附件1：外文资料翻译译文
组合优化和绿色物流
摘要：本文的目的是介绍绿色物流领域及描述通过组合优化制定中出现的一些问题。本文重点介绍了逆向物流、废物管理和物流配送车辆调度等问题。
关键字: 绿色物流、逆向物流、组合优化、废物管理、危险物品
1 引言
绿色物流主要关注的是可持续的生产方式和货物的销售，重点考虑到环境和社会的因素。因此，绿色物流的目标并不只是关注物流政策的执行对经济的影响，还关注对社会具有的更加广泛的影响，如对环境污染的影响。绿色物流活动包括测量不同分销策略对环境的影响，减少物流活动中的能源使用量，减少废物，管理和处理物流对环境的影响。近年来关于人们在地球的活动和物流实践对环境造成的影响越来越受到关注。很多组织和企业开始测量他们碳的排放量，以便可以监视他们的活动对环境的影响。政府现正考虑减少排放和其它环保措施。因此不管是公司还是政府对绿色物流越来越感兴趣。传统物流模式的生产和分配都集中在约束业务成本，将其降至最低。但是考虑到更加长远的目标和与绿色物流有关的问题，就必须有新的工作方法和模式，其中也包含了一些有趣的，最新应用的研究模型。阐述这一领域内所有的研究模型将需要很长篇幅的文章，所以本文的重点是集中于一些在绿色物流的应用中出项的新的或者是修订的组合优化模型。对于这些组合优化的工作，希望对于那些组合优化的新模型将带来有趣的新挑战，同时该工作也可能对环境带来重大影响。这份文件的原始版本可以在史宾斯和列更斯（2007年)找到。它讨论了不同领域的有关绿色物流的议程。第二部分阐述了对逆向物流的担忧以及考虑到产品的整个生命周期和对各种可能性的模型的回收利用。第三部分是废物管理，包括了危险废物运输的模型、滚装滚卸容器和家居废物收集。第四部分涉及车辆路径模型和绿色物流目标相关的问题。第五部分为最后的结论。
2 逆向物流
在文献中可以找到各种逆向物流的定义。例如，弗莱希曼等人（1997年）称逆向物流是”涵盖了在物流活动中从使用的产品”，用户不再需要的产品及在市场
中再利用产品的过程。道拉图沙斯（2000年)逆向物流解释为”制造商有系统地从消费者手中回收以前所提供的产品或部件来再循环、再制造或处置的一个进程”。后来，欧洲工作小组在逆向物流的研究中，列维朗，德克尔等人 (2004年）给出这一定义：在规划的过程中，实施和控制原材料的落后流动，在制品库存中，包装和成品从制造，分销到使用，恢复或适当处置的过程。在他们的书中，罗杰斯和连布克 (1999年）简要地考虑逆向物流与绿色物流的区别。逆向物流应该从消费者手中获得一些商品或产品回到商品流供应链的早期阶段从而减少了废物，这肯定意味着逆向物流应列入绿色物流。例如，德布里托和范德兰（2003年）说必须估计产品返回检查库存管理问题。但是会有的只涉及向前流动的其它类型那么就不可以被称为逆向物流，但如果它们包括环境方面的考虑，也将被列入绿色物流货物的物流活动。例如，蒙德沙因和席勒库特（1997年) 通过描述混合的整数线性规划模型来确定在智利铜工业的最优投资策略。通过在生产过程中排放的空气污染来控制模型的一个关键部分。欧洲共同体内部立法高度重视产品的循环再造，而且，在某些情况下，已确立了制造商在产品使用结束后的相关责任。例如，废电子和电气设备(WEEE) 指令。这种立法是建立逆向物流业务的重要性的一种驱动。大多数的欧洲公司会越来越多的考虑将逆向物流活动纳入他们的业务操作之中。
2.1 区位模型在逆向物流中的应用
对于一般设施选址的理论研究已有很多。然而，我们发现在文献中关于逆向物流（RL）这一主题的论文却相对较少。库勒德库（1998）提出RL网络设计模型。他设计了一个为多产品和多级的情况下的模型。在必要时该模型允许添加附有相应的费用函数的新设施。他建议将网络图的设计与交通图一同作为他的模型输入的依据。巴罗斯等人（1998）考虑在荷兰（回收建筑废料的子产品）砂的回收问题。他们提出了两个级别的砂的选址模型问题，并考虑采用启发式过程对其进行优化。弗莱希曼等人（2000年）审查了九个发表的关于产品在不同行业的回收物流网络设计的案例研究，确定了一些产品回收网络的一般性特点，并与传统的物流结构进行比较。他们产品分类回收网络在三个子地区：可重复使用的项目网络，再制造网络，和回收网络。
其他处理这个主题的相关引用（例如，克里克1998；萨尔基斯2001；弗莱施曼2001）。在这个领域中大多数模型的开发都类似于传统的选址问题，在特定位置
的分配模型中（可以看到克朗和夫里延斯1995；安蒙斯等1999；斯彭勒等1997；马林和贝利格林 1998；贾亚拉曼等1999；克里克等1999， 2001；弗莱施曼等2000）。在大多数模型、运输和加工成本已最小化，而环境设计网络的成本经常被忽略。2.2 动态批量问题
关于它的动态形式有很多种，其中最简单的是，从设施方面考虑，在有限的资源条件下，仓库或者零售商，面临着单个项目的动态需求。（见瓦格纳，于1958
年圣灵降临节）。该项目的设施场所是根据供应机构的订单来决定的。比如说，这是一个有无限量产品的制造商或供应商。该模型假设成本是按照一个固定顺序（所设置的）来支出的，采购成本为一个单位的线性支出，在单位时间内，库存都是具有线性持有成本的。考虑到时间的价值以及成本参数，问题在于在每个阶段的什么时候以及怎样订购设施才能使得在满足生产需要的同时使得成本最小化。
动态调整很多问题得到了很好的研究，因为它是第一个推出了超过四十年前的方法。精确解技术，称为基于动态规划的瓦格纳瓦锡算法，是众所周知的生产规划与库存控制。有关此模型的详细信息，请参阅由布拉默尔和辛智列维书（1997年），约翰逊和蒙哥马利（1974年)和银等(1996年)。各种启发式方法还提议，例如银粉银和餐中所述的启发式算法（1973)托特等人（2006年）认为很多规模模型是一种维修库存也可以是在制造的操作，利用回收和生产维修库存与新制造的库存并无区别。再制造的例子包括一次性使用的相机和复印机。可谓是再制造库存系统图。
1.研究的模型进行了以下假设：
——没有回报的处理方案；
——持有成本为服务成本大于持有成本的回报率；
——变制造与再制造费用不包括在内。
我们的目标是再次尽量减少设置成本和持有成本的总和。这被认为是两种变体。第一个变量是假定建立两个程度相当的联合生产线，这将花费适当地费油。第二个变量是假定制造与再制造费用单独设置。
3 废物管理
由于固定废物生产被广泛认为有所增加再加上环境问题被日益关注，所以近年来，各国政府废物管理政策集中在避免产生废物、再利用和回收利用。因此在这些
管理领域，特别是对于较发达的国家方面取得了重大进展。在环境方面废物管理指有关废物材料的运输活动，显然这是绿色物流议程的一部分。
4 车辆路径与调度
车辆路径与调度问题(VRSP)涉及到确定路线和车队的时间表以满足客户的需求。可以按以下方式描述制约车辆路径基本能力的问题(CVRP)。我们在已知位置和要求的中央仓库设置车辆流量Q，以满足从中央仓库交货的要求。车辆的每个路径必须满足每个交付客户的需求，且不能超过车辆的能力。其目的是确定车辆，确定总成本最低的路线。如果车辆的数量是固定的，可能还包括一个额外的任期，如果路线的数量不同，那么与车辆数目成正比。
CVRP 和及其各种形式也曾泽范和拉姆泽 (1959年)中推出了文学研究。其确切的解决方案是很难确定大规模的问题，这是一个很难解决的问题。专门的算法能够始终如一的为高达50家客户找到最优的解决方案；虽然更大的问题已经解决，但是在某些情况下，往往最优性的代价就是花费相当长的时间。在实践中，其他的变化和附加约束，通常必须考虑到使车辆路径以及其最优性。有许多的解决方案过程基于启发式算法，旨在提供良好可行的解决方案，在可接受的计算时间内，但不保证最优性。
有几本书和调查文章来汇总不同的方法，并且在文章中有所引用（例如，黄金与阿萨德 1988年；托特和维 2001年)，这些在杂志撰写的文章中被大量引用。同时有很多关于CVRP的研究工作。对于此问题已定制的确切的几种方法（如拉波特和诺贝特； 1987年阿格沃尔等1989 年；里斯加德2004 年；深泽等l2006 年）。有人建议用近似方法和启发式技术来解决复杂的问题和算出合理的时间（请参见
