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毕业论文(设计)外文文献翻译及原文

毕业论文(设计)外文文献翻译及原文

金融体制、融资约束与投资——来自OECD的实证分析R.SemenovDepartment of Economics,University of Nijmegen,Nijmegen(荷兰内梅亨大学,经济学院)这篇论文考查了OECD的11个国家中现金流量对企业投资的影响.我们发现不同国家之间投资对企业内部可获取资金的敏感性具有显著差异,并且银企之间具有明显的紧密关系的国家的敏感性比银企之间具有公平关系的国家的低.同时,我们发现融资约束与整体金融发展指标不存在关系.我们的结论与资本市场信息和激励问题对企业投资具有重要作用这种观点一致,并且紧密的银企关系会减少这些问题从而增加企业获取外部融资的渠道。

一、引言各个国家的企业在显著不同的金融体制下运行。

金融发展水平的差别(例如,相对GDP的信用额度和相对GDP的相应股票市场的资本化程度),在所有者和管理者关系、企业和债权人的模式中,企业控制的市场活动水平可以很好地被记录.在完美资本市场,对于具有正的净现值投资机会的企业将一直获得资金。

然而,经济理论表明市场摩擦,诸如信息不对称和激励问题会使获得外部资本更加昂贵,并且具有盈利投资机会的企业不一定能够获取所需资本.这表明融资要素,例如内部产生资金数量、新债务和权益的可得性,共同决定了企业的投资决策.现今已经有大量考查外部资金可得性对投资决策的影响的实证资料(可参考,例如Fazzari(1998)、 Hoshi(1991)、 Chapman(1996)、Samuel(1998)).大多数研究结果表明金融变量例如现金流量有助于解释企业的投资水平。

这项研究结果解释表明企业投资受限于外部资金的可得性。

很多模型强调运行正常的金融中介和金融市场有助于改善信息不对称和交易成本,减缓不对称问题,从而促使储蓄资金投着长期和高回报的项目,并且提高资源的有效配置(参看Levine(1997)的评论文章)。

因而我们预期用于更加发达的金融体制的国家的企业将更容易获得外部融资.几位学者已经指出建立企业和金融中介机构可进一步缓解金融市场摩擦。

浙江大学本科毕业论文外文文献翻译

浙江大学本科毕业论文外文文献翻译

核准通过,归档资料。

未经允许,请勿外传!浙江大学本科毕业论文外文文献翻译The influence of political connections on the firm value of small and medium-sized enterprises in China政治关联在中国对中小型企业价值的影响1摘要中小型企业的价值受很多因素的影响,比如股东、现金流以及政治关联等.这篇文章调查的正是在中国政治关联对中小型企业价值的影响。

通过实验数据来分析政治关联对企业价值效益的影响.结果表明政府关联是关键的因素并且在中国对中小型企业的价值具有负面影响。

2重要内容翻译2。

1引言在商业界,有越来越多关于政治关联的影响的经济研究。

它们发现政治关联能够帮助企业确保有利的规章条件以及成功获得资源,比如能够最终提高企业价值或是提升绩效的银行贷款,这种政治关联的影响在不同的经济条件下呈现不同的效果。

在高腐败和法律制度薄弱的国家,政治关联对企业价值具有决定性因素1的作用.中国由高度集权的计划经济向市场经济转变,政府对市场具有较强的控制作用,而且有大量的上市企业具有政治关联。

中小型企业发展的很迅速,他们已经在全球经济环境中变得越来越重要。

从90年代起, 政治因素对中国的任何规模的企业来说都变得越来越重要,尤其是中小型企业的价值。

和其他的部门相比较,中小型企业只有较小的现金流,不稳定的现金流且高负债率.一方面,中小型企业改变更加灵活;另一方面,中小型企业在由于企业规模以及对银行来说没有可以抵押的资产,在筹资方面较为困难。

企业如何应对微观经济环境和政策去保证正常的企业活动,并且政治关联如何影响企业价值?这篇论文调查政治关联和企业价值之间的联系,并且试图去研究企业是否可以从政治关联中获利提升企业价值。

2.2定义这些中小型企业之所以叫中小型企业,是和管理规模有关。

对这些小企业来说,雇员很少,营业额较低,资金一般由较少的人提供,因此,通常由这些业主直接管理企业。

毕业论文英文参考文献与译文

毕业论文英文参考文献与译文

Inventory managementInventory ControlOn the so-called "inventory control", many people will interpret it as a "storage management", which is actually a big distortion.The traditional narrow view, mainly for warehouse inventory control of materials for inventory, data processing, storage, distribution, etc., through the implementation of anti-corrosion, temperature and humidity control means, to make the custody of the physical inventory to maintain optimum purposes. This is just a form of inventory control, or can be defined as the physical inventory control. How, then, from a broad perspective to understand inventory control? Inventory control should be related to the company's financial and operational objectives, in particular operating cash flow by optimizing the entire demand and supply chain management processes (DSCM), a reasonable set of ERP control strategy, and supported by appropriate information processing tools, tools to achieved in ensuring the timely delivery of the premise, as far as possible to reduce inventory levels, reducing inventory and obsolescence, the risk of devaluation. In this sense, the physical inventory control to achieve financial goals is just a means to control the entire inventory or just a necessary part; from the perspective of organizational functions, physical inventory control, warehouse management is mainly the responsibility of The broad inventory control is the demand and supply chain management, and the whole company's responsibility.Why until now many people's understanding of inventory control, limited physical inventory control? The following two reasons can not be ignored:First, our enterprises do not attach importance to inventory control. Especially those who benefit relatively good business, as long as there is money on the few people to consider the problem of inventory turnover. Inventory control is simply interpreted as warehouse management, unless the time to spend money, it may have been to see the inventory problem, and see the results are often very simple procurement to buy more, or did not do warehouse departments .Second, ERP misleading. Invoicing software is simple audacity to call it ERP, companies on their so-called ERP can reduce the number of inventory, inventory control, seems to rely on their small software can get. Even as SAP, BAAN ERP world, the field ofthese big boys, but also their simple modules inside the warehouse management functionality is defined as "inventory management" or "inventory control." This makes the already not quite understand what our inventory control, but not sure what is inventory control.In fact, from the perspective of broadly understood, inventory control, shouldinclude the following:First, the fundamental purpose of inventory control. We know that the so-called world-class manufacturing, two key assessment indicators (KPI) is, customer satisfaction and inventory turns, inventory turns and this is actually the fundamental objective of inventory control.Second, inventory control means. Increase inventory turns, relying solely on the so-called physical inventory control is not enough, it should be the demand and supply chain management process flow of this large output, and this big warehouse management processes in addition to including this link, the more important The section also includes: forecasting and order processing, production planning and control, materials planning and purchasing control, inventory planning and forecasting in itself, as well as finished products, raw materials, distribution and delivery of the strategy, and even customs management processes.And with the demand and supply chain management processes throughout the process, it is the information flow and capital flow management. In other words, inventory itself is across the entire demand and supply management processes in all aspects of inventory control in order to achieve the fundamental purpose, it must control all aspects of inventory, rather than just manage the physical inventory at hand.Third, inventory control, organizational structure and assessment.Since inventory control is the demand and supply chain management processes, output, inventory control to achieve the fundamental purpose of this process must be compatible with a rational organizational structure. Until now, we can see that many companies have only one purchasing department, purchasing department following pipe warehouse. This is far short of inventory control requirements. From the demand and supply chain management process analysis, we know that purchasing and warehouse management is the executive arm of the typical, and inventory control should focus on prevention, the executive branch is very difficult to "prevent inventory" for the simple reason that they assessment indicatorsin large part to ensure supply (production, customer). How the actual situation, a reasonable demand and supply chain management processes, and thus set the corresponding rational organizational structure and is a question many of our enterprisesto exploreThe role of inventory controlInventory management is an important part of business management. In the production and operation activities, inventory management must ensure that both the production plant for raw materials, spare parts demand, but also directly affect the purchasing, sales of share, sales activities. To make an inventory of corporate liquidity, accelerate cash flow, the security of supply under the premise of minimizing Yaku funds, directly affects the operational efficiency. Ensure the production and operation needs of the premise, so keep inventories at a reasonable level; dynamic inventory control, timely, appropriate proposed order to avoid over storage or out of stock; reduce inventory footprint, lower total cost of inventory; control stock funds used to accelerate cash flow.Problems arising from excessive inventory: increased warehouse space andinventory storage costs, thereby increasing product costs; take a lot of liquidity, resultingin sluggish capital, not only increased the burden of payment of interest, etc., would affect the time value of money and opportunity income; finished products and raw materials caused by physical loss and intangible losses; a large number of enterprise resource idle, affecting their rational allocation and optimization; cover the production, operation of the whole process of the various contradictions and problems, is not conducive to improve the management level.Inventory is too small the resulting problems: service levels caused a decline in the profit impact of marketing and corporate reputation; production system caused by inadequate supply of raw materials or other materials, affecting the normal production process; to shorten lead times, increase the number of orders, so order (production) costs; affect the balance of production and assembly of complete sets.NotesInventory management should particularly consider the following two questions:First, according to sales plans, according to the planned production of the goods circulated in the market, we should consider where, how much storage.Second, starting from the level of service and economic benefits to determine howto ensure inventories and supplementary questions.The two problems with the inventory in the logistics process functions.In general, the inventory function:(1)to prevent interrupted. Received orders to shorten the delivery of goods fromthe time in order to ensure quality service, at the same time to prevent out of stock.(2)to ensure proper inventory levels, saving inventory costs.(3)to reduce logistics costs. Supplement with the appropriate time interval compatible with the reasonable demand of the cargo in order to reduce logistics costs, eliminate or avoid sales fluctuations.(4)ensure the production planning, smooth to eliminate or avoid sales fluctuations.(5)display function.(6)reserve. Mass storage when the price falls, reduce losses, to respond to disasters and other contingencies.About the warehouse (inventory) on what the question, we must consider the number and location. If the distribution center, it should be possible according to customer needs, set at an appropriate place; if it is stored in central places to minimize the complementary principle to the distribution centers, there is no place certain requirements. When the stock base is established, will have to take into account are stored in various locations in what commodities.库存管理库存控制在谈到所谓“库存控制”的时候,很多人将其理解为“仓储管理”,这实际上是个很大的曲解。

