离子晶体外表面束缚极化子

本文计及表面光学声子的作用以及像电荷的作用,采用变分方法对一些材料外表面束缚极化子的基态能量和自陷能作了数值计算,并对结果进行了讨论,发现:对于Ⅰ—Ⅶ、Ⅱ—Ⅵ,Ⅲ—Ⅴ化合物的外表面,均可形成稳定的束缚极化子,且由于表面光学声子的作用,使这一杂质态更加稳定。     

Theoretical consideration of effect of fishing mortality on growth and reproduction of fish populations

Summary An increase in fish mortality due to fishing can theoretically change the growth and reproduction of fish populations from the viewpoint of adaptation. We address the issue of how an iteroparous fish should convert surplus energy into somatic growth and reproduction at each age under given conditions of mortality. A model of life history, which maximizes the net reproductive rate using the discrete maximum principle, is improved employing a new relationship between body weight and surplus energy which we have recently proposed. The model is applied to the North Sea plaicePleuronectes platessa, for which it has been reported that the average length of young fish had increased whereas that of old ones had decreased for some decades. Although the model cannot directly explain the former phenomenon, the two phenomena can be interpreted as a change in the optimal life history due mainly to an increase in mortality.     

促进我国企业海外能源投资的国际法层面探析

分析了当前我国企业海外能源投资所面临的国际法制困境，指出我国政府应积极行动，力求与国外签订有利于我国企业海外能源投资的能源合作双边协定，并参与区域性及全球性有关国际投资、能源合作规则的制定，从而为企业海外能源投资营造有利的国际法制环境。     

榆林能源化工基地产业依存度分析

以2002年陕西省的投入产出表为依据,编制2002年榆林能源化工基地的投入产出表,对2002年榆林能源化工基地的产业依存度状况进行分析;结合2006年榆林统计年鉴编制出2005年榆林能源化工基地的投入产出表,分析2005年榆林能源化工基地的产业依存度状况并与2002年的进行比较。结果表明:能源化工产业各部门之间的依赖关系越来越紧密,各行业对自身的依赖程度在增加,尤其是煤炭开采的独立性增强,与其他产业的关系密切。     

Child custody issues and co‐occurrence of intimate partner violence and child maltreatment: controversies and points of agreement amongst practitioners

The situation of families undergoing separation in a context of co‐occurrence of intimate partner violence (IPV) and child maltreatment raises certain issues related to child custody. The results presented in this paper were collected and analysed within the framework of a qualitative study aiming to identify the principal points of agreement and the main controversies amongst practitioners in several different types of organizations. Focus groups were held with a total of 43 practitioners from six different settings concerned with child custody in cases of co‐occurrence of IPV and child maltreatment. Although they agreed on the importance of ensuring the safety of victims of violence, their views diverged on three points: (1) the importance of preserving the father–child relationship; (2) collaboration between voluntary organizations and semi‐voluntary or legal agencies; and (3) consideration of cultural differences.     

经济冷战研究综述

经济冷战是冷战的重要组成部分.西方学术界,特别是20世纪八、九十年代新档案解密以来,在宏观及微观研究中都取得了丰盛的成果,本文试图从其起源问题及其他问题两方面来分析.中国学术界在这一领域成果相对有限,主要是对经济冷战宏观性地描述及对具体事件的勾画.     

卤化物的稳定性

本文利用热力学原理,计算晶格能和自由能变,根据晶格能及自由能变来判断离子型卤化物的稳定性。     

塑料注射机节能问题的研究与探讨

本文针对 XS—ZY—125型塑料注射成型机,分析了现行通用的双联泵供油液压系统耗能大的原因。介绍了压力流量补偿负荷传感液压系统在注射机上应用的基本原理。通过应用上述两种液压系统分别驱动同一台注射机的生产运行对比试验和能耗测试分析,证明压力流量补偿负荷传感液压系统具有十分显著的节能效果。通过经济效益估算分析,指出进一步开发压力流量补偿负荷传感液压系统在注射机上的应用,不仅具有十分显著的经济效益,而且具有很大的社会效益。     

Developing “A Framework for Planning U.S. Federal Statistics, 1978–1989”

The Statistical Policy Division of the Office of Management and Budget has the overall responsibility for the planning and coordination of U.S. government statistics. The present staff of the Statistical Policy Division is attempting, through an integrated publication entitled “A Framework for Planning U.S. Federal Statistics, 1978–1989,” to state its perspective on necessary developments in the coming years. This article illustrates the character of the Framework materials and outlines the process for public review and comment on this undertaking.     

我国能源部门产业关联分析 ——2002年投入产出表系列分析报告之六

 本文利用我国2002年投入产出表和改进的结构系数分析了我国主要的能源部门（包括一次能源和二次能源）与国民经济各部门之间的产业关联度。从各个能源部门与国民经济的不同关联效应出发，对我国能源产业多元化的发展策略进行了分析。