Wheat is one of the most grown crops in Saudi Arabia. It is grown in various regions of the country. Accurate knowledge of the elemental concentrations in wheat and its products (bran and flour) is of great importance from a nutritional point of view. Wheat samples were obtained from the Al-Qusim region, 300 km northwest of Riyadh, and analyzed. Up to 50 elements (Al, Sb, As, Ba, Br, Cd, Ca, Cs, Cl, Cr, Co, Cu, Ga, Au, Hf, In, I, Ir, Fe, Mg, Mn, Hg, Mo, Ni, K, Rb, Sc, Se, Ag, Na, Sr, Ta, Te, Th, Sn, Ti, W, U, V, Zn, Zr, Ce, Dy, Eu, La, Lu, Nd, Sm, Tb and Yb) were determined in the wheat products. It was observed that the elemental content of bran was much higher than that of white flour.
Authors:Khaja W. Ahmed, Syed A. Ali, Shakeel Ahmed, and Muhammad A. Al-Saleh
the sulfur atom. Upon addition of Co or Ni, the HDS and HDN activities of MoS 2 /γ-Al 2 O 3 increase substantially. Density-functional theory (DFT) calculations show that the most stable position for the promoter atom (Co or Ni) is at the edge; there
Authors:M. Al Bosta, J. Al Radaideh, and A. Ismail
222Rn concentrations were measured in 50 dwellings in Celein region, west of Al Khums city in Libya. Time-integrated passive
radon dosimeters containing CR-39 detectors were used in this study. The measurements were done in living and bedrooms for
each dwelling. After 3 months detectors were collected. Then, applying chemical etching to the exposed detectors, nuclear
track numbers and corresponding indoor radon concentrations were determined. The arithmetic mean is 76.1 ± 49.4 Bq m−3 and the geometric mean is 63.8 Bq m−3 with a geometric standard deviation of 1.8. Data distribution is well fitted by a log-normal curve. The fractions of rooms
where radon concentrations exceed the reference levels of 148 Bq m−3 is 7.8%. Risk of lung cancer ranges from 4 to 32 per thousand dwellers for nonsmokers and smokers respectively.
Fast neutron activation analysis technique was applied for the determination of Si, Al, Ti, Fe and Zr in glass sand rock samples. The samples and standards were irradiated with a mono-energetic neutron flux of 108n · cm– · s–1. Pneumatic facility was used. The gamma activities from samples and standards were counted using a 30 cm3 Ge(Li) detector, with FWHM of 2.9 keV at 1.332 MeV, coupled to an on-line computer facility.
Authors:Anna Maria Cardinale, Daniele Macciò, Stefano Delfino, and Adriana Saccone
The development of light weight alloys has received great attention in recent years; in this framework Al–Si-based alloys are widely used in industries for their low thermal expansion, good resistance to wear and