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数值
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  numeric
    Numeric Simulation of liquid Metal Filling up Mold Cavity
    液态金属充填铸型的数值模拟
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    NUMERIC CALCULATION IN DEFORMING PROCESS OF METAL PLASTICITY
    金属塑性变形过程的数值计算方法
短句来源
    Numeric Simulation of the Solidification Process of Aluminium Alloy Piston in Metal Model
    金属型铝合金活塞凝固过程的数值模拟
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    The Numeric Simulation of Weld Residual Stress of Several Weld-Repaired Based on Finite Element
    基于有限元的多次补焊焊接残余应力的数值模拟
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    ANALYSIS AND NUMERIC SIMULATION OF THIN TUBE BULGE FORMING LIMIT
    薄壁管胀形成形极限分析及其数值模拟
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  numerical values
    Application of Irregular Numerical Values in Machine Design
    无规律性数值在机器设计中的应用
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    On the basis of results of numerical values simulation, the technology route of gear workpiece with steel material in positive cold extrusion is ascertained, the mould of cold extrusion is designed, and the gear roughcast is successfully extruded.
    在数值模拟的结果基础上,确定了钢质齿轮零件的正向冷挤压成形工艺路线,设计了冷挤压模具,并进行圆柱直齿轮的冷挤压成形试验,成功地挤压出齿轮毛坯。
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    The result studied indicate the results of practice experimentation are close to the results of numerical values simulation, which shows that the simulation method can be used to direct the precision plastic
    研究结果表明,实际试验结果与数值模拟结果比较接近。 说明这种模拟方法可用于指导圆柱直齿轮精密塑性成形。
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    Besides, a measurement of the suitable angular distortion far the formula and the exchange relation between the numerical values determined respectively with this measurement and with the measurement set by the ministerial standard are presented.
    另外还介绍了适于公式要求的角变形量的测量方法,以及用此法所测得的数值与用部颁标准规定的测量方法测得的数值的互换关系。
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    Through the mathematical equations, numerical values of machining geometrical error caused by machine spindle error motion are calculated.
    通过这些数学表达式可以定量地计算出机床主轴由于回转运动误差产生的加工几何误差数值
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    Computer Simulation, Microstructure Prediction and Technology Optimization of Plate and Strip Hot Rolling
    热轧板带的数值模拟、组织预报及工艺优化
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    Multi-Scale Modeling and FE Simulation during High Temperature Deformation of the Titanium Alloys
    钛合金高温变形时跨层次模型及数值模拟
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    The Application of the Mathematical Model Simulating of TTT Diagram
    TTT曲线数值化的应用
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    Modelling and Simulationof Mold Filling
    铸型充填过程模型化及流动场数值模拟
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    The Application of Computer in Analytical Chemistry-Numerical Methods in Analytical Chemistry (Ⅰ)
    计算机在分析化学中的应用——分析化学中的数值方法(Ⅰ)
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  numeric
Numeric simulation for structure's damage identification of space truss
      
Different classes of logical determinants-numeric characteristics of matrices that can be expressed through the operations of the continuous logic-are studied.
      
Numeric values are introduced to measure the discrepancy between the trees.
      
The calculations were performed in Maple V R5 with the use of the standard subroutine dsolve/numeric for solving ordinary differential equations by the fourth-order Runge-Kutta method.
      
To ensure the convergence of the iterative process implemented in the Numeric package in REDUCE, proper initial data must be specified.
      
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  numerical values
The basic distinction of this approach lies in that here the numerical values of the reliability parameters (probabilities or intensities of faults or failures) of the computing resources are neither given nor used.
      
Numerical values of the parameters of kinetic equations were calculated by the Monte Carlo method.
      
The numerical values of several physical parameters (the parameters of distribution of solar cosmic ray (SCR) particles inside heliosphere traps, the coefficients of trap transparency) that are not observed by direct measurements are estimated.
      
Numerical values of the period and amplitudes of oscillations of the poles are obtained by estimating the elastic deformation of the Earth and the variation of its inertia tensor, and they agree well with observational data.
      
The article gives numerical values of the coefficient of longitudinal mixing found using the method under consideration.
      
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Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain...

Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain boundaries. The activation energy for this grain-boundary creep is 78,000 ± 4,000 calories per mole according to the present creep and stress relaxation measurements. This value is close to the activation energy for self-diffusion of iron, a correlation which indicates that, in so far as to the mechanism of atomic migration is concerned, grain boundaries may not be very different from the interior of the grains.

