检索结果-南通市图书馆

Pressure-Driven Contact Mechanics Evolution of Cathode Interfaces in Lithium Batteries

Acta Mechanica Solida Sinica 2023年第1期36卷 65-75页

作者： min chen Lingyun Xiao Honglei Dong Jie Fan Xin Zhang Defective Product Administrative Center State Administration for Market RegulationBeijing 100101China China Merchants Testing Vehicle Technology Research Institute Co. Ltd.Chongqing 400000China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

The interfacial instability due to periodic volume expansion of electrodes in the charging and discharging process directly affects the contact performance and interface impedance between the electrodes and the solid-state electrolyte(SSE).The existing work has studied the local stress state behavior on a single spatial scale or only focused on the interfacial influence of electrochemical characteristics at a specific *** this paper,a semi-analytical method-based chemoelastic contact model was developed to study the evolution behavior of the cathode/SSE interface,and the stress and displacement fields subjected to contact forces were calculated by means of the discrete convolution-fast Fourier transform *** interface evolution subjected to mechanical pressure was analyzed for the local influence of the stress at one position at a specified time on the contact behavior at the present time and position,and the global influence of those at other positions at a later *** on this model,the mechanical-chemical coupling effect of lithium intercalation on interface stability was quantitatively studied,and the mechanism of enhancing interfacial contact stability by mechanical load was further *** results show that a larger current causes the contact toward the center,while a larger mechanical force leads to a smaller pressure *** the increase in mechanical force,the compressive stress in the contact area decreases significantly,while the tensile stress outside the contact area increases *** on the model results,a transition map was constructed with bonder equation(P/I=25MPa·cm^(2)/mA)to define whether an interfacial contact is stable or ***,applying a mechanical pressure P/I>25MPa·cm^(2)/mA can maintain a stable interfacial contact between the SSE and the *** proposed model provides a theoretical basis in the chemomechanics view for the understanding of using pressure to suppress diffusion-induced contact

关键词： Solid-state battery Contact mechanics Chemoelastic coupling Cathode interface Mechanical force

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Viscosity prediction on iron-bearing slags during pyrometallurgical recycling: structure-based modeling of CaO-‘FeO’-MgO-Al_(2)O_(3)-SiO_(2) system and its subsystems

引用

Journal of Iron and Steel Research International 2021年第6期28卷 679-692页

作者： Guang-zong Zhang Nan Wang min chen Yan-qing cheng School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon Steelmaking Shenyang 110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon Steelmaking Shenyang 110819LiaoningChina

A structure-based modeling of the CaO-‘FeO’-MgO-Al_(2)O_(3)-SiO_(2) system and its subsystems was investigated based on iron extraction nickel slagaluminum *** optimization in the present model indicated that the coefficient of free O^(2-)in FeO,a_(O_(FeO)^(2-)),on the lengths of network linkage had the largest value and O_(FeO)^(2-)(free O^(2)-in FeO)had the largest *** coefficients of bridging oxygen(a_(Si-O-Al) and a_(Al-O-Al))were lower than those of nonbridging oxygen and free oxygen(O^(2-)).Viscosity prediction for the CaO-‘FeO’-(8 wt.%)MgO-Al_(2)O_(3)-SiO_(2) system was conducted at a fixed slag basicity,which indicated that the predicted viscosity changed monotonously with the FeO ***,the non-monotonous evolution with Al2O3 content reflected the amphoteric behavior of *** addition,the performances of the present model in predicting viscosity binary(‘FeO’-SiO_(2))to quinary(CaO-‘FeO’-MgO-Al_(2)O_(3)-SiO_(2))system were analyzed and a comparison with the established models was made.

关键词： Nickel slag Viscosity model Slag structure Iron-bearing slag CaO-FeO-MgO-Al_(2)O_(3)-SiO_(2)system

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Dynamics Simulation on Interface Characteristics of Micro Droplets

引用

Chinese Physics Letters 1999年第11期16卷 803-804页

作者： YANG Chun chen min GUO Zeng-yuan Department of Engineering Mechanics Tsinghua UniversityBeijing 100084

Liquid droplets of argon surrounded by the vapor for various temperatures have been simulated by the molecular dynamics method. Macroscopic characteristics of droplets such as density, pressure and temperature profiles are evaluated with emphasis on the temperature characteristics, which was usually regarded uniform in the surface region for an equilibrium liquid-vapor system. The 12-6 Lennard-Jones potential and periodic boundary conditions are employed in the 1000-particles three-dimensional simulation. What differs from the literatures is that the temperature in the surface region is not uniform, but exhibits a curve with two extrema. The peak and valley values are higher and lower than the bulk saturation temperature respectively. The magnitude of the peak and valley values becomes smaller when the saturation temperature is closer to the critical temperature.

