从硫化铜矿制取硫酸铜工艺研究   总被引：1，自引：0，他引：1  

李入林  赵龙涛  石昌 《南阳师范学院学报》2002,1(2):72-74

硫化铜经粉碎，催化焙烧，浸取，铁屑置换制海绵铜，再制取符合GB473－93优等品的硫酸铜产品。  相似文献   

体现素质要求注重能力考查--评2000年上海市高考物理试卷     

常生龙 《物理教学探讨》2001,19(1):13-14

教育部在<普通高校招生制度改革方案>中提出了"三个有助于"和"四个方面"的总体改革方案.对于高考内容的改革,"总体上将更加注重对考生能力和素质的考查,命题范围遵循中学教学大纲,但不拘泥于教学大纲,试题设计增加应用性和能力型题目,命题要把以知识立意转变为以能力立意,在考查学科能力的同时,注重考查跨学科的综合能力."2000年上海高考物理试卷的命题,充分体现了高考内容改革总的指导思想.  相似文献   

21世纪中国的数学教学     

綦春霞 《教育学报》2002,(9):42-45

本文探索了新世纪数学教学的目标、内容、组织形式和评价等方面的新趋势  相似文献   

原癌基因与脊椎动物精子发生     

杨纯  张育辉 《陕西理工学院学报(社会科学版)》2003,21(3):90-94

综述了近年来原癌基因c-fos、c-jun、c-myc、c-mos、c-abl、c-kit、c-raf等在精子发生过程中不同时期表达及其作用的研究进展。c-fos、c-jun、c-myc在整个生精周期中均有表达，而c-mos、c-abl主要在成熟精子中有表达。同一种原癌基因在不同种动物生精周期的相同阶段表达也不尽相同。原癌基因调控精子发生的分子机制有待深入研究。  相似文献   

Consensus among stakeholders about success factors and indicators for quality of online and blended learning in adult education: a Delphi study     

Yves Blieck  Ilse Ooghe  Chang Zhu  Koen Depryck  Katrien Struyven  Bram Pynoo 《Studies in Continuing Education》2019,41(1):36-60

Quality models for online and blended learning (OBL) have mainly been developed in higher education. The literature indicates that these models are often conceptualised from the providers’ perspective. What is important for the quality of OBL from the students’ perspective has recently received increased attention in the literature. Consensus among stakeholders about students’ quality needs is useful to support dialogue between professionals to strategically adopt OBL and to ensure that the needs of students are met. This study aims to validate a quality instrument for OBL, taking a set of 74 quality indicators and analysing them in terms of seven success factors (credibility, accessibility, transparency, flexibility, interactivity, personalisation, productivity). The Delphi method was selected as most suited. Participants from adult education were asked to indicate on a 7-point Likert scale to what extent the indicators add to OBL quality to meet students’ needs. After four Delphi rounds, the participants agreed on definitions of success factors and 30 indicators. The results are useful for institutions, ministries of education and external quality assessment agencies to assess the quality of OBL and can support institutions to implement improvement actions to ensure that the needs of students are met.  相似文献   

Assessment,Grade Level and Learning     

Agnes Chang Shook Cheong 《Asia Pacific Journal of Education》1992,12(2):35-47

Researchers have identified assessment as a very crucial influence on the learning strategies adopted by students. The present study carried out on Secondary 2, Secondary 4, and Junior College 2/Pre-University 3 students shows that the Singapore students did not favour the Surface Approach in their learning of English and Mathematics. The nature of the discipline and the cognitive demands of the examinations carried considerable importance for students in their choice of learning strategies. Despite the heavy emphasis on excelling in examinations, students did not rely solely on surface and achieving strategies to attain their goals.  相似文献   

邓小平对毛泽东对外战略思想的继承和发展     

刘春蕊 《青岛职业技术学院学报》2001,14(4):1-4

邓小平的对外战略理论是邓小平理论的重要组成部分。它不仅在新的国际形势下继承和发展了毛泽东的外交战略思想 ,而且为建设有中国特色社会主义的理论和实践提供了一个重要的依据。它从一个侧面反映了邓小平理论和毛泽东思想是一脉相承的 ;同时 ,又是在新的历史条件下对毛泽东思想的丰富和发展  相似文献   

草苁蓉花序多糖BJⅡa的分离提纯与结构研究     

常桂英  孙仓  矫艳春 《通化师范学院学报》1997,(7)

利用溶剂提取与DEAE—Sephadex A—25柱层析进行分离,根据高碘酸氧化、Smith降解,部分酸水解、甲基化及其产物的G.C.和G.C.—M.S.联机分析鉴定其结构.得出BJⅡa是多分枝结构的中性杂多糖,其主链是由1→2连接的葡萄糖和岩藻糖构成。  相似文献   

无机多组份体系同时测定分光光度法     

奚长生 《湖南城市学院学报》1993,(5)

自1951年B、chance研制成第一台双波长分光光度计以来,无机多组份体系分光光度测定方法,取得了显著的进展,发展了双波长分光光度法,三波长分光光度法,双显色双波长分光光度法,导数分光光度法,组合导数分光光度法,本文试就借助于仪器的输出信息,消除重叠光谱带的干扰,同时测定无机多组份体系的分光光度方法,作一简要的评述。  相似文献   

城市社区体育组织结构"小型化"探索     

杨丽红  丁长海 《泉州师范学院学报》2003,21(2):115-118

为适应城市居民生活“小区”化和以建设“明小区”为重点的社会工作路线，改变目前社区体育组织以“街道”为单一层次的基本结构，本课题采用献法、调查法、比较及逻辑法等，对“小型化”社区体育组织的现状、目标及发展模式进行了深入研究，并提出了辐射型、网络型、独立型三种递进式组织结构模式，为社区体育组织结构的转型发展提供参考依据。  相似文献