毕业设计外文资料翻译译文

毕业设计外文资料翻译译文
毕业设计外文资料翻译译文

附件1:外文资料翻译译文

包装对食品发展的影响

一个消费者对某个产品的第一印象来说包装是至关重要的,包括沟通的可取性,可接受性,健康饮食形象等。食品能够提供广泛的产品和包装组合,传达自己加工的形象感知给消费者,例如新鲜包装/准备,冷藏,冷冻,超高温无菌,消毒(灭菌),烘干产品。

食物的最重要的质量属性之一,是它的味道,其影响人类的感官知觉,即味觉和嗅觉。味道可以很大程度作退化的处理和/或扩展存储。其他质量属性,也可能受到影响,包括颜色,质地和营养成分。食品质量不仅取决于原材料,添加剂,加工和包装的方法,而且其预期的货架寿命(保质期)过程中遇到的分布和储存条件的质量。越来越多的竞争当中,食品生产商,零售商和供应商;和质量审核供应商有显着提高食品质量以及急剧增加包装食品的选择。这些改进也得益于严格的冷藏链中的温度控制和越来越挑剔的消费者。

保质期的一个定义是:在食品加工和包装组合下,在食品的容器和条件,在销售点分布在特定系统的时间能保持令人满意的食味品质。保质期,可以用来作为一个新鲜的概念,促进营销的工具。延期或保质期长的产品,还提供产品的使用时间,方便以及减少浪费食物的风险,消费者和/或零售商。包装产品的质量和保质期的主题是在第3章中详细讨论。

包装为消费者提供有关产品的重要信息,在许多情况下,使用的包装和/或产品,包括事实信息如重量,体积,配料,制造商的细节,营养价值,烹饪和开放的指示,除了法律准则的最小尺寸的文字和数字,有定义的各类产品。消费者寻求更详细的产品信息,同时,许多标签已经成为多语种。标签的可读性是为视障人士的问题,这很可能成为一个对越来越多的老年人口越来越重要的问题。

食物的选择和包装创新的一个主要驱动力是为了方便消费者的需求。这里有许多方便的现代包装所提供的属性,这些措施包括易于接入和开放,处置和处理,产品的知名度,再密封性能,微波加热性,延长保质期等。在英国和其他发达经济体显示出生率下降和快速增长的一个相对富裕的老人人口趋势,伴随着更加苛

刻的年轻消费者,他们将要求和期望改进包装的功能,如方便包揭开(百货配送研究所,IGD)。

对零售商而言存在有一个高的成本,供应和服务的货架体系。没有储备足够的产品品种或及时补充库存,特别是副食品,如鲜牛奶,可能导致客户不满和流失到竞争对手的商店,这正需要保证产品供应。现代化的配送和包装系统,允许消费者在购买食品时,他们希望在他们想任何时间地点都能享用。近几年消费者的选择已在急剧扩大。例如在英国,20世纪60年代和90年代之间在一般超市的产品线的数量从2000年左右上升到超过18000人(INCPEN)。

自20世纪70年代以来,食品卫生和安全问题已成为日益重要的关注和选择食物的驱动力。媒体所关注的一系列问题,如使用化学添加剂和食品污染事故已警示消费者,这些事件都是故意的,恶意篡改的,和在生产过程意外发生的。然而,许多消费者都没有充分认识到包装在维护食品安全和质量过程中的重要作用。明显更改之后的包装迅速推出,不仅为了保护消费者,而且为了品牌的一个效果,一直是许多预包装食品。另一个影响一直激励消费者注重保质保鲜、最小加工和对产品的原产地(OECD)的标准给予更多的关注。

消费者直接通过他们的购买方式和它们所产生的包装废弃物对环境的影响。消费者购买包装作为产品的一部分,包装的重量,多年来,所包含的产品,相对下降。然而,消费模式产生了更大容量的包装,由于人口结构的变化和生活方式的变化,这些情况使得包装体积,而不是包装的重量,正成为吸引公众关注的关键。此外,朝预包装食品和食品包装服务的发展趋势,增加了塑料包装废弃物进入固体废物流的金额。

零售商和制造商所使用的营销策略之一,是对环境的兼容性。然而,消费者往往混淆或发现它很难界定什么是对环境负责的或友好的包装。正是这种缺乏明确的含义,至今无法利用,以使零售商和包装公司获得竞争优势。消费者需要明确的信息来指导他们的行动,使大多数的人差异化。包装链的各部门负责解释的职能和自身包装的好处,厂家销售好的包装,他们的客户,产品的厂家,但这一特定的信息到达最终顾客相对较少。

包装在现代快速消费品零售上的发展,反过来成了促使以满足其需求的演变的关键。最重要的发展为食品包装行业已出现大型零售集团。这些群体产生巨大

的影响和控制生产什么,如何介绍产品和它们是如何分配商店的。大型零售商处理的包装食品杂货市场的主要份额对食品生产厂家相关的包装供应商施加相当大的影响。因此,重要的包装供应商充分了解市场需求和快速响应变化。此外,买方力量集中在零售层面是指制造商可能需要修改它们的分布和包装业务反应的结构变化的零售。

