共查询到20条相似文献，搜索用时 156 毫秒
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《中国现代教育装备》2002,(4)
一、MPT光谱仪的诞生 MPT光谱仪,是以吉林大学首创的微波等离子体炬(即MPT)为激发光源,经多年艰辛努力而研制成功的一种原子发射光谱分析用的新仪器。 半个多世纪以来,原子光谱法一直是人们进行元素成份分析的最主要手段,因该方法适用元素和浓度范围广,又可同时作多元素测定,因此在元素成份的定性和定量分析中处于重要地位。特别是在具有优良原子化和激发性能的电感耦合高频等离子体(即ICP)光源出现之后,ICP光谱仪又成了原子发射光谱分析仪器的主导产品。 ICP光谱法尽管有许多优点,但也存在着突出缺 相似文献
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多波段光源是一种新型光源,适用于犯罪现场勘查、痕迹检验、刑事照相和文件检验等刑事技术领域,是刑侦、物证鉴定等部门的必备器材.本文详细阐述了多波段光源的原理和用途,介绍了多波段光源在手印显现领域的应用情况,笔者试图从多波段光源原理,性能及其在手印痕迹检验中的应用等方面作一个系统的阐述,以适应当前刑事技术痕迹检验工作的发展需要. 相似文献
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元素形态分析已成为原子吸收光谱法发展的一个热点,是分析化学的一个重要发展领域。文章评述了近年来原子吸收光谱法在砷元素形态分析方面的应用进展,包括化学法分析砷元素形态、氢化物发生法分析砷元素形态和色谱一原子吸收光谱联用分析砷元素形态。 相似文献
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采用高效液相色谱(HPLC)和电感耦合等离子体质谱(ICP﹣MS)联用技术建立了香菇中镉结合蛋白的分析方法。采用SE﹣HPLC提取纯化样品,HPLC﹣ICP﹣MS测定香菇中镉结合蛋白,实验结果表明这一方法准确性好、精密度高,样品前处理方法简便,适用于香菇中镉结合蛋白的测定。 相似文献
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《昭通师范高等专科学校学报》2019,(5):27-32
对电感耦合等离子体-原子发射光谱法(ICP-AES)测定土壤中几种无机元素的应用进行了综述。该方法具有检测速度快、检出限低、准确度和灵敏度高、多元素同时测定等特点,在土壤监测以及生物技术和食品等领域具有潜在的应用。 相似文献
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高效液相色谱-质谱联用技术是一门新技术,它具有高分离能力、高灵敏度、应用范围广和极强的专属性等特点。高效液相色谱-质谱联用技术在药物分析、食品分析和环境分析等方面已有广泛的应用。该文仅对近年来高效液相色谱-质谱联用技术在中草药黄酮类化学成分分析方面的应用进行了综述。 相似文献
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常青 《泰州职业技术学院学报》2011,11(5):74-75
应用分光光度法和ICP光谱法两种仪器分析方法,对高纯盐酸中的铁含量进行了比对分析,并对可能的误差来源作了阐述。阐述了ICP光谱法比较于分光光度法较好的准确性和精确度。 相似文献
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电感耦合等离子体发射光谱仪为生产、科研提供测试服务,同时可开展实验教学。不但可以充分利用现代分析仪器使学生得到最基本的训练,培养其独立的操作能力;而且为培养创新人才提供更高、更广的教学平台,有利于开发新的实验项目,提高教学水平,加强本科生的培养。 相似文献
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研究了隐互补问题的更一般形式,即广义隐互补问题.将逐点逼近法应用到广义隐互补问题中,研究了在伪单调的条件下算法的收敛性,并证明了算法具有R-线性收敛性. 相似文献
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皮静萍 《湖南第一师范学报》2007,7(2):128-129,144
人类信息源的发展包括了点信息源、符号信息源、多媒体信息源、虚拟现实信息源等阶段。人类信息源的改变对情报学发展的影响经历了以下几个阶段:点信息源阶段与情报学的孕育期,符号信息源阶段与情报学的探索期,多媒体信息源与情报学的徘徊期,虚拟现实信息源与情报学的全面发展期。 相似文献
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Thomas F. Weiss Giancarlo Trevisan Elana B. Doering Devang M. Shah David Huang Scott I. Berkenblit 《Journal of Science Education and Technology》1992,1(4):259-274
We describe a software library that we have developed to teach biophysics and physiology to undergraduate engineering and science students as well as to medical students. The library, which is under development, now includes software on: (1) the Hodgkin-Huxley model for excitation of action potentials in electrically excitable cells (such as nerve and muscle cells); (2) a random-walk model of diffusion; (3) single voltage-gated ion channels; (4) steady-state chemically mediated transport; and (5) macroscopic diffusion processes. The software is used in a variety of ways: as an integral part of lectures, as the basis of special sessions held in electronic classrooms, as a source of homework assignments, and for special projects defined by the students. We describe the software and some of the pedagogic methods we have used. 相似文献
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毛细管电泳分析方法及其应用 总被引：1，自引：0，他引：1
张韶虹 《襄樊职业技术学院学报》2004,3(5):26-28
毛细管电泳以其自身的优点，在生命科学、医药学领域方面发挥着重要作用。介绍了毛细管电泳的分离模式，并综述了毛细管电在生命科学、医药学分析方面的应用。 相似文献
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Konstantinos B. Baltzis 《Education and Information Technologies》2010,15(1):19-36
Finite Element Method Magnetics (FEMM) is an open source finite element analysis software package for solving electromagnetic
problems. The program addresses 2D planar and 3D axisymmetric linear and nonlinear harmonic low frequency magnetic and magnetostatic
problems and linear electrostatic problems. It is a simple, accurate, and low computational cost freeware product, popular
in science and engineering. However its educational value has been underestimated. Use of the package in education is quite
rare. The aim of this paper is to explore the capability of FEMM to meet as a complementary tool the needs of teaching electromagnetics
in higher education. In order to demonstrate its use and exhibit the aid it offers in the teaching of electromagnetics illustrative
