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Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model

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Nuclear Science and Techniques 2021年第12期32卷 89-102页

作者： Chong-Ju Hu Da-Li Yu mei-sheng He Hua-Ping mei Jie Yu Tao-sheng Li Institute of Nuclear Energy Safety Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Suzhou University Suzhou 234000China

Lithium heat pipes have broad applications in heat pipe cooling reactors and hypersonic vehicles owing to their ultra-high working *** particular,when the length of the lithium heat pipe is ultra-long,the flow and heat transfer characteristics are more *** this study,an improved lumped parameter model that considers the Marangoni effect,bending effect,and different vapor flow patterns and Mach numbers was ***after,the proposed model was verified using the University of New Mexico’s Heat Pipe and HTPIPE ***,the verified model was applied to simulate the steady-state operation of an ultra-long lithium heat pipe in a Heat PipeSegmented Thermoelectric Module Converters space *** on the results:(1)Vapor thermal resistance was dominant at low heating power and decreased with increasing heating *** vapor flow inside the heat pipe developed from the laminar to the turbulent phase,whereas the liquid phase in the heat pipe was always laminar.(2)The vapor pressure drop caused by bending was approximately 22–23%of the total,and the bending effect on the liquid pressure drop could be ignored.(3)The Marangoni effect reduced the capillary limit by hindering the liquid reflux,especially at low vapor *** considering the Marangoni effect,the capillary limit of the lithium heat pipe was overestimated by 9%when the vapor temperature was 1400 K.(4)The total thermal resistance of the heat pipe significantly increased with increasing adiabatic length when the vapor temperature was ***,the wick dryness increased with increasing adiabatic length at any vapor *** findings improve on current knowledge for the optimal design and safety analysis of a heat pipe reactor,which adopts ultra-long lithium heat pipes.

关键词： Lithium heat pipe Bending effect Marangoni effect Capillary limit Heat Pipe-Segmented Thermoelectric Module Converters(HP-STMC)

Sub-nanometer structured silicon-carbon composite nanolayers armoring on graphite for fast-charging and high-energy-density lithium-ion batteries

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Rare Metals 2023年第11期42卷 3692-3704页

作者： Zhen-Wei Li mei-sheng Han Jie Yu Songshan Lake Materials Laboratory Dongguan523808China Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenShenzhen 518055China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China

Silicon/carbon composites are promising alternatives to current graphite anodes in commercial lithiumion batteries(LIBs)because of their high capacity and excellent ***,the unsatisfactory fastcharging capability and cycle stability of Si/C composites caused by slow charge transport capability and huge volume change under industrial electrode conditions severely hamper their ***,a novel Si/C anode was fabricated by homogeneously depositing amorphous C-Si nanolayers on graphite(C-Si@graphite).C-Si nanolayers with uniformly dispersed sub-nanometer Si particles in 3D carbon skeleton significantly boost electron and Li-ion transport and efficiently relieve Si's agglomeration and volume *** a result,the tailored C-Si@graphite electrodes show an excellent rate capacity(760.3 mAh·g^(-1)at 5.0C)and long cycle life of over 1000 cycles at 1.0C and800 cycles at 2.0C under industrial electrode *** addition,the assembled full cells(C-Si@graphite,anode;Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2),cathode)present superior fastcharging capability(240.4 Wh·kg^(-1),charging for16.2 min,3.0C)and long cycle life(80.7%capacity retention after 500 cycles at 1.0C),demonstrating the massive potential of C-Si@graphite for practical application.

关键词： Si/C anode Sub-nanometer Si Fast-charging capability Lithium-ion batteries(LIBs)

Three Types of Expression in Dark-Soliton Perturbation Theory Based on Squared Jost Solutions

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Communications in Theoretical Physics 2007年第1期47卷 15-18页

作者： AO sheng-mei YAN Jia-Ren College of Physics and Information Science Hunan Normal University Changsha 410081 China

Three types of expression in the dark-soliton perturbation theory based on squared Jost solutions are invesgigaged in ghis paper. It is shown that there are three formally different results about the effects of perturbagion on a dark soliton, and it is proved by means of a transformation between two integral variables that they are essentially equivalent.

关键词： dark soliton perturbation theory squared Jost solution soliton velocity first-order correction

On the Seidel Integral Complete Multipartite Graphs

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 705-710页

作者： sheng-mei LV Liang WEI Hai-xing ZHAO Department of Mathematics Qinghai Nationality University Department of Mathematics Qinghai Normal University

For a simple undirected graph G, denote by λ（G） the （0, 1）-adjacency matrix of G. Let the matrix S（G） = J-I-2A（G） be its Seidel matrix, and let SG（A） = det（AI-S（G）） be its Seidel characteristic polynomial, where I is an identity matrix and J is a square matrix all of whose entries are equal to 1. If all eigenvalues of SG（λ） are integral, then the graph G is called S-integral, In this paper, our main goal is to investigate the eigenvalues of SG（A） for the complete multipartite graphs G = Kn1,n2,...,n,. A necessary and sufficient condition for the complete tripartite graphs Km,n,t and the complete multipartite graphs Km,.... m,n,...,n to be S-integral is given, respectively.

