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important theoretical
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     This study has important theoretical and practical meaning in assessing the weldability of steel20MnMo .
     该项研究对于评价20MnMo钢的焊接性能具有重要的理论意义及工程实际应用价值。
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     The method is of important theoretical significance for their reliability design and provides guidance to their reliability calculation.
     该方法对于机械系统可靠性设计具有理论意义,对生产实际机械系统可靠度的计算具有实际指导意义。
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     The studies about transformation and effective using of soil water in tobacco fields have important theoretical and practical significances for the perfection of irrigation theory and technique of tobacco and the development of water saving agriculture.
     关于烟田土壤水分转化问题及土壤水分有效利用的研究,对完善烟草节水灌溉理论与技术,指导烟民根据土壤的水分特性进行科学灌溉并确保烟草的产量和品质,发展节水农业具有重要的理论意义和应用价值。
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     It has important theoretical meaning and realistic meaning to study the ethical examination of modern technology.
     研究现代技术的伦理审视与调控问题也就因此具有了重要的理论意义和现实意义。
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     Our analysis of these opinions has very important theoretical significance and practical effect on the correct understanding of the function of moral emotions.
     我们分析这些主张和思路 ,对于正确理解道德情感的作用 ,充分估计道德主体的能力保证及其局限 ,具有十分重要的理论意义与实践效应
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  “important theoretical”译为未确定词的双语例句
     Energy Flow and Biogeochemical Cycle in Ecosystem——an Important Theoretical Base of Environmental Science
     生态系统的能流与生物地球化学循环——环境科学的重要理论基础
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     Scientific Development Views—An Important Theoretical Creation of Our Party to Development Views
     科学发展观是我党对发展理论的重大创新
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     Some important theoretical analysis and research results are as follows:(1) A brief review of unmanned helicopter and application of nonlinear control is given.
     本文针对纵列式无人直升机的独特性能,重点研究了纵列式无人直升机的建模及其非线性控制设计,主要研究内容和研究成果包括:(1) 综述并分析了无人直升机的研究现状及非线性控制方法。
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     Almost important theoretical systems and thoughts concern about the research of employment and unemployment, and offer different economic interpretations from different analytical methods.
     在经济学理论、思想的发展中,几乎所有重要的理论体系和理论思想,都无不关注对就业和失业问题的研究,并且各自从不同的分析方法出发对就业和失业问题提出不同的经济学解释。
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     Pushing the "Green GDP" system has the important theoretical and practical significance for realizing the increase of the economy, developing the society, protecting the environment, which are called the "three wins" goal.
     推行“绿色GDP”制度对实现经济增长、社会进步和环境保护的“三赢”目标,对于我国林业生态建设,对于全面建设小康社会具有重要的理论与实践意义。
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     On Some Important theoretical Questions of Constitutionalism
     关于宪政的几个基本理论问题
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     So there are important theoretical and applied significances.
     由此开展此项研究具有重要的理论和实际意义。
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     IMPORTANT DATA
     重要数据
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     Theoretical study
     其主要内容包括:理论研究
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  important theoretical
Another important theoretical method is the reflectivity method [4].
      
Some important theoretical problems of the planetary-scale monsoons which have arisen from recent advances of observational studies are reviewed.
      
High labor force participation by the rural poor has important theoretical and policy implications for understanding the causes, consequences and intervention strategies for combating poverty.
      
Their model is similar in structure to the theory of reasoned action, but has important theoretical and operational differences.
      
It is shown how the fundamental electronic driving force for the selectivity is related via the moments approach to other important theoretical ideas, such as Walsh's rules and the Woodward-Hoffmann rules.
      
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Seismic modelling is an important theoretical problem in seismic prospecting. This paper presents a modelling system in which the ray tracing procedures are used to cal-culate the two-dimensional synthetic seismogram, with finite elements representing com-plicated subsurface structures, thus producing their theoretical section. The system can be applied to the modelling of lithology or geological structures, which would offer use-ful information for the interpretation. A general program for computing...

