Now showing items 31-40 of 1667
Closed-form evaluation of some families of definite tangent and secant integrals
(Integral Transforms and Special Functions, 2007)
Several families of definite integrals involving the tangent or secant function have been evaluated in closed form by making use of the elementary arguments. Some of them are expressible in terms of a finite combination ...
Influence of metal and ligand types on stacking interactions of phenyl rings with square-planar transition metal complexes
(Central European Journal of Chemistry, 2007)
In order to find out whether metal type influences the stacking interactions of phenyl rings in square-planar complexes, geometrical parameters for Cu, Ni, Pd and Pt complexes, with and without chelate rings, were analyzed ...
Chain length probability distribution - equivalence of ASYNNNI and 1d Ising model
(Central European Journal of Physics, 2008)
An expression for the chain length probability distribution p(l) of a one dimensional Ising chain was derived using the cluster variation method formalism, the p(l) being expressed through the pair cluster probabilities. ...
Structure and Magnetic Investigations of Ca1+xYxMnO3 (x=0, 0.1, 0.2, 0.3) and Mn4+/Mn3+ Relation Aanalysis
(Science of Sintering, 2010)
Structure and magnetic features of nanostructured materials with general formula Ca1-xYxMnO3 (x = 0; 0.1; 0.2; 0.3) were investigated. Goldschmidt tolerance factor, G, and global instability index, GII were calculated for ...
Natural radioactivity of materials used in industry and construction in Serbia
(Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, 2011)
Four different kinds of materials (feldspar, gypsum, clay and kaolin) commonly used in building construction and industry in Serbia were analyzed for their natural radioactivity, using gamma spectrometry. The radium ...
Photonica 2011: 3rd International School and Conference on Photonics
(Physica Scripta, 2012)
Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics
(Science of Sintering, 2008)
The alpha-beta phase transformation in Si3N4 was studied for seeded samples using all Y2O3-Al2O3 mixture as a sintering aid. The concentration of beta-seeds varied from 0 to 5 wt.%. The results showed that alpha-beta phase ...
Chronic social isolation induces NF-kappa B activation and upregulation of iNOS protein expression in rat prefrontal cortex
(Neurochemistry International, 2013)
Exposure of an organism to stress, results in oxidative stress and increased nitric oxide (NO) production in the brain. The role of the processes caused by chronic stress in the prefrontal cortex has not been fully ...
Crystal structure studies on plate/shelf like disodium ditungstate
(Bulletin of Materials Science, 2013)
The structure of plate/shelf like disodium ditungstate (Na2W2O7) synthesized by new method in the process of ultrasonic spray pyrolysis using acidified aqueous solutions of tungsten (VI) oxide clusters as a precursor was ...
Evanescent-wave optical gas sensor with a porous thin-film coating
(Physica Scripta, 2014)
In this paper, we present the analysis and numerical model of absorptive gas detection by an optical evanescent-wave sensor. We investigate the influence of sensor geometry and thin-film porosity on the attenuation of ...