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Research on development methods and application of CAD system of prac tical sheet metal expansion ;2. A frame expansion method of operator is used to the phase shift operator of split-step Fourier propagator.

针对裂步Fourier传播算子在速度强横向变化介质中的不足，将算子的框架展开方法应用于Fourier传播算子中的相移算子，提出了一种波场传播的局部裂步Fourier传播算子，并把它应用于波动方程叠前深度偏移成像。

Based on the WM-model, the various stages of SPIF process was studied and the forming characters have been realized. Based on the SM-model of the truncated cone, the blank thickness element was sub-meshed into three levels. And through the forming simulation of the process, access to the plate stress and strain of the different regions in forming, and proposed the establishment of a sub-regional mechanism to explain the incremental forming, that is, in different regions, sheet deformation is different. In the main region which reflects the major character of SPIF, the deformation pattern is the composition of bending and extrusion.

基于完整有限元分析模型对渐进成形过程的各阶段进行分析，从而全面认识渐进成形的特点；基于方锥台件局部有限元分析模型，并将板材厚度方向的单元细分为三层，通过成形过程仿真，获取成形中，板材不同区域的应力、应变情况，提出并建立分区域的渐进成形机理解释，即，在不同区域，板材的变形方式是不同的，其中，对体现渐进成形主要特点的方锥台件和圆锥台件的侧壁充分变形区域，其变形方式是拉伸-弯曲复合变形。

The Company through digestion and domestic, Taiwan and foreign compound stabilizer, while the advanced production technology, combined with their own characteristics of a new formula in 1998 into an annual output of 5000 tons, with international advanced level of PVC processing aid package of advanced production line of three ( to environmental protection and low-lead completely separate from the production), production of ZY series compound stabilizer, slip agent, modifier; apply to upper and lower PVC pipes,°profile, blinds sheet, wire and cable, furniture Edge article ...... and other products.

本公司在通过消化国内、台湾和外国复合稳定剂先进生产工艺的同时，结合自已的配方特点再创新，于1998年建成年产5000吨，具有国际领先水平的PVC加工助剂整套先进生产线三条(把环保和低含铅完全分开生产)，生产ZY系列复合稳定剂、滑剂、改性剂；适用于PVC上下水管、扣板异型材、百叶窗薄片、电线电缆、家私封边条……等制品。

The purpose of the study is to reveal the significance of Sushi' writing theories especially the theory of mental peace and blank sheet, which contributed a lot to the modern writing theory and inspires the later people's writing, including the literary and nonliterary works. At the same time, the thesis analyzes Sushi's writing theories systematically and give an objective appraisal of his theories.

研究目的旨在通过&虚静&、&空明&说的阐释和研究，揭示出该写作理论对于我们现代写作理论的丰富和补充，并能对人们的写作活动(包括审美的文学性的写作和普遍的非功利性的写作)起到积极的指导作用，同时也是对苏轼的写作理论进行系统化的研究，并给之以公允、客观的评价。

By studying reservoir rock characteristics, diagenesis and physical property, investigation showed that there were distributary channel, branch channel, mouth bar, distal bar, sand sheet, lakeshore, shallow lake and limestone flat . we concluded that the reservoir of N1～N21 is low porosity and permeability reservoir with the types of primary porosity and secondary intergranular porosity, which is in the early diagenetic stage B into the late diagenetic stage A subperiod. The role of effecting reservoir physical property is deposition, cementation, dissolution and tectonic rupture. After researching of reservoir, we divided it into three categories and division the favorable facies belt and relatively favorable. We think that the favorable facies belt is braided river delta front and partly shallow lake in east of the Fault Ⅶ. favorable reservoir is in the first and the second class.

