射频识别技术手册(第二版) 外文翻译
毕业论文(设计)
文献翻译
本翻译源自于：RFID Handbook (Second Edition)
毕业设计名称：电力系统高速数据采集系统设计外文翻译名称：射频识别技术手册（第二版）
学生姓名：翁学娇
院(系)：电子信息学院
专业班级：电气10803
指导教师：唐桃波
辅导教师：唐桃波
时间：2012年2月至2012年6月
射频识别技术手册：基于非接触式智能卡和识别的原理和应用 第二版
Klaus Finkenzeller
版权 2003 John Wiley& Sons 有限公司
国际标准图书编号:0-470-84402-7
5.频率范围和无线电许可条例
5.1 频率范围
因为射频识别系统产生和辐射电磁波，他们已被列为合法的无线电系统。其他功能的无线服务在任何情况下都不能受到射频识别操作系统的干扰和损害。尤其重要的是要确保RFID 系统不会干扰附近的广播和电视，移动无线电服务（警察、保安服务、工业），航海和航空无线电服务和移动电话。
对射频识别系统来讲，运动保健方面需要的其他无线电服务明显制约了适宜范围内的可操作频（图 5.1）.出于这个原因，它通常是唯一可以使用的频率范围，已经有人预定了专供工业，科学和医学中的应用。这些世界范围内的频率划分成国际频率范围（工业-科学-医学），它们也可以用于射频识别应用。 实际可用的射频频率
f ：图5.1 用于射频识别系统范围内的频率范围为135千赫一下的超长范围通过短波以及超短波到微波范围，包括最高频率24千兆赫。在上述的135千赫的范围内，可用的ISM 频段是全球首选。
：
图5.2 百万应答机单元中的不同频率范围的转发器的全球市场估计分布
除了ISM 频率，整个频率范围内低于135千赫（在北美、南美和日本：低于400千赫）也是可用的，因为在这个范围内，它是可能与高磁场的优势联合工作的，特别是操作时电感耦合的射频识别系统。
对射频识别系统来说最重要的频率范围是0-135千赫，ISM 的是6.78左右（在德国不适用），13.56兆赫,27.125兆赫,40.68兆赫,433.92兆赫,869.0兆赫,915.0兆赫(不是在欧洲),2.45兆赫,5.8兆赫和24.125兆赫。
各种不同射频转发器频率的概述估计分布如图5.2所示。
5.1.1 频率范围9-135千赫
低于135千赫范围的频率被其他无线服务大量使用，因为它没有被保留为ISM 频率范围。在长波频率范围内的传播允许无线服务系统不断地以较低的技术成本占据这个半径为1000千米以上的区域。在这个范围内的典型的无线电服务是航空和航海无线电导航服务（LORAN C,OMEGA,DECCA ）,时间信号服务，标准频率服务再加上军用无线电服务。因此，在欧洲中部时间信号发射机DFC 的77 Mainflingen 可以在频率 77.5 千赫左右被发现。因此在这个频率的射频识别系
统的运行会导致读者周围几百米半径内的所有无线电时钟故障。
为了防止这样的冲突，在欧洲未来的感应式无线电系统许可法中，中控锁122到220将会被限定在一个保护区域70到119千赫，这将不再被分配到射频识别系统。
德国无线电服务获得的可操作的频率范围（来源：BAPT 1997）如表5.1所示。
表5.1 频率范围为9-135千赫的德国无线电服务，实际占用的频率，尤其是在频率段119-135千赫这个范围内已经急剧下降。例如，德国天气服务局（DWD）早在1996年年中就把天气的无线传播改为134.2千赫。
f(KHz) Class Location Call
16.4 FX Mainflingen DMA
18.5 FX Burlage DHO35
23.4 FX Mainflingen DMB
28.0 FC Burlage DHO36
36.0 FC Burlage DHO37
46.2 FX Mainflingen DCF46
47.4 FC Cuxhafen DHJ54
53.0 FX Mainflingen DCF53
55.2 FX Mainflingen DCF55
69.7 FX K¨onigswusterhausen DKQ
71.4 AL Coburg —
74.5 FX K¨onigswusterhausen DKQ2
77.5 Time Mainflingen DCF77
85.7 AL Brilon —
87.3 FX Bonn DEA
87.6 FX Mainflingen DCF87
94.5 FX K¨onigswusterhausen DKQ3
97.1 FX Mainflingen DCF97
99.7 FX K¨onigswusterhausen DIU
100.0 NL Westerland —
103.4 FX Mainflingen DCF23
105.0 FX K¨onigswusterhausen DKQ4
106.2 FX Mainflingen DCF26
110.5 FX Bad Vilbel DCF30
114.3 AL Stadtkyll —
117.4 FX Mainflingen DCF37
117.5 FX K¨onigswusterhausen DKQ5
122.5 DGPS Mainflingen DCF42
125.0 FX Mainflingen DCF45
126.7 AL Portens, LORAN-C, coastal navigation —128.6 AL Zeven, DECCA, coastal navigation —129.1 FX Mainflingen, EVU remote control transmitter DCF49 131.0 FC Kiel (military) DHJ57
131.4 FX Kiel (military) DHJ57
缩写：AL：航空无线电导航服务，FC：航海移动无线电服务，FX：固定航空无线电服务，MS：航海移动无线电服务，NL：航海无线电导航服务，DGPS：差分全球定位系统（校正数据），Time：“电波钟表”时间信号发射器。
线装载波系统的工作频率为100千赫，115千赫和130千赫。这些包括，例如，对讲系统利用220V主电源作为传输介质。
5.1.2 频率范围
6.78兆赫
频率范围在6.765-6.795兆赫的属于短波频率。这个范围内的传播条件在白天只允许短距离高达数100公里。在夜间时段，横贯大陆的传播是可能的。这个频率范围由无线电服务广泛使用，例如广播，天气，航空无线电服务以及新闻机构。
作为一个在德国的ISM范围，此范围尚未获得通过，但已经被指定为国际电联的ISM频段并正在被射频识别系统（法国，其他国家之间）大量使用。在CEPT/ERC 70-03原则中，CEPT/ERC指定此范围为统一频率（见5.2.1节）。
