to calculation non-bonded interaction of the [cocl6]3- complex embedded in nano ring, we focus on the single wall boron-nitride b18n18 nano ring. thus, the geometry of b18n18 nano ring has been optimized by b3lyp method with epr-ii (electron paramagnetic resonance) basis set and geometry of the [cocl6]3- complex has been optimized at b3lyp method with aldrich’s vtz basis set and stuttgart rsc 1...

The topological evolution of the cleavage surface of a gypsum single crystal during its dissolution in a flowing undersaturated aqueous solution has been observed with an atomic force microscope. The matter transfer from solid to liquid proceeds through the migration of atomic steps. The step velocity has been measured and appears to depend on the force applied by the tip on the surface. Wherea...

A paper disc flameless atomic absorption spectroscopy (AAS) method is described for the determination of cadmium (Cd) in blood, enabling difficulties in sample preparation to be minimized. By control of the ashing step the matrix can be removed without loss of cadmium. Problems with the fast signal response during atomization can be met by spectral band width and temperature control. At the 106...

a new approach for a cloud point extraction-electrothermal atomic absorption spectrometric method was used for determining bismuth. the aqueous analyte was acidified with sulfuric acid (ph 3.0–3.5). triton x-114 was added as a surfactant and 2-amino-cyclopentene-1-dithiocarboxylic acid was used as a complexing agent. after phase separation at 50 ◦ c based on the cloud point separation of the mi...

in this paper we examine the absorption and dispersion properties of a weak probe field via electromagnetically induced transparency (eit) in a four-level system. it is shown that under certain condition, using this model, the absorption cancellation is appeared and the medium becomes transparent to the weak probe field. it will be shown that the controlling of absorption and dispersion spectru...

giardia, a protozoan parasite, resides in the small intestine in man. this parasite damages the mucosal intestinal surface and in severe cases produces malabsorption and it may also affect mineral absorption, especially zinc. in this study a total of 118 infested and 43 non-infested persons as a control group were selected. from each patient a 5 ml blood sample was obtained. the serum was separ...

Correlation between results of a Conventional macroscale (5 ml of blood) atomic absorption procedure for lead determination and results of the Delves micro-scale (10 tl blood) atomic absorption method was high (0.96). Analyses of lead in capillary and intravenous blood samples also correlated well (0.93). The coefficient of variation of the Delves micro-scale method was 8% for a concentration o...