(9)外文翻译

本科毕业论文外文参考文献译文及原文学院经济与贸易学院专业经济学（贸易方向）年级班别2007级 1 班学号3207004154学生姓名欧阳倩指导教师童雪晖2010 年 6 月 3 日目录1 外文文献译文（一）中国银行业的改革和盈利能力（第1、2、4部分） (1)2 外文文献原文（一）CHINA’S BANKING REFORM AND PROFITABILITY（Part 1、2、4） (9)1概述世界银行（1997年）曾声称，中国的金融业是其经济的软肋。

当一国的经济增长的可持续性岌岌可危的时候，金融业的改革一直被认为是提高资金使用效率和消费型经济增长重新走向平衡的必要（Lardy，1998年，Prasad，2007年）。

事实上，不久前，中国的国有银行被视为“技术上破产”，它们的生存需要依靠充裕的国家流动资金。

但是，在银行改革开展以来，最近，强劲的盈利能力已恢复到国有商业银行的水平。

但自从中国的国有银行在不久之前已经走上了改革的道路，它可能过早宣布银行业的改革尚未取得完全的胜利。

此外，其坚实的财务表现虽然强劲，但不可持续增长。

随着经济增长在2008年全球经济衰退得带动下已经开始软化，银行预计将在一个比以前更加困难的经济形势下探索。

本文的目的不是要评价银行业改革对银行业绩的影响，这在一个完整的信贷周期后更好解决。

相反，我们的目标是通过审查改革的进展和银行改革战略，并分析其近期改革后的强劲的财务表现，但是这不能完全从迄今所进行的改革努力分离。

本文有三个部分。

在第二节中，我们回顾了中国的大型国有银行改革的战略，以及其执行情况，这是中国银行业改革的主要目标。

第三节中分析了2007年的财务表现集中在那些在市场上拥有浮动股份的四大国有商业银行：中国工商银行（工商银行），中国建设银行（建行），对中国银行（中银）和交通银行（交通银行）。