5.1.3 频率范围13.56兆赫
范围为13.553-13.567兆赫的频率位于短波范围的中间段。这个频率范围内的传播条件允许整天的洲际连接，它被各种各样的无线服务（Siebel，1983）使用，例如新闻机构和电信（PPT）的。
其他ISM应用在这个频率范围内的操作，除了感性无线电系统（RFID），还有远程控制系统，遥控模型，示范无线电设备和传呼机。
5.1.4频率范围27.125兆赫
范围为26.565-27.405的频率被分配到整个欧洲大陆以及美国和加拿大的CB无线。发射功率高达4瓦特的注销的和非充电式无线电系统允许私人参与者之间的无线电通信距离可高达30公里。
位于26.957和27.283兆赫之间的ISM范围大约在CB无线电范围的中间，除了感应式无线电系统，在这个范围内运行的ISM应用还包括透热设备（医疗应用），高频焊接设备（工业应用），遥控模型和传呼机。
当安装27兆赫的工业应用的射频识别系统时，对任何可能位于高频焊接设备附近的应给予特别注意。高频焊接设备产生的高场强可能会干扰同频率附近的射频识别系统的操作。当规划医院的27兆赫射频识别系统（如门禁系统），审议时应考虑到任何可能存在的透热设备。
5.1.5频率范围40.680兆赫
范围为40.660-40.700兆赫的频率位于VHF范围的低端。波的传播受限于地面波，所以由建筑物和其他障碍物产生的阻尼不太明显。毗连这ISM范围的频率被移动商业无线电系统（林业，高速公路管理）和电视广播（VHF范围I）占用。
在此范围内经营的主要ISM应用是遥测（测量数据的传输）和远程控制应用。作者知道在此范围内没有射频识别系统的应用，这可以归因于在这个频率范围内不适合这种类型的系统。在此范围内可与电感耦合实现的范围比那些可以在较低频率实现的范围要显著降低，而在范围波长为7.5米的是不适合兴建小型和廉价的后向散射转发器。
5.1.6频率范围433.920兆赫
范围为430.000-440.000兆赫的频率被分配为世界各地的业余无线电服务。业余无线电爱好者将此范围用于语音和数据传输，并通过无线电中转站或者自制的太空卫星进行通信。
在这个UHF频率范围内的波的传播大约是光学波。当遇到建筑物和其他障碍物时会产生过阻尼以及输入的电磁波的反射。
根据操作方法和发射功率的不同，业余爱好者使用的系统在30到300公里的距离。全球连接也可能利用空间卫星。
ISM范围为433.050-434.790兆赫的频率大约位于业余无线电波段的中间并被广泛的ISM应用严重占用。此外散射（RFID）系统，婴儿对讲机，遥测发射机（包括那些国内的应用，如无线外部温度计），无线耳机，短距离的未注册的LPD对讲机，无钥匙进入系统（汽车中央门锁手持发射机）和许多其他应用被塞进这个频率范围。不幸的是，在这个频率范围内广泛地ISM应用之间的相互干扰的情况并不少见。
5.1.7 频率范围869.0兆赫
在1997年底，范围为868-870兆赫的频率在欧洲通过了短距离设备（SRDs），因此在化学强化一级的43个成员国中可供射频识别应用。
一些远东国家也正在考虑这个频率范围内传递的SRD。
5.1.8频率范围915.0兆赫
这个频率范围并不适用于欧洲ISM应用。欧洲以外（美国和澳大利亚）在频率范围888-889兆赫和902-928兆赫是可用的，并被散射技术(RFID)系统使用。
邻近的频率范围主要被D型网电话和CT1+和CT2标准的无绳电话占用。
5.1.9频率范围2.45吉赫
模具毕业设计外文翻译(英文+译文)
Injection Molding The basic concept of injection molding revolves around the ability of a thermoplastic material to be softened by heat and to harden when cooled .In most operations ,granular material (the plastic resin) is fed into one end of the cylinder (usually through a feeding device known as a hopper ),heated, and softened(plasticized or plasticized),forced out the other end of the cylinder, while it is still in the form of a melt, through a nozzle into a relatively cool mold held closed under pressure.Here,the melt cools and hardens until fully set-up. The mold is then opened, the piece ejected, and the sequence repeated. Thus, the significant elements of an injection molding machine become: 1) the way in which the melt is plasticized (softened) and forced into the mold (called the injection unit); 2) the system for opening the mold and closing it under pressure (called the clamping unit);3) the type of mold used;4) the machine controls. The part of an injection-molding machine, which converts a plastic material from a sold phase to homogeneous seni-liguid phase by raising its temperature .This unit maintains the material at a present temperature and force it through the injection unit nozzle into a mold .The plunger is a combination of the injection and plasticizing device in which a heating chamber is mounted between the plunger and mold. This