锂离子电池正极材料LiCoO_2中Li,Co的定量分析

探讨了锂离子电池的正极材料LiCoO2中Li,Co及Co2+的定量分析方法。用原子吸收分光光度法测定Li,Co比;Li,Co工作曲线回归方程分别为A=0.10845C-0.00057,A=0.02179C-0.00070,相关系数分别为0.99994和0.99993;Li,Co回收率为97%~104%。用络合滴定法测定了样品中Co总量;用氧化还原滴定法测定了Co3+含量。用络合滴定法测定高纯Co2O3中Co含量,得到相对误差为-0.37%,RSD=0.25%。样品中Co2+的含量用样品中Co的总量减去Co     

冷却壁材料对壁体温度的影响

以有限元为手段 ,采用ANSYS软件包构建 3D模型 ,充分考虑冷却壁传热的边界条件 ,对不同材质冷却壁温度场进行了分析 ,此分析可为冷却壁的长寿化设计和材料选用提供参考 ,具有一定的实用价值。     

Construction of Constitutive Relationships of the Deformation Theory for Simple in Noll's Sense Hardening Materials with Elastoplastic Behavior

Based on the theory of simple hardening materials with elastoplastic behavior, the general constitutive relationships of the deformation theory of plasticity are mathematically strictly constructed for arbitrary continuous, piece-wise continuously differentiable deformation trajectories, any strains and symmetry types of the material properties. Two conditions under which this is possible are considered. The approaches to a strict specialization of general constitutive relationships of the deformation theory of plasticity have been developed by imposing restrictions on the material strains, deformation processes and properties. In this case, the restrictions on the properties of materials formalize the data obtained in the experimental investigations. A series of both new and known constitutive relationships have been constructed that are arranged into a hierarchy according to the level of complexity of the response to deformation. The area of applicability of the derived physical equations has been defined. Special attention has been given to the modeling of finite and infinitesimal strains of isotropic materials. __________ Translated from Problemy Prochnosti, No. 6, pp. 35 – 49, November – December, 2005.     

磁性电磁吸波材料的研究现状与进展

磁性电磁波吸收材料是吸波材料最重要的分支，随着制备技术的发展和背景牵引，第二代磁性吸波材料正崭露头角。本文对两代磁性电磁波吸收材料的研究背景、吸波特点和研究现状进行了综述，并对吸波材料的发展进行展望。     

Crack Tip Shielding or Anti-shielding due to Smooth and Discontinuous Material Inhomogeneities

This paper describes a theoretical model and related computational methods for examining the influence of inhomogeneous material properties on the crack driving force in elastic and elastic-plastic materials. Following the configurational forces approach, the crack tip shielding or anti-shielding due to smooth (e.g. graded layer) and discontinuous (e.g. bimaterial interface) distributions in material properties are derived. Computational post-processing methods are described to evaluate these inhomogeneity effects. The utility of the theoretical model and computational methods is demonstrated by examining a bimaterial interface perpendicular to a crack in elastic and elastic-plastic compact tension specimens.     

Luminescence of SrGdGa3O7:RE(RE = Eu, Tb) phosphors and energy transfer from Gd to RE

Eu³⁺- and Tb³⁺-activated SrGdGa₃O₇ phosphors were synthesized by the solid-state reaction and their luminescence properties were investigated. Sr(Gd_1 − xEu_x)Ga₃O₇ and Sr(Gd_1 − xTb_x)Ga₃O₇ formed continuous solid solution in the range of x = 0-1.0. Unactivated SrGdGa₃O₇ exhibited a typical characteristic excitation and emission of Gd ion. The SrGdGa₃O₇:xEu³⁺ and SrGdGa₃O₇:xTb³⁺ phosphors also showed the well-known Eu³⁺ and Tb³⁺ excitation and emission. The energy transfer from Gd³⁺ to Eu³⁺ and Tb³⁺ were verified by photoluminescence spectra. The dependence of photoluminescence intensity on Eu³⁺ and Tb³⁺ concentration were also studied in detail and the photoluminescence (PL) intensity of SrGdGa₃O₇:Eu and SrGdGa₃O₇:Tb were compared with commercial phosphors, Y₂O₃:Eu and LaPO₄:Ce,Tb. The luminescence decay measurements showed that the lifetimes of Eu³⁺ and Tb³⁺ were in the range of microsecond. The energy transfer from Gd³⁺ to Tb³⁺ was also observed in decay curve.     

Stress analysis around crack tips in finite strain problems using the eXtended finite element method

Fracture of rubber‐like materials is still an open problem. Indeed, it deals with modelling issues (crack growth law, bulk behaviour) and computational issues (robust crack growth in 2D and 3D, incompressibility). The present study focuses on the application of the eXtended Finite Element Method (X‐FEM) to large strain fracture mechanics for plane stress problems. Two important issues are investigated: the choice of the formulation used to solve the problem and the determination of suitable enrichment functions. It is demonstrated that the results obtained with the method are in good agreement with previously published works. Copyright © 2005 John Wiley & Sons, Ltd.     

电镀厂化验废液中银的再生利用

针对电镀厂化验室产生的含银废液的再生利用方法进行了研究，建立了从电镀厂化验废液中回收银，并直接制成分析纯硝酸银的工艺。该方法简单可行，对减少化验室废水对环境的污染，提高银二次资源的利用率，降低化验成本具有现实意义。该工艺可推广到硝酸银消耗量较大的其他化验室。     

A single-stage pulse tube cooler reached 12.6 K

A single-stage G-M type pulse tube cooler (PTC) was designed and tested to explore the lowest attainable refrigeration temperature and to further improve the cooling performance in the temperature range of 15-40 K. The magnetic material Er₃Ni was used as part of the regenerative material besides the phosphor-bronze and the lead so as to improve the efficiency of the regenerator. With an input power of 6 kW, a lowest no-load refrigeration temperature of 12.6 K was obtained, which is a new record for the single-stage PTC. The cooling capacity at 15-40 K was also significantly improved, which may extend the application of the single-stage PTC for the cooling of superconductors and cryopumps.     

《染整工艺教程》CAI课件的开发

根据作者开发《染整工艺学》多媒体CAI课件的经验，介绍了该课件的特点、主要内容和多媒体素材以及制作该课件所需的软硬件环境和制作方法。认为制作《染整工艺学》多媒体课件必须充分利用多媒体形象、生动、直观、信息量大的特点，并利用多媒体课件的交互功能，体现染整工艺基本理论和生产实践经验，以利于教师的课堂教学和学生的自学。