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Optoelectronic Devices and Integration, OEDI 2014

作者： Yang, YueXing Zhang, XianBin Yang, Peng Fang, Qiong Wei, XuYan Guo, YunHui Cui, Hong Department of applied physics Xi'an university of technology Xi'an China College of automation and information engineering Xi'an university of technology Xi'an China

ISBN: (纸本)1557522774

Physical and optical characteristics of GaAs crystal in terahertz radiation are detected by asynchronous electro-optic sampling spectroscopy. In this experiment, we have obtained the refractive index and absorption rate of GaAs crystal in 0.1THz to 2.5THz radiation. The experimental results show that the average refractive index of GaAs crystal is 3.6. The mutation of refractive index and negative absorption rate occur in 1.12 THz, 1.66 THz and 2.20 THz. By analyzing the kinematics characteristics of transverse optical phonon of GaAs crystal in terahertz spectrum, we find that the coupling between terahertz wave and transverse optical phonon is the reason for the sudden change of refractive index and negative absorption phenomenon. © OSA 2014.

关键词： Refractive index

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A potential adjustable THz filter--volume phase grating

A potential adjustable THz filter--volume phase grating

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Advanced Spectroscopy and Applications, ASA 2017

作者： Zhang, Xian Bin Xu, Yi Cui, Hong Wei, Xu Yan Chen, Wen Qiang Wang, Guanqi Department of applied physics Xi'an university of technology Xi'an China College of automation and information engineering Xi'an university of technology Xi'an China

This paper simulated the diffraction efficiency of volume grating driven by ultrasonic wave based on GaP crystal. The model can reflect-selecting electromagnetic wave in terahertz (THz) wave band, so which is a potent... 详细信息

ISBN: (纸本)9781943580378

关键词： III-V semiconductors

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The Influence of the Soil Moisture to Spectrum of Nature Radiation

The Influence of the Soil Moisture to Spectrum of Nature Rad...

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7th International Symposium on Radiation Safety and Detection technology(第七届国际声辐射安全与检测技术研讨会)(ISORD-7)

作者： Qingxian,ZHANG YiGU Liangquan,GE Guoqiang,ZENG The College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059

The nature radiation is mainly from the radioelement in soil, as uranium, thorium and their *** the moisture of soil change, radon released from soil to air changes.

关键词： natural radioactivity gamma-ray soil moisture Monte Carlo method

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Kinematics simulation and control design of the agile wrist in a dual-arm robotic mechanical systems

Kinematics simulation and control design of the agile wrist ...

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2012 IEEE International Conference on Computer Science and automation engineering, CSAE 2012

作者： Jian, Yang Angeles, Jorge College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China Department of Mechanical Engineering Centre for Intelligent Machines McGill University Montreal QC Canada

ISBN: (纸本)9781467300865

In order to improve space positioning accuracy of the Agile Wrist consisting of a modified spherical parallel manipulator, which will influence the result of the Collisions experiment in a robotic mechanical testbed directly, this paper explores the motion control of Agile Wrist. Based on analysis an input - output (I/O) equation of spherical four-bar linkages for forward-displacement of spherical parallel robots, the inverse kinematics derivation is reported here to find the active-joint variables for each possible position and orientation (pose) of the mobile plate, as well as the singularity exist and defines what may be generalized as the workspace boundary. Meanwhile the kinematics simulation by using simulink S-Function combined with Q8 controller was carried out. The results showed that the Kinematics analysis and Control Design of Agile Wrist were correct. The modified spherical parallel manipulator can meet with the demands of Collisions experiment in the robotic mechanical testbed. © 2012 IEEE.

关键词： Robotics

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Search for Solar Boosted Dark Matter Particles at the PandaX-4T Experiment

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Physical Review Letters 2025年第16期134卷 161003-161003页