chamber heats the plastic material by conduction .The plunger, on each stroke; pushes unbelted plastic material into the chamber, which in turn forces plastic melt at the front of the chamber out through the nozzle The part of an injection molding machine in which the mold is mounted, and which provides the motion and force to open and close the mold and to hold the mold close with force during injection .This unit can also provide other features necessary for the effective functioning of the molding operation .Moving
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毕业设计外文翻译原文.
Optimum blank design of an automobile sub-frame Jong-Yop Kim a ,Naksoo Kim a,*,Man-Sung Huh b a Department of Mechanical Engineering,Sogang University,Shinsu-dong 1,Mapo-ku,Seoul 121-742,South Korea b Hwa-shin Corporation,Young-chun,Kyung-buk,770-140,South Korea Received 17July 1998 Abstract A roll-back method is proposed to predict the optimum initial blank shape in the sheet metal forming process.The method takes the difference between the ?nal deformed shape and the target contour shape into account.Based on the method,a computer program composed of a blank design module,an FE-analysis program and a mesh generation module is developed.The roll-back method is applied to the drawing of a square cup with the ˉange of uniform size around its periphery,to con?rm its validity.Good agreement is recognized between the numerical results and the published results for initial blank shape and thickness strain distribution.The optimum blank shapes for two parts of an automobile sub-frame are designed.Both the thickness distribution and the level of punch load are improved with the designed blank.Also,the method is applied to design the weld line in a tailor-welded blank.It is concluded that the roll-back method is an effective and convenient method for an optimum blank shape design.#2000Elsevier Science S.A.All rights reserved. Keywords:Blank design;Sheet metal forming;Finite element method;Roll-back method
模具毕业设计外文翻译7081204
(此文档为word格式，下载后您可任意编辑修改！) 冷冲模具使用寿命的影响及对策 冲压模具概述 冲压模具--在冷冲压加工中，将材料(金属或非金属)加工成零件(或半成品)的一种特殊工艺装备，称为冷冲压模具(俗称冷冲模)。冲压--是在室温下，利用安装在压力机上的模具对材料施加压力，使其产生分离或塑性变形，从而获得所需零件的一种压力加工方法。 冲压模具的形式很多，一般可按以下几个主要特征分类： 1?根据工艺性质分类 (1)冲裁模沿封闭或敞开的轮廓线使材料产生分离的模具。如落料模、冲孔模、切断模、切口模、切边模、剖切模等。 (2)弯曲模使板料毛坯或其他坯料沿着直线(弯曲线)产生弯曲变形，从而获得一定角度和形状的工件的模具。 (3)拉深模是把板料毛坯制成开口空心件，或使空心件进一步改变形状和尺寸的模具。 (4)成形模是将毛坯或半成品工件按图凸、凹模的形状直接复制成形，而材料本身仅产生局部塑性变形的模具。如胀形模、缩口模、扩口模、起伏成形模、翻边模、整形模等。2?根据工序组合程度分类 (1)单工序模在压力机的一次行程中，只完成一道冲压工序的模具。 (2)复合模只有一个工位，在压力机的一次行程中，在同一工位上同时完成两道或两道以上冲压工序的模具。 (3)级进模(也称连续模) 在毛坯的送进方向上，具有两个或更多的工位，在压力机的一次行程中，在不同的工位上逐次完成两道或两道以上冲压工序的模具。 冲冷冲模全称为冷冲压模具。 冷冲压模具是一种应用于模具行业冷冲压模具及其配件所需高性能结构陶瓷材料的制备方法，高性能陶瓷模具及其配件材料由氧化锆、氧化钇粉中加铝、错元素构成，制备工艺是将氧化锆溶液、氧化钇溶液、氧化错溶液、氧化铝溶液按一定比例混合配成母液，滴入碳酸氢铵，采用共沉淀方法合成模具及其配件陶瓷材料所需的原材料，反应生成的沉淀经滤水、干燥，煅烧得到高性能陶瓷模具及其配件材料超微粉，再经过成型、烧结、精加工，便得到高性能陶瓷模具及其配件材料。本发明的优点是本发明制成的冷冲压模具及其配件使用寿命长，在冲压过程中未出现模具及其配件与冲压件产生粘结现象，冲压件表面光滑、无毛刺，完全可以替代传统高速钢、钨钢材料。 冷冲模具主要零件冷冲模具是冲压加工的主要工艺装备，冲压制件就是靠上、下模具的相对运动来完成的。 加工时由于上、下模具之间不断地分合，如果操作工人的手指不断进入或停留在模具闭合区，便会对其人身安全带来严重威胁。 1
