June 2009
Correlation between electrical resistivity and soil-water content: Istanbul and Golcuk
Soil is a heterogeneous medium which consist of liquid, solid, and gaseous phases. The solid and liquid phases play an essential role in soil spontaneous electrical phenomena and in behavior of electrical fields, artificially created in soil. Soil air can be considered as a dielectric. Soil electrical properties are the parameters of natural and artificially created electrical fields in soils and influenced by...
June 2009
Air pollution tolerance indices (APTI) of some plants around Erhoike-Kokori oil exploration site of Delta State, Nigeria
The study examined air pollution tolerance indices (APTI) of ten plant species around the Erhoike-Kokori oil exploration station of Delta state. Four physiological and biochemical parameters; leaf relative water content (RWC) ascorbic acid content (AA), total leaf chlorophyll (TCh) and leaf extract pH were used to compute the APTI values. The result showed that combining variety of these parameters gave a more reliable...
June 2009
Derivation of statistical models to predict roughness parameters during machining process of PEEK composites using PCD and K10 tools
In many scientific fields, non-linear regression based models are of great utility to perform curve adjustment of experimental data. This concept is used in the present study in order to construct adequate adjusted models enabling to make predictions for the different roughness parameters characterizing machining of PEEK composites when using PCD and K10 tools. The adjusted data were obtained by using design of...
June 2009
Solar assisted photo-catalytic degradation of amido black 10B over cobalt, nickel and zinc metalloporphyrins
The tetraphenyl porphyrins (TPP) and metalloporphyrins such as CoTPP, NiTPP and ZnTPP were synthesized, purified and characterized by UV-Visible spectroscopy, IR spectroscopy, 1H NMR spectroscopy and elemental analysis. The results have been discussed in the light of magnetic susceptibility; diffuse reflectance spectroscopy (DRS), electron spin resonance (ESR), X-ray diffraction data and solar assisted...
June 2009
The analytical and numerical investigation of thermo-optic effects in double-end-pumped solid state lasers
In this paper, thermal effects in double-end pumped Nd:YVO4 laser crystal have been investigated. The analytical expression for temperature distribution and thermo-optic effects such as temperature-dependent change of refractive index (dn/dT effect) and end effect have been calculated and the results then applied to Nd:YVO4 crystal., Our analytical model compared with exact numerical calculations and good...
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