the membrane separation technology by relying on microfiltration ultrafiltration, and reverse osmosis methods are becoming more important among consulting engineers, designers of environmental pollution control system, and industrial factories. the advantages of this technology together with its emphasis on recycling the fluid to the system and reusing the membranes have caused the membranes to...

We propose and analyze a heterogeneous, multigroup, susceptible-infectivesusceptible (SIS) sexually transmitted disease (STD) model where the desirability and acceptability in partnership formations are functions of the infected individuals. We derive explicit formulas for the epidemic thresholds, prove the existence and uniqueness of the equilibrium states for the two-group model and provide a...

transfusion of blood products from an infected person with aids, is meant to infect recipient. blood products such as whole blood, red blood cells, platelets, plasma, frozen blood precipitate, factor viii, factor ix, can be infected with hiv. transmissions from blood factors can be seen in plasma from thousands of donors that were collected in a container and were used to treat hemophilia. bloo...

In this study, the problem of navigation in dynamic and unknown environment is investigated and a navigation method based on force field approach is suggested. It is assumed that the robot performs navigation in...

A number p is a safe prime if both p and (p − 1)/2 are prime. This note describes a method of generating safe primes that is considerably faster than repeatedly generating random primes q until p = 2q + 1 is also prime.