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自动化太阳能发电系统英文文献翻译

自动化太阳能发电系统英文文献翻译
自动化太阳能发电系统英文文献翻译

《化学工程与工艺专业英语》课文翻译 完整版

Unit 1 Chemical Industry 化学工业 1.Origins of the Chemical Industry Although the use of chemicals dates back to the ancient civilizations, the evolution of what we know as the modern chemical industry started much more recently. It may be considered to have begun during the Industrial Revolution, about 1800, and developed to provide chemicals roe use by other industries. Examples are alkali for soapmaking, bleaching powder for cotton, and silica and sodium carbonate for glassmaking. It will be noted that these are all inorganic chemicals. The organic chemicals industry started in the 1860s with the exploitation of William Henry Perkin‘s discovery if the first synthetic dyestuff—mauve. At the start of the twentieth century the emphasis on research on the applied aspects of chemistry in Germany had paid off handsomely, and by 1914 had resulted in the German chemical industry having 75% of the world market in chemicals. This was based on the discovery of new dyestuffs plus the development of both the contact process for sulphuric acid and the Haber process for ammonia. The later required a major technological breakthrough that of being able to carry out chemical reactions under conditions of very high pressure for the first time. The experience gained with this was to stand Germany in good stead, particularly with the rapidly increased demand for nitrogen-based compounds (ammonium salts for fertilizers and nitric acid for explosives manufacture) with the outbreak of world warⅠin 1914. This initiated profound changes which continued during the inter-war years (1918-1939). 1.化学工业的起源 尽管化学品的使用可以追溯到古代文明时代,我们所谓的现代化学工业的发展却是非常近代(才开始的)。可以认为它起源于工业革命其间,大约在1800年,并发展成为为其它工业部门提供化学原料的产业。比如制肥皂所用的碱,棉布生产所用的漂白粉,玻璃制造业所用的硅及Na2CO3. 我们会注意到所有这些都是无机物。有机化学工业的开始是在十九世纪六十年代以William Henry Perkin 发现第一种合成染料—苯胺紫并加以开发利用为标志的。20世纪初,德国花费大量资金用于实用化学方面的重点研究,到1914年,德国的化学工业在世界化学产品市场上占有75%的份额。这要归因于新染料的发现以及硫酸的接触法生产和氨的哈伯生产工艺的发展。而后者需要较大的技术突破使得化学反应第一次可以在非常高的压力条件下进行。这方面所取得的成绩对德国很有帮助。特别是由于1914年第一次世界大仗的爆发,对以氮为基础的化合物的需求飞速增长。这种深刻的改变一直持续到战后(1918-1939)。 date bake to/from: 回溯到 dated: 过时的,陈旧的 stand sb. in good stead: 对。。。很有帮助

数据库外文参考文献及翻译.

