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数控技术和装备发展趋势及对策外文翻译

数控技术和装备发展趋势及对策外文翻译
数控技术和装备发展趋势及对策外文翻译

零售企业营销策略中英文对照外文翻译文献

零售企业营销策略中英文对照外文翻译文献(文档含英文原文和中文翻译)

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污水处理外文翻译(带原文)

提高塔式复合人工湿地处理农村生活污水的 脱氮效率1 摘要: 努力保护水源,尤其是在乡镇地区的饮用水源,是中国污水处理当前面临的主要问题。氮元素在水体富营养化和对水生物的潜在毒害方面的重要作用,目前废水脱氮已成为首要关注的焦点。人工湿地作为一种小型的,处理费用较低的方法被用于处理乡镇生活污水。比起活性炭在脱氮方面显示出的广阔前景,人工湿地系统由于溶解氧的缺乏而在脱氮方面存在一定的制约。为了提高脱氮效率,一种新型三阶段塔式混合湿地结构----人工湿地(thcw)应运而生。它的第一部分和第三部分是水平流矩形湿地结构,第二部分分三层,呈圆形,呈紊流状态。塔式结构中水流由顶层进入第二层及底层,形成瀑布溢流,因此水中溶解氧浓度增加,从而提高了硝化反应效率,反硝化效率也由于有另外的有机物的加入而得到了改善,增加反硝化速率的另一个原因是直接通过旁路进入第二部分的废水中带入的足量有机物。常绿植物池柏(Taxodium ascendens),经济作物蔺草(Schoenoplectus trigueter),野茭白(Zizania aquatica),有装饰性的多花植物睡莲(Nymphaea tetragona),香蒲(Typha angustifolia)被种植在湿地中。该系统对总悬浮物、化学需氧量、氨氮、总氮和总磷的去除率分别为89%、85%、83%、83% 和64%。高水力负荷和低水力负荷(16 cm/d 和32 cm/d)对于塔式复合人工湿地结构的性能没有显著的影响。通过硝化活性和硝化速率的测定,发现硝化和反硝化是湿地脱氮的主要机理。塔式复合人工湿地结构同样具有观赏的价值。 关键词: 人工湿地;硝化作用;反硝化作用;生活污水;脱氮;硝化细菌;反硝化细菌 1. 前言 对于提高水源水质的广泛需求,尤其是提高饮用水水源水质的需求是目前废水深度处理的技术发展指向。在中国的乡镇地区,生活污水是直接排入湖泊、河流、土壤、海洋等水源中。这些缺乏处理的污水排放对于很多水库、湖泊不能达到水质标准是有责任的。许多位于中国的乡镇地区的社区缺乏足够的生活污水处理设备。由于山区地形、人口分散、经济基础差等原因,废水的收集和处理是很成问题的。由于资源短缺,经济欠发达地区所采取的废水处理技术必须低价高效,并且要便于施用,能量输入及维护费用较低,而且要保证出水能达标。建造在城市中基于活性污泥床的废水集中处理厂,对于小乡镇缺乏经济适用性,主要是由于污水收集结构的建造费用高。 1Ecological Engineering,Fen xia ,Ying Li。

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市场营销策略外文文献及翻译 Marketing Strategy Market Segmentation and Target Strategy A market consists of people or organizations with wants,money to spend,and the willingness to spend it.However,within most markets the buyer' needs are not identical.Therefore,a single marketing program starts with identifying the differences that exist within a market,a process called market segmentation, and deciding which segments will be pursued ads target markets. Marketing segmentation enables a company to make more efficient use of its marketing resources.Also,it allows a small company to compete effectively by concentrating on one or two segments.The apparent drawback of market segmentation is that it will result in higher production and marketing costs than a one-product,mass-market strategy.However, if the market is correctly segmented,the better fit with customers' needs will actually result in greater efficiency. The three alternative strategies for selecting a target market are market aggregation,single segment,and multiple segment.Market-aggregation strategy involves using one marketing mix to reach a mass,undifferentiated market.With a single-segment strategy, a company still uses only one marketing mix,but it is directed at only one segment of the total market.A multiple-segment strategy entails

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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

外文文献(市场营销策略)

