background: it has been claimed that by using different washing methods, the sperms can be separated according to size, motility, density, chromosomal content and surface markings and charge. these methods also reduce sperm chromatin deficiencies and screen the sperms before applying in assisted reproduction techniques. objective: this study compared simple density gradient methods and a combin...

operational variables of a mineral processing circuit are subjected to different variations. steady-statesimulation of processes provides an estimate of their ideal stable performance whereas their dynamicsimulation predicts the effects of the variations on the processes or their subsequent processes. in thispaper, a dynamic simulator containing some of the major equipment of mineral processing...

A size-selective cell sorting microfluidic device that utilizes optical force is developed. The device consists of a three-dimensional polydimethylsiloxane microstructure comprised of two crossed microchannels in a three-dimensional configuration. A line shaped focused laser beam is used for automatic size-selective cell sorting in a continuous flow environment. As yeast cells in an aqueous med...

   Graphene oxide nanosheet (GONS) can be a suitable membrane for gas separation with high permeability and selectivity. Separation of N2/CO2 using functionalized GONS was investigated by molecular dynamics simulations. The simulated systems were comprised of two types of GONS with a pore in their center, N2 and CO2 molecules. The selectivity and ...

The well-known sorting processes like density separation, separation in magnetic or electric fields and flotation, are not suitable to apply successfully within a particle-size range smaller than 10 m. Due to insufficient selectivity of above mentioned enrichment processes the concentrate recovery at this particle size range is extremely poor, which influences accordingly the techno-economic ef...

Using MRI and high-speed video we investigate the motion of a large intruder particle inside a vertically shaken bed of smaller particles. We find a pronounced, nonmonotonic density dependence, with both light and heavy intruders moving faster than those whose density is approximately that of the granular bed. For light intruders, we furthermore observe either rising or sinking behavior, depend...

Bhave RR (ed.) (1991) Inorganic Membranes. Synthesis, Characteristics and Applications. New York: Van Nostrand Reinhold. Cheryan M (1998) UltraTltration and MicroTltration Handbook. Lancaster, PA: Technomic. Cheryan M and Alvarez J (1995) Membranes in food processing. In: Noble RD and Stern SA (eds) Membrane Separations. Technology, Principles and Applications, p. 415. Amsterdam: Elsevier. Cher...

Despite their popularity and importance, pointerbased programs remain a major challenge for program verification. In this paper, we propose an automated verification system that is concise, precise and expressive for ensuring the safety of pointer-based programs. Our approach uses user-definable shape predicates to allow programmers to describe a wide range of data structures with their associa...

This paper proves exponential separations between depth d -LK and depth (d + 1 2 )-LK for every d ∈ 1 2 N utilizing the order induction principle. As a consequence, we obtain an exponential separation between depth d -LK and depth (d+1)-LK for d ∈ N . We investigate the relationship between the sequence-size, tree-size and height of depth d -LK-derivations for d ∈ 1 2 N , and describe transform...