About the Aerothermoelastic Stability of Panels in Supersonic Flows

This article provides new insights into the aerothermoelastic stability of thin plates. Particularly, the issue of loss of stability of an isotropic plate-strip of constant thickness immersed in a supersonic flow field and subjected to a variable temperature field through the thickness is examined. Using the basic principles of the theory of aerothermoelasticity of isotropic bodies, the theories of flexible panels, and the linear law of temperature field through the thickness of the panel, the stability equations and associated boundary conditions are obtained. As expected, the coefficients of the aerothermoelastic governing equations depend on the thermal load, and consequently the panel-flutter critical speed depends on temperature. The model takes into account quadratic and cubic aerodynamic non-linearities as well as cubic geometric non-linearities. Due to the inhomogeneity of the temperature field distribution across the thickness plate buckling instability occurs. This instability accounts for the deformed shape of the plate and the stability boundary depends on the variables characterizing the flow speed, the temperature of the middle plane and the temperature gradient in the direction normal to the plane. It is shown that the combined effect of the temperature field and free-stream regulates the process of stability and the temperature field can significantly change the flutter critical speed and flutter behavior. The problem of stability is also considered in the non-linear framework. The existence and behavior of flutter-type vibrations is investigated at pre- and post-critical speeds. The influence of the temperature field on the dependency of the limit cycle amplitude as a function of speed is studied. Results and discussions are presented along with pertinent concluding remarks.     

Are memory self-efficacy and memory performance related? A meta-analysis.

The association between memory self-efficacy (MSE) and memory performance is highly documented in the literature. However, previous studies have produced inconsistent results, and there is no consensus on the existence of a significant link between these two variables. In order to evaluate whether or not the effect size of the MSE–memory performance relationship in healthy adults is significant and to test several theory-driven moderators, we conducted a meta-analysis of published and unpublished studies. A random-effects model analysis of data from 107 relevant studies (673 effect sizes) indicated a low but significant weighted mean correlation between MSE and memory performance, r = .15, 95% CI [.13, .17]. In addition, the mean effect size was significantly moderated by the way MSE was assessed. Memory performance was more strongly related to concurrent MSE (perceived current ability to perform a given task) than it was to global MSE (perceived usual memory ability in general). Furthermore, we found marginally larger MSE–memory performance correlations when the memory situations used to assess MSE involved familiar stimuli. No effect of the method used to assess global MSE or domain MSE (memory rating vs. performance predictions) was found. The results also show that the resource demands of the memory tasks have a moderator effect, as the MSE–performance correlation is larger with free-recall and cued-recall tasks than it is with recognition tasks. Limitations (generalization issues, moderators not considered) and implications for future research are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

共转换点速度分析

转换波共转换点相对于共中心点的偏移距离随着纵横波速度比、深度以及炮检距等因素的变化而变化，因此不能采用固定道集的方法进行转换波速度分析，而应当在速度比与深度等因素变化时，速度分析所用的道集也做相应的变化。本文提出了一种随着速度比与转换点深度的变化而动态抽道的转换波速度分析方法，实现了扫描叠加速度、转换点深度与共转换点道集的一一对应。此法应是一种真正意义上的共转换点速度分析技术。经理论模型与实际地震资料验证，表明了该方法的有效性。     

初至波层析影响因素分析

 在山地地震勘探中，目前广泛采用初至波走时层析方法反演起伏地表速度结构，但其最终反演结果受许多因素影响。本文通过大量数值试验对影响表层模型层析反演精度的方程解法、先验信息利用、观测系统、初始模型及平滑因子等主要因素进行了详细的分析对比，总结出了最佳参数的选择原则和范围，并建立了内部约束方程。将本文方法应用于实际资料处理，取得了较好的成像效果。     

检波器组内高差对高频信息压制的理论分析

 在地震勘探野外采集中，目前普遍采用地表低速带的速度〖WTBX〗V0〖WTBZ〗乘以目的层反射波主频的1/4视周期来计算检波器组内高差允许值，即使在沙漠及山地的地震资料采集中也是如此。本文通过理论计算与模型试验证明：在主频不是很高而次生干扰波非常发育的一些工区，采用降速带的速度〖WTBX〗V1〖WTBZ〗乘以最浅目的层反射波主频的1/2视周期计算组内高差,就可以得到信噪比较高的用于构造解释的低频剖面；相反，如果在这类地区拘泥于原先关于组内高差的规定，就会因为强烈的次生干扰波没有得到有效压制而导致地震剖面的信噪比大大降低，进而使得企图通过减小组内高差、保护高频信息、提高分辨率的初衷也无法实现。     

