Abstract The composite floor system, composed of steel deck and concrete slab, generates more efficient economical structures. On the other hand, design this type structure has a high complexity level due to consideration several variables. In respect, objective paper is present formulation optimization problem for system (steel concrete) considering such environmental as economic impacts. To f...

In this paper, a nonlinear dynamical model is proposed and analyzed to study the survival of biological species in a polluted environment considering the effect of environmental tax which can be used further to improve environmental quality. The environmental tax is imposed to control the emission of pollutants/toxicants only when the equilibrium concentration of pollutants go beyond its thresh...

in occupational and environmental health research, individual, group and community research participants have a unique and vested interest in the research findings. the ethical principles of autonomy, non-maleficence and beneficence are helpful in considering the ethical issues in the disclosure of research findings in occupational and environmental health research. researchers need to include ...