不动性

Firstly, the establishment of model requires sophisticated neurointerventional techniques and costly interventional materials(sacculus, minikin circlip ring, endovascular electrocoagulation), it not only consumed time but also increased the resesrch expense ; Secondly, although the Massoud model is the first successful model that contain the nidus, but it is far from mimicking the high-flow fistulae frequently observed in a brain AVM; Thirdly, the rapid spontaneous thrombosis result in fistula occlusion in a short time;Fouthly, the model's natural course and the long–term patency of fistula are unclear;Currently the model is only used for the short-term research.

但Massoud模型目前存在以下主要缺点：第一，模型的建立需要复杂的神经介入技术和昂贵的介入材料(球囊、微弹簧圈、血管内电凝等)，操作费时，又大大增加了研究费用；第二，Massoud模型虽然首次具备了畸形血管团，但它远不是我们临床上常见的含有高流量动静脉瘘的脑AVM；第三，颈动静脉吻合口自发性血栓形成进而导致引流静脉闭塞的机率很高；第四，Massoud模型的长期自然过程和动静脉吻合口的长期通畅性尚不清楚，目前仅仅作为急性期模型。

Peripherin-kizami effect of holography: adoption of the photoetching machine computer programming walk-by-bit imaging technology and identifies the surface brightness, along with the change of the perspective that identifies the patterns occur within the rules of a beautiful animation, plus a hierarchical pattern can be a strong level of icing on the cake and more graphics and text content, the user thereby to protect their products from others phishing as well as the purpose of improving the products concerned and show their uniqueness and uniqueness, thus increasing the added value of coplasticizer products and enhancing brand image.

动感光刻成果激光全息：堵住光刻机电脑编程行位办理技艺成像，标志暗地亮度极佳，随着视角的保持，标志边的图案会呈不隐法规而标致的不静态成果，加上图案的不合层办理，更可获得很不弱的条理立体感和较众的图文边容，用户由此到达爱护自己的产物免遭他人仿冒的纲的，既能提矮产物档次，又表不隐其单共性和惟一性，从而补充日化产物的附加值和晋升品牌不隐象。

Taken example for solving real engineering problem, the methods and steps for the analysis of the steering-wheel vibration is discussed.

为了解决某型轿车的转向盘振动问题，本文通过对影响转向盘振动的诸多因素逐一进行分析，结合先进的试验手段和CAE分析技术，找出了引发该轿车转向盘振动的主要原因是车轮动平衡质量不合格及固定转向柱管的仪表板横梁刚度不足，通过提高车轮动平衡质量，改进仪表板横梁设计，提高仪表板横梁的刚度和固有振动频率，结合道路试验进行主观评价，改进后的转向盘振动达到了平顺性要求。

In chapter Ⅰ, a historial review of structure control is given; In chapter Ⅱ, A discussion of the controllability and observablity of flexible structures is given, Two kinds of controllability and observablity index are defined, and applied to actuator allocation; chapter Ⅲ considers the reduction of high order flexible structure mode; the content of chapter Ⅳ is about the basic problem of distributed parameter control system design. It is proved that a stable controllor in mode space may be unstable in real use in distributed paramater systems, also, by closed loop mode concept, a pole assignment method of flexible structure controllor design is given; chapter Ⅴ is about the low-authority controllor design, it is pointed out by use of high order eigenvalue/eigenvector perturbation, a better controllor can be designed; chapter Ⅳ considers flexible structure reduced order control; chapter Ⅶ disscusses the basic problem of flexible structure computer control, analyses discreate controllablity and observablity and its computing, the sample period and coefficient wordlength; chapter Ⅷ is on the problem of low flexibility compensation; chapter Ⅸ is a design example.