会计学毕业论文中英文资料外文翻译文献

会计学毕业论文中英文资料外文翻译文献

会计学中英文资料外文翻译外文原文Title:Future of SME finance(Background – the environment for SME finance has changedFuture economic recovery will depend on the possibility of Crafts, Trades and SMEs to exploit their potential for growth and employment creation.SMEs make a major contribution to growth and employment in the EU and are at the heart of the Lisbon Strategy, whose main objective is to turn Europe into the most competitive and dynamic knowledge-based economy in the world. However, the ability of SMEs to grow depends highly on their potential to invest in restructuring, innovation and qualification. All of these investments need capital and therefore access to finance.Against this background the consistently repeated complaint of SMEs about their problems regarding access to finance is a highly relevant constraint that endangers the economic recovery of Europe.Changes in the finance sector influence the behavior of credit institutes towards Crafts, Trades and SMEs. Recent and ongoing developments in the banking sector add to the concerns of SMEs and will further endanger their access to finance. The main changes in the banking sector which influence SME finance are:•Globalization and internationalization have increased the competition and the profit orientation in the sector;•worsening of the economic situations in some institutes (burst of the ITC bubble, insolvencies) strengthen the focus on profitability further;•Mergers and restructuring created larger structures and many local branches, which had direct and personalized contacts with small enterprises, were closed;•up-coming implementation of new capital adequacy rules (Basel II) will also change SME business of the credit sector and will increase its administrative costs;•Stricter interpretation of State-Aide Rules by the European Commission eliminates the support of banks by public guarantees; many of the effected banks arevery active in SME finance.All these changes result in a higher sensitivity for risks and profits in the finance sector.The changes in the finance sector affect the accessibility of SMEs to finance.Higher risk awareness in the credit sector, a stronger focus on profitability and the ongoing restructuring in the finance sector change the framework for SME finance and influence the accessibility of SMEs to finance. The most important changes are: •In order to make the higher risk awareness operational, the credit sector introduces new rating systems and instruments for credit scoring;•Risk assessment of SMEs by banks will force the enterprises to present more and better quality information on their businesses;•Banks will try to pass through their additional costs for implementing and running the new capital regulations (Basel II) to their business clients;•due to the increase of competition on interest rates, the bank sector demands more and higher fees for its services (administration of accounts, payments systems, etc.), which are not only additional costs for SMEs but also limit their liquidity;•Small enterprises will lose their personal relationship with decision-makers in local branches –the credit application process will become more formal and anonymous and will probably lose longer;•the credit sector will lose more and more its “public function” to provide access to finance for a wide range of economic actors, which it has in a number of countries, in order to support and facilitate economic growth; the profitability of lending becomes the main focus of private credit institutions.All of these developments will make access to finance for SMEs even more difficult and / or will increase the cost of external finance. Business start-ups and SMEs, which want to enter new markets, may especially suffer from shortages regarding finance. A European Code of Conduct between Banks and SMEs would have allowed at least more transparency in the relations between Banks and SMEs and UEAPME regrets that the bank sector was not able to agree on such a commitment.Towards an encompassing policy approach to improve the access of Crafts, Trades and SMEs to financeAll analyses show that credits and loans will stay the main source of finance forthe SME sector in Europe. Access to finance was always a main concern for SMEs, but the recent developments in the finance sector worsen the situation even more. Shortage of finance is already a relevant factor, which hinders economic recovery in Europe. Many SMEs are not able to finance their needs for investment.Therefore, UEAPME expects the new European Commission and the new European Parliament to strengthen their efforts to improve the framework conditions for SME finance. Europe’s Crafts, Trades and SMEs ask for an encompassing policy approach, which includes not only the conditions for SMEs’ access to lending, but will also strengthen their capacity for internal finance and their access to external risk capital.From UEAPME’s point of view such an encompassing approach should be based on three guiding principles:•Risk-sharing between private investors, financial institutes, SMEs and public sector;•Increase of transparency of SMEs towards their external investors and lenders;•improving the regulatory environment for SME finance.Based on these principles and against the background of the changing environment for SME finance, UEAPME proposes policy measures in the following areas:1. New Capital Requirement Directive: SME friendly implementation of Basel IIDue to intensive lobbying activities, UEAPME, together with other Business Associations in Europe, has achieved some improvements in favour of SMEs regarding the new Basel Agreement on regulatory capital (Basel II). The final agreement from the Basel Committee contains a much more realistic approach toward the real risk situation of SME lending for the finance market and will allow the necessary room for adaptations, which respect the different regional traditions and institutional structures.However, the new regulatory system will influence the relations between Banks and SMEs and it will depend very much on the way it will be implemented into European law, whether Basel II becomes burdensome for SMEs and if it will reduce access to finance for them.The new Capital Accord form the Basel Committee gives the financial marketauthorities and herewith the European Institutions, a lot of flexibility. In about 70 areas they have room to adapt the Accord to their specific needs when implementing it into EU law. Some of them will have important effects on the costs and the accessibility of finance for SMEs.UEAPME expects therefore from the new European Commission and the new European Parliament:•The implementation of the new Capital Requirement Directive will be costly for the Finance Sector (up to 30 Billion Euro till 2006) and its clients will have to pay for it. Therefore, the implementation – especially for smaller banks, which are often very active in SME finance –has to be carried out with as little administrative burdensome as possible (reporting obligations, statistics, etc.).•The European Regulators must recognize traditional instruments for collaterals (guarantees, etc.) as far as possible.