戈德诺等.2002 年；拉波特和塞姆特 2002年；科尔多和拉波特 2004年；科尔多等2005 年）。大多数的这些做法基于本地搜索技术。
大多数论文认为车厂和客户之间行驶费用和时间是已知的，固定的。他们一般就是用表或者图形或者网络计算最小路径。然而在实践中，时间和最短路径可能有所不同，尤其是通过一天的时间。
5 结论
本白皮书描述了绿色物流所涉领域，并描述了一些新的问题出现时，所考虑的并不仅仅是经济，而是更加涉及到环境和社会因素。有许多不同类型的模型在处理
绿色物流问题中，扮演了关键角色，但在本文中，我们都集中在描述用组合优化模型解决及设计方案。据预计由于环境因素承担的重要性日益增加，组合优化模型和技术将面临更多的挑战。在英国，绿色物流模式有许多对不同方面有研究的联合会和在绿色物流项目的网站上可以找到详细信息。绿色物流项目包括涵盖的这项讨论了逆向物流和物流配送车辆调度，绿色物流议程上的政策的影响等有关主题的几个模块。
附件2：外文原文（复印件）
Combinatorial optimization and Green Logistics Abstract The purpose of this paper is to introduce the area of Green Logistics and to describe some of the problems that arise in this subject which can be formulated as combinatorial optimization problems. The paper particularly considers the topics of reverse logistics, waste management and vehicle routing and scheduling.
Keywords Green Logistics、Reverse logistics 、Combinatorial optimization 、Waste management 、Hazardous materials
1 Introduction
Green Logistics is concerned with producing and distributing goods in a sustainable way,taking account of environmental and social factors. Thus the objectives are not only concerned with the economic impact of logistics policies on the organization carrying them out,but also with the wider effects on society, such as the effects of pollution on the environment. Green Logistics activities include measuring the environmental impact of different distribution strategies, reducing the energy usage in logistics activities, reducing waste and managing its treatment. In recent years there has been increasing concern about the environmental effects on the planet of human activity and current logistic practices may not be sustainable in the long term.Many organizations and businesses are starting to measure their carbon footprints so that the environmental impact of their activities can be monitored. Governments are considering targets for reduced emissions and other environmental measures.There is therefore increasing interest in Green Logistics from companies and governments.Traditional logistics models for production and distribution have concentrated on minimizing costs subject to operational constraints. But consideration of the wider objectives and issues connected with Green Logistics leads to new methods of working and new models,some of which pose interesting new applications for operational research models of various types. A survey of all operational research models in this area would require a very long article and so the focus of this
paper is to concentrate on some of the new or revised combinatorial optimization models that arise in Green Logistics applications. For those working in combinatorial optimization it is hoped that these new models will pose interesting new challenges that may have significant effects on the environment when the results are applied.The original version of this paper can be found in Sbihi and Eglese (2007). It discusses different areas that relate to the Green Logistics agenda. Section 2 concerns Reverse Logistics models that take account of the full life-cycle of a product and the possibilities of various forms
of recycling. Section 3 covers Waste Management that includes models for the transportation of hazardous waste, roll-on roll-off containers and the collection of household waste. Section 4 deals with Vehicle Routing models and issues relating to Green Logistics objectives. Section 5 contains the final conclusions.
