Abstract:本文研究了在混合表面活性剂SDBS和聚乙二醇辛基苯基醚(OP)共存下,meso-四(3-溴—4-羟基—5-甲氧基苯)卟啉T(BHMOP)P与钯的显色反应.并以该反应为基础建立了高灵敏度的痕量钯的光度分析法.钯与该显色剂形成1:2的配合物,其表观摩尔吸光系数在422nm处为1.27×10~5L·mol~(-1)·cm~(-1).钯量在0.0-12μg/25ml范周内服从比尔定律.本法用于合成样品中钯的测定,结果满意.

Abstract:The phyico-chemical problem in the acid leaching-the key step of the chemical-mechanical treatment process for producing pure copper powder directly from the scraps of normal brass is mainly discussed, and the cause of copper deposition is explained. The

Abstract:We prove in the paper, under suitable hypotheses,that all solutions of a certain class of nonlinear neutral delay differential equatinons oscillate if and only if all solutions of an associated linear equation with periodic coefficients oscillate.

Abstract:In this paper we define a class of biased linear estimators for the parameter matrix in the multivariate linear model with deficient rank and discuss some important properties. We reduce the estimation problem in the deficient rank model to the one in the

Abstract:This paper presents the algebraic stability concept for one-stage one-step multiderivative methods, according to the weak algebraic stability concept on multiderivative methods in the paper[1]. Some sufficient,sufficient and necessary conditions for the m

Abstract:In this paper,we proved the existence of generalized solution for the eigenvalue problem of elliptic system with splitting coefficient,where the eigen exponent is allowed to exceed the Sobolev imbedding exponent.

Abstract:Countability axioms,separability and connectedness are introduced and investigated for a de Morgan algebra of topology. Thus the scope of a de Morgan algebra of topology is extended.

Abstract:本文在文献［１］基础上，运用金相，电化学方法研究了５０Ｍｎ１８Ｃｒ４电机护环钢依照ＱＨＪ－７９试验标准在硝酸盐介质中应力腐蚀开裂（即ＳＣＣ）的性质，结果指出，此体系中ＳＣＣ的控制过程为阳极溶解。

Abstract:In this paper,the operating principle of an active load oven is expouded. The expression of the reducing factor for calculating its static characteristics is derived, and the performances and applications of this oven are evaluated.

Abstract:本分析并改进了温补晶振的补偿网络，运用计算机技术等设计了在－５５℃至＋１０５℃内都能良好地工作，且频率稳定度优于±２．５×１０＾－６的小体积，低功耗模拟温补晶振，其主要指标已达到国外同类产品的水平，弥补了种类晶振温度适应范围太窄的缺陷。

Abstract:In this paper,the motion-errors of a table for a precision boring machine are analysed and calculated. The accurate formulas of the motion-errors for the table are derived and the numerical results are given. Based on the present work,it is useful to regu

Abstract:用电沉积法制备Ｍｏ－Ｗ－Ｎｉ－Ｐｂ－Ｃａ多元活性阴极，研究了在０．５ｍｏｌ／Ｌ Ｈ２ＳＯ４中的析氢反应，结果表明，多元阴极具有较高的电催化活性，其析氢过电位比软钢阴极降低３０５ｍＶ，ｉ０提高三个数量级，且有较好的稳定性，并用光电子能谱研究了表面组成和结构。证实表面有：Ｎｉ，ＮｉＯ，ＭｏＯ２，ＭｏＯ＾２－４，ＷＯ３，ＰｂＯ２，ＰｂＯ，Ｃａ＾＋＋等物质。

Abstract:用恒温热重法测定了热压ＳｉＣ－Ａｌ２Ｏ３复相陶瓷在１５００℃空气中的氧化增重速率，并研究其高温氧化行为。氧化动力学测定结果表明，热压ＳｉＣ－Ａｌ２Ｏ３复相陶瓷材料的氧化增重速率随氧化时间延长而减小；反应气体氧和反应气物气体ＣＯ通过氧化产物边界层的扩散过程与氧化反应过程相比是很慢的，成为氧化速率限制过程。

Abstract:Acoustic emission rate has been measured during proof tests of electric porcelain, the attenuation law of AE rate at constant load has been inferred from fracture mechanics of ceramics. This law was in good agreement with the result of test for electric p

Abstract:In this paper, the high activity and the biological effect of N_3~- have been explained from nuclear configuration, electronic configuration in molecular and valence methods, and have been demonstrated by enzyme inhibition test and insecticidal effect. Th

Abstract:The sophisticated surface modelling is one of problems in engineering design, and it is a difficult problem to engineers. This paper introduces development and application of the Swans software. Some examples show it is a powerful sophisticated surface mo

Abstract:In the controlling ari-fuel ratio of gasoline engine, it is necessary to monitor the change of dynamics of gasoline engine. This paper presents a data acquisition system and data management methods, which have been validated by experiments.

Abstract:Abstract The operational principle of switched-current circuits is introduced in this paper. A simple method for analysis of switched-current circuits is presented. Some recent developments on the switched-current filter designs are reviewed, and open pro

Abstract:In conventional fuzzy control systems, there are some defaults or shortcomings, such as the static errors, the inefficient performance of tracing set point. In order to solving the problem, this paper presents a parameters self-adjusting Fuzzy+I controlle

Abstract:According to the characteristics of the low frequency oscillation and starting with the damping classification, in this paper, the concept of the inherent state damping and inherent state damping coefficient matrix, which can reflect the influence of the

Abstract:In this paper, systematic experiment study of hydrostatic model for curves of local resistance coefficients and moment of flowing water of controlled back valve is carried out based on the similarity of water course. So we provide a scientific basis neces