爆炸力学实验技术新进展

本文综述了爆炸力学实验和测试技术的最新进展。      

A Note on Factoring of Positive Definite Functions on Semigroups

The problem of characterizing those semigroups of class ℳ︁ such that every positive definite function factors via the greatest C ‐separative ∗︁‐homomorphic image is shown to be equivalent to several other problems, including that of characterizing flat semigroups. If the latter could be solved then the problem of characterizing perfect semigroups would be reduced to characterizing quasi‐perfect semigroups.     

一类非线性奇异微分方程正解的存在性定理

设(i) f(t,u): (0,1)×(0,+∞)→[0,+∞)连续，关于u 单调增加; (ii) 存在函数g:[1,+∞)→(0,+∞),g(b)0,G(t,s)是相应问题的Green函数。     

烯烃在Ag柱上顶替置换色谱机理的研究

选择环己烯、苯或甲基叔丁基醚（ＭＴＢＥ）作为高效液相色谱法（ＨＰＬＣ）流动相改性剂、正己烷为流动相时,吸附在银型磺酸键合硅胶固定相上的烯烃与流动相改性剂之间存在顶替置换作用,即烯烃的容量因子ｋ＇的对数与改性剂浓度［Ｂｍ］的对数间有很好的线性关系。由关联直线的斜率ｐ可获得烯烃置换改性剂的计量关系。但在不同流动相体系下,顶替置换过程不尽相同。在流动相改性剂浓度低于一定值时,内烯烃混合物与α－烯烃混合物都能与饱和烃分离并以不同的ｋ＇流出,各自ｌｇｋ＇值与ｌｇ［Ｂｍ］值之间也有线性关系。     

Influence of Basicity on the Formation of Cluster Ions/Adduct Ions for Organic Ammonium Halides by Positive Secondary Ion Mass Spectrometry

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A modified Hellinger-Reissner variational functional including only two independent variables for large displacement of thin shallow shell

I.IntroductionThemathematicalbasisofthefiniteelementmethodisthevariationalprinciple,andthedevelopmentofthefiniteelementmethodimpelsthevariationalprincipleitselftogetanewdevelopment.ThevariationalprincipIepresentedbyT.H.H.PianandP.Tongistheonethatthecontin…     

锆钴氢化物中氢氘的互排代研究

研究了一维排代条件下,ZrCo-H体系上气固间氢氘的互相排代特性。实验结果表明,氢氘间可以互相排代,影响排代效果的主要因素有:固相表面积、温度和气相流速。在粉化较好的ZrCo颗粒(≥48目)和较高的温度下(～85℃),气相流速提高到1.3NL/cm2min还具有较理想的排代效果。氘丰度的流出曲线可以用塔板理论描述,且具有较小的塔板高度     

有限元法分析空心后向反射器面形精度

为了探索空心后向反射器在工作状态下光学特性的变化 ,通过运用有限元法和在DEC/ 5 0 0 0工作站上采用MSC/NASTRAN程序 ,研究了用三种不同性能材料制成的空心后向反射器在不同几何尺寸和不同支承点位置时 ,载荷与温度梯度对空心后向反射器面形精度的影响。分别得出了反射器工作面变形与载荷大小、材料性能、支承点位置、温度梯度的关系曲线。这些曲线表明 :在确定条件下的反射器有一最佳的支承点位置 ;材料性能中的弹性模量对面形精度的影响最为显著 ;面形精度与载荷大小、温度梯度基本上成线性关系 ,但温度梯度是影响面形精度诸因素中的主要因素     

应用激光和CCD的远程位移检测实验研究

研究了利用线阵CCD对远程位移激光检测的方法 ,设计了光路、信号处理电路 ,并通过实验验证了该方法的可行性。该检测手段成本相对较低 ,具有自动、连续在线检测 ,非接触 ,精度高的特点。     

Efficiency of Capillary Imbibition Dominated Displacement of Nonwetting Phase by Wetting Phase in Fractured Porous Media

The critical and optimum injection rates as well as the critical fracture capillary number for an efficient displacement process are determined based on the experimental and numerical modeling of the displacement of nonwetting phase (oil) by wetting phase (water) in fractured porous media. The efficiency of the process is defined in terms of the nonwetting phase displaced from the system per amount of wetting phase injected and per time. Also, the effects of injection rate on capillary imbibition transfer dominated two-phase flow in fractured porous media are clarified by visualizing the experiments. The results reveal that as the injection rate is increased, fracture pattern begins to become an effective parameter on the matrix saturation distribution. As the rate is lowered, however, the system begins to behave like a homogeneous system showing a frontal displacement regardless the fracture configuration.