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Calculation of Skin Depths and Eddy-Current Power Losses for Magnetic Position Sensors

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Journal of Materials Science & Technology 2000年第2期16卷 244-245页

作者： Chung-Ping Liu (Department of Electrical Engineering, Yuan Ze University, Chungli 320, Taiwan-China Yeong-Hwa Chang and Tsung-Kun Lin (Department of Electrical Engineering, Chung Cheng Institute of Technology, Taoyuan 335, Taiwan-China Kun-Tong Wu and Ch Department of Electrical Engineering Yuan Ze University Chungli 320 Taiwan Department of Electrical Engineering Chung Cheng Institute of Technology Taoyuan 335 Taiwan Department of Physics Fu-Jen Catholic University Taipei 242 Taiwan opto-electronics and systems labs. ITRI Hsinchu 310 Taiwan

We present a theoretic model to calculate skin depths and eddy-current power losses for a magnetic position sensor. Eddy-current, arised from the operation of an alternating-current excitation, induces secondary currents and fields between magnetic material and magnetic position sensor. In this paper, a magnetic position sensor system is simplified to be an outer-winding coil along the axial direction of a low carbon steel bar. The analytical model is derived from basic field and circuit theory considering a linear approximation for a nonlinear permeability. Thus the skin depths and eddy-current power losses from the model in eddy-current modeling techniques at various frequencies of an excited current source can be calculated. The proposed configuration is capable of predicting the skin depths and eddy-current power losses for a magnetic position sensor and has a consistence with experiments.

关键词： Calculation of Skin Depths and Eddy-Current Power Losses for Magnetic Position Sensors

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Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

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Science China(Information Sciences) 2024年第5期67卷 302-310页

作者： Jieyuan LIANG Zixing ZOU Junwu LIANG Di WANG Biao WANG Anshi CHU Jiali YI Cheng ZHANG Lizhen FANG Tian ZHANG Huawei LIU Xiaoli ZHU Dong LI Anlian PAN Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University School of Electronic Information and Electrical Engineering Changsha University School of Physics and Telecommunication Engineering Yulin Normal University Units Semiconductor Technology Co. Ltd. School of Physics and electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore have promising application prospects in high-performance electronics. However, the layer-controlled growth of 2D materials is still confronted with challenges such as poor repeatability between different labs.and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical vapor deposition process that can realize the growth of WS2sheets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3precursor to form intermediate WO3-xproducts with low-valence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2, which provides nucleation sites for the subsequent layer of WS2growth and leads to the vertical growth of WS2sheets. The growth mechanism is thoroughly investigated. Electrical transport measurements show that the produced bilayer WS2possesses a high carrier mobility(up to 58 cm2·V-1·s-1) and small subthreshold swing（estimated to be 148 mV/decade）,which are among the best reported results for TMDs produced using CVD.

关键词： WS2 thickness-controlled growth chemical vapor deposition additive carbon

LED Lighting Development in Taiwan

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LED Lighting Development in Taiwan

海峡两岸第十届照明科技与营销研讨会

作者： Yung S.Liu Jung-Tsung Hsu Jim Chi Nano-Photonics Center opto-electronics ＆ systems Laboratories （OES） Industrial Technology Research Institute （ITRI） Nano-Photonics Center opto-electronics ＆ systems Laboratories （OES） Industrial Technology Research Institute （ITRI） Nano-Photonics Center opto-electronics ＆ systems Laboratories （OES） Industrial Technology Research Institute （ITRI）

＜正＞ This paper reviews the current status of the solid state lighting technology development at the opto-electronics ＆ systems labs. （OES）, Industrial Technology Research Institute （ITRI） and discusses recent ... 详细信息

关键词： optoelectronics GaN solid state lighting LED compound semiconductor optoelectronics industry

Textured Asymmetric Membrane Electrode Assemblies of Piezoelectric Phosphorene and Ti_(3)C_(2)T_(x)MXene Heterostructures for Enhanced Electrochemical Stability and Kinetics in LIBs

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Nano-Micro Letters 2024年第4期16卷 394-414页