examples are given. Evaluations in both qualitative and quantitative data have also been conducted and presented. Useful conclusions
about its usage and potential applications in the teaching of electromagnetics in higher education are finally drawn. 相似文献
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Pradeep Maxwell Dass 《International Journal of Science Education》2013,35(9):969-984
The Iowa Chautauqua Programme (ICP) was disseminated through the National Diffusion Network (NDN) of the US Department of Education as an exemplary model of professional development for inservice science teachers. As a result, several new professional development programmes, emulating the Iowa Chautauqua model, were initiated in diverse settings across the USA. Adhering closely to the principal features of the ICP, the Collier Chautauqua Programme (CCP) was developed in Collier County, Florida. Teacher concerns associated with classroom implementation of instructional innovations promoted by the programme were studied qualitatively during the first year of programme implementation. Data were collected through individual and focus group interviews, workshop and classroom observations, and pre-formatted teacher journals. These data were analysed using the stages of concern (SoC) of the concerns based adoption model (CBAM) as the conceptual framework. Results reveal intricate relationships between classroom implementation by teachers and programme implementation by the school district. 相似文献
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Sohair Sakhnini 《International Journal of Science Education》2016,38(3):521-538
The goals of this study are to map applications of nanotechnology that are recommended to be taught in high-school science and to identify the ‘need-to-know’ essential nanoscale science and technology (NST) concepts for each of the selected nanotechnology applications. A Delphi study using a community of experts was used to address these goals. Five nanotechnology applications that should be taught in high-school science were found to be important and reached a consensus by the Delphi-study experts: (1) nanomedicine, (2) nanoelectronics, (3) photovoltaic cells, (4) nanobots, and (5) self-cleaning. It was found that teaching these five nanotechnology applications should be based on all seven NST concepts, and therefore, these applications can be used as an appealing context for teaching the essential NST concepts. The different recommendations between the two communities of experts emphasize the importance of involving teachers and scientists in the process of designing a scientific curriculum. Identifying the applications of nanotechnology that should be taught in high-school science and identifying the connections between the applications and the essential NST concepts constitute an important step that supports designing a context-based nanotechnology program before it is integrated into a high-school science curriculum. 相似文献
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Päivi H. Taskinen Kerstin Schütte Manfred Prenzel 《Educational Research and Evaluation》2013,19(8):717-733
Many researchers consider a lacking interest in science and the students' belief that science is too demanding as major reasons why young people do not strive for science-related careers. In this article, we first delineated a theoretical framework to investigate the importance of interest, self-concept, and school factors regarding students' career preferences. Then, we tested the expected effects on a sample of German 9th-grade students (N = 7,813). We focused on two school factors: the amount of (additional) science activities and the real-life applications in science classes. The multi-level analysis showed that school factors were highly relevant for the students' interest in science and science self-concept. In turn, interest in science and science self-concept affect the students' interest in science-related careers. We conclude that focusing on the link between individual and school characteristics is important for the understanding of students' interest in science-related careers. 相似文献