Seismic modelling is an important theoretical problem in seismic prospecting. This paper presents a modelling system in which the ray tracing procedures are used to cal-culate the two-dimensional synthetic seismogram, with finite elements representing com-plicated subsurface structures, thus producing their theoretical section. The system can be applied to the modelling of lithology or geological structures, which would offer use-ful information for the interpretation. A general program for computing arbitrary complicated structures has been prepared. It proved effective in calculating a series of models for a certain seismic profile. These synthetic sections were displayed on tele-vision. The paper ends with a brief discussion and analysis of the results thus obtained.

复杂地层构造的地震模拟,是地震勘探理论的重要问题。本文提出了一个模拟系统:用有限元素表示复杂地层构造,在此基础上应用射线轨迹法计算二维合成记录,从而得到复杂地层构造的理论剖面。这个系统可以用来模拟构造和岩性,为解释人员提供理论依据。 作者研制了适用于任意复杂地层构造计算的通用程序,并用以计算了某测线的一批模型,所得合成剖面由电视加以显示,最后对结果作了简单的分析讨论。

Braided river is an important pattern in alluvial rivers. There are 41 braided reaches in the middle and lower Yangtze River, to study some problems of braided reaches has very important theoretical and practical senses.In this paper, four problems are discussed.( 1 ) Some basic elements, such as depth, width, cross-sectional area, velocity, etc, of the braided reaches are discussed. It is found that values of these basic elements either in the main branching channel or in the secondary branching channel...

Braided river is an important pattern in alluvial rivers. There are 41 braided reaches in the middle and lower Yangtze River, to study some problems of braided reaches has very important theoretical and practical senses.In this paper, four problems are discussed.( 1 ) Some basic elements, such as depth, width, cross-sectional area, velocity, etc, of the braided reaches are discussed. It is found that values of these basic elements either in the main branching channel or in the secondary branching channel are less than those of the single channel, but the sum of these values of branching channels are larger than that of the single channel. In view of flood control, the braided reaches can carry more flood flow, so that, when it is decided to block the secondary branch by any submerged body, the overall condition must be considered.( 2 ) From the observed data either in field or in river model investigation, there is circulating flow at the island head. Depending upon .this fact, both the longitudinal transportation of suspended load and the transverse transportation of suspended load by circulating flow at the island head are considered when the diversion ratios of sediment in braided reaches are studied, and Eqs. ( 20 ) and ( 21 ) for computing these diversion ratios are derived. The results calculated from Eqs. ( 20 ) and ( 21 ) are coincident well with the observed data from fiefd as shown in Fig. 6.( 3 ) Suspended load connects closely with fluvial process, but bed material load is a very important factor in view of fluvial process . Due to this reason, the diversion ratio of bed material load in braided reaches must also be studied.On the one hand, only the longitudinal transportation of bed material load is considered, and on the other hand, both the longitudial transportation and the transverse transportation of bed material load by circulating flow at the island head are also considered. Then, Eqs. ( 25 ) , ( 26 ) , ( 27) and(28)are derived. The results calculated from these equations are shown in Figs. 11 and 12, it is seen that the results in Fig. 12 is coincident better than those in Fig. 11 with the observed data from field.( 4 ) The field data observed in the middle and lower reaches of the Yangtze River are analysed, and the parameters C and C* describing the degree of uniform distribution of suspended sediment and bed material load along the depth are found. At the same time, their relationship C* = 0.2C0.8 is obtained approximately, from which C* can be determined from known C easily.

本文首先论证了汊道的一些基本因素与单一河段的变化关系,其次探讨了洲头横向输沙对汊道分沙的作用,从而提出了综合考虑纵向和横向输沙的计算悬移质分沙比的办法和公式,进而又探讨了计算床沙质分沙比的办法和公式,最后建立了长江中下游悬移质、床沙质一些参数的关系。经实测资料检验,比较符合实际。

Anodic processes, occurring on the carbon anode in aluminium electrolysis , have ever attracted much more attention . They are of very important theoretical interest and are closely related with energy consumption in aluminium eletrolysis. However, the mechanism of their occurrence is still not very clear. An extensive study of such complicated processes as the discharge of anions on carbon anode and the anode effect is made and presented in this paper.Summary. The electrochemical reactions occurring on...

