高效液相色谱法测定尼群地平

采用高效液相色谱法 ,以HypersilC1 8( 4 .6mmi.d .× 2 5 0mm ;5 μm)为色谱柱 ,甲醇 水 (体积比为 70 :30 )为流动相 ,检测波长炒 2 37nm ,研究尼群地平性质。在质量浓度 1 2mg/L～ 1 2 0mg/L时质量浓度与峰面积线性良好 (r =0 .9996 ) ,日内差、日间差RSD为 0 8%和 1 2 % (n=5 )。方法简便、准确。     

空气相对湿度对空气源热泵热水器性能的影响

通过对空气源热泵热水器的性能进行实验研究,考察了空气的相对湿度对其性能的影响。实验结果表明：空气的相对湿度对蒸发压力、COP和吸气温度等性能有一定的影响;相对湿度的增大会导致蒸发器表面冷凝水增多,有效润湿面积增大,空气侧与制冷剂侧换热系数增加,最终导致蒸发器潜热换热量增加,从而强化了传热。     

Young people’s mental health: Exploring the gap between expectation and experience

ABSTRACT

Background

The proportion of young people suffering from poor mental health is on the increase, including in Scandinavian countries. This increase seems paradoxical, as Scandinavian countries are among those with the lowest degree of material deprivation, economic inequality, and social exclusion.     

政府绩效评估中的公众参与问题研究

我国公民可以通过多种方式参与政府的绩效评估,但在在政府绩效评估的过程中受多种因素的擎肘,导致公众的参与意识不强,参与热情不高.本文分析了公众参与中存在的问题,并提出通过确立公民满意度作为政府绩效评估的最高原则和引入电子政务等手段,建立完善的政府绩效评估的公众参与机制.     

地方高校内控执行力“人本化”路径探究

当前我国地方高校的内控机制依照企业管理五因素内控体系建立,存在内控体系不完整、偏离高校治理体系现代化的要求以及内控主体缺乏人本内涵等问题。在地方高校正面临实现内涵式发展的时代要求下,应坚持“以人为本”理念和价值目标导向,紧紧抓住高质量人才培养和可持续发展等核心问题,通过融入“以人为本”理念的内部控制流程再造,实现内部控制价值、质量和公平的有机统一,确保内部控制得到有力执行,不断提升内部控制质量、效益和治理效能。     

The development of dynamic inquiry performances within an open inquiry setting: A comparison to guided inquiry setting

Dynamic inquiry learning emphasizes aspects of change, intellectual flexibility, and critical thinking. Dynamic inquiry learning is characterized by the following criteria: learning as a process, changes during the inquiry, procedural understanding, and affective points of view. This study compared the influence of open versus guided inquiry learning approaches on dynamic inquiry performances among high‐school biology students. We hypothesized that open inquiry students who engage in the inquiry process from its initial stage, participating in the decision making process of asking inquiry questions and planning all aspects of the inquiry, will outperform students who experienced guided inquiry, in terms of developing dynamic inquiry performances. Students were divided into two groups: guided and open inquiry learning approaches. Both groups were followed throughout their 2‐year inquiry learning process. The data sources included interviews, students' inquiry summary papers, logbooks, and reflections. A quantitative content analysis of the two groups, using a dynamic inquiry performances index, revealed that open inquiry students used significantly higher levels of performances in the criteria “changes during inquiry” and “procedural understanding.” However, the study's results indicated no significant differences in the criteria “learning as a process” and “affective points of view.” The implementation of dynamic inquiry performances during inquiry learning may shed light on the procedural and epistemological scientific understanding of students conducting inquiries. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 46: 1137–1160, 2009     

对电大教师绩效考核有效性的若干思考

电大教师绩效考核存在绩效考核指标体系欠科学、平均主义,忽略平时考核、对考核结果的反馈与应用不充分等问题,主要是由于对绩效考核缺乏科学理解,考核内容不够明确,考核过程缺乏客观性,缺少与考核配套的激励机制。可以通过转变观念,建立电大特色的教师考核指标体系,建立与绩效考核相配套的激励机制、反馈评价应用机制,将绩效考核与职业生涯规划相结合,提高绩效考核的有效性。     

交谊舞选项课学生体育成绩的评价体系与指标构建研究

运用文献资料、问卷调查等方法,结合交谊舞项目特点及教学实践情况进行分析,对交谊舞课程学生体育成绩的评价体系进行了构建,并对评价指标进行筛选,确定二级指标中的技术动作、协作意识、进步幅度和出勤情况作为主体评价指标,运用权重评分法对学生的学习成绩进行综合评价,通过综合评价指标正确引导学生,促进学生树立正确的体育学习观,以便更好地完成体育教学目标.     

太湖土著菌MC-LTH11的筛选及其对藻毒素-RR和-LR的生物降解(英文)

从太湖中成功筛选出一株能够同时降解微囊藻毒素-RR(MC-RR)和微囊藻毒素-LR(MC-LR)的土著细菌MC-LTH11.经鉴定,该菌属寡养单胞菌属,并含有mlrA基因.在含有藻毒素粗提物的培养基中,MCLTH11能够在6 d内将初浓度分别为37.13 mg/L的MC-RR和18.49 mg/L的MC-LR完全降解,并且降解速度受到pH值、温度、初始微囊藻毒素浓度和培养基种类的影响.此外,MC-LTH11能够在1 d内完全降解太湖水样中的微囊藻毒素.研究结果表明,寡养单胞菌MC-LTH11具备对微囊藻毒素污染水体的修复能力,并可能是太湖水华爆发后微囊藻毒素降解的重要因素.     

论同时履行抗辩权

同时履行抗辩权是合同履行制度当中的一项重要制度。我国司法实践中忽了这一规则的运用，使许多正当使同时履行抗辩权的被当作违约对待。在实践中如何正确适用同时履行抗辩权，对于维护交易秩序、保障交易安全，有着重要的意义。