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Light scattering by horizontally oriented square pyramid in the Wentzel–Kramers–Brillouin approximation

Tari El Mostafa, Bahaoui Abdelhadi, Lamsoudi Redouane, Khouilid Mohammed, Ibnchaikh Mohamed

Optica Applicata

2022

Vol. 52, nr 2

213--228

In this research, we studied the sensitivity of the form factor of a pyramidal ice crystal in the Wentzel–Kramers–Brillouin (WKB) approximation to its geometrical characteristics: the shape, spatial orientation, aspect ratio and size parameter. Using the WKB method, we derive an analytical formula of the form factor of horizontally oriented square pyramid. We will begin this work by applying the WKB approximation to the case of a particle which rotates about its main axis. Then, we will move to deal with the case of a particle which rotates about an axis perpendicular to its main axis in a future work. In addition, the coefficient of extinction is also given. To illustrate our analytical results, some numerical examples are analyzed.

Hull resistance of an inland waterway vessel in model scale and in full scale

Tabaczek T., Zawiślak M.

Polish Maritime Research

2018

S 1

80--84

Data from model tests of an inland waterway vessel in shallow water have been used by the authors to prepare the resistance prediction in full scale. The common ITTC-1978 extrapolation procedure was applied using form factor determined according to the Prohaska method and, separately, by fitting the approximation function to resistance data. At the same time a series of CFD computations of ship flow has been carried out in model scale and in full scale, with double-body model as well as including the effect of free surface. The results of computations were used to determine total resistance and form factor. The values of form factor determined using different methods are similar and relatively high in comparison to values being applied to conventional sea going ships. Resistance prediction according to the ITTC-1978 with form factor was compared to prediction without form factor. The relative difference of resistance amounts 28% at ship speed of 10 km/h and 24% at ship speed of 12 km/h.

Sposób oceny wpływu przekładnika prądowego na współczynniki określające jakość energii elektrycznej

Kaczmarek M.

Przegląd Elektrotechniczny

2013

R. 89, nr 3a

83--85

Przedstawiony w artykule sposób oceny wpływu przekładników prądowych pracujących, w układach pośrednich, na wartości współczynników określających jakość energii elektrycznej umożliwia obliczenie maksymalnych wartości błędów wyznaczania wybranych współczynników charakteryzujących odkształcenie prądu określonych dla strony wtórnej zastosowanego przekładnika prądowego.

Presented in the paper method for determine the influence of current transformers on estimated power quality factors enable calculation of the maximal changes in values of selected factors used for characterization of signals distortion caused by usage of the current transformer.