微柱法测定糖化血红蛋白方法的改进     

李彪英  候丽娟  常晓彤  麻秀丽 《河北北方学院学报(医学版)》2002,19(1):11-12

目的 :建立一种在临床上比较实用的GHb的测定方法。方法 :将Bio -Rex70阳离子交换树脂溶液与溶血液充分振荡、混匀后 ,离心 ,测定上清液的吸光度值。结果 :变异系数 :,正常标本CV % =3、3% ;高值标本CV % =4、5 %。方法比较 ,与泰康公司微柱法试剂盒比较r=0 .94 ,密切相关。灵敏度 ,0 .0 1A相当于GHb为 0 .3%。结论 :经改进的微柱法 ,简便、快速 ,性能符合临床要求  相似文献   

灯盏花的研究进展     

张举成任驰  肖兰英 《蒙自师范高等专科学校学报》2005,3(6):27-29

综述了近几十年来有关灯盏花的化学成分、药理作用、配伍及化学成分的构效关系研究工作．  相似文献   

清代北方边疆建置研究——以蒙古地区扎萨克制度为中心     

彭瑞轩  费驰 《内蒙古大学学报(人文社会科学版)》2016,(4):26-30

当前民族大融合的建置体系,得益于清朝在边疆地区设置的具有民族特色的建置,包括蒙古地区的扎萨克制度。清政府通过扎萨克制度将蒙古各部分为内扎萨克蒙古及外扎萨克蒙古等。扎萨克制度的实行,使清政府加强了对蒙古各部的有效统治,迎合了清政府加强中央集权的需要,使蒙古各部成为抵御沙俄入侵的屏障,维护了清朝北方边疆的安全。  相似文献   

Winning the battle and losing the war: Examining the relation between grade retention and dropping out of high school     

Shane R. Jimerson  Gabrielle E. Anderson  Angela D. Whipple 《Psychology in the schools》2002,39(4):441-457

The aim of this investigation is to provide a comprehensive review of dropout research that examines grade retention within both associative and predictive models. A systematic review of seventeen studies examining dropping out of high school prior to graduation demonstrates that grade retention is one of the most powerful predictors of dropout status. The discussion addresses the discrepancies among the perspectives of many educational professionals regarding the effectiveness of grade retention and deleterious long‐term correlates. The transactional model of development is presented, which emphasizes developmental trajectories over time, in order to facilitate the interpretation of the association between grade retention and school withdrawal. Educational professionals, teachers, researchers, parents, and policymakers considering the efficacy of grade retention are encouraged to consider the implications of these findings. © 2002 Wiley Periodicals, Inc.  相似文献   

Student Perceptions of Chemistry Laboratory Learning Environments, Student–Teacher Interactions and Attitudes in Secondary School Gifted Education Classes in Singapore     

Quek Choon Lang  Angela F. L. Wong  Barry J. Fraser 《Research in Science Education》2005,35(2-3):299-321

This study investigated the chemistry laboratory classroom environment, teacher–student interactions and student attitudes towards chemistry among 497 gifted and non-gifted secondary-school students in Singapore. The data were collected using the 35-item Chemistry Laboratory Environment Inventory (CLEI), the 48-item Questionnaire on Teacher Interaction (QTI) and the 30-item Questionnaire on Chemistry-Related Attitudes (QOCRA). Results supported the validity and reliability of the CLEI and QTI for this sample. Stream (gifted versus non-gifted) and gender differences were found in actual and preferred chemistry laboratory classroom environments and teacher–student interactions. Some statistically significant associations of modest magnitude were found between students' attitudes towards chemistry and both the laboratory classroom environment and the interpersonal behaviour of chemistry teachers. Suggestions for improving chemistry laboratory classroom environments and the teacher–student interactions for gifted students are provided.  相似文献   

关于国家竞争情报研究的历史梳理     

侯经川 《情报理论与实践》2006,29(5):516-519

国家竞争情报研究是情报学未来应该大力发展的领域。本文对历史上的国家竞争情报研究活动作了一个简单的梳理，以期引起学界对国家竞争情报研究的关注，使之成为情报学新的学科生长点。  相似文献   

基于角色的虚拟研发团队构建方法及其约束机理研究   总被引：1，自引：0，他引：1  

刘建昌  侯光明  王俊鹏 《科学学与科学技术管理》2005,26(4):123-128

提出了角色依赖图的概念，并在此基础上给出了基于角色的虚拟研发团队构建方法。以此为基础，结合周界理论，分析了影响虚拟研发团队开放度和交换率的主要因素，揭示了虚拟研发团队的内在约束机理。  相似文献   

科技情报工作需要尽快摆脱"非常态"   总被引：1，自引：1，他引：1  

池建文  顾小放 《情报理论与实践》2007,30(6):721-724

本文从系统分析的角度,认为我国科技情报工作自20世纪80年代末以来进入"非常态"。当前国防科技情报工作虽有好转,但尚没有完全摆脱这种状态。文章剖析了导致科技情报工作"失常"的3个主要原因,指出情报观念的异化是当前的主导原因,并据此提出使科技情报工作摆脱"非常态"的3个切入点,即在理论和实践上科学界定和准确把握科技情报及其功能定位、科技情报机构职能定位、科技情报系统及工作价值定位3个问题。  相似文献   

基于RITE测度的降维方法研究     

侯三军  郑建明  陈雅 《情报理论与实践》2007,30(5):609-612

在RITE的框架下,考察了社会信息化指标体系中不同指标的增长特征及其在测算中的表现,提出了一种基于RITE测度的降维方法——指标增长特征降维法的实现思路。文章结合案例,通过指标抽取试验,对所提出的方法进行了实证研究。  相似文献   

Some results on the Induced Matching Partition Number of Product Graphs     

Yalin Hou 《科教文汇》2007,(21)

The induced matching partition number of graph G is the minimum integer k such that there exists a k-partition (V1,V2,…Vk) of V(G) such that,for each i(1≤i≤k),G[Vi]is 1-regular.In this paper,we study the induced matching partition number of product graphs. We provide a lower bound and an upper bound for the induced matching partition number of product graphs, and exact results are given for some special product graphs.  相似文献