IMS准备步入黄金阶段

尽管无线和固线运营商对IMS存在标准的争议及根本不同的方法,但支持者相信,这项技术将在今年爆发。经过了几年标准及兼容性的不确定之后,IMS技术已经走到了十字路口。运营商削减成本及拥抱下一代网络的承诺刺激着人们去接受它,但应用的缺乏阻碍了其大规模的部署。不过,许多IMS的支持者坚持认为,IMS将凭借固定和移动运营商在亚洲、欧洲及美国已经展开的部署在今年兴旺起来。     

Immobilization of Dicationic Mn(III) Salen in the Interlayers of Montmorillonite Clay for Enantioselective Epoxidation of Nonfunctionalized Alkenes

Dicationic chiral Mn(III) salen complex (0.4 mol%) immobilized in the interlayer of montmorillonite clay 4A, epoxidize bulkier alkenes (epoxide yield 68–99%) with high chiral induction (up to 95% ee) with a catalyst reusability of up to four cycles.     

Effects of group counseling on self-esteem.

Investigated the influence of group counseling on self-esteem, anxiety, depression, and hostility in 3 groups of adult women: 24 middle-class women; 9 women who received provincial social assistance (i.e., longer than 3 mo); and 15 who received city social assistance (i.e., less than 3 mo). All Ss completed pre- and posttests of the Tennessee Self-Concept Scale and the Multiple Affect Adjective Check List before and after a series of group counseling sessions on practical, personal, and social issues. Results show that the women receiving provincial social assistance had significant changes in the level of self-esteem; it is suggested that these women, nearly half of whom were either single or divorced (compared with Ss who received city social assistance who were almost all separated and the middle-class Ss who were almost all married), perceived a need change in their lives. Because of their relatively stable marital and financial status (i.e., husbands gone for some time and social assistance providing funds), they were not forced to spend a good deal of time in self-exploration and were consequently responsive to treatment. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Membrane concentration potentials across heavy metal soap membranes

The alumina mixed copper soap pellets of different fatty acids (C₆−C₁₆) have been prepared. The pellets are used as membranes of electropositive character. The concentration potential studies have been carried out with potassium chloride solutions. Transport number of counterions and selective ionic permeability through these membranes have been calculated. The values of both these parameters increase with increase in the number of C-atoms of the hydrocarbon chain of copper soaps. This seems to be due to lowering in solubility and increase in crosslinking in the membrane material.     

Industrial hydrogenation of rapeseed oil with nickel catalyst

Refined and deodorized rapeseed oil was hydrogenated using Girdler nickel catalyst at a starting temperature of 140 C and at 25 and 30 psig hydrogen gas pressures. The studies revealed that the hydrogenation was more effective, as determined by rate of decrease in iodine value (Wi js) and increase in the melting point, at 25 psig than at 30 psig. The rate of effectiveness was, however, not significant. The rate of hydrogenation was compared to cottonseed oil subjected to hydrogenation under identical conditions. Cottonseed oil showed a better, though insignificant, rate of increase in melting point per unit increase in time.     

Role of microstructure and residual stresses on fatigue crack initiation of carbonitrided steels

In this paper the role of microstructure and residual stresses on fatigue crack initiation of gaseous carbonitrided steels is examined. Optimum for austenite content in the case is investigated for microstructures containing bainite and for those without bainite. Fractographic study suggests subsurface initiation sites for notched specimens when austenite content is high and initiation sites at the surface when austenite is low.     

Upon sector elements for two-dimensional problems

Different sector elements for two-dimensional problems for linear elastic analysis are developed and their utility for different types of problems is discussed. One of these elements (Type 1) fulfils the rigid body criterion for the two translatory motions as well as interelement compatibility conditions. This element is used together with a triangular element for the solution of Kirsch's problem. A considerable accuracy of the results is obtained with a relatively small number of elements.     

Determination of compounding and external load characteristics of saturated cylindrical-rotor synchronous generators

The paper describes a method for predicting the load (compounding or excitation and external) characteristics of saturated cylindrical-rotor synchronous machines. The method is based upon the phasor diagram representation of a synchronous machine and utilizes a simple formula for approximating the magnetisation curve. This yields a closed form of expression for the excitation characteristics, while solution of the equations of the external load characteristics is carried out, easily, by using a simple iteration process. The validity of the approach is verified by tests.