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From the point of spatial distribution of mineral assemblage of a hydrothermal sulfide congeries, the upper part is dominated with chimney, and the lower part with massive sulfides followed by stockwork sulfides in the deep part. This seems to be a common feature of various hydrothermal active areas.

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And the direction query efficiency based on multi-approximate index is compared with that based on taditional external approximation index. 2 The algorithms of nearest neighbor and reverse nearest neighbor about point, line and ploygen based on multi-approximate index are proposed after the virous methods of distance measure are discussed in detail. And the query efficiency of NN and RNN based on multi-approximate index is compared with that based on taditional external approximation index. 3 The basic concept of semi-join and the strategy of distance-direction semi-join are introduced. And the model of distance relationship, direction relationship and the bounding for spatial object are discussed. Then the method is presented about how to implement the query of distance-direction semi-join, and the efficiency of the algorithm based on multi-approximate index is compared with that based on taditional external approximation index.

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From point of view of Fourier theory, an optical system behaves as a low-pass filter which debars spatial frequency information about the object beyond the diffraction limit cut-off frequency.

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Fault episodic activities controlled the thickness and spatial distribution of each strata, which induced that sedimentary center migrated clockwise with the area near to Wuhaozhuang fault zone as start point. The type of fault activities controlled the overlapping mode of sediments, which could be indicated by that the progradational sequence was developed mainly during the period of extensional fault activities and the retrograding sequence was developed mainly during the period of compressive fault activities.

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Through "a point to connect to promote belt line in order to bring Hing side" of the spatial development pattern of radiation and driven 100 kilometers from the coastline within the scope of the development of the coastal economic belt.

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In this paper,the spatial shape of the construction entrance as the paper's breakthrough point,for the paper, by analyzing relationship between the building entrance and the climate,building strategy and specific methods to the design of climate buffer space of construction entrance,to make better use of the characteristics of natural c ...

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Based on the relevant movement between hard shaper cutter and grinding wheel, the movements of grinding wheel are studied. The shaping grinding point and the shaping grinding edge are made up with. In order to easily compare when shaping errors and cutting edge"s angles are the most excellent, uniform expressions for convex curved rake face of hard shaping cutter and spatial cutting edge curve are separately developed. The distributions of new profiling cutter"s shaping errors and cutting edges angles are analyzed. The relevant grinding wheel and cam are designed. Due to this paper, a new profiling hard shaping cutter has been manufactured successfully. At last experiments are made to test the performance of hard shaping cutter and all kinds of precision of hard gear.

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Five class objects of geodetic data are determined. They are spatial datum object, point object, network object, intersection object and collection object. The object-oriented geodetic data model is established in the paper.

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GIS technology can provide some spatial analysis tools for extracting some of these parameters such as the manning coefficient and calculating the average ground datum of internal point of every mesh unit and the mesh nodes.

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