Effect of Overpressure on Rock Frame and Its Implications for Overpressure Evolution

Overpressure is a hot topic in the study of sedimentary basins. It is important in generation,maturation migration,and accumulation of hydrocarbon,but the effects of overpressure on rock frame have not been investigated. In this study,experiments were carried out to study the effects of overpressure on rock frame structures using five core samples from the Junggar basin,Northwest China. The deformations and velocities for the samples were measured at different effective pressures related to non-equilibrium compaction and fluid expansion overpressure mechanisms. The results show that the effect of overpressure on rock frames gradually increases when the effective pressure drops down to a certain value (called critical pressure). Moreover,non-equilibrium compaction mechanism has more effects on rock frames than fluid expansion mechanism under the same effective pressure. Furthermore to study rock frame structural changes,we use Kuster and Toks?z's expressions to simulate the effective aspect ratios of inclusions α (penny shapes) for different effective pressures. The results show that the α decreases dramatically when the effective pressure decreases from the critical pressure. Changes of α can be interpreted as responses to the rock frame changes when grains conform one another by rotating and self-adjusting. However,different mechanisms of overpressure have different effects on rock frames. The rock frame can be affected more easily by overpressure in shallow regions generated by non-equilibrium compaction mechanism. Once this kind of rock frames are preserved after overpressure releases to a normal hydrostatic pressure,they can be identified by their specific rock frame characters. This method provides a new way to study overpressure release and fluid migration and accumulation.     

豫北地区地震活动性及其与区域地壳运动的关系

本根据地震地质和地震分布条带,把豫北地区从西至东分为弱,中,强三个区段。由于区域地壳深部主断裂和大震活动的牵动作用,是造成本地震活动的重要原因,因而从区域地壳块体活动背景上探讨了本区及邻近地区地震活动趋势,中还指出,豫北西部太行山区的林县－薄壁地震带,虽不具有强震构造背景,但小震年月频率多寡和震群活动,却能反映了大区域地壳应力场强弱,亦可作为判断区域性地震活动的指标。     

低周反复荷载作用下复合耗能支撑钢筋混凝土框架结构的抗震性能试验研究

本文介绍了三榀钢支撑钢筋混凝土框架结构（包括两榀复合耗能支撑框架、一榀普通支撑框架）在低周反复荷载作用下的试验结果。对复合耗能支撑框架结构在低周反复荷载作用下的工作性能（包括受力性能、破坏形态、滞回曲线、骨架曲线、延性和耗能能力等）进行了探讨,揭示了复合耗能支撑框架结构良好的抗震性能。     

GISVlog模型的设计与实现

本文以地理信息系统(GIS为基础,分析了地理信息系统沃客(GISVlog,)形成的两个背景——网络新技术提高GIS生命力和沃客(Vlog,Vedio log的缩写)为网络增值;分别论述了GISVlog形成对GIS发展和Vlog发展的意义;在普通GIS的系统功能结构和Vlog的系统功能结构的基础上构建GISVlog的框架结构并加以实现;论文最后展望了GISVlog的发展前景,提出GISVlog是网络搜索技术新的研究方向。     

基于波束控制的卫星导航接收机抗干扰算法研究

卫星导航接收机抗干扰技术是接收机设计的一项关键技术。在研究基于功率反演的空域自适应抗干扰算法基础上，提出了采用基于波束控制的抗干扰算法，并进行了仿真计算，结果表明：该算法明显提高了接收机抗干扰性能。     

干涉技术在天体测量中的应用

介绍了射电、光学和红外波段地面干涉的仪器以及近期的进展,如厘米波段的VLBA、EVLA、SKA等;毫米波段的ALMA、CARMA等;光学波段的Keck、VLTI/PRIMA,CHARA、MarkⅢ、NPOI、LBTI等.叙述了目前干涉技术在空间天体测量中应用的一些研究项目。如射电波段的VSOP、iARISE、RadioAstro;光学波段的HST/FGS、SIM PlanetQuest等.探讨了干涉技术在天体测量中的有关研究课题,并概述了其在我国的发展和应用情况.     