引人注目的是中国农业银行，它仍然处于重组上市过程中得适当时候的后期。

第四节总结一个对银行绩效评估。

江西理工大学应用科学院院毕业设计(论文)外文资料翻译系：信息工程系专业：计算机班级：072班姓名：熊聪聪学号： 5号附件： 1.外文资料翻译译文；2.外文原文。

注：请将该封面与附件装订成册。

基于DirectX和C#的3D游戏引擎编程介绍导言介绍3D游戏引擎设计使用DirectX 9和C＃说明了创建一个简单的3D游戏引擎的过程。

在这个过程中，作者演示了琳哈里森通过DirectX 9的鲜明例子说明和软件的许多方面。

纵观本书中，您将开发一个越野赛车游戏带来的大场景，环境影响，并发挥物理管理等功能。

写游戏，你将使用最先进的技术，C＃和DirectX和。

NET框架，而且你会超越简单的图形，探索音频，用户输入，人工智能和多人的设计。

第一章：概述这一章看看几种不同类型的游戏引擎，以及游戏和游戏引擎之间的区别。

游戏引擎的设计比游戏本身里的硬编码渲染和游戏逻辑需要更多的考量。

好处是，对底层技术更好的重用性以及总体设计的清晰性。

第二章：用户接口游戏的用户接口提供输出给玩家信息和获取玩家命令的方法。

这一章研究显示信息的几种方式：splash screens，选项屏幕，以及控制台屏幕。

也考虑使用DirectInput获取玩家键盘，鼠标和手柄的输入。

第三章：Hanging Ten :走马观花渲染流水线在深入到三维对象实际渲染之前，最好是对渲染流水线先有个基本的了解。

这一章将带领你走马观花般了解一下固定渲染流水线包括的几个典型步骤。

这包含操作摄像机，以便在游戏中提供视点。

也给出了将会使用在所有渲染对象中的一个基础类。

剔除对象和提高效率的其他技术也会被研究。

这些步骤的实际讲解出现在第四章到第八章。

第四章：基础的3D对象这一章是接下来两章中的第一章，处理游戏中使用的各种类型的对象的渲染。

这些对象包含天空盒，用来提供远景；地形渲染，提供可以在上面移动的表面；简单的对称对象，公告牌；以及粒子系统。

粒子系统是一个非常强大的工具，可以使用在微小对象的动态系统中，包括流动的水，火，烟火和流沙。

外文文献的翻译方法和技巧在科学研究领域，阅读和理解外文文献是非常重要的，因为这些文献包含了世界各地研究者的最新成果和观点。

然而，由于语言障碍，许多人可能觉得翻译外文文献是一项困难的任务。

本文将介绍一些有效的翻译方法和技巧，帮助读者更好地理解和翻译外文文献。

选择合适的翻译工具在翻译外文文献时，选择合适的工具是非常重要的。

一些常见的翻译工具包括在线翻译网站和翻译App。

这些工具可以帮助读者快速翻译文献，但需要注意的是，这些工具可能存在一定的翻译误差，因此在使用时要注意核对翻译结果。

保持原文的风格和语气在翻译外文文献时，要尽可能保持原文的风格和语气。

这样可以更好地传达原作者的意图和思想。

在翻译过程中，读者可以使用词典等工具帮助理解原文中的专业术语和文化背景，以确保翻译的准确性和通顺性。

注意语法和语法结构另一个翻译外文文献的重要方面是注意语法和语法结构。

外文文献往往使用复杂的句子结构和语法规则，因此在翻译时要保持句子的逻辑和结构。

正确理解原文中的句子结构和语法规则，可以帮助读者更好地翻译文献并消除歧义。

查找背景知识和参考资料翻译外文文献时，有时可能会遇到一些专业术语和概念，读者不熟悉。

在这种情况下，建议读者查找相关背景知识和参考资料，帮助理解原文中的内容。

这样不仅可以提高翻译的准确性，还可以扩展读者的知识面。

结语总的来说，翻译外文文献是一项需要一定技巧和耐心的工作。

通过选择合适的翻译工具、保持原文的风格和语气、注意语法和语法结构、查找背景知识和参考资料，读者可以更好地理解和翻译外文文献。

希望本文介绍的方法和技巧对读者有所帮助。

Stability of hybrid system limit cycles: application to the compass gait biped RobotIan A. Hiskens'Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana-ChampaignUrbana IL 61801 USAAbstractLimit cycles are common in hybrid systems. However the non-smooth dynamics of such systems makes stability analysis difficult. This paper uses recent extensions of trajectory sensitivity analysis to obtain the characteristic multipliers of non-smooth limit cycles. The stability of a limit cycle is determined by its characteristic multipliers. The concepts are illustrated using a compass gait biped robot example.1 IntroductionHybrid system are characterized by interactions between continuous (smooth) dynamics and discrete events. Such systems are common across a diverse range of application areas. Examples include power systems [l], robotics [2, 3], manufacturing [4] and air-traffic control [5]. In fact, any system where saturation limits are routinely encountered can be thought of as a hybrid system. The limits introduce discrete events which (often) have a significant influence on overall behaviour.Many hybrid systems exhibit periodic behaviour. Discrete events, such as saturation limits, can act to trap the evolving system state within a constrained region of state space. Therefore even when the underlying continuous dynamics are unstable, discrete events may induce a stable limit set. Limit cycles (periodic behaviour) are often created in this way. Other systems, such as robot motion, are naturally periodic.Limit cycles can be stable (attracting), unstable (repelling) or non-stable (saddle). The stability of periodic behaviour is determined by characteristic (or Floquet) multipliers. A periodic solution corresponds to a fixed point of a Poincare map. Stability of the periodic solution is equivalent to stability of the fixed point. The characteristic multipliers are the eigenvalues of the Poincare map linearized about the fixed point. Section 4 reviews the connection between this linearized map and trajectory sensitivities.Poincare maps have been used to analyse the stability of limit cycles in various forms of hybrid systems. However calculation of the underlying trajectory sensitivities has relied upon particular system structures, see for example [7, 8], or numerical differencing, for example [6]. This paper uses a recent generalization of trajectory sensitivity analysis [9] to efficiently detemine the stability of limit cycles in hybrid systems.A hybrid system model is given in Section 2. Section 3 develops the associated variational equations. This is followed in Section 4 by a review of stability analysis of limit cycles. Conclusions and extensions are presented in Section 5.2 ModelDeterministic hybrid systems can be represented by a model that is adapted from a differential-algebraic (DAE) structure. Events are incorporated via impulsive action and switching of algebraic equations, giving the Impulsive Switched (DAIS) modelwheren x R ∈ are dynamic states and my R ∈ are algebraic states;(.)δ is the Dirac delta;(.)u is the unit-step function;,:n mnj f h RR +→；(0)(),:i n mng gR R ±+→; some elements of each(.)gwill usually be identicallyzero, but no elements of the composite g should be identically zero; the()i g± aredefined with the same form as g in (2), resulting in a recursive structure for g;,dey yare selected elements of y that trigger algebraic switching and state reset(impulsive) events respectively;dyandeymay share common elements.The impulse and unit-step terms of the DAIS model can be expressed in alternative forms:Each impulse term of the summation in (1) can be expressed in the state reset formwhere the notation x+denotes the value of x just after the reset event, whilstx-andy-refer to the values of x and y just prior to the event.The contribution of each()i g± in (2) can be expressed aswith (2) becomingThis form is often more intuitive than (2).It can be convenient to establish the partitionswherex -are the continuous dynamic states, for example generator angles, velocities andfluxes;z are discrete dynamic states, such as transformer tap positions and protection relay logic states;λ are parameters such as generator reactances, controller gains and switching times. The partitioning of the differential equations f ensures that away from events,x -evolves according to .(,)x y f x --=, whilst z and λ remain constant. Similarly,the partitioning of the reset equationsjhensures thatx -and λ remain constantat reset events, but the dynamic states z are reset to new values given by(,)jh y x z--+=-. The model can capture complex behaviour, from hysteresis and non-windup limits through to rule-based systems [l]. A more extensive presentation of this model is given in [9].Away from events, system dynamics evolve smoothly according to the familiardifferential-algebraic modelwhere g is composed of(0)gtogether with appropriate choices of()i g- or()i g+ ,depending on the signs of the corresponding elements of yd. At switching events (2),some component equations of g change. To satisfy the new g = 0 equation, algebraic variables y may undergo a step change. Reset events (3) force a discrete change in elements of x. Algebraic variables may also step at a reset event to ensure g= 0 is satisfied with the altered values of x. The flows of and y are defined respectively aswhere x(t) and y(t) satisfy (l),(2), along with initial conditions,3 'Ikajectory SensitivitiesSensitivity of the flowsxφandyφto initial conditionsxare obtained bylinearizing (8),(9) about the nominal trajectory,The time-varying partial derivative matrices given in (12),(13) are known as trajectory sensitiuities, and can be expressed in the alternative formsThe formxx ,xy provides clearer insights into the development of thevariational equations describing the evolution of the sensitivities. The alternative form 0(,)x t x φ, 0(,)yt x φ highlights the connection between the sensitivities and the associated flows. It is shown in Section 4 that these sensitivities underlie the linearization of the Poincare map, and so play a major role in determining the stability of periodic solutions.Away from events, where system dynamics evolve smoothly, trajectory sensitivities 0xx andxy are obtained by differentiating (6),(7) withrespect to 0x.This giveswhere/xf x f≡∂∂, and likewise for the other Jacobian matrices. Note that,,,xyxyf fg gare evaluated along the trajectory, and hence are time varyingmatrices. It is shown in 19, 101 that the numerical solution of this(potentially high order) DAE system can be obtained as a by-product of numerically integrating the original DAE system (6),(7). The extra computational cost is minimal. Initial conditions forxx are obtained from (10) aswhere I is the identity matrix. Initial conditions for 0zy follow directly from(17),Equations (16),(17) describe the evolution of the sensitivitiesxx andxybetween events. However at an event, the sensitivities are generally discontinuous. It is necessary to calculate jump conditions describing the step change inxx andxy . For clarity, consider a single switching/reset event, so the model (1),(2) reduces(effectively) to the formLet （(),()x y ττ） be the point where the trajectory encounters the triggering hypersurface s(x,y) = 0, i.e., the point where an event is initiated. This point is called the junction point and r is the junction time. It is assumed the encounter is transversal.Just prior to event triggering, at time τ-, we haveSimilarly,,y x++are defined for time τ+, just after the event has occurred. It isshown in [9] that the jump conditions for the sensitivitiesxx are given byThe assumption that the trajectory and triggering hypersurface meet transversally ensures a non-zero denominator for 0x τ The sensitivitiesxy . immediatelyafter the event are given byFollowing the event, i.e., for t τ+>, calculation of the sensitivities proceeds according to (16),(17) until the next event is encountered. The jump conditions provide the initial conditions for the post-event calculations.4 Limit Cycle AnalysisStability of limit cycles can be determined using Poincare maps [11, 12]. This section provides a brief review of these concepts, and establishes the connection with trajectory sensitivities.A Poincark map effectively samples the flow of a periodic system once every period. The concept is illustrated in Figure 1. If the limit cycle is stable, oscillations approach the limit cycle over time. The samples provided by the corresponding Poincare map approach a fixed point. A non-stable limit cycle results in divergent oscillations. For such a case the samples of the Poincare map diverge.To define a Poincare map, consider the limit cycle Γshown in Figure 1. Let ∑ be a hyperplane transversal to Γ at*x. The trajectory emanating from*xwill again encounter ∑ at*xafter T seconds, where T is the minimum period of the limit cycle. Due to the continuity of the flowxφwith respect to initial conditions, trajectories starting on ∑ in a neighbourhood of*x. will, in approximately T seconds, intersect ∑ in the vicinity of*x. Hencexφand ∑define a mappingwhere()kT x ττ≈ is the time taken for the trajectory to return to ∑. Complete details can hefound in [11,12]. Stability of the Paincare map (22) is determined by linearizing P at the fixed point*x, i.e.,From the definition of P(z) given by (22), it follows that DP(*x) is closely related to thetrajectory sensitivities***(,)(,)xxT T x x xφφ∂≡∂. In fact, it is shown in [11] thatwhereσ is a vector normal to ∑.The matrix*(,)xT x φis exactly the trajectory sensitivity matrix after one period of the limitcycle, i.e., starting from*xand returning to*x. This matrix is called the Monodromymatrix .It is shown in [11] that for an autonomous system, one eigenvalue of *(,)xT x φ isalways 1, and the corresponding eigenvector lies along **(,)f y x The remaining eigenvalues*(,)xT x φof coincide with the eigenvalues of DP(*x ), and are known as the characteristicmultipliers mi of the periodic solution. The characteristic multipliers are independent of the choice of cross-section ∑ . Therefore, for hybrid systems, it is often convenient to choose ∑ as a triggering hypersurface corresponding to a switching or reset event that occurs along the periodic solution.Because the characteristic multipliers mi are the eigenvalues of the linear map DP(x*), they determine the stability of the Poincarb map P(kx), and hence the stability of the periodic solution.Three cases are of importance: 1. Alli m lie within the unit circle, i.e., 1im<,i ∀.The map is stable, so the periodicsolution is stable. 2. Allim lie outside the unit circle. The periodic solution is unstable.3. Someim lie outside the unit circle. The periodic solution is non-stable.Interestingly, there exists a particular cross-section*∑, such thatwhere *ς∈∑.This cross-section*∑is the hyperplane spanned by the n - 1 eigenvectors of*(,)xT x φthat are not aligned with **(,)f y x . Therefore the vector *σthat is normal to*∑ is the left eigenvector of *(,)xT x φ corresponding to the eigenvalue 1. The hyperplane*∑is invariant under*(,)xT x φ, i.e., **(,)f y x maps vectors *ς∈∑back into*∑.5 ConclusionsHybrid systems frequently exhibit periodic behaviour. However the non-smooth nature of such systems complicates stability analysis. Those complications have been addressed in this paper throughapplication of a generalization of trajectory sensitivity analysis. Deterministic hybrid systems can be represented by a set ofdifferential-algebraic equations, modified to incorporate impulse (state reset) action and constraint switching. The associated variational equations establish jump conditions that describe the evolution of sensitivities through events. These equations provide insights into expansion/contraction effects at events. This is a focus of future research.Standard Poincar6 map results extend naturally to hybrid systems. The Monodromy matrix is obtained by evaluating trajectory sensitivities over one period of the (possibly non-smooth) cyclical behaviour. One eigenvalue of this matrix is always unity. The remaining eigenvalues are the characteristic multipliers of the periodic solution. Stability is ensured if all multipliers lieReferences[l] LA. Hiskens and M.A. Pai, “Hybrid systems view of power system modelling,” in Proceedings of the IEEE International Symposium on Circuits and Systems, Geneva, Switzerland, May 2000.[2] M.H. Raibert, Legged Robots That Balance, MIT Press, Cambridge, MA, 1986.[3] A. Goswami, B. Thuilot, and B. Espiau, “A study of the passive gait of a compass-like biped ro bot: symmetry and chaos,’’ International Journal of Robotics Research, vol. 17, no. 15, 1998.[4] S. Pettersson, “Analysis and design of hybrid systems,” Ph.D. Thesis, Department of Signals and Systems, Chalmers University of Technology, Goteborg, Sweden, 1999.[5] C. Tomlin, G. Pappas, and S. Sastry, “Conflict resolution for air traffic management:A study in multiagent hybrid systems,” IEEE Transactions on Automatic Control, vol. 43, no. 4, pp. 509-521, April 1998.[6] A. Goswami, B. Espiau, and A. Keramane, “Limit cycles in a passive compass gait biped and passivity-mimicking contr ol laws,” Journal of Au tonomous Robots, vol. 4, no. 3, 1997. 171 B.K.H. Wong, H.S.H. Chung, and S.T.S. Lee, ‘Computation of the cycle state-variable sensitivity matrix of PWM DC/DC converters and its applica tion,” IEEE Transactions on Circuit s and Systems I, vol. 47, no. 10, pp. 1542-1548, October 2000.[8] M. Rubensson, B. Lennartsson, and S. Petters son, “Convergence to limit cycles in hybrid systems - an example,” in Prepri nts of 8th International Federation of Automatic Control Symposium on Large Scale Systems: Theo y d Applications, Rio Patras, Greece, 1998, pp. 704-709.[9] I.A. Hiskens and M.A. Pai, “Trajectory sensitivity analysis of hyhrid systems,” IEEE Transactions on Circuits and Systems I, vol. 47, no. 2, pp. 204-220, February 2000.[10]D. Chaniotis, M.A. Pai, and LA. Hiskens, “Sen sitivity analysis of differential-algebraic systems using the GMRES method - Ap plication to power systems,” in Proceedings of the IEEE International Symposium on Circuits and Systems, Sydney, Australia, May 2001.[11]T.S Parker and L.O. Chua, Practical Numerical Algorithms for Chaotic Systems, Springer-Verlag, New York, NY, 1989.[12]R. Seydel, Practical Bifurcation and Stability Analysis, Springer-Verlag. New York, 2nd edition, 1994.。

毕业设计（论文）外文参考文献翻译计算机科学与信息工程系系（院）2008 届题目企业即时通Instant Messaging for Enterprises课题类型技术开发课题来源自选学生姓名许帅专业班级 04计算机科学与技术指导老师王占中职称工程师完成日期：2008年4 月 6 日目录I NSTANT M ESSAGING FOR E NTERPRISE (1)1. Tips (1)2. Introduction (1)3. First things first (2)4.The While-Accept loop (4)5. Per-Thread class (6)6. The Client class (7)企业即时通 (9)1.提示 (9)2.简介 (9)3.首先第一件事 (10)4.监听循环 (11)5.单线程类 (13)6.用户端类 (14)Instant Messaging for Enterprise1. TipsIf Java is, in fact, yet another computer programming language, you may question why it is so important and why it is being promoted as a revolutionary step in computer programming. The answer isn’t immediately obvious if you’re coming from a tr aditional programming perspective. Although Java is very useful for solving traditional standalone programming problems, it is also important because it will solve programming problems on the World Wide Web. What is the Web?The Web can seem a bit of a mys tery at first, with all this talk of “surfing,”“presence,” and “home pages.” It’s helpful to step back and see what it really is, but to do this you must understand client/server systems, another aspect of computing that is full of confusing issues. The primary idea of a client/server system is that you have a central repository of information，some kind of data, often in a database。

