نتایج جستجو برای: drop filter
تعداد نتایج: 168254 فیلتر نتایج به سال:
Background and Aim: Bioaerosols are one of the most important agents that cause post operating infections in hospitals. Surgical masks are recommended for prevention of bioaerosols transmition in operating rooms. This study aimed at evaluation of submicron particle filtration efficiency of domestic and imported surgical masks. Materials and Methods: In this cross sectional study, 5 types of...
Usually a light beam pushes a particle when the photons act upon it. We investigate the optical forces by non-paraxial gradientless beams and find that the forces can drag suitable particles all the way towards the light source. The major criterion of realizing the backward dragging force is the strong non-paraxiality of the light beam, which contributes to the pulling force owing to the moment...
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