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In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory. The key techniques used in numerical simulation of the three-dimensional extrusion from dies such as decision of boundary conditions, creation of initial velocity field, selection of penalty factor, high Weissenberg number problem , regeneration of the free surface were studied in detail.

中文题名聚合物异型材口模挤出三维流动研究副题名外文题名 Study on three-dimensional flow of polymer melts during the process of profile extrusion from dies 论文作者涂志刚导师柳和生包忠诩教授学科专业材料加工工程研究领域\研究方向学位级别博士学位授予单位南昌大学学位授予日期2001 论文页码总数148页关键词挤出成型聚合物材料挤出口模聚合物异型材馆藏号BSLW /2003 /TQ320 /9 本文建立了求解挤出口模内幂律流体流动速度场的通用三维罚有限元模型；对于非线性粘弹性的Phan Thien-Tanner流体，为了降低模拟计算对计算机硬件的要求，并使模拟计算更加稳定，采用了一种去耦算法，包括罚有限元方法、拟体力方法和动量方程的椭圆类方程转化方法，并建立了求解速度场和粘弹性应力场的总体有限元方程；对于PTT流体的挤出胀大问题，提出了挤出胀大熔体口模内外分离模拟法，这样可以显著降低数值模拟对计算机硬件的要求。

In case of the ship equipped with emergency towing lines, that should be set on ship's fore and/or after part and the end of the lines should be lowered down near to the waterline before abandon ship.

设有应急拖缆的船，在弃船前，应将船上的应急拖缆系固在船头和/或船尾，另一端放置在水线附近。

Kraven the Hunter--Perhaps the most respected big game hunter in the business, Sergei Kravinoff eventually set on a quest to capture the most elusive prey there is - the amazing Spider-Man. After being defeated numerous times by the web-slinger, his quest became an obsession.

Kraven猎手，经营世界上最大的捕猎生意，他的终极猎物就是蜘蛛侠，经过很多的努力，他终于制服了蜘蛛侠后，他却感觉生命已经没有意义了，于是在自杀的同时，放了蜘蛛侠和美国队长我们的CA也被他抓了，晕

Isolation valve or blind plate with "8" type is set on pipeline of flammable gas and liquid at the battery limit of every unit.and operation platform is installed.

可燃气、液管线在装置边界处安装隔离阀或&8&字盲板，并设操作平台，如平台大于8米，需两端设梯。

For access control, it builds a function set on the basis of user's departments, headships and roles.

提出了基于角色权限的权限控制技术，实现了用户多重权限和权限的批量授予。

The owners can be heard telling the dog to "get your tail down"…if the tail is set on right this would not be necessary as the tail follows in a graceful extension of the curve over the hip girdle.

拥有者有时会对狗狗说&把你的尾巴放下来&。。。如果尾巴摆放正确，这个就不需要了，因为尾巴是一个从臀部腰部美丽曲线的延伸。

In order to change this situation,in this dissertation,a kind of auto-tracking measuring system is introduced. The Hore component is set on the tracking mechanical system to detect the magnetic fields movement.

这样，霍尔元件惯性小、非接触的优点将使它在各种位移与振动的测量中发挥作用，成为一种性能优良的位移传感器。

The main focus was set on overseas iron ore mining, the quality of imported ores and their behaviour in the blast furnace.

把主要关注放在海外铁矿石开采、进口矿石的质量以及高炉的性能。

Designed to set on your lap or table and allows you to stitch without holding ...

设计一套对你的圈或表，并允许你缝合而不举行。。。

Setting about at dusk on a hunt, the lionesses are in front

句子意思应该是讲狮群开始狩猎，考查的是&开始做某事&使用哪一个set词组。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。