Algebraic turbulent energy flux models for hypersonic shear flows

Algebraic truncation models were derived for the turbulent energy flux for high-speed shear flows with and without thermal and mechanical non-equilibrium effects. To facilitate closure, fluctuating dilatation moments were modeled via conservation of mass truncations and the inhomogeneous terms were neglected. The resulting energy flux model provided significant improvements, up to 20%, in the temperature predictions over the gradient diffusion model for equilibrium flows over a Mach number range of 0.02–11.8. Our experiments showed that vibrational relaxation significantly altered the basic decay rate of grid turbulence. Also, our models indicated that compressibility introduces an explicit pressure gradient dependency. Analyses of a governing parameter indicated that these terms are negligibly small for low speeds, but may be important, or even dominant, for high-speed flows.     

UK space policy — a problem of culture

According to the UK government, the announcement in July 1987 of a freeze on the British National Space Centre's (BNSC) budget was based solely on lack of money and the belief that private industry, rather than the state, should fund space activities. In challenging the validity of this view, the author suggests that it has also been used to conceal internal bureaucratic competition and a myopic, market-driven mind-set.     

摄影技术基础课程教学实践浅析

本文分析了我院开设摄影技术基础课程的背景，初步研究探讨了摄影课在本院的教学情况，指出摄影教学在我国大力提倡素质教育的今天，大有可为。我院现时大规模发展的同时，加强摄影教学具有现实意义。     

如何使大学英语课堂更具吸引力

本文探讨了学生上英语课的动机，教师在课堂教学中究竟起到什么作用。以及如何根据学生的要求，教师来充分展示英语课堂的魅力，使它富于变化，充满活力，把更多的学生吸引到课堂上来，改善学生的出勤率。     

新时期如何改进和加强思想政治教育工作初探

本文主要就在市场经济条件下如何改进和加强思想政治教育工作、提高其针对性和实效性问题进行了探索，阐述了要根据时代特点构建其内容体系，根据教育对象的不同有区别地开展思想政治工作，以及要不断地创新思想政治工作的方式、途径和载体等观点。     

高职学校教学质量保障系统与教学评价体系研究

本文通过对教学质量的再认识,分析了当前影响高校教学质量的因素,构建了高校教学质量保障系统,制定了高职教学评价指标体系。     

类比法在材料力学教学中的运用

类比法是材料力学中颇具探索性和创造性的一种思维方法。在材料力学教学中运用类比法，不仅符合课程特点，而且有助于激发学生的创新意识。本文就在材料力学教学中如何运用类比法试作初步探讨。