This study employs Particle Induced X-ray Emission (PIXE) analytical technique for the analysis of elemental concentrations in the roadside soils in Calabar, Nigeria, in order to ascertain the levels of heavy metals in relation to traffic density. Twenty one elements, viz., Al, Si, P, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, As, Rb, Sr, Zr, Nb and Pb with concentrations (in ppm), ranging f...

The structural and oxidation behavior of nanocomposite titanium chromium nitride (TiCrN) thin films has been investigated by using x-ray diffraction (XRD), energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM). TiCrN were deposited on Si substrates the reactive DC magnetron sputtering technique from Ti-Cr mosaic target. After that, as-deposited annealed in a...

Using the method presented in Erspamer & North (2002, Paper I hereafter), detailed abundances of 140 stars are presented. The uncertainties characteristic of this method are presented and discussed. In particular, we show that for a S/N ratio higher than 200, the method is applicable to stars with a rotational velocity as high as 200 km s. There is no correlation between abundances and V sin i,...

Different reducing agents (B, Al, Si and Ti) were individually added to two gypsum-bonded investments to prepare investments preventing surface blackening of some noble cast alloys. The effect of different additive contents on green-body and burnout compressive strength, setting and thermal expansion of the investments were evaluated. The strength and expansion of the investments were changed b...

Soft magnetic properties of Fe-Co-Ni-Al-Cr-Si thin films were studied. As-deposited Fe-Co-Ni-Al-Cr-Si nano-grained thin films showing no magnetic anisotropy were subjected to field-annealing at different temperatures to induce magnetic anisotropy. Optimized magnetic and electrical properties of Fe-Co-Ni-Al-Cr-Si films annealed at 200 ◦C are saturation magnetization 9.13 × 105 A/m, coercivity 79...

C Cr ro os ss s-l la ay ye er r o op pt ti im mi iz za at ti io on ns s f fo or r m mu ul lt ti im me ed di ia a s se er rv vi ic ce es s o ov ve er r m mo ob bi il le e n ne et tw wo or rk ks s I IN NT TH HF FT T 2 C Cr ro os ss s-l la ay ye er r o op pt ti im mi iz za at ti io on ns s f fo or r m mu ul lt ti im me ed di ia a s se er rv vi ic ce es s o ov ve er r m mo ob bi il le e n ne et tw ...

Nanostructured ceramic coatings are being intensively investigated because they open a wide field of new materials with improved mechanical and tribological properties. The final behaviour of such coatings depends on their composition and microstructure. Si addition in nitride compounds has shown to improve significantly their hardness. For instance, in the TiSi-N coating system, coating hardne...