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Enhanced entropy generation and heat transfer characteristics of magnetic nano-encapsulated phase change materials in latent heat thermal energy storage systems

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1051-1070页

作者： p.s.REDDY p.sREEDEVI Department of Mathematics Rajeev Gandhi Memorial College of Engineering and TechnologyNandyal 518501India

The objective of the current study is to investigate the importance of entropy generation and thermal radiation on the patterns of velocity,isentropic lines,and temperature contours within a thermal energy storage device filled with magnetic nanoencapsulated phase change materials(NEpCMs).The versatile finite element method(FEM)is implemented to numerically solve the governing *** effects of various parameters,including the viscosity parameter,ranging from 1 to 3,the thermal conductivity parameter,ranging from 1 to 3,the Rayleigh parameter,ranging from 102 to 3×10^(2),the radiation number,ranging from 0.1 to 0.5,the fusion temperature,ranging from 1.0 to 1.2,the volume fraction of NEpCMs,ranging from 2%to 6%,the stefan number,ranging from 1 to 5,the magnetic number,ranging from 0.1 to 0.5,and the irreversibility parameter,ranging from 0.1 to 0.5,are examined in detail on the temperature contours,isentropic lines,heat capacity ratio,and velocity ***,the heat transfer rates at both the cold and hot walls are analyzed,and the findings are presented *** results indicate that the time taken by the NEpCMs to transition from solid to liquid is prolonged inside the chamber region as the fusion temperatureθf ***,the contours of the heat capacity ratio Cr decrease with the increase in the stefan number ste.

关键词： volume fraction of nano-encapsulated phase change material(NEpCM) radiation stefan number heat capacity ratio entropy generation

Kinetics and microstructural modeling of isothermal austenite-to-ferrite transformation in Fe-C-Mn-si steels

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Journal of Materials science & Technology 2019年第8期35卷 1753-1766页

作者： s.J.song W.K.che J.B.Zhang L.K.Huang s.Y.Duan F.Liu state Key Laboratory of solidification processing Northwestern Polytechnical University

During the multi-stage processing of advanced high-strength steels, the austenite-to-ferrite transformation, generally as a precursor of the formation of other non-equilibrium or metastable structures, has a severe effect on the subsequent phase transformations. Herein, a more flexible kinetic and microstructural predictive modeling for the key austenite-to-ferrite transformation of Fe-C-Mn-si steels was developed,in combination with the classical nucleation theory, the general mixed-mode growth model based on Gibbs energy balance, the microstructural path method and the kinetic framework for grain boundary nucleation. Adopting a bounded, extended matrix space corresponding to a single ferrite grain, both softimpingement and hard-impingement can be naturally included in the current modeling. Accordingly, this model outputs the ferrite volume fraction, the austenite/ferrite interface area per unit volume, and the average grain size of ferrite, which will serve as the input parameters for modeling the subsequent bainite or martensite transformations. Applying the model, this work successfully predicts the experiment measurement of the isothermal austenite-to-ferrite transformation in Fe-0.17 C-0.91 Mn-1.03 si(wt%) steel at different temperatures and explains why the final-state average grain size of ferrite has a maximum at the moderate annealing temperature. Effectiveness and advantages of the present model are discussed arising from kinetics and thermodynamics accompanied with nucleation, growth and impingement.

关键词： Isothermal austenite-ferrite transformation Kinetics Thermodynamics Microstructural modeling Low-alloy steel

Restructuring of plasmonic nanoparticle aggregates with arbitrary particle size distribution in pulsed laser fields

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Chinese physics B 2016年第11期25卷 563-570页

作者： A E Ershov A p Gavrilyuk s V Karpov s p polyutov Institute of Computational Modeling Russian Academy of SciencesKrasnoyarsk 660036Russia L.V.Kirensky Institute of physics of the Russian Academy of sciences Krasnoyarsk 660036Russia siberian Federal University Krasnoyarsk 660028Russia siberian state Aerospace University Krasnoyarsk 660037Russia

