共查询到20条相似文献，搜索用时 156 毫秒
1.
介绍了阵列型LED器件电参数测试仪的测试原理和控制方法,基于高性能混合信号单片机C8051F060,提出了该测试仪的系统设计方案.对测试仪硬件系统的总体结构以及正向导通电压测试电路、反向漏电流测试电路、测试回路和阵列选择电路等主要功能模块的硬件实现作了具体阐述和分析. 相似文献
2.
介绍太阳电池的物理原理,表征太阳电池特性的物理参数,阐述了大学物理实验中的太阳电池特性测试仪的结构原理及其实验内容和测试的方法、测试内容,并对实验进行分析总结. 相似文献
3.
分别利用太赫兹时域光谱系统（THz-TDS）和傅里叶变换红外光谱仪（FTIR）,对由钻孔取芯机所取岩芯上选取的6个不同深度样品进行了测试。结果表明：随着样品深度的增加,在太赫兹波段,吸收系数和透射系数变化不明显,但折射率则逐渐降低;在红外波段,样品所含盐类逐渐减少,而CaCO3和SiO2的含量则逐渐增大,说明盐类物质是由外部环境污染而来,内部岩石则尚未被污染。 相似文献
4.
裴咏之 《连云港职业技术学院学报》1996,(4)
本文介绍了粗纱机锭翼参数的微机测试仪的硬件结构原理和软件设计。本
测试系统具有很高的可靠性和实用性，是一种可行的锭翼生产的测试、检验手段。 相似文献
5.
6.
粗纱机锭翼扩张量及转速的微机测试 总被引：3，自引：0，他引：3
裴咏之 《连云港职业大学学报》1996,9(4):45-46
本介绍了粗纱机锭翼参数的微机测试仪的硬件结构原理和软件设计。本测试系统具有很高的可靠性和实用性，是一种可行的锭翼生产的测试、检验手段。 相似文献
7.
8.
曾强 《实验室研究与探索》2012,31(7):15-18
采用物理吸附原理将一定体积湿空气中的水分析出,通过测量、称重、计算出干气体体积和水分的摩尔量,得到湿空气的含湿量,进而成功研制了湿空气含湿量测试仪。研发的测试仪适用于温度高于160℃,湿空气水分含量高于30%的测试加工介质条件。采用热湿处理在线分析仪对仪器性能进行了分析检测,并在干燥生产线上进行了生产验证。结果表明:加工介质温度和湿度的提高有助于测试过程准确度和精密度。研制的含湿量测试仪具有测试简便、快速、准确性高等特点,适合于大规模生产线干燥过程湿空气含湿量的实时监测。 相似文献
9.
10.
11.
于鹏杰 《绵阳师范学院学报》2004,23(6):83-86
近年来，我国职业测验有了一定的发展，但在实践中还存在一些问题：1、缺乏真正适合中国职业测量的本土测验；2、评价工具的质量认可缺乏规范；3、使用职业测验工具的使用的素质有待提高；4、职业测验的应用力度和广度有待加强。解决这些问题，应规范测评工具，使之标准化；应根据测试性质选择测评工具，要提高测评工作人员的素质，使用引进测试工具时应注意化差异。 相似文献
12.
13.
针对传统仪器在汽车性能实验中的不足,设计了一套基于虚拟仪器技术的汽车性能实验测试系统,用于汽车性能实验的数据采集和处理。并通过实验验证了该系统的可行性和可靠性。 相似文献
14.
大循环模式下实验仪器设备的科学管理与维护 总被引：1，自引：0，他引：1
大循环实验模式可以充分利用实验设备,提高仪器的利用率,实行这种模式必须有相应科学的实验仪器设备管理方法。在教学实践中通过归纳总结,找出仪器设备的共性特征和个性特征,采取相应的维修和护养措施,做到了仪器设备的维护管理与实验教学相统一。使设备管理和维护工作实验课教学的要求相适应,从而达到了充分利用实验设备,节约开支,提高学生动手能力,提高实验课质量的目的。 相似文献
15.
