由Kuhn-Tucker条件看线性规划的对偶问题   总被引：3，自引：0，他引：3  

安中华 《培训与研究》2004,21(2):22-24

利用非线性规划的kuhn-Tucker条件给对偶线性规划一个统一简洁的定义，并给出线性规划与其对偶线性规划的变量和Kuhn-Tucker乘子的完整关系。  相似文献   

数字功率表设计与制作   总被引：1，自引：0，他引：1  

李松柏  朱娟  聂应国 《内江师范学院学报》2006,21(2):40-43

以时分割模拟乘法器为核心,采用CM O S双积分A/D转换器ICL 7107完成A/D转换和驱动LED显示,设计制作三位半数字功率表。介绍其设计,制作与实验。  相似文献   

天然气汽油两用燃料发动机的发展历程与展望     

张云  莫德赟  蔡妍 《教育教学论坛》2020,(12):106-107

随着社会的发展与进步,汽车日益普及,对汽油、柴油的消耗大幅增加,机动车尾气排放对环境及能源形势也产生了极大的影响。推进新能源、新技术的研究探索,具有十分重要的现实意义。文章对国内外在天然气/汽油两用燃料发动机方面的技术发展历程进行论述,并分析了天然气/汽油两用发动机的发展与应用趋势。  相似文献   

Reformation of VET and demands on teachers’ subject knowledge – Swedish vocational teachers’ recurrent participation in a national CPD initiative     

S. Köpsén  P. Andersson 《Journal of Education & Work》2017,30(1):69-83

This study investigates continuing professional development (CPD) of vocational teachers, with a focus on recurrent participation. Vocational teachers need to be competent as teachers and in relation to their vocational teaching subject. Reformation of Swedish vocational education in order to strengthen the working-life connection imposes demands on teachers to have up-to-date knowledge about the vocations related to their vocational subjects. To support the reform, vocational teachers have been offered to participate in a new national CPD initiative targeting their vocational competence. The study concerns participation in this initiative. Drawing on a socio-cultural perspective, vocational teachers’ CPD implies boundary-crossing between school and working-life. Theory concerning adults’ participation in education is considered relevant to understand conditions for such boundary-crossing, and learning, among vocational teachers. The article specifically investigates patterns in vocational teachers’ recurrent participation, which is expected to clarify the factors influencing further participation in professional development. The strongest predictor of recurrent participation, when adjusting for the influence of other factors, is the type of municipality that the teacher comes from, with low populated municipalities having the lowest likelihood of participation. Furthermore, recurrent participation is more likely by participating teachers from adult education or from privately owned schools, and by male teachers.  相似文献   

双重代码理论及其在英语阅读理解教学中的应用   总被引：3，自引：0，他引：3  

喻浩朋 《新乡师范高等专科学校学报》2005,19(5):119-121

双重代码理论认为,人类的大脑具有语言和非语言两套表现系统,语言系统处理语言信息,非语言系统处理非语言的输入。读者在使用语言系统的同时,会激发非语言系统,从而产生相应的意象和情感反应。对于外语的阅读教学来说,指导学生有意识地利用意象和情感反应以及隐喻是有效的教学方法。  相似文献   

光子晶体材料及其应用前景   总被引：2，自引：1，他引：2  

阿不都热苏力 《喀什师范学院学报》2002,23(3):44-46

介绍了光子晶体的基本概念，阐述了光子晶体的最新进展以及主要特性和应用。  相似文献   

Er:LN晶体的生长和激光性能研究     

茹占军  毕建聪  谢家兴  徐小龙 《宁波职业技术学院学报》2005,9(2):90-92

在LiNbO5中掺进(0、0．5、1．0、1．5mol％)Er2O5，以Czochrals技术生长LiNbO5、Er(1mol％)：LiNbO3、Er(2mol％)：LiNbO3、Er(3mol％)：LiNbO3晶体。测试Er：LiNbO3晶体的吸收光谱，确定晶体的泵浦波长，Er：LiNbO3晶体的吸收变相对LiNbO3晶体发生红移，红移的程度随Er^3 浓度的增加而增大。测试Er：LiNbO3晶体的荧光光谱，Er：LiNbO3晶体易实现激光震荡的波长4115／2→4115／2(～1．5μm)，是制作波导激光器的最合适的波长。测试Er：LiNbO3晶体的光损伤阅值，其结果高于LiNbO3晶体。Er(3mol％)：LiNbO3晶体的光损伤阀值比LiNbO3晶体高一个数量级。  相似文献   

Effect of Mixed Solvents and Additives on the Habit Modification of 6-APA Crystals     

龚俊波王静康  卫宏远 《天津大学学报(英文版)》2005,11(3):157-161

6-aminopenicillanic acid (6-APA) crystals obtained under different physical and chemical conditions of the solutions may present different habits. The habits of diamond-shaped plates are desirable compared with other habits of 6-APA crystals. To obtain ideal 6-APA crystals, the effects of the mixed solvents and additives on 6-APA crystal habits were investigated. Ethanol or acetone was used as the organic solvent, and impurities existing in the ,6-APA purification process were used as the additives. 6-APA growth habits were changed when the concentrations of ethanol, acetone or phenyl acetic acid were increased to exceed their critical concentration. The observed results show that the dominant face on 6-APA crystals was identified to be , {020}, but the overall habit was controlled by the relative growth rates of the : 101 and {002} faces. Crystal growth rates and habits can be appreciably changed by specific adsorption of additives on crystal faces. In some cases solvent molecules can act in a similar way and may be regarded as bulk additives. The effects of additives and organic solvents on 6-APA crystal habits were the results of adsorption effect,which fitted the experimental results quite well.  相似文献   

试论马克思主义历史决定论的双重属性   总被引：2，自引：0，他引：2  

陈永智 《山东教育学院学报》2005,20(1):49-52

马克思主义历史决定论既强调社会历史发展的决定性，又肯定其主体选择性。本在分别阐述其历史决定性和主体选择性的基础上，把二统一在一起，称之为马克思主义历史决定论的双重属性。  相似文献   

双机容错在医院信息系统安全中的应用     

罗颢 《中国科技信息》2005,(16):30

双机容错是计算机应用系统稳定、可靠、有效、持续运行的重要保证;为确保医院信息系统的正常运转,防止数据丢失,服务器采用双机容错是必要的。  相似文献