June 2013

Linearization of Zoeppritz equations and practical utilization

The theory and practical utilization of simplification of the original general expressions for the reflection of compression and shear waves at a boundary as a function of the densities and velocities of layers in contact are presented in this paper. The original general expressions are highly non-linear and presumed to defy physical insight. Elimination of the properties of Vs and ΔVs in favour of ...

Author(s): Oladapo, Michael Ilesanmi

June 2013

Potential reduction of concrete deterioration through controlled DEF in hydrated concrete

Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete structure. In this study,...

Author(s): Samo Lubej and Milan Radosavljevic

June 2013

Dissolved and particulate trace elements’ configuration: Case study from a shallow lake

Trace element distribution was monitored for Uluabat lake water polluted with point and non-point sources in Bursa. An examination of Zn, Cr, Ni, Cu, Pb, As, B concentrations during the study period indicated that the particulate phase at the bottom of the water column were high in regard to dissolved phase. The source of trace elements in thedeeper parts of the water column was derived from the higher...

Author(s): Feza Karaer, Aslıhan Katip, Saadet İleri, Sonay Sarmaşik and Nurcan Aydoğan