基于单片机AT89C51的全自动变频恒压供水系统

介绍了一种新型的变频恒压供水系统.该系统根据供水管网的用水情况,调整水泵投入台数及转速,实行全自动恒压供水,达到高效节能的目的;其水泵用变频器软启动,对电网无冲击,能延长水泵的使用寿命.     

仇视、狂热与压力——中古欧洲十字军反犹动机解析

关于十字军的反犹动机问题,学界观点纷呈。在各种观点中,基督教的反犹主义意识是主导因素,它推动了长达百年的反犹活动持续发生,而当时狂热浓厚的宗教氛围则为反犹暴行提供了合适＂土壤＂,商品经济所带来的巨大压力则成为了反犹的突破口。诸多因素综合作用遂导致反犹活动频繁上演。     

AGING,RETIREMENT AND SOCIAL SECURITY IN A MODEL OF INTEREST GROUPS

The assessment of the degree of genetic variation in a natural population, and the nature of that variation, is of central importance in both theoretical and applied population studies. Two “variance” results in population genetics theory are presented. For the first, expressions are found for the expected difference in the estimates of genetic variation in a population obtained by two investigators sampling from the same population in the same generation. The second result concerns the question of whether the degree of genetic variation in a population is best estimated by using the number of alleles observed in a sample of genes or by the number of polymorphic sites observed in the sample. For some combinations of the actual degree of variation and the sample size the former is preferred while for other combinations the latter is preferred. The reason for this is discussed.     

城市供水管网系统工况分析的研究

通过分析实际供水管网系统的特征，对管网工况分析所涉及的几个尚未解决的计算问题进行了研究，提出了用计算机进行工况分析的思路与框架，为管网运行调度及研究管网水质模型打下了良好基础．     

论汉晋招隐诗的两次复变及文化动因

招隐题材自西汉至西晋经历了两次变异 ,即从招还隐士到寻访隐士再到追求适性之隐而招还山林之隐的复变。从汉晋两朝的社会政治、哲学思潮、文人心理视点 ,探讨《招隐》诗起伏衰长的深刻动因 ,可以把握中国古代隐逸的历史走向。     

Getting There: The Unfolding Potential of Psychoanalysis, A Personal View

Even though psychoanalysis has the potential to free the mind it can also (however unwittingly) be used to bind it. This paradoxical tendency is especially noticeable in some psychoanalytic trainings, when students can be under pressures to comply with accepted theory and practice and, in some cases, to toe the line in their training analysis and/or in their supervised cases. We therefore have to be increasingly mindful of the ways in which our training of psychoanalytic students can foster a false extension of psychoanalysis, by which the practitioner can become bound to a theory rather than be freed by it.     

自我表露及其作用

有关自我表露的研究是心理学关于自我研究的一个重要领域,心理学家发现,展示个人信息的行为有重要的心理学意义.自我表露是个人成长和自我实现的必要环节,是个体印象管理和应对压力的有效方式,也是心理治疗的重要途径.     

21世纪初湖北经济增长的重点难点及相关对策

湖北如何在 2 1世纪初 (前 15年 )抓住机遇加快发展 ,使之跃升为全国发达的省份之一 ,是每个湖北人都十分关心的问题 ,本文拟对下世纪初湖北经济增长的重点和主要难点问题作一些探讨和分析 ,并从微观规制和宏观调控相结合的角度 ,对促进增长要素的改善 ,从而解决我省经济增长的重点和难点问题 ,提出了相关政策建议     

镇泾地区地层异常压力与油气运聚关系

针对镇泾地区长₆~长₈层位油气运聚方向不明确致使该区油气勘探受阻的现状，采用异常压力研究的新思路来寻找油气勘探认识上的突破口。利用声波测井资料制作近50口井泥砂岩压实曲线、计算每口井的压力系数，结合镇泾油田的地质背景，研究镇泾地区地层的压实特征及异常压力与油气成藏条件和运移成藏过程之间的关系，并将各种因素的时空配置关系有效地结合起来研究镇泾地区的成藏问题。对进一步论证鄂尔多斯盆地西南部延长组的勘探潜力有重要意义。