多介质可压缩流体动力学界面捕捉方法

研究多介质流界面捕捉方法的主要目的是消除多介质流体在界面处压力、速度可能出现的非物理振荡现象 ,并通过流体动力学方程和界面捕捉方程的耦合 ,将多介质流体动力学计算形式上转化为单介质流体计算 ,从而可以采用对计算单介质有效的高精度计算方法来处理多介质流动问题。推广了Shyue界面捕捉和其等效方程的推导方法 ,给出的结果可以适用于具有状态方程 p =( ,e,a1 , ,an) +( ,e,b1 , ,bn)e的介质 ,并通过了数值试验验证。     

周期结构动力响应的高效数值方法

提出一种计算周期结构动力响应的高效率算法. 以精细积分方法为基础, 利用周期结构的对称性和动力问题的物理特性, 分析了周期结构对应矩阵指数的特殊结构, 并基于此给出一种计算周期结构对应矩阵指数的高效率方法. 在高效和精确计算周期结构对应矩阵指数的基础上, 得到了周期结构动力响应的高效率和高精度算法. 数值算例表明, 该方法效率高且节省存储要求.      

使决策单元变为DEA有效的偏差和最小法

某决策单元为非 DEA有效 ( C2 R或 C2 GS2 ) ,为了将它变为 DEA有效 ,在找出其对应点附近的一些有效前沿面的基础上 ,给出了使其对应点与这些有效前沿面上的点的输入、输出的偏差和最小的方法 .     

煤催化气化的修正缩核反应模型研究

针对煤的催化气化反应中以往的动力学模型不再适用这一情况，以气固非催化缩核反应动力学模型为基础，考虑了催化剂对反应的作用，并将催化剂的影响因素用一个催化有效因子函数来表达，该函数包括催化剂的催化能力、加入量以及滞留效应等；建立了适合于煤催化气化反应的修正缩核反应动力学模型．结果表明，在模型适用范围内模型模拟值与实验结果吻合良好，误差在l.4％以内．     

浅谈机械化施工中机械设备的选择与组合

本文就在机械化施工中，对主要工程机械，如装载机、推土机、铲运机、自卸汽车的选择组合和计算方法进行了分析，并概括地指出了在机械设备选择和组合时应注意的事项。     

低碳钢高效TIG焊的活性剂研制

针对低碳钢研制了由卤化物，ＳｉＯ２ 和 Ｃｒ２Ｏ３等组成的高效 ＴＩＧ 焊活性剂，分析了各单一活性剂对焊接熔深的影响规律，并利用正交试验法对多组元配方进行了研究，得出了各组元的质量分数变化对焊接溶深的影响规律．所得到的配方可使焊接溶深增加３倍，并可以将１２ ｍｍ厚的低碳钢钢板对接一次焊透。     

非正定方差阵下的证券组合投资模型研究

研究了非正定方差阵下,证券组合投资模型的最优投资比例系数的计算,有效边界,冗余证券的数量以及套利机会.从而为实证分析提供了理论依据和方法.     

论翻译选择的目的性——胡适翻译研究

本文以目的论为理论基础，从翻译选择的目的性角度对胡适翻译行为作一个描述性而非规定性的研究。本文通过对胡适诗歌、短篇小说翻译过程中各种层面选择的详细分析，指出针对翻译行为的一切选择无不有其内在的目的性。作者试图从一个崭新的角度探究胡适对翻译的贡献以及他做出的种种选择与翻译目的的关系。     

Ways to Achieve Sustainable Development for the Steel Enterprises

Sustainable development strategy is the only choice for steel companies in China. Starting with environment protection, energysaving and integrated resource utilization, supported by technology advancement and environmental investment, sustainable development strategy can be implemented to drive the circular economy. Thereby, the responsibility to realize the long-term harmony and synergy between society and enterprises is taken by Baosteel.     

Artificial antenna systems

The work describes experimental and theoretical results on the water oxidation in absence of an externally added potential, on the charge transport in organized microporous media and on the transport of excitation energy in an antenna system. Water oxidation to O₂ takes place at the solid/water phase boundary of a thin AgCl layer in the presence of a small excess of Ag⁺. This water oxidation step shows self-sensitization as the reaction proceeds, the sensitivity is extended from the near-UV-visible towards the red range. The quantum yield per redox equivalent for O₂ evolution upon illumination with near UV light (340–390 nm) is ∼ 0·8 and it is the same upon illumination with blue light (420–480 nm). In the green range it is ∼ 0·5. We discuss parameters controlling these reactions. Zeolite microcrystals are investigated as hosts for supramolecular organization of clusters, complexes and molecules. The possibility to arrange zeolite microcrystals of good quality and narrow size distribution as dense monograin layers on different types of substrates allows the discovery of specific properties. In the present context, three functionalities are of special importance intrazeolite ion transport, intrazeolite charge transport and intrazeolite excitation energy transport. All of them have been clearly demonstrated experimentally although there are still some controversies going on. Highly concentrated dyes have the tendency to form aggregates which generally show very fast radiationless decay. In natural antenna systems the formation of aggregates is prevented by fencing the chlorophyll molecules in polypeptide cages. A similar approach is possible by enclosing dyes inside a microporous material such that the volume of the cages and channels is able to uptake monomers only, but not aggregates. We know a number of materials bearing linear channels running through the whole microcrystal which allow the formation of highly anisotropic, monomeric dye assemblies. A few cases based on zeolite L as a host and the cationic dye molecules pyronine and oxonine have been investigated experimentally to some extent for this purpose. While the molecules can penetrate the channels, the geometrical constraints of this system excludes aggregation and therefore self-quenching up to very high concentrations, namely 0·2 M. Microcrystals with cylinder morphology and a size in the range of 100 nm have been found to be optimal for realizing collection efficiencies in order of 99%.