江苏埤城岩群岩石物理性质

对ZK03孔岩芯物性测定,获得了埤城岩群密度、磁化率、剩余磁化强度和电阻率、极化率5项物性参数。埤城岩群有较高的密度,与围岩的密度差达0.15×10³ kg/m³,具有重力勘探的物性前提;埤城岩群有较高的电阻率,与部分围岩电阻率差异明显,可有条件的开展电阻率勘查工作;埤城岩群具低磁性和低电化学活动性,磁测和激电方法应慎用。     

长江-黄河源区未来气候情景下的生态环境变化

在IPCC的情景下,青藏高原到2100年气温将上升2～3.6℃,最大的升温将出现在冬季,降水模式将会逐渐发生改变,从北部的增加到西南的减少.对于江河源区的范围,到2100年增温在2.4～3.2℃,降水量增加约-50～200mm.植被群落在气候变化条件将发生明显变化,温带草原到寒温带针叶林群落的面积增加,而温带荒漠到冰缘荒漠的面积都缩小,分布界线向更高的海拔高度迁移.到2100年气温上升3℃,降水不变则冰川长度小于4km以下的冰川大都消失,整个长江源区的冰川面积将减少约60%以上.如果考虑降水增加,冰川面积在2100年气候条件下减少约40%,将从现在的1168.18km²减少到00km²左右,冰川融水的比重也将会由现在的占河流总径流的25%下降到18%.另外,由于冰川大量退缩,草地和湿地蒸发量加大,许多湖泊将会退缩和干涸,沼泽地退化、沙化扩展,草地退化等一系列严重的生态问题将更加突出.     

赤潮藻类生态营养模型非线性动力研究

基于营养盐、赤潮藻类、植食浮游动物之间的食物链关系,考虑到由于海洋内微生物分解动植物遗体对营养盐的补充以及物理因素导致的流失,文中建立了营养盐一赤潮藻类一植食性浮游动物相互作用的耦合生态动力学模型。运用现代非线性动力学理论,对模型解的动力学稳定性进行了分析。结果表明,随着参数的变化,系统稳定性也随之变化,甚至出现HOPF分岔现象。     

无粘性土中桩基水平非线性地基反力系数研究

非线性地基反力系数法是分析近海桩基水平大变形性状的有效途径。针对我国近海广泛分布的粉土和砂土地基,建立了无粘性土中桩基非线性地基反力系数与桩基径向土压力之间的关系,据此基于物理模型试验和现场试验结果获得了粉土和砂土地基反力系数与桩径和桩身变位之间的非线性关系,为桩基水平受力大变形分析提供了简单有效的方法,适用于不同直径桩基的计算,得到了桩基物理模型试验和现场试验结果的验证。     

基于高光谱大气红外探测器模拟亮温的稳健变分反演研究

经典变分反演法是基于观测误差服从高斯分布的假定,对偏离均值较大的离群值较敏感。当实际观测数据包含离群值观测误差呈现非高斯分布时,如果采用经典反演法进行变分反演就会产生大的偏差,甚至导致变分反演的失败。使用经典变分反演法首先需要进行质量控制,剔除所谓的离群值,但有相当部分的离群值包含了一些亮点,如天气现象。如果对其“视而不见”,则对很多重要的信息就无法把握。基于此,研究采用稳健变分反演的思想同化这些离群值,主要思想是把M-估计法（L2、Huber、Fair和Cauchy一估计）的权重函数耦合到经典变分反演中,在每次变分反演极小化迭代过程中重新估计观测项对经典变分反演目标泛函的贡献率。采用高光谱大气红外探测器（AtmosphericInfraRedSounder,AIRS）的通道模拟亮温进行理想试验,结果表明：采用Huber一估计进行稳健变分反演对温度和湿度反演具有较好的效果;采用Cauchy-估计得到的效果反而更差,这是由Cauchy等分布函数固有的缺陷所决定的。因此,稳健变分反演观测误差非高斯分布是可行的,但依赖M-估计法权重函数的选取。     

