检索结果-南通市图书馆

Preparation and Properties of Super-hydrophobic Surface by Fluorinated Copolymers

第三届全国有机化学学术会议

作者： LIN, He-Chun YANG, Li LI, Chao-Zhong (State key laboratory of applied Chemistry, Lanzhou University, Lanzhou 730000) shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , shanghai 200032 )

＜正＞ We report here the first alkyl radical additions of （η6-arene）tricarbonylmanganese complexes in the presence ofalkylmercury chloride and NaI（Eq. 1）. The mechanism was postulated to be the alkyl radical addition to ArMn-（CO）3+ cation to form the corresponding 17 valence electron intermediate, which was then reduced by alkylmercurychloride via a single electron transfer process to afford the product and regenerate an alkyl radical.

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

复旦学报（自然科学版） 2007年第5期46卷 800-,804页

作者： Wei Haiyang, He Wenxiao, Li Xinxin, Han Zhewen(key laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, shanghai, 200237,China)

1 Rusults Fig.1 Surface morphologies of the PMMA-PFAEA copolymer filmsa-e, Random copolymer, a-e, synthesized by micro emulsion polymerization,a)b), MMA:FAEA=2:1, c) d), MMA:FAEA=5:1; e) synthesized by solution polymerization, MMA:FAEA=7:3; f) Block copolymer, synthesized by RAFT polymerization, MMA:FAEA=4:1, all solution concentration 1×10-2g/mL Super-hydrophobic surfaces have attracted significant attention recently, and various preparing methods have been reported. Besides these preparing methods, s...

关键词： Super-hydrophobic perfluoroalkylethyl acrylate random copolymer block copolymer solvent evaporation-phase separation

Experimental study of delayed positive feedback control for a flexible beam

在线全文

学校读者我要写书评

暂无评论

Theoretical & applied Mechanics Letters 2011年第6期1卷 57-62页

作者： Kun Liu, Longxiang Chen, and Guoping Cai) Department of Engineering Mechanics, State key laboratory of Ocean Engineering, shanghai Jiaotong University, shanghai 200240, China Department of Engineering Mechanics State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200240 China

Recently, some researches indicate that positive feedback can benefit the control if appropriate time delay is intentionally introduced into control system. However, most work is theoretical one but few are experimental. This paper presents theoretical and experimental studies of delayed positive feedback control technique using a flexible beam as research object. The positive feedback weighting coefficient is designed by using the optimal control method. The available time delay is determined by analyzing the maximal real part of characteristic roots of the system. A DSP-based experiment system is introduced. Simulation and experimental results indicate that the delayed positive feedback control may effectively reduce the beam vibration if time delay is appropriately selected.

关键词： flexible beam delayed positive feedback control experiment

Preparation of InSb nanocrystals embedded in SiO_2 thin films

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第19期43卷 1610-1615页

作者： ZHU Kaigui 1, SHI Jianzhong 1, WEI Yanfeng 2 and ZHANG Lide 1 1. Institute of Solid State Physics, Chinese Academy of Science, Hefei 230031, China 2. State key laboratory of Surface Physics, Fudan University, shanghai 200433, China Institute of Solid State Physics Chinese Academy of Science Hefei China State key laboratory of Surface Physics Fudan University Shanghai China

InSb nanocrystals embedded in SiO 2 thin films were prepared by rf magnetron cosputtering technique. THe observation by transmission electron microscope showed that InSb nanocrystals dispersed uniformly in SiO-2 matrices. InSb nanocrystals with different sizes can be obtained by changing the annealing condition. The average size of InSb nanocrystals depended on annealing temperature and time, but not on the t 1/3 rules. X-ray photoelectron spectroscopy and X-ray diffraction were also applied to the analyses of the composite thin films.

关键词： InSb nanocrystals radio-frequency sputtering quantum confinement.