中国石油大学（华东）本科毕业设计（论文）外文翻译学生姓名：姜华学号：06083201专业班级：软件工程2006级2班指导教师：梁玉环2010年6月10日Database ManagementDatabase (sometimes spelled database) is also called an electronic database, referring to any collections of data, or information, that is specially organized for rapid search and retrieval by a computer. Databases are structured to facilitate the storage, retrieval modification and deletion of data in conjunction with various data-processing operations. Database can be stored on magnetic disk or tape, optical disk, or some other secondary storage device.A database consists of a file or a set of files. The information in the these files may be broken down into records, each of which consists of one or more fields are the basic units of data storage, and each field typically contains information pertaining to one aspect or attribute of the entity described by the database. Using keywords and various sorting commands, users can rapidly search, rearrange, group, and select the fields in many records to retrieve or create reports on particular aggregates of data.Database records and files must be organized to allow retrieval of the information. Early system were arranged sequentially (i.e., alphabetically, numerically, or chronologically); the development of direct-access storage devices made possible random access to data via indexes. Queries are the main way users retrieve database information. Typically the user provides a string of characters, and the computer searches the database for a corresponding sequence and provides the source materials in which those characters appear.A user can request, for example, all records in which the content of the field for a person’s last name is the word Smith.The many users of a large database must be able to manipulate the information within it quickly at any given time. Moreover, large business and other organizations tend to build up many independent files containing related and even overlapping data, and their data, processing activities often require the linking of data from several files. Several different types of database management systems have been developed to support these requirements: flat, hierarchical, network, relational, and object-oriented.In flat databases, records are organized according to a simple list of entities; many simple databases for personal computers are flat in structure. The records in hierarchical databases are organized in a treelike structure, with each level of records branching off into a set of smaller categories. Unlike hierarchical databases, which provide single links between sets of records at different levels, network databases create multiple linkages between sets by placing links, or pointers, to one set of records in another; the speed and versatility of network databases have led to their wide use in business. Relational databases are used where associations among files or records cannot be expressed by links; a simple flat list becomes one table, or “relation”, and multiple relations can be mathematically as sociated toyield desired information. Object-oriented databases store and manipulate more complex data structures, called “objects”, which are organized into hierarchical classes that may inherit properties from classes higher in the chain; this database structure is the most flexible and adaptable.The information in many databases consists of natural-language texts of documents; number-oriented database primarily contain information such as statistics, tables, financial data, and raw scientific and technical data. Small databases can be maintained on personal-computer systems and may be used by individuals at home. These and larger databases have become increasingly important in business life. Typical commercial applications include airline reservations, production management, medical records in hospitals, and legal records of insurance companies. The largest databases are usually maintained by governmental agencies, business organizations, and universities. These databases may contain texts of such materials as catalogs of various kinds. Reference databases contain bibliographies or indexes that serve as guides to the location of information in books, periodicals, and other published literature. Thousands of these publicly accessible databases now exist, covering topics ranging from law, medicine, and engineering to news and current events, games, classified advertisements, and instructional courses. Professionals such as scientists, doctors, lawyers, financial analysts, stockbrokers, and researchers of all types increasingly rely on these databases for quick, selective access to large volumes of information.DBMS Structuring TechniquesSequential, direct, and other file processing approaches are used to organize and structure data in single files. But a DBMS is able to integrate data elements from several files to answer specific user inquiries for information. That is, the DBMS is able to structure and tie together the logically related data from several large files.Logical Structures. Identifying these logical relationships is a job of the data administrator. A data definition language is used for this purpose. The DBMS may then employ one of the following logical structuring techniques during storage access, and retrieval operations.List structures. In this logical approach, records are linked together by the use of pointers. A pointer is a data item in one record that identifies the storage location of another logically related record. Records in a customer master file, for example, will contain the name and address of each customer, and each record in this file is identified by an account number. During an accounting period, a customer may buy a number of items on different days. Thus, the company may maintain an invoice file to reflect these transactions. A list structure could be used in this situation to show the unpaid invoices at any given time. Each record in the customer in the invoice file. This invoice record, in turn, would be linked to later invoices for the customer. The last invoice in the chain would be identified by the useof a special character as a pointer.Hierarchical (tree) structures. In this logical approach, data units are structured in multiple levels that graphically resemble an “upside down” tree with the root at the top and the branches formed below. There’s a superior-subordinate relationship in a hierarchical (tree) structure. Below the single-root data component are subordinate elements or nodes, each of which, in turn, “own” one or more other elements (or none). Each element or branch in this structure below the root has only a single owner. Thus, a customer owns an invoice, and the invoice has subordinate items. The branches in a tree structure are not connected.Network Structures. Unlike the tree approach, which does not permit the connection of branches, the network structure permits the connection of the nodes in a multidirectional manner. Thus, each node may have several owners and may, in turn, own any number of other data units. Data management software permits the extraction of the needed information from such a structure by beginning with any record in a file.Relational structures. A relational structure is made up of many tables. The data are stored in the form of “relations” in these tables. For example, relation t ables could be established to link a college course with the instructor of the course, and with the location of the class.To find the name of the instructor and the location of the English class, the course/instructor relation is searched to get the name (“Fitt”), and the course/location relation is a relatively new database structuring approach that’s expected to be widely implemented in the future.Physical Structures. People visualize or structure data in logical ways for their own purposes. Thus, records R1 and R2 may always be logically linked and processed in sequence in one particular application. However, in a computer system it’s quite possible that these records that are logically contiguous in one application are not physically stored together. Rather, the physical structure of the records in media and hardware may depend not only on the I/O and storage devices and techniques used, but also on the different logical relationships that users may assign to the data found in R1and R2. For example, R1 and R2 may be records of credit customers who have shipments send to the same block in the same city every 2 weeks. From the shipping department manager’s perspective, then, R1 and R2 are sequential entries on a geographically organized shipping report. But in the A/R application, the customers represented by R1 and R2 may be identified, and their accounts may be processed, according to their account numbers which are widely separated. In short, then, the physical location of the stored records in many computer-based information systems is invisible to users.Database Management Features of OracleOracle includes many features that make the database easier to manage. We’ve divided the discussion in this section into three categories: Oracle Enterprise Manager, add-on packs,backup and recovery.1. Oracle Enterprise ManagerAs part of every Database Server, Oracle provides the Oracle Enterprise Manager (EM), a database management tool framework with a graphical interface used to manage database users, instances, and features (such as replication) that can provide additional information about the Oracle environment.Prior to the Oracle8i database, the EM software had to be installed on Windows 95/98 or NT-based systems and each repository could be accessed by only a single database manager at a time. Now you can use EM from a browser or load it onto Windows 95/98/2000 or NT-based systems. Multiple database administrators can access the EM repository at the same time. In the EM repository for Oracle9i, the super administrator can define services that should be displayed on other administrators’ consoles, and management regions can be set up.2. Add-on packsSeveral optional add-on packs are available for Oracle, as described in the following sections. In addition to these database-management packs, management packs are available for Oracle Applications and for SAP R/3.(1)standard Management PackThe Standard Management Pack for Oracle provides tools for the management of small Oracle databases (e.g., Oracle Server/Standard Edition). Features include support for performance monitoring of database contention, I/O, load, memory use and instance metrics, session analysis, index tuning, and change investigation and tracking.(2)Diagnostics PackYou can use the Diagnostic Pack to monitor, diagnose, and maintain the health of Enterprise Edition databases, operating systems, and applications. With both historical and real-time analysis, you can automatically avoid problems before they occur. The pack also provides capacity planning features that help you plan and track future system-resource requirements.(3)Tuning PackWith the Tuning Pack, you can optimise system performance by identifying and tuning Enterprise Edition databases and application bottlenecks such as inefficient SQL, poor data design, and the improper use of system resources. The pack can proactively discover tuning opportunities and automatically generate the analysis and required changes to tune the systems.(4)Change Management PackThe Change Management Pack helps eliminate errors and loss of data when upgrading Enterprise Edition databases to support new applications. It impact and complex dependencies associated with application changes and automatically perform databaseupgrades. Users can initiate changes with easy-to-use wizards that teach the systematic steps necessary to upgrade.(5)AvailabilityOracle Enterprise Manager can be used for managing Oracle Standard Edition and/or Enterprise Edition. Additional functionality is provided by separate Diagnostics, Tuning, and Change Management Packs.3. Backup and RecoveryAs every database administrator knows, backing up a database is a rather mundane but necessary task. An improper backup makes recovery difficult, if not impossible. Unfortunately, people often realize the extreme importance of this everyday task only when it is too late –usually after losing business-critical data due to a failure of a related system.The following sections describe some products and techniques for performing database backup operations.(1)Recovery ManagerTypical backups include complete database backups (the most common type), database backups, control file backups, and recovery of the database. Previously, Oracle’s Enterprise Backup Utility (EBU) provided a similar solution on some platforms. However, RMAN, with its Recovery Catalog stored in an Oracle database, provides a much more complete solution. RMAN can automatically locate, back up, restore, and recover databases, control files, and archived redo logs. RMAN for Oracle9i can restart backups and restores and implement recovery window policies when backups expire. The Oracle Enterprise Manager Backup Manager provides a GUI-based interface to RMAN.(2)Incremental backup and recoveryRMAN can perform incremental backups of Enterprise Edition databases. Incremental backups back up only the blocks modified since the last backup of a datafile, tablespace, or database; thus, they’re smaller and faster than complete backups. RMAN can also perform point-in-time recovery, which allows the recovery of data until just prior to a undesirable event.(3)Legato Storage ManagerVarious media-management software vendors support RMAN. Oracle bundles Legato Storage Manager with Oracle to provide media-management services, including the tracking of tape volumes, for up to four devices. RMAN interfaces automatically with the media-management software to request the mounting of tapes as needed for backup and recovery operations.(4)AvailabilityWhile basic recovery facilities are available for both Oracle Standard Edition and Enterprise Edition, incremental backups have typically been limited to Enterprise Edition. Choosing between Oracle and SQL ServerI have to decide between using the Oracle database and WebDB vs. Microsoft SQL Server with Visual Studio. This choice will guide our future Web projects. What are the strong points of each of these combinations and what are the negatives?Lori: Making your decision will depend on what you already have. For instance, if you want to implement a Web-based database application and you are a Windows-only shop, SQL Server and the Visual Studio package would be fine. But the Oracle solution would be better with mixed platforms.There are other things to consider, such as what extras you get and what skills are required. WebDB is a content management and development tool that can be used by content creators, database administrators, and developers without any programming experience. WebDB is a browser-based tool that helps ease content creation and provides monitoring and maintenance tools. This is a good solution for organizations already using Oracle. Oracle also scales better than SQL Server, but you will need to have a competent Oracle administrator on hand.The SQL Sever/Visual Studio approach is more difficult to use and requires an experienced object-oriented programmer or some extensive training. However, you do get a fistful of development tools with Visual Studio: Visual Basic, Visual C++, and Visual InterDev for only $1,619. Plus, you will have to add the cost of the SQL Server, which will run you $1,999 for 10 clients or $3,999 for 25 clients-a less expensive solution than Oracle’s.Oracle also has a package solution that starts at $6,767, depending on the platform selected. The suite includes not only WebDB and Oracle8i but also other tools for development such as the Oracle application server, JDeveloper, and Workplace Templates, and the suite runs on more platforms than the Microsoft solution does. This can be a good solution if you are a start-up or a small to midsize business. Buying these tools in a package is less costly than purchasing them individually.Much depends on your skill level, hardware resources, and budget. I hope this helps in your decision-making.Brooks: I totally agree that this decision depends in large part on what infrastructure and expertise you already have. If the decision is close, you need to figure out who’s going to be doing the work and what your priorities are.These two products have different approaches, and they reflect the different personalities of the two vendors. In general, Oracle products are designed for very professional development efforts by top-notch programmers and project leaders. The learning period is fairly long, and the solution is pricey; but if you stick it out you will ultimately have greater scalability and greater reliability.If your project has tight deadlines and you don’t have the time and/or money to hire a team of very expensive, very experienced developers, you may find that the Oracle solutioni s an easy way to get yourself in trouble. There’s nothing worse than a poorly developed Oracle application.What Microsoft offers is a solution that’s aimed at rapid development and low-cost implementation. The tools are cheaper, the servers you’ll run it on are cheaper, and the developers you need will be cheaper. Choosing SQL Sever and Visual Studio is an excellent way to start fast.Of course, there are trade-offs. The key problem I have with Visual Studio and SQL Server is that you’ll be tied to Microso ft operating systems and Intel hardware. If the day comes when you need to support hundreds of thousands of users, you really don’t have anywhere to go other than buying hundreds of servers, which is a management nightmare.If you go with the Microsoft approach, it sounds like you may not need more than Visual Interdev. If you already know that you’re going to be developing ActiveX components in Visual Basic or Visual C++, that’s warning sign that maybe you should look at the Oracle solution more closely.I want to emphasize that, although these platforms have their relative strengths and weaknesses, if you do it right you can build a world-class application on either one. So if you have an organizational bias toward one of the vendors, by all means go with it. If you’re starting out from scratch, you’re going to have to ask yourself whether your organization leans more toward perfectionism or pragmatism, and realize that both “isms” have their faults.数据库管理数据库（有时拼成Database）也称为电子数据库，是指由计算机特别组织的快速查找和检索的任意的数据或信息集合。

