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GIS (Gas Insulated Switchgear) is extensively used in the power grid to switch lines and protect the system. The higher requirements are proposed due to the increasing voltage level when comes to its internal over-heating problems. In this paper, the temperature rise of 40.5kV high voltage switchgear is researched with the help of ANSYS APDL and CFX. Firstly, the electromagnetic loss and generated...
Coal moisture automatic online control has important practical significance on the actual production, which is realized by analyzing and modelling the existing coal moisture control system. In this research, experimental training data are used RHM (Resembling by Half-Mean) to exclude abnormal values. The study adopts RBF (Radical Basis Function) neural network for coal moisture control system to model,...
The MapReduce programming model has introduced simple interfaces to a large class of applications. Its easy-to-use APIs and autonomic parallelization are attracting attentions from scientific community. However, current MapReduce-style scientific frameworks focus more on the most popular MapReduce applications that can be easily partitioned and involve little communication across map or reduce tasks...
This paper first introduces the MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system model, and then studies several classical channel estimation algorithms: LS(Least Square) algorithm and LMMSE(Liner Minimum Mean-Square Error) algorithms. Finally, based on the Jacobi iterative algorithm for solving linear equations, the original LMMSE algorithm has been improved...
A system-level model of double-fed induction generator wind turbine is established based on AMESim in this paper. The sub-models are wind, drive train, double-fed induction generator (DFIG) and control models. A gearbox in details is modeled according to the practical structure. And the total wind energy generation system can be simulated well on the platform of AMESim.
The success of current trust and reputation systems is on the premise that truthful feedbacks are obtained. However, without appropriate mechanisms, silent and lying strategies usually yield higher payoffs for peers than truthful feedback strategies. Thus, to ensure trustworthiness, incentive mechanisms are critically needed for a reputation system to encourage rational peers to provide truthful feedbacks...
In speech enhancement based on wavelet package, a new concept of time-frequency thresholding and the corresponding algorithm are presented. Based on the masking properties of human auditory system to wavelet denoising, the threshold is modulated to vary with the time-frequency characteristic of the speech's pre-estimate, but not merely the time-variant information as has been adopted in former researches...
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