Ni(OH)_2电极材料的XRD和Raman光谱表征

用 XRD和 Raman光谱等方法对几种典型球形 Ni( OH) 2 电极材料进行了表征 ,并分析了材料的表观形貌、掺杂元素和微观结构等对其充放电性能的影响 .结果表明 ,有较好填充性和充放电性能 Ni( OH) 2 电极材料所具有的特征为 ,颗粒的球形好且结晶完好 ,晶粒较小 ,较大的晶格参数 c,并在 51 0和 3596cm- 1 处可以生成 Raman光谱峰 ;而 XRD和 Raman光谱方法则是评价 Ni( OH) 2 电极材料性能的有效手段 .     

Mechanochemical Modification of Deoxypeganine Hydrochloride by Polyampholite

The solubility and dialysis of deoxypeganine hydrochloride and natural polyampholite were studied by IR spectra and x-ray diffraction analysis. Inclusion complexes form during mechanical treatment of a 1:1 mixture of deoxypeganine hydrochloride and natural polyampholite     

On the spectral equivalence of unconventional finite elements and their conventional relatives

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ,ｗｉｔｈｔｒｅｍｅｎｄｏｕｓｄｅｖｅｌｏｐｍｅｎｔｏｆｐａｒａｌｌｅｌｃｏｍｐｕｔｅｒｓ,ｔｈｅｐｒｏｂｌｅｍｏｆｈｏｗｔｏｃｏｎｓｔｒｕｃｔｅｆｆｅｃｔｉｖｅｄｏｍａｉｎｄｅｃｏｍｐｏｓｉｔｉｏｎｐａｒａｌｌｅｌａｌｇｏｒｉｔｈｍｓｆｏｒｌｉｎｅａｒｓｙｓｔｅｍａｒｉｓｉｎｇｆｒｏｍｔｈｅｆｉｎｉｔｅｅｌｅｍｅｎｔｄｉｓｃｒｅｔｉｚａｔｉｏｎｈａｓｂｅｃｏｍｅｔｈｅｆｏｃｕｓｉｎｔｈｅｆｉｅｌｄｏｆｓｃｉｅｎｔｉｆｉｃｃｏｍｐｕｔａｔｉｏｎａｌ…     

From Two-Point Closures of Isotropic Turbulence to LES of Shear Flows

We first recall the EDQNM two-point closure approach of three-dimensional isotropic turbulence. It allows in particular prediction of the infrared kinetic-energy dynamics (with ak ₄ backscatter) and the associated time-decay law of kinetic-energy, useful in particular for one-point closure modelling. Afterwards, we show how the spectral eddy viscosity concept may be used for large-eddy simulations: we introduce the plateau-peak model and the spectral-dynamic models. They are applied to decaying isotropic turbulence, and allow recovery of the EDQNM infrared energy dynamics. Anew infrared k ₂ law for the pressure spectrum, predicted by the closure, is also well verified. Assuming that subgrid scales are not too far from isotropy, the spectral-dynamic model is applied to the channel flow at h ₊= 390, with statistics in very good agreement with DNS, while reducing considerably the computational time. We study with the aid of DNS and LES the case of the channel rotating about an axis of spanwise direction. The calculations allow to recover the universal linear behaviour of the mean velocity profile, with a local Rossby number equal to −1. We present also LES (using the Grenoble Filtered Structure-Function Model), of a turbulent boundary layer passing over a cavity. Finally, we make some remarks on the future of LES for industrial applications. This revised version was published online in July 2006 with corrections to the Cover Date.     

On the picard group and the brauer group of a real algebraic surface

The map of the Brauer group of a real algebraic surface to the invariant part of the Brauer group of its complexification is studied. In this study, the real cycle map of the Picard group is used. Translated fromMatematicheskie Zametki, Vol. 67, No. 2, pp. 211–220, February, 2000.     

Analysis of Discretizations of Parabolic Problems in Pairs of Spaces

We examine single step time discrete approximations to an abstract Cauchy problem considered in a pair of Banach spaces, of which one (space of solutions) is densely embedded in the other (space of initial data). The stability and error analysis of such discretizations is carried out. Our approach is applicable to the analysis of approximations to parabolic PDE problems in various pairs of function spaces arising from practical needs. In the final part of the paper, we present a possible application of our results for studying a semi-discrete version of a model initial-boundary value problem of heat conduction.     

酸度分布-吸收光谱法用于灰色体系中食用色素的定量分析

利用合成色素随ｐＨ变化的人分布分数曲线和吸收光谱构成两维波谱信息,建立了灰色体系中色素的定量分析方法。约束背景双线性分解法（ＣＢＢＬ）结合数值遗传算法（ＮＧＡ）用于两维矩阵的数据处理。推导了型体总数与两维矩阵的有效秩之间的关系。吸光度矩阵的主成分数根据残余矩阵的残差平方和噪声水平相比较 确定,对标准样品及模拟灰色体系样品的研究表明该法确定的主成分数与理论值一致。对胭脂红、日落黄和柠檬黄的模拟灰色休     

The Genetic Sums' Representation for the Moments of a System of Stieltjes Functions and its Application

This paper deals with the spectral problems for high-order nonsymmetric difference operators. The method of investigation is based on the analysis of the genetic sums formulas for the moments of the operator. The parameters of these sums are shown to be connected with coefficients of the introduced vector Stieltjes continued fraction. The connections with vector orthogonality, Hermite—Padé approximation, and Hankel determinants are investigated. This gives a tool for the analysis of the solution of the direct and inverse spectral problem of the operator. It is applied to the integration of hierarchy of the discrete KdV equations. The existence of a global solution is proved. July 13, 1998. Date revised: July 12, 1999. Date accepted: July 26, 1999.     

Optimization Techniques for Solving Elliptic Control Problems with Control and State Constraints: Part 1. Boundary Control

We study optimal control problems for semilinear elliptic equations subject to control and state inequality constraints. In a first part we consider boundary control problems with either Dirichlet or Neumann conditions. By introducing suitable discretization schemes, the control problem is transcribed into a nonlinear programming problem. It is shown that a recently developed interior point method is able to solve these problems even for high discretizations. Several numerical examples with Dirichlet and Neumann boundary conditions are provided that illustrate the performance of the algorithm for different types of controls including bang-bang and singular controls. The necessary conditions of optimality are checked numerically in the presence of active control and state constraints.