搜档网
当前位置:搜档网 › 科技文献中英文翻译

科技文献中英文翻译

科技文献中英文翻译
科技文献中英文翻译

Intelligent Power Supply

英文

With the rapid development of electronic technology, application field of electronic system is more and more extensive, electronic equipment, there are more and more people work with electronic equipment, life is increasingly close relationship. Any electronic equipment are inseparable from reliable power supply for power requirements, they more and more is also high. Electronic equipment miniaturized and low cost in the power of light and thin,small and efficient for development direction. The traditional transistors series adjustment manostat is continuous control linear manostat. This traditional manostat technology more mature, and there has been a large number of integrated linear manostat module, has the stable performance is good, output ripple voltage small, reliable operation, etc. But usually need are bulky and heavy industrial frequency transformer and bulk and weight are big filter.

In the 1950s, NASA to miniaturization, light weight as the goal, for a rocket carrying the switch power development. In almost half a century of development process, switch power because of is small volume, light weight, high efficiency, wide range, voltage advantages in electric, control, computer, and many other areas of electronic equipment has been widely used. In the 1980s, a computer is made up of all of switch power supply, the first complete computer power generation. Throughout the 1990s, switching power supply in electronics,electrical equipment, into the rapid development. In addition, large scale integrated circuit technology, and the rapid development of switch power supply with a qualitative leap, raised high frequency power products of, miniaturization, modular tide.

Power switch tube, PWM controller and high-frequency transformer is an indispensable part of the switch power supply. The traditional switch power supply is normally made by using high frequency power switch tube division and the pins, such as using PWM integrated controller UC3842 + MOSFET is domestic small power switch power supply, the design method of a more popularity.

Since the 1970s, emerged in many function complete integrated control circuit, switch power supply circuit increasingly simplified, working frequency enhances

unceasingly, improving efficiency, and for power miniaturization provides the broad prospect. Three end off-line pulse width modulation monolithic integrated circuit TOP (Three switch Line) will Terminal Off with power switch MOSFET PWM controller one package together, has become the mainstream of switch power lC development. Adopt TOP switch lC design switch power, can make the circuit

simplified,volume further narrowing, cost also is decreased obviousiy.

Monolithic switching power supply has the monolithic integrated, the minimalist peripheral circuit, best performance index, no work frequency transformer can constitute a significant advantage switching power supply, etc. American Pl (with) company in Power in the mid 1990s first launched the new high frequency switching Power supply chip, known as the "top switch Power", with low cost, simple circuit, higher efficiency. The first generation of products launched in 1994 represented TOP100/200 series, the second generation product is the TOPSwitch - debuted in 1997 П .The above products once appeared showed strong vitality and he greatly simplifies the design of 150W following switching power supply and the development of new products for the new job, also, high efficiency and low cost switch power supply promotion and popularization created good condition, which can be widely used in instrumentation, notebook computers, mobile phones, TV, VCD and DVD, perturbation VCR, mobile phone battery chargers, power amplifier and other fields, and form various miniaturization, density, on price can compete with the linear manostat AC/DC power transformation module.

Switching power supply to integrated direction of future development will be the main trend, power density will more and more big, to process requirements will increasingly high. In semiconductor devices and magnetic materials, no new breakthrough technology progress before major might find it hard to achieve, technology innovation will focus on how to improve the efficiency and focus on reducing weight. Therefore, craft level will be in the position of power supply manufacturing higher in. In addition, the application of digital control IC is the future direction of the development of a switch power. This trust in DSP for speed and anti-interference technology unceasing enhancement. As for advanced control method, now the individual feels haven't seen practicability of the method appears particularly strong, perhaps with the popularity of digital control, and there are some new control theory into switching power supply.

(1) The technology: with high frequency switching frequencies increase, switch

converter volume also decrease,power density has also been boosted, dynamic response improved. Small power DC - DC converter switch frequency will rise to MHz. But as the switch frequency unceasing enhancement, switch components and passive components loss increases, high-frequency parasitic parameters and high-frequency EMI and so on the new issues will also be caused.

(2) Soft switching technologies: in order to improve the efficiency of non-linearity of various soft switch, commutation technical application and hygiene, representative of soft switch technology is passive and active soft switch technology, mainly including zero voltage switch/zero current switch (ZVS/ZCS) resonance, quasi resonant, zero voltage/zero current pulse width modulation technology (ZVS/ZCS - PWM) and zero voltage transition/zero current transition pulse width modulation (PWM) ZVT/ZCT - technical, etc. By means of soft switch technology can effectively reduce switch loss and switch stress, help converter transformation efficiency.

