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Influences of increasing gate stem height on DC and RF performances of InAlAs/InGaAs InP-based HEMTs

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chinese Physics B 2021年第1期30卷 586-592页

作者： zhi-Hang Tong Peng ding Yong-Bo Su Da-Hai Wang zhi {3. High-Frequency High-Voltage Device and Integrated Circuits Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of chinese Academic of sciences Beijing 100049China

The T-gate stem height of In Al As/In Ga As In P-based high electron mobility transistor(HEMT) is increased from165 nm to 2.0 nm. The influences of increasing the gate stem height on the direct current(DC) and radio frequency(RF)performances of device are investigated. A 12.-nm-long gate, 2.0-nm-high gate stem device exhibits a higher threshold voltage(Vth) of 60 m V than a 12.-nm-long gate devices with a short gate stem, caused by more Pt distributions on the gate foot edges of the high Ti/Pt/Au gate. The Pt distribution in Schottky contact metal is found to increase with the gate stem height or the gate length increasing, and thus enhancing the Schottky barrier height and expanding the gate length,which can be due to the increased internal tensile stress of Pt. The more Pt distributions for the high gate stem device also lead to more obvious Pt sinking, which reduces the distance between the gate and the In Ga As channel so that the transconductance(gm) of the high gate stem device is 70 m S/mm larger than that of the short stem device. As for the RF performances,the gate extrinsic parasitic capacitance decreases and the intrinsic transconductance increases after the gate stem height has been increased, so the RF performances of device are obviously improved. The high gate stem device yields a maximum ft of 2.0 GHz and fmax of 460 GHz, while the short gate stem device has a maximum ft of 2.0 GHz and the fmax of 3.0 GHz.

关键词： InP-based HEMT gate stem height Pt/Ti Schottky contact gate parasitic capacitances

Embryonic stem cells generated by nuclear transfer of human somatic nuclei into rabbit oocytes

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Cell Research 2003年第4期13卷 251-263页

作者： YING CHEN, zhi Xu HE, AILIAN LIU, KAI WANG, WEN WEI MAO, JIAN XIN CHU, YONG LU, ZHENG Fu FANG, YING TANG SHI, QING ZHANG YANG, DA YUAN CHEN, MIN RANG WANG, jin SONG LI, SHAO LIANG HUANG, XIANG YIN KONG, YAO ZHOU SHI, Zm QIANG WANG, JIA HuI XIA, zhi GAO LONG, zhi GANG XUE, WEN XIANG ding, HuI ZHEN SHENG Center for Developmental Biology, Shanghai Second Medical University, Shanghai 2.0092. China Laboratory of Stem Cell Biology, institute of Biochemistry and Cell Biology, Shanghai institutes for Biological {3., chinese Academy of {3., 1665 Kong Jiang Road, Shanghai 2.0092. China Center for Stem Cell Research, the Second Affiliated Hospital, Sun Yat-Sen University, Guangzhou 51012.,China State Key Laboratory of Reproductive Biology, institute of Zoology, chinese Academy of {3., 19 Zhong-guan Cun Road, Haidian District, beijing 100080, China Health Science Center, Shanghai institutes of Biological {3., chinese Academy of {3. and Shanghai Second Medical University, Shanghai 2.002., China National Laboratory of Medical Genetics, Central South University, 88 Xiangya Road, Changsha 410078, China Xinhua Hospital, Shanghai Second Medical University, 1665 Kong Jiang Road, Shanghai 2.0092. China Center for Developmental Biology Shanghai Second Medical University Shanghai 200092 China Laboratory of Stem Cell Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences 1665 Kong Jiang Road Shanghai 200092 China Center for Stem Cell Research the Second Affiliated Hospital Sun Yat-Sen University Guangzhou 510120 China State Key Laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences 19 Zhong-guan Cun Road Haidian District Beijing 100080 China Health Science Center Shanghai Institutes of Biological Sciences Chinese Academy of Sciences and Shanghai Second Medical University Shanghai 200025 China National Laboratory of Medical Genetics Central South University 88 Xiangya Road Changsha 410078 China Xinhua Hospital Shanghai Second Medical University 1665 Kong Jiang Road Shanghai 200092 China

