浅论宜兴紫砂壶术语的英译

宜兴紫砂壶在中国,乃至世界上都有着自己独特的地位。宜兴的一些紫砂壶术语也与众不同,本文以宜兴紫砂壶为例,分析了该领域英译的主要特点和难点,对其中术语的翻译进行了一些初探．并指出作为这个领域的合格译员必须牢固掌握传统紫砂文化和制壶工艺两方面的知识,从而避免误译。     

求解非平底一维浅水方程的 KFVS 格式

以Boltzmann方程为基础，本文提出了求解非平底浅水方程的KFVS（Kinetic Flux Vector Splitting)格式。因通量计算中考虑了底坡项的作用，计算方法和谐，即在非平底静水计算中始终能保持流速为零，水位为常数。数值试验表明，无论是计算恒定流还是非恒定流，该方法具有健全性和高分辨率等特点。     

Higher-order crack-tip creep stress fields in materials under biaxial loading

We have developed and implemented a method for calculating the fields of parameters of the crack-tip creep stress-strain state by taking direct account of the higher-order terms. The paper presents some calculated data on the fields of crack-tip stresses, creep strain rates, and amplitude ratios in the creep case. The influence of loading biaxiality on redistribution of stresses between the creep stages and on the constraint parameters in failure is assessed. Translated from Problemy Prochnosti, No. 6, pp. 25–43, November–December, 2008.     

Image processing for time-frequency speech analysis

Classic notion of spectral analysis is based on stationary hypothesis. But, stationary signals constitute only an exception when we consider the immense majority of real signals found in nature. Time-frequency representations and particularly those derived from the Wigner–Ville transformation is well adapted to non-stationary signal analysis. However, the resulting unwanted cross terms, in the time-frequency plane, make it very difficult for anyone to draw straightforward conclusions. Attenuation of these terms requires a smoothing depends on the kernel choice characterizing the representations which have various properties and performances. These properties are still not very known. In order to bypass this problem, image processing techniques are applied to the time-frequency representations. The method is based on image binarisation which separates the object from the background. The application to speech signal as a non stationary signal and a communication tool, to locate the mains frequencies of the French vowels has given very satisfactory results.     

Extension of WAF Type Methods to Non-Homogeneous Shallow Water Equations with Pollutant

This paper deals with the extension of the WAF method to discretize Shallow Water Equations with pollutants. We consider two different versions of the WAF method, by approximating the intermediate waves using the flux of HLL or the direct approach of HLLC solver. It is seen that both versions can be written under the same form with different definitions for the approximation of the velocity waves. We also propose an extension of the method to non-homogeneous systems. In the case of homogeneous systems it is seen that we can rewrite the third component of the numerical flux in terms of an intermediate wave speed approximation. We conclude that—in order to have the same relation for non-homogeneous systems—the approximation of the intermediate wave speed must be modified. The proposed extension of the WAF method preserves all stationary solutions, up to second order accuracy, and water at rest in an exact way, even with arbitrary pollutant concentration. Finally, we perform several numerical tests, by comparing it with HLLC solver, reference solutions and analytical solutions.