2001年影响广西的台风卫星云图特征分析

应用定性和定量分析方法 ,对 2 0 0 1年 4个影响广西的台风云图特征进行分析 ,发现旋转结构明显、组织结构紧密、面积大的台风云系 ,所产生的台风强度强、持续时间长、降水范围宽、过程雨量大     

土岭—石湖金矿床中黄铁矿的成分特征及其成因意义

河北省灵寿县土岭-石湖金矿床产于燕山期花岗闪长岩体与太古宙阜平群变质岩系的外接触带中。金矿床中黄铁矿的硫同位素显示金的成矿热液与花岗闪长岩岩浆同源。黄铁矿的主成分具有亏硫特征,属典型的内生型。从矿脉到蚀变岩及受蚀变围岩,黄铁矿的Au、Ag、As含量及Au/Ag比值降低,Co、Ni、Se含量及Co/Ni此值、S/Se比值升高。这些元素的含量及有关参数对金及黄铁矿的取样位置具有良好的指示意义,是确定矿体位置及其含金性的标志,也是成矿温度的函数。     

尼泊尔8.1级地震建筑物震害遥感提取与分析

2015年4月25日尼泊尔发生的8.1级地震,造成重大人员伤亡与经济损失。在地震前、后灾区高分遥感影像分析处理基础上,结合现场实地调查,对灾区房屋建筑及其震害程度进行了遥感解译,编制了地震灾区房屋建筑震害分布图。结果分析表明:尼泊尔地震灾区影像上显示的建筑物震害分布与该区域房屋结构类型、主余震位置和区域活动构造分布密切相关。其中,房屋较为严重倒塌区域主要分布在8.1级主震和7.5级余震震中附近,但这两个区域并没有相连;居民点建筑物个别倒塌的居民地则连成一个区域。影像上显示的建筑物倒塌区域,与多数8级巨大地震比较,总体上极震区震害偏轻,但在南南西(垂直于破裂方向)上展布较宽。这一特征与引发该地震的印度与欧亚大陆板块边缘活动断裂在深部呈近似于平行地表的低角度断层面破裂引起的地震动能量在地表相对较宽而低的分布特征是一致的。     

毛乌素沙区沙漠化土地防治区划

毛乌素沙区在自然条件、沙漠化程度和变化趋势及产业经济发展特征等方面具有明显的空间异质性,合理地进行区域沙漠化土地防治区划是因地制宜开展土地沙漠化防治工作的重要基础。选取自然条件、沙漠化发展过程及人类活动等方面12个指标,将毛乌素沙区划分为黄土高原与鄂尔多斯高原过渡区、毛乌素沙地腹地典型草原区和西鄂尔多斯荒漠草原区3个区、7个亚区、12个小区。在区域可持续发展战略的实施过程中,要根据亚区和小区的特点有针对性地进行沙漠化土地的防治,充分利用区域资源优势,优化产业结构,确保经济效益、社会效益和生态效益的稳步提升。     

超高压变质作用研究现状及问题

本文从超高压变质作用的矿物学、Ｐ－Ｔ－ｔ轨迹和超高压地体抬升、保存机制三个方面总结了近年来超高压变质作用研究所取得的重要进展和存在的问题。超高压变质作用的矿物学研究正在向深入发展，其Ｐ－Ｔ－ｔ轨迹具有三种成因类型。而其超高压地体的抬升、保存机制则是争论的焦点，其中增生楔模式（Ｐｌａｔｔ，１９８７）和连续俯冲─仰冲机制较好地解释了抬升过程，但也存在一些问题需进一步研究。     

SIMULATION AND PREDICTION OF DEBRIS FLOW USING ARTIFICIAL NEURAL NETWORK

Debris flow is one of the most destructive phenomena of natural hazards. Recently, major natural haz-ard, claiming human lives and assets, is due to debris flow in the world. Several practical methods for forecasting de-bris flow have been proposed, however, the accuracy of these methods is not high enough for practical use because of the stochastic and non-linear characteristics of debris flow. Artificial neural network has proven to be feasible and use-fill in developing models for nonlinear systems. On the other hand, predicting the future behavior based on a time se-ries of collected historical data is also an important tool in many scientific applications. In this study we present a three-layer feed-forward neural network model to forecast surge of debris flow according to the time series data collect-ed in the Jiangjia Ravine, situated in north part of Yunnan Province of China. The simulation and prediction of debris flow using the proposed approach shows this model is feasible, however, further studies are needed.     

基于各向异性致密砂岩油地震岩石物理模型的脆性指数研究（英文）

致密砂岩油储层的脆性研究是致密砂岩油地震预测的重要内容,需要引入合适的脆性指数来建立致密砂岩油储层的脆性评价标准。本文首先构建了各向异性致密砂岩油地震岩石物理模型;依据该模型进行了各向异性介质弹性常数的脆性敏感性分析,建立了新的脆性指数;并分别从脆性敏感性定量分析、岩石物理响应特征分析以及交汇图分析三个方面系统研究了新脆性指数在致密砂岩油脆性预测上的适用性。分析结果表明,新脆性指数较其它传统脆性指数,不仅其脆性敏感性高,而且更适合于致密砂岩油储层"甜点"区的脆性预测。     

Mechanical behavior and micro-structure of cement kiln dust-stabilized expensive soil

In this study, the effects of cement kiln dust (CKD) on the swelling properties, strength properties, and microstructures of CKD-stabilized expansive soil were investigated. Samples were prepared and stabilized with different CKD content ratios, ranging from 0 to 18% by dry mass. The results obtained show that the maximum swelling pressures decrease exponentially with increases in CKD content. Both the cohesion and unconfined compressive strength (UCS) increase at ratios below 10% CKD and then decrease slightly, above that ratio. CKD can also improve the strength of saturated, expansive soil. There is no visible change of UCS for soil without CKD when cured, while the UCS of a sample with 10% CKD content after curing for 90 days is higher than that after curing for only 1 day. This indicates that CKD can improve the long-term strength of expansive soil. Finally, microstructure analysis reveals that the addition of CKD reduces the montmorillonite content of expansive soil and decreases its swelling properties. The addition of CKD also changes the pore volume distribution, both the size and amount of macro-pores and micro-pores decrease with increase in CKD content. For saturated samples, the size of macro-pores is obviously reduced, while that of micro-pores is slightly increased for both treated and untreated soils. Hydration and saturation processes make the soil structure become dispersive which results in a lower strength, and adding CKD can restrain this process. The suggested optimal CKD content is between 10 and 14% and with a curing time of more than 27 days.     

地震计线性误差精确测试

利用同步测试标准地震数据采集器标定电流的地震计线性误差测试方法,避免了标定信号输出电流波动对地震计线性误差测试的影响,按DB/T 21—2007规定的方法进行数据处理,并判定结果是否符合DB/T 22—2007的要求。实际测试表明,该方法测试精度可以达到0.000 5%,满足测试线性偏差小于0.01%的需要,且操作简单,无额外设备要求,可行性高,可在固定地震台站、野外等条件下使用,具有较大的应用价值。     

世界一些大城市防灾减损的比较研究

比较分析了一些大城市的防灾减损措施，提出了具体对策。