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Acta Metallurgica Sinica(English Letters) 2018年第1期31卷 105-112页

作者： Li-Fang Zheng Lu-Ning wang Zhao-zhong wang Li wang School of Mechanical Engineering University of Science and Technology Beijing School of Materials Science and Engineering University of Science and Technology Beijing

Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the 3,-ray irradiation on the fatigue strength, thermal conductivities and thermal stabilities of the glass fibres/epoxy resins composites were investigated. And a two-parameter fatigue life model was established to predict the fatigue life of the composites. Results revealed that the y-ray irradiation could probably result in the degradation of epoxy resins, but hardly damage to the glass fibres. And the γ-ray irradiation treatment could significantly affect the fatigue strength of the composites at a low-cycle fatigue stage, but seldom influence at a high-cycle fatigue stage. Furthermore, the fabricated glass fibres/epoxy resins composites after the γ-ray irradiation still presented excellent fatigue strength, ideal thermal conductivities, remarkable dimensional and thermal stabilities, which can meet the actual requirements of normal operation for supporting instruments under high-energy and nuclear physics experiments.

关键词： Epoxy resins composites Glass fibres Fatigue strength γ-Ray irradiation Thermal stabilities

Shape Memory Effect of an Aged Fe-Mn-Si-Co-Mo Alloy

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Journal of Materials Science & Technology 1998年第2期14卷 182-184页

作者： wang, zhong Cai, Wei Zhao, Liancheng Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The effect of ageing on the microstructure, mechanical properties and shape memory effect (SME) in a newly developed Fe-24Mn-5Si-8Co-4Mo shape memory alloy has been studied. It was found that Fe//2Mo particles precipitate during ageing and thereby increase hardness and strength of the alloy. The SME of the alloy can be remarkably improved by ageing, and a maximum SME can be obtained when aged at 873 K. When the ageing temperature is over 873 K, the SME decreases with increasing the ageing temperature. The reason for the improvement of SME by ageing in the Fe-Mn-Si-Co-Mo alloy was discussed. (Edited author abstract) 9 Refs.

关键词： Shape memory effect

Perovskite-based color camera inspired by human visual cells

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Light(Science & Applications) 2023年第2期12卷 294-303页

作者： Yujin Lu zhong Ji Guobiao Cen Hengchao Sun Haibao wang Chuanxi Zhao zhong Lin wang Wenjie Mai Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsGuangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsGuangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhouGuangdong 510632China Guangzhou Institute of Technology Xidian UniversityGuangzhouGuangdong 510555China Bejing Smart-Chip Microelectronics Technology Co. Ltd.Bejing 100192China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBejing 100083China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

There are two primary types of photoreceptor cells in the human eye:cone cells and rod cells that enable color vision and night vision,***,inspired by the function of human visual cells,we develop a high-resolution perovskite-based color camera using a set of narrowband red,green,blue,and broadband white perovskite photodetectors as imaging *** narrowband red,green,and blue perovskite photodetectors with color perceptions mimic long-,medium-,and short-wavelength cones cells to achieve color imaging ***,the broadband white perovskite photodetector with better detectivity mimics rod cells to improve weak-light imaging *** perovskite-based camera,combined with predesigned pattern illumination and image reconstruction technology,is demonstrated with high-resolution color images(up to 256 x 256 pixels)in diffuse *** is far beyond previously reported advanced perovskite array image sensors that only work in monochrome transmission *** work shows a new approach to bio-inspired cameras and their great potential to strongly mimic the ability of the natural eve.

关键词： visual perovskite image

A framework of region-based dynamic image fusion

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 56-62页

作者： wang zhong-hua QIN Zheng LIU Yu Department of Computer Science and Technology Tsinghua University Beijing 100084 China

A new framework of region-based dynamic image fusion is proposed. First, the technique of target detection is applied to dynamic images (image sequences) to segment images into different targets and background regions. Then different fusion rules are employed in different regions so that the target information is preserved as much as possible. In addition, steerable non-separable wavelet frame transform is used in the process of multi-resolution analysis, so the system achieves favorable characters of orientation and invariant shift. Compared with other image fusion methods, experimental results showed that the proposed method has better capabilities of target recognition and preserves clear background information.

关键词： Dynamic image fusion Region segmentation Non-separable wavelet frame

Phase diagram characterized by transmission in a triangular quantum dot

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Chinese Physics B 2018年第11期27卷 575-580页

作者： Jin Huang and Wei-zhong wang Department of Physics Wuhan University Wuhan 430072 China

We propose a theoretical model to detect the quantum phase transition in a triangular quantum dot molecule with frustration. The boundaries of the phase diagram are accurately determined by the transmission. For small frustration t, as the interdot Coulomb repulsion V increases, the system undergoes a Kosterlitz–Thouless（KT） transition from the Kondo resonance state with a transmission peak at zero energy to the Coulomb blocked state with zero transmission, which is followed by a first transition to the V-induced resonance（VIR） state with unitary transmission. For large frustration t, as V increases, the orbital spin singlet without transmission transits to the VIR state through a KT transition.

