ANSYS仿真在初晶点探头设计中的应用

本文利用ANSYS仿真的方法，对铝电解质初晶点测量探头进行优化设计。以缩短设计周期，并降低成本。     

Effect of baking processes on properties of TiB2/C composite cathode material

Pitch and TiB₂/C green composite cathode material were respectively analyzed with simultaneous DSC-TGA, and effects of three baking processes of TiB₂/C composite cathode material, i.e. K25, K5 and M5, on properties of TiB₂/C composite cathode material were investigated. The results show that thermogravimetric behavior of pitch and TiB₂/C green composite cathode is similar, and appears the largest mass loss rate in the temperature range from 200 to 600°C. The bulk density variation of sample K5 before and after baking is the largest (11.9%), that of sample K25 is the second, and that of sample M5 is the smallest (6.7%). The crushing strength of sample M5 is the biggest (51.2 MPa), that of sample K25 is the next, and that of sample K5 is the smallest (32.8 MPa). But, the orders of the electrical resistivity and electrolysis expansion of samples are just opposite with the order of crushing strength. The heating rate has a great impact on the microstructure of sample. The faster the heating rate is, the bigger the pore size and porosity of sample are. Compared with the heating rate between 200 and 600° of samples K25 and K5, that of sample M5 is slower and suitable for baking process of TiB₂/C composite cathode material. Foundation item: Project (2005CB623703) supported by the Major State Basic Research and Development Program of China; Project (2008AA030502) supported by the National High-Tech Research and Development Program of China     

不锈钢表面粉末渗铝及其抗高温氧化性能研究

研究了316L不锈钢表面的固体粉末渗铝以及渗铝处理前后不锈钢的抗高温氧化性.结果表明,研究所用粉末渗铝法可在不锈钢表面形成厚度约100 μm的渗层,渗层主要由NiAl相和Ni3Al相组成,渗层与基体之间结合紧密;对渗铝不锈钢进行热氧化处理,可在其表面形成致密均匀、且主体成分为氧化铝的表面膜;与没有处理的不锈钢相比,渗铝处理后不锈钢的抗高温氧化性能明确增强,这主要是由于渗铝层在高温下所形成的致密氧化膜层阻止了氧化性气体对基体金属的进一步氧化.     

基于跨层设计的多判据AODV路由优化机制

针对无线Mesh网络中传统AODV协议路由判据单一从而导致路由性能较差的缺陷,提出一种多判据AODV跨层路由优化机制ACRO(AODV Cross-layer Routing Optimization).该机制基于跨层设计思想,采用最小跳数与来自物理层和MAC层的多种路由判据相互协作,考虑了传播环境和接入性能,在路由算法中定义了混合多维路由判据, 并提出多判据AODV跨层路由优化机制.理论分析和NS2仿真结果证明,这种路由优化机制提高了吞吐量,降低了网络时延和载荷,路由性能得到明显改善.     

Structure characterization and electrochemical properties of new lithium salt LiODFB for electrolyte of lithium ion batteries

Lithium difluoro（axalato）borate （LiODFB） was synthesized in dimethyl carbonate （DMC） solvent and purified by the method of solventing-out crystallization. The structure characterization of the purified LiODFB was performed by Fourier transform infrared （FTIR） spectrometry and nuclear magnetic resonance （NMR） spectrometry. The electrochemical properties of the cells using 1 mol/L LiPF6 and 1 mol/L LiODFB in ethylene carbonate （EC）/DMC were investigated, respectively. The results indicate that LiODFB can be reduced at about 1.5 V and form a robust protective solid electrolyte interface （SEI） film on the graphite surface in the first cycle. The graphite/LiNi1/3Mn1/3Co1/3O2 cells with LiODFB-based electrolyte have very good capacity retention at 55 ℃, and show very good rate capability at 0.5C and 1C charge/discharge rate. Therefore, as a new salt, LiODFB is a most promising alternative lithium salt to replace LiPF6 for lithium ion battery electrolytes in the future.     

Synthesis and electrochemical performance of TiO2-B as anode material

TiO₂-B was synthesized by solid-state reaction. The structures, surface morphologies and electrochemical performances of TiO₂-B were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical measurement, respectively. The effects of calcining temperature, molar ratio of K₂O to TiO₂ and calcining time on the characteristics of TiO₂-B were investigated. The results show that the calcining time exerts a significant influence on the electrochemical performances of TiO₂-B. The TiO₂-B is obtained with good crystal structure and suitable size by using K₂Ti₄O₉, which is prepared at 950°C for 24 h under the condition of x(K₂O)/x(TiO₂)=1:3.5. The TiO₂-B delivers all initial discharge capacity of 231.6 mA·h/g. And the rate capacity is 73.2 mA·h/g at 1 675 mA/g, which suggests that TiO₂-B is a promising anode material for the lithium ion batteries.     

基于数据仓库的铝电解网络监控系统的设计与实现

在铝电解生产过程中，局域网和工业控制网集成，即监控系统的网络化，已成为当前及今后企业信息化发展的主要目标之一。本文提出了铝电解网络监控系统的设计与实现技术，该系统基于ORACLE等大型关系型数据库和数据仓库技术，实现了局域网与CAN网的集成。文中详细论述了系统实现了几个关键问题，如数据的采集与提取、组织与存储，信息的显示，网络中信息的传输等。在文章最后，对与管理系统相融合做了初步探索。     

Heat balance simulation of drained aluminum reduction cell

1　INTRODUCTIONThecarbon linedbottomoftheexistingHall Heroult(H H)cellworksasthecathodeandalsoasacontainer ,inwhichthemoltenaluminumpadisaccu mulatedtoaheightofabout 18to 2 0cm .Themetalpadisbeneficialtothewettabilityofthecarboncath odeandthereductionofcontactresistancebetweenthecarboncathodeandaluminumliquid .However ,becausethemoltenaluminumpadwhichalsoservesasthecellcathodecanbecomeirregularandvariableinthicknessduetoelectromagneticeffectsandbathcir culation ,itisrequiredthattheanodec…     

企业质量元数据标准研究与制定

如何使质量管理人员在现代质量管理环境下有效应用和管理质量数据是提高企业质量管理水平面临的首要问题.提出质量元数据的概念,通过它可使质管人员对质量数据的各种属性有更加深入的了解,为进一步使用和管理质量数据打下坚实的基础.同时,重点阐述质量元数据标准的制定过程,给出元数据标准的内容结构和置标方案.     

锂离子动力电池检测系统研究

随着近些年来锂离子动力电池的广泛应用,作为生产锂离子电池关键设备的检测系统也成为新的研究热点.文中对锂离子动力电池检测设备的发展状况进行了总结,从系统结构、硬件和软件设计方面概括了新技术、新工艺在电池检测设备上的应用状况,介绍了均衡电路、模糊PID控制、智能专家系统等技术在检测系统充放电控制上的研究.最后讨论和总结了锂离子动力电池检测设备今后的发展方向.