中国的对外贸易外文翻译及原文
外文翻译 原文 Foreign T rade o f China Material Source:W anfang Database Author:Hitomi Iizaka 1.Introduction On December11,2001,China officially joined the World T rade Organization(WTO)and be c a me its143rd member.China’s presence in the worl d economy will continue to grow and deepen.The foreign trade sector plays an important andmultifaceted role in China’s economic development.At the same time, China’s expanded role in the world economy is beneficial t o all its trading partners. Regions that trade with China benefit from cheaper and mor e varieties of imported consumer goods,raw materials and intermediate products.China is also a large and growing export market.While the entry of any major trading nation in the global trading system can create a process of adjustment,the o u t c o me is fundamentally a win-win situation.In this p aper we would like t o provide a survey of the various institutions,laws and characteristics of China’s trade.Among some of the findings, we can highlight thefollowing: ?In2001,total trade to gross domestic pr oduct(GDP)ratio in China is44% ?In2001,47%of Chinese trade is processed trade1 ?In2001,51%of Chinese trade is conduct ed by foreign firms in China2 ?In2001,36%of Chinese exports originate from Gu an gdon g province ?In2001,39%of China’s exports go through Hong Kong to be re-exported elsewhere 2.Evolution of China’s Trade Regime Equally remarkable are the changes in the commodity composition of China’s exports and imports.Table2a shows China’s annu al export volumes of primary goods and manufactured goods over time.In1980,primary goods accounted for 50.3%of China’s exports and manufactured goods accounted for49.7%.Although the share of primary good declines slightly during the first half of1980’s,it remains at50.6%in1985.Since then,exports of manufactured goods have grown at a much
模具专业外文文献最新
济南大学泉城学院 毕业设计外文资料翻译 题目现代快速经济制造模具技术 专业机械制造及其自动化 班级专升本1302班 学生刘计良 学号2013040156 指导教师刘彦 二〇一五年三月十六日
Int J Adv Manuf Technol ,(2011) 53:1–10DOI 10.1007/s00170-010-2796-y Modular design applied to beverage-container injection molds Ming-Shyan Huang & Ming-Kai Hsu Received: 16 March 2010 / Accepted: 15 June 2010 / Published online: 25 June 2010 # Springer-Verlag London Limited 2010 Modular design applied to beverage-container injection molds The Abstract: This work applies modular design concepts to designating beverage-container injection molds. This study aims to develop a method of controlling costs and time in relation to mold development, and also to improve product design. This investigation comprises two parts: functional-ity coding, and establishing a standard operation procedure, specifically