Search
Now showing items 1-10 of 2135
Oxygen dissociation at close-packed Pt terraces, Pt steps, and Ag-covered Pt steps studied with density functional theory
(Surface Science, 2002)
Using density functional theory we have characterized O(2) dissociation on flat and stepped Pt(111) surfaces. The reactivity of the steps is significantly higher than that of the flat terraces. Inclusion of Ag monoatomic ...
Hot pressing of Y2O3 doped Si3N4 ceramics
(Materials Science Forum, 2005)
The effect of seeding on the microstructure and mechanical properties of hot-pressed silicon nitride was investigated by introducing large, elongated beta-Si3N4 particles into an alpha-Si3N4 matrix. Densification and ...
Closed-form formulae for the derivatives of trigonometric functions at rational multiples of pi
(Applied Mathematics Letters, 2009)
In this sequel to our recent note [D. Cvijovic, Values of the derivatives of the cotangent at rational multiples of pi, Appl. Math. Lett. http://dx.doi.org/10.1016/J.aml.2008.03.013] it is shown, in a unified manner, by ...
An inverse gas chromatographic study of the adsorption of alkanes on hydroxyapatite
(Journal of Materials Science, 2000)
Saturated alkanes adsorption on synthetic well-crystallized hydroxyapatite was studied by the inverse gas chromatography method, at zero coverage. Hydroxyapatite was prepared from Ca(OH)(2) and H3PO4 aqueous solutions by ...
Zn-Mn-O: Ferromagnet at room temperature
(Hemijska industrija, 2007)
Semiconductor Zn-Mn-O crystallites were synthesized by a solid state reaction method starting from the thermal decomposition of the appropriate oxalates. Samples were thermally treated in air at temperatures ranging from ...
Stress relaxation in hematite nanoparticles-polystyrene composites
(Macromolecular Rapid Communications, 2000)
The viscoelastic behavior of a polystyrene matrix filled with hematite nanoparticles was investigated using the stress relaxation method. An increase in the elastic moduli of the composites, as well as in the magnitude of ...
Rapid detection of the hypertension-associated A1166C polymorphism of the angiotensin II type 1 receptor (AGTR1)
(Genetic Testing, 2002)
Screening for polymorphisms in the human type 1 angiotensin II receptor locus (AGTR1) has led to the identification of an A1166C transversion in the Y-untranslated region. This molecular variant, C-1166, has been linked ...
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 ...
Closed-form summations of certain hypergeometric-type series containing the digamma function
(Journal of Physics. A: Mathematical and Theoretical, 2008)
Recently, interesting novel summation formulae for hypergeometric-type series containing a digamma function as a factor have been established by Miller (2006 J. Phys. A: Math. Gen. 39 3011 - 20) mainly by exploiting already ...
Biological Effects of Echinacea Purpurea on Human Blood Cells
(Arhiv za higijenu rada i toksikologiju, 2009)
The aim of this study was to investigate radioprotective properties of Echinacea purpurea tablets in vivo. We analysed lymphocyte chromosome aberrations (CA), micronuclei (MN), apoptosis of leukocytes and haematological ...