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Trans-synaptic Neural Circuit-Tracing with Neurotropic Viruses

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Neuroscience Bulletin 2019年第5期35卷 909-920页

作者： Jiamin Li Taian Liu Yun Dong Kunio Kondoh Zhonghua Lu Guangdong Provincial Key Laboratory of Brain Connectome and Behavior The Brain Cognition and Brain Disease Institute Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China University of Chinese Academy of Sciences Beijing 100049 China Division of Endocrinology and Metabolism Department of Homeostatic Regulation National Institute for Physiological Sciences National Institute of Natural Sciences Myodaiji Okazaki Aichi 444-8585 Japan Japan Science and Technology Agency PRESTO Myodaiji Okazaki Aichi 444-8585 Japan

A central objective in deciphering the nervous system in health and disease is to define the connections of neurons. The propensity of neurotropic viruses to spread among synaptically-linked neurons makes them ideal for mapping neural Circuits. So far, several classes of viral neuronal tracers have become available and provide a powerful toolbox for delineating neural networks. In this paper, we review the recent developments of neurotropic viral tracers and highlight their unique properties in revealing patterns of neuronal connections.

关键词： Neurotropic virus Central nervous system Neural Circuit Trans-synaptic tracer Retrograde tracing Anterograde tracing

Caution in building a Burgers Circuit for studying secondary dislocations

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Journal of Materials Science & Technology 2019年第6期35卷 1192-1197页

作者： Wen-Sheng Xu Wen-Zheng Zhang Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

As the Burgers vector of a secondary dislocation may not conform to the translation vectors in the periodic pattern in a high-resolution transmission electron microscope(HRTEM) image, a Burgers Circuit directly constructed according to an HRTEM image may render a wrong Burgers vector. The HRTEM images of the habit plane(HP) of δ precipitate in an Inconel 718 alloy were re-examined by using different Burgers Circuits, as an example. Evidence is found for predicted secondary dislocation associated with a down step. The Burgers vector of the dislocation is 1/6[112]/1/3[001]δ, determined with the Burgers Circuit built on the reference of the displacement shift completely lattice(DSCL). It is consistent with both the calculated and the measured result of the major defects in the habit plane. Different Burgers vectors due to different Burgers Circuits were explained quantitatively. The present study has a general implication for the determination of the Burgers vectors of secondary interfacial dislocations in other systems.

关键词： Dislocation Burgers vector Burgers Circuit Coincidence site lattice (CSL) Displacement shift completely lattice (DSCL) Lattice correspondence

Heisenberg-Type Quantum Steering by Continuous Weak Measurement in Circuit QED

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Communications in Theoretical Physics 2019年第7期71卷 798-806页

作者：王众 Department of Physics Beijing Normal University

Quantum steering has attracted great interest in the last decade,especially in the celebrated optomechanical,cold atom,and quantum optical systems.However,there is still a lack of studies on quantum steering in Circuit quantum electrodynamics(QED),which provides a useful experimental platform for revealing novel quantum phenomena.In this work,we investigate the steering of qubit by continuous weak measurement in a Circuit QED system and establish a set of multiplicative steering inequalities based on the Heisenberg uncertainty principle.Different from the widely studied systems mentioned above,multiplicative steering inequalities in the Circuit QED system are in various forms.We find that only a portion of them can be used to show the detection dependence of the qubit state and we also analyze the reason.Furthermore,we discuss several conditions for the violation of a typical steering inequality,including the measurement strength and methods in detecting the cavity field as well as the quantum efficiency of the detector.This preliminary work could be helpful to quantum steering experiments in Circuit QED systems.

