IOSR-JAP   Volume-7 ~ Issue-4 ~ July-August 2015

ABSTRACT: This paper compares the prediction of three empirical models for estimating the global radiation at Jos with values obtained by measurement using 5years data collected from the Nigerian Meteorological Agency (NIMET). Two of these models, Angstrom's and Reitveld's, related the global radiation to the sunshine duration. The third model, due to Monteith, related the global radiation to the maximum irradiance at solar noon. Mean daily values of insolation, H , were computed and averaged over the 5-year period. Mean bias errors (MBE), root-mean-square errors (RMSE) and correlation coefficients (R) were also computed.

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ABSTRACT: The Bromine derivative of phenyl hydrazine has been studied for its insecticidal properties1. It has also found numerous applications in analytical chemistry2-4, chemotherapy5-8 and as chromogenic reagents9. It has been synthesised byDr A Sahay and his co-workers as part of their project to study the crystal structure of a series of phenylhydrazones and their stereochemistry the crystal structure of the title compound has been determined 10-13. Earlier I reported the structure of ―2-[(p-Bromophenyl) hydrazono]-3-ethoxy-3-oxo-propanoic acid‖ (SINHA K et al., 2012).

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ABSTRACT: A precise method for determination of penetration depth of β-radiationin paraffin wax and mica is described in this paper.The measurements have carried out using Gamma-Scout with Tl-204 and Cs -137 sources. The Gamma Scout is very sensitive, portable and reliable instrument. We have used paraffin wax of density 0.9 g/cm3 and mica of density 2.8g/cm3.The penetration depth of β-particles strongly depends on energy of incident β-radiation and the density of the intervening material. The paraffin wax is low density material its density is nearly equal to density of flesh and hence determination of penetration depth of β-radiation in the paraffin wax is helpful in understanding the interaction of β-particles with low density materials.

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