关键词： temperature. saturation closer

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Monte Carlo Simulation of Argon in Nano-Space

引用

Chinese Physics Letters 2000年第5期17卷 313-315页

作者： chen min YANG Chun GUO Zeng-Yuan Department of Engineering Mechanics Tsinghua UniversityBeijing 100084

Monte Carlo simulations are performed to investigate the thermodynamic properties of argon conBned in nano-scale cubes constructed of graphite walls.A remarkable depression of the system pressures is *** simulations reveal that the length-scale of the cube,the magnitude of the interaction between the fluid and the graphite wall and the density of the fluid exhibit reasonable effects on the thermodynamic property shifts of the Buid.

关键词： walls property Simulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A versatile volume-based modeling technique of distributed local quadratic convergence for aeroengines

引用

Propulsion and Power Research 2024年第1期13卷 46-63页

作者： Yudong Liu min chen Hailong Tang School of Energy and Power Engineering Beihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China

For advanced aero-engine design and research,modeling and simulation in a digital environment is indispensable,especially for engines of complicated configurations,such as var-iable cycle engines(VCE)and adaptive cycle engines(ACE).Also,in the research of future smart engines,reliable real-time digital twins are ***,the 2 dominant methods that used in solving the simulation models,Newton-Raphson(N-R)method and volume-based method,are not fully qualified for the study requirements,because neither of them reaches the satisfactory balance of convergence rate and calculating *** this study,by deeply analyzing the mathematical principle of these 2 methods,a novel modeling and solving method for aero-engine simulation,which integrates the advantages of both N-R and volume-based methods,is *** has distributed architecture and local quadratic convergence *** a novel modeling method for variable area bypass injectors(VABI)is put *** facilitate simulation of various configurations of *** modeling cases,including a high bypass-ratio(BPR)turbofan and an ACE,illustrate that the novel technique decreases the iterations by about two-thirds comparing with volume-based method,while the success rate of convergence remains over 99%.This proves its superiority in both convergence and calculating efficiency over the conventional *** technique can be used in advanced gas turbine en-gine design and control strategy optimization,and study of digital twins.

关键词： Aero-engine performance simulation Variable cycle engine Variable area bypass injector Digital twin Newton-Raphson method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acyclic 6-choosability of planar graphs without adjacent short cycles

引用

Science China Mathematics 2014年第1期57卷 197-209页

作者： WANG WeiFan ZHANG Ge chen min Department of Mathematics Zhejiang Normal University

A proper vertex coloring of a graph G is acyclic if G contains no bicolored *** a list assignment L={L(v)|v∈V}of G,we say that G is acyclically L-colorable if there exists a proper acyclic coloringπof G such thatπ(v)∈L(v)for all v∈*** G is acyclically L-colorable for any list assignment L with|L(v)|k for all v∈V(G),then G is acyclically *** this paper,we prove that every planar graph G is acyclically 6-choosable if G does not contain 4-cycles adjacent to i-cycles for each i∈{3,4,5,6}.This improves the result by Wang and chen(2009).

关键词： acyclic coloring acyclic choosability planar graph 05C15

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Job schedulers for Big data processing in Hadoop environment： testing real-life schedulers using benchmark programs

引用

Digital Communications and Networks 2017年第4期3卷 260-273页

作者： Mohd Usama Mengchen Liu min chen Embedded and Pervasive Computing(EPIC) Lab School of Computer Science and Technology Huazhong University of Science and Technology wuhon 430074 China

At present, big data is very popular, because it has proved to be much successful in many fields such as social media, E-commerce transactions, etc. Big data describes the tools and technologies needed to capture, manage, store, distribute, and analyze petabyte or larger-sized datasets having different structures with high speed. Big data can be structured, unstructured, or semi structured. Hadoop is an open source framework that is used to process large amounts of data in an inexpensive and efficient way, and job scheduling is a key factor for achieving high performance in big data processing. This paper gives an overview of big data and highlights the problems and challenges in big data. It then highlights Hadoop Distributed File System （HDFS）, Hadoop MapReduce, and various parameters that affect the performance of job scheduling algorithms in big data such as Job Tracker, Task Tracker, Name Node, Data Node, etc. The primary purpose of this paper is to present a comparative study of job scheduling algorithms along with their experimental results in Hadoop environment. In addition, this paper describes the advantages, disadvantages, features, and drawbacks of various Hadoop job schedulers such as FIFO, Fair, capacity, Deadline Constraints, Delay, LATE, Resource Aware, etc, and provides a comparative study among these schedulers.