论包装多种食品零售环境可考虑其在品牌竞争和零售物流中的作用。在食品销售流通中一个重要的关键,一个品牌的成功,或仅仅是生存在一个高度竞争的市场,包装起着至关重要的作用。包装设计创新存在于一线之间的竞争品牌的主要零售商和产品制造商,已在近年来推动巨大的零售增长,行业激烈的竞争和日益苛刻和复杂的消费者。在个人品牌/产品的基础上,成功取决于产品制造商的快速创新的反应的主要趋势。一个最有效的回应方式是通过独特的包装,这已经成为一个品牌成功关键因素。零售商自有品牌产品与制造商的品牌在几乎每一个产品类别竞争激烈。品牌差异化可以提高创新的包装设计,赋予审美和/或功能属性。

包装在预测零售商的形象,赢得竞争优势方面起着重要的支撑作用。一般零售商自己的品牌形象的目的是积极的消息,如高品质的,健康的饮食,新鲜,环保意识还是物有所值的整体。例如,零售商是热衷于环保意识,推动部分为可生物降解、可堆肥包装成长的利基市场,他们正在使用它作为与客户的沟通点。

包装与广告是密切相关的,但它远远超过了广告,重点是因为它每天在家里和在零售货架上向消费者介绍产品。商品显示,目前用一个有吸引力的或有趣的方式和媒体广告与包装的形象一致的包装设计也有利于促进品牌。品牌的拥有者是经常负责采购操作,促销活动的关键是通过利用有效的包装,存在多种返还优惠的方式,如免费额外的产品,退返现金,特别版,新的改进产品,铝箔新鲜包装。

零售商的忠诚卡计划使用条码扫描信息购买和销售决策,对其产生了很大的影响。他们的任务是更好地利用这一信息消费行为为目的,并建立品牌忠诚度。零售商还可以使用此信息来评估新的包装设计有效性,返还促销和新产品销售。

包装的作用在多个零售物流配送和店内商品有严格的限制。零售商是接受包装,降低经营成本,增加存货周转率,转化为吸引力商品显示器 - 如预组装或

易于装配显示 - 满足物流服务水平(可靠性,响应速度和产品的可用性)。例如,联合运输销售点包装节省商店劳动力通过更快货架载荷,从而避免需要使用有潜在危险的不安全的切割工具,提供方便的机会,并减少了污染源的可能。

总经销成本影响,通过对价格的影响(麦金农,1989)的需求总量。对于一些快速移动商品型产品,如巴氏杀菌奶,分销及零售商品成本产品总成本占高达50%或更多的销售价格通常是一个相当大的比例。包装材料和容器还增加了成本而设计出最佳包装系统可以大大降低在零售连锁配送的成本。发展全球食品供应链意味着,许多生产点位置远离消费点,往往导致配送成本较高。

通过改善供应链运作效率,进行分销成本控制是一个零售商竞争优势关键。零售商必须最大限度地发挥在分销渠道(西,1989年)的运作效率。分配目标是以最少的成本为客户提供必要的服务水平,最具成本效益后勤包装标识变得更加重要。配送成本领域,包括仓储,库存,运输,管理包装;仓储,库存,运输和储存劳动是零售商的主要成本区而运输,仓储包装食品制造商主要成本区。

多种零售食品供应链效率依赖于零售商,食品生产商和包装供应商之间密切沟通。它还依赖于准确的订单预测可能的市场需求。信息技术大规模投资,使更紧密的供应链的整合,并通过电子数据交换(EDI),确保股票上刚刚在实时(JIT)的基础上移动商店,出售届满前条形码是一个代码,使全行业的零售产品单位鉴定通过一个独特的参考号码,主要应用在零售结帐电子销售系统(EPOS)。小学,中学和大专院校包装使用鉴定的条形码,使有效的分配管理和库存控制。

附件2:外文原文

FOOD PACKING TECHNOLOGY

Packaging is critical to a consumer’s first impression of a product, communi- cating desirability, acceptability, healthy eating image etc. Food is available in a wide range of product and pack combinations that convey their own processed image perception to the consumer e.g. freshly packed/prepared, chilled, frozen, ultra-heat treated (UHT) aseptic, in-can sterilised and dried products.

One of the most important quality attributes of food, affecting human sen- sory perception, is its flavour, i.e. taste and smell. Flavour can be significantly

degraded by processing and/or extended storage. Other quality attributes that may also be affected include colour, texture and nutritional content. The quality of a food depends not only on the quality of raw ingredients, additives, methods of processing and packaging, but also on distribution and storage conditions encountered during its expected shelf life. Increasing competition amongst food producers, retailers and packaging suppliers; and quality audits of suppliers have resulted in significant improvements in food quality as well as a dramatic increase in the choice of packaged food. These improvements have also been aided by tighter temperature control in the cold chain and a more discerning consumer.

