四川冕宁稀土矿床包裹体研究

在四川冕宁稀土矿霓辉重晶伟晶岩和碳酸岩矿体的早期萤石，石英中发现了大旺的流体－熔融包裹体。包裹体的捕获温度高于５００℃，说明两类矿体来典型的盐熔体结晶产物。研究还显示，在矿石矿物氟碳铈矿中，存在着大量的流体包裹体，这说明矿床的稀土矿化与热液作用有成因联系，成矿温度为１５０－２７０℃。所有研究结果均证明，四川冕宁矿床是一个与盐熔体有关的热液稀土矿床。     

地幔热柱成矿作用研究进展

地幔热柱构造是地球内部热传导的基本形式，只是地球的不同演化阶段其表现形式和强度有所不同。研究表明，燕山期强烈的地幔热柱活动沟通了深部成矿物质来源，金、银等元素随地幔热柱多级演化以气态→气—液混合相向上运移，在地幔热柱演化的三级单元——幔枝构造的有利部位聚集成矿。并据幔枝构造的成矿模式提出了华北地区燕山、秦岭、太行、胶辽等主要成矿集中区都是河淮地幔亚热柱控制下的幔枝成矿系列。成矿作用均伴随有强烈的构造—岩浆活动，成矿时代多集中在２６０～１２０Ｍａ。金、银多金属矿床具明显的相似性、同源性和深源性     

短波电台对地震仪干扰机理分析及抑制方法

对短波电台发射时干扰地震仪的机理进行了分析。指出干扰形式及干扰噪声进入地震仪的端口，用抗干扰三要素理论结合地震台、站实际条件，采用低通网络抑制干扰，收到了明显的效果     

Fluid—Melt and Fluid Inclusions in Mianning REE Deposit,Sichuan Southwest Cina

Abundant fluid-melt inclusions are found in the aegirine-augite-barite pegmatite and carbonatite veins in the Mianning REE deposit,Sichuan,They were trapped in early stage fluorite and quartz from a salt-melt system at temperatures higher than 5000℃,Meanwhile,fluid inclusions are also present in alrge amounts in bastnaesite.Homogenized between 150 and 270℃,these inclusions are thought to be representative of the physico-chemical conditions of REE mineralization.These results show that the Mianning REE deposit is of typical hydrothermal origin developed from a salt-melt system.     

裂隙各向异性介质2.5维弹性波场数值模拟

研究地震波在各向异性介质中的传播规律是勘探地震学领域的一个重要内容。本文首先讨论了２．５维波动方程，其次，在２．５维空间，用有限元数值模拟方法模拟了裂隙各向异性介质波场，结果用波场切片做了显示。最后对模拟结果做了基本分析，这里讨论的模拟方法也适用于其它类型的得各向异性介。     

复杂地质条件下顶拱大型不稳定块体分析与预测

锦屏一级水电站2#尾水调压室所处位置地质条件复杂,在桩号0+320~0+360和0+0~0+120之间开挖时局部掉块严重。本文综合分析后,提出了2#尾调室顶拱未开挖域产生大型不稳定块体的必要条件是:(1)由节理①④F183组结构面和开挖临空面切割产生;(2)块体大小主要取决于节理组①和④的延伸长度;(3)较大不稳定块体的产生区域,必然位于F18断层带下盘。对2#尾调室顶拱进行搜索预测,预测结果表明该潜在块体位于未开挖区域桩号0+180～0+260之间,规模约为50m3,重达133.5t。根据块体理论分析,其稳定性系数为1.052,处于临界状态,应采取相应的应急支护补强措施。     

