Naser Abdo

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Removal of Cr(III) and Cr(VI) from aqueous solutions by different types of sand as a low cost abundant adsorbent was investigated. White, yellow and red sands from the United Arab Emirates (UAE) were employed at various adsorbent/metal ion ratios. The effect of contact time, pH, temperature, metal concentration and sand dosage was studied. The optimal pH(More)
In this paper, A new distribution called Exponential Lomax distribution is introduced. It is seemed that the parameter values of our new distribution are depending on decreasing and upside-down bathtub failure rate function. Also, the statistical properties of this model are studied, such as, quantiles, moments, mean deviation. Moreover, maximum likelihood(More)
Caffeine (1,3,7-trimethylxanthine) is purine alkaloid, and it is secondary metabolite produced naturally in plants. It plays a crucial role in defense and stress tolerance. A hydroponic experiment was carried out to study the morphological, biochemical, and ultrastructural effects of caffeine treatment on seedlings of tobacco (Nicotiana tabacum L. cv.(More)
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