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   

浅谈云计算及其发展现状     

涂小强  陈海莲 《科技广场》2011,(3)

云计算是基于多种技术的商业计算模型,将是21世纪的一种发展趋势,本文主要介绍了云计算的概念、特点、实现机制、提供的服务以及目前国内外的研究发展现状。  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   

Beijing's West District Library Enhances International Cooperation     

Xi Tu 《中外文化交流(英文版)》2011,(10):46-47

<正>The West District Library of Beijing is China’s first county/district-level public library granted with the member status of the International Federation of ...  相似文献   

高职制药校内外生产性实训基地功能定位探析     

阮建兵  李倩  张婷  涂小进  金学平 《黄冈职业技术学院学报》2014,(1):95-97

针对高职制药类专业生产性实训基地建设水平低的现状,分析制药校内外生产性实训基地发展缓慢的原因,提出制药生产性实训基地建设首先要解决功能定位问题;制药类专业生产性实训基地应以药物研发、社会服务为方向,将“药品生产”型实训基地通过深化校企合作建在校外企业。  相似文献   

任务型教学法在高级英语教学中的应用     

涂青青 《安顺师范高等专科学校学报》2014,(1):73-75

以学生为中心的任务型教学法在独立学院高校英语专业教学中的应用日渐普遍。文章以高级英语教学实践为例,重点分析根据任务型教学法的原则和结构模式,合理设计独立学院高级英语课堂教学任务。  相似文献