171 research outputs found
Dealumination of zeolites with volatile reagents : Modification of the adsorption properties of Hungarian natural zeolites with phosgene
Poisoning with sodium of the acid site activity of a bifunctional Ni○HNaY type zeolite catalyst
Numerical differentiation methods for the logarithmic derivative technique used in dielectric spectroscopy
In dielectric relaxation spectroscopy the conduction contribution often hampers the evaluation of dielectric spectra, especially in the low-frequency regime. In order to overcome this the logarithmic derivative technique could be used, where the calculation of the logarithmic derivative of the real part of the complex permittivity function is needed. Since broadband dielectric measurement provides discrete permittivity function, numerical differentiation has to be used. Applicability of the Savitzky-Golay convolution method in the derivative analysis is examined, and a detailed investigation of the influential parameters (frequency, spectrum resolution, peak shape) is presented on synthetic dielectric data
Investigation of the skeletal isomerization of cyclopropane on Na y modified by elementary Na
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