2 Reverse Logistics
There are various definitions of Reverse Logistics to be found in the literature. For example,Fleischmann et al. (1997) say that reverse logistics is “a process which encompasses the logistics activities all the way from used products no longer required by the user to products again usable in a market”. Dowlatshahi (2000) explains Reverse Logistics as “a process in which a manufacturer systematically accepts previously shipped products or parts from the point for consumption for possible recycling, remanufacturing or disposal”. Later, the European Working Group on Reverse Logistics, REVLOG, Dekker et al. (2004), give this definition: “The process of planning, implementing and controlling backward flows of raw materials, in process inventory, packaging and finished goods, from a manufacturing, distribution or use point, to a point of recovery or point of proper disposal”.In their book, Rogers and Tibben-Lembke (1999) briefly consider the differences between Reverse Logistics and Green Logistics. In Reverse Logistics there should be some flow of products or goods back from the consumer to an earlier stage of the supply chain.The reduction of waste that this implies certainly means that Reverse Logistics should be included within Green Logistics. For example, De Brito and Van Der Laan (2003) examine inventory management issues when product returns must be estimated. However there will be other models of logistics
activities involving only forward flows of goods that could not be described as reverse logistics, but if they include environmental considerations, will also be included within Green Logistics. For example,Mondschein and Schilkrut (1997) describe a mixed integer linear programming model to determine the optimal investment policies for the copper industry in Chile. A key part of the model was to control air pollution through emissions in the production process. Legislation within the European Community gives high importance to recycled products and, in some cases, it has established the responsibility for the end of life products to the manufacturers. For example, the Waste Electronic and Electrical Equipment (WEEE) Directive (2002/96/EC)1 deals with this. Such legislation is one of the drivers in establishing the importance of reverse logistics operations. Most European companies will increasingly have to think about incorporating Reverse Logistics activities in their business operations.
2.1 Location models used in Reverse Logistics
There is a huge amount of research in facility location theory in general. However, in the literature we found relatively few papers on this topic applicable to Reverse Logistics (RL). Krikke (1998) proposes some models for RL network design. He designs a model for a multi-product and multi-echelon situation. The model allows new facilities to be added with the corresponding cost functions when necessary. He proposes the design of a network graph and a transportation graph as basic inputs for his model. Barros et al. (1998) consider the problem of the recycling of sand (asubproduct of recycling construction waste) in the Netherlands. They propose a two-level location model for the sand problem and consider its optimization using heuristic procedures. Fleischmann et al. (2000) reviewed nine published case studies on logistics network design for product recovery in different industries, and identified some general characteristics of product recovery networks, comparing them with traditional logistics structures. They classified the product recovery networks in three sub-areas: re-usable item networks, remanufacturing networks, and recycling networks.
Other references deal with this topic (e.g., Krikke 1998; Sarkis 2001; Fleischmann 2001). Most of the models developed in this field are similar to the traditional location problems,in particular location-allocation models (see Kroon and Vrijens 1995; Ammons
et al. 1999;Spengler et al. 1997; Marìn and Pelegrìn 1998; Jayaraman et al. 1999; Krikke et al. 1999,2001; Fleischmann et al. 2000). In most of the models, transportation and processing costs were minimized while the environmental costs associated with the designed network were often neglected.
2.2 Dynamic lot-sizing problem
The dynamic lot sizing problem in its simplest form considers a facility, possibly a warehouse or a retailer, which faces dynamic demand for a single item over a finite horizon (see Wagner and Whitin 1958). The facility places orders for the item from a supply agency, e.g.,a manufacturer or a supplier, which is assumed to have an unlimited quantity of the product.The model assumes a fixed ordering (setup) cost, a linear procurement cost for each unit purchased, and a linear holding cost for each unit held in inventory per unit time. Given the time varying demand and cost parameters, the problem is to decide when and how much to order at the facility in each period so that all demand is satisfied at minimum cost.
The dynamic lot-sizing problem has been well studied in the past since it was first introduced more than four decades ago. The exact solution technique, known as the Wagner- Whitin algorithm, based on Dynamic Programming is well known in production planning and inventory control. For more information about this model, see the books by Bramel and Simchi-Levi (1997), Johnson and Montgomery (1974) and Silver et al. (1996). A variety of heuristic methods have also been proposed, for example the
Silver-Meal heuristic described in Silver and Meal (1973).
In Teunter et al. (2006) a variant of the basic lot sizing model is considered where the serviceable stock may also be made using a remanufacturing operation that utilizes returns and produces serviceable stock that is indistinguishable from the newly manufactured stock. Examples of remanufacturing include single-use cameras and copiers. An inventory system with remanufacturing can be described in Fig . 1. The model studied makes the following assumptions:
– no disposal option for returns;
– holding cost for serviceables is greater than holding cost for returns;
– variable manufacturing and remanufacturing costs are not included.
The objective is again to minimize the sum of the set-up costs and holding costs. Two variants are considered. In the first it is assumed that there is a joint set-up cost for manufacturing and remanufacturing which is appropriate when the same production line is used for both processes. The second variant assumes separate set-up costs for manufacturing and remanufacturing. We review these models in the next two sections.
3 Waste management
The widely acknowledged increase in solid waste production, together with the increased concern about environmental issues, have led local governments and agencies to devote resources to solid waste collection policy planning. Waste management is a key process to protect the environment and conserve resources. In recent years, policies of governments towards waste management have focused on waste avoidance, reuse and recycling. As a result there has been significant progress in these management areas, particularly for the more developed nations. The environmental aspects of waste management means that activities concerning the transport of waste materials are clearly part of the Green Logistics agenda.
