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evaporating Temperature Uniformity of the Pulsating heat Pipe with Surfactant Solutions at Different Concentrations

Journal of Thermal Science 2023年第1期32卷 183-191页

作者： BAO Kangli WANG Xuehui ZhanG Peng-e han Xiaohong TAN Jianming State Key Laboratory of Air-Conditioning equipment and System energy Conservation GREE Electric Appliances Inc.of ZhuhaiZhuhai 519070China Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou 310027China

The evaporating section of the pulsating heat pipe(PhP)is in direct contact with the electronics when it is used for heat dissipation,and thus the evaporating temperature uniformity has an important effect on the safe and reliable operation of electronic *** the basis of these conditions,an experimental study on the evaporating temperature uniformity of the PhP with surfactant solutions at different concentrations was conducted at the heat fluxes of(1911–19427)W/m^(2).Sodium stearate was utilized for the solute;the surfactant solutions were prepared with the concentrations of 0.001 wt%,0.002 wt%,and 0.004 wt%,respectively,and the filling ratios of the PhP were 0.31,0.44 and 0.57,*** experimental results revealed that under all tested working conditions,the highest temperature always appeared in the intermediate zone of the evaporating *** the heat flux increased,the temperature differences among different zones rose initially and then reduced due to the change of the flow motion and the flow *** evaporating temperature uniformity of the sodium stearate solutions-PhP was better than that of the deionized water-PhP,which suggested that the evaporating temperature uniformity might be improved through decreasing the surface ***,combined with the effect of surface tension and viscosity,for different filling ratios,the required concentration was different when the best evaporating temperature uniformity was *** be specific,when the filling ratio were 0.31 and 0.44,the best evaporating temperature uniformity was achieved at the concentration of 0.004 wt%,while at the filling ratio of 0.57,the best evaporating temperature uniformity was attained at the concentration of 0.002 wt%.

关键词： pulsating heat pipe surface tension evaporating temperature uniformity heat transfer

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A PARAMeTeR-UNIFORM TAILOReD FINITe POINT MeThOD FOR SINGULARLY PeRTURBeD LINeAR ODe SYSTeMS＊

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Journal of Computational Mathematics 2013年第4期31卷 422-438页

作者： houde han J.J.h. Miller Min Tang Department of Mathematical Sciences Tsinghua University Beijing 100084 China Department of Mathematics Trinity College Dublin 2 Ireland Key Laboratory of Scientific and engineering Computing Department of Mathematics and Institute of Natural Sciences Shanghai Jiao Tong University Shanghai 200240 China

In scientific applications from plasma to chemical kinetics, a wide range of temporal scales can present in a system of differential equations. A major difficulty is encountered due to the stiffness of the system and it is required to develop fast numerical schemes that are able to access previously unattainable parameter regimes. In this work, we consider an initial-final value problem for a multi-scale singularly perturbed system of linear ordi- nary differential equations with discontinuous coefficients. We construct a tailored finite point method, which yields approximate solutions that converge in the maximum norm, uniformly with respect to the singular perturbation parameters, to the exact solution. A parameter-uniform error estimate in the maximum norm is also proved. The results of numerical experiments, that support the theoretical results, are reported.

关键词： Tailored finite point method Parameter uniform Singular perturbation ODesystem.

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Collapse assessment of steel moment frames using endurance time method

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earthquake engineering and engineering Vibration 2015年第2期14卷 347-360页

作者： e.Rahimi h.e.estekanchi Department of Civil engineering Sharif University of Technology (SUT)

In endurance time(eT) method structures are subjected to a set of predesigned intensifying excitations. These excitations are produced in a way that their response spectrum, while complying with a specifi ed spectrum, intensifi es with time so they can be used approximately to simulate the average effects of several ground motions scaled to different intensities. In this paper applicability of the eT method for evaluating collapse potential of buildings is investigated. A set of four steel moment frames is used for collapse assessment. The process of using eT method in collapse evaluation is explained and the results are compared with incremental dynamic analysis(IDA) results. It is shown that although the computational effort using the eT method is much less than the IDA analysis, the results of both methods are consistent. Finally collapse fragility curves using eT and IDA methods are produced and it is shown that the probabilities of collapse in different hazard levels are also consistent.

关键词： endurance time method collapse analysis incrementa

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基于纳秒LIBS的氢气/空气火焰混合分数测量研究

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光谱学与光谱分析 2025年第1期45卷 24-29页

作者：刘子晗刘艳韩磊单沅鲁政高强李帅瑶李博天津大学内燃机燃烧学国家重点实验室天津300072 中国科学院工程热物理研究所北京100190

在双碳政策和化石能源短缺的背景下,氢能作为高效环保的清洁能源,受到广大研究人员的关注。氢气/空气混合燃烧作为推动氢能规模化应用的重要途径,其燃烧机理和关键参数的测量技术成为目前研究的热点。燃空当量比是表征燃烧过程中燃料与... 详细信息

