用VC++实现屏幕图形的获取与显示   总被引：2，自引：1，他引：1  

王永丽 《成都信息工程学院学报》2001,16(2):123-128

详细介绍用VC＋＋实现对屏幕图形的抓取与显示，旨在为用户提供一种方法，需要的时候可以方便、灵活地加在用户的应用软件中。  相似文献   

Time-domain dynamic analysis of dam–reservoir–foundation interaction including the reservoir bottom absorption     

Semih Küçükarslan 《国际地质力学数值与分析法杂志》2004,28(9):963-980

In this paper, time-domain dynamic analysis of dam–reservoir–foundation interaction is presented by coupling the dual reciprocity boundary element method (DRBEM) in the infinite reservoir and foundation domain and the finite element method in the finite dam domain. An efficient coupling procedure is formulated by using the sub-structuring method. The effects of the reservoir bottom absorption are included in the formulations. Sharan's boundary condition for the far-end of the infinite fluid domain is implemented. To verify the proposed scheme, numerical examples are carried out by comparing with the available exact solutions and finite–finite element coupling results for the dam–reservoir interaction. A complete dam–reservoir–foundation interaction is also studied by including the bottom absorption effects. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Magnetic induction applied to borehole deviation problems     

V. Sedlák 《Geotechnical and Geological Engineering》1993,11(1):25-35

Summary Geophysical principles have a very extensive and important application in borehole technologies. A special form of magnetometry for borehole deviation measurement in certain special cases of tunnelling and driving other underground workings is presented. The mutual position of boreholes arranged in groups, used for driving underground workings in water-bearing layers by freezing and grouting methods, is determined.  相似文献   

Investigation of long waves in the tsunami frequency band on the southwestern shelf of Kamchatka     

P. D. Kovalev  A. B. Rabinovich  G. V. Shevchenko 《Natural Hazards》1991,4(2-3):141-159

Two inexpensive cable bottom pressure stations were installed on the southwestern shelf of Kamchatka (Okhotsk Sea) in 1987 and two more in 1988 to provide longwave measurements in the tsunami frequency band, to investigate the generating mechanism of these waves, and to test the instrumentation. Microfluctuations of atmospheric pressure were recorded simultaneously. Two cable lines were torn off by ship anchors in March 1989 but others are still working in spite of highly dynamic activity on beaches and in hard ice regimes. Careful data analysis of two months of observations (September–October, 1987) showed that: (1) the atmospheric spectra were very stable and monotonic in the period range 2–50 min and corresponded to a power law of ^–2.3, (2) the direct generation of long waves by atmospheric pressure fluctuations was negligible, (3) there was high correlation between background longwave oscillations and sea state, (4) the structure of the offshore longwave field was in good agreement with theoretical estimates of standing waves for a linear slope.  相似文献   

Bottom-current deposits in the Miocene–Pliocene Misaki Formation, Izu forearc area, Japan     

INTAE  LEE & YUJIRO  OGAWA 《Island Arc》1998,7(3):315-329

Sedimentary structures in the middle–late Miocene to early Pliocene Misaki Formation, Miura Group, Miura Peninsula, Central Japan, were studied, and paleocurrent data were interpreted as the result of deep-sea bottom-current flow. These current data were further compared with present-day bottom currents in the northwestern Pacific region. The Misaki Formation is thought to be a forearc deposit within the Izu oceanic arc, and is composed of thick volcaniclastic beds interbedded with siliceous biogenic clayey sediments. Sedimentary structures showing paleocurrent directions are involved in the upper part of the volcaniclastic beds, in the pumiceous beds just above the volcaniclastic beds, and in the pelagic sediments. Based on paleomagnetic data suggesting considerable rotation of the beds, all the current directions were reconstructed to their original orientation. The paleocurrents are summarized into the following three groups. The first group in the volcaniclastic beds indicates southeast-directed paleocurrent directions. The second group in the upper parts of volcaniclastic beds and in some pumiceous beds exhibits a southwest- and northeast-directed paleoflow. The third group usually observed in the pumiceous beds with parallel lamination displays a northwest- or southeast-directed paleocurrent. The origin of each group's paleoflow direction is attributed to turbidity current, internal tidal current, and contour current influences, respectively. Present-day observations of the deep-sea northwest Pacific suggest that most of the bottom-current indicators in the Misaki Formation are related to North Pacific Deep Water, possibly Antarctic Bottom Water as well as a combination of tidal and local effects. It is concluded that the beds of the Misaki Formation were deposited in the proto-Sagami basin ca 9 Ma and were formed under weak bottom currents in a wide and flat basin during colder climatic conditions, whereas the beds dated at ca 6 Ma were deposited under strong bottom-current flow, and were then accreted to the Honshu arc.  相似文献   