关键词： quantum steering Circuit quantum electrodynamics quantum weak measurement

Mobility impact on compensation performance of AMOLED pixel Circuit using IGZO TFTs

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Journal of Semiconductors 2019年第2期40卷 33-38页

作者： Congwei Liao Shenzhen Graduate School Peking University

The suitability of indium gallium zinc oxide(IGZO) thin-film transistors(TFT) for implementation of active matrix display of organic light emitting diodes(AMOLED) compensation pixel Circuits is addressed in this paper. In particular, the impact of mobility on compensating performance for the implementation in AMOLED pixel Circuits is investigated. Details of the effective mobility modeling using the power law of gate-to-source voltage are provided, and parameters are extracted according to the measured current-to-voltage data of IGZO TFT samples. The investigated AMOLED pixel Circuit consists of 4 switching TFTs, 1 driving TFT, and 1 capacitor. A "source-follower" structure is used for the threshold voltage extraction of the driving transistor. A new timing diagram is proposed; thus the current error of the pixel Circuit is almost independent of the effective mobility. But, to improve the precision of the threshold voltage extraction of the driving transistor, the mobility is required to be greater than5 cm^2 V^(-1) s^(-1). On the other hand, the optimized storage capacitance is reversely proportional to the effective mobility. Thus, the layout area of the pixel Circuit can be decreased from 100 × 100 to 100 × 68 μm2, with the effective mobility increased from 10 to50 cm^2 V^(-1) s^(-1). Therefore, IGZO TFT is a good alternative backplane technology for AMOLED displays, and a higher effective mobility is preferred for high compensation performance and compact layout.

关键词： IGZO TFT pixel Circuit mobility

Short-Circuit process model in underwater welding using rotating arc sensor

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China Welding 2017年第3期26卷 12-20页

作者：李志刚王业楷叶建雄 Key Laboratory of Ministry of Education for Conveyance and Equipment East China Jiaotong University Electrical and Mechanical School Nanchang Institute of Technology

In order to detecting and tracking along the weld seam with rotating arc sensor in underwater welding,the highpressure water environment rotating arc welding hardware platform is established and welding experiments using rotating arc sensor is done. Different radius of rotating arc sensor is used. And the corresponding welding current and voltage is obtained,which is compared with the results of rotating arc sensor short-Circuit process simulation model under high-pressure water environment established in this article. The results show that under high-pressure water environment,rotating arc radius should be optimized,otherwise the short-Circuit-arcing cycle will transit to a short-Circuit-arcing-abruption cycle,making the welding quality poor. At last the critical radius between the short-Circuit-arcing cycle and short-Circuit-arcing-abruption cycle under high-pressure water environment is obtained.

关键词： underwater welding high pressure water environment rotating arc sensor short Circuit process model optimization of rotating arc radius

Two-dimensional coupled vibration and equivalent Circuit of longitudinal-longitudinal orthogonal composite vibration direction converter

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Chinese Journal of Acoustics 2019年第1期38卷 62-72页

作者： XU Long ZHOU Jincheng CHANG Yan LI Fengming LI Weidong Department of Physics China Jiliang University

With the advantages of transmitting energy from multiple directions to one direction and transforming vibration from one source to multiple directions, the two-dimensional vibra?tion direction converter has important applications in power ultrasonic technology. However, for the complexity of using the wave equation to design and analysis the two-dimensional vibration direction converter, a concise equivalent Circuit for the converter is investigated. By introducing the two-dimensional mechanical coupling coefficient and the longitudinal force transform coef?ficient, and using the electromechanical analogy principle, the equivalent Circuit and resonance frequency equation of the two-dimensional vibration direction converter vibrating in anti-phase and in-phase two-dimensional coupled vibration are deduced. The resonance frequencies of the vibration direction converters of two different materials are calculated by using the proposed frequency equation, which are in agreement with the results from the finite element method and the experimental test. It provides a concise method for the design and applications of such ultrasonic vibration system.