关键词： S-polynomial S-integral complete multipartite graphs

The Dynamics of a Bright-Bright Vector Soliton in Bose-Einstein Condensation

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Chinese Physics Letters 2012年第5期29卷 18-21页

作者： AN Jia-Ren ZHOU Jie AO sheng-mei Department of Physics Hunan Normal UniversityChangsha 410081

The dynamics of a bright-bright vector soliton in cigar-shaped Bose-Einstein condensate trapping in a harmonic potential is *** interaction between bright solitons in different species with small separation is *** the interaction between solitons of the same species,it is independent of the phase difference between the solitons,and may be of attraction or *** the former case,each soliton will oscillate about and pass through each other around the mass center of the system,which will also oscillate harmonically due to harmonic trapping potential.

关键词： harmonic soliton Einstein

Handwritten digit recognition based on ghost imaging with deep learning

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Chinese Physics B 2021年第5期30卷 367-372页

作者： Xing He sheng-mei Zhao Le Wang Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing 210003China

We present a ghost handwritten digit recognition method for the unknown handwritten digits based on ghost imaging(GI)with deep neural network,where a few detection signals from the bucket detector,generated by the cosine transform speckle,are used as the characteristic information and the input of the designed deep neural network(DNN),and the output of the DNN is the *** results show that the proposed scheme has a higher recognition accuracy(as high as 98%for the simulations,and 91%for the experiments)with a smaller sampling ratio(say 12.76%).With the increase of the sampling ratio,the recognition accuracy is *** with the traditional recognition scheme using the same DNN structure,the proposed scheme has slightly better performance with a lower complexity and non-locality *** proposed scheme provides a promising way for remote sensing.

关键词： ghost imaging handwritten digit recognition ghost handwritten recognition deep learning

Imaging a periodic moving/state-changed object with Hadamard-based computational ghost imaging

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Chinese Physics B 2022年第8期31卷 391-398页

作者： Hui Guo Le Wang sheng-mei Zhao Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China College of Information Engineering Fuyang Normal UniversityFuyang 236037China

We propose a method for imaging a periodic moving/state-changed object based on computational ghost imaging with Hadamard speckle patterns and a slow bucket detector, named as PO-HCGI. In the scheme, speckle patterns are produced from a part of each row of a Hadamard matrix. Then, in each cycle, multiple speckle patterns are projected onto the periodic moving/state-changed object, and a bucket detector with a slow sampling rate records the total intensities reflected from the object as one measurement. With a series of measurements, the frames of the moving/state-changed object can be obtained directly by the second-order correlation function based on the Hadamard matrix and the corresponding bucket detector measurement results. The experimental and simulation results demonstrate the validity of the PO-HCGI. To the best of our knowledge, PO-HCGI is the first scheme that can image a fast periodic moving/state-changed object by computational ghost imaging with a slow bucket detector.

关键词： ghost imaging periodic moving object periodic state-changed object Hadamard matrix

Dynamics and screening characteristics of a vibrating screen with variable elliptical trace

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Mining Science and Technology 2009年第4期19卷 508-513页

作者： HE Xiao-mei LIU Chu-sheng School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

The ideal motion characteristics for the vibrating screen was presented according to the principle of screening process with constant bed thickness.A new vibrating screen with variable elliptical trace was *** accurate mechanical model was constructed according to the required structural motion *** multi-degree-of-freedom vibration theory,characteristics of the vibrating screen was *** parameters of the vibrating screen which motion traces were linear,circular or elliptical were *** stable solutions of the dynamic equations gave the motions of the vibrating screen by means of computer *** parameters,including amplitude,movement velocity and throwing index,of five specific points along the screen surface were gained by theoretical *** results show that the traces of the new designed vibrating screen follow the ideal screening *** screening efficiency and processing capacity may thus be effectively improved.

关键词： variable elliptical trace screening process with constant bed thickness dynamic model motion characteristic screening characteristics

Density Matrix for Mesoscopic Distributed Parameter Circuits

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Communications in Theoretical Physics 2005年第3期43卷 547-550页

作者： JIYing-Hua WANGQi LUOHai-mei LEIMin-sheng DepartmentofPhysics JiangxiNormalUniversityNanchang330027China

Under the Born-von-Karmann periodic boundary condition, we propose a quantization scheme for non-dissipative distributed parameter circuits (i.e. a uniform periodic transmission line). We find the unitary operator for diagonalizing the Hamiltonian of the uniform periodic transmission line. The unitary operator is expressed in a coordinate representation that brings convenience to deriving the density matrix rho(q,q',beta). The quantum fluctuations of charge and current at a definite temperature have been studied. It is shown that quantum fluctuations of distributed parameter circuits, which also have distributed properties, are related to both the circuit parameters and the positions and the mode of signals and temperature T. The higher the temperature is, the stronger quantum noise the circuit exhibits.

关键词： mesoscopic distributed parameter circuits density matrix quantum fluctuations