The results show that the extensional flow of melt in convergent die results in intense entrance elastic effect and distinct extrusion swell in conical die with different angles.

The deformation parameter and the orientation angle were typically introduced to describe the distorted drop in a shear or an extensional flow.

论述了剪切或拉伸流场中描述液滴形变的两个典型变量即变形度和取向角；

The constitutive equation of second order for disturbed extensional flow is used to study the instability of stretching sheet of viscoelastic fluid.

提出“准衰退记忆”新概念，发展了非牛顿流体扰动本构理论，并研究了粘弹流体拉伸流动的不稳定性规律。

Mechanism of Deformation and Breakup of Single Drop in a Shear or an Extensional Flow

剪切或拉伸流场中液滴的变形和破裂准则

Extensional Flow of Non-Newtonian Fluid in Fiber Spinning

非牛顿流体纺丝拉伸流动

Disturbed constitutive equation and instability of extensional flow of viscoelastic fluids

扰动本构方程及粘弹流体拉伸流动不稳定性

The largest extensional strain is 54 × 10-6, and the largest compression strain-26 × 10-6. Crust is in the state of compression for the southeastern Baikal Lake region, and compression is in the direction of NNW-SSE and NNE-SSW.

贝加尔湖东南部地壳处于压缩状态，压缩方向为NNW向和NNE向；

It is obvious by strain measure, petrofabric analysis, shear displacement amount counting and isotopic dating that ① the ductile shear zone's deformation belongs to plane simple-shear strain, and later the deformation translates into extensional strain.

应变测量、岩组分析、剪切位移量计算、同位素测年等定量分析表明：①以平面单剪应变为主，稍晚向伸长应变转化；

In the southwest, the principal compressive strain in Yunnan Province trends to northwest, and the compressive strain is corresponding to the extensional strain in magnitude.

青藏亚板块东南部东南段云南地区的主压应变方向为北西向，压应变和张应变量级相当。

With increasing the molecular weight of PTT melt, the extensional strain rate affected significantly the extensional viscosity of melt.

熔体的相对分子质量越高，拉伸速率对熔体的拉伸粘度影响越大。

For PPU1780F1, the extensional viscosity is higher and the elasticity is lower, so it is suitable for spunbonded nonwovens.

PPU1780F1拉伸粘度高、弹性小，适用于纺丝成网非织造布专用聚合物。

The extensional viscosity when polymer solution passing the size-varing pores is considered into Darcy viscosity, rebuilding the effective viscosity model in the Darcy Law.

把聚合物溶液通过拉伸&收缩的孔道时所表现的拉伸粘度，考虑到达西粘度中，重新建立了达西公式中的有效粘度模型。

The results show that the extensional viscosity of polymer melts changes with Hencky strain and strain rate.

实验结果表明：聚合物熔体拉伸粘度随应变、应变率而改变。

The relations between extensional viscosity and Hencky strain, strain rate and temperature are observed.

从熔体拉伸时瞬时拉伸粘度与应变、应变率的关系以及温度的影响，观察聚合物熔体拉伸变化规律。

Method of Study on Extensional Viscosity of Polymer Melts

聚合物熔体延伸粘度的研究方法

Development of Extensional Viscosity of Polymer Melts or Solutions

聚合物熔体或溶液拉伸黏度的研究状况

In this paper formulas of coupling coefficients for thickness extensional and thickness shearing vibration modes along rotated axis for Lithium Niobate were obtained by Methods of matrix calculating and tensor calculating.

本文利用晶体的压电、弹性、介电矩阵，通过矩阵及张量运算，推导出铌酸锂晶体厚度模机电耦合系数的精确公式。

Analytical Solution for Coupled Extensional-torsional Free Vibration of the Helical Spring

螺旋形弹簧拉扭耦合自由振动的解析解

Theoretical analyses show that the longitudinal vibration of a long slender rod, the radial and thickness extensional vibration of a thin plate can be obtained from the theory in this paper. Compared with numerical methods, the method of this paper is very simple.

理论分析表明，压电陶瓷细长棒的纵向振动，薄板的径向及厚度振动等都可由本文理论导出，与数值法相比，本文理论计算简单，物理意义明显。

The computation shows that parameters reflecting the tangential stiffness have more significant effects on torsion mode of structure than those on extensional vibration mode and flexural mode.

结果表明，描述结合面切向刚度大小的参数对结构的扭振刚度模态的影响比对纵向振动模态和弯曲模态的影响显著；

In this article, form the physical principle, the model and the equivalent circuit of thickness extensional vibration mode of thin film transformer is built.

本文从基本的物理学原理入手，建立了纵纵式厚度伸缩薄膜压电变压器的物理模型以及等效电路。