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In this work, the crystal structure of Leptothrix biosamples was studied using positron annihilation lifetime spectroscopy, MIKA modeling package and X-ray diffraction method. The structural analysis results showed that free cubic and orthorhombic phase Fe and trigonal Fe2O3 and cubic Fe3O4 phases were detected in Leptothrix biosamples. It has been determined that the concentration of cubic Fe3O4 phases in biosamples is higher than other phases. The theoretical bases of the regularity of distribution of hydrogen and oxygen atoms in the form of free and vacancies in the trigonal Fe2O3 and cubic Fe3O4 phases were calculated. On the other hand, the lifetime of vacancies in Fe, Fe2O3 and Fe3O4 structures has been determined. [ABSTRACT FROM AUTHOR]

The paper defines the spatial distribution of parameters of the stationary centrosymmetrical low-pressure glow discharge. To solve this problem, we use the system of nonlinear differential equations comprising charged-particle flow equations taking account drift and diffuse components, Poisson equations on intensity of the electrical field. We propose and implement in software the iteration algorithm for solving the self-consistent system of differential equations that insure reducing the problem to solving the first-order Cauchy problem, which allow minimizing the influence of "network diffusion". Furthermore, we determine spatial distribution of the intensity of electrical field and the density of charged particles. We study the influence of pressure and of the value of electron temperature as well as of the length of the discharge gap and diffusion processes on the glow discharge characteristics and the dependence of spatial distributions from diffuse processes. The obtained results are consitent with main principles of the classical theory of glow discharge. [ABSTRACT FROM AUTHOR]

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