粘弹性介质地震复合波变焦分离与波场外推技术

从粘弹性波动方程出发，建立了一种地震散射波场纵横向高分辨波场外推方法．这一方法有别于当前完全弹性介质三大波场外推方法（即有限差法、克希霍夫法和Ｆ－Ｋ法）；同时，与Ｎ．Ｂｌｅｉｓｔｅｉｎ和Ｊ．Ｋ．Ｃｏｂｅｎ成像方法也不同，它对积分方程无需作线性化近似而进行反演，具有较大的适应性，能改善地震资料纵横向分辨率．此外，作者还通过实例对该理论推断予以验证．     

Ultrasonic Vibration Electrical Discharge Machining in Gas

A new method of ultrasonic vibration electrical discharge machining(UEDM) in gas is proposed in this paper. In UEDM in gas, the gap between tool electrode and workpiece is small(about 0.01mm), and the voltage between them is higher than EDM in liquid, so short circuit is easy to take place. It is very important for improving the MRR to avoid short circuit. Therefore, some measures have been taken, a rotation and a planetary motion are superimposed upon the tool electrode. During UEDM in gas, workpiece is vi...     

A submillimeter observation and study of star-forming regions

Using the 3-m radio telescope of KOSMA, we mapped ¹²CO (J = 3-2) lines for three molecular clouds, B35, S146 and TMC-2A. High-velocity molecular outflows are found in all these regions. The physical and dynamical parameters of the outflows are derived, and their shapes and driving sources are analyzed. Contour maps of center velocities show that the large scale systematic gradients exist in the three clouds. These observed motions are best explained by rotation after excluding the cause of outflows. Furthermore, in the core region of TMC-2A there is a velocity gradient in opposite direction from that of the large scale. It may be caused by magnetic braking. Finally, angular velocities of the clouds are calculated, and the effects of rotation against gravity and lowering the star-formation rate are also analyzed.     

粘土矿物在多孔介质中的运移及水中化学物质对它的影响

本文讨论了不同粘土矿物性质及颗粒大小对其运移的影响,并探讨了不同化学物质对粘土膨胀性的影响及其机理,得出阳离子半径越大所产生的电场场强越大,对稳定蒙脱土有利,阳离子半径小、电荷多,对稳定高岭土有利,空间几何作用对粘土矿物稳定也有一定的影响。小颗粒粘土比大颗粒粘土所造成的堵塞严重,粘土在特定条件下有可能提高注水的波及系数。     

位于异性异厚介质中的单层褶皱理论

讨论了位于异性异厚介质中单层褶皱变形的情况。运用受力分析，建立了力平衡方程；通过刚性边界映象原理、艾里应力函数及平面应力和应变的关系，求得平衡方程中的弹性常数，从而获得了该边界条件下的主波长理论，并运用模拟实验予以验证。这一理论对寻找和勘探符合该边界条件的矿层等具有重要的理论意义和实用价值。     

载荷形状对阻尼介质中圆柱壳塑性动力响应的影响

本文分析了在阻尼介质中当保持相关参量相同时，脉冲载荷形状对简支刚塑性圆柱壳的最终塑性变形的影响。分析表明：在阻尼介质中，相关参量的概念仍然可以沿用，但结构的最终塑性变形与相关参量的关系式Ｗ＿（ｏｆ）＝Ｉ·Ｇ（Ｐ＿ｅ）不再适用，应由更一般的表达式Ｗ＿（ｏｆ）＝Ｉ·Ｇ（Ｐ＿ｅ，β）来代替。     

粘弹性越流含水层组三维渗流模型的数值解

根据含水层（组）土骨架抽水压密与回灌膨胀力学机制的线性粘弹性应力－应变本构律，建立了关于粘弹性越流含水层组三维渗流模型，应用有限元法及有限差分法求解，得到了该模型的数值解，并应用于工程实践。     

脱硫弧菌的分离研究

报道了脱硫弧菌（Ｄｅｓｕｌｆｏｖｉｂｒｉｏｄｅｓｕｌｆｕｒｉｃａｎｓ）的分离研究情况。应用Ｂａａｒｓ，Ｓｔａｒｋｅｙ和改良的Ｍｉｌｌｅｒ氏培养基，从９种土壤和污泥中分离出了脱硫弧菌，并对其生理生化特性作了一定研究和探讨。这些研究结果有助于进一步对管道细菌腐蚀机理的了解和认识。     

声波在固体-多孔媒质界面上的反射和折射

本文介绍了流体饱和的多孔媒质中声波传播特性,较详细地讨论了声波从各向同性固体入射到多孔媒质界面时反射波、折射波势函数与入射波势函数的振幅比,计算了各种波所携带的声功率在入射波声功率中所占比例.本文的数值计算虽然限於高频,但所提出的方法可应用於任何频率的声波.