Abstract Layered oxychalcogenide Sr 2 ZnCu (S 1- x Se ) O compounds were synthesized via a solid-state reaction. Density functional theory calculations indicate different valence band maximum, was composed of Cu 3 d –Se 4 p , while S dominated by the Zn –O hybrid orbital. Band gap decreased as Se-containing is increasing, from 2.5 eV to 2.2 eV. In contrast, electrical conductivity Se-substitute...

The Thriposha programme is a community-level nutrition intervention in Sri Lanka that provides a combination of energy, protein and micronutrients as a 'ready-to-eat' cereal-based food. We measured the bioavailability of Fe and Zn from Thriposha formula at two different molar ratios of Zn:Fe in order to determine the effect on Fe and Zn absorption. Children 4-7 years (n 53) were given a meal pr...

Lepidocrocite was synthesized from the oxidation of FeC12 solutions with and without soluble Si and at various Fe(II) concentrations and pH. Pure well crystallized lepidocrocite was only obtained if COz was excluded (to prevent goethite formation) and if pH was kept between 5 and 7 (to prevent maghemite and ferrihydrite formation), Si in solution prevented crystallization of lepidocrocite with ...

We discuss the iron and nickel properties in the nuclear X-ray reflecting region of the Circinus Galaxy, studied with XMM-Newton. The main results are: a) from the depth of the Fe Kα edge, a value of AFe=1.7 in number with respect to the cosmic value (as for Anders & Grevesse 1989) is measured, if the (not directly visible) illuminating spectrum is assumed to be that measured by BeppoSAX. If th...

Highly ordered TiO2 nanotube (TNT) arrays were successfully synthesized by the combination of soft and hard templates. In the fabrication of them, anodic aluminum oxide membranes act as the hard template while the self-assembly of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) complexed with titanium-tetraisopropoxide (TTIP, the precursor of TiO2) provides the soft template to control the gr...

The adsorption performance of Fe/ZSM-5 catalyst has been investigated in the SCR of NOx with propylene as the reducing agent. Freudlich equation was found to fit the adsorption isotherm satisfactorily if the system dispersion is considered. Fe/ZSM-5 catalyst showed reasonable NO adsorption capacity. The study on the influence of reaction temperature, gas space velocity and gas composition on th...

BACKGROUND The purpose of this study was to evaluate the levels of zinc (Zn), copper (Cu), iron (Fe) and zinc/ copper ratio in the serum of patients with cutaneous leishmaniasis in Qom Province, center of Iran. METHODS Serum levels of zinc and copper were determined by flame atomic absorption spectrophotometer and serum iron concentration was measured by using an Auto Analyzer. The study grou...

10" The Earth’s iron-rich inner core is seismically anisotropic, which may be due to the 11" preferred orientation of Fe-rich hexagonal close packed (hcp) alloy crystals. Elastic anisotropy in 12" a hexagonal crystal is related to its c/a axial ratio; therefore, it is important to know how this 13" ratio depends on volume (or pressure), temperature, and composition. Experimental data on the 14"...

Oceanic basalts, such as mid-ocean ridge basalts (MORB) and ocean island basalts (OIB), are characterized by large isotopic and trace element variability that is hard to reconcile with partial melting of a peridotitic mantle alone. Their variability has been attributed to the presence of heterogeneities within the mantle, such as recycled crust, metasomatized material or outer core contribution...

This work presents the hydrogen production from steam gasification of palm kernel shell (PKS) at 700 C in the presence of 5% Ni/BEA and 5% Fe/BEA as catalysts. The steam gasification was performed in two-staged reactors to evaluate the effect of calcinations temperature and the steam to biomass ratio on the product gas composition. The catalytic activity of Ni/BEA catalyst decreases with increa...