降等

The simulation results of the cylinder-block model were given in the article, consistent with that of Middlemen"s. It was shown that the block part could improve the uniformity of the flow distribution. The analysis of the flow field of some materials with different power-law factor in the die designed by Mckelvey was close to that of Mckelvey"s. It was shown that the flow distribution was uniform in the die that can producesheets with 1200mm in width. During the analysis the flow channel was divided into several parts to get the details about the fluid flow in each area. A conclusion was drawn after analyzing the influence of the die pressure on the flow distribution, that the higher pressure is good for the output and bad for the uniformity of the distribution. Simulation of the die applying the cylindrical main runner showed the fact that when the cylinder replaced the cone the change of uniformity was trivial. The uniformity of the non-block flow channel was so poor that the block in the proper position of the die channel was necessary. The project of the die for the wider sheet was put forth, and the analysis of the fluid flow in the die was shown.

本文模拟了圆柱管缝隙流模型的三维流动场，得到了与Middlemen结论一致的流动均匀性，并通过模拟直观地展示了采用阻尼块可以改善挤出均匀性的现象；分析了多种幂率指数的流体在Mckelvey等人设计的流道模型中的流动分布，得到了与Mckelvey的分析结果接近的压力降和流量偏差；本文建立了1200mm幅宽机头流道的三维有限元模型，并逐个分析各个区域和多个截面的流动分布状况，由此揭示了1200mm幅宽L-型机头流道内的流北京化工大学硕士学位论文动分布基本均匀，并在分析了机头压力对于挤出流动分布的影响后得出结论：较高的机头压力可以获得较大的产量，但是不利于物料均匀分布；模拟了采用圆柱管主流道时机头流道内的流动分布，得出结论：主流道由圆锥管改为圆柱管时对流动均匀性影响不大，通过设置适当的阻尼仍然可以达到挤出平衡；模拟了两端进料式圆柱管无阻尼流道的流动均匀性后得到结论：两端进料式无阻尼结构的流动均匀性较差，宽机头中仍然有必要设置阻尼块；确定宽幅机头流道的基本方案，并设计了一种宽幅防水卷材挤出机头流道的结构，通过流动模拟表明该种结构的流动均匀性较好；考察了宽幅机头对于不同厚度片材的挤出适应性，得到结论：当生产不同厚度的片材时，阻尼块高度需要调整。

The result has demonstrated that a kind of X-Pro dipeptidase-like protein which is capable of hydrolyzing G-type organophosphate exists in Arabidopsis thaliana, but no enzyme which can degrade OPs such as methamidophos exists.

结果表明，拟南芥中存在可降解G类有机磷的氨酰基脯氨酸二肽酶的类似蛋白，未发现存在可降解甲胺磷等有机磷农药的酶类。

There are many small neurons that contain neuropeptides including SP and CGRP in dorsal root ganglions.

腰椎背根神经节的小细胞中有多种神经肽，包括P物质(SubstanceP，SP)和降钙素基因相关肽(calcitoningene-relatedpeptide，CGRP)等。

The permeable cement system is mainly used in oil and gas wells for sand control and water plugging.

以微细水泥、石英砂为基本材料，增渗剂A、分散剂SXY和降失水剂HS 2A等为外加剂，配制出了一种适合油气井防砂、堵水的渗透性水泥浆。

When gating directly onto a thin wall with a sprue gate, pin point gate, or hot drop, etc., gate wells should be used to help reduce stress at the gate, aid in filling, and minimize part damage when degating.

薄壳技术 Thin-wall Technology Thin经由浇道浇口，针点浇口，二次热浇道浇口等直接进浇到薄壁，应使用浇口井，以减少浇口应力，帮助充填，并将制品在去浇口时的损毁降到最低。

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It was very exciting at that season to roam the then boundless chestnut woods of Lincoln —— they now sleep their long sleep under the railroad —— with a bag on my shoulder, and a stick to open burs with in my hand, for I did not always wait for the frost, amid the rustling of leaves and the loud reproofs of the red squirrels and the jays, whose half-consumed nuts I sometimes stole, for the burs which they had selected were sure to contain sound ones.

这样的季节里，倘徜在林肯一带无边无际的栗树林中，真是非常兴奋的，——现在，这些栗树却长眠在铁道之下了，——那时我肩上扛了一只布囊，手中提了一根棍棒来打开那些有芒刺的果子，因为我总是等不到霜降的，在枯叶飒飒声和赤松鼠跟樫鸟聒噪责怪声中漫游，有时我还偷窃它们已经吃了一部分的坚果，因为它们所选中的有芒刺的果子中间，一定有一些是较好的。

Newly-issued bank loans increase has been lowered to the level before 2002, iron and steel and cement industries in the substantially reduced amount of investment.

新发行的银行贷款增长已降至2002年之前的水平，钢铁和水泥等行业的大幅减少投资金额。

Effect of calcitonin gene-related peptide in patient with delayed postoperabbitive cerebral ischaemia after aneurysmal subarachnoid haemorrhage.

剑飞，等。脑梗塞患者血浆内皮素和降钙素基因相关肽含量变化及其临床意义。

It has the mouthfeel of tea and medical function, constant drinkable can adjust kidney function, hemal to heart head disease, rheumatism, kind rheumatism has better precautionary effect, have resist high blood pressure, relieve a cough, make expectoration easy, fall yellow ketone alcohol is the fat, Shuang Qing that defends the action such as liver place of wild berry tea is particular.

功效 它具备茶的口感和药功能，常饮用能调节肾功能，对心脑血管疾病。风湿。类风湿有较好的预防作用，具有抗高血压。止咳。祛痰。降脂。保肝等作用的双氢黄酮醇为野莓茶所独有。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。