•The European Commission and later the Member States should take over the recommendations from the European Parliament with regard to granularity, access to retail portfolio, maturity, partial use, adaptation of thresholds, etc., which will ease the burden on SME finance.2. SMEs need transparent rating proceduresDue to higher risk awareness of the finance sector and the needs of Basel II, many SMEs will be confronted for the first time with internal rating procedures or credit scoring systems by their banks. The bank will require more and better quality information from their clients and will assess them in a new way. Both up-coming developments are already causing increasing uncertainty amongst SMEs.In order to reduce this uncertainty and to allow SMEs to understand the principles of the new risk assessment, UEAPME demands transparent rating procedures –rating procedures may not become a “Black Box” for SMEs:•The bank should communicate the relevant criteria affecting the rating of SMEs.•The bank should inform SMEs about its assessment in order to allow SMEs to improve.The negotiations on a European Code of Conduct between Banks and SMEs , which would have included a self-commitment for transparent rating procedures by Banks, failed. Therefore, UEAPME expects from the new European Commission andthe new European Parliament support for:•binding rules in the framework of the new Capital Adequacy Directive, which ensure the transparency of rating procedures and credit scoring systems for SMEs;•Elaboration of national Codes of Conduct in order to improve the relations between Banks and SMEs and to support the adaptation of SMEs to the new financial environment.3. SMEs need an extension of credit guarantee systems with a special focus on Micro-LendingBusiness start-ups, the transfer of businesses and innovative fast growth SMEs also depended in the past very often on public support to get access to finance. Increasing risk awareness by banks and the stricter interpretation of State Aid Rules will further increase the need for public support.Already now, there are credit guarantee schemes in many countries on the limit of their capacity and too many investment projects cannot be realized by SMEs.Experiences show that Public money, spent for supporting credit guarantees systems, is a very efficient instrument and has a much higher multiplying effect than other instruments. One Euro form the European Investment Funds can stimulate 30 Euro investments in SMEs (for venture capital funds the relation is only 1:2).Therefore, UEAPME expects the new European Commission and the new European Parliament to support:•The extension of funds for national credit guarantees schemes in the framework of the new Multi-Annual Programmed for Enterprises;•The development of new instruments for securitizations of SME portfolios;•The recognition of existing and well functioning credit guarantees schemes as collateral;•More flexibility within the European Instruments, because of national differences in the situation of SME finance;•The development of credit guarantees schemes in the new Member States;•The development of an SBIC-like scheme in the Member States to close the equity gap (0.2 – 2.5 Mio Euro, according to the expert meeting on PACE on April 27 in Luxemburg).•the development of a financial support scheme to encourage the internalizations of SMEs (currently there is no scheme available at EU level:termination of JOP, fading out of JEV).4. SMEs need company and income taxation systems, which strengthen their capacity for self-financingMany EU Member States have company and income taxation systems with negative incentives to build-up capital within the company by re-investing their profits. This is especially true for companies, which have to pay income taxes. Already in the past tax-regimes was one of the reasons for the higher dependence of Europe’s SMEs on bank lending. In future, the result of rating will also depend on the amount of capital in the company; the high dependence on lending will influence the access to lending. This is a vicious cycle, which has to be broken.Even though company and income taxation falls under the competence of Member States, UEAPME asks the new European Commission and the new European Parliament to publicly support tax-reforms, which will strengthen the capacity of Crafts, Trades and SME for self-financing. Thereby, a special focus on non-corporate companies is needed.5. Risk Capital – equity financingExternal equity financing does not have a real tradition in the SME sector. On the one hand, small enterprises and family business in general have traditionally not been very open towards external equity financing and are not used to informing transparently about their business.On the other hand, many investors of venture capital and similar forms of equity finance are very reluctant regarding investing their funds in smaller companies, which is more costly than investing bigger amounts in larger companies. Furthermore it is much more difficult to set out of such investments in smaller companies.Even though equity financing will never become the main source of financing for SMEs, it is an important instrument for highly innovative start-ups and fast growing companies and it has therefore to be further developed. UEAPME sees three pillars for such an approach where policy support is needed:Availability of venture capital•The Member States should review their taxation systems in order to create incentives to invest private money in all forms of venture capital.•Guarantee instruments for equity financing should be further developed.Improve the conditions for investing venture capital into SMEs•The development of secondary markets for venture capital investments inSMEs should be supported.•Accounting Standards for SMEs should be revised in order to ease transparent exchange of information between investor and owner-manager.Owner-managers must become more aware about the need for transparency towards investors•SME owners will have to realise that in future access to external finance (venture capital or lending) will depend much more on a transparent and open exchange of information about the situation and the perspectives of their companies.•In order to fulfil the new needs for transparency, SMEs will have to use new information instruments (business plans, financial reporting, etc.) and new management instruments (risk-management, financial management, etc.).外文资料翻译题目:未来的中小企业融资背景:中小企业融资已经改变未来的经济复苏将取决于能否工艺品,贸易和中小企业利用其潜在的增长和创造就业。

毕业论文外文翻译(中英文)

毕业论文外文翻译(中英文)

译文交通拥堵和城市交通系统的可持续发展摘要:城市化和机动化的快速增长,通常有助于城市交通系统的发展,是经济性,环境性和社会可持续性的体现,但其结果是交通量无情增加,导致交通拥挤。

道路拥挤定价已经提出了很多次,作为一个经济措施缓解城市交通拥挤,但还没有见过在实践中广泛使用,因为道路收费的一些潜在的影响仍然不明。

本文首先回顾可持续运输系统的概念,它应该满足集体经济发展,环境保护和社会正义的目标.然后,根据可持续交通系统的特点,使拥挤收费能够促进经济增长,环境保护和社会正义.研究结果表明,交通拥堵收费是一个切实有效的方式,可以促进城市交通系统的可持续发展。

一、介绍城市交通是一个在世界各地的大城市迫切关注的话题.随着中国的城市化和机动化的快速发展,交通拥堵已成为一个越来越严重的问题,造成较大的时间延迟,增加能源消耗和空气污染,减少了道路网络的可靠性。

在许多城市,交通挤塞情况被看作是经济发展的障碍.我们可以使用多种方法来解决交通挤塞,包括新的基础设施建设,改善基础设施的维护和操作,并利用现有的基础设施,通过需求管理策略,包括定价机制,更有效地减少运输密度.交通拥堵收费在很久以前就已提出,作为一种有效的措施,来缓解的交通挤塞情况.交通拥堵收费的原则与目标是通过对选择在高峰拥挤时段的设施的使用实施附加收费,以纾缓拥堵情况。

