钼丝弯折断裂的探讨

无论是加工态还是各种温度退火后，直至完全再结晶的纯钼丝和高温钼丝，在弯折变形的过程中，它的断裂都首先是从内侧开始的，并呈４５°角方向扩展。退火后的纯钼丝呈沿晶断裂，而高温钼丝呈穿晶断裂。     

气枪阵列远场子波模拟与应用

 在野外采集中考察气枪阵列的稳定性以及进行确定性子波反褶积，都要求能够获得气枪阵列的实时远场子波。目前海上地震勘探所用的气枪阵列均由单枪与相干枪组成，因此需要按照相干情况下远场子波合成原理，首先记录阵列单元（所有单枪与相干枪）上的近场子波，进而利用软件模拟计算远场子波。通过对气枪阵列每次激发的远场子波进行自相关或互相关处理，评估阵列的稳定性；在地震数据处理时，利用远场子波求取较为准确的反子波算子，进而实现确定性反褶积处理。文中用实例介绍了利用获得的远场子波进行气枪稳定性评估以及地震资料反褶积处理的效果。     

Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes

A three-wave interaction (3WI) code is developed to study the stimulated Raman scattering (SRS) in both absolute and convective regimes. In the simulations, the time and spatial evolutions of a plasma wave are described by temporal growth rate and spatial factor, respectively. The spatial factors in different phases and different instability regimes are investigated. It is found that the spatial factor is caused by the finite velocity of the pump wave in the first phase and by damping in the last phase. With inclusion of the spatial factor, the temporal growth rate decreases and the threshold for SRS for a finite frequency mismatch increases. Meanwhile, the effects of wave frequency mismatch on the temporal growth rate are also discussed.