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Understanding of the propagation of ultrasound through a bubbly medium is a challenging task because of the nonlinear dynamics of the bubbles and their effect on the attenuation and sound speed of the medium. The majority of the studies on this subject apply linear models, which will generate inaccurate results, especially at higher-pressure excitations. These studies have also ignored the effect...
Understanding of the propagation of ultrasound through a bubbly medium is a challenging task because of the nonlinear dynamics of the bubbles and their effect on the attenuation and sound speed of the medium. The majority of the studies on this subject apply linear models, which will generate inaccurate results, especially at higher-pressure excitations. These studies have also ignored the effect...
To save energy, solar vehicle have come into being. Therefore, the study of photovoltaic maximum power point tracking is necessary. Traditional photovoltaic maximum power point tracking (MPPT) algorithm such as constant voltage algorithm can not track the maximum power point quickly and accurately. Operation voltage can not be adjusted rapidly with environmental changes when using conductance adding...
In this paper, the precision and adaptability of the grey GM(1,1) model is analyzed in details and improved by initial value setting adjustment. The selection of initial value has an important effect on the GM(1,1) model's precision. So, this paper deals with the GM improvement in modification of initial value, and obtains great improvement in forecasting precision. Finally we validate the practicability...
Based on Nanjing NO.1 project Gulou-Xuwu subway practice, this paper focus on subway construction technology under great and changeable section, soft plastic-flow stratum condition. Results indicate that it is effective on controlling the ground drop when adopting sidesteps method with shed advancing and injecting.
In this study, we establish a numerical model and use computational fluid dynamics (CFD) analysis to measure peak pressure on the surface of filter bag. The numerical results are in good agreement with the experimental data during the pulse cleaning process. Peak pressure on the surface of filter bag, pressure rise rate and maximum reverse acceleration are used as evaluation indicators of bag-cleaning...
In order to solve a series questions at present existing in machining technology of the disc with complex shape such as long process flow, great affects among working procedures and high cost, according to the outline of the part, the drawing process has been finished by one process instead of two, which is on the basic of the finite element numerical simulation and the experiment on simple dies....
In this letter, we derive an achievable rate region of a two-user cooperative multiple-access (CMA) channel where one user performs decode-and-forward (DF) cooperation and the other user performs Wyner-Ziv-type compress-and-forward (CF) cooperation. The proposed rate region is achieved using a communication scheme that applies block Markov coding at each user and backward decoding at destination....
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