作者： Guofang Shen Zihao Bo Wei Chen Xun Chen Yunhua Chen Zhaokan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Zhixing Gao Lisheng Geng Karl Giboni Xunan Guo Xuyuan Guo Zichao Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang Houqi Huang Junting Huang Ruquan Hou Yu Hou Xiangdong Ji Xiangpan Ji Yonglin Ju Chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li Zhiyuan Li Qing Lin Jianglai Liu Congcong Lu Xiaoying Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Dong Shan Xiaofeng Shang Xiyuan Shao Manbin Shen Wenliang Sun Yi Tao Anqing Wang Guanbo Wang Hao Wang Jiamin Wang Lei Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Xu Wang Zhou Wang Yuehuan Wei Weihao Wu Yuan Wu Mengjiao Xiao Xiang Xiao Kaizhi Xiong Yifan Xu Shunyu Yao Binbin Yan Xiyu Yan Yong Yang Peihua Ye Chunxu Yu Ying Yuan Zhe Yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Jifang Zhou Jiaxu Zhou Jiayi Zhou Ning Zhou Xiaopeng Zhou Yubo Zhou Zhizhen Zhou Haipeng An Haoming Nie School of Physics Beihang University Beijing 102206 China School of Physics and Astronomy Shanghai Jiao Tong University Key Laboratory for Particle Astrophysics and Cosmology (MoE) Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240 China New Cornerstone Science Laboratory Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 201210 China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213 China Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu 610051 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China Department of Physics Yantai University Yantai 264005 China Key Laboratory of Nuclear Physics and Ion-beam Application (MoE) Institute of Modern Physics Fudan University Shanghai 200433 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing 100191 China International Research Center for Nuclei and Particles in the Cosmos and Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 China Southern Center for Nuclear-Science Theory (SCNT) Institute of Modern Physics Chinese Academy of Sciences Huizhou 516000 China SJTU Paris Elite Institute of Technology Shanghai Jiao Tong University Shanghai 200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Physics University of Maryland College Park Maryland 20742 USA School of Physics Nankai University Tianjin 300071 China School of Physics Sun Yat-Sen University Guangzhou 510275 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Research Center for Particle Science and Technology

We present a novel constraint on light dark matter utilizing 1.54 metric ton/year of data acquired from the PandaX-4T dual-phase xenon time projection chamber. This constraint is derived through detecting electronic recoil signals resulting from the interaction with solar-enhanced dark matter flux. Low-mass dark matter particles, lighter than a few MeV/c2, can scatter with the thermal electrons in the Sun. Consequently, with higher kinetic energy, the boosted dark matter component becomes detectable via contact scattering with xenon electrons, resulting in a few keV energy deposition that exceeds the threshold of PandaX-4T. We calculate the expected recoil energy in PandaX-4T considering the Sun’s acceleration with heavy mediators and the detection capabilities of the xenon detector. The first experimental search results using the xenon detector yield the most stringent upper limits cross section of 3.51×10−39 cm2 at 0.08 MeV/c2 for a solar boosted dark matter mass ranging from 0.02 to 10 MeV/c2, achieving a 23-fold improvement compared with earlier experimental studies.

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Study the performance and analyze the uncertainty of 1.6μm irradiation thermometer

Study the performance and analyze the uncertainty of 1.6μm ...

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IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011

作者： Ye, Zikui Hao, Xiaopeng Yuan, Zundong Yang, Jian College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China Division of Thermometry and Materials Evaluation National Institute of Metrology P. R. China Beijing 100013 China

ISBN: (纸本)9781424481590

An irradiation thermometer with 1.6μm center wavelength was established at National Institute of Metrology P.R. China, temperature range of which is from 420°C to 1085°C. This paper introduces the measurement principle, structure and calibration method of irradiation thermometer, the stability of the irradiation thermometer, the noise equivalent temperature difference (NETD) of the thermometer at Zn fixed point and the expanded uncertainty at Zn, Al and Cu fixed points. The stability is 0.05°C, 0.07°C and 0.05°C during four months at Zn, Al and Cu fixed points, respectively. The value of the NETD including 16 times measurement results is lower than 25 mk at freezing platform of Zn fixed point. The expanded uncertainty of the irradiation thermometer is 0.24°C, 0.26°C, and 0.22°C at Zn, Al and Cu fixed points, respectively. © 2011 IEEE.

关键词： Irradiation

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Frequency Attention Module for Speaker Recognition 5

Frequency Attention Module for Speaker Recognition

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5th International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2022

作者： Wu, Yujiao Fang, Zulin Dong, Jianping Zhang, Gexiang Chengdu University of Technology College of Computer Science and Cyber Security Chengdu China Chengdu University of Technology School of Nuclear Technology and Automation Engineering Chengdu China

ISBN: (数字)9781665499163

ISBN: (纸本)9781665499163

Speaker recognition is a task of identifying user's individuality from their speech utterances. Most of the text-independent speaker recognition models available directly input the spectrogram into the deep neural network. However, this does not take full advantage of the spectrogram features. In this paper, we propose a frequency attention module (FAM) based on the fact that the frequency axis in the spectrogram is more representative for speaker feature extraction. It aims to assigning higher weights to important frequency bins, and making the network to extract more features to improve speaker recognition performance. Furthermore, FAM is applied on the convolution output in ResBlock of ResNet34 to capture richer features of the speaker. The experimental results under self-attention pooling (SAP) and attentive-statistics pooling (ASP) show that FAM is feasible and effective. Moreover, the extended experimental results on the Free ST Chinese Mandarin Corpus dataset indicate that the proposed FAM (equal error rate (EER) is 1.59%) outperforms the no-attention ResNet34 (EER is 1.97 %) and spatial-CBAM ResNet34 (EER is 1.88%). © 2022 IEEE.

