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91.
Various solvent systems capable of dissolving cellulose have been reported in the literature. Cuene (cupriethylene diamine hydroxide) and FeTNa (ferric sodium tartrate) are well known examples. Preliminary experiments were conducted with Cuene and FeTNa to determine if the cellulose dissolving ability of these systems could be used to bond yellow birch veneers. The results indicate that relatively high dry shear strengths, and low wet shear strengths are obtained. 相似文献
92.
Yang Daofu Liu Shenli Yellow River Conservancy Technical Institute Kaifeng China Zhengzhou Institute of Light Industry Zhengzhou China 《计算机辅助绘图.设计与制造(英文版)》2003,(Z1)
1 Introduction With the approach of the era of global economy, science and technology, there will be great changes in the personnel market of China. We can introduce advanced technology and qualified scientists and technicians but can not introduce so many personnel with higher vocational skills, who can turn the research achievements into productive forces. It抯 necessary to advocate 揅ompetency Based Education?in the higher vocational and technical education. Graphics education is one of … 相似文献
93.
The performance of adhesive bonded joints depends on many factors, one of which is the adhesive formulation. The effects of organic and inorganic fillers upon the fracture toughness of phenol–resorchinol–formaldehyde adhesive in hard maple joints were explored in this study. Analytical techniques (DSC, IR, SEM, and GPC), and solubility studies were employed to relate physical effects to chemical effects of teh fillers. The resin showed two distinct stages of cure: (1) a low temperature exotherm associated with resorcinol and paraformaldehyde and (2) a high temperature endotherm associated with the base resin. Filler was found not to affect the cure. Fillers did have a profound effect on the morphology of the wood-adhesive interphase and upon the bulk adhesive properties. These effects, revealed in both SEM and fracture toughness studies, are discussed at lenghth. 相似文献
94.
LIU Shi-he YIN Shu-ran College of Water Resource Hydropower Wuhan University Wuhan China GUO Wei Yangtze River Scientific Research Institute Wuhan China 《水动力学研究与进展(B辑)》2010,22(1):103-109
The sand dunes are typical bed forms of natural alluvial rivers.In this article,a vertical 2-D Reynolds stress model is established for the simulation of turbulent flows around sand dunes,and water-sand boundary conditions are set with particular attention.By numerical simulations,the following conclusions can be drawn.(1) The flow resistance in rivers with sand dunes could be divided into the sand-grain resistance and the sand dune resistance,and the sand-grain resistance coefficient mainly depends on Reyn... 相似文献
95.
Ding Zhuo-yi Yangtze River Scientific Research Institute Wuhan Hubei P.R.China 《水动力学研究与进展(B辑)》1992,(4)
Using four types of stilling basin models,this paper studies frequency characteris-tics of the fluctuating pressure acting on the stilling basin apron when Froude number is notgreater than 4.5.The testing results show that the frequency of fluctuating pressure,f_s in theranges of 0. 4Hz≤f_s≤1.1Hz.0.2Hz≤f_s≤2.5Hz and 0.4Hz≤f_s≤3.3Hz.can be used as thedesign frequency corresponding to three patterns of hydraulic jump.The reliability of f_s for threejump patterns is all nearly equal to 90%. 相似文献
96.
小浪底工程规模大,地下洞室多,地质条件复杂,原型观测对枢纽安全运行具有十分重要的意义。本文系统介绍了工程安全监测数据采集系统的结构及配置、测站布置、功能要求、系统操作、系统软件、实施情况等。 相似文献
97.
基于云计算的WebGIS系统构建探析 总被引:1,自引:0,他引:1
云计算作为一种技术趋势正迅速兴起,云架构和云服务所提供的技术和体系结构是当今地理信息系统研究和发展的关键领域。本文利用云计算和WebGIS均是基于网络化应用的相同之处,提出了基于云计算构建WebGIS系统的观点,阐述了基于云计算的WebGIS系统层级结构和应用体系结构设计方法,实现对海量空间数据存储、进行各种空间信息检索和空间分析的有力支撑。 相似文献
98.
GU ChongShi HE XianFeng WU ZhongRu & SU HuaiZhi College of Water Conservancy Hydropower Engineering Hohai University Nanjing China National Engineering Research Center of Water Resources Efficient Utilization Engineering Safety Yellow River Institute of Hydraulic Research Zhengzhou Embankment Security Defect Prevention Control Engineering Research Center of MWR 《中国科学E辑(英文版)》2008,(Z2)
In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are analyzed.The concept of landslide risk degree is put forward to measure the threat of landslide to dam safety.The monotony of the landslide risk assessment function which changes with different affecting factors is analyzed qualitatively.Based on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with im... 相似文献
99.
Liu Shenli Yang Daofu Liu Jipeng Zhengzhou Institute of Light Industry Zhengzhou China Yellow River Conservancy Technical Institute Kaifeng China Zhengzhou Economic Management Institute Zhengzhou China 《计算机辅助绘图.设计与制造(英文版)》2003,(Z1)
1 Reform of Mechanical Curriculum System is the Needs of the Times 1.1 The Great Changes of Designing Methods and Manufacturing Techniques With the development of science and technology, our society has come to the era of knowledge economy and informatization. Informatization represents not only advanced manufacturing and management, but also enterprises?competition capacity. Moreover, it is important to join in international competition and cooperation. For example, the breakthrough in… 相似文献
100.