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     The authors compare the partition testing and the random testing under different assumption (Certainty and Uncertainty models).
     对划分测试和随机测试在不同的假设模型下(确定模型和不确定模型)进行比较并得出以下结论:在确定失败率的假设下,随机测试优于划分测试;
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     At the same time, with the dynamic Web application system developing technologies such as ASP and COM, a Web application system based on threc-ticr architecture is implemented, which conquers the obturation of the conventional system based on C/S model.
     同时,利用ASP和COM组件对象模型相结合的动态Web应用系统开发技术,实现了基于Browser/Server三层体系结构并与COM(组件对象模型)技术相结合的智能性Web应用系统,克服了传统C/S模式的知识应用系统封闭和半封闭的缺点。
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     ISO RM-ODP(ISO Reference Model for Open Distributed Processing) provides framework for open and flexible distributed system.
     ISO RM-ODP(ISO开放分布式处理参考模型)为开放、灵活的分布式系统提供了主框架。
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     The two equations of turbulence model(the к - ε model) are introduced to the computational model.
     计算模型中,引入了二方程湍流模型(即κ-ε模型)
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     The models of coal pyrolysis are reviewed and some recently developed network models are introduced and compared with each other,which include FG DVC model,FLASHCHAIN model and CPD model.
     介绍了各种热解模型,并对最近发展起来的各种网络模型(FG-DVC模型、FLASHCHAIN模型、CPD模型)进行了较全面的比较。
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     This improved mixing dielectric model yields an excellent fit to measured data.
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Reductive group actions on affine quadrics with 1-dimensional quotient: Linearization when a linear model exists
      
A linear model for a given action is a linear orthogonal action with the same orbit types and equivalent slice representations.
      
We prove that if a reductive group action on an affine quadric with a 1-dimensional quotient has a linear model, then the action is linearizable.
      
Using the path model and the theory of crystals, we generalize the concept of patterns to arbitrary complex semi-simple algebraic groups.
      
In the model situationD is the Siegel disc,S is the manifold of Lagrangian subspaces andG is the symplectic group.
      
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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。

Internal friction peaks associated with the stress-induced diffusion of carbon were observed in four kinds of f.c.c. manganese steel which contain Mn 18.5%, Mn 25.4%, Mn 36.0% and Mn 9.5%, Ni 8%, Cr 3% respectively. The optimum internal friction occurs at a temperature around 250℃ when the frequency of vibration is about 2 cycles per second. Experimental results showed that the height of internal friction peak is linear with the carbon content in solid solution.

在三种面心立方系的铁锰合金(Mn18.5%,25.4%,36.0%)和铁锰镍铬合金(Mn9.5%,Ni8%,Cr3%)中观察到因含碳而引起的内耗峰,当振动频率约为2周/秒时,内耗峰出现在250℃左右。实验结果指出内耗峰高度与固溶体中的含碳量成直线关系。 提出了一个产生内耗峰的初步模型。假定碳在面心立方系晶体点阵中占据八面体的间隙位置,点阵中的异类原子(合金元素的原子或空穴)与这碳原子构成一个在各方向引起不同畸变的原子对,由于这个原子对在应力作用下的转动而产生内耗。由初步模型所推导出的式子可以解释内耗峰高度与固溶体中的含碳量成直线关系。根据粗略推算所得的内耗峰高度值与实验值相近。 关于晶体中空穴浓度的推算指出,对于碳在面心立方系合金钢中微扩散所引起的内耗峰而言,空穴的贡献少于合金元素的贡献的十分之一。

The change of the height of the carbon diffusion peak was observed during the process of decarburization of an α-iron specimen containing a small amount of carbon, and it was found that the height of the peak first decreases and then increases with time to a maximum value twice. This indicates that the carbon adsorbed in iron goes twice into solid solution during the process of decarburization. The first re-dissolving phenomenon occurs sooner and the amount of carbon involved is comparatively less than that...

The change of the height of the carbon diffusion peak was observed during the process of decarburization of an α-iron specimen containing a small amount of carbon, and it was found that the height of the peak first decreases and then increases with time to a maximum value twice. This indicates that the carbon adsorbed in iron goes twice into solid solution during the process of decarburization. The first re-dissolving phenomenon occurs sooner and the amount of carbon involved is comparatively less than that of the second re-dissolving phenomenon. On the basis of experiments on fine-grained and coarse-grained specimens, the conclusion was reached that the second re-dissolving phenomenon is resulted from the release of the carbon adsorbed at the grain boundary area, and that the first re-dissolving phenomenon is connected with the release of the adsorbed carbon in the interior of the grains.

观察了含有微量碳的α-Fe试样在去碳过程中碳扩散内耗峰的变化,发现了峰的高度在去碳过程中始而降低,但是继而升高,并两次达到最大值,这表示吸附于铁中的碳两次再溶于固溶体。第一次再溶发生在较短的去碳时间,再溶的碳量较少;第二次再溶发生在较长的去碳时间,再溶的碳量较多。根据细晶粒和粗晶粒试样的实验结果,认为第二次再溶现象是由于吸附在晶粒间界地区的碳原子放出来的结果,第一次再溶现象则与晶粒内部的吸附有关。 根据晶粒间界空穴模型讨论了碳在晶粒间界地区吸附的情况。此外并初步认为碳在晶粒内部的吸附是由于碳原子填入晶粒内部所含的晶体缺陷。

 
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