转移非高峰期一些出行路线,远离拥挤的设施或高占用车辆,或完全阻止一些出行,交通拥堵收费计划将在节省时间和降低经营成本的基础上,改善空气中的质量,减少能源消耗和改善过境生产力。

此计划在世界很多国家和地方都有成功的应用.继在20世纪70年代初和80年代中期挪威与新加坡实行收费环,在2003年2月伦敦金融城推出了面积收费;直至现在,它都是已经开始实施拥挤收费的大都市圈中一个最知名的例子。

然而,交通拥堵收费由于理论和政治的原因未能在实践中广泛使用。

道路收费的一些潜在的影响尚不清楚,和城市发展的拥塞定价可持续性,需要进一步研究。

毕业论文文献外文翻译----危机管理:预防,诊断和干预文献翻译-中英文文献对照翻译

毕业论文文献外文翻译----危机管理:预防,诊断和干预文献翻译-中英文文献对照翻译

第1页 共19页中文3572字毕业论文(设计)外文翻译标题:危机管理-预防,诊断和干预一、外文原文标题:标题:Crisis management: prevention, diagnosis and Crisis management: prevention, diagnosis andintervention 原文:原文:The Thepremise of this paper is that crises can be managed much more effectively if the company prepares for them. Therefore, the paper shall review some recent crises, theway they were dealt with, and what can be learned from them. Later, we shall deal with the anatomy of a crisis by looking at some symptoms, and lastly discuss the stages of a crisis andrecommend methods for prevention and intervention. Crisis acknowledgmentAlthough many business leaders will acknowledge thatcrises are a given for virtually every business firm, many of these firms do not take productive steps to address crisis situations. As one survey of Chief Executive officers of Fortune 500 companies discovered, 85 percent said that a crisisin business is inevitable, but only 50 percent of these had taken any productive action in preparing a crisis plan(Augustine, 1995). Companies generally go to great lengths to plan their financial growth and success. But when it comes to crisis management, they often fail to think and prepare for those eventualities that may lead to a company’s total failure.Safety violations, plants in need of repairs, union contracts, management succession, and choosing a brand name, etc. can become crises for which many companies fail to be prepared untilit is too late.The tendency, in general, is to look at the company as a perpetual entity that requires plans for growth. Ignoring the probabilities of disaster is not going to eliminate or delay their occurrences. Strategic planning without inclusion ofcrisis management is like sustaining life without guaranteeinglife. One reason so many companies fail to take steps to proactively plan for crisis events, is that they fail to acknowledge the possibility of a disaster occurring. Like an ostrich with its head in the sand, they simply choose to ignorethe situation, with the hope that by not talking about it, it will not come to pass. Hal Walker, a management consultant, points out “that decisions will be more rational and better received, and the crisis will be of shorter duration, forcompanies who prepare a proactive crisis plan” (Maynard, 1993) .It is said that “there are two kinds of crises: those that thatyou manage, and those that manage you” (Augustine, 1995). Proactive planning helps managers to control and resolve a crisis. Ignoring the possibility of a crisis, on the other hand,could lead to the crisis taking a life of its own. In 1979, theThree-Mile Island nuclear power plant experienced a crisis whenwarning signals indicated nuclear reactors were at risk of a meltdown. The system was equipped with a hundred or more different alarms and they all went off. But for those who shouldhave taken the necessary steps to resolve the situation, therewere no planned instructions as to what should be done first. Hence, the crisis was not acknowledged in the beginning and itbecame a chronic event.In June 1997, Nike faced a crisis for which they had no existi existing frame of reference. A new design on the company’s ng frame of reference. A new design on the company’s Summer Hoop line of basketball shoes - with the word air writtenin flaming letters - had sparked a protest by Muslims, who complained the logo resembled the Arabic word for Allah, or God.The council of American-Islamic Relations threatened aa globalNike boycott. Nike apologized, recalled 38,000 pairs of shoes,and discontinued the line (Brindley, 1997). To create the brand,Nike had spent a considerable amount of time and money, but hadnever put together a general framework or policy to deal with such controversies. To their dismay, and financial loss, Nike officials had no choice but to react to the crisis. This incident has definitely signaled to the company that spending a little more time would have prevented the crisis. Nonetheless,it has taught the company a lesson in strategic crisis management planning.In a business organization, symptoms or signals can alert the strategic planners or executives of an eminent crisis. Slipping market share, losing strategic synergy anddiminishing productivity per man hour, as well as trends, issues and developments in the socio-economic, political and competitive environments, can signal crises, the effects of which can be very detrimental. After all, business failures and bankruptcies are not intended. They do not usually happen overnight. They occur more because of the lack of attention to symptoms than any other factor.Stages of a crisisMost crises do not occur suddenly. The signals can usuallybe picked up and the symptoms checked as they emerge. A company determined to address these issues realizes that the real challenge is not just to recognize crises, but to recognize themin a timely fashion (Darling et al., 1996). A crisis can consistof four different and distinct stages (Fink, 1986). The phasesare: prodromal crisis stage, acute crisis stage, chronic crisisstage and crisis resolution stage.Modern organizations are often called “organic” due tothe fact that they are not immune from the elements of their surrounding environments. Very much like a living organism, organizations can be affected by environmental factors both positively and negatively. But today’s successfulorganizations are characterized by the ability to adapt by recognizing important environmental factors, analyzing them, evaluating the impacts and reacting to them. The art of strategic planning (as it relates to crisis management)involves all of the above activities. The right strategy, in general, provides for preventive measures, and treatment or resolution efforts both proactively and reactively. It wouldbe quite appropriate to examine the first three stages of acrisis before taking up the treatment, resolution or intervention stage.Prodromal crisis stageIn the field of medicine, a prodrome is a symptom of the onset of a disease. It gives a warning signal. In business organizations, the warning lights are always blinking. No matter how successful the organization, a number of issues andtrends may concern the business if proper and timely attentionis paid to them. For example, in 1995, Baring Bank, a UK financial institution which had been in existence since 1763,ample opportunitysuddenly and unexpectedly failed. There wasfor the bank to catch the signals that something bad was on thehorizon, but the company’s efforts to detect that were thwarted by an internal structure that allowed a single employee both to conduct and to oversee his own investment trades, and the breakdown of management oversight and internalcontrol systems (Mitroff et al., 1996). Likewise, looking in retrospect, McDonald’s fast food chain was given the prodromalsymptoms before the elderly lady sued them for the spilling ofa very hot cup of coffee on her lap - an event that resulted in a substantial financial loss and tarnished image of thecompany. Numerous consumers had complained about thetemperature of the coffee. The warning light was on, but the company did not pay attention. It would have been much simplerto pick up the signal, or to check the symptom, than facing the consequences.In another case, Jack in the Box, a fast food chain, had several customers suffer intestinal distress after eating at their restaurants. The prodromal symptom was there, but the company took evasive action. Their initial approach was to lookaround for someone to blame. The lack of attention, the evasiveness and the carelessness angered all the constituent groups, including their customers. The unfortunate deaths thatptoms,occurred as a result of the company’s ignoring thesymand the financial losses that followed, caused the company to realize that it would have been easier to manage the crisis directly in the prodromal stage rather than trying to shift theblame.Acute crisis stageA prodromal stage may be oblique and hard to detect. The examples given above, are obvious prodromal, but no action wasWebster’s New Collegiate Dictionary, an acute stage occursacutewhen a symptom “demands urgent attention.” Whether the acutesymptom emerges suddenly or is a transformation of a prodromalstage, an immediate action is required. Diverting funds and other resources to this emerging situation may cause disequilibrium and disturbance in the whole system. It is onlythose organizations that have already prepared a framework forthese crises that can sustain their normal operations. For example, the US public roads and bridges have for a long time reflected a prodromal stage of crisis awareness by showing cracks and occasionally a collapse. It is perhaps in light of the obsessive decision to balance the Federal budget that reacting to the problem has been delayed and ignored. This situation has entered an acute stage and at the time of this writing, it was reported that a bridge in Maryland had just collapsed.The reason why prodromes are so important to catch is thatit is much easier to manage a crisis in this stage. In the caseof most crises, it is much easier and more reliable to take careof the problem before it becomes acute, before it erupts and causes possible complications (Darling et al., 1996). In andamage. However, the losses are incurred. Intel, the largest producer of computer chips in the USA, had to pay an expensiveprice for initially refusing to recall computer chips that proved unreliable o n on certain calculations. The f irmfirm attempted to play the issue down and later learned its lesson. At an acutestage, when accusations were made that the Pentium Chips were not as fast as they claimed, Intel quickly admitted the problem,apologized for it, and set about fixing it (Mitroff et al., 1996). Chronic crisis stageDuring this stage, the symptoms are quite evident and always present. I t isIt is a period of “make or break.” Being the third stage, chronic problems may prompt the company’s management to once and for all do something about the situation. It may be the beginning of recovery for some firms, and a deathknell for others. For example, the Chrysler Corporation was only marginallysuccessful throughout the 1970s. It was not, however, until the company was nearly bankrupt that amanagement shake-out occurred. The drawback at the chronic stage is that, like in a human patient, the company may get used to “quick fixes” and “band “band--aid”approaches. After all, the ailment, the problem and the crisis have become an integral partoverwhelmed by prodromal and acute problems that no time or attention is paid to the chronic problems, or the managers perceive the situation to be tolerable, thus putting the crisison a back burner.Crisis resolutionCrises could be detected at various stages of their development. Since the existing symptoms may be related todifferent problems or crises, there is a great possibility thatthey may be misinterpreted. Therefore, the people in charge maybelieve they have resolved the problem. However, in practicethe symptom is often neglected. In such situations, the symptomwill offer another chance for resolution when it becomes acute,thereby demanding urgent care. Studies indicate that today anincreasing number of companies are issue-oriented and searchfor symptoms. Nevertheless, the lack of experience in resolvinga situation and/or inappropriate handling of a crisis can leadto a chronic stage. Of course, there is this last opportunityto resolve the crisis at the chronic stage. No attempt to resolve the crisis, or improper resolution, can lead to grim consequences that will ultimately plague the organization or even destroy it.It must be noted that an unsolved crisis may not destroy the company. But, its weakening effects can ripple through the organization and create a host of other complications.Preventive effortsThe heart of the resolution of a crisis is in the preventiveefforts the company has initiated. This step, similar to a humanbody, is actually the least expensive, but quite often the mostoverlooked. Preventive measures deal with sensing potential problems (Gonzales-Herrero and Pratt, 1995). Major internalfunctions of a company such as finance, production, procurement, operations, marketing and human resources are sensitive to thesocio-economic, political-legal, competitive, technological, demographic, global and ethical factors of the external environment. What is imminently more sensible and much more manageable, is to identify the processes necessary forassessing and dealing with future crises as they arise (Jacksonand Schantz, 1993). At the core of this process are appropriate information systems, planning procedures, anddecision-making techniques. A soundly-based information system will scan the environment, gather appropriate data, interpret this data into opportunities and challenges, and provide a concretefoundation for strategies that could function as much to avoid crises as to intervene and resolve them.Preventive efforts, as stated before, require preparations before any crisis symptoms set in. Generally strategic forecasting, contingency planning, issues analysis, and scenario analysis help to provide a framework that could be used in avoiding and encountering crises.出处:出处:Toby TobyJ. Kash and John R. Darling . Crisis management: prevention, diagnosis 179-186二、翻译文章标题:危机管理:预防,诊断和干预译文:本文的前提是,如果该公司做好准备得话,危机可以更有效地进行管理。