关键词： quantum dots quantum phase transition Kondo effect transmission

Magnetometer-only linear attitude estimation for bias momentum pico-satellite

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第6期11卷 455-464页

作者： Ke HAN Hao wang zhong-he JIN Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

Satellite attitude information is essential for pico-satellite applications requiring light-weight,low-power,and fast-computation *** objective of this study is to provide a magnetometer-only attitude estimation method for a low-altitude Earth orbit,bias momentum *** on two assumptions,the spacecraft spherical symmetry and damping of body rates,a linear kinematics model of a bias momentum satellite's pitch axis is derived,and the linear estimation algorithm is *** algorithm combines the linear Kalman filter(KF) with the classic three-axis attitude determination method(TRIAD).KF is used to estimate satellite's pitch axis orientation,while TRIAD is used to obtain information concerning the satellite's three-axis *** tests confirmed that the algorithm is suited to the time-varying model errors resulting from both *** estimate result keeps tracking satellite attitude motion during all damping,stable,and free rotating control *** with nonlinear algorithms,such as extended Kalman filer(EKF) and square root unscented Kalman filer(SRUKF),the algorithm presented here has an almost equal performance in terms of convergence time and estimation accuracy,while the consumption of computing resources is much lower.

关键词： Pico-satellite Attitude estimation Bias momentum Magnetometer Kalman filter(KF)

Finite element analysis of stiffness and static dent resistance of aluminum alloy double-curved panel in viscous pressure forming

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Transactions of Nonferrous Metals Society of China 2009年第S02期19卷 312-317页

作者： LI Yi wang zhong-Jin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The static dent resistance performance of the aluminum alloy double-curved panel formed using viscous pressure forming (VPF)was studied by finite element analysis,which mainly considers the forming process *** whole simulation consisting of three stages,i.e.,forming,spring-back and static dent resistance,was carried out continuously using the finite element code *** influence of blank holder pressure(BHP)and the drawbead on the stiffness and the static dent resistance of the panels formed using VPF was *** results show that the adequate setting of the drawbead can increase the plastic deformation of the double-curved panel,which is beneficial to the initial stiffness and the static dent *** is an optimum BHP range for the stiffness and the static dent resistance.

关键词： aluminum alloy double-curved panel viscous pressure forming panel stiffness static dent resistance finite element analysis

Grouped DCT precoding for PAPR reduction in optical direct detection OFDM systems

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Optoelectronics Letters 2013年第3期9卷 213-216页

作者： wang zhong-peng ZHANG Shao-zhong School of Information and Electronic Engineering Zhejiang University of Science and Technology Hangzhou310023 China State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Faculty of Electronic and lnformation Engineering Zhejiang Wanli University Ningbo 315100 China

A new grouped precoding technique based on discrete cosine transform (DCT) is presented for peak to average power ratio (PAPR) reduction of optical intensity modulated/direct detection (IM/DD) orthogonal frequency division multiplexing (OFDM) system. The computational complexity of the scheme is reduced by at least about 15% compared with that of the ordinary DCT precoding scheme when the number of groups is 2. The PAPR with this method can be reduced by about 0.8 dB. Meantime, compared with original OFDM, the bit error rate (BER) performance of system is improved. So the proposed scheme for reducing PAPR is very effective in optical IM/DD OFDM systems.

关键词： OFDM系统 PAPR DCT 分组预编码正交频分多路技术峰均功率比测光

Gauge-meter model building based on the effect of elastic deformation of rolls in a plate mill

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Journal of University of Science and Technology Beijing 2007年第4期14卷 381-386页

作者： Xianlei Hu Zhaodong wang zhong Zhao Xianghua Liu Guodong wang State Key Laboratory of Rolling Technology and Automation of Tandem Rolling Northeastern University Shenyang 110004 China

The calculation error of the gauge-meter model will affect the gap setting precision and the self-learn precision of rolling force. The precision of the gauge-meter model is strongly influenced by plate width, working roll radius, backup roll radius, working roll crown, backup roll crown, and rolling force. The influence rules are hard to get by measuring. Taking a conventional 4-h plate mill as the research subject, these influences were transferred into the calculation of roll deflection and flattening deformation. To calculate these deformations, the theory of the influence function method was adopted. By modifying the traditional gauge-meter model, a novel model of the effect of roll elastic deformation on the gap setting was built by data fitting. By this model, it was convenient to analyze the variation caused by the rolling condition. Combining the elastic deformation model of rolls with the kiss-rolls method, a gauge-meter model was put forward for plate thickness prediction. The prediction precision of thickness was greatly improved by the new gauge- meter model.

关键词： gauge meter influence function roll elastic deformation plate flattening

Ultralight Iontronic Triboelectric Mechanoreceptor with High Specific Outputs for Epidermal Electronics

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Nano-Micro Letters 2022年第6期14卷 1-14页

作者： Hai Lu wang Zi Hao Guo Xiong Pu zhong Lin wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China CUSTech Institute of Technology Wenzhou 325024ZhejiangPeople’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The pursuit to mimic skin exteroceptive ability has motivated the endeavors for epidermal artificial *** mechanoreceptors are required to be highly sensitive to capture imperceptible skin deformations and preferably to be self-powered,breathable,lightweight and deformable to satisfy the prolonged wearing *** is still struggling to achieve these traits in single device,as it remains difficult to minimize device architecture without sacrificing the sensitivity or *** this article,we present an all-fiber iontronic triboelectric mechanoreceptor(ITM)to fully tackle these challenges,enabled by the high-output mechano-to-electrical energy *** proposed ITM is ultralight,breathable and stretchable and is quite stable under various mechanical *** the one hand,the ITM can achieve a superior instantaneous power density;on the other hand,the ITM shows excellent sensitivity serving as epidermal *** health status monitoring is readily implemented by the ITM calibrating by detecting vital signals and physical activities of human *** ITM can also realize acoustic-to-electrical conversion and distinguish voices from different people,and biometric application as a noise dosimeter is *** ITM therefore is believed to open new sights in epidermal electronics and skin prosthesis fields.

关键词： Ultralight Iontronic Triboelectric mechanoreceptor Power density Epidermal electronics