用VRML实现虚拟燕大校园的浏览设计

VRML是一种崭新的网上虚拟现实技术，在众多应用中，虚拟旅游可以把你带入一个三维世界，实现旅游梦想。一些新技术如光照技术，触发器技术，多媒体技术的采用会使得三维场景更加生动逼真。对虚拟燕大校园的浏览设计到的VRML的相关技术进行了介绍。     

A Case Study of Search Engine on World Wide Web for Chemical Fiber Engineering

Search engine is an effective approach to promote the service quality of the World Wide Web. On terms of the analysis of search engines at home and abroad, the developing principle of search engines is given according to the requirement of Web information for chemical fiber engineering. The implementation method for the communication and dynamic refreshment of information on home page of the search engines are elaborated by using programming technology of Active Server Page 3.0 (ASP3.0). The query of chemical fiber information and automatic linking of chemical fiber Web sites can be easily realized by the developed search engine under Internet environment according to users' requirement.     

培养学生在工程实践中拓展数学与力学知识的能力

现代高技术领域取得的成果，在很大程度上是数学发展的结果．被称为数学镜子的力学，作为许多工程技术的基础学科，在机械、建筑、材料等工程专业中起着举足轻重的作用．学好数学和力学，是这些专业大学生科技创新的基础．受我国现行课程设置体制的约束，一般工科大学生都缺乏对数学和力学的系统学习．因此在工程实践中拓展他们数学与力学知识，提高应用水平是非常重要的．本文结合大学生科技创新能力培养与养成的议题，就如何在工程实践中拓展学生的数学与力学知识的问题，提出了若干观点和方法．     

InCu熔体结构的多度域分形分析

基于高温X射线衍射实验,利用多域分理论研究了InCu熔体内原子簇在不同温下时空特性,表征了InCu金熔体几构特征.果显示,In,In-1wt.%CuIn-20wt.%Cu熔体构是种部分重叠多域分构,InIn-1wt.%Cu低维分维数随着温升高而升高,In-20wt.%Cu熔体低维分维数随着温升高出现不规则变化,且分维数可作为构敏感参数反映金构变化.In-57wt.%Cu熔体构也存在分特性,但不存在多域特性.利用多域分模,计算了In,In-1wt.%CuIn-20wt.%Cu熔体多域分过区域原子个数,由模计算所lnN-lnr曲线与实验所致,lnN-lnr曲线最大误差不超过1.22%,多域分范围熔体构有着对应联系,测多域分过区域与熔体构特性有关.利用超微粒聚制释了熔体分貌.     

Effect of the silicon powder content on the properties of Al_2O_3-SiC-Me composites

By means of transient plastic phase process,the Al2O3-SiC-Me composites were produced throungh adding metal aluminium and silicon-powder to Al2O3-SiC materials.Under the condition of the same content of silicon and aluminium mixed-powder,the effect of silicon powder addition on properties of Al2O3-SiC-Me composites was studied by means of XRD and EPMA analyses in the temperature range of 300°C-1600°C.The results indicated that the content of metal phase in the sample at 1600°C increases with increasing silicon powder content.At the same time,when the temperature is lower than 1100°C,the strength of samples gradually increases with increasing temperature.However when the temperature is higher than 11000°C,the strength of samples gradually decreases with increasing temperature,and this change is very small.The results also indicated that at the same sintering temperature,the sample with 6%silicon powder has the maximum strength.     

An electrochemical and microstructural characterization of steel-mortar admixed with corrosion inhibitors

The present research brings new insights on the role of admixed corrosion inhibitors in the processes of cement hydration and rebar corrosion.The admixing of NaCl and the corrosion inhibitors in fresh mortar was found to alter the morphology and microstructure of the hardened mortar at the steel-mortar interfacial region.The admixing of the inhibitors increased the risk of carbonation of cement hydrates at the steel-mortar interfacial region,but partially displaced chloride ions. Chloride and the admixed in...     

On fractional control method for four-wheel-steering vehicle

Four-wheel-steering (4WS) system can enhance vehicle cornering ability by steering the rear wheels in accordance with the front wheels steering and vehicle status.With such steering control system,it becomes possible to improve the lateral stability and handling performance.In this paper,a new control method for 4WS vehicle is proposed,its rear wheels steering angle is in accordance with the angle of front wheels steering and vehicle yaw rate,and the effects of front wheels steering angle velocity are consi...     

Electronic structure, chemical bond and thermal stability of hydrogen absorber Li_2MgN_2H_2

The lowest total energy crystal structure of Li2MgN2H2 was identified by the first principle calculation with RPBE exchange-correlation function. Furthermore, the fine structure parameters of this crystal structure were calculated with PBE and PW91 exchange-correlation function. In a further step, the density of states, electron density, charge density difference on (0 0 1) plane and heat of formation of Li2MgN2H2 hydrogenation were computed with PW91 exchange-correlation function. Consequently, the electro...     

电液压力控制系统的模糊智能控制

以四辊冷轧机为对象，根据电液弯辊压力控制系统的特点，综合运用优化理论和模糊控制理论，对电液弯辊压力控制系统采用模糊智能控制进行了仿真研究，取得了满意的效果。     

Investigation of gas concentration cell based on LiSiPO electrolyte and Li_2CO_3,Au electrode

Solid lithium ion conducting electrochemical cells using LiSiPO as solid electrolyte and Li2CO3 mixed with Au as electrodes were prepared and employed as chemical sensors for the detection of CO2 gas.The EMF of the cell depends on the concentration of CO2 in air according to the partial pressure dependence of Nernst's law in the investigated range from 100 to 2000 ppm over the temperature range from 473 K to 673 K.