法学毕业论文法学外文翻译中英文对照

法学毕业论文法学外文翻译中英文对照

英文原文:How Real Is China’s Real Estate Bubble And WhatShould Be Done about ItThink U.S. housing prices havegone berserk?Try tho se in Shanghai and Beijing, where the cost ofhomes has been rising an estimated 25%annually in recent years。

Th at’stwice the jump in the median sale priceof existi ng U。

S. homes over the past year, and a sign thatCh ina’s real estate market is in the midst ofwhat some observers view as a potentially explosive bubble.The bubble is rooted insuch factors as China's strong economic growth since 1990 and investor bets that China’s currency, the yuan, will be revalued upward in the near future. But such speculation is helping push the price of homes beyond thereach of middle class citizens in key Chinese cities and raising the prospect ofasudden market collapsethat could threaten thecountry's shaky bank ing sector and wipe out thelife savings of manyfamilies。

毕业论文英文文献及翻译

毕业论文英文文献及翻译

毕业论文英文文献及翻译————————————————————————————————作者:————————————————————————————————日期:Based on GSM module and AT89C51 connectiondesign and application---From 《GSM principle and its network optimization》chapter one---From 《New single chip microcomputer interface device and technology》chapter sixAbstractThis article through analyzed the GSM module and the monolithic integrated circuit connection design simply introduced the TC35i module commonly used instruction and the coding rule, introduced emphatically the TC35i module and the AT89C51 principle of work, the periphery connection electric circuit, the software control technology, at the same time has produced some TC35i module and the AT89C51 connection application procedure, proposed AT89C51 when receive data should pay attention question, thus designed has the GSM module the data transmission terminal.Key words: GSM network1 Summarize:Along with correspondence technique of development, according to the service function of the NTT DoCoMo net, just to industry control and control from a distance the realm have continuously extension of trend.Is orientation this kind of demand, Siemens company released a new generation wireless correspondence GSM mold piece-TC35i, according to should the short news function of the mold piece, can fast safety credibility realization customer information processing etc. function, special be applicable to control centre and terminal equipments distance very far, or inconvenience adoption wired correspondence lie quality etc. situation, for example the oil well information collect behind of deliver, the long range copy form system, city transportation direction etc. all according to the TC35i mold piece to realization.2 The application of GSM network:GSM is Global System for Mobile Communications acronym, which means Global System for Mobile Communications is the world's leading cellular systems inthe world. GSM is based on narrowband TDMA standard that allows radio frequency in a group call at the same time 8. GSM80 during the rise in Europe, put into use in 1991. The end of 1997, has operations in more than 100 countries, Europe and Asia has become the standard in fact, that by 2001, the world's 162 countries have already built a 400 GSM communications network. But the GSM system capacity is limited, users in the network overload, it had to construct additional network facilities. What is gratifying is that GSM performance in other areas, which in addition to providing a standardized list and signaling systems, but also opened up some of the more intelligent of the business such as international roaming and so on. The convenience of GSM mobile phone is that it provides a smart card, known as SIM cards, and card could be separated, so that the replacement of mobile phone users and custom personal information in this area are facilitated.GSM network to improve after years of development, is now very mature, less blind spots, signal stability, automatic roaming, and the communication distance from the impact of the surrounding environment. GSM short message in particular, flexible and convenient, you can cross-market, inter-provincial and even cross-border transmission, and each send a short message as long as one dime, very reliable and affordable. In addition, the mobile phone SIM card in recent years can apply for 0, some packages use lower cost than fixed. Therefore the use of mobile phone message to achieve alarm, ultra long-range remote control for industrial equipment, transmission of data is a very good choice.GSM module, is a similar mobile communication module, integrates a number of mobile phone functions on a single small circuit board, it can send SMS messages, calls and so on, the module is small, but it has a lot of mobile phone functionality, with its have equal is the core of the mobile phone, and it is in a lot of applications have a wide range of applications, GSM module through the use of AT commands to control it, modules can be connected to computer RS232 serial port, can also be used to carry out single-chip control . Below we cite some typical applications:2.1 mobile phone access control system:GSM Access Control System used to control the electric lock control, if you need to enter, as long as the cell phone call using GSM modules mobile number, will automatically open the door, and only you can set up cell phone numbers to open the door, and no costs.2.2 three billboard over the weather disaster emergency turn off:Over three billboards are constantly flip through the motor to achieve a number of ads displayed, because installed in the outdoors, when there is wind, hail and other weather disasters, billboards could easily be blown bad or damaged card die, when in need of emergency shut down, You can normally closed relay contact to control the power of advertising, when you need to do is send "turn off" control message, the billboard will automatically turn off, and automatically after a certain time delay automatically return to normal job (generally disastrous weather will not continue for a long time) in advance if you want to open a billboard, you can send "Open" control message.2.3 engineering system balance reminders:Some works are safe after the completion of the normal operation after a period of time to settle the balance, if the encounter malicious clients the outstanding purchase price, often installed side very headache, because equipment has been installed, if the loss of a great come back down, particularly in the field customer very costly when the client system can be installed in the GSM module, use it all the way to control system or the way some of the key points, when the customer paid in arrears when the malicious message can turn off some features, forcing customers to pay the purchase price then immediately open message, if you have a smooth recovery of the purchase price can also be the name of system maintenance by the GSM module removed from the client system.2.4 monitoring systems or Web servers and reset the alarm:Monitoring system or web server running after a long period after death may be wrong, this time to power on reset is the only solution at this time through the GSM module can control system power, and set to open automatically after 3 seconds turn off mode, can achieve power reduction, in addition, GSM module in some special application areas also played a very large role, such as: the disappearance of the main power supply, memory errors, fan shutdown, fuel depletion, it was the invasion and other information, are not people the ideal choice for monitoring the engine room.2.5 the remote control of home appliances:Through the message can easily achieve the remote control to open rice cookers, water heaters and other appliances by remote control or switch to repair mode can also control the air-conditioning GSM global wireless mobile communication network control alarm host, using the global GSM short message data transmission mode and voice-enabled platform for the completion of intelligent data transmission and remotecontrol alarm, set the host family, shops, office safety, electrical control, remote monitoring, such as Intelligent home functions, because of the global GSM wireless mobile communication network signal coverage area of Canton, and truly realize the low-cost high-quality ultra-long-distance convenient and flexible intelligent wireless control and alarm, to solve the fixed-line telephone or cable broadband network wired alarm limitations. GSM global wireless mobile communications network in popularity all over the world, the GSM global wireless mobile communication network control alarm can be widely used in a single host family, community property, electricity, transportation, petroleum, coal, railway, municipal and public security departments of the security industry prevention devices, data monitoring and remote monitoring system. Wireless Road, with 11 defense areas, 2-way Cable Standoff, different defense area alarm, alarm and message control, separate from a defended position, remote control, home appliance control, linkage to take photographs with the latest alarm center network characteristics.Features:1. Wireless suspects under strict surveillance, no wiring, and ease of installation.2. Cable suspects under strict surveillance, safe and reliable.3. Wireless remote control security / from a defended position, easy to operate.4. Adaptability widely used global-band wireless mobile networks.5. Password settings, confidentiality stronger.6. Alarm, the high-decibel alarm sound to deter thieves.7. Host automatically to six groups of mobile numbers to send SMS alerts. Alarm message and a telephone can be set up8. Host automatically dial the six groups of mobile or fixed telephone warning, start-site monitoring.9. Preset scene alarm and alarm message10. With emergency alarm function, can prevent thieves burglary, detection of gas leaks and smoke fire.11. Communicate electric missing Detect and alarm, to prevent the intentional destruction of the power system and power failure monitoring.12. Communicate after the loss of electricity automatically switch to a back-up battery. 