(3) Power factor correction technology (IC simplifies PFC). At present mainly divided into IC simplifies PFC technology passive and active IC simplifies PFC technology using IC simplifies PFC technology two kinds big, IG simplifies PFC technology can improve AC - DC change device input power factor, reduce the harmonic pollution of power grid.

(4) Modular technology. Modular technology can meet the needs of the distributed power system, enhance the system reliability.

(5) Low output voltage technology. With the continuous development of semiconductor manufacturing technology, microprocessor and portable electronic devices work more and more low, this requires future DC - DG converter can provide low output voltage to adapt microprocessor and power supply requirement of portable electronic devices

People in switching power supply technical fields are edge developing related power electronics device, the side of frequency conversion technology, development of switch between mutual promotion push switch power supply with more than two year growth toward light, digital small, thin, low noise and high reliability, anti-interference direction. Switching power supply can be divided into the AC/DC and DC/DC two kinds big, also have AC/AC DC/AC as inverter DC/DC converter is now realize modular, and design technology and production process at home and abroad, are mature and standardization, and has approved by users, but the AC/DC modular, because of its own characteristics in the process of making modular, meet

more complex technology and craft manufacture problems. The following two types of switch power supply respectively on the structure and properties of this.

Switching power supply is the development direction of high frequency, high reliability, low consumption, low noise, anti-jamming and modular. Because light switch power, small, thin key techniques are changed, so high overseas each big switch power supply manufacturer are devoted to the development of new high intelligent synchronous rectifier, especially the improvement of secondary devices of the device, and power loss of Zn ferrite (Mn) material? By increasing scientific and technological innovation, to enhance in high frequency and larger magnetic flux density (Bs) can get high magnetic under the miniaturization of, and capacitor is a key technology. SMT technology application makes switching power supply has made considerable progress, both sides in the circuit board to ensure that decorate components of switch power supply light, small, thin. The high frequency switching power supply of the traditional PWM must innovate switch technology, to realize the ZCS ZVS, soft switch technology has become the mainstream of switch power supply technical, and greatly improve the efficiency of switch power. For high reliability index, America's switch power producers, reduce by lowering operating current measures such as junction temperature of the device, in order to reduce stress the reliability of products made greatly increased.

Modularity is of the general development of switch power supply trend can be modular power component distributed power system, can be designed to N + 1 redundant system, and realize the capacity expansion parallel. According to switch power running large noise this one defect, if separate the pursuit of high frequency noise will increase its with the partial resonance, and transform circuit technology, high frequency can be realized in theory and can reduce the noise, but part of the practical application of resonant conversion technology still have a technical problem, so in this area still need to carry out a lot of work, in order to make the technology to practional utilization.

Power electronic technology unceasing innovation, switch power supply industry has broad prospects for development. To speed up the development of switch power industry in China, we must walk speed of technological innovation road, combination with Chinese characteristics in the joint development path, for the high-speed development of national economy to make the contribution.

中文

智能开关电源

随着电子技术的高速发展,电子系统的应用领域越来越广泛,电子设备的种类也越来越多,电子设备与人们的工作、生活的关系口益密切。任何电子设备都离不开可靠的电源,它们对电源的要求也越来越高。电子设备的小型化和低成本化使电源以轻、薄、小和高效率为发展方向。传统的晶体管串联调整稳压电源是连续控制的线性稳压电源。这种传统稳压电源技术比较成熟,并且已有人量集成化的线性稳压电源模块,具有稳定性能好、输出波纹电压小、使用可靠等优点。但通常都需要体积人且笨重的工频变压器与体积和重量都很大的滤波器。

二十世纪五十年代,美国宇航局以小型化、重量轻为日标,为搭载火箭开发了开关电源。在近半个世纪的发展过程中,开关电源因具有重量轻、体积小、效率高、稳压范围宽等优点,在电子电气、控制、计算机等许多领域的电子设备中得到了广泛的使用。二十世纪八十年代,计算机全面实现了开关电源化,率先完成计算机的电源换代。二十世纪九十年代,开关电源在电子、电器设备、家电领域得到了广泛的应用,开关电源技术进入快速发展期。此外,人规模集成电路技术的迅速发展,又使开关电源有了质的飞跃,掀起了电源产品高频化、小型化、模块化的浪潮。

功率开关管、PWM控制器和高频变压器是开关电源必不可少的组成部分。传统的开关电源一般均采用分立的高频功率开关管和多引脚的PWM集成控制器,例如采用UC3842+MOSFET是国内小功率开关电源中较为普及的设计方法。

