中国与瑞典的高校教师压力成因比较     

涂丽 《中国科技信息》2006,(19):228-229,231

我国高校教师压力随着经济实力的增长，和教学改革的推进而不断增大，原因来自于社会、学校和自身各方面，本文主要通过与瑞典高校教师的压力的比较，吸取国外优秀的经验，解决我国对前存在的教师压力问题。  相似文献   

用CSocket类实现点对点通信     

涂婧璐  王柔刚  全智龙 《科技广场》2005,(8):44-46

本文简要介绍了在VC＋＋中网络编程的几种方式及通信协议，重点讲解了在VC＋＋中使用CSocket类按照二进制数据格式点对实现点通信的一种简单方法。  相似文献   

冷杉属一新种——梵净山冷杉     

黄威廉  屠玉麟  杨龙 《中国科学院研究生院学报》1984,22(2):154-155

  相似文献   

我国国债发行规模及期限结构探讨   总被引：1，自引：0，他引：1  

林英晖  屠梅曾 《科学．经济．社会》2001,19(4):44-48

在分析了我国国债发行规模及期限结构现状的基础上，探讨了国债发行规模过大所蕴藏的风险以及单一化的期限结构所带来的不利影响。对国债发行量及期限结构提出了一些建议。  相似文献   

某公司汽轮发电机叶片断裂事故分析     

涂湛 《科技广场》2007,(1):241-242

某公司汽轮发电机发生汽轮机叶片断裂事故,从宏观检查、材质元素化学分析、材料微观组织、硬度等方面进行分析,找出了叶片断裂原因,并对以后检修提出了建议。  相似文献   

几种药用植物基因组DNA提取方法研究   总被引：3，自引：0，他引：3  

冯图  黎云祥 《毕节学院学报》2011,29(8):98-101,128

采用改良2×CTAB法和改良SDS法提取富含多糖和次生代谢物质的几种药用植物不同器官基因组DNA,并用紫外分光光度计分析,凝胶电泳和PCR扩增进行鉴定。结果表明:改良2×CTAB法和改良SDS法均能有效去除不同药用植物材料中的蛋白质、多糖、酚类及其他次生代谢物质,获得较高质量基因组DNA。但与改良SDS法相比,改良2×CTAB法提取的基因组DNA质量更好。  相似文献   

Optimal ϵ -stealthy attack in cyber-physical systems     

Weiwei Tu  Jiuxiang Dong  Ding Zhai 《Journal of The Franklin Institute》2021,358(1):151-171

This paper is concerned with the optimal stealthy attack problems of cyber-physical system, which is represented as discrete-time linear systems. It is considered that a deceptive attack assumed to be able to hijack and modify the nominal control signals from the controller-actuator channel with the metric of ? -stealthiness. Different from the existing literatures, some optimal attack strategies with objectives such that maintaining a fixed level of stealthiness and achieving the maximized performance degradation are designed under some constraints. It is further derived that the results of ours are more relaxed than some methods proposed before. Finally, some numerical simulations are given to illustrate the validity of the theoretical results.  相似文献   

基于社会复杂网络的学科交叉研究     

张洪磊  魏建香  杜振东  刘向  严顺  冯泽  李晓迪  冯学风 《情报杂志》2011,(10)

利用社会网络分析方法和Ucinet工具,对情报学与计算机科学两个学科近10年来国内核心期刊文献进行学科交叉实证研究。构建基于引用关系的作者网络与文献网络并深入探讨两个学科研究的交叉关系。  相似文献   

Electrophoretic separation of neurotransmitters on a polystyrene nano-sphere∕polystyrene sulphonate coated poly(dimethylsiloxane) microchannel     

Zhao J  Zhang Q  Yang H  Tu Y 《Biomicrofluidics》2011,5(3):34104-341049

In this paper, a poly(dimethylsiloxane) microchip with amperometric detector was developed for the electrophoretic separation and determination of neurotransmitters. For increasing the separation efficiency, the microchannel is modified by polystyrene sulphonate∕polystyrene nano-sphere self-assembly coating. A stable electro-osmotic flow (EOF) and higher separation efficiency are obtained in proposed modified microchannel. Under optimized conditions, dopamine, epinephrine, catechol, and serotonin are acceptably baseline separated in this 3.5 cm length separation channel with the theoretical plate number from 4.6?×?10(4) to 2.1?×?10(5) per meter and resolution from 1.29 to 12.5. The practicability of proposed microchip is validated by the recovery test with cerebrospinal fluid as real sample which resulted from 91.7% to 106.5%.  相似文献   

Electrophoretic separation of neurotransmitters on a polystyrene nano-sphere�Mpolystyrene sulphonate coated poly(dimethylsiloxane) microchannel     

Jinjin Zhao  Qianli Zhang  Huijuan Yang  Yifeng Tu 《Biomicrofluidics》2011,5(3):034104-034104-9

In this paper, a poly(dimethylsiloxane) microchip with amperometric detector was developed for the electrophoretic separation and determination of neurotransmitters. For increasing the separation efficiency, the microchannel is modified by polystyrene sulphonate∕polystyrene nano-sphere self-assembly coating. A stable electro-osmotic flow (EOF) and higher separation efficiency are obtained in proposed modified microchannel. Under optimized conditions, dopamine, epinephrine, catechol, and serotonin are acceptably baseline separated in this 3.5 cm length separation channel with the theoretical plate number from 4.6 × 10⁴ to 2.1 × 10⁵ per meter and resolution from 1.29 to 12.5. The practicability of proposed microchip is validated by the recovery test with cerebrospinal fluid as real sample which resulted from 91.7% to 106.5%.  相似文献