Visualization of structured packing with laser induced fluorescence technique: Two-dimensional measurement of liquid concentration distribution

A method of using laser induced fluorescence(LIF)technique was applied to two-dimensional measurement of the liquid concentration distribution in the 250Y structured packing sheet. The experimental structured packing sheet was made of perspex so that the laser could pass through it. The visualization of the distribution of the liquid concentration in the structured packing sheet was realized. The calibration of the thickness and liquid concentration was carried out firstly and the regression formula I=kcd was acquired, in which concentration c and the liquid film thickness d were both considered. Then the liquid feed of uniform tracer(rhodamine)concentration entered the perspex structured packing from the top under different spraying densities. The corresponding thickness of liquid film on the packing was calculated. Finally, tracer(rhodamine)with a high concentration was injected only at one fixed point of the structured packing under different spraying densities of the liquid. With the known liquid film thickness, the concentration distribution of the tracer can be calculated inside the structured packing sheet.     

许昌市数字农业信息服务平台构建

基于地理信息系统的功能和特点,结合数据库技术和WEBGIS技术,提出了构建数字农业信息服务平台构建的原则,分析了数据库设计、功能设计等关键技术,并初步构建了许昌市数字农业信息服务平台.     

学部咨询在国家科技发展中的重大作用

中国科学院学部成立于1955年6月1日,现设数学物理学部、化学部、生命科学和医学部、地学部、信息技术科学部和技术科学部等六个学部。1984年,国务院明确规定学部是“国家在科学技术方面的最高咨询机构”,院士是“国家在科学技术方面的最高荣誉称号”。50多年来,学部始终把为国家建设服务,为社会做贡献作为自己的历史使命,咨询评议工作已逐渐成为学部的主要职能。中国科学院学部的咨询评议工作主要针对国家经济建设、社会发展和国家安全中的重大科学技术问题,同时面向国民经济主战场,接受部门、行业、地方以及国家重要学术机构有关重大科学技…     

情报学进展系列论文之一情报学的形成和定位

文章在分析大量的国外权威文献的基础上,结合国内研究成果,回答情报学形成和发展的动力、情报学定义所包含的要素、情报学的结构、情报学的目标和定位问题.     

基于中国引文数据库的核心书目测定研究

介绍了法律类、计算机类、哲学类3个核心书目测定的方法,针对上述核心书目测定中入选标准随意、所占比例差距过大和总量过高的问题,基于帕累托原则和引文分析法,利用中国知网的中国引文数据库自1979年以来的引文数据进行统计,综合考虑引文时滞问题,构建食品工业类核心书目。     

计算机信息安全及对策

主要介绍有关计算机网络信息安全的基础知识、计算机信息系统所面临的威胁,并提出和具体阐述针对这些问题的对策。     

The Influence of CASE on Scientific Creativity

This paper describes a study of the influence of the Cognitive Acceleration through Science Education (CASE) programme on the scientific creativity of secondary school students. 1087 pupils from six suburban mixed comprehensive schools in England took part in the investigation. Three of the schools had participated in the CASE programme and three had not. Samples of students in years 7–11 from each school were given the Scientific Creativity Test for Secondary School Students, an instrument designed to tap various aspects of scientific creativity. The results indicated that the CASE programme did promote the overall development of scientific creativity of secondary school students, although the effects on different aspects of scientific creativity varied. As expected from previous work on delayed effects of CASE on academic achievement, the results indicated that the effects on creativity were not necessarily immediate, but tended to be long-lasting. Possible interpretations of these results are discussed.     

促进学生课堂生成的教学策略

课堂生成是新课程背景下,课堂教学的价值追求。生成是学生在已有知识、经验的基础上,经过加工整合进而产生新的思维产品的过程,是学生智慧火花的闪现,是我们教学中所需要追求的。一、课堂的生成特性在生成性的课堂中,教学不是完全根据教师的事先预设按部就班地进行,而是充分发挥师生双方的积极性,随着教学活动的展开,教师、学生的思想和教学文本不断碰撞,创造火花不断迸发,新的学习需求、方向不断产生,学生在这个过程中兴趣盎然,认识和体验不断加深。“生成”的课堂是无法预期的,课堂教学中的一些“意外”会被教师当作宝藏去发掘,尽量开采出…     

思想政治教育在少数民族学生教育中的价值

思想政治教育在少数民族学生教育中具有十分重要的战略地位,发挥着重要作用,具有重要价值。要高度重视思想政治教育的在少数民族学生教育中的价值,在少数民主学生教育中始终不渝地重视和加强思想政治教育,才能发挥思想政治教育在少数民族学生教育的重要作用。     

羽毛球选项课运用比赛法教学的实验研究

在羽毛球选项课教学中运用比赛法进行教学，加强了学生的直觉观感，使其更好地理解和掌握了动作要领，达到了增强学习兴趣及课堂教学效果的目的。