4 Vehicle routing and scheduling
The Vehicle Routing and Scheduling Problem (VRSP) concerns the determination
of routes and schedules for a fleet of vehicles to satisfy the demands of a set of customers. The basic Capacitated Vehicle Routing Problem (CVRP) can be described in the following way.We are given a set of homogeneous vehicles each of capacity Q, located
at a central depot and a set of customers with known locations and demands to be satisfied by deliveries from the central depot. Each vehicle route must start and end at the central depot and the total customer demand satisfied by deliveries on each route must not exceed the vehicle capacity, Q. The objective is to determine a set of routes for the vehicles that will minimize the total cost. The total cost is usually proportional to the total distance traveled if the number of vehicles is fixed and may also include an additional term proportional to the number of vehicles used if the number of routes may vary.
The CVRP and many of its variants have been well studied in the literature since its
introduction by Dantzig and Ramser (1959). Its exact solution is difficult to determine for large-scale problems as it is a member of the class of NP-hard problems. Specialised algorithms are able to consistently find optimal solutions for cases with up to about 50 customers; larger problems have been solved to optimality in some cases, but often at the expense of considerable computing time.In practice, other variations and additional constraints that must be taken into consideration usually make the vehicle routing problem even more difficult to solve to optimality.So many solution procedures are based on heuristic algorithms that are designed to provide good feasible solutions within an acceptable computing time, but without a guarantee of optimality.
There are several books and survey articles that summarize different approaches and provide references to the large number of journal articles that have been written on this topic (e.g., Golden and Assad 1988; Toth and Vigo 2001). There are many other research works about the classical CVRP. Some exact methods have been tailored for this problem (e.g., Laporte and Nobert 1987; Agarwal et al. 1989; Lysgaard et al. 2004; Fukasawa et al.2006). Others have proposed approximate methods and heuristics due to the complexity of the problem and the need to solve it in a reasonable computing time (see Gendreau et al.2002; Laporte and Semet 2002; Cordeau and Laporte 2004; Cordeau et al. 2005). Most of these approaches are based on local search techniques.
Most papers assume that the costs and times of traveling between the depot and the customers and between customers are known and fixed. They are either given or calculated using a shortest path algorithm on the graph or network representing the locations. In practice,the times and shortest paths may vary, particularly by time of day.
5 Conclusions
This paper has described the field covered by Green Logistics and described some of the new problems that arise when the objectives considered are not simply economic, but involve wider environmental and social considerations too. There are many different types of operational research models that have key roles to play in dealing with Green Logistics issues, but in this paper we have concentrated on describing areas where combinatorial optimization is central to the design of acceptable solutions. It is expected
that as environmental factors assume increasing importance, the effective use of combinatorial optimization theories and techniques will be needed to meet the challenges of new problems.There is a research consortium in the UK working on many different aspects of Green Logistics models and more information can be found on the website of the Green Logistics project. The Green Logistics project includes several work modules that relate to topics covered in this review such as reverse logistics and the effect of vehicle routing and scheduling policies on the Green Logistics agenda.
我国第三方物流中存在的问题、原因及战略选择 熊卫 【摘要】我国物流业发展刚刚起步，第三方物流的理论和实践等方面都比较薄弱。本文指出我国第三方物流存在的问题在于国内外第三方物流企业差距、物流效率不高、缺乏系统性管理、物流平台构筑滞后、物流管理观念落后等。分析了产生上述问题的原因，并提出了精益物流、中小型第三方物流企业价值链联盟、大型第三方物流企业虚拟化战略等三种可供选择的第三方物流企业发展战略。 【关键词】第三方物流；精益物流战略；价值链联盟；虚拟化战略 1引言 长期以来，我国国内企业对采购、运输、仓储、代理、包装、加工、配送等环节控制能力不强，在“采购黑洞”、“物流陷井”中造成的损失浪费难以计算。因此，对第三方物流的研究，对于促进我国经济整体效益的提高有着非常重要的理论和实践意义。本文试图对我国策三方物流存在的问题及原因进行分析探讨，并提出第三方物流几种可行的战略选择。 2我国第三方物流业存在的主要问题 (一)我国策三方物流企业与国外第三方物流企业的差距较大，具体表现在以下几个方面： 1、规模经济及资本差距明显。由于国外的大型第三方物流企业从全球经营的战略出发，其规模和资本优势是毫无疑问的，尤其初创时期的我国策三方物流业，本身的规模就很小，国外巨头雄厚的资本令国内企业相形见绌。 2、我国策三方物流业企业提供的物流服务水准及质量控制远不如国外同行。当国内一些企业还在把物流理解成“卡车加仓库“的时候，国外的物流企业早已完成了一系列标准化的改造。同时，国外的物流组织能力非常强大，例如德国一家第三方物流公司，公司各方面的物流专家遍布欧洲各地。如果有客户的货物需要经达不同的国家，那么欧洲各地的这些专家就在网上设计出一个最佳的物流解决方案。这种提供解决方案的能力就是这第三方物流公司的核心能力，而不像国内公司号称拥有多少条船，多少辆车。 3、我国加入WTO后物流产业的门槛降低。在物流服务业方面：我国承诺所有的服务行业，在经过合理过渡期后，取消大部分外国股权限制，不限制外国服务供应商进入
外文文献原稿和译文 原稿 Logistics from the English word "logistics", the original intent of the military logistics support, in the second side after World War II has been widely used in the economic field. Logistics Management Association of the United States is defined as the logistics, "Logistics is to meet the needs of consumers of raw materials, intermediate products, final products and related information to the consumer from the beginning to the effective flow and storage, implementation and control of the process of . " Logistics consists of four key components: the real flow, real storage, and management to coordinate the flow of information. The primary function of logistics is to create time and space effectiveness of the effectiveness of the main ways to overcome the space through the storage distance. Third-party logistics in the logistics channel services provided by brokers, middlemen in the form of the contract within a certain period of time required to provide logistics services in whole or in part. Is a third-party logistics companies for the external customer management, control and operation of the provision of logistics services company. According to statistics, currently used in Europe the proportion of third-party logistics services for 76 percent, the United States is about 58%, and the demand is still growing; 24 percent in Europe and the United States 33% of non-third-party logistics service users are actively considering the use of third-party logistics services. As a third-party logistics to improve the speed of material flow, warehousing costs and financial savings in the cost effective means of passers-by, has become increasingly attracted great attention.
