用部分电离等离子体作表面处理

部分电离的等离子体在多种技术领域中被广泛地用来加工处理形形色色的表面。本文所述的表面处理是指在表面沉积薄膜,对表面进行刻蚀,以及通过氧化、氮化或纹理化使现有表面改性。这种处理常可得到其他手段达不到的很独特的效果。作为活性气体的等离子体自身氛围环境的复杂性再加上与等离子体装置有关的参量空间很大,给工艺的发展与优化带来了困难,可是也为新发现和新发明提供了种种机会。部分电离等离子体可对大面积的待处理表面提供高能离子和/或种种活性的中性原子或基团的均匀流,这种能力可望在表面处理工艺中找到不断扩展的用武之地。     

一种容积法测小流量研究

针对高压汽水两相流实验中小液量测量困难这一问题，运用重力压差主要由液相密度决定的原理，提出了由圆管内重力压差变化线性分求流量的方法，实验表明这一方法线性度很好，本文对这一方法进行了理论分析，得到了计算修正公式，同时评估了计算带来的误差。     

软岩流变的一种新的试验研究方法

 研制了用于软岩流变的蠕变-松弛耦合试验仪，探讨了利用单级 加载和逐级加载两种方式确定软岩流变参数和长期强度的蠕变-松弛耦 合试验原理. 有关的具体试验表明，该仪器操作简便, 稳定性好，所得 结果客观、可靠，可在工程中推广应用.     

The Perturbation Parameter in the Problem of Large Deflection of Clamped Circular Plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads,various perturbation parameters relating to load,deflection,slope of deflection,membrane force,etc.are studied.For a general perturbation parameter,the variational principle is used for the solution of such a problem.The applicable range of these perturbation parameters are studied in detail.In the case of uniformly loaded plate,perturbation parameter relating to central deflection seems to be the best among all others.The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems,including the large deflection problems under combine loads.     

角支及多点支承矩形板的弯曲

本文取两对边简支另两对边自由的板为初始解,用迭加法在两边简支板上迭代消去板边上的剪力。为了简化消去板边剪力的复杂迭代过程,作者提出了高精度的简化方法,将无限迭代简化为一次计算,将角支板的求解化为计算两个对边简支矩形板的简单问题。对于多点支承矩形板,则可取角点支承板为基本结构用力法求解。文中还提出了一些实用经验公式,列出了典型算例,验证了方法的适用性和高精度。     

TMD的个数对其减振效果的影响

本文从地面运动为水平简谐运动时结构引入多个TMD的运动方程出发，推导了其理论解，并在此基础上，假设各个TMD拥有相同的质量、频率和阻尼，分析了在总质量一定的前提下，TMD个数的变化对其减震效果的影响。并制作拱形主结构和TMD模型进行实验验证。实验结果也得出同样的结论；即总质量一定的前提下，如果各个TMD拥有相同的质量、频率和阻尼，则其个数的变化对其减震效果的影响不大。最后，根据实验模型编制有限元程序进行模拟计算，计算结果与实验结果比较吻合。     

液体调谐减振器的分析

本文利用Ｌａｍｂ变换，考虑液体的粘性，略去二维Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程中的非线性预后，建立了频域内Ｎａｖｉｅｒ－Ｓｔｏｋｒｅｓ方程的边界积分表达式，完整地处理了边界条件（包括自由面边界条件和固壁边界条件）并且给出了液体随结构振动时的附加质量与阻尼的计算表达式。     

Convective instability in a rapidly rotating fluid layer in the presence of a non-uniform magnetic field

Magnetoconvective instabilities in a rapidly rotating, electrically conducting fluid layer heated from below in the presence of a non-uniform, horizontal magnetic field are investigated. It was first shown by Chandrasekhar that an overall minimum of the Rayleigh number may be reached at the onset of magnetoconvection when a uniform basic magnetic field is imposed. In this paper, we show that the properties of instability can be quite different when a non-uniform basic magnetic field is applied. It is shown that there is an optimum value of the Elsasser number provided that the basic magnetic field is a monotonically decreasing or increasing function of the vertical coordinate. However, there exist no optimum values of the Elsasser number that can give rise to an overall minimum of the Rayleigh number at the onset of magnetoconvection if the imposed basic magnetic field has an inflexion point. The project supported by the National Natural Science Foundation of China (40174026 and 40074041)