13. Available through GSM network platform and networking alarm center.14. Supported message in Chinese or English instructions.15. Handset intercom mode: Matching intercom calls, and alarm can be two-wayintercom, real-time clear police intelligence to prevent unnecessary alarm.3 The TC35i mold piece introductionCurrently, domestic already beginning usage of the GSM mold piece have a lot, and these of function, method of using difference not big.What this design adoption is a Siemens TC35 the TC35i of the series.On this kind of wireless mold piece function and TC35 and permit, design tightly packed, consumedly contracted the physical volume of customer's product.The TC35i and GSM2/2 and permit,dual-band(GSM900/GSM1800), RS232 the data connect, should mold piece and radio frequency electric circuit and Ji take and integral whole, provide toward the customer standard of AT order connect, is data, speech, short news and fax provide fast, credibility, safety of deliver, convenience customer of application development and design.3.1 The GSM AT instruction introduction that the mold has something to do with SMS in the piec e:The order for provide of the GSM- powered mold piece match GSM07.05 and GSM07.07 norm.In the GSM07.07 definition of the AT Command connect and provided a kind of which GSM AT Instruction TC35i AT89C51move terrace and data terminal equipments of in general use connect;The GSM07.05 made to the short news detailed of provision.At short news mold piece receive network hair of short news, can send out a designation information through a string of, the data terminal equipments can send out toward the GSM mold piece various order.The instruction of GSM AT having something to do with SMS such as List1 to show.The instruction of GSM AT gather, is signed letter, Motorola and HP etc. factory house by Nokia, love to together develop for the GSM system of, among them include control SMS(Short Message Service).3.2 The PDU code rule:Send out short news in common use Text and PDU(Protocol Data Unit, agreement data unit) mode currently.The usage Text mode receive and dispatch a message code simple, realization get up very easy, but the biggest weakness be to can't receive and dispatch Chinese message;But PDU mode not only support Chinese message, also the ability send out English message.The PDU mode receive and dispatch a message can the usage be 3 kinds of to code:7-bit, 8-bit and UCS2 code.7-the bit code to used for send out common of ASCII character list, 8-bitcode Be usually used for sending out data news, UCS2 code used for sending out Unicode character list.General PDU's code is constitute by ABCDEFGHIJKLM 13.A:The address length of the message center, 216 enter to make number(one word stanza)B:The number type of the message center, 216 enter to make number.C:Message center number, B+C length will from the data decisionD:Document head word stanza, 216 enter to make number.E:Information type, 216 enter to make number.F:Drive call number length, 216 enter to make number.G:Drive call number type, 216 enter to make number, take value togetherH:Drive call number, length from data within F decision.I:Agreement marking, 216 enter to make number.J:The data code a project, 216 enter to make number.K:Term of validity, 216 enter to make number. L:Customer data length, 216 enter to make number.M:Customer's data, its length from the data decision in the L.Enactment in J adoption UCS2 code, here is the Unicode character list of Chinese-English.4 the hardware of the TC35i and list slice machine connect a people'selectric circuitThe TC35i mold piece is main to save according to the processor, GSM radio frequency mold piece, power supply mold piece, Shan from the GSM, the ZIF conjunction machine, antenna connect six part constitute.Connect machine with a list slice machine realization electric circuit to connect through a ZIF, should connect read or send out the TC35i mold piece in of data.5 list slice the software of the machine and TC35i connect and controlprinciple8051 one-chip computer have four 8 walk abreast I/O port, call P0, P1, P2 and P3. Each port is 8 accurate two-way mouths, accounts for 32 pins altogether. Every one I/O line can be used as introduction and exported independently. Each port includes a latch (namely special function register ), one exports the driver and a introduction buffer . Make data can latch when outputting, data can buffer when making introduction , but four function of passway these self-same. Expand among the system of memory outside having slice, four port these may serve as accurate two-way mouth of I/O in common use. Expand among the system of memory outsidehaving slice, P2 mouth see high 8 address off; P0 mouth is a two-way bus, send the introduction of 8 low addresses and data / export in timesharingList slice the software of the machine and TC35i connect in fact be list slice the machine pass AT instruction control cellular phone of control technique, first constitution the TC35i mold piece of work mode:AT+CMGF=n, n=0 is a PDU mode;N=1 write an article this mode;Usually the constitution is a PDU mode, under this kind of mode, ability transmission or accept a transparent data.(customer from definition data)AT+CMGR=n in order to read the short news data of the TC35i mold piece, the n is a short news number.AT+CMGL=n in order to list the short news in the TC35i mold piece, n=0 is the short news which read, n=a the short news which have been already read, n=2 short news which sent out, n=3 for have already send out of short news n=4 is all short news.AT+CMGD=the n is the short news which delete the TC35i mold piece and the n is a short news serial number.6 Master routineThe software plait distance pass to write in toward the TC35i dissimilarity of AT instruction ability completion variety function, such as network debarkation, read SIM card top telephone number, send out SMS news and receive SMS news etc..The instruction sign, constant, PDU data...etc. of AT instruction all code form transmission by ASCII;The transmission transparent data have to pair of the TC35i mold piece of work mode constitution is PDU mode;List slice machine toward the TC35i mold piece after send out each instruction have to with return to car sign conduct and actions should instruction of be over, for example list slice the machine send out instruction in"AT+ CMGF=0" toward the cellular phone, its ASCII code sequence is"41 H, 54 H, 2 BH, 42 H, 4 DH, 47 H, 46 H, 3 DH, 30 H, 0 DH", the last word stanza 0 DH is to return to car sign, mean that instruction be over, if have no this to return to car sign, the cellular phone won't identify this instruction.When the AT instruction which receive to an integrity of the TC35i mold piece after, the TC35i mold piece not summary execution should instruction, but first just receive of the ASCII of the AT instruction code sequence all anti- send out;(contain 0 DH)Secondly send out a the ASCII which return to car sign with a carriage return sign to code, namely 0 DH with 0 AH;Then performance should instruction.The list slice machine read the PDU data of the TC35i mold piece, originality data should is 16 enter make number, but read back of data still is an ASCII mean of 16 enter make number.So a word stanza of 16 entered to make number and thenbecame 2 word stanza of ASMII code.But the PDU data data word stanza length within pack part still is actual character list length.But isn't the word stanza which become ASCII code length, this at plait distance should special attention, otherwise receive of data not integrity.The list slice machine is after receiving a PDU data pack data have to its instauration become 16 enter make a data, its calculate way as follows:Establish a for the ASCII code receive, b for the conversion is behind of 16 enter make number.So if a<39 H,b=a-30 H;If a>39 H, b=h-07 H a-30.End pair of in front and back two pieces merger is a word stanza.Concluding remark The usage cellular phone mold piece benefit is at the system integration, the cost be lower.Install correspondence circuit in secluded region etc. difficulty or uneconomical place, engineering service facilities can freedom vivid of constitution, no longer be subjected to geography condition of restriction.In fine, GSM mold piece the price be cheap, application extensive, application the foreground be captivating, pass with cellular phone mold the piece connect can very convenience of design customer demand of the data receive terminal.基于 GSM 模块与 AT89C51 的接口设计及应用的接口设计及应用-----摘自《GSM 原理及其网络优化》第一章-----摘自《新型单片机接口器件与技术》第六章摘要本文通过分析 GSM 模块与单片机的接口设计简单介绍了 TC35i 模块的常用指令及摘编码规则,着重介绍了 TC35i 模块与 AT89C51 的工作原理、外围接口电路、软件控制技术,同时给出了一些 TC35i 模块与 AT89C51 接口的应用程序,提出了 AT89C51 在接收数据时应该注意的问题,从而设计出具有 GSM 模块的数据传输终端。