本科毕业论文（设计）外文翻译外文题目 No train, no gain 外文出处People Management,2002(9):p41-42_外文作者 Carolyn Cohen原文：No train, no gainCarolyn CohenTraining is one of the key factors in the attracting and retaining staff, and it is often talked about in corporate circles: “What kind of training programs does your organization offer? How much does your organization spend per employee on training? Yes, I enjoyed that training program but it didn’t change how I do things on the job." Training, we’re told, may be one of the reasons why big organizations with lots of resources have an edge over smaller organizations. But even when we buy into the idea that training is a good thing for everyone involved, and we make the decision to allocate resources to it, we often don’t know where to start. We just want to be as sure as we can that we’ll get some return on our investment. Let’s take a look at why we need to offer training in the first place. Then, w e’ll consider what our training should be about, how we should offer it and what we need to do to ensure that the training we do provide has some lasting value.The benefits of trainingTraining can prepare your staff for increased demands due to changes in the way your business operates, technological or market changes or for the commitment you’ve made to a new standard of excellence. The bottom-line advantage to your business is likely to be financial gain as a result of greater productivity. Training can also help improve employee morale, reduce turnover, and enhance a company’s public image——which ultimately aids in business development and in attracting high-quality staff.Most employees will tell you that training helps prepare them for other opportunities such as lateral moves or promotions; learning to do a better job enables them to derive greater satisfaction from it, and keeps them motivated. What it also does——although many don’t voice it——is show them that their organization cares. If combined with other forms of employee development and strategic initiatives such as reward and recognition programs, training may lead to a greater employeecommitment and desire to stay with the organization.Today's U.S. educational system follows an identical structure. Business and the military imitated the public-school system, and the "modern" training hierarchy was born. Now for the bigger question: Is this 500-year-old format really the most effective way to educate and "train" the postmodern Nintendo Generation of foodservice employees? Maybe it's time to train the trainer and let the learners lead. Here are a few strategies:Training starts during hiring.Once a pool of applicants qualifies as a cultural fit for your team, the focus should be to seek individuals who have the right attitudes toward learning and development. Look for people who are open to and who enjoy learning. Factoring this into the hiring process will save you time and differentiate you from the competition by building a better, stronger, smarter team.You are what you cumulatively know. Every 90 days, scrutinize and assess knowledge gaps and talent gaps across your teams. Hire and develop to fill the gaps.Teach the team how to “read." Train your teams on commonly overlooked basic skills, such as how to read a paycheck, a simple P&L or even wine labels.Training is not development. Training is sharing new skills or concepts via a live or electronic facilitator.Development is applying and then improving on the new skills back on the job with a guide or mentor. A trainer can light the fire, and the manager keeps the flame fanned. Every supervisor is constantly training employees by their own actions.All trainers teach, but not all trainers are teachers. Just because you've taught it, doesn't mean that anyone has "caught" it. The majority of foodservice training today overlooks or underemphasizes the critical skills that matter most, such as problem-solving, conflict resolution, creativity, group dynamics, instilling values, team-building and situational leadership.Your core content was not designed by credentialed educators. The truth is that 99.9 percent of foodservice training manuals and curriculum has been written, formatted and rewritten by former servers, bartenders, hosts, managers or concept founders. They may have excelled at their jobs, but most had no formal education onhow brains work or adults learn. An owner or franchisor’s primary motivation relative to training is to cover compliance issues. Why? Because that's what you test and then keep in their file to minimize the risk of future litigation.Doing your own needs assessmentMaybe you don’t need to be convinced that training can create value. Instead, your problem might be in deciding what training your staff needs, and how it should be offered. Training can be an expensive proposition and perhaps you’ve seen too many unsuccessful programs in your day. You many even think it best to turn the entire chore over to a consultant. However, you know your organization better than any consultant does. You know your goals and objective, and what it takes to achieve them, you know your people best, and understand what is involved in their professional fulfillment. It makes sense that you be the primary decision-maker on training content.Training should be a response to a need, to a specific type of problem, not a competitive gesture or a way to jump on the bandwagon with trendy topics. Begin by asking these questions: What would it take for the organization to better meet its goals? What would give us a competitive edge? Why aren’t employees more productive? What do we need to know more about? What do the really successful people have that other people do not? How big the gap between what is should be and what is? The answer to these questions can be found in several different ways: a focused management meeting; small staff meetings; walking around your organization with a notebook and writing down everything you see; talking a look at employee performance appraisals, and talking to your customers.Renew the information you’ve gathered and try to determine in which area training may be the answer to a particular problem. Keep in mind that training works best when one needs knowledge or skill and is fairly motivated to get it. If you find that your organization is full of people who know what they’re doing but lack the enthusiasm to do it well or to improve on the methods they use, perhaps you have a morale problem and the answer may lie in reward and recognition programs rather than training. Similarly, if production is down and turnover is high, maybe the issue ispoor hiring and selection, and again, training won’t resolve it.Once you know that training could well be the answer, try to narrow it down further by dividing your needs into technical, technological and management practice, Technical and technological skills are usually the first ones to be taken care of because, without them, it is really different to get the job done. Do not ignore the importance of management skills. They improve employee morale, help teams function more effectively and help employees develop as they look for new challenges.Ways to offer trainingThere are three basic ways to offer training: your organization can develop and deliver the training material; you can hire an outsider to develop and deliver the material or you can hire an outsider to develop the material but have someone within your organization deliver it . (When a very limited number of people in the organization need a particular type of training, you may consider employing a coach or sending those individuals to a public seminar.) The biggest advantage to developing and delivering your own material is that it is usually the least costly way (out-of-pocket costs) and it is tuned o your unique organizational needs. The primary disadvantage is the possible lack of training expertise among your employees, as well as the time involved.Buying the design and delivery should ensure subject matter accuracy as well as training expertise. However, the extent to which the trainer is willing or able to customize the program to your industry in general, and to your organization in particular, may be a problem.Finally, there’s an alternative that few organizations conside r: the organization makes a list of the required knowledge and skills. The trainer then considers other related principles/topics and creates a training program that includes lecture material, learning exercises, checklists and notes for the instructor. The instructor is a member of the organization who knows first hand what the company struggles with. He or she knows what can be done, what will never work, and so on. He or she also has the credibility, in the eyes of the participants, of someone who has been there and who has succeeded. R elated to this way of offering training is buying an “off the shelf”program. This is a standard package containing lecture notes, exercises and references. The job of customization is up to you.Make your final decision about the best way to offer training by considering available time, expertise, budget, and need for customization.Ensuring the success of trainingYou’ve determined what kind of training you need and have yourself produced a good program or employed an expert to do this; the problem is with what happens next——or to be more precise, what doesn’t happen. The staff attends the training, and enjoys it (you have the evaluation forms to prove it) but nothing really changes back on the job.You may have seen some of the items in the following list, thought they made sense, but never took the time to put them into practice. Make a vow that this time will be different. If you can’t tackle the whole list at once, try half the items this time and the other half when you see things improving.·Be selective in choosing who attends training; create the aura that it is a privilege to be chosen, not something that everyone must do; choose people who need the information and who’ll have the opportunity to use what they have learned very soon, if not immediately, after they attend the session.·Give participants and managers as say in the content of the content of the training; insist that the developer meet with or send a questionnaire to a representative group. ·Insist that managers attend and participate in portions of the training; managers may act as instructors or participants.·Require participants and their managers to discuss(and document) what will be covered in the training and how it will be used in their specific job. This “contract” should be reviewed by both the manager and employee immediately after the training to see if the plan is still realistic and to make necessary changes.· Follow-up must be built into the program and can take on a variety of forms: trainers returning for additional workshops, periodic checks on the contract established before the training, study groups amongst participants, the opportunity to train others. ·Positive reinforcement for what has been transferred to the job and done well isessential. It can make the different between the materials being used or being forgotten.Good training takes time and energy. Look at what has and hasn’t worked in the past. Need some help? By all means, consider a consultant. But don’t make the mistake of handing the entire job to someone outside the organization. While consultants have a lot to offer, don’t deprive your training participants of your own knowledge and skill.译文：没有培训就难以获利卡罗琳科恩员工培训是吸引并留住员工的关键因素之一，是企业界的常谈话题：“你的公司提供怎样的培训？你们公司就培训方面在每个员工身上的花费是多少？是的，我喜欢那样的培训计划，可是这并不能改变在工作上我如何做事。

本科毕业设计(论文) 外文翻译（附外文原文）系 ( 院 )：资源与环境工程系课题名称：英文翻译专业(方向)：环境工程班级：2004-1班学生：3040106119指导教师：刘辉利副教授日期：2008年4月20使用褐煤（一种低成本吸附剂）从酸性矿物废水中去除和回收金属离子a. 美国, 大学公园, PA 16802, 宾夕法尼亚州立大学, 能源部和Geo 环境工程学.b. 印度第80号邮箱, Mahatma Gandhi ・Marg, Lucknow 226001, 工业毒素学研究中心, 环境化学分部,于2006 年5月6 日网上获得，2006 年4月24 日接受，2006 年3月19 日;校正，2006 年2月15 日接收。

摘要酸性矿物废水(AMD), 是一个长期的重大环境问题，起因于钢硫铁矿的微生物在水和空气氧化作用, 买得起包含毒性金属离子的一种酸性解答。

这项研究的主要宗旨是通过使用褐煤（一种低成本吸附剂）从酸性矿水(AMD)中去除和回收金属离子。

褐煤已被用于酸性矿水排水AMD 的处理。

经研究其能吸附亚铁, 铁, 锰、锌和钙在multi-component 含水系统中。

研究通过在不同的酸碱度里进行以找出最适宜的酸碱度。

模拟工业条件进行酸性矿物废水处理, 所有研究被进行通过单一的并且设定多专栏流动模式。

空的床接触时间(EBCT) 模型被使用为了使吸附剂用量减到最小。

金属离子的回收并且吸附剂的再生成功地达到了使用0.1 M 硝酸不用分解塔器。

关键词:吸附; 重金属; 吸附; 褐煤; 酸性矿物废水处理; 固体废料再利用; 亚铁; 铁; 锰。

文章概述1. 介绍2. 材料和方法2.1. 化学制品、材料和设备3. 吸附步骤3.1. 酸碱度最佳化3.2. 固定床研究3.2.1 单一栏3.2.2 多栏4. 结果和讨论4.1. ZPC 和渗析特征4.2 酸碱度的影响4.3. Multi-component 固定吸附床4.3.1 褐煤使用率4.4. 吸附机制4.5. 解吸附作用研究5. 结论1. 介绍酸性矿物废水(AMD) 是一个严重的环境问题起因于硫化物矿物风化, 譬如硫铁矿(FeS2) 和它的同素异形体矿物(α-FeS) 。

译文Apache Struts 2“Apache Struts 2 is an elegant, extensible framework for creating enterprise-ready Java web applications. The framework is designed to streamline the full development cycle, from building, to deploying, to maintaining applications over time” -The Apache Software Foundation.4.1简介Struts是Apache的一个应用于Java Web的网络编程的开源框架。

Struts框架的创造者和发起者是McClanahan。

后来在2002年，Struts框架由Apache软件基金会收购和接管。

Struts 提供给程序员一个易于组织基于JSP和Servlet的HTML格式和Java代码的框架。

Struts1几乎能与所有标准的Java技术和Jakarta配置包协同工作。

然而,随着需求的不断增长，Struts1在网络应用程序暴露出来许多问题,所以为了满足需求，导致Strut2推出,Strut2能更好地为开发者提供服务,如 Ajax、高效开发和可扩展性。