旅游服务贸易外文翻译文献(文档含英文原文和中文翻译)
旅游服务贸易的国际竞争力：罗马尼亚的案例 引言 旅游业是唯一的可以为任何发展水平的国家提供贸易机会的服务活动。然而，它也是一个很大程度因为国家的能力和在全球经济中的表现而又有明确的利益分配不均行业，而这又需要提高自己的竞争力。 自20世纪90年代初，罗马尼亚旅游业经历了出口量，生长速率和结构的重大变化。这些不同的波动都影响了罗马尼亚在国际旅游市场上相对的竞争地位并引起了其旅游贸易平衡的变化。同时，新的和更多的错杂的欧式建筑，引起了罗马尼亚的区域旅游竞争力的显著变化。 在此背景下，本文试图提出一个框架，以竞争力和旅游贸易表现之间的关系为重点，来评估罗马尼亚的旅游服务贸易的国际竞争力。 一、国际竞争力视角：国际竞争力之与国际旅游业的相关性 国际竞争力的概念，尽管有争议，难以捉摸，但现在已经得到认可，并继续吸引世界各地的学者和决策者的关注。 到目前为止，为提高国际竞争力已采取措施，都被认为是在经济层面进行的(加瑞利，2003)通常是指一个国家生产的商品和服务，以满足国际市场的考验，并同时保持和增加公民的收入的能力(欧洲委员会，2007)。 由于竞争力最终取决于一国企业在国内和国际的市场成功，所以对竞争力的注意力都集中在企业层面的竞争力上(波特，1990)，对于此的普遍理解是指“……该公司保持，并更好的是，扩大其全球市场份额，增加和扩大利润的能力” (克拉克和盖，1998, 经济合作与发展组织，1993)。 因此，虽然广泛流传但是国际竞争力作为与国家经济和其国际贸易相关
的理论基础已经不太在学术文献进行分析。因此，一个国家国际竞争力的性质，效益和局限性仍然含糊不清(科尔德威尔，2000,克鲁格曼，1994, 1996)。 国际竞争力，是指一个国家在货物和服务贸易方面巩固和保持贸易优势相对于世界其他地区的贸易优势。 每当一个国家的经济福利通过贸易流量的增加，或通过从初始平衡状态的贸易条件的改变而增加，他的国际竞争力都会得到提高(科尔德威尔，2000)。 贸易理论表示，经济福利依赖于一个国家有比较优势的货物和服务的生产。这实际上意味着当生产符合一国的比较优势的情况时国际竞争力能得到保障。如果一国能在国际上表现良好并在出口市场竞争成功，这可能就是他们健全的国际竞争力的标志。 因此，在国际上，竞争力定义为一个经济体能够吸引其出口需求和投资供给需求的能力和在所有社会规范内提升公民生活水平的能力。这反过来又取决于宏观和微观经济政策，影响生产的经济生产率要素和经营成本的法规和制度。 一个可用的文献回顾和实证证据支持国际竞争力可以解释为在一定程度上，一个国家的出口能力这一观点(道乐和沃尔夫，1993, 格博格等. 2004)。还有就是，事实上，是出口表现和国际竞争力之间的循环关系。出口是国际竞争力的第一衡量指标。出口情况的改善会导致了一个国家的竞争力提升。这种效果是一个企业的技能，知识，创新和运用新技术并能够在一个成功的商业方式中利用技术机会等的结果。 另一方面，为了在竞争激烈的全球市场努力成功实现出口，一个国家被迫提高竞争力。更具竞争力的国家，它的经济更强大。因此，它更有能力在全球市场竞争，以吸引具有较高的知识，技能，水平人们去购买新技术等，
基本电路 包括电路模型的元素被称为理想的电路元件。一个理想的电路元件是一个实际的电气元件的数学模型，就像一个电池或一个灯泡。重要的是为理想电路元件在电路模型用来表示实际的电气元件的行为可接受程度的准确性。电路分析，本单位的重点，这些工具，然后应用电路。电路分析基础上的数学方法，是用来预测行为的电路模型和其理想的电路元件。一个所期望的行为之间的比较，从设计规范，和预测的行为，形成电路分析，可能会导致电路模型的改进和理想的电路元件。一旦期望和预测的行为是一致的，可以构建物理原型。 物理原型是一个实际的电气系统，修建从实际电器元件。测量技术是用来确定实际的物理系统，定量的行为。实际的行为相比，从设计规范的行为，从电路分析预测的行为。比较可能会导致在物理样机，电路模型，或两者的改进。最终，这个反复的过程，模型，组件和系统的不断完善，可能会产生较准确地符合设计规范的设计，从而满足需要。 从这样的描述，它是明确的，在设计过程中，电路分析中起着一个非常重要的作用。由于电路分析应用电路模型，执业的工程师尝试使用成熟的电路模型，使设计满足在第一次迭代的设计规范。在这个单元，我们使用20至100年已测试通过机型，你可以认为他们是成熟的。能力模型与实际电力系统理想的电路元件，使电路理论的工程师非常有用的。 说理想电路元件的互连可用于定量预测系统的行为，意味着我们可以用数学方程描述的互连。对于数学方程是有用的，我们必须写他们在衡量的数量方面。在电路的情况下，这些数量是电压和电流。电路分析的研究，包括了解其电压和电流和理解上的电压施加的限制，目前互连的理想元素的每一个理想的电路元件的行为电路分析基础上的电压和电流的变量。电压是每单位电荷，电荷分离所造成的断电和SI单位伏V = DW / DQ。电流是电荷的流动速度和具有的安培SI单位（I= DQ/ DT）。理想的基本电路元件是两个终端组成部分，不能细分，也可以在其终端电压和电流的数学描述。被动签署公约涉及元素，当电流通过元素的参考方向是整个元素的参考电压降的方向端子的电压和电流的表达式使用一个积极的迹象。 功率是单位时间内的能量和平等的端电压和电流的乘积;瓦SI单位。权力的代数符号解释如下： 如果P> 0，电源被传递到电路或电路元件。 如果p<0，权力正在从电路或电路元件中提取。 在这一章中介绍的电路元素是电压源，电流源和电阻器。理想电压源保持一个规定的电压，不论当前的设备。理想电流源保持规定的电流不管了整个设备的电压。电压和电流源是独立的，也就是说，不是任何其他电路的电流或电压的影响;或依赖，就是由一些电路中的电流或电压。一个电阻制约了它的电压和电流成正比彼此。有关的比例常数电压和一个电阻值称为其电阻和欧姆测量。 欧姆定律建立相称的电压和电流的电阻。具体来说，V = IR电阻的电流流动，如果在它两端的电压下降，或V=_IR方向，如果在该电阻的电流流是在它两端的电压上升方向。 通过结合对权力的方程，P = VI，欧姆定律，我们可以判断一个电阻吸收的功率：P = I2R= U2/ R 电路节点和封闭路径。节点是一个点，两个或两个以上的电路元件加入。当只有两个元素连接，形成一个节点，他们表示将在系列。一个闭合的路径是通过连接元件追溯到一个循环，起点和终点在同一节点，只有一次每遇到中间节点。 电路是说，要解决时，两端的电压，并在每个元素的电流已经确定。欧姆定律是一个重要的方程，得出这样的解决方案。 在简单的电路结构，欧姆定律是足以解决两端的电压，目前在每一个元素。然而，对于更复杂的互连，我们需要使用两个更为重要的代数关系，被称为基尔霍夫定律，来解决所有的电压和电流。 基尔霍夫电流定律是： 在电路中的任何一个节点电流的代数和等于零。 基尔霍夫电压定律是： 电路中的任何封闭路径上的电压的代数和等于零。 1.2电路分析技术 到目前为止，我们已经分析应用结合欧姆定律基尔霍夫定律电阻电路相对简单。所有的电路，我们可以使用这种方法，但因为他们而变得结构更为复杂，涉及到越来越多的元素，这种直接的方法很快成为累赘。在这一课中，我们介绍两个电路分析的强大的技术援助：在复杂的电路结构的分析节点电压的方法，并网电流的方
N. , . School , National Technical University, 15780 Athens, Greece 13 2003; 20 2003; 27 2004 10 2004 , a . , . , . , , . , , . , , . . . , ; . . . . . , , , , . ( , , , .) . . , . . . , . , . ( ). a ; . , . , a . . , . . a a . , , : ●( ), ●, ●, ●, ●, ●, , ●. , , , , , , , , a , . . , , (, 1991). . A , ( 250,000 ) a ( 10,000 ). . , , a , ’s (,1993). , ’s . , ( ) , . , , (, , & , 2002). ( ) . : ●, , ●, ●,
. , a . , , o? . 基于互联网的连锁企业的物流管理系统 N. ，. 化工学院，国立技术大学，15780雅典，希腊 收到2003年9月13日，在经修订的形式收到的2003年12月20号，接受 2004年1月27日 可在线二〇〇四年十二月十日 翻译曹蓝 发展基于互联网的应用工具 服务提供的商业景观的新机会，促进全球市场在业务快速推出创新的产品
和客户提供更好的服务。无论是企业需要的是，服务可以灵活地满足需求，并允许加速外包。反过来，开发人员可以专注于构建核心竞争力，创造客户和股东价值。应用程序开发，也更有效，因为现有的服务，无论他们在那里开发的，可以很容易地重用。 对网络服务的技术要求，很多今天存在的，如营业标准，业务应用，关键任务交易平台和安全的一体化和信息产品。不过，为使强大和动态系统的综合应用，行业标准和工具，扩大天的业务能力，对企业的互操作性是必需的。在采取了充分利用网络服务的关键是要了解什么是服务，以及如何在市场可能发生变化。人们需要能够在今天的平台和应用的投资，使开发人员快速而有效地实现这些好处，也能够满足特定需求，提高企业的生产力。 通常，有两种实施处理时，互联网的应用程序，即基于服务器和基本技术，基于客户的。这两种技术 有自己的长处对代码的发展和它们所提供的设施。服务器的应用程序涉及的动态创建的网页的发展。这些网页传送给客户端的网络浏览器和包含在和语言形式的代码。部分的的网页，其中包含形式和用户需求和的部分控制部分是静态页面的动态部分。通常情况下，代码的结构完全可以通过干预机制的服务器上的改变增加 传动部分和服务器实现基于如，，和语言等，这涉及到一个综合的动态网页应用程序开发的用户希望有关问题的特殊性（计算最短路径，执行路由算法，处理与数据库，等）是通过适当援引这些网页的动态内容的不同部分。在基于服务器的所有应用 计算在服务器上执行。在客户端的应用程序，小程序为准。用户的通信保障由著名的的机制，充当用户的代码。 一切都执行在客户端。在这种情况下的数据必须被检索，一次，这可能是费时的交易的一部分。在服务器的应用程序，服务器资源是所有计算中，这就要求有关的硬件和软件功能强大的服务器设施。基于客户端的应用程序与数据传输负担（主要是与道路网络数据）。有一个该补救方法，即缓存。一旦加载，他们留在浏览器的快取档案将在需要时立即召回。 就我们而言，客户端的应用程序的开发。主要的原因是从有关个人资料的
