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排序方式: 共有180条查询结果,搜索用时 15 毫秒
21.
本文以"医疗电子影像诊断仪"实训平台的研制为主题,描述了该实训平台的整体构成,剖析了主要电路模块的功能,重点阐述了实训平台中各测试点及模拟故障点设置的基本理念,介绍了该平台能实现的实训项目。该平台可为医疗电子类人才的培养提供一种实用、有效的实训教学手段。 相似文献
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本文主要讨论了虚拟仪器技术在声纳装备PCB测试、维修中的应用,阐述了虚拟仪器的基本原理与特点,给出声纳装备PCB测试系统的硬件框架和软件程序。 相似文献
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Parental anxiety in children’s education is closely related to children’s developmental and educational outcomes. The current study reported the development and validation of a self-report instrument to evaluate the Sources of Parental Anxiety in Children’s Education (SPACEs). Qualitative analyses suggested that the construct of parental anxiety in children’s education was multidimensional, representing learning performance anxiety, educational environment anxiety, educational input anxiety, and educational outcome anxiety as four primary sources. The results from exploratory and confirmatory factor analyses supported this four-factor structure comprising 17 items to capture this multidimensional construct. The scale also demonstrated adequate internal consistencies, convergent validity, discriminant validity, criterion-related validity, and test-retest reliability. A series of multi-group tests across age, locality, and children’s grades provided evidence of measurement invariance. Overall, the SPACE scale appear to be a reliable and valid tool to measure educational anxiety in parents in the Chinese context. 相似文献
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Xenia PapadomichelakiAuthor Vitae Gregoris MentzasAuthor Vitae 《Government Information Quarterly》2012,29(1):98-109
A critical element in the evolution of governmental services through the internet is the development of sites that better serve the citizens' needs. To deliver superior service quality, we must first understand how citizens perceive and evaluate online. Citizen assessment is built on defining quality, identifying underlying dimensions, and conceptualizing measurements of these e-government services. In this article an e-gov service quality model (e-GovQual) is conceptualized and then a multiple-item scale for measuring e-gov service quality of governmental sites where citizens seek either information or service, is developed, refined, validated confirmed and tested. 相似文献
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本文主要探讨了"问题式"教学模式在成人教育仪器分析教学中的实施和措施,以期在仪器分析教学改革中有新的启示。 相似文献
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Evaluating Instrument Quality in Science Education: Rasch‐based analyses of a Nature of Science test
Irene Neumann Knut Neumann Ross Nehm 《International Journal of Science Education》2013,35(10):1373-1405
Given the central importance of the Nature of Science (NOS) and Scientific Inquiry (SI) in national and international science standards and science learning, empirical support for the theoretical delineation of these constructs is of considerable significance. Furthermore, tests of the effects of varying magnitudes of NOS knowledge on domain‐specific science understanding and belief require the application of instruments validated in accordance with AERA, APA, and NCME assessment standards. Our study explores three interrelated aspects of a recently developed NOS instrument: (1) validity and reliability; (2) instrument dimensionality; and (3) item scales, properties, and qualities within the context of Classical Test Theory and Item Response Theory (Rasch modeling). A construct analysis revealed that the instrument did not match published operationalizations of NOS concepts. Rasch analysis of the original instrument—as well as a reduced item set—indicated that a two‐dimensional Rasch model fit significantly better than a one‐dimensional model in both cases. Thus, our study revealed that NOS and SI are supported as two separate dimensions, corroborating theoretical distinctions in the literature. To identify items with unacceptable fit values, item quality analyses were used. A Wright Map revealed that few items sufficiently distinguished high performers in the sample and excessive numbers of items were present at the low end of the performance scale. Overall, our study outlines an approach for how Rasch modeling may be used to evaluate and improve Likert‐type instruments in science education. 相似文献
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