July 2012

Quantum simulation study of gate-all-around (GAA) silicon nanowire transistor and double gate metal oxide semiconductor field effect transistor (DG MOSFET)

  In this paper, electrical characteristics of the double gate metal oxide semiconductor field effect transistor (DG MOSFET) and that of gate all around silicon nanowire transistor (GAA SNWT) have been investigated. We have evaluated the variations of the threshold voltage, the subthreshold slope, drain-induced barrier lowering, ON and OFF state currents when channel length decreases. Quantum mechanical...

Author(s): Reza Hosseini, Morteza Fathipour and Rahim Faez

July 2012

Heavy metal pollution around Itakpe mine, Kogi State, Nigeria

  The removal of large quantities of overburden through mining has resulted in the pollution of various ecosystems. Soil pollution around the Itakpe mine in Kogi State, Nigeria was studied through the determination of heavy metal concentration and chemical speciation of the metals cadmium (Cd), copper (Cu), magnesium (Mg), nickel (Ni), lead (Pb) and zinc (Zn) in soil using Flame...

Author(s): Kakulu Samuel and Matthews-Amune Omono Christiana

July 2012

Anti-vortex structures at hydropower dams

  Vortex formation due to power generation at hydropower dams could cause serious problems, and eliminating or reduction in its strength is one of the dam designer and manager duties. Therefore, the design and use of anti-vortex structures is usual. Design of an anti-vortex structure for each project is unique and it is therefore necessary to have knowledge about the performance of each one. In the present...

Author(s): S. M. Taghvaei, R. Roshan, Kh. Safavi and H. Sarkardeh

July 2012

Assesment of heavy metals contamination in groundwater: A case study of central industrial district in Ilorin, Kwara State, Nigeria

  Heavy metals were investigated in groundwater in the central industrial district of Ilorin, Kwara State, Nigeria. Water and sediment samples from 8 wells in the district and 2 away from the district (control) were analysed to assess the suitability of the water for human consumption and domestication purposes. The measured heavy metals concentrations exceeded the World Heaith Organization (WHO) standard...

Author(s): HUSSEIN K. OKORO, ADENIYI ADEYINKA,  OMOLLO E. JONDIKO, BHEKUMUSA J. XIMBA and SUMBU J KAKALANGA