designed for beverage-container injection mold design and manufacturing. First, the injection mold is divided into several modules, each with a specific function. Each module is further divided into several structural units possessing sub-function or sub-sub-function. Next, dimen-sions and specifications of each unit are standardized and a compatible interface is constructed linking relevant units. This work employs a cup-shaped beverage container to experimentally assess the performance of the modular design approach. The experimental results indicate that the modular design approach to manufacturing injection molds shortens development time by 36% and reduces costs by 19 23% compared with the conventional ap-proach. Meanwhile, the information on
毕业设计外文翻译
毕业设计（论文） 外文翻译 题目西安市水源工程中的 水电站设计 专业水利水电工程 班级 学生 指导教师 2016年
研究钢弧形闸门的动态稳定性 牛志国 河海大学水利水电工程学院，中国南京，邮编210098 nzg_197901@https://www.360docs.net/doc/df6008166.html,，niuzhiguo@https://www.360docs.net/doc/df6008166.html, 李同春 河海大学水利水电工程学院，中国南京，邮编210098 ltchhu@https://www.360docs.net/doc/df6008166.html, 摘要 由于钢弧形闸门的结构特征和弹力，调查对参数共振的弧形闸门的臂一直是研究领域的热点话题弧形弧形闸门的动力稳定性。在这个论文中，简化空间框架作为分析模型，根据弹性体薄壁结构的扰动方程和梁单元模型和薄壁结构的梁单元模型，动态不稳定区域的弧形闸门可以通过有限元的方法，应用有限元的方法计算动态不稳定性的主要区域的弧形弧形闸门工作。此外，结合物理和数值模型，对识别新方法的参数共振钢弧形闸门提出了调查，本文不仅是重要的改进弧形闸门的参数振动的计算方法，但也为进一步研究弧形弧形闸门结构的动态稳定性打下了坚实的基础。 简介 低举升力，没有门槽，好流型，和操作方便等优点，使钢弧形闸门已经广泛应用于水工建筑物。弧形闸门的结构特点是液压完全作用于弧形闸门，通过门叶和主大梁，所以弧形闸门臂是主要的组件确保弧形闸门安全操作。如果周期性轴向载荷作用于手臂，手臂的不稳定是在一定条件下可能发生。调查指出:在弧形闸门的20次事故中，除了极特殊的破坏情况下，弧形闸门的破坏的原因是弧形闸门臂的不稳定;此外，明显的动态作用下发生破坏。例如:张山闸，位于中国的江苏省，包括36个弧形闸门。当一个弧形闸门打开放水时，门被破坏了，而其他弧形闸门则关闭，受到静态静水压力仍然是一样的，很明显，一个动态的加载是造成的弧形闸门破坏一个主要因素。因此弧形闸门臂的动态不稳定是造成弧形闸门(特别是低水头的弧形闸门)破坏的主要原是毫无疑问。
英文翻译与英文原文.陈--
翻译文献：INVESTIGATION ON DYNAMIC PERFORMANCE OF SLIDE UNIT IN MODULAR MACHINE TOOL （对组合机床滑台动态性能的调查报告） 文献作者：Peter Dransfield, 出处：Peter Dransfield, Hydraulic Control System-Design and Analysis of TheirDynamics, Springer-Verlag, 1981 翻译页数：p139—144 英文译文： 对组合机床滑台动态性能的调查报告 【摘要】这一张纸处理调查利用有束缚力的曲线图和状态空间分析法对组合机床滑台的滑动影响和运动平稳性问题进行分析与研究，从而建立了滑台的液压驱动系统一自调背压调速系统的动态数学模型。通过计算机数字仿真系统，分析了滑台产生滑动影响和运动不平稳的原因及主要影响因素。从那些中可以得出那样的结论，如果能合理地设计液压缸和自调背压调压阀的结构尺寸. 本文中所使用的符号如下： s1-流源，即调速阀出口流量； S el—滑台滑动摩擦力 R一滑台等效粘性摩擦系数： I1—滑台与油缸的质量 12—自调背压阀阀心质量 C1、c2—油缸无杆腔及有杆腔的液容； C2—自调背压阀弹簧柔度； R1, R2自调背压阀阻尼孔液阻， R9—自调背压阀阀口液阻 S e2—自调背压阀弹簧的初始预紧力； I4, I5—管路的等效液感 C5、C6—管路的等效液容： R5, R7-管路的等效液阻； V3, V4—油缸无杆腔及有杆腔内容积； P3, P4—油缸无杆腔及有杆腔的压力 F—滑台承受负载， V—滑台运动速度。本文采用功率键合图和状态空间分折法建立系统的运动数学模型，滑台的动态特性可以能得到显著改善。
污水处理外文翻译(带原文)
