[The mathematical model for immunological aging rate evaluation].

The mathematical model was created to evaluate the immunological age and immunological aging rate in men between 31 and 81. This model enables to evaluate the immunity aging rate among men of this age, diagnose the patients with the increased aging rate by determining their immunological age, and use it for the follow-up monitoring of the aging process and evaluation of the therapeutic and rehabilitation treatment efficiency for this group of people.

Permeability determination through NMR detection of acoustically induced fluid oscillation.

We present a novel approach for directly measuring the permeability of reservoir rocks by an instrument lowered in a well bore. The measurement is made by creating an oscillatory motion of fluids in the pores by acoustic stimulation and by detecting the amplitude response as a phase shift on a nuclear magnetic resonance relaxation signal. A full theoretical description is given.

Holtsmark distributions in point-vortex systems.

The statistics of uncorrelated point vortices in a plane is studied analytically and numerically. Theoretical distributions are obtained with the general method developed by Holtsmark [Ann. Phys.