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In the research and development of wind turbine generator systems, it is necessary to predict the responses of the system for various wind conditions. Hence, a laboratory-size wind turbine simulator that can simulate the dynamic performances of actual wind turbine generator systems is very useful. However, there are few studies on such simulators. In this paper, a simulation method for actual MW class...
In this paper we adopt the similarity principle to study GPR response to voids under road surface or in the levees and dams by cross-examination of GPR data acquired using both high-frequency antennas on laboratory bench-size models and low-frequency antennas in the field. In physical world the similarity principle is widely used in theoretical study and engineering practice. In short, by the similarity...
Ground Penetrating Radar (GPR) is an efficient remote sensing tool for geophysical subsurface survey. These structure characteristics are recorded in radar signal profiles by means of echo detection, amplitude and phase estimation. Besides the energy attenuation and absorption of GPR EM pulse during its propagating downward direction into the ground from a transmitting antenna, the strong interferences,...
Vehicle-mounted ground penetrating radar (GPR) is an effective and rapid tool to detect railway subgrade defects. However, the signal to noise ratio (SNR) of the raw GPR data on railway subgrade is much lower than that of other detection sites. The primary noises are caused by radar wave reflections from the rails and steel-concrete sleepers. However, the rail noise is always invariant since the rails...
Previous studies have demonstrated that the radar technique is one of the most effective ways to detect human vital signs in certain circumstances. However, the problem of the complex electromagnetic environment at an earthquake disaster site has not been fully explored in the literature to date. To characterize and comprehend the electromagnetic environment in radio frequencies in a typical field...
Application of the finite-difference reverse time migration (FD-RTM) to ground penetrating radar (GPR) data may generate high-resolution imaging for complex geologic bodies. However, in conditions of complex topography, due to topographic roughness it is very difficult to get clear images of near-surface internal structure with the traditional approach of “static correction + flat datum migration”...
As se miconductor devices continue to get s maller, it is clear that quantum effects will begin to play a larger role in their behavior. Phase interference and the energy relaxation via electron-electron interactions are key quantum effects which can occur in small devices. These are studied best at low temperature where other processes are quenched. Here, we discuss these effects in graphene.
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