进一步研究了本区碎屑岩储层的岩石学特征、成岩作用特征、物性特征，研究认为该区储集体类型有分流河道砂体、分支河道砂体、河口坝、远砂坝、席状砂砂体、滨湖砂滩、浅湖砂坝砂体及灰坪；N1层属于低孔、特低渗储层，孔隙类型以原生、次生粒间溶孔为主；分析了影响储层物性的因素主要为沉积作用、胶结作用、溶蚀作用和构造破裂作用；进行了储层评价与有利相带预测，将储层分为三类并划分了有利区带、较有利区带，认为Ⅶ号断层以东的辫状河三角洲前缘亚相和部分浅湖亚相是N1的有利储集相带，储层以Ⅰ、Ⅱ类为主。

In "The Education of a Speculator," he devotes an entire chapter to this notion, comparing the market's movements to some of his favorite pieces of classical music, and juxtaposing pages of sheet music with stock charts.

在《投机者养成教育》中，他用整个章节谈自己的理念，把市场的波动和自己最喜欢的经典音乐对比，把乐谱和股票图形放在一起看。

Specializing in the production of PE, PP, PO, BOPP, PPE, PVC as raw material of plastic packaging bags and PP sheet and so on, such asìü, handbags, clothing bags, vest bags, gift bags, medicine bags, plastic packaging bags, folder chain bag, compound bag, food packaging bags, packaging bags hygiene supplies, electronics, electrical equipment industry, as well as home preservation bag bags, cling film, table cloth and other products such as plastic bags Tianzheng printing plant is located in the known history of China " plastic packaging of villages,"Anhui Tongcheng city, is located in Shanghai-Chengdu, with an high-speed and 206 National Road, or east side of the Kowloon Railway from Anqing airport, the Customs and Excise Department is only 40 kilometers, the highway running through Tongcheng, transportation is very convenient, efficient logistics and transport provide customers with a reliable delivery time.

专业生产以PE、PP、 PO、BOPP、PPE、PVC 为原材料的塑料包装袋以及PP片材等，如手挽袋、手提袋、服装袋、背心袋、礼品袋、医药袋、塑料软包装袋、夹链袋、复合袋、食品包装袋、卫生用品包装袋、电子、电器工业包装袋以及家居保鲜袋、保鲜膜、台布等产品等天正塑料胶袋印刷厂座落于历史上素有的中国&塑料包装之乡&安徽名城桐城市，地处沪蓉、合安高速和206国道，合九铁路东侧，距安庆机场、海关仅40公里，高速公路横贯桐城，交通十分便利，快捷的物流运输为客户提供了可靠的交货时间。

Machine Tool for automatic, manual-type dual purpose, manually type on the basis of automatic but removal the automatic feeding devices and installed the carding device (this device is mainly applied to plants and animals hair) and manual output parts in the same machine tool, the specifications of iron sheet brushes within 2.2 mm ~15mm can be done, the shearing height can be controlled within 13 mm ~ 260mm (suitable for plants and animals hair), automatic feed, 16 gear speed settings, the length of products can be set at will, automatic punching shear, the tolerance can be controlled within ± 0.2mm, with the characteristics of broad applicability, disassembling convenient, flexible, and a multipurpose.

机床为全自动、手动型两用，手动型在自动的基础上拆除自动下毛毛箱装置，安装随机的梳毛装置（此装置主要适用于动植物毛）和手动排毛部件可在同一机床上生产底宽2.2mm～15mm规格的铁皮刷，剪毛高度可自由控制在总高13mm～260mm之间，自动进料，16档速设置，产品长度任意设置，自动冲剪，冲剪长度能保证在±0.2mm以内。具有适用性广、拆装方便、灵活、一机多用的特点。

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。

As a result, the intellectualization of sheet metal forming process is the higher level of new technologies such as press forming automation and flexible process system, by which not only can the feature of manufacturing technique be changed, but also the transformation of press equipment can be forwarded.

所以板材成形智能化过程是冲压成形过程自动化及柔性加工系统等新技术的更高级阶段，不但可以改变冲压生产工艺的面貌，而且还将促进冲压设备的变革，同时也会引起板材成形理论的进步与分析精度的提高，在降低板材级别，消除模具与设备调整的技术难度，缩短调模试模时间，提高成品率和生产率等方面都具有十分明显的意义。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新