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译文学院:土建学院专业:土木工程学号:064&&&&&&&姓名:&&&&&&指导教师: &&&&&&教授江苏科技大学2010年 03 月 28 日均布荷载作用下挡土墙上的土压力G. I. Shvetsov UDC 624.131.531.2在前一篇文章中,我们确定了在只考虑填土自重的试验条件下,作用在挡土墙上的压力。

这篇文章是第一篇文章的延续,致力于探索填土在外界均布荷载作用下,在挡土墙上产生的荷载问题,当在使用到先前得到的岩土平衡微分方程时,我们仅仅只改变边界条件,因为在这种情况下我们使用了与初始解决方案相同的原理。

我们只提取那些与附加土压力有关的新成果,以及仅定义那些第一次出现的新符号。

在设计中,我们通常把作用在挡土墙上的土压力看作是呈三角形分布的,应力也被假设为是沿着墙体均匀连续分布的,但是实验结果并没有证实这一理论,试验表明表面的附加应力随墙的高度变化并不均匀,而是从回填土顶部的最大值开始一直减小到其底部的最小值。

因而,在M.C.瓦尔跟实验图的纵坐标的最大值超出理论计算值近两倍,最小值达到理论计算值的0.65倍,因为土压力的增加主要是在墙的上部,由此所得出的作用点比计算所得出的要高很多。

F.M.shikhiev 的理论里包含了关于挡土墙均布荷载作用下的二维应力折减问题,但是, 附加应力的分布对挡土墙受超荷载作用的效果问题的影响,并没有经过合适的理论研究。

虽然,不同研究人员所做的无数次试验已经确定,侧壁的扭曲效应更大,随着表面的粗糙程度而变大,随挡土墙的宽度和高度之比。

在这篇文章里,我们将尽可能的填补这方面的空白。

在边界条件0q 0,y x ==的基础上,我们可以确定试验中作用在有侧向限制的填土上没有超荷的垂直应力。

如果一个外附加应力作用在楔块表面上的强度为x σ,则在这种情况下,我们可以从已知条件得出,当y=0时,x q = x σ,既可以得出方程()()111/2/kx x w w h y h A q f m h A λσξ+-=+ (1)其中 ,荷载分配的不均匀系数A 1和土的深度有关:()()111/1/kkA y h y h -=--- (2)方程一是通用的,因为对于任意一种荷载分布x σ它都可以计算出任意土层中某一点的应力,因此便足以表明应力在X 轴方向的分布规律。

