background: contemporary development of growing urban communities and increasing the economical and industrial activities in the current century without paying attention to assess the effect of these activities on human health, as the axis of the development, is caused urban air pollution and risks from different pollutant emissions. tehran air pollution has received considerable media coverage...

air spindles are one of the main elements of precise machine tools. vibration of these spindles is one of the vital issues necessary for investigation. among parameters which influence air spindle vibrations are rotational speed, compression air method, input nozzle diameter, air gap pressure. in this study using ansys, the effects of air gap thickness on air spindle vibrations have been invest...

Metastasis of breast cancer is a multistep process that requires cancer cells to invade stroma at the primary site, gain access to vasculature, survive in the circulation, extravasate into the parenchyma of the secondary site, and survive and proliferate at the secondary site. During each of these steps, the microenvironment surrounding the cancer cells is believed to be an active participant. ...