We have studied processes of interaction of pulsed laser radiation with resonant groups of plasmonic nanoparticles（resonant domains） in large colloidal nanoparticle aggregates having different interparticle gaps and particle size *** processes are responsible for the origin of nonlinear optical effects and photochromic reactions in multiparticle *** describe photo-induced transformations in resonant domains and alterations in their absorption spectra remaining after the pulse action,we introduce the factor of spectral *** on calculation of changes in thermodynamic,mechanical,and optical characteristics of the domains,the histograms of the spectrum photomodification factor have been obtained for various interparticle gaps,an average particle size,and the degree of *** in spectra have been analyzed depending on the intensity of laser radiation and various combinations of size characteristics of *** obtained results can be used to predict manifestation of photochromic effects in composite materials containing different plasmonic nanoparticle aggregates in pulsed laser fields.

关键词： resonant arbitrary pulsed dipole manifestation alterations extinction remaining aggregate colloidal

Improved sample added LMMsE receiver based on interference mitigation for HsDpA downlink

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The Journal of China Universities of posts and Telecommunications 2008年第2期15卷 39-44页

作者： che Wen ZHAO Hui WANG Wen-bo Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications Beijing 100876 China

In the downlink of wideband code division multiple access （WCDMA） or WCDMA- high speed downlink packet access （HsDpA） system, the frequency reuse factor is equal to 1, which leads to more possible co-channel interference from neighbor cells. In this situation, user equipment（UE） with traditional receiver will suffer from significant performance degradation at the edge of the cell. To solve this problem, a receiver structure considering interference mitigation has been proposed for long term evolution（LTE） of third-generation partnership project （3Gpp）. such receiver makes use of all the interfering cells＇ channel information to perform a linear minimum mean square error （LMMsE） equalization algorithm. In this article, an improved equalization algorithm is presented, which simply adds more samples to perform one equalization operation. simulations show that the proposed algorithm can obtain a considerable performance improvement in frequency selective fading channel, with relative little additional complexity introduced.

关键词： LMMsE HsDpA equalizer

Crystal structure of a Nickel(II) Complex with Asymmetric _L-Histidine Ligand

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Chinese Journal of structural chemistry 2006年第9期25卷 1047-1050页

作者： JIN Yi che Yun-Xia ZHENG Ji-Min Department of chemistry Nankai University Tianjin 300071 China

A novel nickel（Ⅱ） complex with L-histidine has been synthesized and solved by single-crystal X-ray diffraction analysis at physiological pH. The title complex （C7H16NiN4O6s, Mr = 343.01） crystallizes in monoclinic, space group p21 with a = 7.2194（7）, b = 7.5968（7）, c = 12.2797（11） A, β = 93.3110（10）°, V = 672.35（11） A^3, Z = 2, Dc= 1.694 g/cm^3, F（000） = 356, μ（MoKα） = 1.626 mm^-1, T = 293（2） K, the final R = 0.0184 and wR = 0.0426 for 2207 observed reflections with 1 〉 2σ（I）. The complex provides insights into a possible structural arrangement between nickel （Ⅱ） and L-histidine which may be physiologically important and abundantly present in biological systems.

关键词： crystal structure synthesis L-histidine nickel physiological pH

Multiobjective optimization of friction welding of UNs s32205 duplex stainless steel

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Defence Technology（防务技术） 2015年第2期11卷 157-165页

作者： p.M.AJITH Birendra Kumar BARIK p.sATHIYA s.ARAVINDAN Department of production Engineering National Institute of Technology Department of Mechanical Engineering Indian Institute of Technology Delhi