One definition of shelf life is: the time during which a combination of food processing and packaging can maintain satisfactory eating quality under the particular system by which the food is distributed in the containers and the conditions at the point of sale. Shelf life can be used as a marketing tool for promoting the concept of freshness. Extended or long shelf life products also provide the consumer and/or retailer with the time convenience of pro duct use as well as a reduced risk of food wastage. The subject of Packaged product q u a l i t y a n d s h e l f l i f e i s d i s c u s s e d i n d e t a i l i n C h a p t e r 3.

Packaging provides the consumer with important information about the product and, in many cases, use of the pack and/or product. These include facts such as weight,volu me, ingred ients,the manufac turer’s details, nutritional value, cooking and opening instructions. In addition to legal guidelines on the minimum size of lettering and numbers, there are definitions for the various types of product. Consumers are seeking more detailed nformation about products and, at the same time, many labels have become multilingual. Legibility of labels is an issue for the visually impaired and this is likely to become more important with an increasingly elderly population..

A major driver of food choice and packaging innovation is the consumer demand for convenience. There are many convenience attributes offered by modern packaging. These include ease of access and opening, dispos al and handling, product visibility, resealability, microwaveability, prolonged shelf

life etc. Demographic trends in the age profile of the UK and other advanced economies reveal a declining birth rate and rapid growth of a relatively afflu- ent elderly population. They, along with a more demanding young consumer, will require and expect improved pack functionality, such as ease of pack o p e n i n g(T h e I n s t i t u t e o f G r o c e r y D i s t r i b u t i o n,I G D).

There is a high cost to supplying and servicing the retailer’s shel f. Failure to stock a sufficient variety of product or replenish stock in time, especially for staple foods such as fresh milk, can lead to customer dissatisfaction and defection to a competitor’s store, where product availability is assured. Mod- ern distribution and packaging systems allow consumers to buy food when and where they want them. Consumer choice has expanded dramatically in recent years. In the UK, for example, between the 1960s and 1990s the number of product lines in the average supermarket rose from around 2000 to over 18 000. . Since the 1970s, food health and safety have become increasingly major concerns and drivers of food choices. Media attention has alerted consumers to a range of issues such as the use of chemical additives and food contamination incidents. These incidents have been both deliberate, by malicious tampering, and accidental, occurring during the production process. However, many consumers are not fully aware of the importance of packaging in maintaining food safety and quality. One effect has been the rapid introduction of tamper evident closures for many pre-packaged foods in order to not only protect the consumer but also the brand. Another impact has been to motivate consumers to give more attention to the criteria of freshness/shelf life, minimum processing and the products oringin..

Consumers ha ve dire ct environ mental imp act through the wa y the y purchase and the packaging waste they generate. Consumers purchase packaging as part of the product and, over the years, the weight of packaging has declined relative to that of the product contained. However, consumption patterns have generated larger volumes of packaging due to changing demo- graphics and lifestyles. It is the volume of packaging rather than the weight

of packaging that is attracting critical public attention. In addition, the trend toward increased pre-packaged foods and food service packaging has increased the amount of plastics packaging waste entering the solid waste stream. Packaging has been a key to the evolution of modern fast-moving consu goods retailing that in turn has spurred on packaging developments to meet its requirements. The most significant development for the food packaging supply industries has been the emergence of large retail groups. These groups exert enormous influence and control over what is produced, how products are pre- sented and how they are distributed to stores. The large retailers handle a major share of the packaged grocery market and exert considerable influence on food manufacturers and associated packaging suppliers. It is, therefore, import ant for packaging suppliers to be fully aware of market demand and respond quickly to changes. In addition, the concentration of buyer power at the retail level means that manufacturers may have to modify their distribution and p a c k a g i n g o p e r a t io n s i n r e s p o n s e to s t r u c t u r a l c h a n g e s i n r e ta i l i n g.

Packaging for fast-moving consumer goods (f.m.c.g.) has been referred to as part of the food retail marketing mix and thus closely affects all th e other marketing variables i.e. product, price, promotion, and place (Nickels & Jolsen,

The discussion on packaging in the multiple food retail environment may be considered in terms of its role in brand competition and retail logistics. The role of packaging in brand competition.Packaging plays a vital role in

food marketing representing a significant key to a brand’s success or mere sur- vival in a highly competitive marketplace. Packaging innovation and design are in the front line of competition between the brands of both major retailers and product manufacturers, having been driven in recent years by dramatic retail growth, intense industry competition and an increasingly demanding and sophisticated consumer. On an individual product/brand bas is, success is dependent on the product manufacturer’s rapid innovative response to major trends. One of the most effective ways to respond is through distinctive pack-

aging, and this has become one key factor in the success of a brand. The retail- ers’ own brand products compete intensely with manufacturers’ brands in virtually every product category. Brand differentiation can be enhanced by drive the growing n i c h e m a r k e t f o r b i o d e g r a d a b l e a n d c o m p o s t a b l e p a c k a g i n g. The y a re us ing it as a poin t of co mmuni cation with th eir cus to me rs.