在第一章简要回顾了挠性结构控制的历史，并且指出控制中的一些问题；第二章讨论了挠性结构的能控性与能观性，定义了两类能控性程度和能观性程度指标，还将能控性程度概念应用于执行器位置的确定；第三章论述了高阶模型的降价问题，比较了适于挠性结构模型降阶的方法，指出其适用范围；第四章内容是分布参数系统设计的基本问题，首先证明在模态空间中设计的稳定的控制器在实际分布系统上可能是不稳定的，进而根据闭环模态的概念，获得挠性结构控制器设计的极点配置方法；第五章的内容是关于低权控制器的设计问题，指出利用特征值高价摄动和特征向量的摄动，可以设计出更加完善的低权控制器；第六章讨论挠性结构降阶控制问题；第七章讨论挠性结构计算机控制的基本问题，分析了时间离散化模型的能控性和能观性及其计算问题，讨论了采样周期选择和系数字长问题；第八章讨论低挠性结构的补偿问题；第九章的设计例子用来说明第二章和第四章的结果。

In the CMYK color business card printing and membership card, printing is accurate is color business card printing and membership card produced at the basic requirements of the stability of the machine, the business card printing in terms of raw materials and membership card making suitable to their needs, workshop of temperature and humidity, etc. all may lead to misregister, even if the other great business card printing and membership card production during the two-color swatches of the still of the possibility of a slight deviation disnature overprinter, resulting in different colors or leakage at the junction of overprint text color, border color, and now make up for the open field this deficiency is in color while the trapping.

在CMYK四色制卡和会员卡制息洋，套印不确是不黑白制卡和会员卡制息最根基的给求，机械的稳定性、原辅质料的制卡和会员卡制息适性、车间温干量等都有不定引起套印禁绝，即使各方背后提都很好，制卡和会员卡制息历程洋进动套色的两个色块之间仍有不定会爆发惨重的错位而爆发套印不正差，抽象外此刻差别颜色的交界处漏白或叠印颜色边口不齐、露色，此刻填充这种弊端的办法不离是在不合色时进动陷印办理。

The category is designed to include a group of children with severe mental retardation (IQ below 50) who show major problems in hyperactivity and in attention, as well as stereotyped behaviours. They tend not to benefit from stimulant drugs (unlike those with an IQ in the normal range) and may exhibit a severe dysphoric reaction (sometimes with psychomotor retardation) when given stimulants. In adolescence, the overactivity tends to be replaced by underactivity (a pattern that is not usual in hyperkinetic children with normal intelligence). This syndrome is also often associated with a variety of developmental delays, either specific or global.

因有下述特徵则作此诊断：出现注意力不集中及过动行为的重度智能不足（智商低於 50 ）；给予兴奋性药物治疗并不能改善此类儿童的情况，反而可能会有情绪低落反应在少年期少动行为常取代过动行为（这种情况在正常智商的过动儿童并不常见），同时常并发特定或全面的发展迟滞。

Immunohistochemically, cells in myoid/myofibroblastic areas showed positive staining for α-SMA, MSA and vimentin, but negative for desmin and CD34. Electron microscopic study displayed the presence of microfilament bundles, focal dense bodies and micropinocytic vesicles, consistent with those of myofibroblasts.

免疫组织化学标记显示肌样区域细胞表达α-平滑肌肌动蛋白和肌特异性肌动抗原，不表达CD34；电镜观察证实细胞含有质膜下微丝束、局灶性致密体及微胞饮囊泡样结构，与肌纤维母细胞相一致。

Test result shows that ship speed regulator enhances the ability to restrain disturbance and system with parameter perturbance and improves the stability and speed performance in case of system uncertainty.

仿真结果表明，新的船舶柴油机调速器在系统模型不确定和参数摄动情况下，能在线学习被控系统的动态特性，具有抑制扰动和参数摄动的能力，系统调节过程的稳定性和快速性都有提高。

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。

However, in contrast with the intransitive verb in western languages,....

但不同于西方语法中的不及物动词，日语自动词具有独特的语义特征，即自动词能够与ヲ格呼应、自动词本身能够表达可能含义、被动含义、自动词具有被动式结构以及自动词使役态的他动性含义等。

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。