作者： Yihui Li Juan Xie Ruofei Wang Shugang Min Zewen Xu Yangjian Ding Pengcheng Su Xingmin Zhang Liyu Wei Jing‑Feng Li Zhaoqiang Chu Jingyu Sun Cheng Huang Volta and DiPole Materials labs College of EnergySoochow Institute for Energy and Materials InnovationS(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceKey Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical IndustrySoochow UniversitySuzhou 215006People’s Republic of China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013People’s Republic of China College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001People’s Republic of China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204People’s Republic of China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084People’s Republic of China High Density Materials Technology Center for Flexible Hybrid electronics Suzhou Institute of Electronic Functional Materials TechnologySuzhou Industrial Technology Research InstituteSuzhou 215151People’s Republic of China Institute of Advanced Materials and Institute of Membrane Science and Technology Jiangsu National Synergistic Innovation Center for Advanced MaterialsSuzhou Laboratory and Nanjing Tech UniversityNanjing 211816People’s Republic of China

Black phosphorus with a superior theoretical capacity(2596 mAh g^(-1))and high conductivity is regarded as one of the powerful candidates for lithium-ion battery(LIB)anode materials,whereas the severe volume expansion and sluggish kinetics still impede its applications in *** contrast,the exfoliated two-dimensional phosphorene owns negligible volume variation,and its intrinsic piezoelectricity is considered to be beneficial to the Li-ion transfer kinetics,while its positive influence has not been discussed ***,a phosphorene/MXene heterostructure-textured nanopiezocomposite is proposed with even phosphorene distribution and enhanced piezo-electrochemical coupling as an applicable free-standing asymmetric membrane electrode beyond the skin effect for enhanced Li-ion *** experimental and simulation analysis reveals that the embedded phosphorene nanosheets not only provide abundant active sites for Li-ions,but also endow the nanocomposite with favorable piezoelectricity,thus promoting the Li-ion transfer kinetics by generating the piezoelectric field serving as an extra *** waltzing with the MXene framework,the optimized electrode exhibits enhanced kinetics and stability,achieving stable cycling performances for 1,000 cycles at 2 A g^(-1),and delivering a high reversible capacity of 524 m Ah g^(-1)at-20℃,indicating the positive influence of the structural merits of self-assembled nanopiezocomposites on promoting stability and kinetics.

关键词： Phosphorene Nanopiezocomposite Piezo-electrochemical coupling Membrane electrode assembly Lithium-ion storage

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A New 2-D Digital Filter Using a Locally Broadcast Scheme and Its Cascade Form

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A New 2-D Digital Filter Using a Locally Broadcast Scheme an...

Electronic Communication systems--The 2000 IEEE Asia-Pacific Conference on Circuits and systems

作者： Lan-Da Van Shing Tenqchen Chi-Hong Chang Wu-Shiung Feng Lab 331 Department of Electrical EngineeringNational Taiwan University Also with Chunghwa Telecom Telecommunication labs. Department of electronics Engineering Chang Gung University

ISBN: (纸本)0780362535

＜正＞In this paper,we propose a new two-dimensional（2-D） systolic-array digital filter using locally broadcast scheme that is the hybrid of a modified reordering and another systolic *** architecture occupies locally broadcast,lower quantization error and zero latency without sacrificing the number of multipliers as well as delay elements under the accepted critical *** addition,the widely used 2-D cascaded systolic digital filter can be described and reconstructed by similar methodology.

关键词： two-dimensional digital filters systolic arrays cascade networks filtering theory IIR filters FIR filters 2D digital filter local broadcast scheme cascade form systolic array architecture modified reordering quantization error zero latency multipliers delay elements

Development of an adaptive array based on subband signal processing

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Development of an adaptive array based on subband signal pro...

2000年第五届国际天线、电波传播与电磁理论学术会议

作者： Yukihiro Kamiya acr.atr.co.jp Satoshi Denno acr.atr.co.jp Yoshihiko Mizuguchi acr.atr.co.jp Masaaki Katayama Akira Ogawa Yoshio Karasawa ATR Adaptive Commun. Res. labs. 2-2 Hikaridai Seikacho Sorakugun Kyoto 619-0288 Japan y-kamiya ATR Adaptive Commun. Res. labs. 2-2 Hikaridai Seikacho Sorakugun Kyoto 619-0288 Japan y-kamiya ATR Adaptive Commun. Res. labs. 2-2 Hikaridai Seikacho Sorakugun Kyoto 619-0288 Japan y-kamiya Department of Information electronics Nagoya University Department of Information electronics Nagoya University Department of Electrical Engineering The University of Electro-Communications