Mohamed A. Shahat Annika Ohle David F. Treagust Hans E. Fischer 《International Journal of Science and Mathematics Education》2013,11(5):1157-1181
Educators and policymakers envision the future of education in Egypt as enabling learners to acquire scientific inquiry and problem-solving skills. In this article, we describe the validation of a model for problem solving and the design of instruments for evaluating new teaching methods in Egyptian science classes. The instruments were based on an established model for problem solving and were designed to assess seventh grade students’ problem solving, experimental strategy knowledge, achievement and motivation towards science. The test for assessing students’ knowledge has been developed based on the topic, density and buoyancy which will be taught in seventh grade in a later intervention study. The instruments were partly self-developed and partly adapted from newly performed studies on strategy knowledge and problem solving in Germany. All instruments were translated into Arabic; the translation process and quality control are described. In order to determine the quality of the instruments, 44 students in Egypt completed the questionnaires and tests. The study’s aim to develop and validate the instruments did require an ad hoc and typical sample which was drawn from an accessible population. Accordingly, the characteristics of the sample are described. Data were analysed according to the classical test theory, but to underpin the results, the instruments were additionally analysed using the even stronger Rasch model. The findings demonstrated the reliability of the items and aspects of validity. In addition, this study showed how test items can be successfully developed and adapted in an international study and applied in a different language. 相似文献
16.
Anne Arnesen Johan Braeken Terje Ogden Monica Melby-Lervåg 《Scandinavian Journal of Educational Research》2019,63(3):465-490
Social functioning and reading proficiency are critical for success in school and society. Therefore, identifying children with such problems is important. This study had 2 parts: first, a random sample of 234 elementary schools was surveyed about which instruments they use to assess reading proficiency and social functioning. Second, a systematic review of the quality of these instruments was conducted using international standards for examining the quality of assessment instruments. The survey showed that schools more often assessed and had more instruments available for reading than for social functioning. The systematic review of the assessment instruments used revealed that the psychometric qualities of many was weak or undocumented, while the dimensions of test material quality were generally good. The findings demonstrate a need for a more thorough examination of the psychometric properties of assessment instruments to be used in school. 相似文献
17.
18.
Field dependence–independence (FDI) has long been conceptualized and discussed as a cognitive style relevant to numerous educational
approaches and outcomes. However, the FDI construct is most often measured as a cognitive ability, as opposed to a style,
using instruments such as the Group-Embedded Figures test (GEFT) or the Hidden Figures Test (HFT). Specifically, FDI is typically
measured as visuospatial ability and executive functioning in working memory. While measurement and use of FDI within psychological
and educational research has often resulted in misleading or inconsistent discussion about cognitive styles, this review examines
how the long history of FDI research continues to be relevant to contemporary instructional contexts. A broader recognition
of FDI as ability is suggested in order to (a) better distinguish ability measurements from those of styles, (b) encourage
a reinterpretation and awareness of theoretical connections among past studies that use instruments such as GEFT or HFT, and
(c) highlight suggestions for future research and application, particularly with contemporary interactive multimedia learning
tools. 相似文献
19.
票据无因性是承载现代票据制度的基础,是票据法的生命力所在。但是在认识到票据无因性重要性的同时,也要看到票据无因性并非是绝对的,也有其效力所不及的周延范围。因此,在票据法律制度中形成票据行为无因性规则的相对化理论,显得非常有现实意义。 相似文献
20.
In more recent times, health-related quality of life (HRQOL) measurements have formed an important part of assessing the quality
of routine care in general practice. For a measure to have clinical usefulness it must not only be valid, appropriate, reliable,
responsive, and capable of being interpreted, but it must also be simple, fast to complete, easy to score, and provide useful
clinical data. The Two-step method of choosing appropriate measures is introduced. Then through comparison of generic instruments
with disease-specific instruments, we can conclude that sometimes a combination of generic and disease-specific HRQOL measures
may be more appropriate for monitoring changes in a patient's health status due to an intervention. 相似文献