数据库外文参考文献及翻译 数据库外文参考文献及翻译数据库管理系统——实施数据完整性一个数据库,只有用户对它特别有信心的时候。这就是为什么服务器必须实施数据完整性规则和商业政策的原因。执行SQL Server的数据完整性的数据库本身,保证了复杂的业务政策得以遵循,以及强制性数据元素之间的关系得到遵守。因为SQL Server的客户机/服务器体系结构允许你使用各种不同的前端应用程序去操纵和从服务器上呈现同样的数据,这把一切必要的完整性约束,安全权限,业务规则编码成每个应用,是非常繁琐的。如果企业的所有政策都在前端应用程序中被编码,那么各种应用程序都将随着每一次业务的政策的改变而改变。即使您试图把业务规则编码为每个客户端应用程序,其应用程序失常的危险性也将依然存在。大多数应用程序都是不能完全信任的,只有当服务器可以作为最后仲裁者,并且服务器不能为一个很差的书面或恶意程序去破坏其完整性而提供一个后门。SQL Server使用了先进的数据完整性功能,如存储过程,声明引用完整性(DRI),数据类型,限制,规则,默认和触发器来执行数据的完整性。所有这些功能在数据库里都有各自的用途;通过这些完整性功能的结合,可以实现您的数据库的灵活性和易于管理,而且还安全。声明数据完整性声明数据完整原文请找腾讯3249114六,维-论'文.网 https://www.wendangku.net/doc/4a12302028.html, 定义一个表时指定构成的主键的列。这就是所谓的主键约束。SQL Server使用主键约束以保证所有值的唯一性在指定的列从未侵犯。通过确保这个表有一个主键来实现这个表的实体完整性。有时,在一个表中一个以上的列(或列的组合)可以唯一标志一行,例如,雇员表可能有员工编号( emp_id )列和社会安全号码( soc_sec_num )列,两者的值都被认为是唯一的。这种列经常被称为替代键或候选键。这些项也必须是唯一的。虽然一个表只能有一个主键,但是它可以有多个候选键。 SQL Server的支持多个候选键概念进入唯一性约束。当一列或列的组合被声明是唯一的, SQL Server 会阻止任何行因为违反这个唯一性而进行的添加或更新操作。在没有故指的或者合适的键存在时,指定一个任意的唯一的数字作为主键,往往是最有效的。例如,企业普遍使用的客户号码或账户号码作为唯一识别码或主键。通过允许一个表中的一个列拥有身份属性,SQL Server可以更容易有效地产生唯一数字。您使用的身份属性可以确保每个列中的值是唯一的,并且值将从你指定的起点开始,以你指定的数量进行递增(或递减)。(拥有特定属性的列通常也有一个主键或唯一约束,但这不是必需的。)第二种类型的数据完整性是参照完整性。 SQL Server实现了表和外键约束之间的逻辑关系。外键是一个表中的列或列的组合,连接着另一个表的主键(或着也可能是替代键)。这两个表之间的逻辑关系是关系模型的基础;参照完整性意味着这种关系是从来没有被违反的。例如,一个包括出版商表和标题表的简单的select例子。在标题表中,列title_id (标题编号)是主键。在出版商表,列pub_id (出版者ID )是主键。 titles表还包括一个pub_id列,这不是主键,因为出版商可以发布多个标题。相反, pub_id是一个外键,它对应着出版商表的主键。如果你在定义表的时候声明了这个关系, SQL Server由双方执行它。首先,它确保标题不能进入titles表,或在titles表中现有的pub_id无法被修改,除非有效的出版商ID作为新pub_id出现在出版商表中。其次,它确保在不考虑titles表中对应值的情况下,出版商表中的pub_id的值不做任何改变。以下两种方法可

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

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计算机专业英语名词(缩写及翻译)

AAT(Average access time,平均存取时间) ABS(Auto Balance System,自动平衡系统) AM(Acoustic Management,声音管理) ASC(Advanced Size Check,高级尺寸检查) ASMO(Advanced Storage Magneto-Optical,增强形光学存储器) AST(Average Seek time,平均寻道时间) ATA(Advanced Technology Attachment,高级技术附加装置)ATOMM(Advanced super Thin-layer and high-Output Metal Media,增强形超薄高速金属媒体) BBS(BIOS Boot Specification,基本输入/输出系统启动规范) BPI(Bit Per Inch,位/英寸) bps(bit per second,位/秒) bps(byte per second,字节/秒) CAM(Common Access Model,公共存取模型) CF(CompactFlash Card,紧凑型闪存卡) CHS(Cylinders、Heads、Sectors,柱面、磁头、扇区) CSS(Common Command Set,通用指令集) DBI(dynamic bus inversion,动态总线倒置) DIT(Disk Inspection Test,磁盘检查测试) DMA(Direct Memory Access,直接内存存取) DTR(Disk Transfer Rate,磁盘传输率) EIDE(enhanced Integrated Drive Electronics,增强形电子集成驱动器)eSATA(External Serial ATA,扩展型串行ATA) FDB(fluid-dynamic bearings,动态轴承) FAT(File Allocation T ables,文件分配表) FC(Fibre Channel,光纤通道) FDBM(Fluid dynamic bearing motors,液态轴承马达) FDB(Fluid Dynamic Bearing,非固定动态轴承) FDC(Floppy Disk Controller,软盘驱动器控制装置) FDD(Floppy Disk Driver,软盘驱动器) GMR(giant magnetoresistive,巨型磁阻) HDA(Head Disk Assembly,头盘组件) HiFD(high-capacity floppy disk,高容量软盘) IDE(Integrated Drive Electronics,电子集成驱动器) IPEAK SPT(Intel Performance Evaluation and Analysis Kit - Storage Performance Toolkit,英特尔性能评估和分析套件- 存储性能工具包)JBOD(Just a Bunch Of Disks,磁盘连续捆束阵列) LBA(Logical Block Addressing,逻辑块寻址) MR(Magneto-resistive Heads,磁阻磁头) MBR(Master Boot Record,主引导记录) ms(Millisecond,毫秒) MSR(Magnetically induced Super Resolution,磁感应超分辨率)MTBF(Mean Time Before Failure,平均无故障时间) NQC(Native Queuing Command,内部序列命令)