附录A The Cold Chain and its Logistics Authors: Dr. Jean-Paul Rodriguez and Dr. Theo Notteboom 1. Overview While Globalization has made the relative distance between regions of the world much smaller, the physical separation of these same regions is still a very important reality. The greater the physical separation, the more likely freight can be damaged in one of the complex transport operations involved. Some goods can be damaged by shocks while others can be damaged by undue temperature variations. For a range of goods labeled as perishables, particularly food, their quality degrades with time since they maintain chemical reactions which rate can be mostly mitigated with lower temperatures. It takes time and coordination to efficiently move a shipment and every delay can have negative consequences, notably if this cargo is perishable. To ensure that cargo does not become damaged or compromised throughout this process, businesses in the pharmaceutical, medical and food industries are increasingly relying on the cold chain technology. The cold chain refers to the transportation of temperature sensitive products along a supply chain through thermal and refrigerated packaging methods and the logistical planning to protect the integrity of these shipments. Specialization has led many companies to not only rely on major shipping service providers such as the United Parcel Service (UPS) and FEDEX, but also more focused industry specialists that have developed a niche logistical expertise around the shipping of temperature sensitive products. The potential to understand local rules, customs and environmental conditions as well as an estimation of the length and time of a distribution route make them an important factor in global trade. As a result, the logistics industry is experiencing a growing level of specialization and segmentation of cold chain shipping in several potential niche markets within global commodity chains. Whole new segments of the distribution industry have been very active in taking advantage of the dual development of the spatial extension of
外文翻译 题目：电力电子技术二 A部分 晶闸管 在晶闸管的工作状态，电流从阳极流向阴极。在其关闭状态，晶闸管可以阻止正向 导电，使其不能运行。 可触发晶闸管能使导通状态的正向电流在短时间内使设备处于阻断状态。使正向电压下降到只有导通状态的几伏（通常为1至3伏电压依赖于阻断电压的速度）。 一旦设备开始进行，闸极电流将被隔离。晶闸管不可能被闸关闭，但是可以作为一个二极管。在电路的中，只有当电流处于消极状态，才能使晶闸管处于关闭状态，且电流降为零。在设备运行的时间内，允许闸在运行的控制状态直到器件在可控时间再次进入正向阻断状态。 在逆向偏置电压低于反向击穿电压时，晶闸管有微乎其微的漏电流。通常晶闸管的正向额定电压和反向阻断电压是相同的。晶闸管额定电流是在最大范围指定RMS和它是有能力进行平均电流。同样的对于二极管，晶闸管在分析变流器的结构中可以作为理想的设备。在一个阻性负载电路中的应用中，可以控制运行中的电流瞬间传至源电压的正半周期。当晶闸管尝试逆转源电压变为负值时，其理想化二极管电流立刻变成零。 然而，按照数据表中指定的晶闸管，其反向电流为零。在设备不运行的时间中，电流为零，重要的参数变也为零，这是转弯时间区间从零交叉电流电压的参
考。晶闸管必须保持在反向电压，只有在这个时间，设备才有能力阻止它不是处于正向电压导通状态。 如果一个正向电压应用于晶闸管的这段时间已过，设备可能因为过早地启动并有可能导致设备和电路损害。数据表指定晶闸管通过的反向电压在这段期间和超出这段时间外的一个指定的电压上升率。这段期间有时被称为晶闸管整流电路的周期。 根据使用要求，各种类型的晶闸管是可得到的。在除了电压和电流的额定率，转弯时间，和前方的电压降以及其他必须考虑的特性包括电流导通的上升率和在关闭状态的下降率。 1。控制晶闸管阶段。有时称为晶闸管转换器，这些都是用来要是整顿阶段，如为直流和交流电机驱动器和高压直流输电线路应用的电压和电流的驱动。主要设备要求是在大电压、电流导通状态或低通态压降中。这类型的晶闸管的生产晶圆直径到10厘米，其中平均电流目前大约是4000A，阻断电压为5之7KV。 2。逆变级的晶闸管。这些设计有小关断时间，除了低导通状态电压，虽然在设备导通状态电压值较小，可设定为2500V和1500A。他们的关断时间通常在几微秒范围到100μs之间，取决于其阻断电压的速率和通态压降。 3。光控晶闸管。这些会被一束脉冲光纤触发使其被引导到一个特殊的敏感的晶闸管地区。光化的晶闸管触发，是使用在适当波长的光的对硅产生多余的电子空穴。这些晶闸管的主要用途是应用在高电压，如高压直流系统，有许多晶闸管被应用在转换器阀门上。光控晶闸管已经发现的等级，有4kV的3kA，导通状态电压2V、光触发5毫瓦的功率要求。 还有其它一些晶闸管，如辅助型关断晶闸管（关贸总协定），这些晶闸管其他变化，不对称硅可控（ASCR）和反向进行，晶闸管（RCT）的。这些都是应用。 B部分 功率集成电路 功率集成电路的种类 现代半导体功率控制相当数量的电路驱动，除了电路功率器件本身。这些控制电路通常由微处理器控制，其中包括逻辑电路。这种在同一芯片上包含或作
物流配送中心外文文献原稿和译文 北京化工大学北方学院毕业设计(论文)——外文文献原稿和译文 外文文献原稿和译文 原稿 logistics distribution center location factors: (1) the goods distribution and quantity. This is the distribution center and distribution of the object, such as goods source and the future of distribution, history and current and future forecast and development, etc. Distribution center should as far as possible and producer form in the area and distribution short optimization. The quantity of goods is along with the growth of the size distribution and constant growth. Goods higher growth rate, the more demand distribution center location is reasonable and reducing conveying process unnecessary waste. (2) transportation conditions. The location of logistics distribution center should be close to the transportation hub, and to form the logistics distribution center in the process of a proper nodes. In the conditional, distribution center should be as close to the railway station, port and highway. (3) land conditions. Logistics distribution center covers an area of land in increasingly expensive problem today is more and more important. Is the use of the existing land or land again? Land price? Whether to