Packaging is closely linked to advertising but it is far more focused than advertising because it presents the product to the consumer daily in the home and on the retail shelf. Merchandising displays that present the pack desi gn in an attractive or interesting way and media advertising consistent with the pack’s image also serve to promote the brand. The brand owner is frequently responsible for the merchandising operation. A key to promotional activities is through effective use of packaging and there exist many kinds of on-pack promotions such as free extra product, money-off, special edition, new improved Bar code scanning information linked to the use of retailers’ loyalty card schemes has made a big impact on buying and marketing decision-making by retailers. Their task is to make better use of this information on con- sumer behaviour for promotional purposes and to build store brand loyalty. Retailers can also use this information to evaluate the effectiveness of new pack designs, on-pack promotions and the sales appeal of new products. The role of packaging in multiple retail logistics.There are tight constraints

on physical distribution and in-store merchandising. The retailer is receptive to packaging that reduces operating costs, increases inventory turnover, trans- forms to attractive merchandising displays –such as pre-assembled or easy- to-assemble aisle displays –and satisfies logistics service levels (reliability, responsiveness and product availability). For example, combined transit and point-of-sale packaging saves store labour through faster shelf loading, pro- vides ease of access to product thereby obviating the need to use potentially dangerous unsafe cutting t ools, and presents an opportunity for source reduce.

The total distribution cost affects the total volume of demand through its

influence on price (McKinnon, 1989). For some fast-moving commodity type products, such as pasteurised milk, the cost of distrib ution and retail mer- chandising is usually a sizeable proportion of total product cost representing up to 50 per cent or more of the sales price. The cost of packaging materials and containers also adds slightly to the cost but design of the optimal packaging system can significantly reduce cost in the retail distribution chain. The development of global food supply chains has meant that many points of production have located further away from the points of consump- t i o n,o f t e n r e s u l t i n g i n h i g h e r d i s t r i b u t i o n c o s t.

Controlling distribution cost through improved operational efficiency in the supply chain is a key to competitive advantage for a retailer. The retailer must maximise operational efficiency in the distribution channel (West, 1989). The goal of distribution is to deliver the requisite level of service to customers at the least cost. The identification of the most cost-effective logistical packaging is becoming more crucial. Cost areas in distribution include storage, inventory, transport, administration and packaging. Storage, inventory, transport and store labour are major cost areas for the retailer while transport, storage and p a c k a g i n g a r e t h e m a i n c o s t a r e a s f o r t h e f o o d m a n u f a c t u r e r.

The efficiency of the multiple retail food supply chain relies on close com- munication between retailers, food manufacturers and packaging suppliers. It also relies on accurate order forecasting of likely demand. Massive investment in information technology has enabled closer integration of the supply chain and, through electronic data interchange (EDI), has ensured that stock moves to stores on a just-in-time (JIT) basis, and is sold well before the expiry date. The bar code is a code that allows the industry-wide identification of retail product units by means of a unique reference number, the major application being the electronic point of sale (EPoS) system at the retail checkout. The use of the bar code for identification of primary, secondary and tertiary packaging h a s e n a b l e d e f f i c i e n t d i s t r i b u t i o n m a n a g e m e n t a n d s t o c k c o n t r o l.

