In this study the distribution and accumulation indices of some heavy metals in sediments and Tilapia zillii fish in freshwater catchment of River Niger by Ajaokuta Steel Company (ASC), North Central Nigeria were investigated. Water, bottom sediments and Tilapia zillii fish samples were collected upstream and downstream of the drainage column by ASC, Ajaokuta. The sample were digested according...

From a nano electronic circuit designer’s point of view the growth of ultrathin film in the ultra high vacuum chamber (UHVC) would imply better stainless steel structure. ZAF method and SEM (scanning Electron Microscopy) technique are used to realize surface nano crystallizafion on an stailness steel sample. The as-welded condition of UHVC is also studied to see if this chamber can prevent weld...

For the years 1987-1990 160 individual samples of manual metal arc stainless steel (MMA/SS) welding fumes from the breathing zone of welders in four industrial plants were collected. Concentrations of soluble and insoluble chromium (Cr) III and Cr VI compounds as well as of some other welding fume elements (Fe, Mn, Ni, F) were determined. Concentration of welding fumes in the breathing zone ran...

Knudsen effusion mass spectrometry (KEMS) is a very powerful technique for studying the vaporization thermodynamics of inorganic systems at high temperatures. Although primarily one examines the vapor phase, information about condensed phases are also obtained through careful measurements and analysis of the results in accordance with the phase rule. In this paper, we have shown the capability ...

Manganese (Mn) oxides, which are generally considered biogenic in origin within natural systems, are the only oxidants of Cr(iii) under typical environmental conditions. Yet the influence of Mn biooxide mineral structural evolution on Cr(iii) oxidation under varying geochemical conditions is unknown. In this study we examined the role of light, organic carbon, pH, and the structure of biogenic ...

The microstructures, mechanical properties, and anticorrosion properties of Fe–25Mn–Cr(12, 18 wt.%)–CN TWIP steels compared with nominal Fe–22Mn–0.6C steel (TWIP-ref) in the solid-solution state were investigated present study by using X-ray diffraction (XRD), electron backscattered (EBSD), transmission microscopy (TEM), tensile tests, potentiodynamic polarization measurement, etc. results show...

Introduction: The Mn-Cr analyses of several H chondrites including Forest Vale, Dimmitt, Ste Mar-guerite and Richardton [1-3], have all shown reasonable agreement between the obtained 'Mn-Cr ages' and the known Pb-Pb ages determined on phosphates. These studies imply that the best fit lines in the 53 Mn-53 Cr evolution plots for these meteorites are isochrons rather than mixing lines and that t...