deformation retraction

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。

Analysis and Calculation of Reinforced Concrete Shrinkage;

钢筋混凝土的收缩变形分析及计算

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。

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。

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。

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。

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。

bishrinkage yarn

双收缩变形丝《化纤》

Longitudinal contraction deformation：The component contracts in the weld direction after weiding.

纵向收缩变形：构件焊后在焊缝方向上发生的收缩。

Transverse/cross/lateral contraction deformation：The component contracts in the upright direction of weld after weiding.

横向收缩变形：构件焊后在垂直焊缝方向上发生的收缩。

Factors Affecting Shrinkage of Self-Compacting Concrete at Early Age and Control;

自密实混凝土收缩变形的影响因素与控制

Experimental Study on Dry Shrinkage Deformation of Autoclaved Flyash-Lime Brick Masonry

蒸压粉煤灰砖墙体收缩变形性能试验研究

Welding Shrinkage Deformation and Residual Stress of Duplex Stainless Steel 2205

2205双相不锈钢焊接收缩变形与残余应力研究

STUDY ON THE SHRINKAGE DEFORMATION OF THIN COMPOSITE LAMINATES DURING CURING PROCESS

复合材料薄板的成型固化收缩变形研究

SHRINKAGE DISTRIBUTION OF CONCRETE WITH ONE SURFACE EXPOSED TO DRY CONDITION

单面干燥条件下混凝土的收缩变形分布特征

Highway and Railway Engineering Constringency Transmogrification Testing Study of Pavement Material and Thermal-force Coupled Analysis of Pavement Structure;

路面材料收缩变形试验研究及路面结构热—力耦合分析

The Shear Lag Effection and Concrete Deformation Research on Construction Stage on Wide Box Girder- Continuous Rigid Frame Bridge

宽箱梁连续刚构桥施工阶段剪力滞效应及混凝土收缩变形研究

contracted channe

收敛形管道, 收缩形流道

Analysis on creep strain for ready-mixed concrete during shrinkage

商品混凝土收缩过程中的徐变变形分析

Analysis on the Contraction and Time Deformation of Long-spanned PC Cable-stayed Bridges

大跨度PC斜拉桥收缩和徐变变形分析的研究

Curing Shrinkage and Warpage Deformation of Composite Thin Laminates at Room Temperature

复合材料薄层板常温固化收缩及翘曲变形

The Structure and Properties of Differential Shrinkage Multi-filament Air-jet Texturized Yarn;

异收缩丝空气变形（多重变形）加工成纱结构与性能

That gradually would reduce the orbit from an elongated ellipse to smaller, progressively more circular shapes.

这麽做会逐渐将轨道从扁长椭圆形收缩成较小且逐渐变圆的形状。

Freyssinet flat jacks may be required to compensate for distortions arising from creep and shrinkage.

弗涅新奈氏扁千斤顶可用以调整收缩与徐变产生的变形。

Study of strain rate imaging in evaluating the postsystolie shortening in ischemic myocardium

应变率成像评价缺血心肌收缩后收缩