毕业设计外文翻译资料

外文出处: 《Exploiting Software How to Break Code》By Greg Hoglund, Gary McGraw Publisher : Addison Wesley Pub Date : February 17, 2004 ISBN : 0-201-78695-8 译文标题: JDBC接口技术 译文: JDBC是一种可用于执行SQL语句的JavaAPI(ApplicationProgrammingInterface应用程序设计接口)。它由一些Java语言编写的类和界面组成。JDBC为数据库应用开发人员、数据库前台工具开发人员提供了一种标准的应用程序设计接口,使开发人员可以用纯Java语言编写完整的数据库应用程序。 一、ODBC到JDBC的发展历程 说到JDBC,很容易让人联想到另一个十分熟悉的字眼“ODBC”。它们之间有没有联系呢?如果有,那么它们之间又是怎样的关系呢? ODBC是OpenDatabaseConnectivity的英文简写。它是一种用来在相关或不相关的数据库管理系统(DBMS)中存取数据的,用C语言实现的,标准应用程序数据接口。通过ODBCAPI,应用程序可以存取保存在多种不同数据库管理系统(DBMS)中的数据,而不论每个DBMS使用了何种数据存储格式和编程接口。 1.ODBC的结构模型 ODBC的结构包括四个主要部分:应用程序接口、驱动器管理器、数据库驱动器和数据源。应用程序接口:屏蔽不同的ODBC数据库驱动器之间函数调用的差别,为用户提供统一的SQL编程接口。 驱动器管理器:为应用程序装载数据库驱动器。 数据库驱动器:实现ODBC的函数调用,提供对特定数据源的SQL请求。如果需要,数据库驱动器将修改应用程序的请求,使得请求符合相关的DBMS所支持的文法。 数据源:由用户想要存取的数据以及与它相关的操作系统、DBMS和用于访问DBMS的网络平台组成。 虽然ODBC驱动器管理器的主要目的是加载数据库驱动器,以便ODBC函数调用,但是数据库驱动器本身也执行ODBC函数调用,并与数据库相互配合。因此当应用系统发出调用与数据源进行连接时,数据库驱动器能管理通信协议。当建立起与数据源的连接时,数据库驱动器便能处理应用系统向DBMS发出的请求,对分析或发自数据源的设计进行必要的翻译,并将结果返回给应用系统。 2.JDBC的诞生 自从Java语言于1995年5月正式公布以来,Java风靡全球。出现大量的用java语言编写的程序,其中也包括数据库应用程序。由于没有一个Java语言的API,编程人员不得不在Java程序中加入C语言的ODBC函数调用。这就使很多Java的优秀特性无法充分发挥,比如平台无关性、面向对象特性等。随着越来越多的编程人员对Java语言的日益喜爱,越来越多的公司在Java程序开发上投入的精力日益增加,对java语言接口的访问数据库的API 的要求越来越强烈。也由于ODBC的有其不足之处,比如它并不容易使用,没有面向对象的特性等等,SUN公司决定开发一Java语言为接口的数据库应用程序开发接口。在JDK1.x 版本中,JDBC只是一个可选部件,到了JDK1.1公布时,SQL类包(也就是JDBCAPI)

软件开发概念和设计方法大学毕业论文外文文献翻译及原文

毕业设计(论文)外文文献翻译 文献、资料中文题目:软件开发概念和设计方法文献、资料英文题目: 文献、资料来源: 文献、资料发表(出版)日期: 院(部): 专业: 班级: 姓名: 学号: 指导教师: 翻译日期: 2017.02.14

外文资料原文 Software Development Concepts and Design Methodologies During the 1960s, ma inframes and higher level programming languages were applied to man y problems including human resource s yste ms,reservation s yste ms, and manufacturing s yste ms. Computers and software were seen as the cure all for man y bu siness issues were some times applied blindly. S yste ms sometimes failed to solve the problem for which the y were designed for man y reasons including: ?Inability to sufficiently understand complex problems ?Not sufficiently taking into account end-u ser needs, the organizational environ ment, and performance tradeoffs ?Inability to accurately estimate development time and operational costs ?Lack of framework for consistent and regular customer communications At this time, the concept of structured programming, top-down design, stepwise refinement,and modularity e merged. Structured programming is still the most dominant approach to software engineering and is still evo lving. These failures led to the concept of "software engineering" based upon the idea that an engineering-like discipl ine could be applied to software design and develop ment. Software design is a process where the software designer applies techniques and principles to produce a conceptual model that de scribes and defines a solution to a problem. In the beginning, this des ign process has not been well structured and the model does not alwa ys accurately represent the problem of software development. However,design methodologies have been evolving to accommo date changes in technolog y coupled with our increased understanding of development processes. Whereas early desig n methods addressed specific aspects of the

外文翻译

Load and Ultimate Moment of Prestressed Concrete Action Under Overload-Cracking Load It has been shown that a variation in the external load acting on a prestressed beam results in a change in the location of the pressure line for beams in the elastic range.This is a fundamental principle of prestressed construction.In a normal prestressed beam,this shift in the location of the pressure line continues at a relatively uniform rate,as the external load is increased,to the point where cracks develop in the tension fiber.After the cracking load has been exceeded,the rate of movement in the pressure line decreases as additional load is applied,and a significant increase in the stress in the prestressing tendon and the resultant concrete force begins to take place.This change in the action of the internal moment continues until all movement of the pressure line ceases.The moment caused by loads that are applied thereafter is offset entirely by a corresponding and proportional change in the internal forces,just as in reinforced-concrete construction.This fact,that the load in the elastic range and the plastic range is carried by actions that are fundamentally different,is very significant and renders strength computations essential for all designs in order to ensure that adequate safety factors exist.This is true even though the stresses in the elastic range may conform to a recognized elastic design criterion. It should be noted that the load deflection curve is close to a straight line up to the cracking load and that the curve becomes progressively more curved as the load is increased above the cracking load.The curvature of the load-deflection curve for loads over the cracking load is due to the change in the basic internal resisting moment action that counteracts the applied loads,as described above,as well as to plastic strains that begin to take place in the steel and the concrete when stressed to high levels. In some structures it may be essential that the flexural members remain crack free even under significant overloads.This may be due to the structures’being exposed to exceptionally corrosive atmospheres during their useful life.In designing prestressed members to be used in special structures of this type,it may be necessary to compute the load that causes cracking of the tensile flange,in order to ensure that adequate safety against cracking is provided by the design.The computation of the moment that will cause cracking is also necessary to ensure compliance with some design criteria. Many tests have demonstrated that the load-deflection curves of prestressed beams are approximately linear up to and slightly in excess of the load that causes the first cracks in the tensile flange.(The linearity is a function of the rate at which the load is applied.)For this reason,normal elastic-design relationships can be used in computing the cracking load by simply determining the load that results in a net tensile stress in the tensile flange(prestress minus the effects of the applied loads)that is equal to the tensile strength of the concrete.It is customary to assume that the flexural tensile strength of the concrete is equal to the modulus of rupture of the

