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	1. Numericle simulation of the formation of linear dunes
	Zhang Ruyan,Luo Chunmei
	Earth Science 17 October 2010
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	Abstract:Three-dimensional flow above the sand dunes have been studied numerically by using Large-Eddy Simulation (LES) method. In the flow direction and span direction cyclic boundary conditions are imposed for velocity and pressure. The movement of the sand which is known as the elemental types of desert have been investigated. The numerical method employed in this study can be divided into three parts: (i) calculation of the air flow above the sand dunes using standard MAC method with a generalized coordinate system; (ii) estimation of the sand transfer caused by the flow through the friction; (iii) determination of the shape of the ground. Since the computational area has been changed due to step (iii), steps (i)-(iii) are repeated until prescribed times. The simulated dunes, which is formed by two directional winds, extends at the converging direction which is known as linear dunes.
	TO cite this article:Zhang Ruyan,Luo Chunmei. Numericle simulation of the formation of linear dunes[OL].[17 October 2010] http://en.paper.edu.cn/en_releasepaper/content/4387969


	2. A fully polarimetric borehole radar based numerical modelling: fully polarimetric radar responses to synthesized fractures
	Zhao Jianguo
	Earth Science 09 July 2010
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	Abstract:A fully polarimetric borehole radar system with four combinations of dipole and cylindrical slot antennas was developed to acquire fully polarimetric data sets in drilled boreholes. To better under the fully polarimetric response to subsurface fractures with different roughness, in this study, synthetic fractures with different roughness are generated on a computer via fractal theory based simulation techniques. Quantitative assessment for the roughness of synthetic fractures is possible by use of three main parameters: the fractal dimension, the rms roughness at a reference length, and a length scale describing the degree of mismatch between the two fracture surfaces, allowing future detailed study of mechanical and transport properties of fractures and fully polarimetric radar response on them. Next, a 3D sub-grid FDTD numerical simulation is used to synthesize fully polarimetric data sets with synthetic fractures as primary reflectors. Based on the synthetic data sets, it is possible to evaluate the applicability of different radar polarimetry analysis approaches to physical characterization of subsurface fractures in future.
	TO cite this article:Zhao Jianguo. A fully polarimetric borehole radar based numerical modelling: fully polarimetric radar responses to synthesized fractures[OL].[ 9 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4378517


	3. polarimetric calibration approaches of fully polarimetric borehole radar
	Zhao Jianguo
	Earth Science 29 January 2008
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	Abstract:A fully polarimetric borehole radar system with four combinations of dipole and cylindrical slot antennas was developed to acquire fully polarimetric data sets in drilled boreholes. This system in conjunction with several radar polarimetry techniques has proved to be a good alternative to physical subsurface fracture characterization. Furthermore, we presented that such polarimetry techniques, namely Pauli decomposition, eigenvector-based decomposition, Durden-Freeman decomposition and polarimetric anisotropy parameter methods, could provide comparable performances in terms of fracture characterization and classification. Polarimetric calibration to determine a scattering matrix (Sinclare matrix) is the foremost procedure in the radar polarimetry processing chain. In this paper, we experimentally implement and evaluate two polarimetric calibration approaches, namely 1) cross-hole polarimetric calibration and 2) single-hole polarimetric calibration, utilizing a fully polarimetric data sets acquired at a specific borehole test site. Both polarimetric calibration approaches can guarantee the further implementation of radar polarimetry techniques, and especially, the single-hole polarimetric calibration will be very meaningful to practical applications
	TO cite this article:Zhao Jianguo. polarimetric calibration approaches of fully polarimetric borehole radar[OL].[29 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18471


	4. Perturbation analysis on multipole guided waves in a fluid-filled borehole surrounded by a cubic crystal anisotropic medium
	Zhang Li,Wang Kexie
	Earth Science 10 September 2007
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	Abstract:The guided waves excited by multipole source in a fluid-filled borehole surrounded by a cubic crystallographic anisotropic medium are studied by the perturbation method. The borehole-medium model has no axial symmetry and the acoustic fields inside and outside the borehole can not be studied analytically. In this Letter, the perturbation method is adopted to analyze the guided waves in a borehole surrounded by a cubic crystal medium for the first time. The cubic crystal medium is regarded as a reference unperturbed isotropic state added to the perturbation. The dispersion characteristic of Stoneley wave, Pseodu-Rayleigh wave, flexural wave, and screw wave is investigated in detail. It is found that dispersion of the guided waves excited by monopole and dipole sources does not depend on the azimuth of the source but the dispersion of screw wave excited by quadrupole source has a significant relation to the azimuth of the source. It shows that screw waves propagated along different azimuth in the borehole can be split. This is different from that in transversely isotropic medium (hexagonal crystal) which has been studied widely.
	TO cite this article:Zhang Li,Wang Kexie. Perturbation analysis on multipole guided waves in a fluid-filled borehole surrounded by a cubic crystal anisotropic medium [OL].[10 September 2007] http://en.paper.edu.cn/en_releasepaper/content/14970


	5. Using GIS to Perform Seismic Hazard Analysis
	ZHANG Baoyi
	Earth Science 10 April 2006
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	Abstract:The main characteristics of GIS, general procedures of probabilistic seismic hazard analysis and the method to realize them on MapGIS are described. A computerized application on an engineering site in the Three Gorges Dam District is presented. The graphical user interface introduced by GIS enables to handle PSHA software routines and data in a more intuitive way. Moreover, it improves the user’s capacity of cognizing the complex PSHA processing, and helps user to explore the knowledge of PSHA from geo-data.
	TO cite this article:ZHANG Baoyi. Using GIS to Perform Seismic Hazard Analysis[J].


	6. The characteristic of tsp prediction
	He Xianqi,Zhu Ziqiang
	Earth Science 15 August 2005
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	Abstract:Multi-component seismic exploration record both p-waves and shear waves,or s-waves,so it can get more information of the subsurface than convention seismic exploration.Tsp is a method of three-componet seismic survey system. it can be continuously used as an accompanying measure to the tunneling construction.
	TO cite this article:He Xianqi,Zhu Ziqiang. The characteristic of tsp prediction[OL].[15 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2660

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