关键词： Big Data Hadoop MapReduce HDFS Scheduler Classification Locality Benchmark

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sources and transformations of nitrite in the Amundsen Sea in summer 2019 and 2020 as revealed by nitrogen and oxygen isotopes

引用

Acta Oceanologica Sinica 2023年第4期42卷 16-24页

作者： Yangjun chen Jinxu chen Yi Wang You Jiang minfang Zheng Yusheng Qiu min chen College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China School of Marine Science and Fisheries Jiangsu Ocean UniversityLianyungang 222005China

In this study,the nitrogen and oxygen isotope compositions of nitrite in the upper 150 m water column of the Amundsen Sea in the summer of 2019 and 2020 were measured to reveal the distribution and transformation of nitrite in the euphotic zone of the Southern *** found that primary nitrite maxima(PNMs)are widely present in the Amundsen Sea,where the depth of occurrence deepens from east to west and nitrite concentrations *** from dual isotopes suggests that the formation of PNMs in all regions of the Amundsen Sea is dominated by ammonia *** importantly,the nitrogen and oxygen isotope compositions of nitrite in the Amundsen Sea mixed layer are abnormal,and their depth profiles are mirror *** anomalies exhibit spatial variations,with central surface water having the lowest nitrogen isotope composition(−89.9‰±0.2‰)and western surface water having the highest oxygen isotope composition(63.3‰±0.3‰).Isotopic exchange reaction between nitrate and nitrite is responsible for these isotope anomalies,as both nitrogen and oxygen isotopes have large isotopic fractionation and opposite enrichment *** proves that isotopic exchange reaction operates extensively in different regions of the Amundsen *** study highlights the unique role of dual isotopes of nitrite in deepening the understanding of nitrogen *** studies on ammonia oxidation and isotopic exchange between nitrate and nitrite are warranted in the future to understand their roles in the nitrogen cycle in the Southern Ocean.

关键词： nitrogen isotope oxygen isotope nitrite Amundsen Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Oxygen Partial Pressure on Phase Equilibria and Liquidus in CaO-Al_2O_3-FeO_x System

引用

Journal of Iron and Steel Research International 2012年第11期19卷 8-12页

作者： WANG Nan HUANG Wei-jun chen Shuai-chao chen min School of Materials and Metallurgy Northeastern University Shenyang 110819 Liaoning China

A high temperature equilibration experiment was carried out to investigate the effect of oxygen partial pres- sure on the phase equilibria and liquidus in CaO-Al2O3- FeOx system with the intermediate oxygen partial pressures of 10.13 Pa and 1.01 × 10^-3 Pa. The equilibrated phases and their compositions of the quenched samples were analyzed by using SEM/EPMA （Scanning Electron Microscope/Electron Probe Micro Analysis） and XRD （X Ray Diffraction）. The phase equilibrium results include two cases, the two phase coexistence and the three-phase coexistence in the high Al2O3 region with oxygen partial pressure of either 10.13 Pa or 1.01 × 10^-3 Pa. Effects of oxygen partial pressure and temperature on the liquidus along the primary phase fields of CaO · Al2O3 and CaO · 2Al2O3 were nota hle. With the decrease of oxygen partial pressure, the liquid area expands and the liquidus of CaO · Al2O3 and CaO · 2Al2O3 primary fields moves to the Al2O3-FeOx region. On the other hand, the liquid area of CaO Al2O3-FeOx sys tem extends extremely to the high Al2O3 region with the temperature increasing from 1 400 to 1 500℃, especially at lower oxygen partial pressure. The present experiment results are in good agreement with the calculated ones by FactSage.

关键词： oxygen partial pressure liquidus phase equilibrium CaO-Al2O3 FeOx system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Structure and Electrical Properties of(Na_(0.5)Bi_(0.5))_(0.94)Ba_(0.06)TiO_3 Ceramic with 0.5 wt% of MnO

引用

Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 499-502页

作者： LIU Weihua XU Qing chen Wen chen min KIM Bokhee School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Faculty of Advanced Materials Engineering Chonbuk National University Chonju 561756 Korea

The structure and electrical properties of （Na0.5Bi0.5）0.94Ba0.06TiO3 ceramic doped with 0.5 wt% of MnO were investigated in comparison with those of （Na0.5Bi0.5）0.94Ba0.06TiO3 ceramic. It was ascertained that the MnO addition did not cause remarkable change in crystal structure and microstructure. The MnO addition mainly displayed a hard effect on the electrical properties, an increase of coercive field （E） and mechanical quality factor （Qm） together with a decrease of dielectric constant （εr） and piezoelectric constant （d33）. An enhancement of electromechanical coupling factor （kp） with the MnO addition was obtained too. An essential relation between the piezoelectric properties and ferroelectric nature of the ceramics was detected. It was found that the piezoelectric properties of the ceramics highly depended on the corporative contribution of remanent polarization （Pt） and coercive field.

关键词： ceramics oxides crystal structure piezoelectricity ferroelectricity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：