谐振子量子制冷循环性能的优化分析

基于量子主方程和半群逼近研究以谐振子系统为工质，由两个等温和两个等谐振子数过程组成的不可逆谐振子量子制冷循环的一般性能特性，导出了制冷循环的制冷系数、制冷率、输入功和熵产率等重要参数的一般表达式．并详细讨论了高温极限下谐振子量子制冷循环的优化性能，导出了最大制冷率和相应的制冷系数．所得结论可为非常规工质低温制冷循环的优化设计提供理论基础．     

演唱的谐调及美感分析

演唱艺术的审美是多侧面的,是综合性的体现,要求演员具备一些相应的综合素质。然而,所有日积月累形成的专业素质和能力,都要通过舞台上短暂的演和唱的良好协调传达给观众。这种能力只有演员经过长期的学习和实践不断加强和完善,使之得到平衡、协调的发展,才能提高整体的艺术审美层次。     

基于C/S模式的企业MIS系统中性能优化的实现

论述了大型数据库应用系统的优化技术和方法.首先提出优化的必要性,然后论述了基于C/S模式的企业MIS系统的几种优化原则和部分优化技术,最后介绍了在开发黄石鑫宝管业有限公司的企业MIS系统的过程中用到的几种优化技术和方法.     

Doodling Effects on Junior High School Students’ Learning

The main purpose of this study was to assess the effects of doodling on the learning performance of high school female students in Tehran. The design of this research was a pre‐test–post‐test with a control group. A group of 169 junior high school 12–13 year‐old students was chosen for this study. After being taught a section of the Natural Science course, the students were asked to answer questions related to the lessons. After that, their grades were used as the pre‐test scores. The post‐test was carried out after the devised treatment. During ten sessions of the same course and teacher, the students were each given a blank sheet of paper and were asked for doodling if they felt like doing it. After each session, a couple of relevant written questions were asked to evaluate how well students had learned the lessons. The experiment and control group both consisted of 27 randomly selected students; participants in the experiment group were doodlers and those in the control group did not doodle. To evaluate the doodling effect a t‐test analysis was performed. Comparison of the grades showed that the experiment group outperformed the control group significantly.     

浅谈音乐表演中的联想

音乐表演属于创造性的音乐实践活动，为了更为准确的表达作品情感，音乐表演者在表演时要根据作品内涵充分展开联想，并通过各种途径丰富自己的联想。     

PEMFC分散发电系统的压力控制研究

NomenclatureA-area ( m2)Dw-membrane water diffusivity ( m2/s)F-=96 487I-current (A)M-molecule mass (kg/mol)T-temperature (K)W-mass flowrate (kg/s)cw-water concentration in membrane ( mol/m3)m-mass (kg)n-cell numbernd-electro-osmotic drag coefficientp-pres…     

复合酸化剂对断奶仔猪抗腹泻效果和生产性能的影响

通过体外实验和断奶仔猪饲养试验研究了包被复合酸化剂(简称复合酸化剂)的抑菌效果及其对断奶仔猪抗腹泻效果和生产性能的影响.体外试验结果表明,采用抑菌圈法对不同浓度的复合酸化剂进行比较时,以0.2%的浓度显示出较强的抑菌效果,对大肠杆菌、沙门氏菌和乳酸杆菌的抑菌圈直径分别达到了15.0、16.8和13.0 mm.仔猪饲养实验结果表明:与不合酸化剂的对照组或有机酸化剂组相比,在基础日粮中添加了0.2%的包被复合酸化剂可以进一步提高仔猪的生长速度及饲料转化率,同时可以降低仔猪的腹泻率.     

制造业管理者元胜任力与行业胜任力和绩效之间关系的实证研究

本文利用元胜任力与绩效问卷和制造业管理胜任力问卷进行了大量的调查,研究表明:元胜任力包括思维能力、学习运用能力和自我发展能力三个因子;思维能力能够有效的促进周边绩效和适应性绩效,学习运用能力能够较好的促进整个绩效;思维能力、市场营销策划能力和产品系统管理能力是制造业管理者绩效的有效预测指标。     

The effectiveness of workflow management systems: A longitudinal study

Workflow management systems coordinate and allocate work through the various stages of executing business processes. The benefits of such systems appear pervasive, but no hard data is available that confirms that their implementation improves organizational performance. In part, this is due to the difficulty of measuring the effects of enterprise-wide initiatives in general. In this paper, the results are presented of a longitudinal, multi-case study into the effectiveness of workflow management technology. The study builds on a novel methodology that combines field work and computer simulations. Through its application, the contribution of this technology to conduct business processes faster and with less effort could be quantitatively assessed. Surprisingly, only a fraction of the projects that were followed in this longitudinal study led to a fully operational implementation of a workflow management system at all. Even so, in most of the projects where such a system was introduced this resulted in substantial improvements. We present success and fail factors for the implementation of this technology within organizations, which we inferred from a follow-up analysis. The novel methodology presented in this paper is thought to be of value to track the performance effects of introducing other technologies or organization concepts as well.     

高校图书馆阅读推广活动的绩效评估实证研究——基于吉首大学图书馆调查分析

针对高校图书馆重阅读推广,轻绩效评估的现象,构建了一套阅读推广活动绩效评估体系。本文以吉首大学图书馆为例,从活动组织、参与者评估、校园影响3个方面对活动全程进行绩效评估,并对评估结果进行分析,提出相应对策。