压实作用与磁倾角变化的实验研究

库车坳陷上新统库车组古地磁资料表明,泥岩组样品的平均磁倾角最小,从泥质粉砂岩、砂岩到粉砂岩其平均磁倾角依次递增,相应的古纬度值从泥岩、泥质粉砂岩到粉砂岩依次增高。为了研究这一现象,我们选取了 48个库车组样品作了一系列实验。实验结果表明,压实作用引起的体积变化与磁倾角降低呈线性关系.     

Morphological Characteristics of Till Formations in Relation with Mechanical Parameters

The study of landslides stability on mountain slopes can become very difficult when materials in movement are heterogeneous: it is a current problem with the old glacial till formations presently under study (Aspe Valley, Pyrénées, France). Analysis of slope stability using numerical models necessitates accurate data about mechanical and physical properties. Because tills are very heterogeneous, a large sample is necessary but, unfortunately, data acquisition costs a lot of time and money. Therefore, we would like to estimate mechanical data from correlated parameters that are easier to acquire (morphological parameters using image analysis). Observations in the field and previous mechanical results in the laboratory have shown that differences between the behavior of tills seem to be related not only to their 3D structure but also to the morphological and petrographical characteristics of their components. The aim of this paper is first to illustrate how to classify the till formations textural and petrographical characteristics at the sample scales; these classifications are based on the distributions of size, shape of their constitutive elements (blocks, matrix, etc.). Significant statistical results are available by applying image analysis methods based on mathematical morphology. Next we show how these characteristics are related to the mechanical characteristics (friction angle, cohesion). Six specific till formations were collected, and we establish the relation between the effective internal angle of friction and the elongation factor.     

张北5.6级地震前P波出射角和方位角的异常变化

选用了张家口台记录的P波三分向的初动振幅，计算其出射角及方位角的大小。研究了1999年3月11日张北5.6级地震前出射角与方位角出现的异常变化，并对地震前异常现象进行了初步讨论。     

鄂东南大沙坪下奥陶统碳酸盐重力流及自发振动成因机理

位于中扬子地台东南缘的大沙坪剖面下奥陶统留咀桥组下段重力流沉积非常发育，重力流沉积类型以富基质的Ａ型碎屑流沉积为主。经区域资料横向对比，这种发育是局部性的。对这种局部性的重力流沉积，本文应用自发振动原理进行了阐述，分析了沉积迁移常数Ｋ、沉积物滑移的最大坡度角αｍａｘ、最小坡度角αｍｉｎ、沉积物输入速率η等参数。αｍａｘ、αｍｉｎ控制了一个自发振动系统，△α（αｍａｘ－αｍｉｎ）、Ｋ、η一起控制了重力流形成的振动周期     

楔形双滑面稳定性动态分析及其在削坡治理中的应用──以神府-东胜和准格尔煤田露天采场斜坡为例

本文提出了可以连续地计算任何坡高不同坡角的双滑面楔形四面滑体的稳定系数，以便求得某一稳定性系数的最优化坡角。本方法经神府－东胜及准格尔煤田采场斜坡验算，得知两煤田采场斜坡还有较大的安全储备。     

Study on crust-mantle tectonics and its velocity structure along the Beijing-Huailai-Fengzhen profile

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利用积分方程法计算双侧向测井仪的井眼校正曲线

对电测井积分方程中的各积分项进行了理论推导，利用任意闭合曲面对曲面外一点所张立体角为零的特点将电势积分项由对柱体侧面的积分转化为对柱体底面的积分，从而使在纵向采用线性插值条件下给出了电势积分项的解析解．对电流积分项进行了化简，使之由曲面积分化为一维数值积分．利用所得结果计算了双侧向测井仪的井眼校正曲线．     

The relationships between earthquakes and positions of the sun and moon (II)

This paper deals with the distributive characteristics of the occurrence time of earthquakes with respect to the aftershock sequences of strong earthquakes. The distribution of lunar and solar local hour angles at the time of commencement of moderate and strong aftershocks indicates that the time of commencement of moderate and strong aftershocks is modulated by the positions of the sun and moon and then the earthquake-restrained time zones exists also. In this paper the differences of earthquake-restrained time zones between the preshock sequences and the aftershock sequences are compared, and the possible mechanism is analyzed preliminarily. And the possible maximum scope of accuracy in predicting the occurrence time of an earthquake is determined as well. This paper is supported by the Eight Five Year Target of the State Seismological Bureau, China.     

Complexity and scale in geomorphology: Statistical self-similarity vs. characteristic scales

Two models of the relationship between complexity and scale of geomorphic lines are compared, one based on statistical self-similarity (in which complexity is invariant for some range of scale), and the other on the concept of characteristic scales (in which complexity changes continuously with scale). Two corresponding techniques are used in the comparison, fractal analysis utilizing the divider method, and an angle measure technique. These techniques are applied to three types of coastlines: fiord, volcanic, and tectonic, in order to ascertain which model, statistical self-similarity or characteristic scales, is more useful in understanding variations in coastline complexity for scale. Apparently linear log-log plots of number of steps against steplength produced by fractal analysis display slight but significant curvature. Upon closer examination, it is determined that using fractal dimension to compare even the same types of features is unreliable because of the dependency of fractal dimension on scale of measurement, even if the same steplengths are used throughout the study. These results are corroborated by the use of the angle measure technique, a method based on measuring angles between points along a digitized line. It is concluded that the coastlines examined display no evidence of statistical self-similarity and that the characteristic scales model is more useful in investigating complexity and scale in geomorphology.     

电沉积参数对Cr2O3超疏水膜层表面形貌和润湿性的影响

采用电沉积法在碳钢片表面制备Cr2O3微纳膜层,并用硬脂酸对其进行表面修饰降低其表面能。通过单因素法依次优化电流密度、铬酸浓度、极间距和电沉积时间,并分析所得Cr2O3超疏水膜层的表面形貌和润湿性。当电流强度为4A、铬酸浓度为1.5 mol/L、极间距为5 mm及电沉积时间为1 h时,经硬脂酸修饰后Cr2O3膜层的超疏水性能优异,其静态接触角达到153.52°且滚动角为2.17°。