Papers by Keyword: Attenuation Rate

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Authors: Kazuya Mori, I. Torigoe, M. Tokunaga, S. Hatanaka, Y. Shiramizu
349
Authors: V.V. Bulkin, I.N. Kirillov
Abstract: In the article is considered the system of monitoring of acoustic pollution of the local industrial areas, providing noise control and prediction of the nature of its distribution in the local industrial zone and into the residential area. The system of control includes the control channel of the level of acoustic noise (passive channel), the channel for receiving the meteorological information (active channel), the system of data processing and forecasting.
686
Authors: Jian Wang, Bao Gui Wang, Gang Tao
Abstract: For understanding the dynamic behavior of open and closed foam subject to a shock wave, this paper through experiments, to gain a deeper understanding of the incidence, reflection and transmission of a shock wave when it interacted with cellular foam. Moreover, by analyzing the loss of the peak overpressure and positive impulse, we were able to respectively know the positive impulse of the incidence, reflection and transmission shock wave. The experimental results indicated that the attenuation capability for foam to the shock wave was caused by the internal friction and deformation of solid phase, which would absorb the energy of the shock wave. From the results we gain an understanding that the mechanical phenomenon of open foam to shock wave are not fully consistent with those of closed foam , while the attenuation of open foam to shock wave is more effective than that of closed foam.
445
Authors: Rong Wang, Hai Bo Ma, Bin Qu
Abstract: This research adopts comprehensive evaluation to evaluate lifetime of LED light source for lighting system. By the method, under the condition of LED light source working outside, the situations of LED light source lifetime are analyzed with attenuation rate of illumination got from illumination data of LED light source in practical work. The real lifetime characteristics and real life curve of the LED light source are obtained eventually.
635
Authors: Jie Zhou, Gang Tao
Abstract: For understanding the dynamic behavior of watery cellular foam subject to a shock wave, this paper through experiments, to gain a deeper understanding of the incidence, reflection and transmission of a shock wave when it interacted with watery foam. Moreover, by analyzing the loss of the peak overpressure and positive impulse, we were able to respectively know the positive impulse of the incidence, reflection and transmission shock wave. The experimental results indicated that the attenuation capability for watery foam to the shock wave was caused by the internal friction and the water atomization, which would absorb the energy of the shock wave. Therein, the higher percentage of water in the cellular foam, the more obvious attenuation phenomenon for the shock wave was presented. However, the mechanical processes of cellular foam with different water percentages subject to the shock wave were not completely consistent.
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