Molecular diffusion processes are caused by concentration gradients in a multi-component mixture. Noticeable diffusion flux can also be induced by temperature gradients which lead to partial separation of constituent components. This cross effect between temperature and concentration is known as thermo diffusion or Soret effect. This effect can be quite important in the analysis of the distribu...

Crapper waves are a family of exact periodic traveling wave solutions of the freesurface irrotational incompressible Euler equations; these are pure capillary waves, meaning that surface tension is accounted for but gravity is neglected. For certain parameter values, Crapper waves are known to have multi-valued height. Using the implicit function theorem, we prove that any of the Crapper waves ...

this study aimed to explore concentration of a low grade sulfide-oxide lead-zinc sample containing 2.3% pb, 1.91% zn taken from changarzeh mine, south natanz, iran. the effects of different parameters such as type and dosage of collector, milling retention time, dosage of sodium sulfur and its preparation time, application of sodium silicate, ph and solid content were investigated in relation t...

To be a formation mechanism of such large-scale structures as giant molecular clouds (GMCs) and HI superclouds, the classical Parker instability driven by external gravity has to overcome three major obstacles: The convective motion accompanying the instability generates thin sheets than large condensations. The degree of density enhancement achieved by the instability is too low to make dense ...

Increasing the efficiency of crushing circuits is associated with a decrease in particle size finely crushed ore and use dry magnetic separation ore. Reducing grinding costs achieved by using drum mills jointly other designs. The automation systems, slurry demagnetization, technologies staged concentrate separation, beneficiation fine screening closed cycle lead to reduction costs. main industr...

nader and simin—a separation is the first iranian movie which won manyinternational awards as well as admiration from critics and the public. many reviewsby critics, however, have revolved around problems in spousal relationships ofcouples in different social classes of iran. through highlighting the self-evidentdismantling elements and unreliable readings in the acting, directing, and even the...

The isotropic-to-nematic transition in an athermal solution of long rigid rods subject to a gravitational (or centrifugal) field is theoretically considered in the Onsager approximation. The new feature emerging in the presence of gravity is a concentration gradient that coupled with the nematic ordering. For rodlike molecules this effect becomes noticeable at centrifugal acceleration g approxi...