探地雷达在公路工程建设中的应用

探地雷达作为一种高精度无损探测新技术，已广泛应用于工程勘察各领域，具有探测速度快、定位准确、轻便灵活、可实现连续透视扫描以及二维彩色图像实时显示等优点。不同的地质条件，探地雷达将表现为不同的波谱特征。文章在分析了探地雷达的分辨率与地层介质、探测深度、天线频率的基础上，例举了其在第四系地质、活动断裂、滑坡、土体性质等不同地质条件下的探测效果。     

华北地区拆离滑脱带控震作用初探

华北东部盆岭区以地震多、震级大、损失惨重而称。以往地震地质研究多注重断裂交汇、拐点、分枝等部位的控震作用。但是，华北盆岭区多次大震的烈度并不呈线型展布，震源也并非沿陡倾断裂走向分布，而是在一定深度上(近水平)弥散展布，故人们开始注意深部滑脱带控震的探讨。笔依据近十余年华北地幔亚热柱的研究认为，华北断陷区之下为—强烈上隆的地幔亚热柱。地幔物质的上隆及上侵作用使上地壳裂解断陷，而中地壳在地幔、下地壳的影响下形成相间展布的低速—高导层。在地幔亚热柱热物质流向外拆离的带动下，中、下地壳亦由亚热柱顶部向外围拆离滑脱。当中、下地壳拆离到上地壳裂陷盆地边缘受到造山带的阻挡而减慢时，两之间便产生剪切作用，导致应力不断积聚并阶段性释放，从而造成亚热柱外围地震频繁发生。     

Relationship between light rare earth deposits and mantle processes in Panxi rift,China

Many light rare earth deposits, such as Maoniuping, Dalucao, Panzhihua deposits, are collectively distributed in Panxi rift of Sichuan Province, China, and closely associated with the aegirine quartz syenite-carbonatite complex. Carbon and oxygen isotope studies demonstrate that the carbonatites in the complex are of typical igneous origin related to mantle processes. Electronic microprobe studies show that the fluid-melt inclusions found in the complex are enriched in light rare earth elements (LREE), which suggests that the magma was rich in LREE and could serve as the ore source for the regional LREE mineralization. Both the aegirine quartz syenite-carbonatite complex and the LREE mineralization found therein were derived from the mantle. The rare gas isotope analyses also support that there is a genetic association between the LREE mineralization and mantle processes.     

贺兰山地区沙尘暴沙尘起动和垂直输送物理因子的综合研究

根据 4a来在贺兰山两侧沙漠和沙地测站积累的微气象和沙尘谱观测资料 ,结合有关文献 ,综合分析了沙尘起动和垂直输送的物理机制 ;讨论了强风的动力作用、近地面不稳定层结的热力作用和沙尘物质源特征 ;概述了不同尺度天气系统中上升运动特征 ,沙尘的沉降末速计算、沙漠地表的湍流输送特征和垂直速度资料、沙漠地表的超绝热梯度出现的频率和强度及逆湿现象 ,沙漠和沙地的沙尘粒度、地表性质和沙土含水率对起动风速的影响。     

Deep－Source Ore－Forming Materials and Prospecting of Gold Deposits in Eastern Hebei,China

Eastern Hebei Province is one of the important gold mineralization areas in North China,and detailed investigations have been made in this area.Different mineralization models and different ore-formng surces have been proposed for the gold deposits in this area.As more detailed work was made and more information has been accumulated,it is necessary to make a new investigation on gold metallogenesis and its source.This paper presents the data about 13 gold deposits(occurrences.)It is concluded that the element gold came from the deep mantle.Different models of metallogenesis substantially describe such processes that ore-forming fluids were involved in metallogenesis in different favorable loci.Gold ore prospecting should be focused on fluid channel ways and favorable structures.     

使用Ghost自动备份和恢复操作系统

当计算机出现非法操作、死机、运行缓慢、病毒或者操作的失误,导致硬盘上的数据丢失和系统崩溃如此类问题时,采用Ghost软件自动备份和恢复操作系统。     

丽江地震前后西南地区定点形变变化的特点分析

研究了1996年2月3日丽江7．0级地震前后西南地区地倾斜观测的特点及与中强地震活动之间的关系。研究结果表明，丽江地震后西南地区地倾斜变化幅度与区域地震活动水平具有逐年减弱的趋势，丽江地震后5年内中强地震都发生在快速变形以后回复的时间段内，而5年之后，中强地震则往往发生在一些快速变化的极值点时刻。在对每次中强地震前形变特征分析的基础上，还研究了短期形变前兆对地震的触发机制，给出了每次地震前短期形变迁移的速度分布。最后讨论了短期形变前兆的非同步性、非遍历性、不可重复性及无记忆性等特性。尽管这些特性可能使得经验地震预测变得更为艰难，但是认识这些特性将可能帮助找到新的预测途径。     

Ground-temperature controlling effects of ductventilated railway embankment in permafrost regions

Based on observed data from field-testing embankment of the Qinghai-Tibet Railway, ground-temperature controlling effect of duct-ventilated embankment is studied in this paper. The results show that ventilation ducts can effectively cool the soils surrounding the ducts of the embankment, and the heat budget of the ambient soils in a year shows as heat release. Temperature status of the permafrost below the embankment with ducts buried in the relatively high position is similar to that of the common embankment. The permafrost processes warming all along in the two freezing-thawing cycles when the embankment was constructed. However, the temperature of the frozen soils below the embankment, in which the ducts buried in the relatively low position, rises a little in the initial stage. After that, it cools down gradually. At the same time, ventilation ducts can effectively reduce the thermal disturbance caused by the filled soils. The frozen soils below the common embankment and that with high-posited ducts absorb heat all along in the initial two cycles. While the soils below the embankment with low-posited ducts begin to release heat in the second cycle. This phenomenon proves that the ventilation embankment with low-posited ducts shows efficient temperature-controlling effect. Such embankment can actively cool the subgrade soils and therefore keeps the roadbed thermally stable.     

高速公路施工对地磁观测的影响

观测环境的破坏对地磁观测的影响是严重的,用仪器如实地记录环境的变化,用实际观测的数据来研究外界干扰的影响很有意义。利用郑州地震台的地磁资料,采用趋势分析、相关分析等方法,对高速公路施工期间的观测资料进行研究。最后得出高速公路施工的不同时期,对地磁观测的影响情况,和相同影响情况下模拟仪器和数字化仪器记录的差异。