提高塔式复合人工湿地处理农村生活污水的 脱氮效率1 摘要： 努力保护水源，尤其是在乡镇地区的饮用水源，是中国污水处理当前面临的主要问题。氮元素在水体富营养化和对水生物的潜在毒害方面的重要作用，目前废水脱氮已成为首要关注的焦点。人工湿地作为一种小型的，处理费用较低的方法被用于处理乡镇生活污水。比起活性炭在脱氮方面显示出的广阔前景，人工湿地系统由于溶解氧的缺乏而在脱氮方面存在一定的制约。为了提高脱氮效率，一种新型三阶段塔式混合湿地结构----人工湿地（thcw）应运而生。它的第一部分和第三部分是水平流矩形湿地结构，第二部分分三层，呈圆形，呈紊流状态。塔式结构中水流由顶层进入第二层及底层，形成瀑布溢流，因此水中溶解氧浓度增加，从而提高了硝化反应效率，反硝化效率也由于有另外的有机物的加入而得到了改善，增加反硝化速率的另一个原因是直接通过旁路进入第二部分的废水中带入的足量有机物。常绿植物池柏（Taxodium ascendens），经济作物蔺草（Schoenoplectus trigueter），野茭白（Zizania aquatica），有装饰性的多花植物睡莲（Nymphaea tetragona），香蒲（Typha angustifolia）被种植在湿地中。该系统对总悬浮物、化学需氧量、氨氮、总氮和总磷的去除率分别为89%、85%、83%、83% 和64%。高水力负荷和低水力负荷（16 cm/d 和32 cm/d）对于塔式复合人工湿地结构的性能没有显著的影响。通过硝化活性和硝化速率的测定，发现硝化和反硝化是湿地脱氮的主要机理。塔式复合人工湿地结构同样具有观赏的价值。 关键词： 人工湿地；硝化作用；反硝化作用；生活污水；脱氮；硝化细菌；反硝化细菌 １. 前言 对于提高水源水质的广泛需求，尤其是提高饮用水水源水质的需求是目前废水深度处理的技术发展指向。在中国的乡镇地区，生活污水是直接排入湖泊、河流、土壤、海洋等水源中。这些缺乏处理的污水排放对于很多水库、湖泊不能达到水质标准是有责任的。许多位于中国的乡镇地区的社区缺乏足够的生活污水处理设备。由于山区地形、人口分散、经济基础差等原因，废水的收集和处理是很成问题的。由于资源短缺，经济欠发达地区所采取的废水处理技术必须低价高效，并且要便于施用，能量输入及维护费用较低，而且要保证出水能达标。建造在城市中基于活性污泥床的废水集中处理厂，对于小乡镇缺乏经济适用性，主要是由于污水收集结构的建造费用高。 1Ecological Engineering，Fen xia ，Ying Li。
ABS塑件的注射成型工艺分析及模具设计外文翻译
毕业设计（论文）外文资料翻译 学生姓名: 学号: 专业: 指导教师: 学院: 日期:
外文资料翻译要求 一、译文内容须与课题研究或调研内容高度一致。 二、译文翻译得当、语句通顺，不少于4000字。 三、译文格式要求：译文题目（即一级标题）采用小三黑体、二级 标题采用四号黑体、三级标题采用13磅黑体；图题和表题采用五号宋体，外文和符号采用五号Times New Roman；正文采用小四宋体，外文和符号采用小四Times New Roman，行间距为20磅；A4纸双面打印。 四、原文及译文一起装订，顺序依次为封面（背面为外文资料翻译 要求）、译文评阅（单面打印）、译文、外文原文。
译文评阅 评分：___________________（百分制）指导教师（签名）：___________________ 年月日
原文 Treating and the modern mould make high speed One, summarizes 1 the present situation that the mould makes at present and trend The mould is important handicraft equipment , occupies decisive position in industrid departments such as consumer goods , electrical equipment electron , automobile , aircraft fabrication. The mould is important handicraft equipment , occupies decisive position in industrid departments such as consumer goods , electrical equipment electron , automobile , aircraft fabrication. Industrial product part rough process 75%, the finish machining 50% and plastic part 90% will be completed from the mould. The Chinese mould market demand already reaches scale of 500 hundred million yuan at present. The automobile mould , the annual growth rate covering piece of mould especially will exceed 20 %; Also prompt building material mould development , various heterotype material the mould , wall surface and floor mould become new mould growth point , plastic doors and windows and plastic drain-pipe increase to exceeding 30 by in the upcoming several years %; The home appliance mould annual growth rate will exceed 10 %; The IT industry year increases % speed equally exceeding 20 , the need to the mould accounts for 20 of mould marketplace %.2004 annual Chinese machine tools implements industry output value will continue to increase. Our country mould fabrication market potential is enormous. The basis data counts , in recent years, our country mould year gross output value reaches 3 billion U. S. dollar , entrance exceeds 1 billion U. S. dollar, exceed 100 million U. S. dollar outlet. Increase by from 25% to increase to 2005 50% of 1995. The expert foretells that abroad: Asia portion being occupied by in mould fabrication in the whole world, will from 25% to increase to 2005 50% of 1995.
