The paper deals with the processes of particle and energy transport by localized large-scale drift vortices in the ocean and atmosphere. In the case of nondivergent (in the first order approximation) fluid motions the evolution equation of the rotor of a generalized momentum can be reduced to the Charney-Hasegawa-Mima equation. The same equations are used to describe plasma motions. Vortex solutions of the Charney-Hasegawa-Mima equations are shown to participate in transport processes.

A study is made of the non‐stationary contraction of an electron‐hole plasma by the magnetic field which is generated by the current flowing through the crystal. Two geometries of the crystal (cylinder and plate shape) have been examined. The influence of bulk recombination on the process of pinching as well as on the condition of collapse has been analysed. The results are illustrated by numerical examples.

Theoretical and experimental investigation of the pinch-effect–a compression of the electron-hole plasma by the selfmagnetic field of a current–has been performed for crystals of indium antimonide in which the plasma was produced by impact ionization. The emphasis was on the effect of surface recombination on the current-voltage characteristics of the crystal. The experimental results obtained for crystals with different surface recombination velocities give unambiguous evidence of the presence of a pinch-effect. Data of new experiments are given, which confirm the destruction of a pinched state by an external longitudinal magnetic field.

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