在线全文

学校读者我要写书评

暂无评论

基于网格的汽车耐撞性数值分析系统及其应用

上海交通大学学报 2011年第9期45卷 1304-1309页

作者：翁依柳金先龙上海交通大学振动、冲击、噪声国家重点实验室机械与动力工程学院上海200240

基于网格技术以及数值分析理论,分析了网格应用中间件以及具有4层结构的汽车耐撞性数值分析网格体系结构,结合耐撞性理论,提出了汽车耐撞性协同仿真和分布式耐撞性数据挖掘方法,实现了汽车耐撞性协同仿真应用系统与汽车耐撞性数据挖掘... 详细信息

基于网格技术以及数值分析理论,分析了网格应用中间件以及具有4层结构的汽车耐撞性数值分析网格体系结构,结合耐撞性理论,提出了汽车耐撞性协同仿真和分布式耐撞性数据挖掘方法,实现了汽车耐撞性协同仿真应用系统与汽车耐撞性数据挖掘应用系统的融合.同时,结合应用实例,将所提出的方法及系统应用于汽车协同仿真及耐撞性数据挖掘活动中,取得了良好的效果.

关键词：汽车耐撞性网格计算计算机辅助工程有限元分析

A study on the development trends of tourist marketing policies in the 21^(ST) century

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2000年第4期10卷 89-93页

作者： GUO Ying-zhi (Postdoctoral Station of applied Economics, Fudan University, shanghai 200433, China) 复旦大学上海

From the view point of tourist marketing, tourist features of popularity and mass, brand and sense, quality and comfort, level and difference, prevalence and society are studied, and the development trends of tourist marketing policies in the 21st century are put forward in this paper. Such as combining sustainable strategies in tourist development with ecology in green marketing, combining information of tourist trends with network in knowledge marketing, combining innovation in tourist products with diversification in marketing objects, combining levels in marketing goals with integer in marketing decision, combining solid in marketing measures with flexibility in marketing policies, combining conformity in marketing channels with double directions in marketing communication and combining the systems of marketing service with culture in marketing activities.

关键词： 21st century tourist marketing policy development trend

A generalized wave action conservative equation for the dissipative dynamical system in the nearshore region

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2003年第7期 72-74页

作者： HUANG Hu (1. shanghai Institute of applied mathematics and Mechanics, shanghai University, shanghai 200072, China 2. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China)

To describe the various complex mechanisms of the dissipative dynamical system between waves, currents, and bottoms in the nearshore region that induce typically the wave motion on large-scale variation of ambient currents, a generalized wave action equation for the dissipative dynamical system in the nearshore region is developed by using the mean-flow equations based on the Navier-Stokes equations of viscous fluid, thus raising two new concepts: the vertical velocity wave action and the dissipative wave action, extending the classical concept, wave action, from the ideal averaged flow conservative system into the real averaged flow dissipative system (that is, the generalized conservative system). It will have more applications.

关键词： dissipative dynamical system wave action conservation the averaged flow equations the Navier-Stokes equations.

基于界面端奇异性理论的单纤维拔出试验的试件设计

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

力学季刊 2004年第3期25卷 337-341页

作者：戴瑛嵇醒固体力学教育部重点实验室

在单纤维拔出试验中,由于试件的界面端存在应力奇异性,这使试验所得到的界面剪切强度数据失去合理性[1]。但从文献[1]关于微珠脱粘试验研究的结论中可以发现当基体的楔形角小于某临界角度后,微珠试件界面端应力奇异性几乎消失。由此启... 详细信息

在单纤维拔出试验中,由于试件的界面端存在应力奇异性,这使试验所得到的界面剪切强度数据失去合理性[1]。但从文献[1]关于微珠脱粘试验研究的结论中可以发现当基体的楔形角小于某临界角度后,微珠试件界面端应力奇异性几乎消失。由此启发我们设计出一种楔形角小于该纤维／基体系统临界角的锥面的拔出试件,这样即可以防止出现传统拔出试件在界面端的强应力奇异性,又可以避免微珠脱粘试验自身的缺陷。界面端具有任意楔形角的轴对称模型被用于分析和确定纤维／基体系统的临界角,对方程进行渐近展开和分离变量处理,根据边界条件可以得到关于特征值λ的特征方程,针对确定的纤维／基体系统可以得到特征值和楔形角的关系曲线,我们把应力奇异性指数等于-0.005时所对应的楔形角定义为临界角,以及根据临界角设计锥面拔出试件的方法。

关键词：锥面拔出试件界面剪切强度应力奇异性

Modeling and LPV Control of Web Winding System with Sinusoidal Tension Disturbance

在线全文

学校读者我要写书评

暂无评论

Modeling and LPV Control of Web Winding System with Sinusoid...