نتایج جستجو برای: contact cr
تعداد نتایج: 206902 فیلتر نتایج به سال:
Background and purpose:As the usage of chromium in chemical industries, electroplating, leather tanning and paint processes will increase, so the chromium pollution in water has become a considerable problem. Hexavalent chromium (Cr (VI)) has been reported toxic to aquatic organisms, animals and humans. It has been known to be carcinogenic. Thus, it should be removed from wastewater before disc...
We establish a new lower bound on the first nonzero eigenvalue λ1(θ) of the sublaplacian ∆b on a compact strictly pseudoconvex CR manifold M carrying a contact form θ whose Tanaka-Webster connection has pseudohermitian Ricci curvature bounded from below.
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