Three-dimensional liquid sloshing in a tank with baffles

A numerical model has been developed to study three-dimensional (3D) liquid sloshing in a tank with baffles. The numerical model solves the spatially averaged Navier-Stokes equations, which are constructed on a non-inertial reference frame having six degree-of-freedom (DOF) of motions. The large-eddy-simulation (LES) approach is employed to model turbulence by using the Smagorinsky sub-grid scale (SGS) closure model. The two-step projection method is employed in the numerical solutions, aided by the Bi-CGSTAB technique to solve the pressure Poisson equation for the filtered pressure field. The second-order accurate volume-of-fluid (VOF) method is used to track the distorted and broken free surface. The baffles in the tank are modeled by the concept of virtual boundary force (VBF) method. The numerical model is first validated against the available analytical solution and experimental data for two-dimensional (2D) liquid sloshing in a tank without baffles. The 2D liquid sloshing in tanks with baffles is then investigated. The numerical results are compared with other results from available literatures. Good agreement is obtained. Finally, the model is used to study 3D liquid sloshing in a tank with vertical baffles. The effect of the baffle is investigated and discussed.     

现今绝对板块运动

根据热点假设,热点对于中间层是固定的.相对热点的板块运动叫做绝对板块运动.绝对板块运动模型可以通过反演火山链传播的速率和走向数据以确定相对板块运动在角速度空间的原点来得到.利用一组近来(0～7.8 Ma)全球分布的热点的迁移速率和走向数据,结合板块运动模型NNR-NUVEL1A,已研制出一个叫做APM2的现今绝对板块运动模型.按照该模型,太平洋板块围绕60.063°S、102.210°E处的极以(0.833 0°±0.013 3°)/Ma的速率运动,非洲板块围绕46.849°N、44.372°W的极以(0.101 5°±0.013 4°)/Ma的速率运动,南极板块的运动则以46.871°N、146.942°E为极,速率为(0.084 6°±0.017 7°)/Ma,欧亚板块的运动更慢,极为27.291°N、171.925°W,速率为(0.065 5°±0.020 6°)/Ma.这一模型表明,岩石圈相对深部地幔有一个以49.423°S、90.625°E为极,速率为(0.198 3°±0.013 5°)/Ma的净旋转.表明太平洋热点同印度-大西洋热点不一致,显示太平洋热点的运动也不一致.为了分析和比较,还给出了仅用全球分布的热点的走向数据和仅用印度-大西洋热点的走向数据得到的板块绝对运动的角速度.     

新一代天气雷达(CINRAD)体扫模式起始仰角探讨

CINRAD所采用的各种体扫模式(VCP)均以仰角0.5°为起始进行扫描,通过分析雷达发射波束宽度、地物杂波对产品影响、雷达测量低仰角回波的重要性等因素,提出了CINRAD在低仰角观测时选取低仰角的原则,以及低仰角观测时应注意的问题.     

Effect of parallel electric field on electrostatic ion-cyclotron instability in anisotropic plasma in the presence of ion beam and general distribution function—Particle aspect analysis

Dispersion relation, resonant energy transferred, growth rate and marginal instability criteria for the electrostatic ion-cyclotron wave with general loss-cone distribution in low-β anisotropic, homogeneous plasma in the auroral acceleration region are discussed by investigating the trajectories of the charged particles. Effects of the parallel electric field, ion beam velocity, steepness of the loss-cone distribution and temperature anisotropy on resonant energy transferred and growth rate of the instability are discussed. It is found that the effect of the parallel electric field is to stabilize the wave and enhance the transverse acceleration of ions whereas the effect of steepness of loss-cone, ion beam velocity and the temperature anisotropy is to enhance the growth rate and decrease the transverse acceleration of ions. The steepness of the loss-cone also introduces a peak in the growth rate which shifts towards the lower side of the perpendicular wave number with the increasing steepness of the loss-cone.