关键词： Deep neural networks

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Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

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中国物理C（英文版） 2015年第7期39卷 102-106页

作者： FENG Zhao-Dong JIANG Peng ZHANG Hong-Kai ZHAO Bo-Zhen QIN Xiu-Bo WEI Cun-Feng LIU Yu Key Laboratory of Nuclear Radiation and Nuclear Energy Technology Institute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 China Beijing Engineering Research Center of Radiographic Techniques and Equipment Beijing 100049 China University of Chinese Academy of Sciences Beijing 100049 China The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China Key Laboratory of Nuclear Radiation and Nuclear Energy Technology Institute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 China Beijing Engineering Research Center of Radiographic Techniques and Equipment Beijing 100049 China

Thallium-doped cesium iodide (CsI(Tl)) screens are widely used in X-ray imaging devices because of the columnar structure of the CsI(Tl) layer,but few reports focus on the optical role of the substrate in the screen *** this paper,four substrates including fused silica (SiO2),silver-film coated SiO2,graphite (C) and fiber optic plate (FOP) are used to fabricate CsI(Tl) screens by thermal *** imaging performance is evaluated by relative light output (RLO),modulation transfer function (MTF),normalized noise power spectrum (NNPS) and noise equivalent quanta (NEQ).The results reveal that although CsI(Tl) film on graphite plate yields images with the lowest light output,it presents relatively higher spatial resolution and better signal-to-noise ***,films on SiO2 plate obtain low MTF but high NNPS curves,whether they are coated with silver film or ***,scintillation screens on FOP have bright images with low NNPS and high NEQ,but have the lowest *** controlling the substrate optical features,CsI(Tl) films can be tailored to suit a given application.

关键词： CsI(Tl) scintillation screen substrate imaging performance evaluation

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Design and Study of a One-Foot, Multi-Suction Structure for a Wall-Climbing Robot

Design and Study of a One-Foot, Multi-Suction Structure for ...

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2022 International Conference on Intelligent Manufacturing and Industrial automation, CIMIA 2022

作者： Cao, YiFan Luo, YaoYao Liu, YanLing Mei, Hao Yang, WenQing Zhang, JiaWei The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu610059 China School of Mechanical and Electrical Engineering Chengdu University of Technology Sichuan Chengdu610059 China

ISBN: (纸本)9781510655966

Wall climbing robots, also known as wall moving robots, are also known abroad as extreme work robots because vertical wall work is beyond human limits. Despite its superior performance, there has been little research on the subject. This paper introduces a vacuum adsorption structure for a one-footed multi-suction wall climbing robot and establishes a one-footed multi-suction model. Using a four-legged wall crawler as a carrier, the basic conditions to be met by this structure are analysed for both the three-legged and four-legged suction states of the wall crawler. The feasibility of attaching the robot to the structure to move on a vertical wall is verified. The deformation of the body is simulated by ansys for the two adsorption states with load forces ranging from 500N to 700N to verify the feasibility of the structure and to derive a range of feasibility. © 2022 SPIE.

关键词： Robot applications

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Robust State Estimation for Delayed Genetic Regulatory Networks Using Sampled-Data 29

Robust State Estimation for Delayed Genetic Regulatory Netwo...

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第29届中国控制与决策会议

作者： Weilu Chen Dongyan Chen Xiu Kan Yanfeng Zhao Department of Applied Mathematics Harbin University of Science and Technology School of Electronic and Electrical Engineering Shanghai University of Engineering Science College of Automation Harbin Engineering University Graduate Department Harbin University of Science and Technology

ISBN: (纸本)9781509046584

In this paper,we investigate the robust state estimation problem for a class of genetic regulatory networks(GRNs) subject to time-varying delays and parameter uncertainties via utilizing sampled-data *** substituting the continuous measurements,we use the sampled measurements to estimate the concentrations of mRNAs and *** on the extended Wirtinger inequality,a new discontinuous Lyapunov functional is *** using Jensen inequality and the Lower bounds theorem,a sufficient criterion is derived,which guarantees the globally robustly asymptotic stability of the augmented ***,the required state estimators can be designed by solving a set of linear matrix inequalities(LMIs).Finally,two numerical examples are provided to demonstrate the effectiveness and less conservatism of the obtained results.

关键词： GRNs sampled measurements time-varying delays parameter uncertainties Wirtinger inequality

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