To solve the problem of immune incompatibility, nuclear transplantation has been envisaged as a means to produce cells or tissues for human autologous transplantation. Here we have derived embryonic stem cells by the transfer of human somatic nuclei into rabbit oocytes. The number of blastocysts that developed from the fused nuclear transfer was comparable among nuclear donors at ages of 5, 42. 52.and 60 years, and nuclear transfer (NT) embryonic stem cells (ntES cells) were subsequently derived from each of the four age groups. These results suggest that human somatic nuclei can form ntES cells independent of the age of the donor. The derived ntES cells are human based on karyotype, isogenicity, in situ hybridization, PCR and immunocytochemistry with probes that distinguish between the various species. The ntES cells maintain the capability of sustained growth in an undifferentiated state, and form embryoid bodies, which, on further induction, give rise to cell types such as neuron and muscle, as well

关键词： nuclear transfer (NT) somatic cell nuclear transfer (SCNT) embryonic stem cells (ES cell) therapeutic cloning rabbit oocyte.

Optimized Chebyshev Fourier migration:A wide-angle dual-domain method for media with strong velocity contrasts

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Optimized Chebyshev Fourier migration:A wide-angle dual-doma...

An electromagnetic simulation assisted small signal modeling method for InP double-heterojunction bipolar transistors

中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： jin-Hai Zhang,Wei-Min Wang,Shu-Qin Wang,and Zhen-Xing Yao 1 chinese Academy of {2.,{3. of Geology and Geophysics,{3.,China. 2.chinese Academy of {2.,{3. of Tibetan Plateau Research,Key Laboratory of Continental Collision and Plateau Uplift,{3.,China. 3.Minzu University of China,{3. of Information Engineering,{3.,China.

A wide-angle propagator is essential when imaging complex media with strong lateral velocity contrasts in one-way wave-equation *** have developed a dual-domain one-way propagator using truncated Chebyshev polynomials and a globally optimized *** method increases the accuracy of the expanded square-root operator by adding two high-order terms to the traditional split-step Fourier ***,we approximate the square-root operator using Taylor expansion around the reference background ***,we apply the first-kind Chebyshev polynomials to economize the results of the Taylor ***,we optimize the constant coefficients using the globally optimized scheme,which are fixed and feasible for arbitrary velocity *** analysis and numerical experiments have demonstrated that the method has very high accuracy and exceeds the unoptimized Fourier finite-difference propagator for the entire range of practical velocity contrasts. The accurate propagation angle of the method is always about 60°under the relative error of 1%for complex media with weak,moderate,and even strong lateral velocity *** method allows us to handle wide-angle propagations and strong lateral velocity contrast simultaneously by using Fourier transform *** four 2. Fourier transforms are required for each step of 3. wavefield extrapolation,and the computing cost is similar to that of the Fourier finite-difference *** with the finite-difference method,our method has no two-way splitting error(i.e.,azimuthal-anisotropy error)for 3. cases and almost no numerical dispersion for coarse *** addition, it has strong potential to be accelerated when an enhanced fast Fourier transform algorithm emerges.

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chinese Physics B 2022年第6期31卷 717-724页

作者： Yanzhe Wang Wuchang ding Yongbo Su Feng Yang Jianjun ding Fugui Zhou {2. {3. School of Microelectronics University of Chinese Academy of SciencesBeijing 100049China High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

We present a convenient and practical electromagnetic(EM)assisted small-signal model extraction method for InP double-heterojunction bipolar transistors(DHBTs).Parasitic parameters of pad and electrode fingers are extracted by means of 3. EM *** simulations with a new excitation scheme are closer to the actual on-wafer measurement *** simulation settings are calibrated by comparing measurement and simulation of OPEN and SHORT structures.A simplerπ-type topology is proposed for the intrinsic model,in which the base-collector resistance Rμ,output resistance Rce are deleted,and a capacitance Cce is introduced to characterize the capacitive parasitic caused by the collector finger and emitter ground *** intrinsic parameters are all extracted by exact equations that are derived from rigorous *** method is characterized by its ease of implementation and the explicit physical meaning of extraction *** validations are performed at four biases for three InGaAs/InP HBT devices with 0.8×7μm,0.8×10μm and 0.8×15μm emitter,and quite good fitting results are obtained in the range of 0.1-50 GHz.