七十年代以米,涌现出许多功能完备的集成控制电路,使开关电源电路口益简化,工作频率不断提高,效率提高,并为电源小型化提供了广阔的前景。三端离线式脉宽调制单片开关集成电路TOP(Three Terminal Off Line)将PWM控制器,与功率开关MOSFET合二为一封装在一起,已成为开关电源IC发展的主流。采用TOP开关集成电路设计开关电源,可使电路简化,体积进一步缩小,成本也明显降低。

单片开关电源具有单片集成化、最简外围电路、最佳性能指标、能构成无工频变压器开关电源等显著优点。美国PI (Power Integration)公司于上世纪九十年代中期率先推出的新型高频开关电源芯片,被誉为“顶级开关电源”,具有成本低,电路简单,效率高等优点。其第一代产品以1994年推出的TOP100/200系列为代表,第二代产品则是1997年问世的TOP Switch-II。上述产品一经问

世便显示出强大的生命力,他极大地简化了150W以下开关电源的设计和新产品的开发工作,也为新型、高效、低成本开关电源的推广与普及创造了良好条件,可广泛用于仪器仪表、笔记本电脑、移动电话、电视机、VCD和DVD、摄录像机、手机电池充电器、功率放大器等领域,并构成各种小型化、高密度、在价格上能与线性稳压电源相竞争的AC/DC电源变换模块。

开关电源向集成化方向发展将是未来的主要趋势,功率密度将越来越大,对工艺的要求也会越米越高,在半导体器件和磁性材料没有新的突破之前,重大的技术进展可能很难实现,技术创新的重点将集中在如何提高效率和减小重量。因此,工艺水平将会在电源制造中占的地位越来越高。另外,数字控制集成电路的应用也是将来开关电源发展的一个方向.这信赖于DSP运行速度和抗干扰技术的不断提高.至于先进的控制方法,目前个人觉得还没有看到实用性特别强的方法出现,也许随着数字控制的普及,会有一些新的控制理论运用到开关电源中来。

(1)高频化技术:随着开关频率的提高,开关变换器的体积也随之减少,功率密度也得到大幅提升,动态响应得到改善。小功率DC-DC变换器的开关频率将上升到MHz。但随着开关频率的不断提高,开关元件和无源元件损耗的增加、高频寄生参数以及高频EMI等新的问题也将随之产生。

(2)软开关技术:为提高变换器的变换效率,各种软开关技术应用而生,具有代表性的是光源软开关技术和有源软开关技术,主要包括零电压开关/零电流开关(ZVS/ZCS)谐振、准谐振、零电抓/零电流脉宽调制技术(ZVS/ZCS-PWM)

以及零电压过渡/零电流过渡脉宽调制( ZVT/ZCT-PWM)技术等。采用软开关技术可以有效的降低开关损耗和开关应力,有助于变换器变换效率的提高。

(3)功率因数校正技术(PFC)。目前PFC技术主要分为有源PFC技术和无

源PFC技术曲大类,采用PFC技术可以提高AC-DC变化器输入端功率冈数,减少对电网的谐波污染。

(4)模块化技术。采用模块化技术可以满足分布式电源系统的需要,提高系统的可靠性。

(5)低输出电压技术。随着半导体制造技术的不断发展,微处理器和便携式电子设备的工作越来越低,这就要求未来的DC-DC变换器能够提供低输出电压以适应微处理器和便携式电子设备的供电要求。

人们在开关电源技术领域是边开发相关电力电子器件,边开发开关变频技术,两者相互促进推动着开关电源每年以超过两位数字的增长率向着轻、小、薄、低噪声、高可靠、抗干扰的方向发展。开关电源可分为AC/DC和DC/DC两大类,也有AC/AC DC/AC如逆变器DC/DC变换器现已实现模块化,且设计技术及生产工艺在国内外均已成熟和标准化,并已得到用户的认可,但AC/DC的模块化,冈其

自身的特性使得在模块化的进程中,遇到较为复杂的技术和工艺制造问题。以下分别对两类开关电源的结构和特性作以阐述。

开关电源的发展方向是高频、高可靠、低耗、低噪声、抗干扰和模块化。由于开关电源轻、小、薄的关键技术是高频化,因此同外各大开关电源制造商都致力于同步开发新型高智能化的元器件,特别是改善二次整流器件的损耗,并在功率铁氧体(VnZn)材料上加大科技创新,以提高在高频率和较大磁通密度(Bs)

