仪器在不同误差分布下其置信系数C的计算     

鲁晓东  竺江峰  俞群娣 《牡丹江教育学院学报》2005,(5):72-72

本文介绍了仪器误差中置信系数C的计算方法及其在不确定度评定中的应用.  相似文献   

薄膜测量的椭偏仪法   总被引：1，自引：0，他引：1  

杜学东  王红 《唐山师范学院学报》2002,24(5):67-68

简述了椭偏法测量薄膜厚度的物理原理，分析了其系统误差。  相似文献   

数控加工过程监测与信号处理系统的研制     

庞静珠  李蓓智  杨建国  张华德 《上海大学学报(英文版)》2004,8(Z1)

为了使数控加工过程处于受控状态,该文构造了一种基于免疫机理的加工过程监测系统.文中重点介绍了过程监控硬件设计和在LabVIEW环境下的软件模块化设计.综合运用了包括功率谱分析在内的多种信号处理方法,通过运用生物免疫机理中的反向选择算法和遗传算法及时准确监测系统状态.试验证明,这种监测系统具有很强的灵活性和可扩展性,对主动避免和减少数控机床故障具有重要意义.  相似文献   

物理实验教学仪器分析     

蒋作宏  康士秀  霍剑青 《教育与现代化》2003,(1):40-43

本通过对1990年－2001年5所高校物理教学仪器的发展和变化情况的分析显示，教学实验仪器约有20％／5年的稳步增长，1台／人（普通仪器）和1台／2人（贵重仪器）占有率增加约为10％／5年。其中国产仪器占有绝对优势，自制仪器仍然是重要的组成部分。调查结果显示，仪器的标准化，发展开放、经典式仪器和计算机仿真技术的引入对提高教学质量有十分显的效果。  相似文献   

虚拟仪器技术在风洞测控智能化中的应用     

竹朝霞  惠增宏  金承信 《实验技术与管理》2006,23(9):76-79

概述了虚拟仪器技术在国内外风洞中的应用,针对正在建设中的我国第一座增压连续式超音速翼型风洞（NF-6风洞）,论述了采用虚拟仪器技术开发该风洞智能测控系统的实施方案.  相似文献   

REVISITING A 90-YEAR-OLD DEBATE: THE ADVANTAGES OF THE MEAN DEVIATION     

Stephen  Gorard    《British Journal of Educational Studies》2005,53(4):417-430

ABSTRACT:  This paper discusses the reliance of numerical analysis on the concept of the standard deviation, and its close relative the variance. It suggests that the original reasons why the standard deviation concept has permeated traditional statistics are no longer clearly valid, if they ever were. The absolute mean deviation, it is argued here, has many advantages over the standard deviation. It is more efficient as an estimate of a population parameter in the real-life situation where the data contain tiny errors, or do not form a completely perfect normal distribution. It is easier to use, and more tolerant of extreme values, in the majority of real-life situations where population parameters are not required. It is easier for new researchers to learn about and understand, and also closely linked to a number of arithmetic techniques already used in the sociology of education and elsewhere. We could continue to use the standard deviation instead, as we do presently, because so much of the rest of traditional statistics is based upon it (effect sizes, and the F-test, for example). However, we should weigh the convenience of this solution for some against the possibility of creating a much simpler and more widespread form of numeric analysis for many.  相似文献   

虚拟仪器技术在"电子技术实验" 远程教学中的运用     

陈列尊  谭岳衡  陈扬 《衡阳师范学院学报》2002,23(6):27-29

本文探讨了运用虚拟仪器开发多媒体CAI课件的家庭电子实验平台，以及将虚拟仪器技术与EDA、网络等技术结合开发虚拟仿真实验室，基于网络的远程实验系统，开展家庭实验，计算机模拟，仿真以及小组协作实验等电子技术远程实验教学，并给出了一些实际例子。  相似文献   

An Approach to Measuring Cognitive Outcomes Across Higher Education Institutions     

Stephen?P.?KleinEmail author  George?Kuh  Marc?Chun  Laura?Hamilton  Richard?Shavelson 《Research in higher education》2005,46(3):251-276

Over the past decade, state legislatures have experienced increasing pressure to hold higher education accountable for student learning. This pressure stems from several sources, such as increasing costs and decreasing graduation rates. To explore the feasibility of one approach to measuring student learning that emphasizes program improvement, we administered several open-ended tests to 1365 students from 14 diverse colleges. The strong correspondence between hand and computer assigned scores indicates the tests can be administered and graded cost effectively on a large scale. The scores were highly reliable, especially when the college is the unit of analysis; they were sensitive to years in college; and they correlated highly with college GPAs. We also found evidence of value added in that scores were significantly higher at some schools than at others after controlling on the schools mean SAT score. Finally, the students said the tasks were interesting and engaging.  相似文献   

虚拟仪器TTG及其在声速测量中的应用   总被引：1，自引：0，他引：1  

陈东生  熊慧萍  张素才 《实验室研究与探索》2006,25(8):931-932,998

先对虚拟仪器TTG作了一个简要的介绍,然后举例说明TTG在声速测量中的应用。  相似文献   

清代宫廷音乐的乐器编配及其历史意义   总被引：1，自引：0，他引：1  

别敏 《承德师专学报》2003,23(3):30-32

从历史发展看,清代统治集团以开放吸纳的态度对待中华各民族的音乐及乐器,从而形成了清代宫廷音乐民族融合的特点:一是乐器繁复,二是乐曲众多。这种特点说明,中华民族是一个民族融合体,只有不断吸纳新的事物才能保持先进性,中华民族具有强大的凝聚力。  相似文献