关键词： electromagnetic simulation InP double-heterojunction bipolar transistor parameter extraction small-signal modeling

Theoretical investigation on the cavitation bubble dynamics near three spherical particles based on Weiss theorem

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Journal of Hydrodynamics 2023年第6期35卷 1119-1130页

作者： Yu-ning Zhang zhi-ling ding {2.g-rong Hu Xiao-xiao Zheng Jia-xin Yu {2.-sen Hu College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing102249China beijing Key Laboratory of Process Fluid Filtration and Separation China University of Petroleum-BeijingBeijing102249China China Fire and Rescue institute Beijing102202China Key Laboratory of Power Station Energy Transfer Conversion and System(Ministry of Education) School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China

To research the dynamics of the cavitation bubble under the interaction of particle clusters,the bubble morphological evolutionary characteristics near three equal-sized spherical particles are theoretically explored in the present study based on the Weiss theorem and the velocity potential superposition *** three particles are arranged symmetrically,and the fluid velocity field near the three particles and the cavitation bubble is ***,the effects of the bubble-particle distance and the maximum radius of the cavitation bubble on the fluid velocity are investigated,and the contribution mechanisms of the fluid velocity field constituents are *** analysis has found that:(1)The fluid velocity between the bubble and the particle is lower than that at the other locations in both the growth and collapse phases,thus the bubble cannot always maintain a standard spherical shape.(2.The bubble-particle distance and the maximum radius of the cavitation bubble are the key parameters affecting the circumferential inhomogeneity of the radial velocity of the fluid around the *** larger the maximum radius or the smaller the bubble-particle distance is,the more visible the non-circularity of the bubble morphology.(3.The image bubbles and the linear sinks contribute oppositely to the fluid velocity field,and the presence of the image bubble reduces the fluid *** the low velocity region,the image bubble is the main mechanism contributing to the effect of the particle on the fluid velocity.

关键词： Particles-bubble effects velocity potential fluid velocity bubble morphology Weiss theorem

Principles and construction of MSD adder in ternary optical computer

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Science China(Information sciences) 2010年第11期53卷 2159-2168页

作者： jin Yi1, SHEN YunFu1, PENG JunJie1, XU ShiYi1, ding GuangTai1, YUE DongJian1 & YOU HaiHang{2.School of Computer Engineering & Science, Shanghai University, Shanghai, 2.0072.China 2.ational institute for Computational sciences, Oak Ridge, TN3.83., USA School of Computer Engineering & Science Shanghai University Shanghai China National institute for Computational sciences Oak Ridge USA

The two remarkable features of ternary values and a massive unit with thousands bits of parallel computation will make the ternary optical computer (TOC) with modified signed-digit (MSD) adder more powerful and e?cient than ever before for numerical calculations. Based on the decrease-radix design presented previously, a TOC can satisfy either a user requiring huge capacity for data calculations or one with a moderate amount of data, if it is equipped with a prepared adder. Furthermore, with the application of pipelined operations and the proposed data editing technique, the e?ciency of the prepared adder can be greatly improved, so that each calculated result can be obtained almost within one clock cycle. It is hopeful that by employing a MSD adder, users will be able to enter a new dimension with the creation of a new multiplier, new divider, as well as new matrix operator in a TOC in the near future.

关键词： ternary optical computer (TOC) modified signed-digit (MSD) adder pipeline computing data editing technique

Pea leafminer Liriomyza huidobrensis (Diptera: Agromyzidae) uses vibrational duets for efficient sexual communication

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Insect Science 2019年第3期26卷 510-522页

作者： jin Ge Jia-Ning Wei ding-Jie Zhang Chun Hi De-{2. Zheng Le Kang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing China University of chinese Academy of sciences Beijing China Key Laboratory of Zoological Systematics and Evolution Institute of Zoology Chinese Academy of Sciences Beijing China School of Instrumentation Science & Optoelectronics Engineering Beihang University Beijing China beijing institutes of Life Science Chinese Academy of Sciences Beijing China

The pea leafminer (Liriomyza huidobrensis) is a notorious pest of vegetables and ornamental plants worldwide. Despite a large number of studies on its biology and ecology, the courtship behavior and sexual communication of this species remain unclear. Here, we studied vibrational communication in the sexual interaction of the pea leafminer. On host plant leaves, females and males behaviorally displayed the bobbing-quivering alternation, which finally led to copulation. Moreover, records of laser vibrometry revealed threesignal duets underlying the behavioral alternation. Sexually mature males spontaneously emitted calls (MCs) to initiate the duets. The females rapidly responded to MCs by emitting replies (FRs) that are longer in duration. The FRs further triggered male replies (MRs) in their search for potential partners. Leafminer-produced vibrational signals convey efficient information to partners and generate pair formation on stretched substrates, such as plant leaves and nylon mesh, but cannot elicit responses on dense substrates, such as glass and plastic. Vibrational playbacks of both MCs and FRs can elicit replies in females and males, respectively. This study completely characterizes substrate-borne vibrational duets in a dipteran insect. The discovery of vibrational sex signals in the pea leafminer provides new insights for the development of novel approaches to control the pest and its relative species.

