3390/photonics11060570數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001255783500001 -
Record 184 of
Title:Stress-Induced Polarization-Maintaining Large-Mode-Area Photonic Crystal Fibers With Deviation of the Single-Mode Transmission Band and Delocalization of Higher-Order Modes
Author Full Names:Ma, Yuan; Wan, Rui; Yang, Huanhuan; Li, Yanfu; Chen, Chao; Wang, PengfeiSource Title:IEEE PHOTONICS JOURNALLanguage:EnglishDocument Type:ArticleKeywords Plus:CONFINEMENT LOSS; DISPERSION; GUIDANCEAbstract:The nonlinear effects and laser-induced optical and thermal damage in optical fibers, together with the limitations of beam quality and mode-field area, restrict the power scaling-up of single-mode output for developing high-power fiber lasers in the kilowatt and above range. The design of photonic crystal fibers (PCFs) with large mode areas is an effective way to address this problem. In this paper, the demands and challenges of designing very large-mode-area (VLMA-) PCFs are discussed, including the overall fiber structure design and property simulation, especially the precise definition of single-mode operating conditions of VLMA-PCFs. Finally, an advanced stress-induced polarization-maintaining, Yb-doped, PCF structure with a large mode area realized by introducing both leakage channels and higher order mode-filtering units is proposed and analyzed theoretically, for which a maximum core diameter of 101 $\boldsymbol{\mu}{\text{m}}$ and single-mode field diameter of 76.33 $\boldsymbol{\mu}{\text{m}}$ at 1064 $\text{nm}$ and a birefringence value $\boldsymbol{> 10<^>{-4}}$ orders of magnitude are achieved.Addresses:[Ma, Yuan; Wan, Rui; Chen, Chao; Wang, Pengfei] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Ma, Yuan; Yang, Huanhuan; Li, Yanfu] Air Force Engn Univ, Informat & Nav Coll, Xian 710077, Peoples R China; [Wan, Rui; Chen, Chao] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Air Force Engineering University; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:16Issue:3Article Number:7101111DOI Link:http://dx.doi.org/10.1109/JPHOT.2024.3395776數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001230813700003 -
Record 185 of
Title:Wide-angle metalens array with quadratic phase for terahertz polarization detection
Author Full Names:Qin, Chong; Fan, Wenhui; Wu, Qi; Jiang, Xiaoqiang; Yan, Hui; Ju, PeiSource Title:PHYSICA SCRIPTALanguage:EnglishDocument Type:ArticleKeywords Plus:IMAGING POLARIMETRY; LENS; METASURFACES; APERTURE; DESIGN; DEPTHAbstract:With the advances of micro/nano fabrication technology, metasurface has become an alternative to design functional devices for manipulating electromagnetic wave. Metalens is one of the basic electromagnetic functional devices that can be applied in various fields. Currently, polarization measurement based on metalens arrays has been widely investigated, but most of them can only work for normal incident wave due to the limited field-of-view of metalens. Herein, a dielectric wide-angle metalens array (WMA) for the terahertz polarization detection is presented. The WMA is composed of three wide-angle metalenses, each wide-angle metalens is constructed by utilizing quadratic phase profile. The angle tolerance of meta-atoms which constitute the wide-angle metalens is elucidated in detail. The WMA can decompose incident terahertz wave into four channels, and the full Stokes parameters of incident wave is determined by intensities in these four channels. Simulated results show that the WMA proposed here has excellent performance for the polarization detection within incident angle of +/- 40 degrees . In addition, this WMA can also be used to detect the phase gradient of incident terahertz wave, the detection error is less than 1.1%. This WMA is promising in the fields of terahertz polarization generation, detection and imaging.Addresses:[Qin, Chong; Fan, Wenhui; Wu, Qi; Jiang, Xiaoqiang; Yan, Hui; Ju, Pei] Xian Inst Opt & Precis Mech, Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Qin, Chong; Fan, Wenhui; Wu, Qi; Jiang, Xiaoqiang; Yan, Hui] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Fan, Wenhui] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R ChinaAffiliations: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 UniversityPublication Year:2024Volume:99Issue:6Article Number:65515DOI Link:http://dx.doi.org/10.1088/1402-4896/ad3d91數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001214799100001 -
Record 186 of
Title:A Novel Self-Adaptive Deformable Convolution-Based U-Net for Low-Light Image Denoising
