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KINETIC STUDY OF SPINEL LiMn_2O_4 SYNTHESIz.D BY SOLID REACTION WITH SOFT-CHEMICAL METHOD

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 512-518页

作者： C.Q. Xu Y. W. Tian Y. C. z.ai z.J. Guo z. Q. huang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The differential thermal analysis （DTA） curves were measured at different heating rates in flowing air for studying the synthesis of the spinel LiMn2O3 with Li2CO3 and MnO2, The reaction began at about 503K, and finished at about 873K. The apparent activation energy of Kissinger method was about ***^-1, the reaction orderwas 1.67, the frequency factor was 7.81×10^9, and therefore the dinetic epuation was dδ/dt=A·exp（- E/RT）·（1-δ）^n=7.81×10^9, exp（-122770/RT）·（l-δ）^1.67 . Coats-Redfem integral method was used to analyz. the DTA curves of the samples at different heating rates, and the calculated apparent activation energy and frequency factor were 112. 13kJ· mol^-1 and 1.18 × 10^9, respectively, rather close to that of Kissinger method. X-ray diffraction （XRD） and scanning electron microscope （SEM） results shown that the synthesiz.d LiMn2O3 possesses pure phase, regular shape and normal particle distribution.

关键词： lithium manganese oxides synthesiz.d kinetics Kissinger method,Coats-Redfern integral method

A Study on Dimension Synthesis for the Peaucellier Mechanism

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Journal of Mechanics Engineering and Automation 2012年第5期2卷 271-278页

作者： Jessica Buckley Ming z. huang Department of Engineering University of San Diego San Diego 92110 USA

Straight-line motion, albeit simple, manifests itself in numerous applications, from running steam engines and oil wells to manufacturing parts with straight edges and sides. The drive to maximiz. production creates a need for continuously running assembly-line manufacturing comprised of precise, individually optimiz.d components. While there are many so-called straight-line generating mechanisms, few actually produces a true straight-line, most generate only approximate straight-line. Featured an eight-link rhomboidal system with length constraints,, the Peaucellier mechanism is one that actually produces a true straight line intrinsically. This paper presents a study on the dimension synthesis of the Peaucellier mechanism, namely by identifying the correct ratio of linkage lengths to produce the longest straight line stroke. In addition to designing for stroke, another objective of interest is to attain a desired velocity profile along the path. Kinematic analysis of the velocity profile on the mechanism will render the creation of input angular velocity standards based on desired stroke speed. Given the stroke and velocity specifications, specific steps to siz. the dimensions of the mechanism developed as result of this study will be presented.

关键词： Dimension synthesis straight-line mechanism Peaucellier mechanism.

Supplemental Materials: Realiz.tion of Quantum Maxwell's Demon with Solid-State Spins

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Chinese Physics Letters 2018年第4期35卷 1-6页

作者： W.-B. Wang X.-Y. Chang F. Wang P.-Y. Hou Y.-Y. huang W.-G. z.ang X.-L. Ouyang X.-z. huang z.-Y. z.ang H.-Y. Wang L. He L.-M. Duan Center for Quantum Information IIIS Tsinghua University Beijing 100084 Department of Physics University of Michigan Ann Arbor Michigan 48109 USA

We report experimental realiz.tion of a quantum version of Maxwell＇s demon using solid state spins where the information acquiring and feedback operations by the demon are achieved through conditional quantum gates.A unique feature of this implementation is that the demon can start in a quantum superposition state or in an entangled state with an ancilla observer. Through quantum state tomography, we measure the entropy in the system, demon, and the ancilla, showing the influence of coherence and entanglement on the result. A quantum implementation of Maxwell＇s demon adds more controllability to this paradoxical thermal machine and may find applications in quantum thermodynamics involving microscopic systems.

关键词： Maxwell Realiz.tion of Quantum Maxwell’s Demon with Solid-State Spins

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Application of Piez.electric Actuator and Compliant Structures to Achieve Flapping Wing Motion for a MAV

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材料科学与工程学报 2008年第4期26卷 642-646,515页

作者： Kranti. K. Lal Kummari S. J. Croucher N. J. Lawson E. E. Liani G. Allegri S. Guo Hsien-Chun Chung z. huang School of Applied Science Cranfield University Cranfield Bedfordshire MK43 0AL United Kingdom

Micro Aerial Vehicles(MAVs) are the smallest artificial *** of the flapping wings MAVs are powered by electric motors of various *** report in this paper the application of piez.electric actuators as power system for a flapping wing MAV using a compliant displacement amplification *** actuator used for this application is a pre-stressed cut piece of TH-7R type Thunder actuator.A two-bar compliant mechanism with two flexures has been developed to convert the linear displacement into angular movement and *** specimens were made from carbon fiber links and nylon *** also proposed to use the product of frequency(F) and tip displacement(D), F * D as a criteria for the characteriz.tion of an amplifying *** best specimen according to this criterion is obtained for a 5mm length flexure specimen made of three layers of *** F*D value obtained for this specimen was(0.58) *** finite element analysis results for different flexural thickness and lengths were obtained and have been compared to the experimental *** effect of both the thickness and length of the flexure on a particular arrangement has been discussed.