重庆市公共租赁住房申请审核管理信息平台设计与实现

为解决中低收入和新就业人员的住房问题,从2010年开始,重庆市在全国率先大规模进行了公共租赁住房的建设。本文从如何通过公共租赁住房申请审核管理信息系统的建设,支撑公共租赁住房的申请审核、摇号配租工作,并重点就如何利用整合的市级部门信息资源,审核申请人的申请资格,从而确保公共租赁住房能得到公平、公开、公正的分配进行了介绍。     

关于国土资源“一张图”建设的思考

国土资源＂一张图＂建设作为国土资源信息＂十二五＂的重要工作,目前正在全国各级国土资源管理部门中如火如荼的开展,但对于国土资源＂一张图＂的定义和建设方法,全国并无统一的界定和设计,本文在对目前全国各地国土资源＂一张图＂建设进行综合分析的基础上,提出了作者自己关于国土资源＂一张图＂建设的思考。     

The Çubukludağ graben,south of İzmir: its tectonic significance in the Neogene geological evolution of the western Anatolia

Abstract

Field studies on the Neogene successions in south of ?zmir reveal that subsequent Neogene continental basins were developed in the region. Initially a vast lake basin was formed during the early-Middle Miocene period. The lacustrine sediments underwent an approximately N-S shortening deformation to the end of Middle Miocene. A small portion of the basin fill was later trapped within the N-S-trending, fault-bounded graben basin, the Çubukluda? graben, opened during the Late Miocene. Oblique-slip normal faults with minor sinistral displacement are formed possibly under N–S extensional regime, and controlled the sediment deposition. Following this the region suffered a phase of denudation which produced a regionwide erosional surface suggesting that the extension interrupted to the end of Late Miocene–Early Pliocene period. After this event the E–W-trending major grabens and horsts of western Anatolia began to form. The graben bounding faults cut across the Upper Miocene–Pliocene lacustrine sediments and fragmented the erosional surface. The Çubukluda? graben began to work as a cross garden between the E–W grabens, since that period. © 2001 Éditions scientifiques et médicales Elsevier SAS     

Evidence for strengthening of the tropical Pacific Ocean surface wind speed during 1979–2001

Using multiple surface wind speed (SWS) data sets and trend empirical orthogonal function analysis, we have explored the trend in SWS associated with the large-scale tropical Pacific atmospheric circulation for the period 1979–2001. The present research provides a robust evidence of strengthening of the tropical Pacific Ocean SWS during this period and the magnitude is generally in line with the finding of Wentz et al. The strengthening in SWS is closely associated with the so-called La Ni?a-like sea surface temperature (SST) trend pattern rather than the changes in the ENSO, ENSO Modoki, or PDO. The present results, together with those from some recent climate model simulations, suggest that global warming forcing may have caused an intensification of SWS in the tropical Pacific Ocean by inducing the La Ni?a-like SST trend pattern due to ocean dynamics. Meanwhile, the strengthening in the tropical Pacific Ocean surface trade winds may also feedback to enhance the La Ni?a-like SST trend pattern under the positive wind-upwelling dynamic feedback mechanism.     

Imaging-Based Characterization of Perthite in the Upper Triassic Yanchang Formation Tight Sandstone of the Ordos Basin,China

This work investigated the element distribution of perthite from the Upper Triassic Yanchang Formation tight sandstone in the Ordos Basin of northern China by field emission scanning electron microscopy(FE-SEM) and energy dispersive spectrometer(EDS). FE-SEM results indicate significant differences in the morphology of Na-rich feldspar when K-rich feldspar is the main component of the perthite. EDS results show that different types of perthite have clearly defined differences on different element indexes. Additionally, indexes such as average-weight-K(K-rich)/Na(Na-rich), maximumweight-K(Na-rich)/Na(Na-rich) and average-atomic-K(K-rich)/Na(Na-rich) might be the most effective ones to identify perthite types. Perthite is divided into six main types, i.e., perthite with thick parallel stripe distribution, with thin parallel stripe distribution, with lumpy stripe distribution, with dendritic stripe distribution, with encircling stripe distribution, and with mixed stripe distribution.