毕设外文文献翻译
xxxxxxxxx 毕业设计（论文）外文文献翻译 （本科学生用） 题目：Poduct Line Engineering: The State of the Practice 生产线工程：实践的形态 学生姓名：学号： 学部（系）: 专业年级: 指导教师：职称或学位： 2011年3月10日
外文文献翻译（译成中文1000字左右）： 【主要阅读文献不少于5篇，译文后附注文献信息，包括：作者、书名（或论文题目）、出版社（或刊物名称）、出版时间（或刊号）、页码。提供所译外文资料附件（印刷类含封面、封底、目录、翻译部分的复印件等，网站类的请附网址及原文】 Requirements engineering practices A precise requirements engineering process— a main driver for successful software development —is even more important for product line engineering. Usually, the product line’s scope addresses various domains simultaneously. This makes requirements engineering more complex. Furthermore, SPL development involves more tasks than single-product development. Many product line requirements are complex, interlinked, and divided into common and product-specific requirements. So, several requirements engineering practices are important specifically in SPL development: ? Domain identification and modeling, as well as commonalities and variations across product instances Separate specification and verification for platform and product requirements ? Management of integrating future requirements into the platform and products ? Identification, modeling, and management of requirement dependencies The first two practices are specific to SPL engineering. The latter two are common to software development but have much higher importance for SPLs. Issues with performing these additional activities can severely affect the product line’s long-term success. During the investigation, we found that most organizations today apply organizational and procedural measures to master these challenges. The applicability of more formal requirements engineering techniques and tools appeared rather limited, partly because such techniques are not yet designed to cope with product line evelopment’s inherent complexities. The investigation determined that the following three SPL requirements engineering practices were most important to SPL success. Domain analysis and domain description. Before starting SPL development, organizations should perform a thorough domain analysis. A well-understood domain is a prerequisite for defining a suitable scope for the product line. It’s the foundation for efficiently identifying and distinguishing platform and product requirements. Among the five participants in our investigation, three explicitly modeled the product line requirements. The others used experienced architects and domain experts to develop the SPL core assets without extensive requirements elicitation. Two organizations from the first group established a continuous requirements management that maintained links between product line and product instance requirements. The three other organizations managed their core assets’ evolution using change management procedures and versioning concepts. Their business did not force them to maintain more detailed links between the requirements on core assets and product instances. The impact of architectural decisions on requirements negotiations. A stable but flexible architecture is important for SPL development. However, focusing SPL evolution too much on architectural issues will lead to shallow or even incorrect specifications. It can cause core assets to ignore important SPL requirements so that the core assets lose relevance for SPL development. Organizations can avoid this problem by establishing clear responsibilities for requirements management in addition to architectural roles. The work group participants reported that a suitable organizational tool for balancing requirements and architecture is roundtable meetings in which requirements engineers,
外文翻译原文
204/JOURNAL OF BRIDGE ENGINEERING/AUGUST1999
JOURNAL OF BRIDGE ENGINEERING /AUGUST 1999/205 ends.The stress state in each cylindrical strip was determined from the total potential energy of a nonlinear arch model using the Rayleigh-Ritz method. It was emphasized that the membrane stresses in the com-pression region of the curved models were less than those predicted by linear theory and that there was an accompanying increase in ?ange resultant force.The maximum web bending stress was shown to occur at 0.20h from the compression ?ange for the simple support stiffness condition and 0.24h for the ?xed condition,where h is the height of the analytical panel.It was noted that 0.20h would be the optimum position for longitudinal stiffeners in curved girders,which is the same as for straight girders based on stability requirements.From the ?xed condition cases it was determined that there was no signi?cant change in the membrane stresses (from free to ?xed)but that there was a signi?cant effect on the web bend-ing stresses.Numerical results were generated for the reduc-tion in effective moment required to produce initial yield in the ?anges based on curvature and web slenderness for a panel aspect ratio of 1.0and a web-to-?ange area ratio of 2.0.From the results,a maximum reduction of about 13%was noted for a /R =0.167and about 8%for a /R =0.10(h /t w =150),both of which would correspond to extreme curvature,where a is the length of the analytical panel (modeling the distance be-tween transverse stiffeners)and R is the radius of curvature.To apply the parametric results to developing design criteria for practical curved girders,the de?ections and web bending stresses that would occur for girders with a curvature corre-sponding to the initial imperfection out-of-?atness limit of D /120was used.It was noted that,for a panel with an aspect ratio of 1.0,this would correspond to a curvature of a /R =0.067.The values of moment reduction using this approach were compared with those presented by Basler (Basler and Thurlimann 1961;Vincent 1969).Numerical results based on this limit were generated,and the following web-slenderness requirement was derived: 2 D 36,500a a =1?8.6?34 (1) ? ??? t R R F w ?y where D =unsupported distance between ?anges;and F y =yield stress in psi. An extension of this work was published a year later,when Culver et al.