Anodic processes, occurring on the carbon anode in aluminium electrolysis , have ever attracted much more attention . They are of very important theoretical interest and are closely related with energy consumption in aluminium eletrolysis. However, the mechanism of their occurrence is still not very clear. An extensive study of such complicated processes as the discharge of anions on carbon anode and the anode effect is made and presented in this paper.Summary. The electrochemical reactions occurring on the carbon anode were studied with a potential sweep technique, and the voltage and current waves before and after the anode effect were observed on the screen of a cathode ray oscillograph. There were three current peaks in the potential sweep range of 0~5V. The peak voltages were as follows: Ep1 = 1.6V, Ep2=2.2V, EP3=3. 8V. These peak voltages correspond to the following electrochemical reactions respectively: discharge of oxygen ions, co discharge of oxygen and fluorine ions and discharge of fluorine ions. In the reversing sweep, however, there was no cathodic current. Therefore these three reactions are all irreversible. In the alumina concentration range of 0~1.5%(wt.), the critical current density for anode effect is determined by ip2, while the alumina concentration exceeded 2%(wt.) it is determined by ip1. Hence it is suggested that there may be a boundary line in the structure of cryolite-alumina melts at alumina concentration of 2%(wt.). On the basis of the experimental results obtained, the mechanism of anodic processes on carbon anode is discussed. Fig.1 The potential sweep voltammogram on graphite anode Natural cryolite; 1050℃; Va = VC = 0.075 V/s; A=0.37cm2.Fig.2 The oscillograms of voltage (upper curves) and current(lower curves) in aluminium electrolysis obtained with a positive impulse current(a),(b)and(c)--during normal electrolysis; (d),(e)and(f) -during anode effect. Voltage scale 0.5V, current scale 0.5A.Fig.3 The voltammograms with continuous potential sweep (a) v = 2.25.V/s; (b)v = 150V/s.Fig.4 The voltammograms at various sweeping rate(a) 0.075V/s; (b) 0.22V/S; (c) 0.45V/S; (d) 2.25V/s.Electrolyte-Na3AlF6 + 5% MgF2 + 0.4%A12O3,1000℃.Fig.5 The relationship between peak current density ( ccd )and sweeping rate at 1000℃.(a) Na3AlF6+5%MgF2+0.2%Al2O3;(b) Na3AlF6 + 5%MgF2+0.4%Al203;Fig.6 The relationship between alumina concentration and critical currentdensity, at 1000℃. Fig.7 The voltammogramas at various alumina concentrations with 5%MgF2 in all cases and with a sweeping rate of 0.075 V/s,1000℃and A = 0.37cm2.(a) 0.4%; (b) 1.0%, (c) 1.5%; (d) 2.0%. Fig.8 The schematic diagram for added reaction rateFull line-potential sweep diagram for added reactions; Dashed line-potential sweep diagrams for separated reactions. Fig.9 The influence of temperature on critical current density(1) 0.4%A1203; (2) 1.0%A12O3; (3) 1.5%A12O3; (4) 2.0A12O3.Sweeping rate 0.1V/s. Fig.10 The voltammograms at various ending potential (Eh)(a) 4.5V; (b) 3.6V; (c) 2.6V; (d) 2.4V.Tab.1 The possible reactions during the occurrence of anode effect Tab.2 The activation energy at various alumina concentration

本文用电位扫描法研究了冰晶石-氧化铝熔液中石墨阳极上发生的各种电化学反应,并用示波技术观察了阳极效应前后的电压和电流波形图,进而讨论了阳极过程的机理问题。

 
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