1) deformation retraction
形变收缩核
1.
In this paper,we generalize the direct product theroem of the fundamental groups on the product space X×Y to that on the product space of X_1×X_2×…×X_n,and discuss their deformation retractions.
文章将乘积空间X×Y的基本群直积定理推广至乘积空间X1×X2×…×Xn上,并相应的讨论了乘积空间的形变收缩核,从而得到一些有趣的结论及性质。
2) strong deformation retract
强形变收缩核
3) weak deformation retract
弱变形收缩核
4) shrinkage
[英]['ʃrɪŋkɪdʒ] [美]['ʃrɪŋkɪdʒ]
收缩变形
1.
Analysis and Calculation of Reinforced Concrete Shrinkage;
钢筋混凝土的收缩变形分析及计算
2.
The cause for volumetric shrinkage and warpage was ana- lyzed.
以某厂生产的精密塑件——电子接插件为例,通过分析该塑件体收缩变形和翘曲变形的原因,以正交试验为设计准则,利用 Moldflow 软件对各种工艺参数组合进行注射成型过程的模拟。
3.
In order to study the early-age cracking tendency of high strength concrete under circumfer-entially restrained condition, the non-contact shrinkage measuring device was developed to determine the free shrinkage of high strength concrete with water to cement ratio of 0.
为研究环向约束条件下高强混凝土早期开裂趋势,在单面干燥条件下应用非接触式混凝土收缩变形测定仪测试了水灰比为0。
5) contraction distortion
收缩变形
1.
By use of digital camera to collect picture quickly and technology of computer to deal with picture, a new measurement method for residual contraction distortion after welding is introduced in this article.
介绍了一种应用数码相机快速采集图象和计算机的数字图象处理技术实现焊后收缩变形测量的新方法。
6) shrinkage strain
收缩变形
1.
The technology of injection molding of PP-R fittings was conditioned to reduce their shrinkage strain and to make PP-R fittings keep a good appearance and properties.
通过对无规共聚聚丙烯(PP-R)管件成型加工过程中分子排布、取向、收缩等特性的分析,总结出影响制品收缩变形的因素有注射量、注射速率、注塑压力、注射温度、模具温度、注射时间、保压时间、制品壁厚及浇口尺寸等,对PP-R管件的注塑工艺进行了调整与优化,减少了PP-R管件的收缩变形,对PP-R管件的生产有指导作用。
2.
The shrinkage strain,crack length and width are measured when the shrinking of mortar becomes stable.
研究了砂浆早期(0~6 h)的收缩变形特性,测试了其收缩变形量及变形稳定后裂缝的长度与宽度。
补充资料:收缩核
收缩核
retract
代数和拓扑中相应概念的一个推广.范畴只中的对象R叫作对象A的收缩核(re赶公ct),是指有态射 召:R~A和v:A~R使v拜二1,.这时#是单态射(monoTnorp地m),也是态射对1,和产v的等化子.对偶地,v是满态射(ePimo印恤m),也是态射对1月,拜v的余等化子.有时群叫作截面(s以力on),,叫作收缩(ret陇·tion). 若R是对象A的一个收缩核,R‘同构于R,则R’也是A的一个收缩核.从而收缩核的一个同构类构成A的一个子对象.A的由态射群:R~A和v:A~R定义的收缩核对应于一个幂等态射甲二拜v:A~A·对象A的两个收缩核R和R‘属于同一个子对象,当且仅当它们对应于同一个幂等元.任意范畴中任一对象的收缩核构成一个集合.M.山.UaJIeHK。撰拼卜注】最后一句话仅当假定所讨论的范畴是局部小时才对(即“有小hom集”)(亦见小范畴(srr么11。吐cgory)).张英伯译收缩核〔“由旧改;Pe,娜],范畴中一个对象的
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