Author Full Names:Wang, Hua; Cao, Jianzhong; Guo, Huinan; Li, ChengSource Title:SYMMETRY-BASELLanguage:EnglishDocument Type:ArticleAbstract:Capturing images under extremely low-light conditions usually suffers from various types of noise due to the limited photon and low signal-to-noise ratio (SNR), which makes low-light denoising a challenging task in the field of imaging technology. Nevertheless, existing methods primarily focus on investigating the precise modeling of real noise distributions while neglecting improvements in the noise modeling capabilities of learning models. To address this situation, a novel self-adaptive deformable-convolution-based U-Net (SD-UNet) model is proposed in this paper. Firstly, deformable convolution is employed to tackle noise patterns with different geometries, thus extracting more reliable noise representations. After that, a self-adaptive learning block is proposed to enable the network to automatically select appropriate learning branches for noise with different scales. Finally, a novel structural loss function is leveraged to evaluate the difference between denoised and clean images. The experimental results on multiple public datasets validate the effectiveness of the proposed method.Addresses:[Wang, Hua; Cao, Jianzhong; Guo, Huinan; Li, Cheng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Wang, Hua] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:16Issue:6Article Number:646DOI Link:http://dx.doi.org/10.3390/sym16060646數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001255937400001 -
Record 187 of
Title:Dual-parameter controlled reconfigurable metasurface for enhanced terahertz beamforming via inverse design method
Author Full Names:Wu, Qi; Fan, Wen-Hui; Qin, Chong; Jiang, Xiao-QiangSource Title:PHYSICA SCRIPTALanguage:EnglishDocument Type:ArticleKeywords Plus:BROAD-BAND; FUNDAMENTAL LIMITS; WIDE-ANGLE; GRAPHENE; PHASEAbstract:Recently, reconfigurable metasurfaces have emerged as a promising solution for wavefront manipulation in the terahertz (THz) region, providing enhanced beamforming capabilities. However, traditional single-parameter control methods fail to achieve independent phase and amplitude modulation, constraining their modulation capabilities. Meanwhile, forward design methods based on phase matching ignore the structural responses of the non-ideal unit, leading to degraded beamforming performance. Here, we introduce an electrically reconfigurable metasurface composed of bilayer graphene strips based on dual-parameter control. Full-wave simulations demonstrate independent amplitude and phase modulation, achieving the full 360 degrees phase coverage and an adjustable amplitude range from 0 to 0.8 at 2.6 THz. To optimize beamforming performance, particularly for the responses of the non-ideal unit away from the designed frequency, we employed an inverse design method based on a hybrid evolutionary algorithm. This novel approach significantly enhances beam steering, achieving a maximum 60% increase in beam directivity and maintaining over 90% of ideal directivity across a broad frequency range from 1.6 THz to 5 THz. Especially, it achieves a maximum deflection angle of 75 degrees. Meanwhile, the adaptability of the inverse design method is further demonstrated to various optimized objectives. For beam focusing, even with limited phase control (below 210 degrees), this method significantly enhances the focusing quality (up to 150% enhancement) and increases the focusing efficiency from 25% to 40%. Additionally, it effectively mitigates the impact of quantized phase errors on beamforming. This research not only demonstrates potential applications in high-speed THz wireless communication and compact imaging systems but also paves the way for innovative designs in reconfigurable metasurfaces.Addresses:[Wu, Qi; Fan, Wen-Hui; Qin, Chong; Jiang, Xiao-Qiang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Wu, Qi; Fan, Wen-Hui; Qin, Chong; Jiang, Xiao-Qiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Fan, Wen-Hui] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R ChinaAffiliations:State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanxi UniversityPublication Year:2024Volume:99Issue:6Article Number:65517DOI Link:http://dx.doi.org/10.1088/1402-4896/ad43c3數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001218945700001 -
Record 188 of
Title:Noncollinear phase matching and effective nonlinear coefficient calculations for biaxial crystal out of the principal plane
