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With the rapid development of urban rail transit, the velocity measurement and location technology of train has become one of the key technologies of the automatic operation control system of the train. To realize the interval of the train and safety-control of train velocity, we must first timely acquire the operation velocity and the current location of the train. The accuracy of velocity-measurement...
A theoretical analysis on a rectangular energy-trapped piezoelectric thin zinc oxide film resonator operating with thickness-extensional modes is performed in this paper. The two-dimensional scalar differential equations derived by Tiersten and Stevens are used which can describe the in-plane mode distribution. Based on the scalar equations, we construct a variational formulation which provides a...
This paper mainly analyzes the fundamental and third order thickness shear modes of z-strip quartz resonator with the scalar equations derived by Tiersten and Smythe. Effects of the mass ratio and the length of the electrode on the operation modes and resonant frequencies are also studied. Exact modes can be obtained and the results show that the operation modes without nodal lines on the electroded...
As the bandwidth of Internet rises from ISPs, the proportion of different Internet traffic and underling services have changed. There is about 20% decrease of the P2P traffic compared to an increase of more than 10% of the traffic of cyberlockers services, which are websites providing direct file download functionalities. In this paper we present a recent study over three cyberlockers: Rapidgator,...
The distributed optical voltage transformer measures voltage through the numerical integration, the choice of the integration points and weights rely on the distribution function of the electrical field. This paper presents a mathematical model of electrical field distribution in distributed optical voltage transformer through calculating electric potential. The simulation results show that the mathematical...
Super-resolution (SR) reconstruction produces one or a series of high-resolution images from a series of low-resolution images. In this paper, we apply the regularization-based SR image reconstruction method on the basis of multi-frame image SR. Fisrstly, a linear observation model is utilized to associate the recorded LR images with the unknown reconstructed HR image estimates, and we apply the bilateral...
This paper presents a DEA-MARS two-stage nonparametric model. It measures the distribution of the efficiency of the Information Technology (IT) investment in the equipment manufacturing industry and identifies the key factors that influence the efficiency of the IT investment. The measurement shows that there is comparatively large difference in the investment efficiency. The empirical research indicates...
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