4.1.1 Struts 2的起源自从2000年Apache Struts的发起,Struts框架取得了非常大的成功,被大多数标准所接纳,得到了很大的发展,如果不是这样,哪里会有今天java web程序的成绩。

它的历史,告诉我们Struts是怎样组织JSP和/ Servlets，而提供了固定的框架。

Struts融入server-generated HTML与Javascript,客户端验证,也使得开发比较容易和维护。

随着时间推进的和客户对web 需求扩大,网站应用程序取得硕果累累,Struts1太老了，开始在越来越多的网站前端开发者视野中淡去。

土木工程学院交通工程专业中英文翻译Road Design专业：交通工程英文原文The Basics of a Good RoadWe have known how to build good roads for a long time. Archaeologists have found ancient Egyptian roadsthat carried blocks to the pyramids in 4600 BCE. Later,the Romans built an extensive road system, using the same principles we use today. Some of these roads arestill in service.If you follow the basic concepts of road building, you will create a road that will last. The ten commandments of a good road are:（1）Get water away from the road（2）Build on a firm foundation（3）Use the best materials（4）Compact all layers properly（5）Design for traffic loads and volumes（6）Design for maintenance（7）Pave only when ready（8）Build from the bottom up（9）Protect your investment（10）Keep good records1．Get water away from the roadWe can’t overemphasize the importance of good drainage.Engineers estimate that at least 90% of a road’s problems can be related to excess water or to poor waterdrainage. Too much water in any laye r of a road’sstructure can weaken that layer, leading to failure.In the surface layer, water can cause cracks and potholes. In lower layers it undermines support, causing cracks and potholes. A common sign of water in an asphalt road surface is alligator cracking — an interconnected pattern of cracks forming small irregular shaped pieces that look like alligator skin. Edge cracking, frost heaves, and spring breakup of pavements also point to moisture problems.To prevent these problems remember that water:• flows downhill• needs to flow someplace• is a problem if it is not flowingEffective drainage systems divert, drain and dispose of water. To do this they use interceptor ditches and slopes,road crowns, and ditch and culvert systems.Divert —Interceptor ditches, located between the road and higher ground along the road, keep the water from reaching the roadway. These ditches must slope so they carry water away from the road.Drain —Creating a crown in the road so it is higher along the centerline than at the edges encourages water to flow off the road. Typically a paved crown should be 1⁄4" higher than the shoulder for each foot of width from the centerline to the edge. For gravel surfaces the crownshould be 1⁄2" higher per foot of width. For this flow path to work, the road surface must be relatively water tight. Road shoulders also must be sloped away from the road to continue carrying the flow away. Superelevations (banking) at the outside of curves will also help drainthe road surface.Dispose —A ditch and culvert system carries water away from the road structure. Ditches should be at least one foot lower than the bottom of the gravel road layer that drains the roadway. They must be kept clean and must be sloped to move water into natural drainage. If water stays in the ditches it can seep back into the road structure and undermine its strength. Ditches should also be protected from erosion by planting grass, or installing rock and other erosion control measures. Erosion can damage shoulders and ditches, clog culverts, undermine roadbeds, and contaminate nearby streams and lakes. Evaluate your ditch and culvert system twice a year to ensure that it works. In the fall, clean out leaves and branches that can block flow. In spring, check for and remove silts from plowing and any dead plant material left from the fall.2．Build on a firm foundationA road is only as good as its foundation. A highway wears out from the top down but falls apart from the bottom. The road base must carry the entire structure and the traffic that uses it.To make a firm foundation you may need to stabilize the roadbed with chemical stabilizers, large stone called breaker run, or geotextile fabric. When you run into conditions where you suspect that the native soil is unstable, work with an engineer to investigate the situation and design an appropriate solution.3．Use the best materialsWith all road materials you “pay now or pay later.” Inferior materials may require extensive maintenance throughout the road’s life. They may also force you to replace the road prematurely.Crushed aggregate is the best material for the base course. The sharp angles of thecrushed material interlock when they are compacted. This supports the pavement and traffic by transmitting the load from particle to particle. By contrast, rounded particles act like ballbearings, moving under loads.Angular particles are more stable than rounded particles.Asphalt and concrete pavement materials must be of the highest quality, designed forthe conditions, obtained from established firms, and tested to ensure it meets specifications.4．Compact all layersIn general, the more densely a material is compacted, the stronger it is. Compaction also shrinks or eliminates open spaces (voids) between particles. This means that less water can enter the structure. Water in soil can weaken the structure or lead to frost heaves. This is especially important for unsurfaced (gravel) roads. Use gravel which has a mix of sizes (well-graded aggregate) so smaller particles can fill the voids between larger ones. Goodcompaction of asphalt pavement lengthens its life.5．Design for traffic loads and volumesDesign for the highest anticipated load the road will carry. A road that has been designed only for cars will not stand up to trucks. One truck with 9 tons on a single rear axle does as much damage to a road as nearly 10,000 cars.Rural roads may carry log trucks, milk trucks, fire department pumper trucks, or construction equipment. If you don’t know what specific loads the road w ill carry, a good rule of thumb is to design for the largest piece of highway maintenance equipment that will be used on the road.A well-constructed and maintained asphalt road should last 20 years without major repairs or reconstruction. In designing a road, use traffic counts that project numbers and sizes of vehicles 20 years into the future. These are only projections, at best, but they will allow you to plan for traffic loadings through a road’s life.6．Design for maintenanceWithout maintenance a road will rapidly deteriorate and fail. Design your roads so they can be easily maintained. This means:• adequate ditches that can be cleaned regularly• culverts that are marked for easy locating in the spring• enough space for snow after it is plowed off the road• proper cross slopes for safety, maintenance and to avoid snow drifts• roadsi des that are planted or treated to prevent erosion• roadsides that can be mowed safelyA rule of thumb for adequate road width is to make it wide enough for a snowplow to pass another vehicle without leaving the travelled way.Mark culverts with a post so they can be located easily.7．Pave only when readyIt is not necessary to pave all your roads immediately. There is nothing wrong with a well-built and wellmaintained gravel road if traffic loads and volume do not require a paved surface. Three hundred vehicles per day is the recommended minimum to justify paving.Don’t assume that laying down asphalt will fix a gravel road that is failing. Before youpave, make sure you have an adequate crushed stone base that drains well and is properly compacted. The recommended minimum depth of crushed stone base is 10" depending on subgrade soils. A road paved only when it is ready will far outperform one that is constructed too quickly.8．Ê Build from the bottom upThis commandment may seem obvious, but it means that you shouldn’t top dress or resurface a road if the problem is in an underlying layer. Before you do any road improvement, locate the cause of any surface problems. Choose an improvement technique that will address the problem. This may mean recycling or removing all road materials down to the native soil and rebuilding everything. Doing any work that doesn’t solve the problem is a waste of money and effort.9．Ê Protec t your investmentThe road system can be your municipality’s biggest investment. Just as a home needs painting or a new roof, a road must be maintained. Wisconsin’s severe climate requires more road maintenance than in milder places. Do these important maintenance activities: Surface —grade, shape, patch, seal cracks, control dust, remove snow and iceDrainage —clean and repair ditches and culverts; remove all excess materialRoadside —cut brush, trim trees and roadside plantings, control erosionTraffic service —clean and repair or replace signsDesign roads with adequate ditches so they can be maintained with a motor grader. Clean and grade ditches to maintain proper pitch and peak efficiency. After grading, remove all excess material from the shoulder.10．Keep good recordsYour maintenance will be more efficient with good records. Knowing the road’s construction, life, and repair history makes it much easier to plan and budget its future repairs. Records can also help you evaluate the effectiveness of the repair methods and materials you used.Good record keeping starts with an inventory of the system. It should include the history and surface condition of the roadway, identify and evaluate culverts and bridges, note ditch conditions, shoulders, signs, and such structures as retaining walls and guardrails.Update your inventory each year or when you repair or change a road section. A formal pavement management system can help use these records and plan and budget road improvements.ResourcesThe Basics of a Good Road#17649, UW-Madison, 15 min. videotape. Presentsthe Ten Commandments of a Good Road. Videotapes are loaned free through County Extension offices.Asphalt PASER Manual(39 pp), Concrete PASER Manual (48 pp), Gravel PASERManual (32 pp). These booklets contain extensive photos and descriptions of road surfaces to help you understand types of distress conditions and their causes. A simple procedure for rating the condition helps you manage your pavements and plan repairs.Roadware, a computer program which stores and reports pavement conditioninformation. Developed by the Transportation Information Center and enhanced by the Wisconsin Department of Transportation, it uses the PASER rating system to providefive-year cost budgets and roadway repair/reconstruction priority lists.Wisconsin Transportation Bulletin factsheets, available from the Transportation Information Center (T.I.C.).Road Drainage, No. 4. Describes drainage for roadways, shoulders, ditches, and culverts.Gravel Roads, No. 5. Discusses the characteristics of a gravel road and how to maintain one.Using Salt and Sand for Winter Road Maintenance,No. 6. Basic information and practical tips on how to use de-icing chemicals and sand.Culverts—Proper Use and Installation, No. 15. Selecting and sizing culverts, designing, installing and maintaining them.Geotextiles in Road Construction/Maintenance andErosion Control, No. 16. Definitions and common applications of geotextiles onroadways and for erosion control.T.I.C. workshops are offered at locations around the state.Crossroads,an 8-page quarterly newsletter published by the T.I.C. carries helpfularticles, workshop information, and resource lists. For more information on any of these materials, contact the T.I.C. at 800/442-4615.中文译文一个良好的公路的基础长久以来我们已经掌握了如何铺设好一条道路的方法，考古学家发现在4600年古埃及使用建造金字塔的石块铺设道路，后来，罗马人使用同样的方法建立了一个庞大的道路系统，这种方法一直沿用到今天。

