脉冲超声波测井仪

一、引言超声测井是一种新的地震測井法,它是利用超声波来研究小間隔內（1-2米）鈷井剖面岩层的物理机械性貭。近年来,由于石油探測事业发展的需要,这种方法在地球物理勘探和地球物理测井中受到了广泛的注意。根据超声測井的試驗和应用的結果看来,这种方法可以簡捷、經济、精确、詳細地測定出岩石的物理机械性貭（纵波和横波的波速,波的吸收系数等等）及其随深度的变化。     

重视实践勇于创新的中国古代科学家张衡

当前,我国人民在伟大领袖毛主席关于理论问题重要指示的指引下,在党的十届二中全会和四届人大提出的战斗任务鼓舞下,认真学习马克思主义关于无产阶级专政的理论,继续普及、深入、持久地开展批林批孔运动,在上层建筑其中包括各个文化领域对资产阶级。     

1966年邢台地震的地形变

1966年3月发生的邢台地震属震群型,五次大于6级的强震基本上都发生在邢衡隆起区中强烈下降的束鹿断陷内。水准测量结果说明,在地震前、地震时及地震后,断陷区都有明显的下降运动。大地测量结果证明,邢台地震是一个右旋型水平错动为主、并伴有水平方向的引张和垂直方向的下降运动,呈现出张扭性断层错动模型。在二次主震或强震的中间,水准复测结果说明:在已发生强震的震中一带强烈下沉,而可能的未来强震区有较明显的上升。邢台地震在地面垂直运动方面,地震前后大致存在四个地形变阶段,并在总体上具有同向地形变特征。     

利用地下水氡浓度异常变化预报地震的探讨

本文论述了水氡预报地震的可能性;研究了水氡异常变化的特征;讨论了排除干扰、识别异常以及预报地震的时、空、强三要素等方面的问题。     

GEOLOGICAL CONTEMPORANEITY AS VIEWED FROM THE THEORY OF RELATIVITY

Since the importance of tho iron ore resources of the contact metamorphic type in China has been well recognized by many geologists and their geological occurrence and economic prospects have been described and published in detail 1, it seems desirable to have a review of those rocks known     

COMPLETE LIST OF MEMBERS OF THE GEOLOGICAL SOCIETY OF CHINA. (SEPTEMBER 1926)

Important notice to members:- All members are earnestly requested to send to the Secretary of the Society any change of address. The     

Spatially ordered networks and topographic reconstructions

Abstract

A technique is discussed for obtaining a contour tree efficiently as a byproduct of an operational contouring system. This tree may then be used to obtain contour symbolism or interval statistics as well as for further geomorphological study. Alternatively, the tree may be obtained without the computational expense of detailed contour interpolation. The contouring system proceeds by assuming a Voronoi neighbourhood or domain about each data point and generating a dual-graph Delaunay triangulation accordingly. Since a triangulation may be traversed in a tree order, individual triangles may be processed in a guaranteed top-to-bottom sequence on the map. At the active edge of the map under construction a linked list is maintained of the contour ‘stubs’ available to be updated by the next triangle processed. Any new contour segment may extend an existing stub, open two new stubs or close (connect) two previous stubs. Extending this list of edge links backwards into the existing map permits storage of contour segments within main memory until a dump (either to plotter or disc) is required by memory overflow, contour closure, contour labelling or job completion. Maintenance of an appropriate status link permits the immediate distinction of local closure (where the newly-connected segments are themselves not connected) from global closure (where a contour loop is completed and no longer required in memory). The resulting contour map may be represented as a tree, the root node being the bounding contour of the map. The nature of the triangle-ordering procedure ensures that inner contours are closed before enclosing ones, and hence a preliminary contour tree may be generated as conventional contour generation occurs. A final scan through the resulting tree eliminates any inconsistencies.     

PAN graphs An aid to GIS analysis

Abstract

Many data structures are possible for the storage of topological information for computer-based maps. The PAN graph is here suggested as an aid in the selection of a strategy appropriate to the application. Examples are given for the mapping of triangular networks and Thiessen polygons. Application of the technique is appropriate to both education in, and design of, spatial data structures for automated cartography and geographical information systems