华北地区居里温度面与地震活动的再研究

在前人工作的基础上,运用三维磁性层反演方法和程序,对华北地区航磁资料进行了再处理,得出了研究区内居里温度面的定量埋深,结合人工地震测深和深部流体对地震成因及其与居里面的关系进行了讨论。     

Possibility of the Application of the Ultra-long Electromagnetic Wave Remote Sensor to Marine Geological Exploration

The ultra-long electromagnetic wave remote sensing technique developed by Peking University is one of new future techniques, which can detect the submarine geological information from the depth of 20 to 10000 m below the surface by receiving natural ultra-long electromagnetic waves (n Hz to n 100 Hz). The new remote sensor is composed of three parts: a main instrument with a portable computer, an antenna with an amplifier and an external power.The new remote sensing technique is characterized by good stability and reproducibility at the same spot but at different times and high sensitivity and high signal-to-noise ratio, and can reveal geological and lithologic boundaries as well as strata and related mineral sources. Two years of marine geological experiments on this technique have indicated that it can solve many problems in marine geological exploration, e.g. the burial depths of sea-floor mud, Quaternary sediments and submarine structures. This technique can be applied to detecting the sea bed depth     

Mineral Surface after Reaction with Aqueous Solution at High Temperatures and Pressures

This work presents new experimental results on surface chemistry of reacting minerals and interface kinetics between mineral and aqueous solutions. These experiments were carried out using a flow reactor (packed bed reactor) of an open system as well as a continuous stirred tank reactor, CSTR. The authors measured reaction rates of such minerals as zeolite, albite and carbonate (rhodochrosite, dolomite) in various solutions, and tested corresponding mineral surface by using SEM, XPS, SIMS, etc. This paper mainly presents the experimental results of zeolite dissolution in water and in low pH solutions at room temperature, and dolomite dissolution at elevated temperatures. The results show that the release rates of Si, Al and Na of zeolite are different in most cases. The incongruent dissolution of zeolite is related to surface chemical modifications. The Na, Al and Si release rates for dissolution of albite and zeolite in water and various solutions were measured as a function of temperature, flow veloci     

应用改进的遗传算法反演多层密度界面

利用具有全局优化功能的遗传算法直接反演多层密度界面.首先根据重力反演的特点对遗传算法进行改进, 使遗传算法基因交换过程中交换位置的确定同重力异常的拟合情况相结合, 给出适合于重力反演特点的遗传算法.然后利用改进后的遗传算法直接反演多层密度界面.理论模型和实际剖面的计算表明改进是有效的.      

一个可用于地震分析的界面力学模型

首先简要介绍了层间界面在侧压力及反平面剪切载荷共同作用下,剪切破坏的剪切梁模型及其主要力学行为特性;在此基础上,分析了层间界面失稳阶段结构对外界的能量释放量,以及由于层间界面上应力锁死现象而产生的后续再加载过程中的载荷突变;最后讨论了上述力学现象的地震学意义．      

有限元无限元接触单元耦合法在桶形基础结构与土壤相互作用分析中的应用

桶形基础受负压作用下沉时,基础与地基土体之间产生相互作用.为了合理地模拟2种不同材料之间的相互作用,将有限元、无限元、接触单元耦合的数值计算方法引入到桶形基础与土壤相互作用的强度分析中,并将用该方法得到的计算结果与模型试验比较.其中,接触单元考虑结构与土壤之间的错动滑移及拉裂;而无限元可有效地反映地基土体无限域的远场效应.     

国土资源部CBERS-02B星“主用户”应用机制研究

以推动国产卫星数据应用为要旨,通过相关组织落实、工作部署以及CBERS-02B星数据的推广应用,逐步深化02B星"主用户"应用机制.     

一种基于氨基酸物理化学性质上的DNA序列图形表示及相似性分析

基于氨基酸的物理化学性质,将氨基酸分为4类,疏水,带电荷,有极性,甘氨酸,在此基础上给出DNA序列一种新的图形表示方法:将1列DNA序列表示为二维空间中的3条特征曲线,利用计算C(i,j)矩阵的主特征值,给出DNA序列的3维特征向量,得到相似距离矩阵.最后计算10种不同物种β-球蛋白第一段外显子的欧式空间距离矩阵D(i,j),并利用UPGMA算法给出了这10种不同物种基于这种相似关系的系统发生树.     

基于嵌入式的μC/GUI图形用户界面系统设计

针对现有岩心扫描仪产品的不足,提出了通过嵌入式μC/GUI图形用户界面的方法,实现基于LCD动态显示的人机界面及各个控制任务调度。阐述了μC/GUI的文件结构,移植步骤和注意事项,编写了相应的LCD驱动文件,实验结果证明系统运行良好。     

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