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101.
102.
基于等高线数据的地性线追踪技术研究 总被引:11,自引:0,他引:11
通过研究特征点的提取技术和建立系统的特征点匹配的数学模型,研究了基于矢量等高线数据的地性线的自动追踪技术,利用所述方法,提取的特征点完整,准确;理论和实验表明,所建立的数学模型简捷,实用,有可靠的数学理论基础,且地性线追踪效果良好。 相似文献
103.
低序次断裂是地壳变形的直接产物,具有丰富的构造变形信息,经过转换的低序次构造。形式多样,图案复杂,是构造研究的重要对象,也是地表稳定性研究的重要基础。利用香港地区航空雷达图像资料,提取其中低序次构造的弱信息,建立转换变形模型,以分析区内不稳定地表的构造背景。区内北东向断裂是主要构造,其右行剪切形成一系列低序次R面,P面,R^1面构造,在雷达图像上表现为线性弱信息并且与微地貌发育有关。利用线性构造增强,提取技术和低序次构造组合分析方法,结合野外地质调查,确定马鞍山地区EW向的张性破裂是NE向张剪断裂的转换,是造成马鞍山滑坡的重要地质因素。 相似文献
104.
铜山铜矿床矿化类型可划分为层状含铜黄铁矿型,含铜角砾岩型,含铜夕卡岩型和含铜班岩型,控矿因素为地层,岩浆岩及构造,其中层间断裂与接触带构造是主要的容矿构造,铅,硫,氢,氧同位素特征及成矿温度研究表明矿物质和热液主要来源于铜山岩体,矿床成因为层控夕卡岩型铜矿床。 相似文献
105.
106.
Velocity and absorption tomograms are the two most common forms of presentation of radar tomographic data. However, mining personnel, geophysicists included, are often unfamiliar with radar velocity and absorption. In this paper, general formulae are introduced, relating velocity and attenuation coefficient to conductivity and dielectric constant. The formulae are valid for lossy media as well as high-resistivity materials. The transformation of velocity and absorption to conductivity and dielectric constant is illustrated via application of the formulae to radar tomograms from the Hellyer zinc–lead–silver mine, Tasmania, Australia. The resulting conductivity and dielectric constant tomograms constructed at Hellyer demonstrated the potential of radar tomography to delineate sulphide ore zones. 相似文献
107.
In this article, the phenomenon of generation of corona discharges on the tops of trees and plants is described. In the first part of the text, the conditions for generation of this electric field which leads to formation of corona discharge and transfer of electric charge between atmosphere and Earth, are discussed. Experimental results of the onset voltage and its dependence on the discharge parameters are presented. The coincidence between released species from corona burning point and surrounding atmosphere is also discussed. Equation for the calculation of critical intensity of the electric field and onset voltage in dependence on radius of the tip are also discussed and compared with experimental data and equations for current–voltage characteristics are described. The attempt to explain differences between theory and measured data is proposed. 相似文献
108.
109.
M. I. Todorovska S. S. Ivanovi M. D. Trifunac 《Soil Dynamics and Earthquake Engineering》2001,21(3):705
For transient, high frequency, and pulse like excitation of structures in the near field of strong earthquakes, the classical design approach based on relative response spectrum and mode superposition may not be conservative. For such excitations, it is more natural to use wave propagation methods. In this paper (Part I), we review several two-dimensional wave propagation models of buildings and show results for theoretical dispersion curves computed for these models. We also estimate the parameters of these models that would correspond to a seven-story reinforced concrete building in Van Nuys, California. Ambient vibration tests data for this building imply vertical shear wave velocity βz=112 m/s and anisotropy factor βx/βz=0.55 for NS vibrations, and βz=88 m/s and βx/βz=1 for EW vibrations. The velocity of shear waves propagating through the slabs is estimated to be about 2000 m/s. In the companion paper (Part II), we estimate phase velocities of vertically and horizontally propagating waves between seven pairs of recording points in the building using recorded response to four earthquakes. 相似文献
110.
A new formulation is proposed to model pounding between two adjacent structures, with natural periods T1 and T2 and damping ratios ζ1 and ζ2 under harmonic earthquake excitation, as non‐linear Hertzian impact between two single‐degree‐of‐freedom oscillators. For the case of rigid impacts, a special case of our analytical solution has been given by Davis (‘Pounding of buildings modelled by an impact oscillator’ Earthquake Engineering and Structural Dynamics, 1992; 21 :253–274) for an oscillator pounding on a stationary barrier. Our analytical predictions for rigid impacts agree qualitatively with our numerical simulations for non‐rigid impacts. When the difference in natural periods between the two oscillators increases, the impact velocity also increases drastically. The impact velocity spectrum is, however, relatively insensitive to the standoff distance. The maximum relative impact velocity of the coupled system can occur at an excitation period Tn* which is either between those of the two oscillators or less than both of them, depending on the ratios T1/T2 and ζ1/ζ2. Although the pounding force between two oscillators has been primarily modelled by the Hertz contact law, parametric studies show that the maximum relative impact velocity is not very sensitive to changes in the contact parameters. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献