污水处理 英文文献3 翻译

丹宁改性絮凝剂处理城市污水 J.Beltrán-heredia,J.ánche z-Martin 埃斯特雷马杜拉大学化学工程系和物理化学系,德埃娃儿,S / N 06071,巴达霍斯,西班牙 摘要 一种新的以丹宁为主要成分的混凝剂和絮凝剂已经过测试用以处理城市污水。TANFLOC 证实了其在浊度的去除上的高效性(接近100%,取决于剂量),并且近50%的BOD5和COD 被去除,表明TANFLOC是合适的凝集剂,效力可与明矾相媲美。混凝絮凝剂过程不依赖于温度,发现最佳搅拌速度和时间为40转/每分钟和30分钟。多酚含量不显著增加,30%的阴离子表面活性剂被去除。沉淀过程似乎是一种絮凝分离,所以污泥体积指数和它随絮凝剂剂量的改变可以确定。证明TANFLOC是相当有效的可用于污水处理的混凝絮凝剂。 关键词: 基于丹宁的絮凝剂城市污水絮凝天然混凝剂 1.简介 人类活动是废物的来源。特别是在城市定居点,来自家庭和工业的废水可能是危险有害的产品[ 1 ],需要适当的处理,以避免对环境[ 2 ]和健康的影响[ 3,4 ]。2006年12月4日联合国大会通过决议宣布2008为国际卫生年。无效的卫生基础设施促使每年220万人死于腹泻,主要在3岁以下儿童,600万人因沙眼失明,两亿人感染血吸虫病,只是为了给出一些数据[ 5 ]。显然,他们中的大多数都是在发展中国家,所以谈及城市污水,必须研究适当的技术来拓宽可能的处理技术种类。 在这个意义上,许多类型的水处理被使用。他们之间的分歧在于经济和技术特点上。了摆脱危险的污染[ 6 ],一些令人关注的论文已经发表的关于城市污水处理的几种天然的替代方法,包括绿色过滤器、化学初步分离、紫外消毒[ 7 ]和多级程序[ 8 ]。 几个以前的文件指出了城市污水管理[9,10]的重要性。这种类型的废物已成为社会研究的目标,因为它涉及到几个方面,都与社会结构和社会组织[11 ]相关。根据这一维度,必须认识到废水管理作为发展中国家的一种社会变化的因素,事关污水处理和生产之间的平衡,是非常重要的,一方面,人类要发展,另一方面,显而易见。 对水处理其它程序的研究一直是这和其他文件的范围。几年来,研究者关注的是发展中国家间的合作,他们正在致力于水处理的替代过程,主要考虑可持续发展,社会承受能力和可行性等理念。在这个意义上,自然混凝絮凝剂这一广为传播,易于操作的资源即使是非专业人员也不难操作。有一些例子,如辣木[ 14 ]和仙人掌榕[ 15 ]。丹宁可能是一个新的混凝剂和絮凝剂。 一些开拓者已经研究了丹宁水处理能力。 ?zacar和sengil [ 16 ]:从瓦罗NIA获得的丹宁,从土耳其的autoctonous树的果壳中获得丹宁,并用于他们的–污水混凝絮凝过程。他们表明,丹宁有很好的效果,结合Al2(SO4)3可进一步提高污泥去除率。 詹和赵[ 17 ]试着用丹宁为主要成分的凝胶作为吸收剂除去水中的铝,丹宁凝胶改进了金属去除过程,一定意义上也可参照Nakano等人的[ 18 ],Kim 和Nakano[ 19 ]。 ?zacar和sengil [ 20 ]加强以前的文章给出了关于三卤甲烷的形成和其他不良化合物特殊的数据,以及处理后的水质安全。他们始终使用丹宁与Al2(SO4)3的组合。 帕尔马等人将丹宁从辐射松的树皮为原位提取,用于重金属去除中聚合固体。树皮本

