First Results of Ion Trapping in the Dresden EBIT II

Hyperfine Interactions - It is well known that many reinforced concrete structures are at risk of deterioration due to chloride ion contamination of the concrete or atmospheric carbon dioxide...     

Symmetry of the Barochronous Motions of a Gas

We study the system of nonlinear differential equations which expresses the constancy of the algebraic invariants of the Jacobian matrix for smooth vector fields in three-dimensional space. This system is equivalent to the equations of gas dynamics which describe the barochronous motions of a gas (the pressure and density depend only on the time). We present the results of computation of the admissible local Lie group and construction of the general solution of the system. We mention a few new problems that arise here.     

New method for determination of heats of thermal gas-phase reactions yielding intermediates

A new procedure for the determination of the heats of thermal gas-phase reversible reactions leading to intermediates in the framework of the adiabatic compression method is proposed. A model problem is solved, and the error of the method is evaluated (-1 %). The validity of the method was confirmed using the reversible formation of the I,2-biradical from tetrafluoroethylene as an example. Translated from Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 64–67, January, 1996.     

Comparison of additional second-order terms in finite-difference Euler equations and regularized fluid dynamics equations

In recent years, an area of research in computational mathematics has emerged that is associated with the numerical solution of fluid flow problems based on regularized fluid dynamics equations involving additional terms with velocity, pressure, and body force. The inclusion of these functions in the additional terms has been physically substantiated only for pressure and body force. In this paper, the continuity equation obtained geometrically by Euler is shown to involve second-order terms in time that contain Jacobians of the velocity field and are consistent with some of the additional terms in the regularized fluid dynamics equations. The same Jacobians are contained in the inhomogeneous right-hand side of the wave equation and generate waves of pressure, density, and sound. Physical interpretations of the additional terms used in the regularized fluid dynamics equations are given.     

Measuring the Electric Field Strength of Microwave Radiation at the Frequency of the Radiation Transition Between Rydberg States of Atoms 85Rb

Optics and Spectroscopy - The spectral characteristics of the resonance effect of the electromagnetic-induced transparency (EIT) of rubidium atomic vapors induced by intense radiation with a...     

EFATOM two-detector one-photon emission gamma tomograph

The EFATOM two-detector one-photon emission computer tomograph, which is intended for radionuclide diagnostics of the internal organs and systems in the human body, has been designed and tested. A schematic diagram of its software package and detection units is represented. The results of its technical tests are presented. The characteristics of the EFATOM gamma tomograph are compared with its foreign analogs.     

Thermoelectric study of the phase transitions in cerium at ultrahigh pressures from 0 to 20 GPa

The pressure dependences of the thermoelectric power S of Ce samples were measured at pressures P from 0 to 20 GPa in a synthetic diamond cell. The dependence of S on P was found to be nonmonotonic both in the region of transitions from the fcc (γ) phase to the modified fcc (α) phase followed by the transition to the body-centered monoclinic (α″) and the tetragonal (ε) phases at pressures of about 1, 5–6, and 12–15 GPa, respectively, and in the stability region of these phases. The thermoelectric power sign was found to be positive for all high-pressure Ce phases. The found S(P) dependence was compared with the published computational data on the electronic structure of the cerium phases. Cerium was taken as an example to demonstrate the advantage of the thermoelectric studies over other methods of investigation of phase transitions.