实验室快速制作印制电路板后处理工艺研究

印制电路板(printed circuit board,PCB)是电子设备内部电子元件的主要载体。PCB设计和加工工艺是高校电子类专业学生必须掌握的专业技能,但是专业工厂批量加工PCB的工艺并不适合在高校实验室使用。给出了一种适合在校学生快速制作PCB的工艺路线,重点解决了"一图一板"加工中绿油阻焊膜和元器件标志快速印制的难题。     

歙县（深渡）方言对英语元音习得的迁移作用

文章基于元音格局的理论,通过语音实验的方法对歙县（深渡）方言为母语的学生在学习英语时的元音发音进行实验分析,考察母语对外语学习的影响。依据实验数据,分析学生在英语学习中方言母语元音对英语元音学习的影响,实验研究发现母语对英语元音的发音存在着重要影响。     

Experimental performance of moderate and high temperature heat pump charged with refrigerant mixture BY-3

Theoretical and experimental analysis of a new refrigerant mixture BY-3 was conducted based on a single-stage vapor compression refrigeration system. The water-water heat pump system used BY-3 to produce hot water when the low temperature was 20 ℃. The following results were obtained: the highest temperature at the condenser outlet reached about 85 ℃; when the difference between the water temperatures at the condenser outlet and the evaporator inlet was less than 40 ℃, the coefficient of performance (COP) was larger than 4; when the difference reached 55 ℃, the COP still kept 3; the discharge temperature of BY-3 was lower than 100 ℃, and the refrigerant vapor pressure kept lower than 1.8 MPa. When the water temperature at the condenser outlet reached over 85 ℃, nearly a 5 ℃ superheating temperature was maintained.     

学生转向：澳大利亚大学教育与高职教育衔接的有效路径

澳大利亚高等教育体系由大学教育和高职教育构成,尽管这两部分存有差别。但它们有共同的目标,即为学生提供所需的技能和知识,最终帮助学生在就业方面取得重大突破．这就意味着在两种教育形式间转向不仅是可能的,而且是十分有意义的。澳大利亚政府出于教育的有效性和平等性考虑,鼓励大学与职业学校间的学生转向。     

全民教育政策转移中的国际非政府组织——以全球教育运动联盟为个案

随着全球化的发展,各国在教育领域开展愈加丰富的全球教育合作与交流,跨国间教育政策的转移扩散日益成为一种普遍的社会现象和行为。其中,国际非政府组织的一些跨国的行为者,在传播教育基本价值与规范、促进国际教育合作交流、融合与扩散国际教育政策等方面日益显示出重要的作用。在全民教育政策的跨国转移扩散发展进程中,非政府组织通过跨国倡议网络机制发挥着重要作用。以全球教育运动联盟为个案,考察全球教育运动网络、传播全民教育政策过程中倡议的基本理念与采取的主要集体行动策略,将有助于更好地理解非政府组织在国际教育政策转移方面发挥的重要作用。     

地质类专业野外实习教学中学生角色的转换——以2011年秭归教学实习为例

本文以2011年秭归专业教学实习为例,提出地质类专业野外实习教学中角色转换教学方法,突出学生在专业教学实习中的重要地位,以学生为主角,以问题为导向,充分发挥学生的主动性和创造性,取得良好的教学效果。     

英语主语误用与中式英语

英语与汉语分属两个不同的语系。英语学习者在学习英语的过程中将本族的语言习惯和思维定势移植到英语学习中,形成母语负迁移。学生中式英语的根源即在于此。主语误用是造成中式英语的原因之一,具体表现为三种主语误用现象,即混淆主题与主语、主语缺失和主语使用不当。     

热网安全、可靠运行的分析践行

本文主要是针对系统设计的不合理性,导致供热时达不到设计热负荷,同时在运行中发现小的系统方面也存在不足,为此提出了可靠的技改方案,并付诸实施,保证了热网的安全、稳定、经济运行。     

利用多媒体促进英语文化教学的“折中”,发挥母语正迁移作用

当前英语教学中的文化教学对目标语文化过分重视,而对母语文化重视不够。外语教学所表现出的"折中主义"为语言教学提供了一个新的发展方向,因而文化教学在母语与目标语之间呈现"折中"是必然的。英语教学中有效利用多媒体能促进英语文化教学的"折中",发挥母语正迁移作用。     

Interventions supporting baccalaureate achievement of Latinx STEM students matriculating at 2-year institutions: A systematic review

Numerous national reports have identified the importance of significantly improving pathways that begin with Latinx students enrolling in 2-year institutions and ultimately completing baccalaureate degrees in STEM fields at 4-year institutions. Many programs using multiple interventions have been designed, implemented, and studied to achieve this goal. To synthesize what has been learned from studies of these programs, this article presents a systematic review of published studies of programs designed to support Latinx student success in 2-year institutions and successful transfer to 4-year institutions, particularly for STEM majors. A total of 49 quantitative, 9 qualitative, and 16 mixed-methods studies published as reports, articles, or dissertations since 1980 were identified that met the criteria for the review. Studies covered a wide range of interventions, including mentoring, counseling, advising, study groups, tutoring, scholarships, orientations, career services, undergraduate research, articulation agreements, and transfer programs. Individually, these studies report positive influences on student success outcomes, including 2- and 4-year graduation, transfer to a 4-year institution, retention, and success in individual courses. However, the number of qualifying studies was surprisingly small, considering the importance of improving success of Latinx students and the length of time during which the problem has been repeatedly emphasized. Few interventions have been undertaken from explicitly assets-based perspectives or theoretical frameworks. The lack of explicit frameworks underlying interventions—combined with a sole/primary focus on students—suggests many interventions were approached from a deficit-based perspective. Further, the study found no pattern of replication studies that might confirm effectiveness of potentially promising interventions. Based on our analysis of evaluations presented in the studies, it does not appear that the research community has developed agreed-upon methods to evaluate commonly agreed-upon outcomes. Finally, no intervention has been sufficiently supported that widespread implementation could be recommended.