毕业设计外文翻译附原文

外文翻译 专业机械设计制造及其自动化学生姓名刘链柱 班级机制111 学号1110101102 指导教师葛友华

外文资料名称: Design and performance evaluation of vacuum cleaners using cyclone technology 外文资料出处:Korean J. Chem. Eng., 23(6), (用外文写) 925-930 (2006) 附件: 1.外文资料翻译译文 2.外文原文

应用旋风技术真空吸尘器的设计和性能介绍 吉尔泰金,洪城铱昌,宰瑾李, 刘链柱译 摘要:旋风型分离器技术用于真空吸尘器 - 轴向进流旋风和切向进气道流旋风有效地收集粉尘和降低压力降已被实验研究。优化设计等因素作为集尘效率,压降,并切成尺寸被粒度对应于分级收集的50%的效率进行了研究。颗粒切成大小降低入口面积,体直径,减小涡取景器直径的旋风。切向入口的双流量气旋具有良好的性能考虑的350毫米汞柱的低压降和为1.5μm的质量中位直径在1米3的流量的截止尺寸。一使用切向入口的双流量旋风吸尘器示出了势是一种有效的方法,用于收集在家庭中产生的粉尘。 摘要及关键词:吸尘器; 粉尘; 旋风分离器 引言 我们这个时代的很大一部分都花在了房子,工作场所,或其他建筑,因此,室内空间应该是既舒适情绪和卫生。但室内空气中含有超过室外空气因气密性的二次污染物,毒物,食品气味。这是通过使用产生在建筑中的新材料和设备。真空吸尘器为代表的家电去除有害物质从地板到地毯所用的商用真空吸尘器房子由纸过滤,预过滤器和排气过滤器通过洁净的空气排放到大气中。虽然真空吸尘器是方便在使用中,吸入压力下降说唱空转成比例地清洗的时间,以及纸过滤器也应定期更换,由于压力下降,气味和细菌通过纸过滤器内的残留粉尘。 图1示出了大气气溶胶的粒度分布通常是双峰形,在粗颗粒(>2.0微米)模式为主要的外部来源,如风吹尘,海盐喷雾,火山,从工厂直接排放和车辆废气排放,以及那些在细颗粒模式包括燃烧或光化学反应。表1显示模式,典型的大气航空的直径和质量浓度溶胶被许多研究者测量。精细模式在0.18?0.36 在5.7到25微米尺寸范围微米尺寸范围。质量浓度为2?205微克,可直接在大气气溶胶和 3.85至36.3μg/m3柴油气溶胶。

本科毕业设计方案外文翻译范本

I / 11 本科毕业设计外文翻译 <2018届) 论文题目基于WEB 的J2EE 的信息系统的方法研究 作者姓名[单击此处输入姓名] 指导教师[单击此处输入姓名] 学科(专业 > 所在学院计算机科学与技术学院 提交日期[时间 ]

基于WEB的J2EE的信息系统的方法研究 摘要:本文介绍基于工程的Java开发框架背后的概念,并介绍它如何用于IT 工程开发。因为有许多相同设计和开发工作在不同的方式下重复,而且并不总是符合最佳实践,所以许多开发框架建立了。我们已经定义了共同关注的问题和应用模式,代表有效解决办法的工具。开发框架提供:<1)从用户界面到数据集成的应用程序开发堆栈;<2)一个架构,基本环境及他们的相关技术,这些技术用来使用其他一些框架。架构定义了一个开发方法,其目的是协助客户开发工程。 关键词:J2EE 框架WEB开发 一、引言 软件工具包用来进行复杂的空间动态系统的非线性分析越来越多地使用基于Web的网络平台,以实现他们的用户界面,科学分析,分布仿真结果和科学家之间的信息交流。对于许多应用系统基于Web访问的非线性分析模拟软件成为一个重要组成部分。网络硬件和软件方面的密集技术变革[1]提供了比过去更多的自由选择机会[2]。因此,WEB平台的合理选择和发展对整个地区的非线性分析及其众多的应用程序具有越来越重要的意义。现阶段的WEB发展的特点是出现了大量的开源框架。框架将Web开发提到一个更高的水平,使基本功能的重复使用成为可能和从而提高了开发的生产力。 在某些情况下,开源框架没有提供常见问题的一个解决方案。出于这个原因,开发在开源框架的基础上建立自己的工程发展框架。本文旨在描述是一个基于Java的框架,该框架利用了开源框架并有助于开发基于Web的应用。通过分析现有的开源框架,本文提出了新的架构,基本环境及他们用来提高和利用其他一些框架的相关技术。架构定义了自己开发方法,其目的是协助客户开发和事例工程。 应用程序设计应该关注在工程中的重复利用。即使有独特的功能要求,也

毕业设计外文翻译原文.