1. The Definition of Logistics After completing a commercial transaction, logistics will execute the transfer of goods from the supplier( seller) to the customer( buyer) in the most cost-effective manner. This is the definition of logistics. During the transfer process, hardware such as logistics facilities and equipment( logistics carriers) are needed, as well as information control and standardization. In addition, supports from the government and logistics association should be in place. Three major functions of logistics (1) Creating time value: same goods can be valued different at different times. Goods often stop during the transfer process, which is professionally called the storage of logistics. It creates the time value for goods. (2) Creating location value: same goods can be valued differently at different locations. The value added during the transfer process is the location value of logistics. (3) Distribution processing value: sometimes logistics create distribution processing value, which changes the length, thickness and packages of the goods. Like popular saying, “ cutting into smaller parts” is the most commonly seen distribution processing within logistics create added value for goods. 2. Logistics is a new commercial area, developing from the traditional stage to a modern one. The main differences between these two stage include:
疫苗供应链和冷链物流运输外文翻译2020 英文 Cold chain transportation decision in the vaccine supply chain Benjamin Lev Abstract Vaccines are a special kind of drug, the quality of which is highly sensitive to temperature and directly related to public health. Recently, numerous vaccine-related adverse events have occurred in the world, especially in developing countries, due to vaccines being exposed to inappropriate temperatures during their transportation. This paper considers the vaccine supply chain including a distributor and a retailer (hospital or clinic). The distributor decides to use a cold chain or non-cold chain to transport the vaccines. The retailer performs an inspection when receiving the vaccines. First, a basic model is developed to study the conditions under which the distributor will transport the vaccines via a cold chain or non-cold chain. Then, two common inspection policies (a single-step one and a two-step one) are introduced into the basic model to explore the impact of the retailer's inspection at the end of transportation on the distributor's original decision. We show that the retailer's single-step inspection influences the distributor to choose the cold chain option. Interestingly, we prove that the two-step inspection policy is less effective than the single-step one in this effect. We suggest that the
文献出处：Barattieri A. The mechanism of service trade liberalization[J]. Journal of International Economics, 2014, 92(1): 1-13. （声明：本译文归百度文库所有，完整译文请到百度文库。） 原文 The mechanism of service trade liberalization Barattieri A Abstract In this paper, Service trade liberalization is the key areas of the United States to promote the TPP negotiations, the United States in the negotiations are pushing mechanism of a high standard of service trade liberalization. In this paper the progress of the TPP negotiations and services trade issues important position, on the basis of the acceptance, architecture design, focus on services, regulatory consistency four aspects in the TPP uncovers the "high standards" service trade liberalization mechanism establishment. American "high standards" service trade liberalization mechanism is tailored to the interests of the United States, actually services in the service of the United States. These mechanisms are through to strengthen and promote the TPP platform, forming reversed transmission to other countries. Key words: the TPP; The United States; Service trade liberalization; High standards; Mechanism design America is the first largest exporter global trade in services, and for many years, continues to service trade surplus. Competitive advantage based on service industry and service industry The importance of promoting American exports, jobs and economic growth, the United States in the multilateral, bilateral and regional multiple layers jointly promoting service trade liberalization. In the Uruguay round negotiations, the United States has overcome many obstacles, for the first time to include the Service Trade in multilateral negotiations, contributed to the general Agreement on Trade in services (the Genre - al Agreement on Trade and Service,