兰新高铁烟墩风区戈壁近地表风沙流跃移质垂直分布特性

跃移质作为风沙流的主体,其近地表垂直分布规律是风沙物理学的重要研究内容,对防沙工程具有重要的指导意义。受研究条件与观测仪器限制,戈壁特别是极端大风区近地表风沙流结构特性研究较为薄弱。利用多梯度风蚀传感器与阶梯式集沙仪对兰新高铁烟墩风区戈壁近地表风沙流跃移质的垂直分布特性进行了观测研究。结果表明：兰新高铁烟墩风区戈壁沙粒发生跃移运动的2 m高临界风速达12 m·s^-1;戈壁近地表风沙流具有明显的阵性特征,沙粒跃移发生的时间比例在50%以下,与平均风速成正相关关系,与风速脉动强度无显著相关关系;2 m高阵风7级风速下,戈壁跃移沙粒主要集中于地表50 cm范围内,近地表风沙流结构呈"象鼻效应",跃移质最大质量通量出现在地表2.5~5 cm高度处,沙粒最大跃移高度可达2 m,且沙粒跃移高度随2 m高风速的增加呈指数规律递增。因此,兰新高铁烟墩风区2 m高阻沙栅栏不足以完全阻截戈壁风沙流,是造成烟墩风区兰新高铁轨道积沙的重要原因之一。     

豫中南一次秋季区域性暴雨成因分析

利用常规观测资料、加密自动站资料、NCEP 1°×1°分析资料、FY-2E卫星及雷达资料等,采用诊断分析和对比分析方法,分析了2014年9月27—28日豫中南区域性暴雨的环流形势、强降水成因、中尺度特征及该过程与夏季暴雨的异同。结果表明:本次秋季暴雨过程是高空低槽、副高、中低层切变线、高低空急流、地面倒槽等系统共同作用的结果。持续的水汽辐合为暴雨提供了充沛的水汽条件,水汽通量大值区与水汽辐合中心分布及暴雨落区吻合;低层涡度的发展和水平风的切变导致垂直涡度发展,动力条件较好;K指数高值区对预报暴雨尤其强降水落区有较好指示意义,暴雨中心上空θse值随高度递减,高层低能舌叠加在低层高能区之上,强降水落区位于二者交汇的区域。低层偏东气流与高空槽前西南气流配合产生经向次级环流,上升运动增强;200 h Pa西风急流稳定维持,导致高层抽吸作用明显,有利于区域性暴雨发展。降水云团tbb一般在-32℃左右,发展高度明显低于夏季暴雨云团;降水前期回波为层云回波,后期转变为混合性回波,强降水主要由混合降水回波中的强对流云团导致的。中高层没有明显强冷空气,低层冷空气作用较大,东路冷空气一方面形成冷垫造成动力抬升,另一方面在低层与暖湿气流形成强水汽辐合,是本次秋季区域性暴雨的形成机制,也是不同于夏季暴雨的主要特征。     

Thaw-induced slope failures and stability analyses in permafrost regions of the Qinghai-Tibet Plateau,China

The distribution of permafrost-related slope failures along the Qinghai-Tibet Highway from Wuddaoliang to Fenghuoshan correlates with ice content, slope gradient, and ground temperature. Slope failures are of two types. (1) Retrogressive thaw slumps result from icy permafrost being exposed by either man-induced excavation or fluvial-thermal erosion and undercutting of basal slopes. (2) Active-layer-detachment failures are caused by thaw of icy permafrost at the active layer-permafrost interface. After initial failure, active-layer-detachment failures can lead to retrogressive thaw-slumping and localized surficial landslide. Common trigger mechanisms for failure include high summer air temperatures and heavy summer precipitation. A third possible trigger mechanism for slope failure is earthquake occurrence. A geotechnical slope stability analysis was undertaken for an active-layer-detachment failure that had progressed into a retrogressive thaw slump. A safety factor (F _s ) of 1.24 for the natural slope was determined using in situ tested strength parameters. However, the slope would lose stability when either the groundwater level over the permafrost table exceeded 1.42 m or seismic acceleration reached, or exceeded, 0.03?g.     

Modeling and verifying the impact of time delay on INS-aided GNSS PLLs

The timing error between global navigation satellite system (GNSS) and inertial navigation system (INS) processes limits the integration performance in GNSS/INS integrated systems. In a deeply coupled system, this timing error affects not only the integrated navigation solution, but also the GNSS signal tracking. We propose a time-domain model of INS-aided second-order phase-locked loops (PLLs) in consideration of the INS aiding delay, and analyze the effect of INS aiding delay on the tracking errors in details. In addition, an integrated hardware deeply coupled system platform was developed to verify the impact of time delay on INS-aided PLLs. Simulation and field vehicles testing results demonstrate that the tracking error of the INS-aided PLL caused by aiding delay increases with the lengthening of the delay time, the compression of the bandwidth, and the increase in the acceleration. Testing results verify the proposed model.