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The supercritical watercooled reactor has favorable features in economics, sustainability and technology availability.


The Krasovskii selforganizing regulators for optimal control of dynamic processes is shown to be applicable in economics.


Numerous applications of the continuous logic to mathematics, engineering, economics, social sciences, and so on were described, and its perspectives were estimated.


An important problem in economics is the construction of an effective minimalcost management hierarchy for an economic system.


Nonnegative largescale linear programming problems with group constraints are extremely important for different applications in economics, technology, and other spheres.

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 This article describes briefly the design and economics of masonry dam, as well as the conventional practice used in its construction in Hunan province. It contains informations on methods of quarrying, hauling, laying of stones, preparing of mortar, means for prevention of seepage through masonry, etc. It is rather difficult to make a complete comparison of the advantages or disadvantage of all various types of dams. Here, the authors only introduce some principal experience of building masonry dams prevailed... This article describes briefly the design and economics of masonry dam, as well as the conventional practice used in its construction in Hunan province. It contains informations on methods of quarrying, hauling, laying of stones, preparing of mortar, means for prevention of seepage through masonry, etc. It is rather difficult to make a complete comparison of the advantages or disadvantage of all various types of dams. Here, the authors only introduce some principal experience of building masonry dams prevailed in Hunan, which may serve as an advising reference for improvement in future design and construction of dams of this type.  本文论述砌石坝的设计及其经济性,并介绍湖南省兴建砌石坝的实际经验。内容包括石料开采和转运、砌置的方法、沙浆的制备及砌石体的防渗措施等有关资料。对各种不同坝型的优缺点作出评论是颇复杂的。在此,我们仅提出在湖南兴建砌石坝通行的一些经验,作为对砌石坝设计施工进一步改进发展的参考。  Basic requirements of modern dry caigo ships such as deadweight, speed, restrictionto dimensions, and variable parameters such as block coefficient, dimension proportionsare analyzed. Method of determining principal dimensions, details of initial stability andpowering calculations, as well as method of route analysis, calculation of economiccriteria are described. The various formulae and coefficients are discussed. An exampleof analysis of a 15000 tons deadweight cargo ship's principal dimensions is given.... Basic requirements of modern dry caigo ships such as deadweight, speed, restrictionto dimensions, and variable parameters such as block coefficient, dimension proportionsare analyzed. Method of determining principal dimensions, details of initial stability andpowering calculations, as well as method of route analysis, calculation of economiccriteria are described. The various formulae and coefficients are discussed. An exampleof analysis of a 15000 tons deadweight cargo ship's principal dimensions is given. Theinfluences of several factors sush as number of days in port, cost of fuel etc. onoperating economics of ship are discussed. Finally the effect of water ballast quantityon trim and stability at ballast condition is illustrated on the basis of the results ofcalculations.  本文对现代干货船的载重量、航速、主尺度限制等基本要求和方形系数、主尺度比值等变化参数进行了分析研究。叙述了决定主尺度的方法和进行初稳性,航速计算的方法与航线分析和经济指标计算的方法。对所采用的各计算式和系数进行了讨论。本文以一艘载重量15000吨干货船主尺度分析为实例并探讨了仃港日数和燃油价格等因素对船舶经济性的影响。最后通过计算表示了船的压载量对空放压载航行的浮态与稳性的影响。  In this paper, a noval process for extraction of potassium from seawater at constant temperature with the Chinese natural zeolite as adsorbent is described. The result is as follows: both 3.5N NH4Cl and mixed NH4C1NaCl solution (NH4C1 3.5N, NaC1 2.8N) are effective scrubbing agents of K+, but the NHtype zeolite, or else the quantity of NH which is carried away by seawater would be too great. In order to depress the lose of ammonia, technological experiments are conducted to test the effects of modification... In this paper, a noval process for extraction of potassium from seawater at constant temperature with the Chinese natural zeolite as adsorbent is described. The result is as follows: both 3.5N NH4Cl and mixed NH4C1NaCl solution (NH4C1 3.5N, NaC1 2.8N) are effective scrubbing agents of K+, but the NHtype zeolite, or else the quantity of NH which is carried away by seawater would be too great. In order to depress the lose of ammonia, technological experiments are conducted to test the effects of modification methods of zeolite: single stages modification with different ratio of scrubbing agent and modifying agent. An effective process for depressing ammonia loss at constant temperature have been obtained, when natural zeolite used as K+ adsorbent at constant temperature, the NaHCO3 mother liquid of Solvaysoda process, after stripping off NH3, may be taken as scrubbing agent. Extraction of potassium is combined with hot ammonium chloride process, such technological scheme is rational from the standpoint of economics and technology. The main technical characteristics are: effective adsorption capacity of K+ by zeolite=13kg K+/Ton, production rate of Zeolite=0.271 kg K+/Ton. hr, ammonia loss is dependent upon the ratio of the quantity of extracted K+and Na2CO3 is varied from 5 to 59kg NH3/Ton.KC1, Scrubbed solution K+ varied from 19 to 20 g/l; composition of mixed NH4C1KCl fertilizer is NH4Cl:KCl=3.17~3.27:1.  本文以国产天然沸石为吸附剂，研究在常温下进行海水提钾的新工艺。试验表明：３．５Ｎ左右的 ＮＨ４Ｃｌ 洗脱剂或 ＮＨ４Ｃｌ—ＮａＣｌ混合洗脱剂（ＮＨ４Ｃｌ３．５Ｎ； ＮａＣｌ２．８Ｎ） 均有较强的洗脱Ｋ＋的能力。但ＮＨ型沸石需再用饱和盐水改型，回收柱上的ＮＨ，否则在海水吸附钾时随海水流失的ＮＨ量太大。为了降低氨的损耗，工艺试验着重在改型上进行多方面的探索和考察：用盐水一次改型、分段改型（洗脱剂与改型剂不同配比时的分段改型）。最终提出了有效降低氨耗的常温洗脱的工艺路线，即以天然沸石为吸附剂，在常温下以滤碱脱氨母液为洗脱剂，将海水提钾与热法联碱工业相结合的新途径。工艺流程的安排在经济上较为合理，在技术上是可行的。小试达到的主要技术指标为：沸石对钾的有效吸附容量：１３公斤Ｋ＋／吨沸石；沸石生产强度：０．２７１公斤Ｋ＋／吨·小时；氨耗系由提钾与制碱的比例而定，可控制在５～５９公斤氨／吨氯化钾；洗脱液Ｋ＋含量１９～２０克／升；所得ＮＨ４Ｃｌ－ＫＣｌ混肥的组成：ＮＨ４Ｃｌ与ＫＣｌ之比为３．１７～３．２７：１。   << 更多相关文摘 
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