检索结果-南通市图书馆

Strategies of Teaching College English

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

吉林工程技术师范学院学报 2005年第10期21卷 42-43页

作者： Wang Kun(Jilin Teachers institute of engineering and {2.,Changchun Jilin 13.052.

Teaching college English in large classes is a new challenge to *** meet this chal-lenge,the strategy of MAI(Multimedia Assisted Instruction) and cooperative learning is ***′s more,positive judgment of students′work... 详细信息

关键词： MAI cooperative learning positive judgment

水中亚硝酸根的表面活性剂增敏催化动力学流动注射荧光法测定

在线全文

学校读者我要写书评

暂无评论

分析测试学报 2003年第4期22卷 32-34页

作者：徐远金李海云姚志雄黄天寿广西大学糖业工程技术研究中心广西南宁530004 桂林工学院材料与化学工程系广西桂林541004 广西大学化学化工学院广西南宁530004

研究发现十二烷基硫酸钠对稀磷酸介质中亚硝酸根催化溴酸钾氧化藏红T有显著的增敏作用 ;据此建立了催化动力学流动注射荧光法测定痕量亚硝酸根的方法 ,方法检出限为0.2.g/L ,线性范围为0.5～2..0μg/L,进样频率为72./h;该法用于水样... 详细信息

研究发现十二烷基硫酸钠对稀磷酸介质中亚硝酸根催化溴酸钾氧化藏红T有显著的增敏作用 ;据此建立了催化动力学流动注射荧光法测定痕量亚硝酸根的方法 ,方法检出限为0.2.g/L ,线性范围为0.5～2..0μg/L,进样频率为72./h;该法用于水样中亚硝酸根的测定。

关键词：水亚硝酸根表面活性剂增敏作用催化动力学流动注射荧光法测定环境监测食品分析

CAD/CAM ALGORITHM OF RULED SURFACE BASED ON LINE GEOMETRY

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical engineering 1998年第3期11卷 44-48页

作者： Hu Zhanqi Cui Yunqi Qiao Lei Li Yupeng Mechanical engineering institute, Yanshan University Yanshan Univ China

A new concept of design and manufacturing of ruled surface based on line geometry is proposed. Some practical algorithm for CAD system is derived. Some problems in design and manufacturing of ruled surface can be solv... 详细信息

关键词： Ruled surface Line geometry Wire cut EDM

Reconstruction of human embryos derived from somatic cells

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2003年第17期48卷 1840-1843页

作者： LU Changfu, LIN Ge, XIE Changqing, GONG Fei, ZHOU Hong, TAN Yueqiu & LU Guangxiu institute of Reproduction and Stem Cell engineering of South University, Changsha, Hunan 410078, {2. institute Reproduction and Stem Cell engineering of South University Changsha Hunan 410078 China

Reconstruction of human nuclear transfer em-bryos is a necessary step of therapeutic cloning. In this study we injected somatic cell nuclei into MⅡ oocytes and acti-vated reconstructed oocytes with calcium ionophore A2.187 (CaA) and 6-dimethylaminopurine (6-DMAP). After oocyte activation and 2.N formation, we removed the female PN. By using this method, we avoided the application of DNA fluorescent stain and ultraviolet light for oocyte enucleation, and over elimination of ooplasm was also mitigated. Some reconstructed embryos developed into the blastocyst stage in vitro.

关键词：人体细胞胚胎干细胞细胞核移植晶胚钙离子载体卵母细胞

For a Class of Linear Systems LMI-Based Design of Reliable Tracking Control

在线全文

学校读者我要写书评

暂无评论

For a Class of Linear Systems LMI-Based Design of Reliable T...

2.10 Chinese Control and Decision Conference

作者： Bo Yao~1,Fuzhong Wang~2.Shuai Wang~3.1.College of Mathematics and System Science,Shenyang Normal University,Shenyang,11003.,china 2.Shenyang {3. of {2.,Shenyang 11013.,china 3.School of life Sciences,Xiamen University,Xiamen 3.1005,china

＜正＞For a class of linear systems,the paper studies the reliable tracking controller design problem against actuator faults.A sufficient condition for the existence of a reliable tracking controller is *** a reliable tracking controller design method is *** method is based on linear guaranteed cost tracking performance index and linear matrix inequalities（LMIs）.The simulation illustrates the design procedures and their *** comparisons of the reliable tracking controller and the normal tracking controller show the necessity of reliable tracking control.