Optimum blank design of an automobile sub-frame Jong-Yop Kim a ,Naksoo Kim a,*,Man-Sung Huh b a Department of Mechanical Engineering,Sogang University,Shinsu-dong 1,Mapo-ku,Seoul 121-742,South Korea b Hwa-shin Corporation,Young-chun,Kyung-buk,770-140,South Korea Received 17July 1998 Abstract A roll-back method is proposed to predict the optimum initial blank shape in the sheet metal forming process.The method takes the difference between the ?nal deformed shape and the target contour shape into account.Based on the method,a computer program composed of a blank design module,an FE-analysis program and a mesh generation module is developed.The roll-back method is applied to the drawing of a square cup with the ˉange of uniform size around its periphery,to con?rm its validity.Good agreement is recognized between the numerical results and the published results for initial blank shape and thickness strain distribution.The optimum blank shapes for two parts of an automobile sub-frame are designed.Both the thickness distribution and the level of punch load are improved with the designed blank.Also,the method is applied to design the weld line in a tailor-welded blank.It is concluded that the roll-back method is an effective and convenient method for an optimum blank shape design.#2000Elsevier Science S.A.All rights reserved. Keywords:Blank design;Sheet metal forming;Finite element method;Roll-back method

引进外资外文翻译资料

河南科技学院新科学院 2013届本科毕业生论文(设计) 英文文献及翻译 Foreign capital inflows and welfare in an economy with imperfect competition 学生姓名:王艳杰 所在院系:经济系 所学专业:国际经济与贸易 导师姓名:侯黎杰 完成时间:2013年4月15日

Foreign capital inflows and welfare in an economy with imperfect competition Abstract:This paper examines the resource allocational and welfare effects of exogenous inflows of foreign capital in a general-equilibrium model with oligopolistic competition and unemployment. Although the welfare impact for the short run is ambiguous and dependent upon the strength of excess profits and scale economies relative to unemployment in manufacturing, in the long run additional inflows of foreign capital always improve national welfare with capital mobility. Hence, attracting foreign capital remains a sound policy for economies characterized by imperfect competition, scale economies,and regional unemployment. Keywords: International capital mobility; Imperfect competition; Welfare 1.Introduction The welfare effects of exogenous inflows of foreign capital in the presence of trade restrictions have been extensively studied. Brecher and Diaz Alejandro (1977) show that when imports are subject to tariffs, an introduction of fo reign capital inflows accentuates the tariff distortion and hence reduces national welfare if the import-competing sector is relatively capital-intensive. In contrast, Dei (1985) shows that when imports are restricted by quotas,foreign capital inflows in the presence of foreign-owned capital always improve welfare by depressing the rental and so lowering the payments to existing foreign-owned capital. Recently, Neary (1981), using a common framework for both tariffs and quotas, obtains more general results of foreign capital inflows; the welfare effect of such inflows depends crucially on whether foreign-owned capital exists initially in the home country. In addition, Khan (1982) and Grinols (1991) have examined the effects of foreign capital inflows for a generalized Harris-Todaro economy under tariff protection. Khan finds that the result by Brecher and Diaz Alejandro is still valid even in the presence of unemployment, whereas Grinols argues that increased foreign capital need not be detrimental to welfare if the opportunity costs of labor are sufficiently low. Noteworthy is that the models used by these authors are all based upon the premise of perfect competition along with constant returns-to-scale technology. Although perfect competition serves as a useful assumption in crystallizing theoretical insights, it nevertheless fails to depict many of the real-world phenomena. The real-world economy is characterized, to a large extent, by imperfect competition and economies of scale. The policy implications of imperfect competition and economies