英文参考文献翻译完结

基于反馈神经网络肘关节力矩的动态预测 R.Song K.Y.Tong 健康技术与信息学系,香港理工大学 KowIoon,香港

摘要 肌肉模型是身体部分运动分析的一个重要组成部分。尽管许多研究已经集中在静态条件下,但是肌电信号(EMG)和关节转矩在自愿动态情况下之间的关系并没有被很好的研究。本研究的目的是调查的一个反馈人工神经网络的性能(RANN)自愿动态情况下的复杂肘扭矩估计。肌电信号和运动数据,其中包括角度和角速度,被用来作为估计在运动过程中预期的扭矩输入。此外,角度和角速度的预测精度的作用进行了研究,并比较两个模型。一个模型的肌电图和关节运动的投入和其他的模型只使用肌电图无运动数据输入。六例健康体检者,和两个平均角速度(60°S 7和90°S 7)三种不同负荷(0公斤,1公斤,2公斤)在手的位置被选择来训练和测试90°屈肘、全伸肘之间的递归神经网络(0 ~)。训练结束后,根平均平方误差(RMSE)预期的扭矩和扭矩之间的模型预测,在训练数据集的肌电图和关节运动的投入和测试数据集,分别为0.17±0.03 nm和0.35 + 0.06 nm。预期的扭矩和预测模型的RMSE值之间的扭矩,在训练数据集只有肌电输入和测试集,分别为0.57 t - 0.07 nm和0.73 T 0.11 nm。结果表明,肌电信号一起运动的数据提供了更好的性能预测的关节力矩;关节角度和角速度提供了重要信息的关节力矩的估计在自愿的运动。 关键词:肌肉骨骼模型,自愿的运动,反馈人工神经网络,逆动力学模型

第一章绪论 由于希尔提出了1938肌肉的经典论文,神经生理学和神经肌肉骨骼系统的生物力学已被广泛研究,使人体运动生成的原理可以发现(希尔,1938)。 探讨中枢神经系统(CNS)激发肌肉和其后的发展力和产生不同的人体运动,许多模型来描述和定性的肌肉骨骼系统的不同层次的性能(温特斯,1990;扎杰克和温特斯,1990)。一个被普遍接受的山为基础的神经肌肉骨骼系统由以下子模型,一步一步:肌肉兴奋-收缩模型;肌腱骨骼模型;动态模型(扎耶克,1989)。 图1 肌肉骨骼模型框图 图1显示了基于hillbased模型的运动生成。图1,肌肉兴奋收缩模型是用来估计中枢神经系统指挥肌肉活动的状态。肌腱模型产生的肌肉力量不仅基于肌肉激活状态,而且基于肌腱式长度和肌腱式收缩速度,这与关节角速度和角速度(温特斯和斯塔克,1988)。前项状态的肌肉力量,它决定了肌腱的依从性,还负责肌肉力在后一阶段(扎耶克,1989)。一旦所有负责的关节运动的肌肉力量已经发现,肌肉的力量与各自的肌肉力臂和的结果求和乘法可以产生关节力矩。所有子模型的数学积分可以用来描述关节运动是中枢神经系统的命令产生哪些参数斧负责关节力矩。 肌电信号反映肌肉的活动,和许多类似的肌电力矩的关系已经在静态和动态情况的研究(张等人,1997;麦森纳和莫润,1995)。肌肉的肌电信号也常被认

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.

计算机专业外文文献及翻译

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