(文档含英文原文和中文翻译) 中英文资料外文翻译 原文： As the world energy crisis, and the war and the energy consumption of oil -- and are full of energy, in one day, someday it will disappear without a trace. Oil is not in resources. So in oil consumption must be clean before finding a replacement. With the development of science and technology the progress of
the society, people invented the electric car. Electric cars will become the most ideal of transportation. In the development of world each aspect is fruitful, especially with the automobile electronic technology and computer and rapid development of the information age. The electronic control technology in the car on a wide range of applications, the application of the electronic device, cars, and electronic technology not only to improve and enhance the quality and the traditional automobile electrical performance, but also improve the automobile fuel economy, performance, reliability and emissions purification. Widely used in automobile electronic products not only reduces the cost and reduce the complexity of the maintenance. From the fuel injection engine ignition devices, air control and emission control and fault diagnosis to the body auxiliary devices are generally used in electronic control technology, auto development mainly electromechanical integration. Widely used in automotive electronic control ignition system mainly electronic control fuel injection system, electronic control ignition system, electronic control automatic transmission, electronic control (ABS/ASR) control system,
文献出处：Croxton K.LThe research of fresh food e-commerce logistics distribution modefJ]. The International Journal of Logistics Management, 2017, 1(2): 13-24. 原文 The research of fresh food e-commerce logistics distribution mode Croxton K L Abstract With the development of electronic commerce enterprise, from the Internet shopping has been gradually deep into the people’s life, so that people want to buy on the Internet to be assured that there is an increasing demand or iresh agricultural products. This rare agricultural socialization trend of consumption also offers fresh electronic commerce development opportunities, but now is the actual situation of fresh electronic commerce development is not very optimistic. For fresh food e-commerce，due to the particularity of fresh products, it requires the logistics distribution can be according to the requirements of the customer at the right time to provide enough fresh products，it is for the logistics service quality and time put forward higher requirements，delivery is not yet mature，distribution costs are high，low efficiency and service level is often difficult to guarantee，fresh products logistics distribution is a bottlenecK in the development of them. Keywords: fresh food e-commerce，distribution pattern，cold chain logistics, and risk control 1 Introduction Farmers1markets and supermarkets is the traditional channels of city residents to buy fresh agricultural products, but with the development of social economy speed boost, the rhythm of people’s life in the city than ever also had obvious increase，’’workers?’ due to the limitation of working hours, often the problem is there are very few time at a farmers’ market or supermarket to buy fresh prod uce，even after work at farmers’ markets or supermarkets to buy the fresh agricultural products, can buy goods is not fresh. With the development of electronic commerce enterprise, from the Internet shopping has been gradually deep into the people's life, so that people want to buy on the Internet to be assured that there is an increasing demand of fresh agricultural products，especially for "workers' this is more urgent demand.B2C，C2C e-commerce business now more concentrated in the electronic products, clothing and completely processed food, for the present stage of basic logistics service can satisfy the requirements of web site with the customer.