下获得高的磁性能,而电容器的小型化也是一项关键技术。SMT技术的应用使得开关电源取得了长足的进展,在电路板两面布置元器件,以确保开关电源的轻、小、薄。开关电源的高频化就必然对传统的PWM开关技术进行创新,实现ZVS、ZCS的软开关技术已成为开关电源的主流技术,并大幅提高了开关电源的工作效率。对于高可靠性指标,美国的开关电源生产商通过降低运行电流,降低结温等措施以减少器件的应力,使得产品的可靠性大大提高。

模块化是开关电源发展的总体趋势,可以采用模块化电源组成分布式电源系统,可以设计成N+l冗余系统,并实现并联方式的容量扩展。针对.开关电源运行噪声大这一缺点,若单独追求高频化其噪声也必将随着增大,而采用部分谐振转换电路技术,在理论上即可实现高频化又可降低噪声,但部分谐振转换技术的实际应用仍存在着技术问题,故仍需在这一领域开展大量的工作,以使得该项技术得以实用化。

电力电子技术的不断创新,使开关电源产业有着广阔的发展前景。要加快我国开关电源产业的发展速度,就必须走技术创新之路,走出有中国特色的产学研联合发展之路,为我国民经济的高速发展做出贡献。

企业创新战略外文翻译文献

企业创新战略外文翻译文献(文档含中英文对照即英文原文和中文翻译) 翻译之一: Choosing an innovation strategy: theory and practice Author:Joseph T. Gilbert Nationality:America Derivation:Business Horizons, Nov-Dec, 1994 Innovations come as both inventions and adoptions. They come in many types and vary greatly in complexity and scope. Companies attempting to

make a profit cannot continue for long periods without innovating. If they try, their customers will leave them for firms with more up-to-date products or services. It is an observed fact that different companies take different approaches to the use of innovation in attempting to improve their performance. Both academic and practitioner publications in recent years have contained a great deal of writing about innovation, the subjects of which have ranged from comparisons of national patterns of innovation to studies of individual innovations. However, little has been published regarding one issue of both theoretical and practical importance: the innovation policy or strategy of individual firms. Business strategy as a field of study is concerned with how a company competes in its chosen business. It deals with the analysis of a firm's strengths and weaknesses and the opportunities and threats presented by the firm's environment. Strategy looks toward consistent execution of broad plans to achieve certain levels of performance. Innovation strategy determines to what degree and in what way a firm attempts to use innovation to execute its business strategy and improve its performance. To choose an innovation strategy, managers might logically start by thinking about various kinds of innovations and their requirements. We shall discuss three major features of innovation, and analyze each in terms of distinct opposites, even though innovations found in the real world more often appear at various points between these opposites. Innovation is sometimes used in a limited sense to refer only to inventions (products, services, or administrative procedures that no other firm has introduced). More often, however, it applies in a more general sense that includes both invention as described above and imitation (adoption by a firm of a product, service, or administrative procedure that is not an invention but is new to that firm). We use the term in this second sense. Innovations can be characterized in a variety of ways. In the following

文献翻译英文原文

https://www.sodocs.net/doc/677685569.html,/finance/company/consumer.html Consumer finance company The consumer finance division of the SG group of France has become highly active within India. They plan to offer finance for vehicles and two-wheelers to consumers, aiming to provide close to Rs. 400 billion in India in the next few years of its operations. The SG group is also dealing in stock broking, asset management, investment banking, private banking, information technology and business processing. SG group has ventured into the rapidly growing consumer credit market in India, and have plans to construct a headquarters at Kolkata. The AIG Group has been approved by the RBI to set up a non-banking finance company (NBFC). AIG seeks to introduce its consumer finance and asset management businesses in India. AIG Capital India plans to emphasize credit cards, mortgage financing, consumer durable financing and personal loans. Leading Indian and international concerns like the HSBC, Deutsche Bank, Goldman Sachs, Barclays and HDFC Bank are also waiting to be approved by the Reserve Bank of India to initiate similar operations. AIG is presently involved in insurance and financial services in more than one hundred countries. The affiliates of the AIG Group also provide retirement and asset management services all over the world. Many international companies have been looking at NBFC business because of the growing consumer finance market. Unlike foreign banks, there are no strictures on branch openings for the NBFCs. GE Consumer Finance is a section of General Electric. It is responsible for looking after the retail finance operations. GE Consumer Finance also governs the GE Capital Asia. Outside the United States, GE Consumer Finance performs its operations under the GE Money brand. GE Consumer Finance currently offers financial services in more than fifty countries. The company deals in credit cards, personal finance, mortgages and automobile solutions. It has a client base of more than 118 million customers throughout the world