用99.95%的多晶纯铁作了从350°-525℃的扭转微蠕变及应力弛豫试验,所得结果的概貌与以前用多晶纯铝所得的基本上相同。从蠕变曲线上可以看出这蠕变是由两部分组成的:第一部分是在较低温度或较短时间内发生的,第二部分是在较高温度或较长时间内发生的。第一部分的蠕变是有限的,是由于晶粒间界的粘滞性滑移所引起。根据微蠕变及应力弛豫测量的结果,这一部分蠕变所包含的激活能是78,000±4,000卡/克分子。这个激活能(晶粒间界滑移激活能)的数值与纯铁自扩散的激活能很相近,表示晶粒间界与晶粒内部对于原子迁移的基本过程而言并没有显著的差异。 加碳于纯铁中对于这两部分的蠕变都有显著的影响。最值得注意的结果是含碳量少到0.0004%时已经使晶粒间界的粘滞性滑移受到显著的阻碍。这些发现在控制金属高温蠕变的问题上指出一个一般性的原则,对于以前所提出来的晶粒间界空穴模型也提供了一些新的实验证据。 根据加碳的实验结果,对于第二部分高温蠕变的机构也提出了一个初步的看法,这蠕变所包括的基本过程可能是晶粒内部的空穴中的原子重新排列。

This is the first of a series of papers with a view to evaluation activities inliquid blast-furnace-type slags.The purpose of this paper is to present new results of calculation for activities of CaO and SiO_2 in liquid CaO-SiO_2,CaO-SiO_2-Al_2O_3 and CaO-MgO-SiO_2-Al_2O_3 systems from existing chemical and electrochemi-caldata with certain assumptions The activities of CaO in the above-mentionedsystems with reference to solid CaO as the standard state are plotted against(%CaO)/(%SiO_2).From a comparison of...

This is the first of a series of papers with a view to evaluation activities inliquid blast-furnace-type slags.The purpose of this paper is to present new results of calculation for activities of CaO and SiO_2 in liquid CaO-SiO_2,CaO-SiO_2-Al_2O_3 and CaO-MgO-SiO_2-Al_2O_3 systems from existing chemical and electrochemi-caldata with certain assumptions The activities of CaO in the above-mentionedsystems with reference to solid CaO as the standard state are plotted against(%CaO)/(%SiO_2).From a comparison of these ~αCaO-(%CaO)/(%SiO_2)curves,a new expression for basicity has been proposed instead of the simple(%CaO)/(%SiO_2)ratio.The activities of CaO in the various systems concerned becomeapproximately equal at the same basicity when the latter is calculated accordingto the new formula.Alumina shows amphoteric behaviour in the new basicityformula in agreement with the general pattern of slag constitution.

在本文中,作者综合分析了关于CaO—SiO_2、CaO—SiO_2—Al_2O_3及CaO—MgO—SiO_2—Al_2O_3系统熔渣中α_(SiO_2)及α_(CaO)的测定结果,并加以比较。关于CaO—SiO_2二元系,作者综合了Fulton与Chipman,张禄经与Derge及坂上六郎的实验数据,导出了1600℃时液态渣在整个浓度范围内的α_(SiO_2)及α_(CaO),分别用β鳞石英及固态CaO为标准状态。根据这样算出的α_(SiO_2)及α_(CaO)以及坂上的CaO侧电动势数据,作者导出了一个经验公式,可以用来从已知的电动势数据与α_(SiO_2)计算α_(CaO)。将这个公式应用于CaO—SiO_2—Al_2O_3三元系,算出了三元系熔渣内当Al_2O_3=10、20%时的α_(CaO)。然后将二元系和三元系中的α_(CaO)加以比较,导出了一个新的碱度计算公式。在此式中A1_2O_3显示双性,当碱度较高时它属于酸性,因此可以分子比例与SiO_2相加;反之,当碱度较低时它属于碱性,因此须从SiO_2中扣去。如将MgO以重量百分率与CaO相加,这个碱度公式也可以适用于四元系。由于新的碱度公式所根...

在本文中,作者综合分析了关于CaO—SiO_2、CaO—SiO_2—Al_2O_3及CaO—MgO—SiO_2—Al_2O_3系统熔渣中α_(SiO_2)及α_(CaO)的测定结果,并加以比较。关于CaO—SiO_2二元系,作者综合了Fulton与Chipman,张禄经与Derge及坂上六郎的实验数据,导出了1600℃时液态渣在整个浓度范围内的α_(SiO_2)及α_(CaO),分别用β鳞石英及固态CaO为标准状态。根据这样算出的α_(SiO_2)及α_(CaO)以及坂上的CaO侧电动势数据,作者导出了一个经验公式,可以用来从已知的电动势数据与α_(SiO_2)计算α_(CaO)。将这个公式应用于CaO—SiO_2—Al_2O_3三元系,算出了三元系熔渣内当Al_2O_3=10、20%时的α_(CaO)。然后将二元系和三元系中的α_(CaO)加以比较,导出了一个新的碱度计算公式。在此式中A1_2O_3显示双性,当碱度较高时它属于酸性,因此可以分子比例与SiO_2相加;反之,当碱度较低时它属于碱性,因此须从SiO_2中扣去。如将MgO以重量百分率与CaO相加,这个碱度公式也可以适用于四元系。由于新的碱度公式所根据的实验数据并不充分,所以它的能否适用须视应用结果如何而定。Taylor与Stobo由脱硫平衡数据计算了三个熔渣内的α_(CaO),与作者的计算结果不能符合。本文初步分析了造成这个差异的原因。因为这个差异的存在,本文所计算的α_(CaO)只能认为相对的数值,同时图2的α_(SiO_2)曲线也有待将来研究复证或修正。

In order to determine the workability of cast iron with spheroidal graphite,the following tests have been conducted on this material in the as-cast and annealed condition:tensile tests,compression tests,Charpy impact tests,impacttensile tests,twisting tests,upsetting tests under the drop hammer and small-scaledrolling tests.Results from these tests show that the best hot-working temperature rangeof this material varies somewhat with the stress system applied and the speed ofworking,and in general lies between...