外文翻译（原文）Catalytic wet peroxide oxidation of azo dye (Congo red) using modified Y zeolite as catalystAbstractThe present study explores the degradation of azo dye (Congo red) by catalytic wet peroxide oxidation using Fe exchanged commercial Y zeolite as a catalyst. The effects of various operating parameters like temperature, initial pH, hydrogen peroxide concentration and catalyst loading on the removal of dye,color and COD from an aqueous solution were studied at atmospheric pressure. The percent removals of dye, color and COD at optimum pH07, 90◦C using 0.6 ml H 2 O2/350 ml solution and 1 g/l catalyst was 97% (in 4 h), 100% (in 45 min) and 58% (in 4 h), respectively. The % dye removal has been found to be less in comparison to % color removal at all conditions, e.g. dye removal in 45 min and at above conditions was 82%, whereas the color removal was 100%. The results indicate that the Fe exchanged Y zeolite is a promising catalyst for dye removal. Fe exchanged catalyst is characterized using XRD, SEM/EDAX, surface area analyzer and FTIR. Though the dye, color and COD removals were maximum at pH02 but as the leaching of Fe from the catalyst was more in acidic pH range, pH0 7 was taken as operating pH due to almost comparable removals as of pH0 2 and no leaching of Fe ions.© 2008 Elsevier B.V. All rights reserved.1. IntroductionReactive azo dyes from textile and dyeing industries pose grave environmental problem. An estimate shows that textiles account for 14% of India’s industrial production and around 27% of its export earnings[1]. Production during 2006 registered a growth of about 3.5% at 29,500 tonnes and the textile industry accounts for the largest consumption of dyestuffs at nearly 80% [2]. The waste containing these azo dyes is non-degradable. The process of dyeing is a combination of bleaching and coloring, which generates huge quantities of wastewaters causing environmental problems. The effluents from these industries consist of large quantities of sodium, chloride, sulphate, hardness, carcinogenic dye ingredients and total dissolved solids with very high BOD and COD values over 1500 mg/l and over 5000 mg/l, respectively [3]. Various methods have been used for dye removal like adsorption, coagulation, electrocoagulation, Fenton’s reagent and combination of these processes. Though these treatment processes are efficient in dye removal, they generate adsorbed waste/sludge, etc. which further causes a secondary pollution. In wet oxidation the sludge is disposed off to a great extent by oxidizing the organic pollutant. Catalytic wet oxidation method (CWAO and CWPO) is gaining more popularity. CWPO process using H2O2, in particular has advantages like better oxidation ability thanusing oxygen,as the former is carried out at lower pressure (atmospheric pres-sure).WAO usually acts under high temperatures (200–325◦C)and pressure (50–150 bar). A comparable oxidation efficiency is obtained at a less temperature of 100–120◦C when using hydrogen peroxide as the oxi dizing agent instead of oxygen [4].WAO is capital intensive whereas WPO needs limited capital but generates little higher running costs [4].Rivas et al.[5] showed that the addition of H2O2(as a source of free radicals) enhanced wet air oxidation of phenol, a highly non-degradable substance and found that the combined addition of H2O2 and a bivalent metal (i.e. Cu, Co or Mn) enhanced the rate of phenol removal. Various oxidation catalysts have been studied for the removal of different compounds like phenol, benzoic acid, dyes, etc. by CWPO process. Catalysts like Fe2O3/CeO2and WO3/CeO2 in the removal of phenolic solution, (Al–Fe) pillared clay named FAZA in the removal of 4-hydroxy benzoic acid, mixed (Al–Fe) pillared clays in the removal of organic compounds have been used[6–8] .Removal of dyes by CWPO process is gaining importance in recent times with a large number of catalysts. Kim and Lee [9] used Cu/Al2O3 and copper plate in treatment of dye house effluents. Liu and Sun [10] removed acid orange 52, acid orange 7 and reactive black 5 using CeO2doped Fe2O3/ -Al2O3 from dye waste water. Kim and Lee [11] reported the treatment of reactive dye solutions by using Al–Cu pillared clays as catalyst.Among these catalysts, modified zeolites are preferred for improved efficiency, lower by-product formation and less severe experimental conditions (temperatures and pressures). Theimproved efficiency of the catalyst is ascribed to its structure and large surface area with the ability of forming complex compounds. Zeolites can be ion exchanged using transition metal ions like Fe,Cu, Mn and others like Ca, Ba, etc. Zeolites are negatively charged because of the substitution of Si(IV) by Al(III) in the tetrahedral accounts for a negative charge of the structure and hence the Si/Al ratio determines the properties of zeolites like ion exchange capacity [12] . These metal ions neutralizethe negative charge on zeolites and their position, size and number determine the properties of zeolite. These metal ions are fixed to the rigid zeolite framework which prevents leaching and precipitation in various reactions[13–21] .In this work, catalytic wet peroxide oxidation of Congo red azo dye using Fe exchanged Y zeolite has been presented. Effect of variables like temperature, initial pH, peroxide concentration and catalyst loading on catalytic wet peroxide oxidation were examined and the optimum conditions evaluated.2.Materials and methods2.1. ChemicalsHydrogen peroxide (30% analytical grade), manganese dioxide,sodium hydroxide pellets (AR) and hydrochloric acid were obtained from RFCL limited (Mumbai), India. Congo red was obtained from Loba Chemie Pvt. Ltd. (Mumbai) and were obtained from RFCL limited (Mumbai), India.Commercial Na–Y zeolite was obtained from Sud chemie Pvt.Ltd. (Baroda), India. Commercial catalyst was iron exchanged with excess 1 M Fe(NO3)3 at 80◦C for 6 h. The process was repeated three times and the sample was thoroughly washed with distilled water and dried in oven in air at60◦C for 10-12 h. The amount of iron exchanged was 1.53 wt% estimated by A.A.S.2.2. Apparatus and procedureThe experimental studies were carried out in a 0.5 l three-necked glass reactor equipped with a magnetic stirrer with heater and a total reflux (Fig. 13). Water containing Congo red dye was transferred to the three-necked glass reactor. Thereafter, the catalyst was added to the solution. The temperature of the reaction mixture was raised using heater to the desired value and maintained by a P.I.D. temperature controller, which was fitted in one of the necks through the thermocouple. The raising of the temperature of the reaction mixture to 90◦C from ambient took about 30 min.The total reflux prevents any loss of vapor and magnetic stirrer to agitate the mixture. Hydrogen peroxide was added, the runs were conducted at 90◦C and the samples were taken at periodic intervals. The samples after collection were raised to pH-11 by adding 0.1N NaOH (so that no further reaction takes place) and the residual hydrogen peroxide was removed by adding MnO2 which catalyzed the decomposition of peroxide to water and oxygen. The samples were allowed to settle for overnight or one day (or centrifuged) and filtered. The supernatant was tested for color and COD. After the completion of the run, the mixture was allowed to cool and settle overnight.2.3. CharacterizationThe determination of structure of the heterogeneous catalyst was done by X-ray diffractometer (Bruker AXS, Diffraktometer D8,Germany). The catalyst structure was confirm ed by using Cu Kα as a source and Ni as a filter. Goniometer speed was kept at 1cm/min and the chart speed was 1 cm/min. The range of scanning angle(2θ) was kept at 3–60◦. The intensity peaks indicate the values of2θ , where Bragg’s law is applicable. The formation of compounds was tested by comparing the XRD patternusing JCPDS files (1971).The determination of images and composition of catalyst were done by SEM/EDAX QUANTA 200 FEG. Scanning for zeolite samples was taken at various magnifications and voltage to account for the crystal structure and size. From EDAX, the composition of the elements in weight percentage and atomic percentage were obtained along with the spectra for overall compositions and particular local area compositions. BET surface area of the samples was analyzed by Micromeritics CHEMISORB 2720. The FTIR spectra of the catalyst was recorded on a FTIR Spectrometer (Thermo Nicolet, USA, Software used: NEXUS) in the 4000–480 cm−1wave number range using KBr pellets. The internal tetrahedra and external linkage of the zeolites formed are identified and confirmed by FTIR. The IR spectra data in Table 2 is taken from literature[22] .2.4. AnalysisThe amount of the dye present in the solution was analyzed by direct reading TVS 25 (A) Visible Spectrophotometer. The visible range absorbance at the characteristic wavelength of the sample at 497 nm was recorded to follow the progress of decolorization during wet peroxide oxidation.The COD of the dye solution was estimated by the Standard Dichromator Closed Reflux Method (APHA-1989) using a COD analyzer (Aqualytic, Germany). The color in Pt–Co unit was estimated using a color meter (Hanna HI93727, Hanna Instruments, Singapore) at 470 nm and the pH was measured using a Thermo Orion, USA make pH meter. The treated dye solutions were centrifuged (Model R24, Remi Instruments Pvt. Ltd., Mumbai, India) to obtain the supernatant free of solid MnO2.A.A.S (Avanta GBC, Australia) was used to find the amount of iron exchanged and leached.3. Results and discussionDue to the iron present after the exchange process, the Y peaks diminished along with the rise in Fe peaks. Similar phenomena has also been observed by Yee and Yaacob [23] who obtained zeolite iron oxide by adding NaOH and H2O2(drop wise) at 60◦C to Na–Y zeolite. XRD pattern ( Fig. 2) showed diminishing zeolite peaks along with evolution of peaks corresponding to y-Fe2O3 with increasing NaOH concentration. The IR assignments from FTIR (Fig. 3) remain satisfied even after iron exchanging. The EDAX data (Table 1) show clearly an increase in the value of Fe conc. after ion exchange of Y-zeolite. The BET surface area (Table 1) has been found to decrease from 433 to 423 m2/g after Fe exchange. SEM image is shown in Fig. 1 . Table 2 presents FTIR specifications of zeolites (common to all zeolites).The effect of temperature, initial pH, hydrogen peroxide concentration and catalyst loading on catalytic wet peroxide oxidation of azo dye Congo red were investigated in detail.Fig. 1. SEM image of Fe-exchanged Y zeolite.Fig. 2. XRD of commercial and Fe-exchanged commercial Y zeolite.BET surface area (commercial Na–Y): 433.4 m2/g.BET surface area (Fe exchanged commercial Na–Y): 423 m2/g.Table 2Zeolite IR assignments (common for all zeolites) from FTIR.3.1. Effect of temperature on dye, color and COD removalThe temperatures during the experiments were varied from50◦Cto100◦C. A maximum conversion of dye of 99.1% was observed at 100◦C in 4 h (and 97% at 90◦C). The dye rem ovals at 80◦C, 70◦C, 60◦C and 50◦C and at 4 h are 56%, 52%, 42% and 30%,respectively. Fig. 4 shows that at a particular temperature, the dye concentration gradually decreases with time. The initial red color of the dye solution decreased into brown color in due course and finally the brown color disappeared into a colorless solution. Dye concentration decreases at faster rates with temperatures for initial 30 min and thereafter it decreases from 1 h to 2 h. The initial concentrations of dye did not change after a brief contact period of dye solution with the Fe-exchanged zeolite catalyst (before CWPO)confirming that there is negligible adsorption of the dye by the catalyst.Fig. 5 shows the results obtained for color removal as a function of time and temperature. The maximum color removal (100%) is obtained at 100◦C in 30 min and also at 90◦C in 45 min. At a particular temperature, the color continuously decreases with time atFig. 3. FTIR of Fe-exchanged Y zeolite.Fig. 4. % dye removal as function of temperature.faster rate in first few minutes until a certain point ( t = 45 min) and then remaining almost unchanged. At 50◦C, the color removal is very low, whereas at 60◦C, there is a sudden shift towards its greater removal. The color removal is much higher at higher temperatures(70–100◦C).Fig. 6 depicts the results obtained for %COD removal as a function of time and temperature. A maximum COD removal of 66% was obtained at 100◦C (at 4 h) followed by 58% at 90◦C (at 4 h). Until60◦C, the rate of COD removal is less and during 70–100◦C, the rate is much faster.3.2. Effect of initial pH on dye, color and COD removalThe influence of initial pH on dye (Congo red) removal was studied at different pH (pH0 2, 4, 7, 8, 9 and 11) without any adjustment of pH during the experiments. A maximum conversion of 99% was obtained at pH0 2 followed by 97% at pH0 7. The dye removal at pH0 4, 8, 9 and 11 were 94%, 29%, 5% and 0.6%, respectively. All the runs were conducted for 4 h duration. The color of the solution is violet blue at pH0 2 (a colloidal solution) and greenish blue at pH0 4 (colloidal solution). In neutral and basic pH0(7, 8, 9 and 11) range, color of the solution did not change during treatment and was same as original solution, i.e. red color. Fe cations can leach out from zeolite structure into the solution causing secondary pollution. Leaching of Fe cations out of zeolitesFig. 5. % color removal as function of temperature.Fig. 6. %COD removal as function of temperature.Fig. 7. % color removal as function of pH0depends strongly on pH of the solution. The leaching of iron ions was enhanced at low pH values [24,25] . In order to determine dissolved Fe concentration, final pH values of the solutions were analyzed by A.A.S. At initial pH0 2 and 4, Fe detected in the solution was 7.8 ppm and 3.9 ppm, respectively. At pH0 7 and in alkaline range, there wasFig. 8. %COD removal as function of pH0.Fig. 9. % color removal as function of peroxide concentration.Fig. 10. %COD removal as function of peroxide concentration.almost no leaching. pH0 7, therefore, was chosen to be optimum pH for future experiments. The final pH values pH f after the reaction corresponding to pH0 2, 4, 6, 8, 9 and 11 were 2.1, 4.2, 7.2, 7.7 and 8.7, respectively. This show that the pH f tend to reach to neutral pH for all starting pH values.Fig. 7 presents the results obtained for color removal as a function of time and pH0. A maximum color removal of 100% was obtained at pH0 2 (in 10 min) and also at pH0 7 (in 45 min). The color removal at a particular pH0 decreases at a faster rateinitially (0–1 h) and thereafter it has a slower rate. The lowest removal was observed at pH0 11 with almost no removal.Fig. 11. % color removal as function of catalyst loading.Fig. 12. %COD removal as function of catalyst loading.The results obtained for COD removal as a function of time and pH0 are shown in Fig. 8 . A maximum COD removal of 69% was obtained at pH0 2 in 4 h followed by 63% at pH0 4 and 58% at pH0 7in4h.Fig. 8 shows maximum decrease in COD value in the initial 30 mines at all pH0. The decrease in COD is not appreciable thereafter. The COD removal is more in acidic range with a maximum removal of 69%, moderate in neutral region and least in basic region.3.3. Effect of peroxide concentration on dye, color and COD removalThe influence of H2O2 concentration on dye removal was investigated at different concentrations of hydrogen peroxide (in the range 0–6 ml). A maximum removal of 99.02% was obtained at H2O2 concentration of 3 ml per 350 ml of solution, followed by 98.3% at 1ml and 97% at 0.6 ml. The dye removal at H2O2concentrations of 6 ml,0.3 ml and 0 ml (and at 4 h) were 94%, 82% and 8%, respectively. The dye removal rate at 90◦C temperature is gradual at all conc entrations of peroxide. At peroxide concentration of 0 ml, there is very little removal of dye, hardly 8%. Hence, it can be inferred that catalytic thermolysis (a process of effluent treatment by heating the effluent with/without catalyst) is not active and cannot be applied for dye removal.At the beginning of the reaction, the OH•radicals which are produced additionally when peroxide concentration is increased,speeds up the azo dye degradation. After a particular peroxide concentration, on further increase of the peroxide, the dye removal isFig. 13. Schematic diagram of the reactor.not increased. This may be because of the presence of excess peroxide concentration, hydroperoxyl radicals (HO2•) are produced from hydroxyl radicals that are already formed. The hydroperoxyl radicals do not contribute to the oxidative degradation of the organic substrate and are much less reactive. The degradation of the organic substrate occurs only by reaction with HO•[26] .The % color removal at a particular peroxide concentration increases at a faster rate in the initial 45 min and then at slower rates afterwards (Fig. 9). As H2O2 concentration increases, the rate of removal is much faster, reaching 100% in 45 minusing 6 ml H2O2 per 350 ml solution, whereas it is 100% in 1 h for both 0.3 ml and3ml.Fig. 10 shows the results obtained for COD removal as a function of time and H2O2 concentration. The maximum COD removal, 63% is obtained for H2O2 conc. 3 ml at 90◦C, pH0 7 and 2 h duration.3.4. Effect of catalyst loading on dye, color and COD removalThe influence of catalyst concentration on dye removal was investigated at different concentrations (in the range 0.5–1.5 g/l). A maximum dye removal of 98.6% was observed at 1.5 g/l followed by 98.3% at 1 g/l and 87.3% at 0.5 g/l in 4 h duration. The % dye removal without catalyst was very low with only 36% dye removal in 4 h. By comparing the results for the dye removal without catalyst and1.5 g/l catalyst, the removal for 1.5 g/l is approximately three times to that of without catalyst. The rate of removal is also more for higher concentrations of catalyst and increases with it.Fig. 11 shows the results obtained for color removal as a function of time and catalyst concentration. The maximum color removal of 100% was obtained using 1.5 g/l catalyst conc. in 1.5 h and also using 1 g/l catalyst in 3 h.Fig. 12 presents the results obtained for %COD removal as a function of time and catalyst concentration. A maximum COD removal of 58% was obtained at catalyst conc. 1 g/l, 51.8% at 1.5 g/l and 50.5% at 0.5 g/l in 4 h. Without catalyst, the COD removal was only 35%.4. ConclusionsThe % removals of dye, color and COD by catalytic wet peroxide oxidation obtained at 100◦C, 4 h duration using 0.6 ml H2O2/350 ml solution, 1 g/l Fe–Y catalyst and pH0 7 were 99.1%, 100% (30 min)and 66%, respectively. As at 100◦C the solution has tendency to vaporize during the operation, 90◦C was taken as operating temperature. The corresponding % removals at 90◦C were 97% dy e, 100%color (in 45 min) and 58% COD. Acidic range gave higher % removals in comparison to neutral and alkaline range. At pH0 2, the dye, color and COD removals of 99%,100% (in 10 min) and 69% were observed after 4 h duration. As at pH0 2, the leaching of Fe ions from Y zeolite catalyst is predominant,pH0 7 was taken as operating pH. Fe concentration of 7.8 ppm was observed in the solution at pH0 2. The values of removals, however,are comparable to pH0 2, with dye removal of 97%, color removal of100% (in 45 min) and COD removal of 58% in 4 h.The H2O2concentration was found to be optimum at 3 ml/350 ml solution giving dye, color and COD removals of 99%,100% (in 1 h) and 63%, respectively.The study on the effect of catalyst loading revealed 1.5 g/l as best among the catalyst concentrations studied. The results with 1 g/l and 1.5 g/l catalyst concentration were almost comparable.外文翻译（译文）使用改性Y沸石为催化剂湿式催化过氧化氢氧化偶氮染料(刚果红)摘要本研究主要探讨了使用改性Y沸石固载铁离子作为催化剂湿式催化过氧化氢氧化降解偶氮染料(刚果红)。

