不同地

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。

Based on the presence of the two kinds of different basic modes that are being/have formed in the development of these two clan folksong-the keeping mode and the changing one, the dissertation intends to find out the origin of the generation of these two modes veiled behind its music form, to master the characteristics of different folk music deeply, and make some preliminary interpretation about the development of these two clan folksong.

在揭示两族民歌发展变化所形成的两种不同基本模式——保持型模式与变化型模式的基础上，力图发掘其音乐形态背后的内在成因，籍以深入地把握不同民族音乐的自身特征，并对两族民歌发展的过程作出初步阐释。

Moreover, the aboveground biomass, underground biomass and total biomass of Elymus nutans Grise and Poa crymophila Keng descended with altitudes ascended, and that the biomass of the former species was higher than the latter.

垂穗披碱草和冷地早熟禾地上、地下生物量沿海拔高度的升高而降低，且前者生物量大于后者；两者的植株高度和根系长度随海拔不同而不同，都在3400m处最大，前者大于后者。

Modular self-reconfigurable robots consist of large numbers of identical modules that possess the ability to reconfigure into different shapes such as snake or hexapods as required by the task.

模块化自重组机器人由大量结构、功能都相同的模块组成，它可以根据环境或任务的不同将模块重新组合形成不同的构形，例如蛇形、履带形或昆虫形等，可以很好的满足救火、地震后的城市搜救和战地侦察等不确定性环境中的多任务要求。

Section 3 is the difficult and key part of the whole paper, focus on discussing how to improve our country"s unemployment insurance system .specific countermeasures to improve the system are presented as follows: constituting unemployment insurance law establishing and amplifying safe -guard system of the law; establishing that judies is the first in the level of value; definite unemployment and the qualification of gaining unemployment insurance, reasonably enlarging the scopes of insurance; intensifying and promoting the function of reemployment to realize the combination of unemployment insurance and reemployment promotion; enforcing raising insurance fund and fully exerting the fund"s use benefit ;improving its systems of management and supervision to realize scientific management, keeping the fund safety and development..

本文认为我国的失业保险制度应在根据我国国情的基础上，在以下几个方面完善失业保险法律制度：制定《失业保险法》，提高失业保险制度的法律效力，并辅之以其他相关法律法规相配套，建立起一个层次分明相互协调的综合性失业保险法律体系；确立以公平为优先的立法价值取向，在法律的层次上明确失业保险制度作为超越经济领域的公共产品应当以社会公平为其立法的价值取向；正确界定失业的定义及失业保险资格条件，在符合中国国情的情况下，合理扩大失业保险的覆盖面；确立以保障劳动者的基本生活和促进再就业为失业保险法律制度的立法宗旨，加强失业保险的再就业促进功能，变消极支付失业保险金作法为积极地促进再就业，认识到&就业是最好的保障&；完善失业保险费征缴制度，按不同行业、企业的失业风险概率不同，实行差别缴费率，加强失业保险费征缴的法律力度，提高劳动者和用人单位的缴费积极性；完善失业保险待遇给付制度，从确保失业者的基本生活需要和促进其再就业的角度出发，完善给付水平和给付期限的规定；规范和完善失业保险的管理和监督制度，实现管理科学化，保证并实现保险墓金的保值、增值。结语部分，对全文进行总结。

Studies on compensationary growth of invasive plants, which are subjected to different intensities of leaf-eating, in different levels of soil fertility are very important for us to determine the suitable density of its natural enemy population.

研究不同土壤肥力条件下入侵植物的叶片被不同强度地取食后所表现出的补偿性生长将有助于确定适宜的天敌投放密度。

As the development of the female figures in Ding lings novels, we can not only know something about the spiritual journey of her, but also comprehend deeply the strong woman consciousness. And the essay will probe into the social realistic significance in her different literary creation periods.

随着作品中女性人物形象的不断演变和发展，我们不仅可以了解到丁玲的人生心路历程，还可以深切地领会到其创作中强烈的女性意识的历变，从而揭示她不同创作阶段的不同创作的现实意义。

According to the data of drill cores,outcrops and well loggings,two orders base-level cycles are recognized from Zhiluo Formation in Dongsheng area,which consist of 8～14 short-term base-level cycles and 3 mid-term base-level cycles , and their structural types and stacking patterns are discussed by using principles and methods of high-resolution sequence stratigraphic theory.

文章综合利用岩心、露头、测井资料，运用高分辨率层序地层学基本理论和方法，对东胜地区直罗组地层进行不同级次基准面旋回的层序划分，共识别出8~14个短期旋回、3个中期旋回，并对不同级次基准面旋回的结构类型、叠加样式进行探讨。

The many-faceted development of society makes us understanding Marx in a new perspective. Marxism theory has different meaning and value in different periods of history.

社会多元化的发展需要我们不断地重新解读马克思，马克思主义哲学在不同时代应具有不同的意义和价值。

With the aid of the (Charge- Coupled Device) CCD camera to acquire the digital informations for erect section of specimens, then utilizing the compacting parameters of compaction particle principal axis direction , asphalt mastics film thickness and particle area ratio etc.

针对沥青混合料试件压实成型方式不同因而内部结构各异的情况，采用图像数字处理技术，借助于CCD相机获取试件立断面的数字化信息，提出利用颗粒主轴方向、沥青砂胶膜厚及颗粒面积比等压实参数，直观、快速而准确地评价不同成型方法的压实效果，在此基础上，选择了马歇尔击实、轮碾压实、振动压实和旋转压实四种方法进行研究，并对比分析了实际路面结构。

Recall that, in the Kolmogorov axiomatization, measurable sets are the sets which have a probability or, in other words, the sets corresponding to yes/no questions that have a probabilistic answer.

延期开工的Kolmogorov宣布要衡量所有套职能有限许多坐标限制在于衡量子寅。换句话说，如果是/否的问题回答f可看的价值观念在许多最有限坐标，然后它有一个概率的答案。

The experimental results showed that the algorithm can filter singular points and remain fixity of the target edge.

实验表明：基于模糊理论的图像智能滤波方法比常规图像滤波方法运算量小，它既能去除奇异点，又能保持图像中目标的边缘不变性，具有很好的滤波效果。