Based on the Hertz contact theory and curve beam theory,an analysis is made of the influence of the circumferential stress of the turntable support hollow wheels on the von Mises stress peak value and location of the wheel-rail contact.
以Hertz弹性接触理论和曲梁理论为基础,分析了回转支承空心钢轮的圆周应力对轮轨接触von Mises应力峰值及其位置的影响,通过采用平面应变有限元的进一步分析表明,降低钢轮截面梁高可以提高钢轮的径向柔度,同时圆周应力可以有效地抑制接触正应力,提高钢轮接触强度,但可能使钢轮接触区内von Mises应力峰值点从中间向两侧分离,导致应力循环次数翻倍,影响疲劳强度。
By analysing stereo-structures of the reaction products in several types of reactions,such as addition reation of alkene,β-elimination reaction of alcohol and the halohydrocabon,pericyclic reaction,we summarized the relationship between reactant structures and reaction mechanisms.
归纳了烯烃的加成、醇及卤代烃等化合物的β 消去、周环反应等反应产物的立体结构与反应物结构和反应历程的关系,探索出一种用简单的数学方法推知这些有机立体化学反应产物结构的方法。
A simplified form of the generalized Woodward-Hoffmann pericyclic selection rule (SGWH rule) is universally applicable to the pericyclic reactions of all kinds.
简化的普遍化 Woodward- Hoffmann周环选择定则 (SGWH定则 )可适用所有类型周环反应 。
We have demonstrated by using Dewar- Zimmerman selection rule that for any simple connected pericyclic reaction the statements of the Woodward- Hoffmann and Tang- Jiang selection rules are equivalent.
:用 Dewar- Zimm erm an选择定则说明了 Woodward- Hoffmann选择定则和唐 -江选择定则对任何简单联接周环反应都是等同的 。
Pericyclic Reactions and Woodward-- Hoffmann Rules
周环反应及伍德沃—霍夫曼规则(Ⅰ)
Periodic Solutions of the Cyclic and Predator-Prey Systems of Three Species with Holling s TypeⅢ Functional Response;
一类有HollingⅢ类功能性反应的三维循环捕食系统的周期解
EL DDR Enhanced Latency DDR
增强反应周期DDR内存
begging response from those around them.
询问周围人的反应。
primary circular reaction
初期循环反应 初期循环反应
Investigation on hydrolysis of ethyl benzoate in the presence of cyclodextrin as microreactor
环糊精微反应器中酯的水解反应研究
open-cycle reactor system
开式循环反应堆系统
dual cycle boiling water reactor system
双循环沸水反应堆系统
plutonium recycle test reactor
钚再循环试验反应堆
indirect cycle reactor system
间接循环反应堆系统
direct-cycle boiling water reactor
直接循环沸水反应堆
closed cycle gas cooled reactor
闭路循环气冷反应堆
once through reactor
燃料一次循环反应堆
controlled recirculation boiling water reactor
可控再循环沸水反应堆
closed cycle reactor system
闭合循环反应堆系统
natural circulation pressurized water reactor
自然循环压水反应堆
Photoperiod Responses of A Widely-adapted Soybean Cultivar of Zhonghuang 13
广适应大豆品种中黄13的光周期反应
The Existence of Positive Periodic Solutions for a Kind of Periodic Reaction-diffusion Equations
一类周期反应扩散方程正周期解的存在性
