Identity Maintenance and Loss: Concurrent Processes Among the Fransaskois.

Research has shown that, among minority group members, there is a tendency to adopt outgroup attributes at the loss of ingroup cultural elements. However, studies have also documented the occurrence of cultural revitalization and ethnic maintenance. While current theories of intergroup relations do delineate conditions under which either may occur, none have examined the processes responsible for their co-occurrence. This study is therefore meant to investigate if and by what mechanism the effect of cultural loss and maintenance may occur concomitantly. Two dimensions of acculturation (ethnic identity and adjustment), along with initial aspects of contact mediated by communication and social support processes, were examined as they occur among French Canadians living in a province of Western Canada. High school and junior high students (N = 151) attending French schools participated in the study. As predicted, the importance of contact, social support, and language confidence for shaping identity and adjustment was supported. While there were subtractive trends as a result of learning the second language, the additive benefit of identity maintenance and well-being was also apparent. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Categorizing Others: The Dynamics of Person Construal.

A fundamental question in social cognition is whether people categorize others on the basis of the social groups to which they belong. Integrating ideas from related work on face processing, the current research explored the emergence and boundary conditions of person categorization. Using speeded responses to facial stimuli as a marker of category activation, the authors showed in 3 experiments that person categorization: (a) occurs only under active-encoding conditions and (b) does not extend to applicable but task-irrelevant categorical dimensions, but (c) is sensitive to overlap in the perceptual features that support multiple categorical construals. The authors consider the implications of these findings for models of social-cognitive functioning and the component processes that support person perception. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Explicit Wei–Norman formulae for matrix Lie groups via Putzer's method

The Wei–Norman formula locally relates the Magnus solution of a system of linear time-varying ODEs with the solution expressed in terms of products of exponentials by means of a set of nonlinear differential equations in the parameters of the two types of solutions. A closed form expression of such formula is proposed based on the use of Putzer's method.     

Optimization on Lie manifolds and pattern recognition

Several pattern recognition problems can be reduced in a natural way to the problem of optimizing a nonlinear function over a Lie manifold. However, optimization on Lie manifolds involves, in general, a large number of nonlinear equality constraints and is hence one of the hardest optimization problems. We show that exploiting the special structure of Lie manifolds allows one to devise a method for optimizing on Lie manifolds in a computationally efficient manner. The new method relies on the differential geometry of Lie manifolds and the underlying connections between Lie groups and their associated Lie algebras. We describe an application of the new Lie group method to the problem of diagnosing malignancy in the cytological extracts of breast tumors. The diagnosis method that we present has a mean sensitivity of 98.086% and a predictive index of 0.0602, making it the most accurate and reliable diagnostic method reported thus far.     

驻点法在桩群模拟中的运用

采用有限元方法建立了二维平面水流模型,并引入驻点的概念模拟水中桩柱对水流的影响,即在计算中将网格节点设置于桩柱处,并在该节点设置滞流边界条件,即流速为0 m/s.以长寿朱家坝码头的高桩码头方案为算例进行了模拟计算,结果表明该方法可以较好地模拟桩群对水流流速、流态的影响.     

Strategic orientation and performance of internet-based businesses

Abstract. Many of the pure internet‐based businesses that proliferated over the past 5 years have encountered serious problems as their lofty valuations have plunged. Industry observers have attributed this phenomenon to a variety of factors, generally framed in terms of poor conceptualization or implementation of the ‘business model’. This study explores an often‐used concept in strategic management called ‘strategic orientation’ and applies it to internet‐based businesses. Based on an analysis of over 100 public businesses, firms that cluster together with similar strategic orientation are observed. These strategic groups are then analysed for performance differences. The results are discussed with the intent of learning from the dot‐burn effects as we evolve to the next generation of internet‐based business.     

高职院校英语教学改革初探

高职院校英语教学改革必须围绕高职教学目标,形成自己的特色。实施教学目标管理战略,进行全面质量管理,是发展高职院校英语教学改革的有效途径。     

计及转速平滑恢复的双馈风电机组自适应频率控制策略

为解决现有双馈风电机组频率控制策略不能充分利用转子动能支撑电网频率及风机转速恢复造成的二次频率冲击问题,提出了一种计及转速平滑恢复的双馈风电机组自适应频率控制策略.首先在电网频率支撑阶段,借助指数函数将风电机组频率控制系数和电网频率偏差建立耦合关系,使频率控制系数随频率偏差增加而变大,从而使风电机组在频率支撑阶段释放更...     

Emulsion copolymerization of styrene and n-butyl acrylate in presence of acrylic and methacrylic acids: Effect of pH on kinetics and carboxyl group distribution

The batch emulsion copolymerization of styrene with n-butyl acrylate in the presence of acrylic and methacrylic acids was investigated. Values of reaction rate and conversion observed at different pH values were examined. The effect of pH on the glass transition temperature of the polymers was also investigated and the results compared with model predictions. Its effect on the distribution of the carboxyl groups at different positions within the emulsion system (surface and core of particles, and in the aqueous phase) was also analyzed. Three methods were used to measure the number of carboxyl groups: conductimetry, organic phase potentiometry, and titration with a solution of sodium hydroxide in methanol. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2343–2355, 1997