关键词： biotremology courtship behavior Liriomyza vibrational communication

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需求侧响应的算力网络调度策略研究

电信工程技术与标准化 2024年第1期37卷 36-41页

作者：周丹媛刘超清王志强丁亦志房永进中国移动通信集团有限公司北京100033 中国移动通信集团设计院有限公司北京100080 中国移动通信集团设计院有限公司江苏分公司南京211800

本文介绍了一种考虑需求侧响应的算力网络调度策略,包括算力系统调度方法、算力供给侧和需求侧的匹配、综合算力系统调度方法以及未来研究方向。通过将需求分类为可转移需求、可消减需求、可中断需求和不可消减需求,采用分时计价策略和... 详细信息

本文介绍了一种考虑需求侧响应的算力网络调度策略,包括算力系统调度方法、算力供给侧和需求侧的匹配、综合算力系统调度方法以及未来研究方向。通过将需求分类为可转移需求、可消减需求、可中断需求和不可消减需求,采用分时计价策略和可中断需求策略进行需求侧算力的调整,并调整各分布式数据中心设备算力的供给和边缘节点设备的接入,在满足综合算力系统的各约束前提下获得最低的系统总成本。该调度方法可以为算力网络系统的并网和智能调度提供一种新的思路。

关键词：算力网络需求侧响应综合算力系统调度

Organic-inorganic hybrid piezotronic bipolar junction transistor for pressure sensing

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Microsystems & Nanoengineering 2024年第3期10卷 229-244页

作者： Emad Iranmanesh Zihao Liang Weiwei Li Congwei Liao Shunyu jin Chuan Liu Kai Wang Shengdong Zhang Charalampos Doumanidis Gehan A.J.Amaratunga Hang Zhou Guangdong Provincial Key Laboratory of In-Memory computing Chips School of Electronic and Computer EngineeringPeking University Shenzhen Graduate SchoolShenzhen 518055P.R.China School of Mechanical Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063P.R.China State Key Laboratory of Microelectronics Device and Integrated technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029P.R.China Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 23000PR China School of Electronics and Information technology Sun Yat-sen UniversityNo.132 East Waihuan RoadGuangzhou 510006P.R.China Department of Mechanical Aerospaceand Biomedical EngineeringUniversity of South AlabamaShelby Hall3128MobileAL 36688USA Electrical Engineering Division Department of EngineeringUniversity of Cambridge9 JJ Thomson AvenueCambridge CB30FAUnited Kingdom Zhejiang University International CampusHainingChina

With the rapid development of the Internet of Things(IoTs),wearable sensors are playing an increasingly important role in daily monitoring of personal health and *** signal-to-noise-ratio has become the most critical performance factor to *** enhance it,on the one hand,good sensing materials/devices have been employed;on the other hand,signal amplification and noise reduction circuits have been ***,most of these devices and circuits work in an active sampling mode,requiring frequent data acquisition and hence,entailing high-power *** this scenario,a flexible and wearable event-triggered sensor with embedded signal amplification without an external power supply is of great ***,we report a flexible two-terminal piezotronic n-p-n bipolar junction transistor(PBJT)that acts as an autonomous and highly sensitive,current-and/or voltage-mediated pressure *** PBJT is formed by two back-to-back piezotronic diodes which are defined as emitter-base and collectorbase *** force exertion on the emitter side,as a result of the piezoelectric effect,the emitter-base diode is forward biased while the collector-base diode is reverse *** to the inherent BJT amplification effect,the PBJT achieves record-high sensitivities of 13..7 kPa^(-1)(current-based)and 88.66 kPa^(-1)(voltage-based)in sensing *** PBJT also has a fast response time of110 ms under exertion of dynamic stimuli ranging from a flying butterfly to a gentle finger ***,the PBJT advances the state of the art not only in terms of sensitivity but also in regard to being self-driven and autonomous,making it promising for pressure sensing and other IoT applications.

关键词： bipolar transistor IoT