共搜索到25744条信息，每页显示10条信息，共2575页。用时：0小时0分0秒473毫秒
Preparation of Rare Earth Doped Alumina-Siloxane Gel and Its ER Effect 井上真一1,李幼荣2,周兰香2,冈本宏1,邱关明3,张明2 (1.Department of Applied Chemistry, Aichi Institute of Technology, Toyota 470-0392, Japan... Mechanics, Changchun 130022, China) Abstract:Poly(methyl methacrylate) (PMMA) was used to wrap alumina-siloxane sol through emulsion polymerization. A kind of suspensions with notable ER effect......
最为广泛接受的观点就是体积效应(Volume effect),即超声振动的施加在塑性变形过程中对材料内部本构关系的影响.但已有"体积效应"的机理研究在该领域还不完善,定量理论还缺乏科学严谨的结论. 目前,对于"体积效应"的理论解释主要有两种.一种认为施加振动后材料的流动应力发生振荡,应力振荡导致材料平均流动应力下降,即应力叠加效应.KIRCHENER等[7]发现在塑性变形过程中施加振动后出现平均应...立一种应力叠加效应和声塑性效应混合的本构模型.各效应对于材料流动应力的影响如图1所示. 图1 超声振动"体积效应" Fig. 1 "Volume effect" of ultrasonic vibration(UV) 其中应力叠加模型可由金属材料弹塑性解释,并未造成材料塑性变形机制或材料参数的变化.先从非局部理论角度出发,考虑外部特征尺寸对材料内部微观结构的长程相互影响......
的变化规律并不相同；但是各自的表观活化能和指前因子随温度的变化规律相似,存在动力学补偿效应.通过对反应性指数,反应速率常数以及补偿线差异的分析,得出补偿线的高低可以成为判别不同钙基吸收剂分解快慢的一个依据.关键词:钙基吸收剂；煅烧；反应动力学；补偿效应Compensation effect in kinetics of Ca-based absorbents calcination... with the temperature according to different ways. However, there exists good kinetic compensation effect between their activation energy and pre-exponential factor. Through the analysis of the response index......
difference in the binding energy, the clusters at n=3 is more stable than others, and the magic numbers effect is also found. Key words: particle swarm optimization; Ni cluster; Sutton-Chen potential; magic numbers effect ......
Anneal and Concentration Effect on PL Properties of Sol-Gel Derived Eu3+ Doped SiO2 Glass Zhu Huiqun1,Wang Yi1,Ling Langsheng2,Ding Ruiqin1 (1.Institute of Thin Film and Nano Materials, Wuyi... anneal temperatures, and the optimized anneal temperature is observed around 700 ℃. The fluorescence-quenching effect can be observed in the emission spectra when the annealing temperature exceeds 700......
obviously with increasing the radius of alkali-earth metal ions; the mixed alkali effect appears when the glass contains a few kinds of alkali-earth metal oxides; when K+, Na+ and Li+ exist simultaneously in the glass, the two minimum peaks and complex mixed alkali effect can be observed from the composition-thermal expansion coefficient curve. Key words: glass; thermal expansion coefficient; mixed......
......
force reduction from the tests, which suggests that softening effect may be one of the other reasons to reduce the force. Key words: ultrasonic vibration; compression; stress superposition; friction effect 1 Introduction Nowadays ultrasonic vibration has been widely used in metallurgy, welding, machinery, food processing and chemical industry. Lots of researches on ultrasonic vibration assisted......
with particles is similar to that of covering ratio of the duct in the section. The down-horn effect of caliber changes with D/d, i.e. the smaller D/d, the more obvious the down-horn effect of caliber. Key words: particles; duct; size of nature; size effect 当今微米/纳米尺度的物理现象,微电子机械系统,"纳米器件",微尺度传热和流体运动等越来越引起人们广泛的关注. 在微尺度研究领域, 尺度效应是一个非常重要的概念[1-9].在此, 作者对粒子通过管道的过程进行分析, 描述粒子和管道的特征长度, 讨论粒子通过管道时两者特征尺度之间的相互关系, 探讨粒子......
, respectively. Addition of I- ion greatly improves the inhibition efficiency of fenugreek seeds extract for Zn corrosion in HCl due to the synergistic effect. Potentiodynamic polarization and EIS... of fenugreek. Key words: zinc; corrosion mechanism; inhibitor; synergetic effect 1 Introduction Due to environmental regulations, plant extracts have again become important as they are environmentally......
