层状粘弹性介质中SH波的反射、透射问题

处理粘弹性介质有两种方法,一种是在运动方程中加入介质的粘滞性因素,另一种是从本构方程入手,建立介质的粘弹性模型。后一种方法在研究介质物理性质上具有直接性,是目前使用较为普遍的处理方法。从本构方程的角度,以波尔兹曼(Bo ltzm ann)叠加原理为基础,建立积分型本构方程,进而建立粘弹性介质波动方程,得到二维粘弹性平面波解,并研究了层状粘弹性介质分界面处平面波的反射、透射问题,计算反射、透射系数CR、CT,同时进行了一定的理论分析。     

中值滤波技术在遥感图像处理中的应用

利用中值滤波技术能够很好的抑制噪声和保护边缘信息这一特性,用不同的滤波窗口对遥感图像进行处理,并做出处理后图像的归一化差值图像。通过图形分析发现差值图像上的信息比原始图像细节信息更丰富,某些地质现象更清晰。     

额济纳233年来胡杨树轮年表的建立 及其所记录的气象、水文变化*

通过胡杨树轮宽度的分析,建立了内蒙古额济纳地区过去233年来的STD,RES和ARS年表;并将树轮STD年表与采样点附近额济纳气象站的气温、降雨量以及狼心山水文站的地下水水位等记录进行了相关分析。结果表明,在额济纳地区显著影响该地胡杨生长的主要限制因子是地下水水位。胡杨树轮宽度年表与冬季及全年地下水水位相关性最高,分别为-0.808(p＜0.01)和-0.724(p＜0.05)。在此基础上,设计转换方程,重建了额济纳地区过去232年来冬季及全年地下水水位变化历史,冬季地下水水位重建方程的解释方差达76.3 % (调整自由度后为70.4 ％ ,n=11,r=0.874,F=12.881,p＜0.003),全年地下水水位重建方程的解释方差为72.8 ％ (调整自由度后为66.1 ％ ,n=11, r=0.854,F=10.731,p＜0.005)。     

Application of Unscented Kalman Filter in Satellite Orbit Simulation

IntroductionAs is well known,the Kal manfilter(KF) is al-ways usedto deal withthe system whose dynam-ics and observation models are linear , and theextended Kal manfilter(EKF) is the most widelyused esti mator for nonlinear systems . In theEKFthe kal man …     

Torsional response of pile embedded in a poroelastic medium

The response of a cylindrical elastic pile embedded in a homogeneous poroelastic medium and subjected to torsional loading is studied for the first time. Based on the Muki's model, the pile-porous medium system is decomposed into a fictitious pile system and an extended porous medium system. The one-dimensional, vertical, elastic pile and the three-dimensional poroelastic medium are solved, respectively. Considering the mixed boundary-value conditions at the interface of pile and soil, a Fredholm's integral equation of the second kind for the bar-force is established. The force and the displacement of the pile are calculated by applying numerical quadrature.     

The Contemporary Tectonic Strain Rate Field of Continental China Predicted from GPS Measurements and its Geodynamic Implications

In Appling studies, the strain rate in China has been computed from using different methods, resulting in quite different estimates of the strain rate the geo-statistics from GPS velocity field of Chinese continent, we obtain the velocity value at each little regularly spaced grid point, by kriging interpolation and the component of strain rate for each volume element, using a method similar to the derivation of shape functions in the finite element algorithm. Therefore the distribution of the strain rate field in whole for the Chinese continent is presented. The result shows that the orientations of principal strain rates are consistent with those of the P and T axes of focal mechanisms. The distribution of maximum shear strain rate clearly delineates some major active fault zones surrounding the Tibetan Plateau. The maximum shear strain rate is comparable with that obtained from analysis of seismic moment release. In part of the Tibetan Plateau containing normal faults and pull-apart grabens, we obtain an extensional state of strain. The absolute value of the strain rate in West China is approximately 5 times larger than that of East China, and the pattern of the strain rate field in most of the Chinese continent is controlled by the India/Eurasia collision.     

大庆长垣反转构造样式及其识别方法

大庆长垣位于松辽盆地中部坳陷区,其内部的反转构造主要分为断层控制型和非断层控制型。探讨了伸展构造体系中反转构造的识别方法,同时分析了反转构造与油气聚集的关系,对今后找寻油气藏具有指导意义。     

钢筋混凝土框架中震可修标准及简化抗震设计方法

本文对国际上主要建筑抗震设计规范中钢筋混凝土框架可修水准的层间位移角限值进行了比较,讨论了国内的一些相关研究结果,结合中国抗震规范确定钢筋混凝土框架中震可修层间位移角限值和屋顶侧移率限值分别为1/150和1/200。采用安全系数的抗震设计表达、论述了对应于结构层间位移角基于承载力的简化抗震设计方法。最后用实例按反应谱分析和弹性时程分析验证了钢筋混凝土框架中震可修层间位移角限值的有效控制作用,初步确定了简化抗震设计方法中梁柱构件的抗震安全系数并分析了提高目前结构抗震安全度的措施。     

震电效应理论及其研究进展

近些年来有关震电效应的研究方兴未艾，在天然地震预报、工程勘察及石油勘探领域的应用潜力是促使国内外学者投入大量精力从事该项研究的主要动力.然而，有关震电勘探方法的研究尚处于理论探索和实验模拟阶段，还未在实际生产中得到应用.文中以震电勘探方法理论作为出发点，对产生震电效应的主要机理进行了详细分析，总结了国内外在相关领域的研究进展情况，对震电勘探方法的未来发展方向作一展望.