(1973)checked the accuracy of the isolated elas-tically supported cylindrical strips by treating the panel as a unit two-way shell rather than as individual strips.The ?ange/web boundaries were modeled as ?xed,and the boundaries at the transverse stiffeners were modeled as ?xed and simple.Longitudinal stiffeners were modeled with moments of inertias as multiples of the AASHO (Standard 1969)values for straight https://www.360docs.net/doc/df6008166.html,ing analytical results obtained for the slenderness required to limit the plate bending stresses in the curved panel to those of a ?at panel with the maximum allowed out-of-?atness (a /R =0.067)and with D /t w =330,the following equa-tion was developed for curved plate girder web slenderness with one longitudinal stiffener: D 46,000a a =1?2.9 ?2.2 (2) ? ? ? t R f R w ?b where the calculated bending stress,f b ,is in psi.It was further concluded that if longitudinal stiffeners are located in both the tension and compression regions,the reduction in D /t w will not be required.For the case of two stiffeners,web bending in both regions is reduced and the web slenderness could be de-signed as a straight girder panel.Eq.(1)is currently used in the ‘‘Load Factor Design’’portion of the Guide Speci?cations ,and (2)is used in the ‘‘Allowable Stress Design’’portion for girders stiffened with one longitudinal stiffener.This work was continued by Mariani et al.(1973),where the optimum trans-verse stiffener rigidity was determined analytically. During almost the same time,Abdel-Sayed (1973)studied the prebuckling and elastic buckling behavior of curved web panels and proposed approximate conservative equations for estimating the critical load under pure normal loading (stress),pure shear,and combined normal and shear loading.The linear theory of shells was used.The panel was simply supported along all four edges with no torsional rigidity of the ?anges provided.The transverse stiffeners were therefore assumed to be rigid in their directions (no strains could be developed along the edges of the panels).The Galerkin method was used to solve the governing differential equations,and minimum eigenvalues of the critical load were calculated and presented for a wide range of loading conditions (bedding,shear,and combined),aspect ratios,and curvatures.For all cases,it was demonstrated that the critical load is higher for curved panels over the comparable ?at panel and increases with an increase in curvature. In 1980,Daniels et al.summarized the Lehigh University ?ve-year experimental research program on the fatigue behav-ior of horizontally curved bridges and concluded that the slen-derness limits suggested by Culver were too severe.Equations for ‘‘Load Factor Design’’and for ‘‘Allowable Stress Design’’were developed (respectively)as D 36,500a =1?4?192(3)? ?t R F w ?y D 23,000a =1?4 ?170 (4) ? ? t R f w ?b The latter equation is currently used in the ‘‘Allowable Stress Design’’portion of the Guide Speci?cations for girders not stiffened longitudinally. Numerous analytical and experimental works on the subject have also been published by Japanese researchers since the end of the CURT project.Mikami and colleagues presented work in Japanese journals (Mikami et al.1980;Mikami and Furunishi 1981)and later in the ASCE Journal of Engineering Mechanics (Mikami and Furunishi 1984)on the nonlinear be-havior of cylindrical web panels under bending and combined bending and shear.They analyzed the cylindrical panels based on Washizu’s (1975)nonlinear theory of shells.The governing nonlinear differential equations were solved numerically by the ?nite-difference method.Simple support boundary condi-tions were assumed along the curved boundaries (top and bot-tom at the ?ange locations)and both simple and ?xed support conditions were used at the straight (vertical)boundaries.The large displacement behavior was demonstrated by Mi-kami and Furunishi for a range of geometric properties.Nu-merical values of the load,de?ection,membrane stress,bend-ing stress,and torsional stress were obtained,but no equations for design use were presented.Signi?cant conclusions include that:(1)the compressive membrane stress in the circumfer-ential direction decreases with an increase in curvature;(2)the panel under combined bending and shear exhibits a lower level of the circumferential membrane stress as compared with the panel under pure bending,and as a result,the bending moment carried by the web panel is reduced;and (3)the plate bending stress under combined bending and shear is larger than that under pure bending.No formulations or recommendations for direct design use were made. Kuranishi and Hiwatashi (1981,1983)used the ?nite-ele-ment method to demonstrate the elastic ?nite displacement be-havior of curved I-girder webs under bending using models with and without ?ange rigidities.Rotation was not allowed (?xed condition)about the vertical axis at the ends of the panel (transverse stiffener locations).Again,the nonlinear distribu-