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Li Q.-W.,Chengdu University of Technology | Li Q.-W.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation | Li Q.-W.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Zhou H.-L.,Chengdu University of Technology | And 2 more authors.
Wutan Huatan Jisuan Jishu | Year: 2016

Compared to elastic media, the viscoelastic anisotropic media is more practical subsurface characterization in seismic exploration. In this paper mainly aimed at the Kelvin model, Derived the first order stress velocity equation from constitutive equations, geometric equations and differential equations. Then, the numerical simulation of the staggered grid finite difference is used to discrete it and research wave field characteristics and propagation of seismic waves. At the same time, the analysis of the influence of quality factor Q on the attenuation and absorption of seismic wave in amplitude and frequency. Use staggered grid algorithm would inevitably result in numerical dispersion or aliasing phenomenon in numerical simulation, and thus the correctness of the results of the numerical simulation is disturbed. In order to improve the results of numerical simulation, optimized the conventional FCT (flux corrected transport) method to suppress dispersion. Simulation examples demonstrate that the optimized FCT method is more effective than the conventional FCT method in eliminating frequency dispersion. Source


Yang J.B.,Chengdu University of Technology | Yang J.B.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Yang J.B.,Tsinghua University | Tuo X.G.,Southwest University of Science and Technology | And 10 more authors.
Nuclear Technology | Year: 2013

To improve the yield of online prompt gamma neutron activation analysis, the Monte Carlo N-Particle Transport Code (MCNP) is used to simulate the computation and analysis of the material and thickness of reflectors on both sides of the sample chamber as well as the type and thickness of the neutron-absorbing material in front of the detector. The simulation shows that the optimal thickness of the reflecting material is ∼100 mm when heavy water is added on both sides of the sample chamber and the optimal thickness of the neutron-absorbing material is ∼50 mm when polyethylene-containing boron is added in front of the detector. The experiment demonstrated that the yield of prompt gamma rays of the main elements in the cement sample increased to some extent. Source


Wang X.-B.,Chengdu University of Technology | Wang X.-B.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Luo W.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Zhang G.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | And 4 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2013

A long peroid magnetotelluric profile along the Luqu-Longmenshan-Hechuan has been finished which helps to study the crust-mantle electrical resisitivity structure in Longmenshan and its adjacent area, Institutive and reasonable 2-D inversion algorithm under sector boundary was adopted. The results of this profile has shown the crust-mantle high resistance belt in Ruergai, Longmenshan, central Sichuan and low resistance belt in Songpan from northwest to southeast. Longmenshan crust-mantle high resistance block shows up as wedge-shaped high resistance block stretching to northwest under the Longmenshan thrust belt. Due to bi-directional compression of East margin of Qinghai-Tibet plateau and upper Yangtze plate, Crust materials of Songpan-Ganzi massifs thrust to Longmenshan, and middle-lower crust and upper mantle slides toward southwest, presenting a trend that west margin of upper Yangtze plate in shape of wedge inserting into east brim of Qinghai-Tibet Plateau. It was initially thought that Songpan crust-mantle ductile shear belt is regarded as the west margin deep boundary of upper Yangtze plate since Mesozoic-Cenozoic Era. Source


Huailiang L.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Huailiang L.,Chengdu University of Technology | Xianguo T.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Xianguo T.,Chengdu University of Technology | Lili Z.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education
Sensors and Transducers | Year: 2012

It has some issues such as cable layout trouble and low efficiency to wired shallow seismograph when working in complex environment. In this paper, it takes advantage of the current non-standard wireless communication technology, and according to the requirements of distributed seismic data acquisition with multi-node and multi-parameter, a star-shaped wireless network was built which is suitable for seismic data transmission using the networking mode of multi-channel and multi-address switching, and the distributed seismic data acquisition system was accomplished which had the function of synchronous control and asynchronous transmission adopting the method of address matching identification and custom packet combination, thus the additional accessories of traditional wired seismograph was greatly reduced to improve its capacity and efficiency of construction in a harsh environment. The key technical problems and solutions of wireless seismic data transmission is analyzed in detail in this paper, and provided a reliable wireless networking method which is easy to implement and its highly efficient and stable data transport control protocol. © 2012 IFSA. Source


Wenhui Y.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Yan X.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education | Fang M.,Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education
Lecture Notes in Electrical Engineering | Year: 2013

In spatial information networks which incorporate the client side dynamic aggregation services of G/S mode, in order to construct virtual scene that serves the real world, it requires extremely high fidelity and ability of real-time interaction of the environment. When dealing with data that have diverse, complex types and tremendous scale, consistent organization, management and data processing are essential. This article centers on introducing: synthesizing virtual reality environments based on HGML, 3D terrain models and 3D entity models, which are constructed through DEM and remote sensing data, and a preliminary research of the implementation and real-time interaction of the dynamic features. © 2013 Springer-Verlag GmbH. Source

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