关键词： reliable tracking controller actuator faults guaranteed cost linear matrix inequalities

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

动态测量数据野值的辨识与剔除

系统工程与电子技术 2004年第2期26卷 147-149,190页

作者：祝转民秋宏兴李济生黄永宣西安卫星测控中心陕西西安710043 西安交通大学系统工程研究所陕西西安710041

分析了动态测量数据中产生野值的原因及其特征,讨论了野值对滤波以及数据处理精度的影响。以"新息"为基础,通过对卡尔曼滤波方法中增益矩阵的改进,提出了野值辨识和剔除方法。仿真计算和实际工程应用表明,该方法可使野值的剔除与状态估... 详细信息

分析了动态测量数据中产生野值的原因及其特征,讨论了野值对滤波以及数据处理精度的影响。以"新息"为基础,通过对卡尔曼滤波方法中增益矩阵的改进,提出了野值辨识和剔除方法。仿真计算和实际工程应用表明,该方法可使野值的剔除与状态估计同时进行,提高了计算速度和数据处理的精度,同时可有效解决滤波发散问题,是实用可靠的工程方法。

关键词：靶场外测动态测量数据野值新息序列 Kalman滤波数据处理

Traffic Impact Analysis of the Access to Projects on Traffic Performance of Nearby Roadways

在线全文

学校读者我要写书评

暂无评论

Journal of Southwest Jiaotong University(English Edition) 2010年第4期18卷 289-294页

作者：宋菲曹静杨孝宽 Key Laboratory of Traffic engineering in Beijing Department of Civil EngineeringBeijing University of Technology

Access to any development is a connection between the buildings and urban roadways. The impact of access on urban roads varies with location of the access. This paper studies the impact of access to large buildings on the surrounding road network by exploring traffic conflicts based on the configuration of the access. The concept of conflict intensity is introduced in this study as a new evaluation indicator to evaluate the traffic conflict triggered by the presence of access. The results show that the greater the speed,the greater the conflict intensity of access. Meanwhile,a similar situation exists when other variables （e.g.,conflict angle or the number of conflicts） change. The larger the conflict intensity,the more dangerous the access. Results from this study can help developers and traffic engineers choose suitable locations of access and organize the traffic in a logical manner.

关键词： Traffic impact study Access of large buildings Conflict density Quantitative analysis

Green Degree Theory and Its Application in Process engineering

在线全文

学校读者我要写书评

暂无评论

Green Degree Theory and Its Application in Process Engineeri...

氮化硅/石墨激光合金化涂层的组织结构与性能研究

第四届中美化学工程会议和第三届中日化工研讨会合并的三边化学工程大会

作者： Xiangping Zhang institute of process engineering, {2.

Sustainable development and serious environmental problem require systematic theory and specific method to measure, compare and analyse the environmental issues, including environment, health, safety, economics and social problem, and to design and improve the process. In this paper, combining the green chemistry principle and system engineering methodology, green degree (GD) theory is proposed systematically to improve the environmental impacts of product and process while also offering economic incentives, implement the environmental conscious process design.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国激光 2003年第9期30卷 855-858页

作者：王黎钦应丽霞张三川齐毓霖哈尔滨工业大学机电工程学院黑龙江哈尔滨150001 郑州大学机械工程系河南郑州450052

为获得金属表面特别是高副接触金属表面含自润滑特性且具有高硬度耐磨特性的功能材料 ,研究了 45 # 钢表面激光合金化氮化硅 /石墨复合涂层的工艺方法、组织特征、界面形态及其形成机制 ,利用光学显微镜、扫描电镜和X射线能谱对所形成... 详细信息

为获得金属表面特别是高副接触金属表面含自润滑特性且具有高硬度耐磨特性的功能材料 ,研究了 45 # 钢表面激光合金化氮化硅 /石墨复合涂层的工艺方法、组织特征、界面形态及其形成机制 ,利用光学显微镜、扫描电镜和X射线能谱对所形成合金化层的元素分布和含量进行了分析 ,并对试样硬度进行了测定。结果表明 ,合金化层中元素Fe ,Co ,Si,C分布均匀 ;C含量达到了 15 6 9%,大部分以石墨的形式存在 ,具有一定的自润滑性能 ;但在形成合金化层的温度条件下 ,氮化硅分解严重 ;合金化层硬度提高的主要原因是Si Fe ,Co Fe固溶体的强化作用及高碳马氏体的生成和高硬度碳化物的存在。

关键词：激光技术激光合金化氮化硅石墨自润滑