Fermi-liquid and Fermi surface geometry effects in propagation of low frequency electromagnetic waves through thin metal films

In the present work we theoretically analyze the contribution from a transverse Fermi-liquid collective mode to the transmission of electromagnetic waves through a thin film of a clean metal in the presence of a strong external magnetic field. We show that at the appropriate Fermi surface geometry the transverse Fermi-liquid wave may appear in conduction electrons liquid at frequencies $\omega$ significantly smaller than the cyclotron frequency of charge carriers $\Omega$ provided that the mean collision frequency $\tau^{-1}$ is smaller than $\omega.$ Also, we show that in realistic metals size oscillations in the transmission coefficient associated with the Firmi-liquid mode may be observable in experiments. Under certain conditions these oscillations may predominate over the remaining size effects in the transmission coefficient.Comment: 9 pages, 5 figures, text adde

Modeling rhythmic patterns in the hippocampus

We investigate different dynamical regimes of neuronal network in the CA3 area of the hippocampus. The proposed neuronal circuit includes two fast- and two slowly-spiking cells which are interconnected by means of dynamical synapses. On the individual level, each neuron is modeled by FitzHugh-Nagumo equations. Three basic rhythmic patterns are observed: gamma-rhythm in which the fast neurons are uniformly spiking, theta-rhythm in which the individual spikes are separated by quiet epochs, and theta/gamma rhythm with repeated patches of spikes. We analyze the influence of asymmetry of synaptic strengths on the synchronization in the network and demonstrate that strong asymmetry reduces the variety of available dynamical states. The model network exhibits multistability; this results in occurrence of hysteresis in dependence on the conductances of individual connections. We show that switching between different rhythmic patterns in the network depends on the degree of synchronization between the slow cells.Comment: 10 pages, 9 figure

Numerical treatment of free surface problems in ferrohydrodynamics

The numerical treatment of free surface problems in ferrohydrodynamics is considered. Starting from the general model, special attention is paid to field-surface and flow-surface interactions. Since in some situations these feedback interactions can be partly or even fully neglected, simpler models can be derived. The application of such models to the numerical simulation of dissipative systems, rotary shaft seals, equilibrium shapes of ferrofluid drops, and pattern formulation in the normal-field instability of ferrofluid layers is given. Our numerical strategy is able to recover solitary surface patterns which were discovered recently in experiment

New Approach to Nonlinear Dynamics of Fullerenes and Fullerites

New type of nonlinear (anharmonic) excitations -- bushes of vibrational modes -- in physical systems with point or space symmetry are discussed. All infrared active and Raman active bushes for C60 fulerene are found by means of special group-theoretical methods.Comment: LaTeX, 8 pages, to be published in Fizika Tverdogo Tela, 200

THEORETICAL APPROACHES TO THE STUDY OF FUNCTIONS, STRUCTURE AND ELEMENTS OF THE SYSTEM OF PROFESSIONAL CULTURE OF CIVIL SERVANTS

The object of the research is the functions, structure and elements of civil servants’ professional culture system. It is undergoing transformation, following the changes that public administration undergoes under the influence of a service/client-centric development trend that meets current societal transformations and the possibilities of the technological revolution. The goal of the study is to systematize the range of mechanisms for developing a modern professional culture of civil service, primarily from the standpoint of client-centricity. The objectives are to identify the clientcentered governance values, highlighting the main characteristics of the modern professional civil service culture, which can be treated as the fundamental basis for its development; analyze modern tools for the formation and development of key values of civil servants, including, first of all, the values of the client-centered state. The research method is the review of scientific and professional sources from the standpoint of their reflecting the conceptual and instrumental aspects of the formation of the professional civil service culture. As a result, numerous characteristics of the modern professional civil service culture are identified, which can be attributed to the fundamental basis for the development of a client-centered culture and are based on the generalization of foreign and Russian experience. An ecosystem approach to the formation and development of components of a client-centered professional civil service culture is proposed. The novelty of this research work is determined by the lack of Russian or foreign scientific studies of tools that would be directly focused on the development of a client-centered professional culture, as well as the technologies through which these tools are to be used. Theprospects are related to the relevance of the introduction of client-centricity in the Russian government agencies, in accordance with the testing of respective tools, which began in 2022. They are also related to the need to update the scientific agenda of the professional culture formation with the issue of the productivity of introducing the values of client-centricity into the activities of government authorities

