On stability of collisional coupling between relativistic electrons and ions in hot plasmas

The collisional coupling of relativistic electrons and non-relativistic ions in hot plasmas has been analysed. It is found that relativistic effects produce a new feature: while the condition T_e<3T_i guarantees a stable collisional coupling between electrons and ions in low-temperature plasmas, relativistic effects shift the upper T_e/T_i boundary of stability to higher values. Moreover, for sufficiently high temperatures, T_{e,i} > 75 keV, collisional decoupling between relativistic electrons and ions becomes impossible

Relativistic neoclassical radial fluxes in the 1/nu regime

The radial neoclassical fluxes of electrons in the 1/nu regime are calculated with relativistic effects taken into account and compared with those in the non-relativistic approach. The treatment is based on the relativistic drift-kinetic equation with the thermodynamic equilibrium given by the relativistic Maxwell-J\"uttner distribution function. It is found that for the range of fusion temperatures, T_e<100 keV, the relativistic effects produce a reduction of the radial fluxes which does not exceed 10%. This rather small effect is a consequence of the non-monotonic temperature dependence of the relativistic correction caused by two counteracting factors: a reduction of the contribution from the bulk and a significant broadening with the temperature growth of the energy range of electrons contributing to transport. The relativistic formulation for the radial fluxes given in this paper is expressed in terms of a set of relativistic thermodynamic forces which is not identical to the canonical set since it contains an additional relativistic correction term dependent on the temperature. At the same time, this formulation allows application of the non-relativistic solvers currently used for calculation of mono-energetic transport coefficients.Comment: 10 pages, 2 figure

Renormalized theory of the ion cyclotron turbulence in magnetic field--aligned plasma shear flow

The analytical treatment of nonlinear evolution of the shear-flow-modified current driven ion cyclotron instability and shear-flow-driven ion cyclotron kinetic instabilities of magnetic field--aligned plasma shear flow is presented. Analysis is performed on the base of the nonlinear dispersion equation, which accounts for a new combined effect of plasma turbulence and shear flow. It consists in turbulent scattering of ions across the shear flow with their convection by shear flow and results in enhanced nonlinear broadening of ion cyclotron resonances. This effect is found to lead to the saturation of ion cyclotron instabilities as well as to the development of nonlinear shear flow driven ion cyclotron instability. 52.35.RaComment: 21 page

ENERGETIC CHARACTERISTICS OF THE SURFACE ELECTROMAGNETIC WAVE AT PLASMA-PLASMA INTERFACE IN MAGNETIC FIELD

Energetic characteristics of a surface wave at a plane plasma-plasma interface in an external magnetic field are studied. The dependencies of energy flow density and energy density on wave vector for different magnitudes of external magnetic field are analyzed. The sign of the Poynting vector in each plasma region is investigated. It is shown that the total energy flux of the surface wave is directed along the wave vector. The velocity of energy propagation is found. The equivalence between energy velocity and group velocity of the wave is demonstrated. The results obtained in the paper may be useful for analysis of transmission of electromagnetic waves through two-layer plasma structures in a magnetic field

SILICON MONOCRYSTALS FOR ALTERNATIVE ENERGY

This paper considers features of the formation and microstructure revealing of profound n- and p-type silicon monocrystals. Influence of hole and electron conductivity in semiconductors on the pattern of anodic etching is determined. Correlation among silicon microstructure, dislocation density and minority carriers’ lifetime has been studied. Influence of impurity diffusion from the surface into the space of the crystal on electrical properties’ changes of the semiconductor is shown

ESPEG model and corporate governance system for ensuring sustainable development of enterprises

In 2023, there is a pressing requirement to promote enterprise growth and guarantee enduring sustainability, therefore, it is timely to craft an effective model for sustainable progress and establish a corporate governance framework. The aim of the research was to develop innovative approaches to ensure the sustainable development of enterprises through the development of a sustainable development model and corporate governance system. The essence of the concepts of “corporate governance” and “corporate management” is also defined in the article using the categorical method of two-level triadic decoding. The research is based on the principles of sustainable development, systemic and holistic approaches. The article proposes a four-component model of the enterprise sustainable development concept (ESPEG model), which reflects the hierarchical arrangement of the environmental (E), socio-political (SP), economic (E), and governance (G) spheres of the enterprise. This model identifies the directions for the application of management tools to influence specific interacting spheres. The result of the work is an improved model of enterprise sustainable development that enables the structuring of the key components of the concept to ensure effective management of the enterprise based on the balance of its key elements. The model of corporate governance system has been improved, incorporating the paradigm of sustainable development and considering the necessity of integrating various management subsystems within the company. The proposed corporate governance system identifies the control loop of corporate management and defines the governing and controlled subsystems along with their components. It has been established that a corporate governance system built on the principles of sustainable development will contribute to achieving positive results in the company’s development, ensuring the sustainability of its social, environmental, and economic aspects. The implementation of the proposed corporate governance system will facilitate further research into its essence and application specifics in modern companie

Potential surface waves in a warm nonisothermal plasma bounded by metal

The dispersion properties of potential surface waves (SW), propagating at a warm nonisothermal plasma‐metal boundary across the external magnetic field are studied in this paper. The existence of potential SW is shown to be possible in frequency ranges, where electromagnetic SW do not exist. The influence of transverse plasma density inhomogeneity on dispersion properties of the SW considered is studied as well.</p