英文文献及中文翻译

毕业设计说明书 英文文献及中文翻译 学院:专 2011年6月 电子与计算机科学技术软件工程

https://www.sodocs.net/doc/677685569.html, Overview https://www.sodocs.net/doc/677685569.html, is a unified Web development model that includes the services necessary for you to build enterprise-class Web applications with a minimum of https://www.sodocs.net/doc/677685569.html, is part of https://www.sodocs.net/doc/677685569.html, Framework,and when coding https://www.sodocs.net/doc/677685569.html, applications you have access to classes in https://www.sodocs.net/doc/677685569.html, Framework.You can code your applications in any language compatible with the common language runtime(CLR), including Microsoft Visual Basic and C#.These languages enable you to develop https://www.sodocs.net/doc/677685569.html, applications that benefit from the common language runtime,type safety, inheritance,and so on. If you want to try https://www.sodocs.net/doc/677685569.html,,you can install Visual Web Developer Express using the Microsoft Web Platform Installer,which is a free tool that makes it simple to download,install,and service components of the Microsoft Web Platform.These components include Visual Web Developer Express,Internet Information Services (IIS),SQL Server Express,and https://www.sodocs.net/doc/677685569.html, Framework.All of these are tools that you use to create https://www.sodocs.net/doc/677685569.html, Web applications.You can also use the Microsoft Web Platform Installer to install open-source https://www.sodocs.net/doc/677685569.html, and PHP Web applications. Visual Web Developer Visual Web Developer is a full-featured development environment for creating https://www.sodocs.net/doc/677685569.html, Web applications.Visual Web Developer provides an ideal environment in which to build Web sites and then publish them to a hosting https://www.sodocs.net/doc/677685569.html,ing the development tools in Visual Web Developer,you can develop https://www.sodocs.net/doc/677685569.html, Web pages on your own computer.Visual Web Developer includes a local Web server that provides all the features you need to test and debug https://www.sodocs.net/doc/677685569.html, Web pages,without requiring Internet Information Services(IIS)to be installed. Visual Web Developer provides an ideal environment in which to build Web sites and then publish them to a hosting https://www.sodocs.net/doc/677685569.html,ing the development tools in Visual Web Developer,you can develop https://www.sodocs.net/doc/677685569.html, Web pages on your own computer.

科技文本的翻译

(一)科技英语特点和翻译原则 科技文本:科学专着、科学论文、科学报道、试验报告、技术规范、工程技术说明、科技文献以及科普读物等。 科技文本的特点:用词非常严谨,行文规范,注重客观;描述平易,一般不带感情色彩;准确,正式,逻辑严密。 1. 科技英语的词汇。 i. 普通词汇 ii.半专业词汇 半专业词所表达的意义根据不同的学科内容而定 .:1. pencil 光学中:光纤锥,射束 机械中:metal pencil 焊条 2. concentration

1)Electrode potential depends on the concentration of the irons.(浓度) 2) A concentration process is important now that the depletion of high grade ores is possible. (富集) iii.专业词汇 i.词义专一,构成呈多样化,前后词缀,如:auto-, a-, semi-,micro-等。 ii.外来词多 2.科技英语中长句较多, 汉译英时注意拆分 科技英语重表示某些复杂概念时用的长复合句大大多于一般英 语。长句特点是从句和短语多,同时兼有并列结构或省略,倒装顺序,结构显得复杂。但其所表达的科技内容严密性、准确性和逻辑性较强。 见4. . 3.科技英语专业术语性强,汉译英是强调术语翻译的正确性。 专业术语语义具有严谨性和单一性 平时阅读与所译材料同类的英文材料 给概念以约定俗成的译名 .:药品的“保存期”是“shelf life”而不是“storage period” 肺活量是“vital capacity”而不是“lung capacity” 科技英语重缩略语情况也比较多,需勤查相关专业词典或参考书,采用公认的缩略形式。

营销策略外文翻译文献

营销策略外文翻译文献 (文档含中英文对照即英文原文和中文翻译)

