Aquaculture plays an important role in providing protein-rich foods, meeting the growing demand for fish.However, aquaculture is a potentially polluting activity, especially with regard activecare spitfire to water pollution, due to the improper disposal of wastewater from the production process.Aquaculture wastewater is rich in nutrients (ammonia,
In this paper, we consider the mechanical effect of the sulfate attack on concrete.The durability analysis of concrete structures in contact to external sulfate solutions requires the definition of a proper diffusion-reaction model, for the computation of the varying sulfate concentration and of the rubbermaid 8 gallon trash can consequent ettringi
The question as to whether or not tempo effects distort the measurement of period mortality is controversial in recent demographic research.Only few publications, however, illustrate the underlying phenomenon of tempo effects, namely that the period death rate may increase although the mortality of all cohorts living during the analyzed period has
This study is a gas quasi experimental field trial, which was carried on families of junior high school students in district 9 in Tehran during 1994-95.The objective of this study was to demonstrate the effect of education of students on knowledge, practice attitude of their families regarding iodized salt.In this study the school were chosen by ra