关键词： Two-dimensional coupled vibration equivalent Circuit converter

Particle Swarm Optimization-Support Vector Machine Model for Machinery Fault Diagnoses in High-Voltage Circuit Breakers

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中国机械工程学报：英文版 2020年第1期33卷 104-113页

作者： Xiaofeng Li Shijing Wu Xiaoyong Li Hao Yuan Deng Zhao School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China

According to statistic data,machinery faults contribute to largest proportion of High-voltage Circuit breaker failures,and traditional maintenance methods exist some disadvantages for that issue.Therefore,based on the wavelet packet decomposition approach and support vector machines,a new diagnosis model is proposed for such fault diagnoses in this study.The vibration eigenvalue extraction is analyzed through wavelet packet decomposition,and a four-layer support vector machine is constituted as a fault classifier.The Gaussian radial basis function is employed as the kernel function for the classifier.The penalty parameter c and kernel parameterδof the support vector machine are vital for the diagnostic accuracy,and these parameters must be carefully predetermined.Thus,a particle swarm optimizationsupport vector machine model is developed in which the optimal parameters c andδfor the support vector machine in each layer are determined by the particle swarm algorithm.The validity of this fault diagnosis model is determined with a real dataset from the operation experiment.Moreover,comparative investigations of fault diagnosis experiments with a normal support vector machine and a particle swarm optimization back-propagation neural network are also implemented.The results indicate that the proposed fault diagnosis model yields better accuracy and e-ciency than these other models.

关键词： High-voltage Circuit breaker Machinery fault diagnosis Wavelet packet decomposition Support vector machine

Comparative study on flow and heat transfer characteristics of sinusoidal and zigzag channel printed Circuit heat exchangers

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Science China(Technological Sciences) 2020年第4期63卷 655-667页

作者： WEN Zhe-Xi LV Yi-Gao LI Qing School of Energy Science and EngineeringCentral South UniversityChangsha 410083China

Printed Circuit heat exchangers(PCHEs)are promising candidates for recuperators in supercritical CO2 Brayton cycles.A comparative study is given in this paper on the flow and heat transfer characteristics of PCHEs with sinusoidal and zigzag channels.With mass flow rates of 0.6–1.8 kg/h and the bend angles of 15°–30°,the thermal-hydraulic performance of the PCHEs is discussed.Results show that the sinusoidal channel is superior to the zigzag channel in its comprehensive performance.Larger bend angles result in greater reductions in pressure drop if sinusoidal channels are used instead of zigzag channels and a maximum of 48.4%reduction can be obtained in the considered working conditions.Meanwhile,the inlet sections should be carefully optimized since these sections account for up to 31%and 17%of the total pressure drop in the sinusoidal and zigzag channels,respectively.The corner shape of the zigzag channel can be specially designed to further reduce the pressure drop.The nonuniform density and heat flux distributions in both channels are found to be related to the periodic changes of flow directions and the centrifugal forces should not be ignored when optimizing the sinusoidal and zigzag channels.

关键词： printed Circuit heat exchanger supercritical CO2 thermal-hydraulic performance sinusoidal channel numerical simulation

Ultra-compact four-lane hybrid-integrated ROSA based on three-dimensional microwave Circuit design

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Chinese Optics Letters 2019年第3期17卷 1-6页

作者：赵泽平王姣姣韩雪妍张志珂刘建国 State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

An ultra-compact hybrid-integration receiver optical subassembly(ROSA) with four channels is demonstrated in our laboratory with the size of 23.3 mm × 6.0 mm × 6.5 mm. The ROSA is comprised of a planar lightwave Circuit(PLC) arrayed waveguide grating(AWG) chip, a top-illuminated positive-intrinsic-negative photodetector array chip, and a three-dimensional microwave Circuit that is specially designed for compact packaging. For each transmission lane, the -3 dB bandwidth of the ROSA is up to 20 GHz, and the maximum responsivity is up to 0.53 A/W. The proposed package structure can be used for smaller package sizes and would be an easy assembling solution for 100 GbE optical communication devices.

关键词： Ultra-compact four-lane hybrid-integrated ROSA three-dimensional microwave Circuit design