Author Full Names:Xing, Dingding; Yi, Dongchi; Yuan, Suochao; Chen, Xiaoyi; Da, ZhengshangSource Title:APPLIED PHYSICS B-LASERS AND OPTICSLanguage:EnglishDocument Type:ArticleKeywords Plus:PARAMETRIC INTERACTIONS; DIRECTION LOCI; CLASSIFICATION; GENERATIONAbstract:The essential factor in laser frequency conversion involves phase matching within nonlinear optical crystals. To our knowledge, few studies have investigated the noncollinear phase matching calculation for biaxial crystal out of the principal plane. In this paper, we propose an arbitrary direction phase matching model and a computational method based on gradient descent (GD) algorithm, which can be applied to noncollinear in the principal plane, collinear and noncollinear out of the principal plane. In the case of 1053 nm third harmonic generation (THG) in LiB3O5 (LBO) crystal, the phase matching conditions are converted into a system of nonlinear equations with six variables and six equations, which can be solved by iterative optimization search with the GD algorithm and includes type-I (ss-f) and type-II (fs-f). We reveal the relationship of phase matching angles and effective nonlinear coefficients (d(eff)) for various structures. Our method uncovers the existence of many solutions in the non-principal plane with gamma > 8 degrees and the (eff) close to the maximum value 0.66834 pm/V at theta = 90 degrees, phi = 141.84 degrees and gamma = 0. The resolution of the arbitrary direction phase matching problem holds significant importance, as it expands the possibilities for laser frequency conversion, especially for noncollinear structures.Addresses:[Xing, Dingding; Yi, Dongchi; Chen, Xiaoyi; 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; [Yuan, Suochao] Shaanxi Univ Sci & Technol, Coll Bioresources Chem & Mat Engn, Xian 710021, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shaanxi University of Science & TechnologyPublication Year:2024Volume:130Issue:6Article Number:109DOI Link:http://dx.doi.org/10.1007/s00340-024-08247-4數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001236159800001 -
Record 189 of
Title:The Influence and Compensation of Microwave Holographic Measurement Errors on Antenna Measurement Accuracy
Author Full Names:Zhao, Yongqing; Xiang, Binbin; Lin, Shangmin; Zhang, Yang; Wang, WeiSource Title:APPLIED SCIENCES-BASELLanguage:EnglishDocument Type:ArticleKeywords Plus:LARGE REFLECTOR ANTENNAS; RADIO TELESCOPE; MODELAbstract:Microwave holographic measurement technology is a common method used in antenna measurement. This method has high measurement efficiency and high precision. To evaluate and enhance the antenna's performance, it is crucial to precisely determine the surface deformation. In this paper, the effects of feed offset error and scanning error on the antenna microwave holographic measurement results are investigated, and corresponding error compensation methods are proposed. The relationship between the influence of the error sources on the antenna gain loss and surface deformation accuracy is established. The reasons for holographic measurement errors, their characteristics, and their specific impact on system performance can be better understood. In order to improve the accuracy of the measurement, the compensation methods for the different measurement errors are given. They can provide the theoretical basis for maintaining and enhancing the performance of antenna system.Addresses:[Zhao, Yongqing; Xiang, Binbin; Zhang, Yang; Wang, Wei] Xinjiang Univ, Coll Mech Engn, Urumqi 830047, Peoples R China; [Lin, Shangmin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Xinjiang University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:14Issue:12Article Number:5272DOI Link:http://dx.doi.org/10.3390/app14125272數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001254599900001 -
Record 190 of
Title:Three-dimensional crumpled d-Ti3C2Tx/PANI structure enabled by PANI interlayer spacing control for enhanced electrochemical performance
Author Full Names:Zhao, Yuanbo; He, Weijun; Chen, Yanan; Liu, Yanan; Xing, Hongna; Zhu, Xiuhong; Feng, Juan; Liao, Chunyan; Zong, Yan; Li, Xinghua; Zheng, XinliangSource Title:MATERIALS TODAY COMMUNICATIONSLanguage:EnglishDocument Type:ArticleKeywords Plus:2-DIMENSIONAL TITANIUM CARBIDE; ELECTRODE MATERIAL; CARBON NANOFIBERS; POLYANILINE; SUPERCAPACITOR; NANOPARTICLES; COMPOSITES; FABRICATION; HYBRID; MXENESAbstract:The self-stacking and collapsing of few-layered Ti3C2Tx(d-Ti3C2Tx) results in its poor rate capability and cycle performance during charge/discharge processes. Constructing a three-dementional (3D) structure, introducing interlayer spacers and using alkaline electrolytes are effective and powerful strategies to resolve the problems. Herein, a 3D crumpled d-Ti(3)C(2)Tx/PANI composite was successfully prepared by HCl/LiF in-situ etching Ti3AlC2 to obtain d-Ti3C2Tx and polymerizing PANI onto its surface with ice-bath stirring. Benefiting from the synergistic effect of kinetically favorable structure, component and alkaline electrolytes, The PM-1 (d-Ti(3)C(2)Tx/PANI-1) as an electrode remarkably improves the electrochemical performances compared with the original d-Ti(3)C(2)Tx in 2 M KOH electrolyte. It exhibits a specific capacitance of 230 mF cm(-2)(115 F g(-1)) at 2 mA cm(-2), high rate capability of 81.2% at 20 mA cm(-2) and outstanding stability of 96.7% retention after 5000 cycles at 10 mA cm(-2). Furthermore, an assembled symmetric supercapacitor (SSC) also presents an excellent stability performance with 82.4% retention after 5000 cycles at 8 mA cm(-2) and a promising energy storage performance. The related work provides a good reference for the MXene-based electrode materials in the conditions of alkaline electrolytes.Addresses:[Zhu, Xiuhong] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Zhao, Yuanbo; He, Weijun; Chen, Yanan; Liu, Yanan; Xing, Hongna; Zhu, Xiuhong; Feng, Juan; Liao, Chunyan; Zong, Yan; Li, Xinghua; Zheng, Xinliang] Northwest Univ, Sch Phys, Xian 710069, Peoples R ChinaAffiliations:State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Northwest University Xi'anPublication Year:2024Volume:39Article Number:108689DOI Link:http://dx.doi.org/10.1016/j.mtcomm.2024.108689數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001291655600001 -