译文: 营销策略 内容提要:为了组织的销售能是成功的,它需要根据一个营销策略计划来帮助保证其努力的目标和宗旨与市场的需要想吻合。营销策略审查市场以确定潜在顾客的需要,竞争者的战略和市场地位,并且尝试制定出一套能使组织在市场上获取或维护竞争优势的相关战略。有一些因素会对营销策略计划的发展造成冲击性的影响,它包括内部因素例如组织的财产、技能和组织文化,外在因素例如各种各样的市场驱动者、市场或产业运作方式、战略窗口和竞争的本质。一个优选的营销策略计划也需具备一套意外情况防备策略以应对市场治理及组织生产能力的不确定性。 关键词:竞争优势竞争策略市场地位市场份额营销销售计划组织文化营销策略 营销策略简述 无论组织的产品或服务多么好,除非它们的价值能被传达给潜在的顾客,否则组织依然无法实现它的使命。这种传达和交流是组织内市场营销功能的职责。根据美国市场协会,营销是“一个组织效能和一套创造过程、交流和传达产品价值给顾客、处理与顾客关系的有益于组织和它的利益共享者的方式”。营销作用包括相辅相成的两方面。营销策略在市场上审查市场来确定潜在顾客和竞争者本质的需要,并且试图开发

出在市场上将使组织获取或维护竞争优势的战略。操作的营销被建立在营销策略作用和贯彻各种各样的计划和策略(包括适当的混合营销的发展)吸引顾客和促进顾客忠实的基础之上的。 产品和服务营销的方法 有很多的方式能用来销售你的产品或服务包括做广告,直接响应、推销活动和宣传。然而,除非你能了解顾客、市场和产业的需要并且竞争的优势和劣势,否则这些方法是不太可能成功的。营销策略帮助一个组织尖化它的焦点和在市场顺利地竞争。营销策略与二个组分有关:目标市场和用最佳的方式传达你的产品价值或服务到那个市场。一个可实行的销售方针的发展取决于几个关键维度。首先,与组织之内的所有全球性战略一样,一个成功的销售方针需要由在组织之内的最高管理层签名。销售方针本质上也具有政治性的色彩:在组织之内的强有力的单位在最佳的销售方针也许不同意,并且协议也许需要谈判达成。销售方针也许受组织文化的也影响,并且那得假定这发生。例如,如果组织总是销售它的装饰物给商业主管,它也许就看不到组织之内的低层人员甚至是成人或少年的个人消费潜力。 实施战略销售计划发展的因素 存在一些能冲击战略销售计划发展的因素,这些因素首先包括组织已经拥有或它可能欣然获取的财产和技能。例如,如果组织拥有一个重大编程的部门,就为它能做和销售应用软件提供了可行性的条件。然而,如果这些人员已经在其他工作介入并且不能自由研究一个新的软件项目,并且组织没能力聘用另外的程序员,起始一条新的软件线是不妥当

中英文文献翻译

毕业设计(论文)外文参考文献及译文 英文题目Component-based Safety Computer of Railway Signal Interlocking System 中文题目模块化安全铁路信号计算机联锁系统 学院自动化与电气工程学院 专业自动控制 姓名葛彦宁 学号 200808746 指导教师贺清 2012年5月30日

Component-based Safety Computer of Railway Signal Interlocking System 1 Introduction Signal Interlocking System is the critical equipment which can guarantee traffic safety and enhance operational efficiency in railway transportation. For a long time, the core control computer adopts in interlocking system is the special customized high-grade safety computer, for example, the SIMIS of Siemens, the EI32 of Nippon Signal, and so on. Along with the rapid development of electronic technology, the customized safety computer is facing severe challenges, for instance, the high development costs, poor usability, weak expansibility and slow technology update. To overcome the flaws of the high-grade special customized computer, the U.S. Department of Defense has put forward the concept:we should adopt commercial standards to replace military norms and standards for meeting consumers’demand [1]. In the meantime, there are several explorations and practices about adopting open system architecture in avionics. The United Stated and Europe have do much research about utilizing cost-effective fault-tolerant computer to replace the dedicated computer in aerospace and other safety-critical fields. In recent years, it is gradually becoming a new trend that the utilization of standardized components in aerospace, industry, transportation and other safety-critical fields. 2 Railways signal interlocking system 2.1 Functions of signal interlocking system The basic function of signal interlocking system is to protect train safety by controlling signal equipments, such as switch points, signals and track units in a station, and it handles routes via a certain interlocking regulation. Since the birth of the railway transportation, signal interlocking system has gone through manual signal, mechanical signal, relay-based interlocking, and the modern computer-based Interlocking System. 2.2 Architecture of signal interlocking system Generally, the Interlocking System has a hierarchical structure. According to the function of equipments, the system can be divided to the function of equipments; the system