二维大地电磁数据的聚焦反演算法探讨

 文中简要分析了当前地球物理反演中几种常用的模型目标函数，并根据聚焦反演成像方法的基本理论，在大地电磁反演目标函数中引入了一个新的稳定泛函，以代替传统最小构造或最大平滑准则下的模型目标函数。通过对自适应正则化共轭梯度法解最优化问题过程的研究，以及对几个典型模型的试算，并将其结果与传统反演算法结果进行对比分析，表明了本文方法的正确性和较高的计算精度。最后对雷—琼拗陷一条实测的测线的MT资料进行聚焦反演成像处理，并与同一测线的地震资料进行对比表明,聚焦反演结果具有很高的准确性。     

THE RELATIONSHIP BETWEEN THE TAIWAN WARM CURRENT AND TSUSHIMA WARM CURRENT

The Taiwan Warm Current (TWC) and the Tsushima Warm Current (TSWC) flow northward over the shelf in the East China Sea (ECS), which some previous studies regard as a Taiwan-Tsushima Warm Current (TTWC) System. But the roles of the TWC and TSWC in the formation of the TTWC system have not been clarified. This article will show that the TSWC is more important in the TTWC system. Using a three-dimensional baroclinic model, we conducted several numerical experiments to reveal the dynamic relationship between the TWC and TSWC. The results show that the TWC has little effect on the TSWC, while the TSWC has a significant effect on the TWC. A source-sink driven mechanism along isobaths may be used to explain this phenomenon. The perennial northward flow through the Tsushima Strait pumps the response over the northern shelf in the ECS that gives rise to the TWC. Although the TSWC is located at the "downstream" region, it could induce about 0.5 Sv to TWC in annual mean values.     

NUMERICAL SIMULATION OF TRANSIENT FLOW AROUND A SHIP IN UNSTEADY BERTHING MOTION

Ship berthing is a specific maneuver operation. The flow around a berthing ship and the forces acting on the hull are quite different from those for a ship in normal navigation. By solving the unsteady Reynolds-Averaged Navier-Stokes (RANS) equations, the transient flow field around a ship undergoing unsteady lateral motion is simulated and the varying lateral hydrodynamic force acting on the hull is evaluated in this article. The numerical results obtained with different turbulence models are analyzed and compared with experimental results and other numerical results published in literature, and a turbulence model more suitable for simulation of the viscous flow around a ship undergoing unsteady berthing is determined.     

北海盆地大油气田形成条件及分布特征

北海盆地为典型的中生代裂谷盆地,其油气的形成与分布具有较明显的特征,了解它们的形成与分布可以指导其他裂谷型盆地的勘探。根据IHS及C&C提供的相关数据,结合生油层、储层、盖层及圈闭特征方面的研究,对北海盆地及邻区已发现的57个大油气田进行分析,得出南北海盆地气源岩为上石炭统威斯特伐利亚阶煤系地层,北北海盆地主要油源岩为上侏罗统到下白垩统沉积的KimmeridgeClay组(英国)、Mandal组、Draupne组(挪威)和Farsund组(丹麦)泥页岩;主力储层分别为南北海盆地的赤底统砂岩,北北海盆地维京地堑内中侏罗统Brent群砂岩及中央地堑内的上白垩统白垩;南部区域盖层为上二叠统盐岩,北部区域盖层以泥灰岩为主。北海大油气田形成与分布的主要受控因素为:有效烃源岩分布及其成熟度;优质储集体的发育及其分布;盐运动及同裂谷期断裂作用产生的相关盐构造和断块背斜、掀斜断块圈闭的发育;区域性盐岩及泥灰岩盖层的有效封盖。这些有利条件共同作用下,北海大油气田在整个区域上具南部产气、北部以油为主的特点;局部上,受有利储层Brent群分布位置和中央地堑区域盐构造运动影响,大油田集中富集于维京地堑西北部与中央地堑中部挪威区域。     

苏北盆地海安凹陷泰州组输导体系及其控藏作用

油气输导体系研究是油气成藏机理研究的重要内容之一.采取宏观与微观相结合的研究思路,综合应用录井、测井、地震、分析测试等资料,识别苏北盆地海安凹陷泰州组油气运移范围和路径,指出了油气运移的优势通道,分析了海安凹陷泰州组输导体系的特征及其组合方式.泰州组一段3套骨架砂体和系列断层相互配置,形成了连通砂体型、断层型、砂体—断层复合型3种输导体系类型.输导体系类型决定了该区的油气成藏模式,在泰州组一段1砂组,以连通性较差砂体为输导体系,发育岩性油气藏和构造-岩性油气藏;在2+3砂组中,以断层或砂体—断层为输导体系,发育构造油气藏.综合研究表明,海安凹陷泰州组的砂体和断层是油气运移优势通道,以连通砂体为主要运移通道的油气藏常形成于距烃源层较近或相邻的层位;而以断层为垂向运移通道的油气藏常在断层带附近多层叠置.