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Models of single-species and predator-prey systems in a polluted closed environment are developed and partially analyzed. Three cases are considered: a single influx of toxicant, a constant influx of toxicant, and a periodic pollution of the environment. In the case of single-species growth we are able to determine some local and global dynamics. In the case of predator-prey systems, we investigate the existence of steady states for a small constant influx of toxicant.

The effects of peripheral-layer viscosity on the flow characteristics of a bio-fluid due to peristaltic transport has been investigated. It is shown that, for a given pressure drop, the flow flux increases and the frictional force decreases as the viscosity of the peripheral-layer fluid decreases. However, for zero pressure drop, the flux does not depend upon this viscosity while the friction force decreases as it decreases.The analysis has been applied and compared with observed data.

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In this paper, the hydromagnetic theory for squeeze films of conducting lubricants has been discussed with special reference to roller and slipper type of bearings. The effect of magnetic field has been theoretically investigated and it has been shown that the load capacity, pressure, and time of approach can be increased by applying the magnetic field in the system.

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