步进电机及单片机英文文献及翻译

外文文献: Knowledge of the stepper motor What is a stepper motor: Stepper motor is a kind of electrical pulses into angular displacement of the implementing agency. Popular little lesson: When the driver receives a step pulse signal, it will drive a stepper motor to set the direction of rotation at a fixed angle (and the step angle). You can control the number of pulses to control the angular displacement, so as to achieve accurate positioning purposes; the same time you can control the pulse frequency to control the motor rotation speed and acceleration, to achieve speed control purposes. What kinds of stepper motor sub-: In three stepper motors: permanent magnet (PM), reactive (VR) and hybrid (HB) permanent magnet stepper usually two-phase, torque, and smaller, step angle of 7.5 degrees or the general 15 degrees; reaction step is generally three-phase, can achieve high torque output, step angle of 1.5 degrees is generally, but the noise and vibration are large. 80 countries in Europe and America have been eliminated; hybrid stepper is a mix of permanent magnet and reactive advantages. It consists of two phases and the five-phase: two-phase step angle of 1.8 degrees while the general five-phase step angle of 0.72 degrees generally. The most widely used Stepper Motor. What is to keep the torque (HOLDING TORQUE) How much precision stepper motor? Whether the cumulative: The general accuracy of the stepper motor step angle of 3-5%, and not cumulative.

英文科技文献及翻译

外文翻译 DC GENENRATORS 1. INTRODUCTION For all practical purposes, the direct-current generator is only used for special applications and local dc power generation. This limitation is due to the commutator required to rectify the internal generated ac voltage, thereby making largescale dc power generators not feasible. Consequently, all electrical energy produced commercially is generated and distributed in the form of three-phase ac power. The use of solid state converters nowadays makes conversion to dc economical. However, the operating characteristics of dc generators are still important, because most concepts can be applied to all other machines. 2. FIELD WINDING CONNECTIONS The general arrangement of brushes and field winding for a four-pole machine is as shown in Fig.1. The four brushes ride on the commutator. The positive brusher are connected to terminal A1 while the negative brushes are connected to terminal A2 of the machine. As indicated in the sketch, the brushes are positioned approximately midway under the poles. They make contact with coils that have little or no EMF induced in them, since their sides are situated between poles. Figure 1 Sketch of four-pole dc matchine The four excitation or field poles are usually joined in series and their ends brought out to terminals marked F1 and F2. They are connected such that they produce north and south poles alternately. The type of dc generator is characterized by the manner in which the field

PLC论文中英文对照资料外文翻译文献

PLC论文中英文对照资料外文翻译文献 外文资料: PLC technique discussion and future development Along with the development of the ages, the technique that is nowadays is also gradually perfect, the competition plays more more strong; the operation that list depends the artificial has already can't satisfied with the current manufacturing industry foreground, also can't guarantee the request of the higher quantity and high new the image of the technique business enterprise. The people see in produce practice, automate brought the tremendous convenience and the product quantities for people up of assurance, also eased the personnel's labor strength, reduce the establishment on the personnel. The target control of the hard realization in many complicated production lines, whole and excellent turn, the best decision etc., well-trained operation work, technical personnel or expert, governor but can judge and operate easily, can acquire the satisfied result. The research target of the artificial intelligence makes use of the calculator exactly to carry out, imitate these intelligences behavior, moderating the work through person's brain and calculators, with the mode that person's machine combine, for resolve the very complicated problem to look for the best path We come in sight of the control that links after the electric appliances in various situation, that is already the that time generation past, now of after use in the mold a perhaps simple equipments of grass-roots control that the electric appliances can do for the low level only;And the PLC emergence also became the epoch-making topic, adding the vivid software control through a very and stable hardware, making the automation head for the new high tide. The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculationses of cost, as long as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the