关键词：平板翼扑翼式微飞行器飞行技术控制方法材料结构

Granger causal representation learning for groups of time series

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Science China(Information Sciences) 2024年第5期67卷 56-68页

作者： Ruichu CAI Yunjin WU Xiaokai huang Wei CHEN Tom z.J.FU z.ifeng HAO School of Computer Science Guangdong University of Technology Peng Cheng Laboratory College of Science Shantou University

Discovering causality from multivariate time series is an important but challenging *** existing methods focus on estimating the Granger causal structures among multivariate time series,while ignoring the prior knowledge of these time series, e.g., the group of the time series. Focusing on discovering the Granger causal structures among groups of time series, we propose a Granger causal representation learning method to solve this problem. First, we use the multiset canonical correlation analysis method to learn the Granger causal representation of each group of time series. Then, we model the Granger causal relationships among the learned Granger causal representations using a recurrent neural network with temporal information. Finally, we formulate the above two stages into one unified optimiz.tion problem, which is efficiently solved using the augmented Lagrangian method. We conduct extensive experiments on synthetic and real-world datasets to validate the correctness and effectiveness of the proposed method.

关键词： Granger causal discovery Granger causal representation learning time series data recurrent neural network multiset canonical correlation analysis

Two- and Three-particle Correlations in a Partonic Transport Model

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Two- and Three-particle Correlations in a Partonic Transport...

Transient Characteristics and Accommodative Current Limiting Strategy for Bidirectional Interlinking Converters in Hybrid AC/DC Microgrids

中国物理学会高能物理分会第七届学术年会理论分会场

作者： Y.G. Ma, G.L. Ma, S. z.ang, X. z. Cai, H. z. huang et al.Shanghai Institute of Applied Physics, CAS

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1575-1588页

作者： Xia Shen z.ikang Shuai Wen huang Chao Shen Yang Shen z.John Shen College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616 USA

Bidirectional interlinking converter(BIC)is the core equipment in a hybrid AC/DC microgrid connected between AC and DC ***,the variety of control modes and flexible bidirectional power flow complicate the influence of AC faults on BIC itself and on DC sub-grid,which potentially threaten both converter safety and system *** study first investigates AC fault influence on the BIC and DC bus voltage under different BIC control modes and different pre-fault operation states,by developing a mathematical model and equivalent sequence ***,based on the analysis results,a general accommodative current limiting strategy is proposed for BIC without limitations to specific mode or operation *** amplitude is predicted and constrained according to the critical requirements to protect the BIC and relieving the AC fault influence on the DC bus *** with conventional methods,potential current limit failure and distortions under asymmetric faults can also be ***,experiments verify feasibility of the proposed method.

关键词： Bidirectional interlinking converter current limiting fault characteristic hybrid AC/DC microgrid variation/oscillation of DC bus voltage

MECHANICAL TENSILE BEHAVIOR AND MICROSTRUCTURE EVOLUTION FOR POLY(VINYLIDENE FLUORIDE-TRIFLUORETHYLENE) COPOLYMER THIN FILMS

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MECHANICAL TENSILE BEHAVIOR AND MICROSTRUCTURE EVOLUTION FOR...

Construction of 2D/2D Ti_(3)C_(2)T_(x)MXene/CdS heterojunction with photothermal effect for efficient photocatalytic hydrogen production

中国力学学会学术大会'2005

作者： Fang F z.ang M z. huang J F (Department of Engineering Mechanics, FML, Tsinghua University, Beijing, 100084, China)

Ferroelectric materials form one important class of the functional materials. In recent years there has been increasing recognition of the importance of polymeric ferroelectric materials. Compared with ferroelectric ceramics or single crystals, polymeric ferroelectric materials show those advantages of lower density, easier processing, more flexible and easier to compliant with different forms of surfaces. Their lower mechanical and acoustic impedance also makes them good candidates as sensors and transducers in ultrasonic cardiac image, blood pressure and pulse measurements, touch sensors in robotics, etc. Among them, copolymers of vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) are materials of great interest because of their outstanding dielectric and ferroelectric behavior.

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Journal of Materials Science & Technology 2024年第4期171卷 1-9页

作者： T.Y.huang z.Yang S.Y.Yang z.H.Dai Y.J.Liu J.H.Liao G.Y.z.ong z.J.Xie Y.P.Fang S.S.z.ang Key Laboratory for Biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Chemical Engineering and Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semiconductors to visible and infrared light is a key constraint on the utiliz.tion of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semiconductor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/CdS heterojunction catalyst is obtained by in-situ epitaxial growth of two-dimensional(2D)CdS nanosheets on 2D MXene interface via a solvothermal *** exceptional light absorption properties of MXene confer outstanding full-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure effectively mitigated the recombination of photogenerated carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃under visible light irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irradiation of visible and near infrared light,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of CdS *** study introduces a novel approach for constructing full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrogen evolution research.

关键词： Two-dimensional structure Heterostructure Photothermal effect Photocatalyst Hydrogen evolution