In order to determine the workability of cast iron with spheroidal graphite,the following tests have been conducted on this material in the as-cast and annealed condition:tensile tests,compression tests,Charpy impact tests,impacttensile tests,twisting tests,upsetting tests under the drop hammer and small-scaledrolling tests.Results from these tests show that the best hot-working temperature rangeof this material varies somewhat with the stress system applied and the speed ofworking,and in general lies between 700° and 1100℃.Within this temperaturerange,the maximum amount of working permissible for a single working operationvaries considerably with the stress system applied.Under tensile stresses,thismaximum amount of working lies between 28 and 57.6%;under predominentlycompressive stresses,it lies between 58.5 and 72.9%;while in the small-scaledrolling tests,the maximum reduction in thickness permissible for a single passlies between 38.6 and 44.3%.The maximum amount of working permissible is alsoaffected by the speed of working,being greater at lower speeds.Tests on industrial scale show that the upsetting and small-scaled rollingtests give results nearest to those from industrial tests.Charpy impact tests,impacttensile tests,upsetting tests and small-scaled rolling tests show more prominentlythe best hot-working temperature range than the other tests conducted.Results of the present research also indicate that cast iron with spheroidal graphitehas a higher strength and workability when subjected to compressive stresses thanto tensile stresses,that a brittle temperature range has been recorded between200° and 650℃,which varies with the speed of test.Judging from the variationof the resistance to deformation with the change of temperature and the speedeffect,this phenomenon is associated with blue brittleness.

为了确定球墨铸铁的可塑性,曾进行了铸态和铸态经墨化热处理后的球墨铸铁在不同温度下的抗张试验、抗压试验、冲击弯曲试验、冲击抗张试验、撚扭试验、顶锻试验和小型压延试验庑┦匝橹赋?球墨铸铁的最好热加工温度范围随着应力体系和加工速度的不同而略有不同,但一般介于700℃和1100℃之间。在此温度范围内球墨铸铁能够耐受的最大加工量依所受的应力体系而有相当大的差別。在张应力作用下,此最大加工量介于28—57.6%之间,在主要为压应力作用下,介于58.5—72.9%之间;在小型压延试验中,其最大加工量则介于38.6—44.3%之间。最大加工量亦受速度的影响:实验室的试验指出,球墨铸铁在比较低速下加工有较高的塑性。在比较接近生产的条件下的试验结果指出:顶锻试验和小型压延试验给予最靠近生产试验结果的数值。冲击弯曲、冲击抗张、顶锻试验和小型压延试验给予比较明确的最好热加工温度范围,其他试验则不能给予很明确的结果。如果采用了测压仪、小型压延试验,还可以提供变形阻力的资料。试验结果指出:球墨铸铁在压应力作用下比在张应力作用下有较大的强度和塑性;其中温变脆温度依试验速度的变化而在200°—650℃之间变化,根据变形阻力和变...

为了确定球墨铸铁的可塑性,曾进行了铸态和铸态经墨化热处理后的球墨铸铁在不同温度下的抗张试验、抗压试验、冲击弯曲试验、冲击抗张试验、撚扭试验、顶锻试验和小型压延试验庑┦匝橹赋?球墨铸铁的最好热加工温度范围随着应力体系和加工速度的不同而略有不同,但一般介于700℃和1100℃之间。在此温度范围内球墨铸铁能够耐受的最大加工量依所受的应力体系而有相当大的差別。在张应力作用下,此最大加工量介于28—57.6%之间,在主要为压应力作用下,介于58.5—72.9%之间;在小型压延试验中,其最大加工量则介于38.6—44.3%之间。最大加工量亦受速度的影响:实验室的试验指出,球墨铸铁在比较低速下加工有较高的塑性。在比较接近生产的条件下的试验结果指出:顶锻试验和小型压延试验给予最靠近生产试验结果的数值。冲击弯曲、冲击抗张、顶锻试验和小型压延试验给予比较明确的最好热加工温度范围,其他试验则不能给予很明确的结果。如果采用了测压仪、小型压延试验,还可以提供变形阻力的资料。试验结果指出:球墨铸铁在压应力作用下比在张应力作用下有较大的强度和塑性;其中温变脆温度依试验速度的变化而在200°—650℃之间变化,根据变形阻力和变脆温度范围的变化可以比较肯定地认为这是一种蓝脆的现象。

 
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