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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。

Yueqing one industry source, as far as he knew, Qiligang area there are at least more than 10 vessels shipping goods sold, and some half-made ship, unable to continue production, can only be stopped at the side of the low value of the tens of millions of dollars, the high - on billion.

乐清一业内人士透露，据他所知，七里港一带至少有10多艘商品船卖不出去，部分船造到一半，无法继续生产，只能停在那边，价值低则数千万元，高则上亿元。

Iconically, there is direct association between utterance politeness and social distance, so the degree of utterance politeness is relatively high on scales with increase of social distance and linguistic signs from the static view of linguistic form.

话语礼貌与社会距离存在象似关系，社会距离增大，语符增多，话语礼貌程度相对较高，但这只是不考虑语境生成的作用，静止地从语言形式本身来判断礼貌的程度，因而在语言的具体使用过程中，要动态地考虑交际生成语境。

High on Wi-Fi The future of this megacity is definitely wireless if trends in new technology are analysed.

高月的Wi-Fi未来这绝对是大城市如无线通讯新技术发展趋势作出分析。

As she emerges from her mud-walled house carried high on her elder brother's shoulder two-year-old Rabia is blissfully unaware of the life that awaits her.

两岁的巴基斯坦女孩拉比耶看起来是那样的天真无邪、充满稚气，她还不知道，她叔父所犯下的错误却要用她一生的幸福作为代价来偿还。

Innova, made by Natura Pet Products, has to score high on any list of cat foods.

凌采露华的产品，在任何猫粮产品的标杆。

A small number intended to make real trouble; the rest were there to stage various forms of peaceful protest, including the Yippies, who planned a countercultural Festival of Life with most of the celebrants high on marijuana, and the National Mobilization Committee, which had a more conventional protest in mind.

一小部分人打算真正闹出个大事；另一些人则在那里上演各种形式的和平抗议，包括雅皮士们，他们计划搞一个反文化的庆祝生命的活动，大部分参加活动的人都因吸食大麻而亢奋。此外还有全国动员委员会，他们所计划的抗议形式则较为传统。

Primates with the stoutest figures also ranked high on both aggression measurements.

灵长类动物与stoutest数字还高排名均侵略测量。

Fisk also tested the men for levels of sexism and found a surprising effect those who scored high on this test,...the hostile sexists were likely to deactivate the part of the brain that thinks about other people's intentions.

Fiske 还测试了这些男人性别歧视的级别，发现一个令人惊讶的效应，就是那些级别高的人……这些有敌意的性别主义者倾向于减弱大脑某些区域的活动，这些区域和人们想起他人时的冲动有关。

Fiske also tested the men for levels of sexism and found a surprising effect those who scored high on this test,...the hostile sexists were likely to deactivate the part of the brain that thinks about other people's intentions.

没太看明白&就是那些级别高的人&……这些有敌意的性别主义者倾向于减弱大脑某些区域的活动，这些区域和人们想起他人时的冲动有关。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。