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外文翻译原文

204/JOURNAL OF BRIDGE ENGINEERING/AUGUST1999

JOURNAL OF BRIDGE ENGINEERING /AUGUST 1999/205 ends.The stress state in each cylindrical strip was determined from the total potential energy of a nonlinear arch model using the Rayleigh-Ritz method. It was emphasized that the membrane stresses in the com-pression region of the curved models were less than those predicted by linear theory and that there was an accompanying increase in ?ange resultant force.The maximum web bending stress was shown to occur at 0.20h from the compression ?ange for the simple support stiffness condition and 0.24h for the ?xed condition,where h is the height of the analytical panel.It was noted that 0.20h would be the optimum position for longitudinal stiffeners in curved girders,which is the same as for straight girders based on stability requirements.From the ?xed condition cases it was determined that there was no signi?cant change in the membrane stresses (from free to ?xed)but that there was a signi?cant effect on the web bend-ing stresses.Numerical results were generated for the reduc-tion in effective moment required to produce initial yield in the ?anges based on curvature and web slenderness for a panel aspect ratio of 1.0and a web-to-?ange area ratio of 2.0.From the results,a maximum reduction of about 13%was noted for a /R =0.167and about 8%for a /R =0.10(h /t w =150),both of which would correspond to extreme curvature,where a is the length of the analytical panel (modeling the distance be-tween transverse stiffeners)and R is the radius of curvature.To apply the parametric results to developing design criteria for practical curved girders,the de?ections and web bending stresses that would occur for girders with a curvature corre-sponding to the initial imperfection out-of-?atness limit of D /120was used.It was noted that,for a panel with an aspect ratio of 1.0,this would correspond to a curvature of a /R =0.067.The values of moment reduction using this approach were compared with those presented by Basler (Basler and Thurlimann 1961;Vincent 1969).Numerical results based on this limit were generated,and the following web-slenderness requirement was derived: 2 D 36,500a a =1?8.6?34 (1) ? ??? t R R F w ?y where D =unsupported distance between ?anges;and F y =yield stress in psi. An extension of this work was published a year later,when Culver et al.(1973)checked the accuracy of the isolated elas-tically supported cylindrical strips by treating the panel as a unit two-way shell rather than as individual strips.The ?ange/web boundaries were modeled as ?xed,and the boundaries at the transverse stiffeners were modeled as ?xed and simple.Longitudinal stiffeners were modeled with moments of inertias as multiples of the AASHO (Standard 1969)values for straight https://www.doczj.com/doc/765945091.html,ing analytical results obtained for the slenderness required to limit the plate bending stresses in the curved panel to those of a ?at panel with the maximum allowed out-of-?atness (a /R =0.067)and with D /t w =330,the following equa-tion was developed for curved plate girder web slenderness with one longitudinal stiffener: D 46,000a a =1?2.9 ?2.2 (2) ? ? ? t R f R w ?b where the calculated bending stress,f b ,is in psi.It was further concluded that if longitudinal stiffeners are located in both the tension and compression regions,the reduction in D /t w will not be required.For the case of two stiffeners,web bending in both regions is reduced and the web slenderness could be de-signed as a straight girder panel.Eq.(1)is currently used in the ‘‘Load Factor Design’’portion of the Guide Speci?cations ,and (2)is used in the ‘‘Allowable Stress Design’’portion for girders stiffened with one longitudinal stiffener.This work was continued by Mariani et al.(1973),where the optimum trans-verse stiffener rigidity was determined analytically. During almost the same time,Abdel-Sayed (1973)studied the prebuckling and elastic buckling behavior of curved web panels and proposed approximate conservative equations for estimating the critical load under pure normal loading (stress),pure shear,and combined normal and shear loading.The linear theory of shells was used.The panel was simply supported along all four edges with no torsional rigidity of the ?anges provided.The transverse stiffeners were therefore assumed to be rigid in their directions (no strains could be developed along the edges of the panels).The Galerkin method was used to solve the governing differential equations,and minimum eigenvalues of the critical load were calculated and presented for a wide range of loading conditions (bedding,shear,and combined),aspect ratios,and curvatures.For all cases,it was demonstrated that the critical load is higher for curved panels over the comparable ?at panel and increases with an increase in curvature. In 1980,Daniels et al.summarized the Lehigh University ?ve-year experimental research program on the fatigue behav-ior of horizontally curved bridges and concluded that the slen-derness limits suggested by Culver were too severe.Equations for ‘‘Load Factor Design’’and for ‘‘Allowable Stress Design’’were developed (respectively)as D 36,500a =1?4?192(3)? ?t R F w ?y D 23,000a =1?4 ?170 (4) ? ? t R f w ?b The latter equation is currently used in the ‘‘Allowable Stress Design’’portion of the Guide Speci?cations for girders not stiffened longitudinally. Numerous analytical and experimental works on the subject have also been published by Japanese researchers since the end of the CURT project.Mikami and colleagues presented work in Japanese journals (Mikami et al.1980;Mikami and Furunishi 1981)and later in the ASCE Journal of Engineering Mechanics (Mikami and Furunishi 1984)on the nonlinear be-havior of cylindrical web panels under bending and combined bending and shear.They analyzed the cylindrical panels based on Washizu’s (1975)nonlinear theory of shells.The governing nonlinear differential equations were solved numerically by the ?nite-difference method.Simple support boundary condi-tions were assumed along the curved boundaries (top and bot-tom at the ?ange locations)and both simple and ?xed support conditions were used at the straight (vertical)boundaries.The large displacement behavior was demonstrated by Mi-kami and Furunishi for a range of geometric properties.Nu-merical values of the load,de?ection,membrane stress,bend-ing stress,and torsional stress were obtained,but no equations for design use were presented.Signi?cant conclusions include that:(1)the compressive membrane stress in the circumfer-ential direction decreases with an increase in curvature;(2)the panel under combined bending and shear exhibits a lower level of the circumferential membrane stress as compared with the panel under pure bending,and as a result,the bending moment carried by the web panel is reduced;and (3)the plate bending stress under combined bending and shear is larger than that under pure bending.No formulations or recommendations for direct design use were made. Kuranishi and Hiwatashi (1981,1983)used the ?nite-ele-ment method to demonstrate the elastic ?nite displacement be-havior of curved I-girder webs under bending using models with and without ?ange rigidities.Rotation was not allowed (?xed condition)about the vertical axis at the ends of the panel (transverse stiffener locations).Again,the nonlinear distribu-

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