毕业设计外文翻译

毕业设计(论文) 外文翻译 题目西安市水源工程中的 水电站设计 专业水利水电工程 班级 学生 指导教师 2016年

研究钢弧形闸门的动态稳定性 牛志国 河海大学水利水电工程学院,中国南京,邮编210098 nzg_197901@https://www.360docs.net/doc/189110180.html,,niuzhiguo@https://www.360docs.net/doc/189110180.html, 李同春 河海大学水利水电工程学院,中国南京,邮编210098 ltchhu@https://www.360docs.net/doc/189110180.html, 摘要 由于钢弧形闸门的结构特征和弹力,调查对参数共振的弧形闸门的臂一直是研究领域的热点话题弧形弧形闸门的动力稳定性。在这个论文中,简化空间框架作为分析模型,根据弹性体薄壁结构的扰动方程和梁单元模型和薄壁结构的梁单元模型,动态不稳定区域的弧形闸门可以通过有限元的方法,应用有限元的方法计算动态不稳定性的主要区域的弧形弧形闸门工作。此外,结合物理和数值模型,对识别新方法的参数共振钢弧形闸门提出了调查,本文不仅是重要的改进弧形闸门的参数振动的计算方法,但也为进一步研究弧形弧形闸门结构的动态稳定性打下了坚实的基础。 简介 低举升力,没有门槽,好流型,和操作方便等优点,使钢弧形闸门已经广泛应用于水工建筑物。弧形闸门的结构特点是液压完全作用于弧形闸门,通过门叶和主大梁,所以弧形闸门臂是主要的组件确保弧形闸门安全操作。如果周期性轴向载荷作用于手臂,手臂的不稳定是在一定条件下可能发生。调查指出:在弧形闸门的20次事故中,除了极特殊的破坏情况下,弧形闸门的破坏的原因是弧形闸门臂的不稳定;此外,明显的动态作用下发生破坏。例如:张山闸,位于中国的江苏省,包括36个弧形闸门。当一个弧形闸门打开放水时,门被破坏了,而其他弧形闸门则关闭,受到静态静水压力仍然是一样的,很明显,一个动态的加载是造成的弧形闸门破坏一个主要因素。因此弧形闸门臂的动态不稳定是造成弧形闸门(特别是低水头的弧形闸门)破坏的主要原是毫无疑问。

本科毕业设计外文翻译

Section 3 Design philosophy, design method and earth pressures 3.1 Design philosophy 3.1.1 General The design of earth retaining structures requires consideration of the interaction between the ground and the structure. It requires the performance of two sets of calculations: 1)a set of equilibrium calculations to determine the overall proportions and the geometry of the structure necessary to achieve equilibrium under the relevant earth pressures and forces; 2)structural design calculations to determine the size and properties of thestructural sections necessary to resist the bending moments and shear forces determined from the equilibrium calculations. Both sets of calculations are carried out for specific design situations (see 3.2.2) in accordance with the principles of limit state design. The selected design situations should be sufficiently Severe and varied so as to encompass all reasonable conditions which can be foreseen during the period of construction and the life of the retaining wall. 3.1.2 Limit state design This code of practice adopts the philosophy of limit state design. This philosophy does not impose upon the designer any special requirements as to the manner in which the safety and stability of the retaining wall may be achieved, whether by overall factors of safety, or partial factors of safety, or by other measures. Limit states (see 1.3.13) are classified into: a) ultimate limit states (see 3.1.3); b) serviceability limit states (see 3.1.4). Typical ultimate limit states are depicted in figure 3. Rupture states which are reached before collapse occurs are, for simplicity, also classified and

毕业设计外文翻译原文

编号: 毕业设计(论文)外文翻译 (原文) 院(系):应用科技学院 专业:机械设计制造及其自动化 学生姓名:邓瑜 学号:0501120501 指导教师单位:应用科技学院 姓名:黄小能 职称: 2009年 5 月20 日

The Injection Molding The Introduction of Molds The mold is at the core of a plastic manufacturing process because its cavity gives a part its shape. This makes the mold at least as critical-and many cases more so-for the quality of the end product as, for example, the plasticiting unit or other components of the processing equipment. Mold Material Depending on the processing parameters for the various processing methods as well as the length of the production run, the number of finished products to be produced, molds for plastics processing must satisfy a great variety of requirements. It is therefore not surprising that molds can be made from a very broad spectrum of materials, including-from a technical standpoint-such exotic materials as paper matched and plaster. However, because most processes require high pressures, often combined with high temperatures, metals still represent by far the most important material group, with steel being the predominant metal. It is interesting in this regard that, in many cases, the selection of the mold material is not only a question of material properties and an optimum price-to-performance ratio but also that the methods used to produce the mold, and thus the entire design, can be influenced. A typical example can be seen in the choice between cast metal molds, with their very different cooling systems, compared to machined molds. In addition, the production technique can also have an effect; for instance, it is often reported that, for the sake of simplicity, a prototype mold is frequently machined from solid stock with the aid of the latest technology such as computer-aided (CAD) and computer-integrated manufacturing (CIM). In contrast to the previously used methods based on the use of patterns, the use of CAD and CAM often represents the more economical solution today, not only because this production capability is available pin-house but also because with any other technique an order would have to be placed with an outside supplier. Overall, although high-grade materials are often used, as a rule standard materials are used in mold making. New, state-of-the art (high-performance) materials, such as ceramics, for instance, are almost completely absent. This may be related to the fact that their desirable characteristics, such as constant properties up to very high temperatures, are not required on molds, whereas their negative characteristics, e. g. low tensile strength and poor thermal conductivity, have a clearly related to ceramics, such as sintered material, is found in mild making only to a limited degree. This refers less to the modern materials and components

毕业设计外文资料翻译译文

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