The present study is to optimize the process parameters for friction welding of duplex stainless steel(Dss UNs s32205).Experiments were conducted according to central composite *** variables,as inputs of the neural network,included friction pressure,upsetting pressure,speed and burn-off *** strength and microhardness were selected as the outputs of the neural *** weld metals had higher hardness and tensile strength than the base material due to grain refinement which caused failures away from the joint interface during tensile *** to shorter heating time,no secondary phase intermetallic precipitation was observed in the weld joint.A multi-layer perceptron neural network was established for modeling *** various training algorithms,belonging to three classes,namely gradient descent,genetic algorithm and LevenbergeM arquardt,were used to train artificial neural *** optimization was carried out by using particle swarm optimization *** test was carried out by setting the optimized *** conformation test,maximum tensile strength and maximum hardness obtained are 822 Mpa and 322 Hv,*** metallurgical investigations revealed that base metal,partially deformed zone and weld zone maintain austenite/ferrite proportion of 50:50.

关键词：多目标优化不锈钢焊接摩擦压力双相人工神经网络 UNs 拉伸强度优化工艺参数

semi-solid moulding:Competition to cast and machine from forging in making automotive complex components

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中国有色金属学会会刊：英文版 2010年第S3期20卷 1042-1047页

作者： s.p.MIDsON Aluminium Complex Components Inc 2211 South Jason StreetDenverColorado 80223USA

The very latest technique for impeller manufacture is called semi-solid moulding(ssM).Cummins Turbo Technologies Limited,together with Aluminum Complex Components Inc,developed ssM compressor wheels as a way of achieving cost and durability performance somewhere between that of cast and machined from solid(MFs) aluminium alloy *** results show ssM material has a superior microstructure and mechanical properties over cast and comparable to MFs *** testing including durability testing,using accelerated speed cycle tests,proves ssM compressor wheels emerge as being significantly more durable than cast equivalents and approaching that of MFs *** challenges for semi-solid processing in manufacture of other complex components and other materials in automotive industry in terms of both cost and durability are also discussed.

关键词： aluminum alloys semi-solid moulding durability automotive complex component turbocharger compressor wheel

An effective round ball tool in electrochemistry process as novel reuse fabrication technology

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中国有色金属学会会刊：英文版 2012年第S3期22卷 825-830页

作者： p.s.pA Department of Digital Content Design Graduate School of Toy and Game DesignNational Taipei University of Education

A reuse fabrication module using micro electrochemistry (MECM) with a round-ball tool to remove the defective In2O3 snO2 thin film from the surfaces of digital paper display was *** etching effect improves that the number of the round-balls decreases for promoting the concentration of electric power and increasing discharge *** a small size of the round-ball tool takes less time for the same amount of In2O3 snO 2 layer removal since the effect of MECM is easily developed for supplying of sufficient electrochemical power.A higher feed rate of the poly ethylene terephthalate (pET) diaphragm combines with enough electric power to drive fast etching rate.A pulsed direct current can improve the effect of dreg discharge and is advantageous to couple this current with the fast feed rate of the *** the ultra-precise etching of In2O 3 snO2,the optoelectronic semiconductor industry can effectively reuse the defective products,reducing production *** precision etching process is of high efficiency and requires only a short period of time to remove the In2O3 snO2 nanostructures.

关键词： thin film round-ball tool In2O3snO2 micro electrochemistry digital paper display

Vagus nerve stimulation in intracerebral hemorrhage:the need for further research

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Neural Regeneration Research 2025年第11期20卷 3213-3214页

作者： sheharyar s.Baig Ali N.Ali Arshad Majid sheffield Institute for Translational Neuroscience Division of NeuroscienceThe University of SheffieldSheffieldUK

Vagus nerve stimulation(VNs)and stroke:stroke is the second leading cause of death and the third leading cause of disability worldwide(Baig et al.,2023).There have been significant paradigm shifts in the management of acute ischemic stroke through mechanical *** chronic ischemic stroke,invasive VNs paired with rehabilitation is associated with a significant increase in upper limb motor recovery and is FDA-approved(Baig et al.,2023).There are no treatments of similar efficacy in acute intracerebral hemorrhage(ICH)where several promising trials,e.g.,TICH-2,sTOp-AUsT,and TRAIGE did not show improvements in functional outcomes(puy et al.,2023).

关键词： stimulation acute