单摆测重力加速度的比较研究     

刘建伟  翟潞  李婧 《长治学院学报》2014,(5)

用单摆测重力加速是中学物理较重要的实验,本文应用传统方法、计时器、传感器三种测量方式对重力加速度进行测量。三种测量方法均在误差范围内,结果发现利用传感器测量结果误差最小。  相似文献   

A prospective,randomized crossover study comparing direct inspection by light microscopy versus projected images for teaching of hematopathology to medical students          下载免费PDF全文

Aaron M. Carlson  Ellen D. McPhail  Vilmarie Rodriguez  Georgene Schroeder  Alexandra P. Wolanskyj 《Anatomical sciences education》2014,7(2):130-134

Instruction in hematopathology at Mayo Medical School has evolved from instructor‐guided direct inspection under the light microscope (laboratory method), to photomicrographs of glass slides with classroom projection (projection method). These methods have not been compared directly to date. Forty‐one second‐year medical students participated in this pilot study, a prospective, randomized, crossover study measuring educational performance during a hematology pathophysiology course. The students were randomized to one of two groups. All students received the same didactic lectures in the classroom and subsequent case‐based review of peripheral blood smears using either laboratory or projection methods, on day one with a crossover to the other method on day two. Pre‐ and post‐test examinations centered on morphology recognition measured educational performance on each day, followed by a questionnaire identifying the student's favored method. There was no significant difference in the pre‐test and post‐test scores between the two teaching methods (rank‐sum P = 0.43). Students overwhelmingly preferred the projection method and perceived it as superior (76%), although post‐test scores were not significantly different. Student's recommended method was split with 50% favoring the projection method, 43% favoring a combined approach, and 23% noting logistical challenges to the laboratory. In this study, the laboratory and projection method were equivalent in terms of educational performance for hematopathology among medicals students. A classroom‐based approach such as the projection method is favored, given the large class sizes in undergraduate medical education, as well as the ergonomic challenges and additional resources required for large group instruction in a laboratory setting. Anat Sci Educ 7: 130–134. © 2013 American Association of Anatomists.  相似文献   

一种测试不同温度下非饱和土土-水特征曲线的试验装置   总被引：2，自引：0，他引：2  

Guo-qing CAI  Cheng-gang ZHAO  Jian LI  Yan LIU 《浙江大学学报(A卷英文版)》2014,15(5):364-373

研究目的：研制一种试验装置,以实现对非饱和土土-水特征曲线温度效应的有效测试。创新要点：1．研制了一种温控非饱和土三轴试验装置,包括加载系统、吸力控制系统和温度控制系统;2．利用研制的温控非饱和土三轴试验装置,对不同温度（25,40和60℃）以及不同应力（40100和200kPa）条件下的非饱和土土-水特征曲线进行了试验测定。研究方法：1．总结分析已有的温控三轴仪所采用的加热方式的优缺点,提出环向加热压力室内水体的方法;2．基于GDS非饱和土三轴仪,研制可实现温度控制功能的温控非饱和土三轴仪（图1、2）;3．开展不同温度及不同应力条件下非饱和土土水特征曲线的试验研究。重要结论：1．所研制的温控非饱和土三轴仪的实用效果得到验证;2．温度的升高将引起非饱和土持水性能的降低。  相似文献   

反馈电路的判别方法     

邓宽林 《十堰职业技术学院学报》2003,16(2):78-79

引入受控元件输入、输出端和输入、输出回路和放大电路输入、输出端和输入、输出回路的概念，根据它们的连接规律来确定反馈的类型，既形象，又直观，而且使用起来快捷、准确。  相似文献   

后控词表研究及统计分析   总被引：7，自引：0，他引：7  

李新华 《图书馆论坛》2003,23(2):79-81

在分析了后控词表的历史、发展、原理、功能后，比较了情报检索过程中有后控词表进行检索和无后控词表进行检索的区别，最后统计分析了我国后按词表的研究现状。  相似文献   

A guide for the perplexed: Scientific educational research, methodolatry, and the gold versus platinum standards   总被引：1，自引：0，他引：1  

D.C. Phillips   《Educational Research Review》2006,1(1):15-26

The paper opens by characterizing recent discourse about empirical educational research as the “new Babel”-critics, using different theoretical vocabularies and making different deep assumptions about the nature of social life, are failing to communicate with each other. After locating some of the critical positions on a left-right continuum, the main discussion focusses upon the end of this continuum where there are located the recent attempts to restore rigor to educational research by using the so-called “gold standard” of randomized field trials. It is argued that positions at this end of the continuum misrepresent the nature of science, and some examples are briefly mentioned in order to covey the point that it is fruitful to view scientists as making convincing cases, cases that appeal to a wide variety of evidence. This assessment of scientific cases is called the “platinum standard”.  相似文献   

对流域控制性水工程建设与管理若干问题的思考     

余富基  杨谦 《长江工程职业技术学院学报》2001,18(1):48-50

首先从流域水的自然特性及流域社会经济的要求出发 ,结合国内外流域治理开发的经验教训 ,提出了只有实现流域机构建设与管理控制性水工程 ,才能保证在发挥控制性水工程社会效益的前提下 ,对流域进行综合高效治理 ,推动流域的滚动开发 ;并在对我国有关流域机构建设与管理控制性水工程的现行政策法规简要评介的基础上 ,提出了一些初步意见  相似文献   

论审判公开与人民法院审判机制改革     

王霞 《常熟理工学院学报》2007,21(3):91-95

审判公开是我国司法审判中的一项基本制度,但在审判实践中与审判公开相悖的现象仍然存在,尤其是目前的法院审判机制已成为制约审判公开落实的瓶颈。因此,必须实现审判权的归位,建立运行合理的审判工作机制。  相似文献   

半波可控整流实验电路的设计及测试     

潘柏英 《湖州师范学院学报》1994,(6)

本文论述了利用可控硅元件,设计半波可控整流实验电路的原理,并给出了实例具体说明.  相似文献   

The influence of heterogeneous exposure and pre-deliberation queries on pretrial publicity effects     

Jon Bruschke  Andrew Gonis III  Sarah A. Hill  Pam Fiber-Ostrow  William Loges 《Communication monographs》2016,83(4):521-534

Prior research on pretrial publicity has produced mixed results and a roughly equal number of studies show an effect, show no effect, or show mixed results. We explored the effects of (a) homogenous vs. heterogeneous exposure (whether deliberating jurors were all exposed to the same publicity or not) and (b) pre-deliberation queries as potential contributors to mixed results. We found an effect for positive but not negative publicity on conviction rates but not evidence ratings. Exposure heterogeneity appears to explain these differences and pre-deliberation queries did appear to play some role in the obtained outcomes. Overall these findings do not replicate a robust publicity effect and future research should consider how homogeneous exposure and pre-deliberation opinion queries influence results.  相似文献