The present paper has three folds: first, to provide some basic descriptive statistical parameters for the apparent and absolute magnitudes of the nearby stars of spectral type GOV stars Second, to establish the frequency ...

Petrographic, mineralogical and chemical analyses of marl were investigated to verify the formation processes of many alteration products under low temperature -pressure conditions, where an ample source of sulphate exists. ...

A new theoretical approach of black flat platesolar collector considering the glass cover as a participating media and taking into account the absorption and emission within a glass cover is presented. Two kinds of glasses ...

Several definitions of sustainable development have been put forth, including the following common one: development that meets the needs of the present without compromising the ability of future generations to meet their ...