当0=x σ时,方程便简化成相应的没有附加应力的形式,并且,当0=w f 而且0>x σ时,它反映了在考虑了附加应力条件时的二维问题,即:11kx x hy q A h γσ⎛⎫=+- ⎪⎝⎭(3)满布在滑动楔上的均布荷载对我们已经知道的设计系数k ,n,和ξw 的值并没有影响,所以,计算作用在挡土墙上的正应力,切应力和总应力的表达式如下:0;;ox x ox ox ox nq f tot στσσ==⋅=(4)作用在实验环节中的侧墙的应力由以下的方程解得:3hx w x hx w kxhx q f tot σξτσ==⋅= (5)而回填土上静态部分产生的应力这样计算:sx s ox sx sxsx f tot σμστσσ=== (6)这里,就静态回填土而言,s μ是荷载效应的系数:()01tan 1/tan s f f ωμθ-=- (7)在回填土表面作用一个均布荷载,荷载强度用下面这个方程来描述:0x o h σγ= (8)这个方程中,0γ是作用在滑动体水平表面的土壤容重,吨/立方米; ho 是水平面的土壤层厚度,米; 当0γ=常量时,x σ仅与回填土层厚度有关。

对于有水平力作用的土层背面有着垂直(w=0)且非常光滑(0f =0)的挡土墙,当0γ=r 时,墙上的应力是:()0ox n y h σγ=+ (9)并且根据直线理论知道其值随着深度增加递增(见图1)。

在任意点上,与没有超载的挡土墙的应力平衡,并且引入了恒量o nh γ,它取决于超载层厚度h0。

挡土墙(f ≠0)上的回填土的摩擦力定性地改变了应力曲线:作用在滑动体的超载表明应力沿墙高度的不一致性,并且随着深度递减,从滑动体表面的最大值减少到墙基底的零。

在没有外载时,最大值从它原始的位置上升到回填土的表面,0h 值的增长也是如此。

在数据表1中的图表Ⅱ,探讨了起源于墙基底的三角形应力;图表Ⅲ表达了分布在倾斜(w>0)和理想光滑(f=0)的挡土墙上的应力与高度成二次方比例。

通道边上的土壤的摩擦力反过来对应力分布特征进行了修正,对于处在限制空间条件下的垂直、理想光滑的挡土墙,它用方程式表达:图一挡土墙上正常土压力。

图中曲线组合的参数显示在下表中曲线编号h,米f0ω,天fmm,米1 0,1,2 0 0 0 ——2 0,3,7,10 0.6 0 0 ——3 0,1,2,3,4,5 0 27 0 ——4 0,2,4,5,8,10 0 0 0.6 15 0,3,6,10 0.6 0 0.6 1()()02/1oxw wn y hf m yγσξ+=+(10)第一项表示的是没有附加应力时的压力,而第二项表示的是压力随着墙高度的增高而增大是由附加应力引起的。

和组图一中有关二维问题(图一)不同的是,组图四中表示的是在0≠wf时附加应力非均匀的分布在竖直(0=w)和完全光滑(0=f)的挡土墙上。

压力增加的最大值仅在填土的表面取得,随着深度的增加,压力增量呈渐近线式递减。

挡土墙底部的压力在不断增长,但是增长很缓慢。

从图表五中可以看出,在有摩擦力作用于挡土墙时,压力会进行重新分布。

压力的增量从上部结构的最大值递减到底部结构的零。

和组图二的单一形式相比,压力线呈复杂的鞍形,这是大部分平面应力所具有的特征。

当所有其他条件相同时,压力线V 的曲率取决于挡土墙侧壁表面粗糙程度。

随着回填土对挡土墙侧壁摩擦力的不断减少,压力线图V 将会变直,从而对于二维问题在性质和数量上都比较接近于压力线II 。

随着挡土墙长度的增加在收敛的图表中也会发现类似的规律。

因此,当回填土水平表面受到一个均布荷载作用时挡土墙所受的压力会重新分布,而这会随着用来抵消附加压力对回填土底层的影响的摩擦力的作用效果的不同而不同。

实践当中应用的三角形压力线图也只在挡土墙是竖直并且完全光滑同时回填土墙是处于一种平面应力状态下这一特别有限的条件下才是正确的。

因为光滑的表面不能被建造,根据线性定律压力也就不能被分布。

在回填土不是处于其自然颗粒状态而是处于固化的楔形的假设的基础上,再根据Coulomb 的理论才能得出真正的挡土墙三角形应力线图。

从而这导致保留面的平均摩擦力人为平均化。

事实上,颗粒材料的摩擦力是不一致分布的,反而随着从回填土表面起深度的增加而增加。

这种情况导致结构高度上负荷非线性分布的特征。

我们从理论上得到的为了真实条件的压力线图和模拟挡土墙在有限尺寸实验渠道中获得的实验数据非常一致。

为确定垂直压力Qx 在颗粒材料中的作用,起积分关系表示如下:hx x Q q dy =⎰很容易得到下式方程:()()22/21xx w w h Q f m k γμξ=++ (11)Ux 系由于超负荷回填土压力增加系数21xx hσμγ=+(12) 在缺乏超负荷qx=0和系数ux=1,将方程(4)中Qx 替换为qx,我们可以发现正常情况造成的压力的表达,摩擦力,和在超负荷存在条件下传递到挡土墙的总压力:0ox x ox oxox P nQ F f P R === (13)作用于渠道侧墙的resultang 负载的组分可表示为:hx w x hx w hxhx P Q F f P R ξ===(14)和材料静止部分的压力:;;sx s ox sx sx sx F f R ρμρρ=== (15)方程11,13,14和15给出了每单位长度挡土墙的负荷连续均匀分布的荷载并不依赖坐标轴X 并和所有可能滑动面保持一致,因此,挡土墙上危险压力无论在有超负荷还是没有超负荷的情况下都将对应于同样的表面滑动。

我们将会从墙底部开始确定压力中心位置,如果压力线图的静力矩(相对于采取基地)除整个线图的面积,我们会得到方程:()()2132xox h k K z k +=+ (16) Kx 系数考虑了超负荷对压力中心位置的影响:()()()1122/21xx x w w K h k f m h k σγσξ=+⎡⎤++⎢⎥++⎣⎦(17)但Dx>0,系数Kx>1,超负荷提高了压力中心的位置,这个从图1也可以看出。

而在没有超负荷情况下,压力中心在墙高一半处,在有超负荷情况下,压力中心可以到达在墙的上半部分。

参考文献1.M.N.Vargin ,“均布荷载对挡土墙的影响” ,Osnovaniya, Fundamenty i Mekhan. Gruntov, No. 3 (1968).2.R.V. Lubenov,“作用在土体中的力,形成的作用在垂直挡土墙上的土压力绕上轴分布”,OUZ M/VlF SSSR, Nauchnye Trudy, Gidrotekhnika, No. III~ Transport, Moscow (1964).3.R.V. Lubenov and P. I. Yakovlev, "直立墙的平行移动对土中推力和压力大小的影响" ,OUZ MMF SSSR, Nauchnye Trudy, Gidrotekhnika, No. III, Transport, Moscow4.G.I. Shvetsov ,“挡土墙上土体在三向受压时的土压力,Gidro-tekh. Stroitel”, No. 10 (1971).5.F.M. Shikhiev,“土压力沿墙体高度上的应力分布”,Cktesskii hast. Inzhenerov Morskogo Flora, Nauchnye Trudy, Yubileinyi Vypusk (1955).。

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