在双碳政策和化石能源短缺的背景下,氢能作为高效环保的清洁能源,受到广大研究人员的关注。氢气/空气混合燃烧作为推动氢能规模化应用的重要途径,其燃烧机理和关键参数的测量技术成为目前研究的热点。燃空当量比是表征燃烧过程中燃料与氧化剂混合程度的重要参数,直接影响燃烧的开始、自持以及燃烧化学反应的活跃程度。因此,对燃烧过程中的局部当量比实时在线监测,对于改善燃烧效率、控制燃烧过程具有重要意义。目前,可以实时测量氢气/空气火焰当量比的方法相对较少,激光光谱技术作为一种非侵入式的测量方法,不仅具有实时在线测量的能力,还具有快速、原位、远程分析、多元素同时在线监测等特点,在燃烧测量领域具有重要的应用潜力。采用纳秒激光诱导击穿光谱技术对氢气和空气燃烧场的燃空当量比进行测量研究。氢气和空气在管内混合后,由射流口喷出形成射流燃烧火焰场。激光通过透镜聚焦到射流燃烧场中击穿并产生等离子体,其等离子体的发射光谱由光谱仪采集,实验发现光谱中h 656 nm和O 777 nm具有很强的发射强度,且光谱强度随着当量比的变化,呈现规律性变化趋势。因此,采用h 656 nm和O 777 nm的光谱分别标示氢气和空气,并将其比值作为燃空当量比的测量参量。实验在氢气空气混合均匀的低速流场中测量了不同当量比下h 656 nm与O 777 nm的光谱强度比值,并与当量比建立标定曲线,实验发现该标定曲线对燃烧场和非燃烧场同样适用。基于标定曲线,我们研究了存在外界掺混情况下,射流燃烧场的局部燃空当量比情况。在当量比1.0,流场速度为20 m·s^(-1)的射流燃烧场中,测量了射流中心位置不同高度的燃空当量比变化情况,并在相同工况下进行了数值模拟。模拟结果与实验测量吻合较好,验证了纳秒激光诱导击穿光谱技术测量氢气/空气混合气的燃空当量比的可行性。该方法可为氢气燃烧基础研究及数值模拟提供技术支持。

关键词：激光诱导击穿光谱氢能当量比模拟

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One-dimensional Ga N nanomaterials transformed from one-dimensional Ga_2O_3 and Ga nanomaterials

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Nano-Micro Letters 2009年第1期1卷 4-8页

作者： X.Y.han Y.h.Gao X.h.Zhang Wuhan National Laboratory for Optoelectronics-Shool of Physics Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics & Col ege of Optoelectronic Science and engineering Huazhong University of Science and Technology

One-dimensional(1D) GaN nanomaterials exhibiting various morphologies and atomic structures were prepared via ammoniation of either Ga_2O_3 nanoribbons, Ga_2O_3 nanorods or Ga nanowires filled into carbon nanotubes(CNTs). The 1D GaN nanomaterials transformed from Ga_2O_3 nanoribbons consisted of numerous GaN nanoplatelets having the close-packed plane, i.e.(0002)2h or(111)3C parallel to the axes of starting nanoribbons. The 1D GaN nanomaterials converted from Ga_2O_3 nanorods were polycrystalline rods covered with GaN nanoparticles along the axes. The 1D GaN nanomaterials prepared from Ga nanowires filled into CNTs displayed two dominant morphologies:(i) single crystalline Ga N nanocolumns coated by CNTs, and(ii) pure single crystalline Ga N nanowires. The cross-sectional shape of Ga N nanowires were analyzed through the transmission electron microscopy(TeM) images. Formation mechanism of all-mentioned 1D GaN nanomaterials is then thoroughly discussed.

关键词： GaN One-dimensional Ga2O3 Nanostructures

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Schrodinger equation for an Open System

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Chinese Physics Letters 2002年第9期19卷 1238-1243页

作者：毕桥 h.e.Ruda ComplexityScienceCenter YangzhouUniversityYangzhou225002 energeniusCentreforAdvancednanotechnology UniversityofTorontoTorontoM5S3E4Canada

We present a Schr?dinger (Liouville) type of equation for a quantum open system. It has a correlated part, and various master equations may be its special cases. It also has significant applications for constructing decoherence-free subspace for quantum computation. It is related to the original Schrodinger (Liouville) equation for the total system through a non-unitary similarity transformation. It is unnecessary for its correlated part to be self-adjoint, so there is a complex spectrum for the corresponding hamiltonian (Liouvillian), which enables the time evolution of states to be asymmetric. This shows just the correlation to produce evolution of world.

关键词： Liouville equation

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First-principles study of the structural,elastic,electronic,optical,and vibrational properties of intermetallic Pd_2Ga

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Chinese Physics B 2012年第3期21卷 341-348页

作者： Yildirim A Koc h Deligoz e Department of Physics Siirt University Department of Physics Aksaray University

The structural, elastic, electronic, optical, and vibrational properties of the orthorhombic Pd2Ga compound are investigated using the norm-conserving pseudopotentials within the local density approximation in the frame of density functional theory. The calculated lattice parameters have been compared with the experimental values and found to be in good agreement with these results. The second-order elastic constants and the other relevant quantities, such as the Young＇s modulus, shear modulus, Poisson＇s ratio, anisotropy factor, sound velocity, and Debye temperature, have been calculated. It is shown that this compound is mechanically stable after analysing the calculated elastic constants. Furthermore, the real and imaginary parts of the dielectric function and the optical constants, such as the optical dielectric constant and the effective number of electrons per unit cell, are calculated and presented. The phonon dispersion curves are derived using the direct method. The present results demonstrate that this compound is dynamically stable.