Record 191 of
Title:Multi-Objective Topology Optimization of Acquisition Pointing and Tracking System
Author Full Names:Gao, Bo; Yang, Hongtao; Chen, Weining; Wang, Hao; Fei, Jiaqi; Qi, ZimiaoSource Title:INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCELanguage:EnglishDocument Type:ArticleKeywords Plus:DESIGN; HOMOGENIZATION; ALGORITHM; BESOAbstract:There is a growing need for the lightweight acquisition, tracking, and pointing (APT) system during satellite launches due to the escalating demand in space missions. The APT system may work under multiple loading cases during different launch steps. Hence, this study introduces an innovative amalgamation of genetic operation and bi-directional evolutionary structural optimization (BESO) to fulfill the multi-objective requirements through the attainment of Pareto optimal fronts. A typical instance in two dimensions illustrates the effectiveness of the innovative multi-objective approach by contrasting the outcomes acquired from a solitary fulfillment requirement under two distinct burdens. Furthermore, the novel multi-objective method is utilized to remove inefficient material from the APT system by 20.12%. To ensure the safety of the lightweight design, the simulation and experiment of random vibration are both investigated according to the fundamental natural frequency of the launcher.Addresses:[Gao, Bo; Yang, Hongtao; Chen, Weining; Wang, Hao; Fei, Jiaqi] Chinese Acad Sci, Xian Inst Opt & Precis Mech, 17 Xinxi Rd,New Ind Pk, Xian 710119, Shaanxi, Peoples R China; [Gao, Bo; Yang, Hongtao; Qi, Zimiao] Univ Chinese Acad Sci, 1 Yanqihu East Rd, Beijing 101408, Peoples R China; [Gao, Bo; Chen, Weining] Xian Key Lab Spacecraft Opt Imaging & Measurement, 17 Xinxi Rd,New Ind Pk, Xian 710119, Shaanxi, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:38Issue:6DOI Link:http://dx.doi.org/10.1142/S0218001424560032數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001235771800001 -
Record 192 of
Title:A painting authentication method based on multi-scale spatial-spectral feature fusion and convolutional neural network
Author Full Names:Zeng, Zimu; Zhang, Pengchang; Qiu, Shi; Li, Siyuan; Liu, XuebinSource Title:COMPUTERS & ELECTRICAL ENGINEERINGLanguage:EnglishDocument Type:ArticleAbstract:The scientific authentication of paintings holds significant importance within the realm of art collection. Employing convolutional neural networks for the classification of authentic and counterfeit painting images based on color images is a viable but suboptimal choice. This study investigates the potential for authenticating paintings by incorporating high-spectral images alongside high-resolution spatial images. High-resolution and high-spectral images of genuine and counterfeit paintings were acquired using a push-broom digital scanning system. The processing methods presented in this approach for the acquired images are: 1) The study utilized the circular local binary pattern (LBP) and principal component analysis (PCA) to extract surface texture and spectral data from Chinese character images in paintings, encompassing both spatial and spectral dimensions. 2) The technique utilizing non-subsampling Shearlet transform (NSST) and pulse-coupled neural network (PCNN) was employed to integrate the spatial and spectral characteristics of the images into a pseudo-color image, producing a dataset of feature data for genuine and counterfeit paintings. 3) The experiments aimed to achieve the authenticity of artworks using EfficientNet v2-s, the hyperparameters of which were fine-tuned accordingly. The experimental findings demonstrate that this approach attained a 90.8 % accuracy on the test dataset, representing a 3.5 % enhancement over the existing top-performing three-dimensional convolutional neural network (3D-CNN).Addresses:[Zeng, Zimu; Zhang, Pengchang; Qiu, Shi; Li, Siyuan; Liu, Xuebin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol CAS, Xian 710119, Peoples R China; [Zeng, Zimu] Univ Chinese Acad Sci, Beijing 100408, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:118Article Number:109315DOI Link:http://dx.doi.org/10.1016/j.compeleceng.2024.109315數(shù)據(jù)庫ID（收錄號(hào)）:WOS:001246477700001