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Electricity prices have rather complex features such as high volatility, high frequency, nonlinearity, mean reversion and non-stationarity that make forecasting very difficult. However, accurate electricity price forecasting is essential to market traders, retailers, and generation companies. To improve prediction accuracy using each model’s unique features, this paper proposes a hybrid approach that...
Electromagnetic acoustic transducer (EMAT) is used for rail base flaw detection. The bidirectional radiation pattern of Shear Vertical wave (SV-wave) EMAT limits the accuracy and efficiency of the transducers. In view of this problem, a method of generating unidirectional focusing SV wave is brought up by a unidirectional line-focusing SV-wave EMAT. A 2D finite element model is built to demonstrate...
A series of coordination polymers, namely, {[Co(H2ttac)(phen)2]4H2O}n (1), {[Zn(H2ttac)(phen)2]4H2O}n (2), [Cu(H2ttac)(phen)]n (3), [Zn2(ttac)(DMZ)H2O]n (4), and [Cd(ttac)(phen)H2O]n (5)(H4ttac = 4,5-di(3'-carboxylphenyl)-phthalic acid, phen = 1,10-phenanthroline, DMZ = Dimidazole) have been prepared under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, and single...
In this article, the queuing theory is applied to study the problem of journey arrangements. Primarily, with the analysis of stochastic processes, we draw the conclusion that the arrival of tourists conforms to the Poisson distribution and the camping time also complies with the general independent and identically distributed law. As each camp can be seen as the selectable service counter, we determine...
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