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《地质学报》1940,20(1)
From what we have seen during an area excursion in Lushan under theguidance of Proressor J. S. Lee we are led to belief that glacial features anddeposits can hardly be absent from the high-lying areas in western Hupeh. Ourreasoning is based on the similarity of the prevailing physiographic conditions and 相似文献
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正 With 1 Plate. INTRODUCTION During the last five years, evidence of Quaternary glaciation has been gathered by different geologists from Hupeh, Hunan, Kuangsi, and Sikang. H. von Wissmann, in his paper on the Pleistocene Glaciation in China, has made 相似文献
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Brian LISTER 《Geostandards and Geoanalytical Research》1984,8(2):171-172
It is well known that the mean can be an unsatisfactory estimator of a true value if data are a poor approximation to a normal distribution or are too few in number for a normal distribution to be adequately delineated. Unfortunately, this knowledge is not always implemented in the evaluation of analytical data. The median may be used occasionally because it is recognised to be less affected by discrepent data. However, there are other 'robust' estimators which can be better than the simple median. This note complements a previous paper by the writer (1). 相似文献
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Matheron (1971) proposed an approximation of the extension variance in IR. We propose in this note an extension of this formula in IR 2 , based on a MacLaurin formula. Its application is shown in an example, the estimation of the maximum depressional storage of a soil surface. 相似文献
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S xxxV Suryanarayana Rao S Murali V L S Bhimasankaram 《Journal of Earth System Science》1981,90(1):75-83
A new variant of the four-electrode system is proposed for geophysical resistivity investigations, particularly for profiling over conductive bodies. Model tank resistivity profiling experiments with Wenner, Schlumberger and the proposed T-shaped four-electrode arrays were carried out over a thin conducting vein type model to evaluate the efficacy of the new array. The proposed array appears to possess a larger response, a greater depth of investigation and a higher vertical resolution in detecting conducting bodies, as compared to the two-conventional arrays. 相似文献
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正 As stratigraphical data regarding breaks between the Triassic formations have accumulated as a consequence of recent research in the southern and western parts of Kuangsi, the appearance of a third note on the stratigraphical unconformities in this province to supplement previous papers on the sub 相似文献
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岩石节理的渗流广义立方定理 总被引:29,自引:5,他引:29
首先讨论了岩石节理的渗流立方定理及其适用条件,然后从渗流与变形耦合的角度,论述了节理的开度性质,并提出了适用于一般节理的渗流广义立方定理,最后用有限元数值模拟方法验证了广义立方定理。 相似文献
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构造活动和气候变化的共同作用对象是地球表面,是通过不同的物理、化学和生物过程完成的.构造活动通过所形成的地形地貌影响到区域和局部地区的气候;而气候变化的反馈作用表现为风化、剥蚀夷平地形来促使高原和造山带均衡上升.列举了目前国内外重点研究的地貌单元实例,如地峡、青藏高原、安第斯山脉、湖盆、河流和海岸线(台地),介绍了国内外在该领域的研究动态.指出耦合系统的研究需要多学科交叉融合,地表地形是研究耦合系统的关键切入点,能精确定量测量地表地形的仪器设备和高精度的年代学方法也是不可缺少的.耦合系统的研究可以分为:构造事件时间序列、气候时间序列、地形演化的定量研究,以及耦合系统模式的建立. 相似文献
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Matheron (1971) proposed an approximation of the extension variance in IR. We propose in this note an extension of this formula in IR
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, based on a MacLaurin formula. Its application is shown in an example, the estimation of the maximum depressional storage of a soil surface. 相似文献
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A Shear Model Accounting Scale Effect in Rock Joints Behavior 总被引:1,自引:0,他引:1
F. Vallier Y. Mitani M. Boulon T. Esaki F. Pellet 《Rock Mechanics and Rock Engineering》2010,43(5):581-595
Understanding the scale effect on the mechanical behavior of a single rock joint is still very important in rock engineering.
Rock joints can be classified into three different categories depending on their scale: the “micro scale” which is the scale
of the asperities; the “meso scale” is the scale of the specimens tested in laboratory; and the “macro scale” which is the
scale of the rock mass. The purpose of this paper is to propose an effective way to model rock joints at both the meso and
macro scale. An original constitutive mechanical model, in which parameters are deduced from experimental results, has been developed.
This model is then extended to simulate the discontinuities occurring at a larger size. At the macro scale, the constitutive
modeling was carried out for both small and large relative displacements. Large displacements lead to substantial changes
in dilation. For both cases, the peak shear stress vanishes for joints longer than 2 m. 相似文献
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INTRODUCTIONThemiddleandlowerreachesofChangjiangRiverareoneofthemainregionsinChinawhichischaracteristicofthewidespreaddistrib... 相似文献