to simulate a new economical architecture for pem fuel cell and investigate the effectiveness of the introduced structure on the performance, computational fluid dynamics (cfd) code is used to solve the equations for a single domain of the cell namely: the flow field, the mass conservation, the energy conservation, the species transport, and the electric/ionic fields under the assumptions of st...

in this paper we will prove that if $l$ is a continuous symmetric n-linear form on a hilbert spaceand $widehat{l}$ is the associated continuous n-homogeneous polynomial, then $||l||=||widehat{l}||$.for the proof we are using a classical generalized  inequality due to s. bernstein for entire functions of exponential type. furthermore we study the case that if x is a banach space then we have tha...

We measured the angleand polarization-resolved reflection and photoluminescence spectra of ZnO inverse opals. Significant enhancement of spontaneous emission is observed. The enhanced emission not only has good directionality but can also be linearly polarized. A detailed theoretical analysis and numerical simulation reveal that such enhancement is caused by the abnormal dispersion of a high-or...

The process of data taking, reduction and calibration of near-infrared imaging polarimetry data taken with the ESO Adaptive Optics System ADONIS is described. The ADONIS polarimetric facility is provided by a rotating wire grid polarizer. Images were taken at increments of 22.5 of polarizer rotation from 0 to 180, oversampling the polarization curve but allowing the effects of photometric varia...

A new simple, fast and accurate method for liquid crystal cell twist angle and cell gap measurement was demonstrated. It is based on a real time spectral measurement of the linear polarization preservation modes. Prior knowledge of the twist angle or director orientations is not required. This method is straight forward and does not require complicated calculations or curve fitting. This system...

In this paper, we propose a novel method to recover the surface shape of transparent objects. The degree of polarization of the light reflected from the object surface depends on the reflection angle which, in turn, depends on the object’s surface normal; thus, by measuring the degree of polarization, we are able to calculate the surface normal of the object. However, degree of polarization and...

This paper gives a study of 3-D channel parameters, i.e. azimuth, elevation directions at MS (DMS), and delay. Both vertical and horizontal polarizations were transmitted and received in the measurement. By observing the azimuth power spectrum density (APSD), the analysis of the spatio-temporal channel parameters including full polarimetric behaviors was conducted. Power spectrum density (PSD) ...

Several experimental measurements are expressed in the form of one-dimensional profiles, for which there is a scarcity of methodologies able to classify the pertinence of a given result to a specific group. The polarization curves that evaluate the corrosion kinetics of electrodes in corrosive media are an application where the behavior is chiefly analyzed from profiles. Polarization curves are...