Stress orientation and tectonic regime in the northwestern Valencia Trough from borehole data     

Axel Schindler  María-Jos Jurado  Birgit Müller 《Tectonophysics》1998,300(1-4):63-77

The orientation of the maximum horizontal stress S_H is obtained from the analysis of borehole breakouts, covering a depth range from 300 to 3415 m (below sea level) in twelve offshore exploration wells in the northwestern Valencia Trough. The orientation of S_H is roughly coincident with the strike of major extensional structures. From N to S it changes counterclockwise from a NE–SW orientation to a N–S orientation. Estimates of the tectonic regimes indicate that the area is characterised predominantly by normal-faulting with a strike-slip component. Both the stress orientations and the tectonic regimes are consistent with neotectonic studies in the nearby Catalan Coastal Ranges. An established method of estimating the tectonic regime by Moos and Zoback (1990) was modified by the inclusion of a nontrivial cohesion, but this changes the results insignificantly.  相似文献   

Quantification of Natural Fracture Surfaces Using Fractal Geometry   总被引：3，自引：0，他引：3  

Kayhan Develi  Tayfun Babadagli 《Mathematical Geology》1998,30(8):971-998

The purpose of this paper is to present an extensive evaluation of the methods to calculate the fractal dimension of natural fracture surfaces. Three methods; variogram analysis (VA), power spectral density (PSD), and roughness-length method (RMS) are applied to 2-D surface data (PSD) and 1-D profiles (VA and RMS) extracted from the surface data of 54 mm diameter crystallized limestone samples. Surface topography of the samples is quantified through a newly designed fully automated device. Before the application, self-affinity of the surface roughness and the applicability of these methods are validated using synthetically generated fractal surfaces. Fractal dimension values of the profiles are obtained as between 1 and 1.5 with a few exceptions. VA and RMS methods yield consistent fractal dimensions while the PSD values are lower than those of the other two methods. In terms of practical applicability, the VA is found more convenient than other two methods because there still exists shortcomings with the PSD and RMS methods due to difficulties in the mathematical analysis of the plots whose slopes are used in the computation of fractal dimension. However, it is observed that the data of limited size fracture surfaces are convenient for fractal analysis and the results are promising for further applications if the fracture surface size is restricted like cores recovered from deep boreholes.  相似文献   

用PLD器件设计任意地址范围译码器的简便方法     

周立 《地球科学与环境学报》1998,(Z1)

本文提供一种用ＰＬＤ器件设计任意地址范围译码器的简便方法。该方法给出了利用地址区间边界值直接写出地址译码逻辑式的三个设计规则和为进一步简化设计过程的两个补充设计规则。本设计方法对于用ＦＭ软件进行ＰＬＤ器件开发非常方便和实用。  相似文献   

The broad-band fractal nature of heterogeneity in the upper crust from petrophysical logs   总被引：2，自引：0，他引：2  

Sean Dolan  Christopher Bean  & Bruno Riollet 《Geophysical Journal International》1998,132(3):489-507

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Variability of geophysical log data and the signature of crustal heterogeneities at the KTB   总被引：2，自引：0，他引：2  

Sabrina Leonardi  & Hans-Joachim Kümpel 《Geophysical Journal International》1998,135(3):964-974

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