外文文献翻译（附原文）外文译文一：产业集群的竞争优势——以中国大连软件工业园为例Weilin Zhao,Chihiro Watanabe，Charla-Griffy-Brown[J]. Marketing Science,2009(2):123-125.摘要：本文本着为促进工业的发展的初衷探讨了中国软件公园的竞争优势。

产业集群深植于当地的制度系统，因此拥有特殊的竞争优势。

根据波特的“钻石”模型、SWOT模型的测试结果对中国大连软件园的案例进行了定性的分析。

产业集群是包括一系列在指定地理上集聚的公司，它扎根于当地政府、行业和学术的当地制度系统，以此获得大量的资源，从而获得产业经济发展的竞争优势。

为了成功驾驭中国经济范式从批量生产到开发新产品的转换，持续加强产业集群的竞争优势,促进工业和区域的经济发展是非常有必要的。

关键词：竞争优势；产业集群；当地制度系统；大连软件工业园；中国；科技园区；创新；区域发展产业集群产业集群是波特[1]也推而广之的一个经济发展的前沿概念。

作为一个在全球经济战略公认的专家,他指出了产业集群在促进区域经济发展中的作用。

他写道：集群的概念,“或出现在特定的地理位置与产业相关联的公司、供应商和机构，已成为了公司和政府思考和评估当地竞争优势和制定公共决策的一种新的要素。

但是，他至今也没有对产业集群做出准确的定义。

最近根据德瑞克、泰克拉[2]和李维[3]检查的关于产业集群和识别为“地理浓度的行业优势的文献取得了进展”。

“地理集中”定义了产业集群的一个关键而鲜明的基本性质。

产业由地区上特定的众多公司集聚而成,他们通常有共同市场、,有着共同的供应商,交易对象,教育机构和其它像知识及信息一样无形的东西，同样地,他们也面临相似的机会和威胁。

在全球产业集群有许多种发展模式。

比如美国加州的硅谷和马萨诸塞州的128鲁特都是知名的产业集群。

前者以微电子、生物技术、和风险资本市场而闻名,而后者则是以软件、计算机和通讯硬件享誉天下[4]。

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外文原文An Investigation on Turbocharger Turbine Performance Parameters UnderInlet Pulsating FlowTabatabaei HamidrezaDepartment of Mechanic and Aerospace Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14155-4933, Hesarak, Tehran, Iran e-mail:h.tabatabaei@iaukashan.ac.irBoroomand MasoudDepartment of Aerospace Engineering, Amirkabir University of Technology, Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran e-mail: boromand@aut.ac.irTaeibi Rahni MohammadDepartment of Aerospace Engineering, Sharif University of Technology, Azadi Avenue, P.O. Box 11365-11155, Tehran, Iran e-mail: taeibi@sharif.ac.ir Three-dimensional steady and unsteady (pulsating) compressible flows in a vane-less turbocharger turbine of a 1.7 liter SI engine are simulated numerically, and the results are validated experimentally using a turbocharged on-engine test cell. Simulations are carried out for a 720_ engine cycle at three engine speeds, and the complete forms of volute and rotor vanes are modeled. Two ways for modeling the rotating wheel, multiple reference frames (MRF), and sliding mesh (SM) techniques are also examined. Finally, the effects of pulsating flow on the turbocharger turbine performance parameters (TTPP) such as the inlet static pressure, reduced mass flow rate, and efficiency are obtained and compared with their values under steady flow. The results show that the accuracy of steady characteristic map to estimate the TTPPs has some source of ambiguity, which should be considered for detailed analysis. TTPP values under steady flow conditions are found to be significantly deviated from the unsteady results. These deviations are decreased as the engine speed increases. Keywords: computational fluid dynamics, unsteady flow, compressible flow, SI-engine, simulation1 IntroductionThe usual pulsating flow in the exhaust gas of an automotive power train system causes an unsteady flow at the inlet to the turbocharger turbine. In a four cylinder four stroke engine, the pulse frequency varies between 30 to 166 Hz, which is equivalent to an engine speed of 900 to 5000 rpm. The turbocharger turbine is usually tested under steady flow by manufacturers and characteristic curves of turbines do not match with the TTPPs because the mass flow rate, pressures, and temperatures vary with time. There are several ways to evaluate the TTPPs: (i) The experimental method, which is very expensive and lengthy and is recommended only for validation of calculations. (ii) The 1D unsteady flow simulation, which uses the steady flow characteristic map of the turbine and requires considerable attention in modeling real 3D phenomena in a 1D environment. (iii) The 3D steady flow simulation, which ignores the pulsating flow effects. (iv) Finally, the 3D unsteady (pulsating) flow simulation, which is more practical compared with the above mentioned methods, as it will be shown in this report.Several investigations have been performed about the turbine performance under inlet pulsating flow. Capobianco and Gambarotta [1] used a small turbocharger engine and measured the power of turbine under the pulsating flow and concluded that the efficiency was 15–20% higher than that under steady flow. Arcoumanis et al. [2] showed that the pulse-turbocharged systems producing a turbine operating environment is dominated by unsteady flow and that the mechanical inertia of the shaft and wheels serves to hold rotational speed nearly constant. Chen et al. [3] indicated that the unsteady model is better for predicting the turbine flow behavior than a quasi-study model. Elrich [4] performed extensive measurements on a six cylinder diesel engine to analyze the on engine turbine performance. The experiments showed that the flow velocity, temperature, and pressure within the exhaust manifold and turbine propagate with different velocities. Arcoumanis et al. [5] derived instantaneous efficiency for a mixed-flow turbine using two different methods of phase shifting. Results showed that the method used for phase shifting has a significant effect on the derived instantaneous efficiency, and the cycle averaged isentropic efficiencies were higher for a mixed-flow turbine compared to a radial turbine. Hu and Lawless [6] developed a turbine model, but were not able to show any relationship between the simulations and Ehrlich’s measurements. Lam et al. [7] did a complete 3D CFD calculation of unsteady flow in a radial turbocharger turbine. They showed that the pulse amplitude is damped quite heavily through the volute and nozzle vanes. Costall et al. [8] and Rajoo and Martinez-Botas [9] studied the instantaneous efficiency of a mixed flow turbine under pulsating flow and presented a good correlation between the pressures measured at different locations of the turbine. Hellstrom and Fuchs [10] modeled pulsating and nonpulsating 3D flows in the turbine part of the radial turbocharger using Reynolds averaged Navier-Stokes (RANS) and large eddy simulations (LES). Capobianco and Marelli [11] carried out an experimental investigation into a small turbocharger turbine fitted with a waste-gate valve. The turbine performance was measured under both steady and unsteady flow operation. Particular attention was given to pulsating flow performance evaluated using the instantaneous parameters. The effect of flow unsteadiness on turbine behavior was analyzed. Copeland et al. [12] presented the experimental performance evaluation of a circumferentially divided, double-entry turbocharger turbine. One of the principal objectives was to assess the degree to which the unsteady performance differs from the quasi-steady assumption. Chiong et al. [13] presented the appropriate inlet boundary conditionm settings for turbocharger turbine unsteady performance prediction using 1D modeling without the full access to pulsating engine exhaust flow parameter. All boundary conditions showed acceptable unsteady turbine nondimensional parameter prediction, particularly the hysteresis of unsteady turbine swallowing capacity performance. Macek and Vitek [14] developed a tool improving the accuracy of turbocharger turbine simulation during matching of a turbocharger to an engine. Rajoo and Martinez- Botas [15] showed a turbocharger turbine with a nozzle behaving differently from a nozzle-less turbine under pulsating flow.The present report is focused on the simulation of the turbine performance under 3D steady and unsteady compressible flow, and the results are validatedexperimentally. The rotating wheel is modeled using multiple reference frames and sliding mesh techniques.2 Model Setup2.1 Turbine Geometry . A vane-less turbocharger turbine of a 1.7 liter SI engine is modeled at three operating engine speeds of 998, 2500, and 5000 rpm. Table 1 showsthe main geometric parameters of the turbine.The CAD model of the turbocharger turbine, which was prepared by CatiaVersion 5R18 and modified by Ansys Design Modeler V12.0, is shown in Fig. 1. The turbine is comprised of both solid (turbine blades) and fluid regions. The gap betweenthe turbine rotor vanes and the shroud is neglected.2.2 Turbine Efficiency Calculations. The instantaneous turbine efficiency is varied and becomes pulsating at the turbine inlet and is defined as(1.1) ,,()()a tur is tur w t t η∙∙=And the mean efficiency of the turbine is defined as (1.2) The instantaneous actual power is defined as(2)The instantaneous isentropic turbine power is defined as (3)The mean values of _p c and _γare calculated as average values for the working temperature range of the turbine.The mean values of actual and isentropic turbine powers are defined as(4)(5)3 Numerical Modeling3.1 Governing Equations. The unsteady conservation form of mass, momentum, and energy equations in stationary frame of reference are as follows:__,,_,a turis tur is tur w wη∙∙=,()()a tur w t t ωτ∙=__1_,0,0,()()()()1()out in in tur is tur tur p tur tur P t w t m t c T t P t γγ-∙∙⎡⎤⎢⎥⎛⎫⎢⎥=- ⎪ ⎪⎢⎥⎝⎭⎢⎥⎣⎦____1_____0,,_0,()()()1()out in in tur tur is tur tur p tur P t w m t c T t P t γγ-∙∙⎡⎤⎢⎥⎛⎫⎢⎥ ⎪=-⎢⎥ ⎪⎝⎭⎢⎥⎢⎥⎣⎦_1,()a tur t t w t dtωτ∙=∆∆⋅⎰ρ∂(6)(7) (8)Where the stress tensor is related to the strain rates by(9) And the source term of momentum, is M S expressed byThe source of the momentum equation contains two acceleration terms: the Coriolis acceleration --2r V ρω⨯ and the centripetal acceleration--()r ρωω⨯⨯. Where r , r V , and ωare the location vector, the relative frame velocity (that is, therotating frame velocity for a rotating frame of reference), and the angular velocity, respectively.3.2 Turbulence Modeling. One of the most prominent turbulence models, the k ε-model, has been implemented in most general purpose CFD codes and isconsidered as a standard model in many flow simulation cases because of its stability, numerical robustness, and its well established regime of predictive capability.Previous investigations have shown that this model with all its capabilities may not be suitable for applications such as rotating fluid flow in a turbine where a sudden change in strain may occur [16,17]. For this reason, the RNG k ε- modelrecommended by some researchers [4,7,18] has been used.3.3 Grid Generation. In the proposed simulation, the use of an unstructuredtetrahedral grid has been decided on due to its greater adaptation to the geometry. In near-wall regions, boundary layer effects give rise to velocity gradients, which have the greatest normal to the mesh face. Computationally efficient meshes in these regions require that the elements have high aspect ratios. If tetrahedral meshes are used, then a prohibitively fine surface mesh may be required to avoid generating()()__M U U U p S T ρρτ∂+∇⋅⊗=-∇+∇⋅+∂()()()_00h p Uh T U t t ρρλτ-⎛⎫∂∂ ⎪-+∇⋅=-∇⋅∇+∇⋅⋅ ⎪∂∂⎝⎭_τ-()_23r T U U U τμδ-⎛⎫=∇+∇-∇⋅ ⎪⎝⎭()2M r S V r ρωρωω=-⨯-⨯⨯highly distorted tetrahedral elements at the mesh face. So, six inflation layers near the walls are defined. Figure 2 shows the unstructured tetrahedral meshes on the turbine casing and the turbine blades.3.4 Boundary Conditions. Unfortunately, the test cell cannot measure the unsteady mass flow rate and the stagnation temperature, so 1D flow simulation is done using the GT-Suite V6.0 commercial software from Gamma-Technologies to preparethe boundary conditions for 3D flow simulations.Figure 3shows the schematic diagram for a 1D simulation of the combined engine and turbocharger. It is possible to extract both the instantaneous and the time average of boundary conditions at inlet and outlet of the turbine.In the case of steady 3D flow, simulation of the turbine, a mean value of mass flow, and a mean value of stagnation temperature are used as the inlet boundary conditions. Besides, the mean value of static pressure is used as an outlet boundary condition.In the case of 3D unsteady flow simulations, instantaneous mass flow and stagnation temperature boundary conditions are used at the inlet. Also, an instantaneous static pressure boundary condition is used as the outlet condition.For the turbine wheel, adiabatic wall condition is applied.3.5 Rotating Wheel Modeling. Two different ways for rotating wheel modeling are considered, the multiple reference frames and the sliding mesh technique. The MRF technique uses a coordinate system that rotates with the turbine wheel, and N-S equations are modified to take into account the Coriolis and centrifugal forces. This is done by adding the appropriate source term in the momentum equation. The SM technique, in which one part of the mesh is moving or rotating relative to the stationary part, sets the cell size in both the sliding region and the time step. Information between the two parts is exchanged through mass conserving interpolation. At the sliding interface, the connectivity for cells on either side of the interface changes at each time step. The time step must be small enough to ensure that cells on both sides of the sliding interface do not pass each other completely during one time step [19].3.6 Solution Strategy. The governing equations are solved by the finite volume method (FVM) using the commercial software ANSYS CFX V12.0. Thepressure-velocity coupling is based on the SIMPLE algorithm [16,19]. Moreover, the coupled solver is used to solve the equations as a single system. This approach uses a fully implicit discrete modeling of the equationsat any given time step. To reduce the numerical errors, the highresolution discretization scheme is used. This scheme uses the second order backward Euler scheme whenever possible and reverts to the first order backward Euler scheme when required to maintain a bounded solution. In flow regions with low variable gradients, the blend factor is taken close to 1 in order to maintainaccuracy. In areas where the gradients change sharply, the blend factor is taken close to 0 to prevent overshoot and undershoot and keep robustness. The time step is selected equal to 1/ωturbo, where ωturbo is the angular velocity of a turbocharger turbine. In this way, for unsteady flow, when the turbocharger turbine speed is varied between 46,000 rpm to 165,000 rpm corresponding to the engine speed 998 rpm to 5000 rpm, the time step is estimated between 2.0E-4 and 5.7E-5 s. For steady state conditions, the time step behaves like an “acceleration parameter” to guide the approximate solutions in a physically based manner. Numerical calculations are regarded as sufficiently convergence if the RMS values become smaller than1.0E10-4. The number of iterations is changed until the necessary convergence is achieved.Due to the vast memory resources required and also to increase the speed of processing, a Quad cores CPU-3 GHz with 8 MB RAM is used in the local parallel processing setup, and a Dual cores CPU-4 GHz with 8 MB RAM is added in the distributed parallel processing.4 Experimental SetupThe tests are performed on a 1.7 liter in-line four cylinder turbocharged SI engine and various performance parameters are measured at several different engine speeds. The main geometrical and operational specifications of the engine are summarized in Table 2.Figure 4shows the schematic diagram of the test cell configuration. A PC is used for both engine control and measurement. The measurement system takes both analog and digital input. Analog input is measured using either a fast system for crank angle resolved data or a slower time averaged system. Pressure transducers are used tomeasure the relative (gauge) and absolute pressures of the exhaust gases.The transducers are piezoresistive elements, capable of measuring pressures in the range of 0–6 bars. Temperatures are measured by thermocouples type k, in the range of 200–1300 _C. The turbocharger speed is measured by a speed sensor thatworks on the basis of eddy current measurement technique in the range of 0-400,000 rpm. The test bench is shown in Fig. 5.中文翻译对涡轮增压器涡轮机性能参数在入口脉动流下的调查对 1.7升发动机的少叶片涡轮增压器的涡轮机的三维定常和非定常可压缩流动（脉动）进行数值模拟，并利用涡轮增压发动机测试单元对其结果进行实验验证。

