复叠式相变蓄热热泵热水器的研究

为使热泵热水器在满足制热性的基础上兼顾经济性,提出了复叠式结构和蓄热器耦合的新型热泵热水器,探讨了它的性能,着重分析了经济性。结果表明该热水器的能效比高,工作温差大,适用区域广,在实行峰谷电价时经济性好,因而具有较高的应用价值。     

双解析函数在敞开曲线上的Riemann边值问题

研究双解析函数在光滑敞开曲线上的Riemann边值问题 利用解析函数Riemann边值问题的标准函数和特征双解析函数的Plemelj公式 ,得到了问题 (R)一般解的表示式 ,建立了问题 (R)的线性无关的个数与指标之间的关系     

唐代进士考试三场制度的形成与演变

进士考试三场制度最早形成于唐代。唐初进士科学只试对策，唐高宗晚年形成贴经、杂文、对策三场。唐中期三场考试偏重杂文，尤其重视诗赋考试。唐后期强调考试经史，五代时出现以义代贴经趋势，孕育着宋代进士考试的改革。     

实行项目化管理加强实验室建设

阐述了该校实验室建设与管理引入项目管理的理念,在具体实施过程中实行项目负责制、分等级补贴工作量的政策,对如何加强实验室建设与管理提供了可借鉴和参考的实验室建设经验。     

基于BIM的工程项目管理课程组合型案例教学改革

工程项目管理是土木类研究生一门重要的课程,具有理论性强、抽象的特点,适合采用案例式教学。BIM是工程建设领域的前沿技术,具有广阔的应用前景。从工程项目管理课程案例教学的必要性出发,分析当前案例教学法的局限,引出了结合BIM技术的组合型案例教学的内涵和教学构建,并从教学案例选取和作业案例难度两个方面对组合型案例教学的关键环节进行了讨论。以期能为工程项目管理的教学工作做出有益的探索。     

惰性浓盐介质法制备纳米晶的研究--纳米Mg(OH)2的制备

通过纳米Mg(OH)2粉体的制备说明，在一种本身不参与反应的惰性浓盐介质中进行沉淀反应，能够获得纳米尺度的产物，检索国内几大科技情报检索系统，未见报道。     

利用荷移光谱法测定可待因片剂的含量

本文研究了可待因与 7,7,8,8-四氰基对二次甲基苯醌 (TCNQ)的荷移反应 ,对反应条件进行了优化 .在丙酮介质中 ,二者在室温 (30℃ )中 30min即可形成 1:1荷移络合物 .分别在74 3和 84 0nm处有较强光吸收 .可待因浓度在 0 .6～ 7(g·mL-1范围内符合比尔定律 ,其表观摩尔吸光系数在 2 .3× 10 4～ 5 .1× 10 4;方法的相对标准偏差为 1.8%～ 2 .4 % (n =9) .     

Revisiting the Model Size Effect in Structural Equation Modeling

Fitting a large structural equation modeling (SEM) model with moderate to small sample sizes results in an inflated Type I error rate for the likelihood ratio test statistic under the chi-square reference distribution, known as the model size effect. In this article, we show that the number of observed variables (p) and the number of free parameters (q) have unique effects on the Type I error rate of the likelihood ratio test statistic. In addition, the effects of p and q cannot be fully explained using degrees of freedom (df). We also evaluated the performance of 4 correctional methods for the model size effect, including Bartlett’s (1950), Swain’s (1975), and Yuan’s (2005) corrected statistics, and Yuan, Tian, and Yanagihara’s (2015) empirically corrected statistic. We found that Yuan et al.’s (2015) empirically corrected statistic generally yields the best performance in controlling the Type I error rate when fitting large SEM models.     

阴香粉实病简况

本文简单介绍了阴香粉实病的症状、病原、发生规律和防治方法.     

The social construction of a Teacher Support Team: an experience of university lecturers’ professional development in STEM

Abstract

This paper focuses on understanding and exploring how a group of university engineering and science tutor educators learn and assimilate new conceptions about their role in the face of the forces of globalisation that are transforming the system of higher education. This research paper adopts the notion of the Teacher Support Team (TST) as developed by Daniels and grounded in Vygotsky’s sociocultural account of the social formation of mind. These structures of meaning provide insight into the role played by the context, the interactions, the needs and the demands of actual activities, agreements and learning processes that this group of STEM lecturers undertook as they sought to transform their usual teaching methods that were focused on individual and isolated work in order to create more innovative practices and impact on their students’ performance. The analysis of this experience, which was based on the epistemological principles of the sociocultural approach, focused on the educational model that emerges from needs that are perceived and shared through the group’s interactions, as well as the transitions that such a team undergoes in its actions and decisions.