关键词： Pd2Ga vibrational properties optical properties elastic constants

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ALOXe3基因突变致常染色体隐性先天性鱼鳞病一例

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中国麻风皮肤病杂志 2025年第1期41卷 9-14页

作者：韩春雨韩建文内蒙古医科大学附属医院内蒙古呼和浩特010000

目的:明确一例常染色体隐性鱼鳞病基因突变及0.5%神经酰胺乳膏治疗效果。方法:收集先证者的临床资料,提取先证者及其亲属外周血DNA,采用序列捕获技术对相关基因进行高通量测序,并对其变异位点进行一代验证。明确诊断后给予先证者外用0.5... 详细信息

目的:明确一例常染色体隐性鱼鳞病基因突变及0.5%神经酰胺乳膏治疗效果。方法:收集先证者的临床资料,提取先证者及其亲属外周血DNA,采用序列捕获技术对相关基因进行高通量测序,并对其变异位点进行一代验证。明确诊断后给予先证者外用0.5%神经酰胺乳膏治疗,并随访10个月。结果:先证者皮损组织病理符合鱼鳞病病理改变,全基因组外显子测序及Sanger测序验证发现先证者ALOXe3基因存在复合杂合突变(错义变异c.1208A>G:p.h403R和一个移码变异c.102dup:p.K35Qfs^(*)29)。先证者的母亲(错义变异c.1208A>G:p.h403R)和父亲(移码变异c.102dup:p.K35Qfs^(*)29)分别是单个突变的携带者。给予外用0.5%神经酰胺乳膏治疗10个月,全身皮肤干燥及褐色鳞屑得到明显改善。结论:ALOXe3基因的复合杂合突变可能是该常染色体隐性鱼鳞病患者的病因。0.5%神经酰胺乳膏治疗可取得良好效果。

关键词：常染色体隐性先天性鱼鳞病 ALOXe3基因复合杂合突变神经酰胺乳膏

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The PhYSICAL SIMULATION ON eXTRUSION PROCeSS OF GLASS FIBeR COMPOSITe WIRe COATeD BY LeAD

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Acta Metallurgica Sinica(english Letters) 2004年第6期17卷 940-944页

作者： h.F.Sun W.B.Fang F.han W.X.he e.D.Wang SchoolofMaterialsScienceandengineering HarbinInstituteofTechnologyHarbin150001China

The method of manufacturing the composite wire by extruding lead to coated glass fiber is described. The different composite wire that diameter is from 0.5 to 1.0mm has been produced by two kinds of different extruding technology (getting wire along horizontal direction and getting wire along perpendicular direction). The optimal extruding techno- logical parameter has been given in different extruding technology by the physical simulation (h: 300℃, 550kN, 0.16mm. P: 300℃, 215kN, 0.16mm). The effect on the coating speed by other extruding technological parameters in the different extruding technology has been discussed. The extruding temperature and extruding force is higher, the coating speed is faster. It has been pointed, that the affection on the extruding technology by the extruding temperature has also behaved as the extruding temperature rising up spontaneously. The reason for exiting the minimum extruding force and maximum extruding force also has been discussion in this paper. It is also important to the extruding process and coating speed that is the coating clearance.

关键词： composite lead glass fiber coating physical simulation

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Sub-channel shared resource allocation for multi-user distributed MIMO-OFDM systems

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Journal of Zhejiang University-Science C(Computers and electronics) 2014年第11期15卷 1048-1057页

作者： Na-e ZheNG You ZhOU han-ying hU Sheng WANG Zhengzhou Information Science and Technology Institute National Digital Switching System engineering & Technological Research Center

Well-controlled resource allocation is crucial for promoting the performance of multiple input multiple output orthogonal frequency division multiplexing(MIMO-OFDM) systems. Recent studies have focused primarily on traditional centralized systems or distributed antenna systems(DASs), and usually assumed that one sub-carrier or sub-channel is exclusively occupied by one user. To promote system performance, we propose a sub-channel shared resource allocation algorithm for multiuser distributed MIMO-OFDM systems. each sub-channel can be shared by multiple users in the algorithm, which is different from previous algorithms. The algorithm assumes that each user communicates with only two best ports in the system. On each sub-carrier, it allocates a sub-channel in descending order, which means one sub-channel that can minimize signal to leakage plus noise ratio(SLNR) loss is deleted until the number of remaining sub-channels is equal to that of receiving antennas. If there are still sub-channels after all users are processed, these sub-channels will be allocated to users who can maximize the SLNR gain. Simulations show that compared to other algorithms, our proposed algorithm has better capacity performance and enables the system to provide service to more users under the same capacity constraints.

关键词： MIMO-OFDM Multi-user Resource allocation Sub-channel shared Signal to leakage plus noise ratio(SLNR)

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