三个泉倒虹吸镇墩混凝土温控与防裂措施

根据特别严寒地区气候特点,通过原材料控制、配合比优化、温度应力仿真计算,采取"两掺一低"、加冰水、循环水冷却、XPS表面保温等综合措施对新疆三个泉倒虹吸镇墩大体积混凝土实施温度控制,工程建成后通过2年多的运行检验,至今未见裂缝,表明温控效果明显。     

Assessing program effects in the presence of treatment—baseline interactions: A latent curve approach.

Methods for assessing treatment effects of longitudinal randomized intervention are considered. The focus is on modeling the nonlinear relationship between treatment effects and baseline often observed in prevention programs designed for at-risk populations. Piecewise linear growth modeling was used to study treatment effects during the different periods of development. A multistep multiple-group analysis procedure is proposed for assessing treatment effects in the presence of nonlinear treatment-baseline interactions. Standard errors of the estimates from this multistep procedure were obtained using a bootstrap approach. The methods are illustrated using data from the Johns Hopkins Prevention Research Center involving an intervention aimed at improving classroom behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

连续概念应用中不容忽视的问题

指出了利用连续概念讨论初等函数连续性的教学中不容忽视的问题。     

A longitudinal study of children's depressive symptoms, self-perceptions, and cognitive distortions about the self.

This longitudinal study examined how depressive symptoms relate to children's self-perceptions and to estimates of children's cognitive distortions about the self in a nonclinical sample of children who were followed from 4th grade (n=248) through 6th grade (n=227). Report card grades measured children's academic competence, and teachers' ratings of children's level of peer acceptance at school indicated social acceptance. Self-reported depressive symptoms predicted a change in children's negative views of the self. Moreover, the self-perceptions of children who exhibited more symptoms of depression appeared to reflect an underestimation of their actual competence. Children's negative self-perceptions and underestimations about the self were not associated with a subsequent change in depressive symptoms. The implications of the findings for cognitive theories of depression and future research with this population are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Short-term group play therapy with Chinese earthquake victims: Effects on anxiety, depression and adjustment.

Investigated the effectiveness of short-term child-centered group play therapy in elementary school settings with Chinese children in Taiwan who experienced an earthquake in 1999. 65 children (aged 8-12 yrs) were screened. Children in the experimental group scored significantly lower on anxiety level and suicide risk after play therapy than did children in the control group. The effects of the treatment support previous studies of play therapy with American children. These findings reveal the possibility of disaster intervention services adopting Western helping techniques with school children of non-Western cultures. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The likely origin and calculability of physical constants

A simplified version of a theory in which the values of the fundamental constants are not specified but calculated is presented. In a development of existing research, self-structurization of a quantum ensemble of events is modeled, for which a hypothetical basis for the unity of measurements arises in the form of a rigorous system of elementary particles and their properties. __________ Translated from Metrologiya, No. 4, pp. 3–14, April, 2008.     

A threat-appraisal perspective on employees' fears about antisocial workplace behavior.

This article uses a threat-appraisal model to examine the antecedents and consequences of antisocial behavior in an urban public school system. Teachers (compared with nonteachers) and middle and high school employees (compared with elementary school employees) reported higher levels of exposure to and fears about antisocial behavior. A path analysis demonstrated that threat appraisals partially mediate the relationship between antisocial behavior and job satisfaction and indirectly affect turnover intentions. These effects were consistent across high- and low-contact job types and across elementary, middle, and high school employees. The authors used the threat-appraisal model to describe the consequences of different interventions and found empirical evidence for employee voice and security measures as intervening variables. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Photoinjected carrier''s acoustic plasma oscillations

Resorting to the Nonequilibrium Statistical Operator Method (NSOM) we calculate the Raman spectrum of the double (electrons and holes) photoinjected plasma in direct-gap polar semiconductors. It allows us to identify four types of elementary excitations in the photoexcited carrier system. Besides the expected Raman bands corresponding to single quasi-particle excitations and a higher frequency plasma wave (labelled optical), there appear two low-frequency bands. They show a linear energy dispersion relation and are labelled acoustic plasma oscillations. While the optical plasma branch is ascribed to the out of phase collective movement of both types of carriers interacting through the bare Coulomb interaction, the acoustic branches are ascribed to the in-phase oscillation of each type of carriers interacting through the screened part of Coulomb interaction.