PROFESSIONAL DEVELOPMENT OF CIVIL SERVANTS IN THE CONTEXT OF THE DIGITAL TRANSFORMATION

Digital transformation in governance is possible subject to a change in the corporate culture of the federal authorities. Training and a modern system of professional development of public authorities based on digital solutions and requiring digital skills are becoming the most important tool for changing culture. At the same time, the digitalization of the processes of organizing the professional development of civil servants is impossible without improving this system, including building interconnection with the development strategy of the state body (sphere, department), the system for assessing and motivating civil servants, and their career development. The approaches to planning the professional development of civil servants, quality assessment and examination of educational programs require updating. These processes must be based on modern digital solutions and services. The object of the research is the activities of state bodies and subdivisions regulating the sphere of professional development of civil servants. The purpose of the study is to develop proposals for improving the system of professional development of public authorities in the context of the government digital transformation. The tasks are related to the analysis of the current state of the professional development system in public authorities, the development of proposals for improving the system of professional development in governance in the context of digitalization and client (citizen) centricity. The novelty of the research is determined by the introduction of new state data of the professional development system of civil servants and the proposed model of the system maturity levels under study. The research is based on a systemic approach and a comparative method. The following empirical methods are used: sociological research (in-depth interviews, polls of civil servants); analysis of documents, expert sessions; modeling. The result of the research was the development of proposals for improving the system of professional development in the aspect of creating unified methodological approaches to the professional development of civil servants. The main conclusions relate to the application of the maturity level model of this system and the possibility of its use to update the existing approaches and methodological tools. A special place is occupied by proposals for the improvement of the Unified Information System for Personnel Management of the State Civil Service of Russia (EISU KS) and the Unified Specialized Information Resource (EIR) services for professional development of civil servants. The results of research can be used in the interests of federal authorities and regional governments, the Office of the President of the Russian Federation for Civil 7 Service and Personnel, the Human Resources Department of the Government of the Russian Federation, the Ministry of Labor and Social Protection of the Russian Federation to improve work on the professional development of civil servants. The prospects of the study are associated with the implementation of the proposed model of maturity levels and the development of methodological tools for moving to higher levels in terms of organizing professional developmen

Conformation of gem-diphenyl group in six-membered cyclic ethers of acids of sulfur, selenium, and arsenic

1. The sulfate, selenite, chloroarsenite, and bromoarsenite of 2,2-diphenyl-1,3-propanediol have been synthesized. 2. In the molecules of cyclic esters based on 2,2-diphenyl-l,3-propanediol, in the dissolved state, equivalent rotation of the phenyl groups relative to the ring symmetry plane is realized. © 1980 Plenum Publishing Corporation

Time-Fractional Optimal Control of Initial Value Problems on Time Scales

We investigate Optimal Control Problems (OCP) for fractional systems involving fractional-time derivatives on time scales. The fractional-time derivatives and integrals are considered, on time scales, in the Riemann--Liouville sense. By using the Banach fixed point theorem, sufficient conditions for existence and uniqueness of solution to initial value problems described by fractional order differential equations on time scales are known. Here we consider a fractional OCP with a performance index given as a delta-integral function of both state and control variables, with time evolving on an arbitrarily given time scale. Interpreting the Euler--Lagrange first order optimality condition with an adjoint problem, defined by means of right Riemann--Liouville fractional delta derivatives, we obtain an optimality system for the considered fractional OCP. For that, we first prove new fractional integration by parts formulas on time scales.Comment: This is a preprint of a paper accepted for publication as a book chapter with Springer International Publishing AG. Submitted 23/Jan/2019; revised 27-March-2019; accepted 12-April-2019. arXiv admin note: substantial text overlap with arXiv:1508.0075