Papers by Keyword: Non-Uniform Distribution

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Authors: Hai Qian Cheng, Qing Hua Cheng, Kai Yin Zhang
Abstract: The pre-stressed friction loss formula in bending channel recommended by Bridge Rules was based on the uniform distribution hypothesis of contact pressure. From some conflicts in application of the formula, the non-uniform distribution law of the contact pressure was revealed. On the basis of elastic contact analysis, two types of non-uniform distribution hypothesis were proposed, including cosine and second-degree parabola distribution. Then the contact positive pressure expressions were derived respectively and the frictional resistance was calculated to compare with the calculated value under the uniform distribution. The results indicate that the friction resistance under any non-uniform distribution of positive pressure is less than under the uniform distribution. So the uniform distribution assumption of contact pressure does not cause Bridge Specifications formula underestimate friction loss. It is necessary to do further research on the applicability of Coulomb’s law under the contact conditions in the curved channel.
Authors: Naser Zaeri, Sami Habib
Abstract: The success of wireless sensor networks (WSN) depends on two factors: 1) how well the service area is monitored by the WSN's capability to sense the intended phenomenon, and 2) the way that the WSN communicates the sensed phenomenon for further analysis by the service center with acceptable time duration. The simultaneous optimization for both the sensing and communication problems is a grand challenge, especially when the service area is harsh and it can't be accessed easily by human. In this paper, we have proposed a non-uniform constructive scheme to sense and communicate the service area through a cell-by-cell, where each cell is selected randomly and the cells may have different sizes. The experimental results demonstrate the feasibility of the non-uniform constructive scheme in selecting and placing sensors to sense and communicate over the service area with minimal uncovered area and minimal overlapped sensors.
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