＜正＞ Adaptive arrays are recognized as a solution to multipath fading environments that can be a serious problem in high-speed mobile communication systems. However, huge computational loads are required due to its spatio-temporal signal processing. Subband signal processing has been known as a parallel signal processing scheme on the frequency domain. It allows us to allocate heavy computational loads to several processors when it is implemented in DSPs （Digital Signal Processor） or

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Analysis of Non-WSSUS Fading Dispersive Channel Model

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The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 20-25页

作者： ZHANG Ming ZHANG Jian-hua JIANG Jun ZHANG Ping WU Yu-fei Wireless Technology Innovation labs.(WTI) Beijing University of Posts and TelecommunieationsBeijing 100876 P.R. China Motorola (China)electronics Ltd. No. 4 Avenue Technology Development Zone Tianjin 301800 P.R. China

The Wide-Sense Stationary Uncorrelated Scattering （WSSUS） model has long been viewed as a basic channel model to describe the fading dispersive channel. But non- WSSUS models have more universal applicability when the wireless mobile channel with broadband is studied with finer and more detailed knowledge of propagation environments. So the four-Dimension （4-D） characteristics of channel, namely time, lag, frequency, and Doppler, should be studied together. In this paper, Wigner-Ville distribution of Time-Frequency （TF） domain is introduced to analyze channel in which the incidence rays are non-stationary and correlated with each other. Several channel models, according to different move modes of incidence rays, with time-varying Doppler shift are designed and 4-D Local Scattering Function （LSF） are computed and simulated respectively. Our simulation results show the LSF present asymmetric and non-periodic TF distri- bution for some symmetric and periodic move modes of incidence rays.

关键词： non- WSSUS channel stimulation local scattering function Wigner- Ville distribution Doppler shift

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High-confidence software evolution

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Science China(Information Sciences) 2016年第7期59卷 94-112页

作者： Qing GAO Jun LI Yingfei XIONG Dan HAO Xusheng XIAO Kunal TANEJA Lu ZHANG Tao XIE Key Laboratory of High Confidence Software Technologies Mo E Institute of Software School of Electronics Engineering and Computer Science Peking University NEC Laboratories America Inc. 3. Accenture Technology Labs 4. Department of Computer Science University of Illinois at Urbana-Champaign

Software continues to evolve due to changing requirements, platforms and other environmental pressures. Modern software is dependent on frameworks, and if the frameworks evolve, the software has to evolve as well. On the other hand, the software may be changed due to changing requirements. Therefore, in high-confidence software evolution, we must consider both framework evolution and client evolution, each of which may incur faults and reduce software quality. In this article, we present a set of approaches to address some problems in high-confidence software evolution. In particular, to support framework evolution, we propose a history-based matching approach to identify a set of transformation rules between different APIs, and a transformation language to support automatic transformation. To support client evolution for high-confidence software, we propose a path-exploration-based approach to generate tests efficiently by pruning paths irrelevant to changes between versions, several coverage-based approaches to optimize test execution, and approaches to locate faults and fix memory leaks automatically. These approaches facilitate high-confidence software evolution from various aspects.

关键词： software evolution high confidence software quality software development program analysis

Improved theoretical estimation of mechanical reliability of optical fibers

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Improved theoretical estimation of mechanical reliability of...

Asia-pacific Optical Communications 2004

作者： Masao Tachikura Yoshinori Kurosawa Yoshikazu Namekawa Photo-electronics Technology Research Center Advanced Technology Labs. Hitachi Cable Ltd. 5-1-1 Hitaka-cho Hitachi-shi Ibaraki-ken 319-1414 Japan Photo-electronics Technology Research Center Advanced Technology Labs. Hitachi Cable Ltd. 5-1-1 Hitaka-cho Hitachi-shi Ibaraki-ken 319-1414 Japan Optical Fiber Design Dept. Information Systems Group Hitachi Cable Ltd. 5-1-1 Hitaka-cho Hitachi-shi Ibaraki-ken 319-1414 Japan

We propose an enhanced theory that can be commonly applied to fiber reliability evaluations under various stress and failure probability levels, under prolonged stress and in stressed fiber distributi

关键词： mechanical reliability proof test failure probability bending radius static fatigue two-point bending optical fiber