非线性理论处理方法概论

简要介绍了几种被广泛应用的非线性方法：（１）非线性方法在相交物探信息闭合中的应用;（２）非线性Ｒａｄｏｎ变换在波场分离中的应用;（３）非线性Ｋ－Ｌ滤波在提高地震资料信噪比中的应用;（４）非线性方法在剩余静校正中的应用;（５）利用三阶弹性常数建立非线性波场方程。通过对照可以明显看出,通常情况下非线性方法的效果要比线性方法的效果好一些,也就是说非线性方法具有线性方法没有的许多优点。     

垃圾土室内动力试验研究

利用循环三轴试验对城市垃圾土的动力特性进行了研究。试验中对试样分别施加两种不同荷载,一种为循环压缩,另一种为循环压缩和伸长荷载,分别模拟交通荷载和地震荷载情况,循环荷载频率为1Hz。对城市垃圾土的动模量和振动残余应变试验结果进行了分析,并给出了计算公式。     

评康熙帝的大气物理知识

清弱帝玄烨曾对大气物理学中的大气光象、声象、电象发表过一些通过产地考察的经验性看法,有的还很有意义。本文对此加以评述。     

杭州湾、长江口余流及其物质输运作用的模拟研究Ⅱ冬季余流及其对物质的运输作用

首先分析了杭州湾、长江口冬季余流和物质输运作用的观测特征,提出了几个值得继续研究的问题．然后,利用杭州湾、长江口三维联合模型,综合考虑径流、风应力、密度流、中国东部海域背景环流和Ｍ２,Ｓ２,Ｋ１,Ｏ１四个分潮的综合作用,模拟出了冬季的余流结构及其对物质的输运作用．在此基础上,针对所总结的几个问题,进一步作数值模拟,讨论余流和物质输运作用形成的机制。     

地震层速度在盆地分析中的应用

讨论了地震层速度在喾盆地分析中的应用,论述了速度分析的基本原理,介绍了用相对 剩余层速度进行碉性分析的方法,通过实例说明了速度分析的应用效果。指出层速度剖面图能明显地反映构造现象,层速度平面图能可靠地用于盆地构造分析,相对剩余层速度平面图能有效地预测岩性的变化,为沉积相和沉积体系分析提供可靠的依据。     

某宿舍楼滑坡机理分析与治理

详细分析了某边坡失稳的机理,并对滑坡的稳定性及其发展趋势进行了科学分析和预计。在此基础上,提出了以抗滑桩为主,辅以灌浆、排水和护面等综合治理设计方案。为提高计算结果的可靠度,采用了滑带土的残余抗剪强度指标和双参数法等手段。     

Tokamak residual zonal flow level in near-separatrix region

Residual zonal flow level is calculated for tokamak plasmas in the near-separatrix region of a diverted tokamak. A recently developed method is used to construct an analytic divertor tokamak configuration. It is shown that the residual zonal flow level becomes smaller but still keeps finite near the separatrix because the neoclassical polarisation mostly due to the trapped particles goes larger in this region.     

基于余水位精化潮高模型的水位生成研究

研究了基于余水位精化潮高模型的水位生成方法。所提方法首先构建网格潮汐场模型,其次采用余水位提高内插模型精度。通过网格搜索策略实现了水深点所属网格的快速定位及水位生成,探索了该模型在水位改正及预报中的应用。实验表明：所提方法既可应用于水位改正又可用于水位预报,且较现有方法在精度上有所提高。     

地震成像道集域的变周期预测反褶积

针对残余多次波的识别与压制问题,提出了1种应用于成像道集域的变周期预测反褶积方法.与传统的预测反褶积方法不同,该方法首先根据所建立的强波阻抗界面的深度-速度模型,在地震偏移剖面上追踪识别出残余多次波,并根据其传播时间确定出相应变化的多次波周期或预测步长,然后在成像道集上对含有残余多次波的成像道进行变周期预测反褶积压制处理,最后再将剔除残余多次波后的成像道集合成为新的地震偏移剖面.实验处理的结果表明:该方法不仅对微屈多次波有效.而且对残余的长周期鸣震多次波也可达到令人满意的压制效果.     

Residual and tidal circulation revealed by VHF radar surface current measurements in the southern Channel Isles region (English Channel)

Two very high-frequency radars (VHFRs), operating in the southern Channel Isles region (English Channel) in February–March 2003, provided a continuous 27-day long dataset of surface currents at 2 km resolution over an area extending approximately 20 km offshore. The tidal range in the region of study is one of the highest in the world and the coastal circulation is completely dominated by tides. The radar data resolve two modes which account for 97% of the variability of the surface current velocities, with the major contribution of the first mode. This mode accounts for oscillating tidal currents whereas the second mode represents motions emerging from the interaction of tidal currents with capes and islands (eddy in the vicinity of the Point of Grouin and jet south of Chausey). A fortnightly modulation of the modal amplitudes causes the exceptional (more than 600%) variability of currents which is well captured by the VHFR observations. The radar data revealed that tidal circulation in the region is flood-dominated with a strong asymmetry of current velocity curve. Wind events and fortnightly variability affect the course of tidal cycle by modifying the magnitude and duration of ebb and flood. In addition to expected features of coastal circulation (tidally dominated flow, eddies) and high wind-current coupling, the residual currents revealed a strong cross-shore structure in the mean and a significant variability which has the same order of magnitude.