战略管理参考文献

战略管理研究参考文献 (总目录) 项保华2003-5-31 重要说明:本目录经过多届博士生的共同努力,于2003年5月整理完成,主要提供本人指导的战略管理研究方向的博士生学习参考之用。可以认为,只要通读了本目录的大部分文献,必将能够对战略管理领域的当前及经典理论、方法有比较系统的把握。若能在此基础上潜心感悟,加强与同行的交流探索,定可具备解决具体战略理论与实践问题的创新思路与实用技能,从而顺利完成博士学位论文的选题与撰写。作为战略管理研究方向博士生培养的业务目标定位为,通过对战略理论与实践的系统学习,达到胜任国内重点高等院校战略领域的教学、研究、咨询工作之要求。所以,对于硕士生以及非战略管理研究方向的博士生而言,不作全面通读本目录文献之要求,各位可以根据自己的兴趣,从本目录中选取部分文献阅读,以作为参与战略课程学习之补充。 学习建议:以具体老师为师的范围终有限,而以文献为师则可延请古今中外名家赐教,广泛借鉴吸收多方面的见解。多读、多思、多写,书山无路勤为径,以学为乐恒则成!谨以此与各位共勉! 1、中文部分 为人经世 ?孔子, 论语(网上下载) ?老子, 道德经(网上下载) ?孙子, 孙子兵法(网上下载) ?马基雅维里(1469-1527), 君主论, 中国社会出版社, 1999 ?葛拉西安(1601-1658), 智慧书——永恒的处世经典(网上下载) ?何兆武, 西方哲学精神, 清华大学出版社, 2002 ?墨顿·亨特, 心理学的故事, 海南人民出版社, 1999 ?维克托·E.弗兰克尔, 人生的真谛, 中国对外翻译出版公司, 1994

? E. 迈尔, 生物学思想发展的历史, 四川教育人民出版社, 1990(网上下载) ?威尔逊, 新的综合:社会生物学(李昆峰编译), 四川人民出版社, 1985(网上下载) 战略总论 ?项保华, 战略管理——艺术与实务(第3版), 华夏出版社, 2003 ?明茨伯格等, 战略历程:纵览战略管理学派, 机械工业出版社, 2002 ?拜瑞·J·内勒巴夫;亚当·M·布兰登勃格, 合作竞争(Co-Opetition), 安徽人民出版社, 2000 ?迈克尔·波特, 竞争战略(原著1980年出版), 华夏出版社, 2003 ?迈克尔·波特, 竞争优势(原著1985年出版), 华夏出版社, 2003 ?迈克尔·波特, 国家竞争优势(原著1990年出版), 华夏出版社, 2002 ?迈克尔·波特等, 未来的战略, 四川人民出版社, 2000 ?格里·约翰逊;凯万·斯科尔斯, 公司战略教程, 华夏出版社, 1998 ?小乔治·斯托尔克等, 企业成长战略, 中国人民大学出版社、哈佛商学院出版社, 1999 专题探讨 ?保罗·索尔曼、托马斯·弗利德曼, 企业竞争战略, 中国友谊出版公司, 1985 ?罗伯特·艾克斯罗德, 对策中的制胜之道:合作的进化, 上海人民出版社, 1996 ?约瑟夫·巴达拉克, 界定时刻——两难境地的选择, 经济日报出版社、哈佛商学院出版社, 1998 ?芝加哥大学商学院、欧洲管理学院、密歇根大学商学院、牛津大学赛德商学院, 把握战略:MBA战略精要, 北京大学出版社, 2003 ?哈默尔、普拉哈拉德, 竞争大未来, 昆仑出版社, 1998 ?尼尔·瑞克曼, 合作竞争大未来, 经济管理出版社, 1998 ?卡尔·W.斯特恩、小乔治·斯托克, 公司战略透视, 上海远东出版社, 1999 ?乔尔·布利克、戴维·厄恩斯特, 协作型竞争, 中国大百科全书出版社, 1998

仪表板外文文献翻译、中英文翻译、外文翻译

Dashboard From Wikipedia, the free encyclopedia This article is about a control panel placed in the front of the car. For other uses, see Dashboard (disambiguation). The dashboard of a Bentley Continental GTC car A dashboard (also called dash, instrument panel (IP), or fascia) is a control panel located directly ahead of a vehicle's driver, displaying instrumentation and controls for the vehicle's operation. Contents 1.Etymology 2.Dashboard features 3.Padding and safety 4.Fashion in instrumentation 5.See also 6.References Etymology Horse-drawn carriage dashboard Originally, the word dashboard applied to a barrier of wood or leather fixed at the front of a horse-drawn carriage or sleigh to protect the driver from mud or other debris "dashed up" (thrown up) by the horses' hooves.[1] Commonly these boards did not perform any additional function other than providing a convenient handhold for ascending into the driver's seat, or a small clip with which to secure the reins when not in use. When the first "horseless carriages" were constructed in the late 19th century, with engines mounted beneath the driver such as the Daimler Stahlradwagen, the simple dashboard was retained to protect occupants from debris thrown up by the cars' front wheels. However, as car design evolved to position the motor in front of the driver, the dashboard became a panel that protected vehicle occupants from the heat and oil of the engine. With gradually increasing mechanical complexity, this panel formed a convenient location for the placement of gauges and minor controls, and from this evolved the modern instrument panel,

相关主题