西安科技大学高新学院本科毕业设计本科毕业设计（（论文论文））外文翻译译文外文翻译译文学生姓名学生姓名学生姓名 : 熊 静 院院 （系）: 建筑与土木工程 专业班级专业班级专业班级 : 工程管理0703 指导教师指导教师指导教师 : 胥卫平 完成日期完成日期完成日期 : 2010年10月10日求要 求1、外文翻译是毕业设计（论文）的主要内容之一，必须学生独立完成。

2、外文翻译译文内容应与学生的专业或毕业设计（论文）内容相关，不得少于15000印刷符号。

3.外文翻译译文用A4纸打印。

文章标题用3号宋体，章节标题用4号宋体，正文用小4号宋体，20磅行距；页边距上、下、左、右均为2.5cm，左侧装订，装订线0.5cm。

按中文翻译在上，外文原文在下的顺序装订。

4、年月日等的填写，用阿拉伯数字书写，要符合《关于出版物上数字用法的试行规定》，如“2005年2月26日”。

5、所有签名必须手写，不得打印。

房 地 产 市 场 的 泡 沫 理查德赫林 苏珊沃特泽尔/ Lurie房地产中心工作文件＃402理查德赫林沃顿商学院宾夕法尼亚大学宾夕法尼亚州费城，19104 herring@苏珊沃特沃顿商学院宾夕法尼亚大学宾夕法尼亚州费城，19104wachter@ 2002年3月2002年4月22-24日，在芝加哥编写了与世界银行，芝加哥联邦储备银行集团的会议“资产价格泡沫：货币的含义，法规，政策和国际政策。

/newsletter/bubbles.pdf房地产市场的泡沫理查德赫林、苏珊沃特简介房地产泡沫可能会出现没有银行危机。

和银行业危机可能没有出现房地产泡沫。

但是，这两种现象都在显着的相关实例数据。

实体经济的后果，对银行的依赖作用在该国的金融体系。

在美国，银行只持有约22％的总资产，大多数借款人可以找到替代品的银行贷款和一般的影响经济活动水平相对轻微。

但是，在一些国家，银行扮演更主导作用，如美国的大萧条之前，大（其中银行持有65％的总资产），或现今日（其中79％的资产银行持有的总数），或新兴 市场（如银行往往持有超过80％的资产总额），为的后果实体经济可以更加严峻。

外文资料及译文原文：Television Video SignalsAlthough over 50 years old , the standard television signal is still one of the most common way to transmit an image. Figure 8.3 shows how the television signal appears on an oscilloscope. This is called composite video, meaning that there are vertical and horizontal synchronization (sync) pulses mixed with the actual picture information.These pulses are used in the television receiver to synchronize the vertical and horizontal deflection circuits to match the video being displayed. Each second of standard video contains 30 complete images, commonly called frames , A video engineer would say that each frame contains 525 lines, the television jargon for what programmers call rows. This number is a little deceptive because only 480 to 486 of these lines contain video information; the remaining 39to 45 lines are reserved for sync pulses to keep the television’s circuits synchronized with the video signal.Standard television uses an interlaced format to reduce flicker in the displayed image. This means that all the odd lines of each frame are transmitted first, followed by the even lines. The group of odd lines is called the odd field, and the group of even lines is called the even field. Since each frame consists of two fields, the video signal transmits 60 fields per second. Each field starts with a complex series of vertical sync pulses lasting 1.3 milliseconds. This is followed by either the even or odd lines of video. Each line lasts for 63.5 microseconds, including a 10.2 microsecond horizontal sync pulse, separating one line from the next. Within each line, the analog voltage corresponds to the gray scale of the image, with brighter values being in the direction away from the sync pulses. This place the sync beyond the black range. In video jargon, the sync pulses are said to be blacker than black..The hardware used for analog-to-digital conversion of video signals is called a frame grabber. This is usually in the form of an electronics card that plugs into a computer, and connects to a camera through a coaxial cable. Upon command from software, the frame grabber waits for the beginning of the next frame, as indicated by the vertical sync pulses. During the following two fields, each line of video is sampled many times, typically 512,640 or 720 samples per line, at 8bits per sample. These samples are stored in memory as one row of the digital image.This way of acquiring a digital image results in an important difference between the vertical and horizontal directions. Each row in the digital image corresponds to one line in the video signal, and therefore to one row of wells in the CCD. Unfortunately,the columns are not so straightforward. In the CCD, each row contains between about 400 and 800 wells (columns), depending on the particular device used. When a row of wells is read from the CCD, the resulting line of video is filtered into a smooth analog signal, such as in Figure 8.3. In other words, the video signal does not depend on how many columns are present in the CCD. The resolution in the horizontal direction is limited by how rapidly the analog signal is allowed to change. This is usually set at 3.2 MHz for color television, resulting in a rise time of about 100 nanoseconds, i.e, about1/500th of the 53.2 microsecond video line.When the video signal is digitized in the frame grabber, it is converted back into conclusions. However, these columns in the digitized image have no relation to the columns in the CCD. The number of columns in the digital image depends solely on how many times the frame grabber samples each line of video. For example, a CCD might have 800 wells per row, while the digitized image might only have 512 pixels (i.e columns) perrow.The number of columns in the digitized image is also important for another reason. The standard television image has an aspect ratio of 4 to 3, i.e. it is slightly wider than it is high. Motion pictures have the wider aspect ratio of 25 to 9. CCDs used for scientific applications often have an aspect ratio of 1 to 1, i.e , a perfect square. In any event, the aspect ratio of a CCD is fixed by the placement of the electrodes, and cannot be altered. However, the aspect ratio of the digitized image depends on the number of samples per line. This becomes a problem when the image is displayed, either on a video monitor or in a hardcopy. If the aspect ratio isn’t properly reproduced, the image looks squashed horizontally or vertically.The 525 line video signal described here is called NTSC (National Television Systems Committee), a standard defined way back in 1954. This is the system used in the United States and Japan. In Europe there are two similar standards called PAL (Phase Alternation by Line) and SECAM (Sequential Chrominance and Memory). The basic concepts are the same, just the numbers are different. Both PAL and SECAM operate with 25 interlaced frames per second, with 625 lines per frame. Just as with NTSC, some of these lines occur during the vertical sync, resulting in about 576 lines that carry picture information. Other more subtle differences relate to how color and sound are added to the signal.The most straightforward way of transmitting color television would be to have three separate analog signals, one for each of the three colors the human eye can detect: red, green and blue. Unfortunately, the historical development of television did not allow such a simple scheme. The color television signal was developed to allow existing blackand white television sets to remain in use without modification. This was done by retaining the same signal for brightness information , but adding a separate signal for color information. In video jargon, the brightness is called the luminance signal, while the color is the chrominance signal. The chrominance signal is contained on a 3.58 MHz carrier wave added to the black and white video signal. Sound is added in this same way, on a 4.5 MHz carrier wave. The television receiver separates these three signals, processes them individually, and recombines them in the final diplay.译文：关键词：核心，合成信号，电压耦合电视信号尽管已经拥有50年的历史了,电视信号依然是常用的传递信息的途径之一。

中英互译函数中英互译函数是一种可以将中文翻译为英文或将英文翻译为中文的函数。

在日常生活和工作中，我们经常会遇到需要进行中英互译的情况，比如阅读外文文献、翻译文件、查找英文资料等。

使用中英互译函数可以方便快捷地完成这些任务。

中英互译函数的实现依赖于各种翻译工具和技术，如谷歌翻译、百度翻译、有道翻译等。

这些翻译工具利用了机器翻译和自然语言处理等技术，能够将输入的中文或英文文本转换为相应的英文或中文文本。

在编程中，我们可以使用各种编程语言实现中英互译函数。

比如，在Python中可以使用第三方库如py-translate、googletrans等来实现中英互译功能。

这些库提供了简单易用的API，可以将中文文本翻译为英文或将英文文本翻译为中文。

下面是一个使用Python编写的中英互译函数的示例：```pythonimport googletransdef translate(text, src_lang, dest_lang):translator = googletrans.Translator()result = translator.translate(text, src=src_lang,dest=dest_lang)return result.text# 将中文文本翻译为英文chinese_text = "中英互译函数是一种可以将中文翻译为英文或将英文翻译为中文的函数。

"english_text = translate(chinese_text, 'zh-CN', 'en')print(english_text)# 将英文文本翻译为中文english_text = "The Chinese-English translation function is a function that can translate Chinese into English or translate English into Chinese."chinese_text = translate(english_text, 'en', 'zh-CN')print(chinese_text)```上述示例中，我们使用了Google翻译API来实现中英互译功能。