Design of a remote, multi-range conductivity sensor

So far, research on remote conductivity detection has primarily focused on large conductivities. This paper examines the entire conductivity range, proposing a method that can be adapted to the desired application. The optimization procedure for the different regions is presented and discussed. Specific interest is given to the low-conductivity range, below 10 S/m, which covers human body tissues. This could lead to applications in body imaging, especially for induction tomography. Conductivities below 12.5 S/m are extracted experimentally with an error below 10%

Superdirectivity from arrays of strongly coupled meta-atoms

This is the final version of the article. Available from AIP Publishing via the DOI in this record.We explore the possibility of achieving superdirectivity in metamaterial-inspired endfire antenna arrays relying on the good services of magnetoinductive waves. These are short-wavelength slow waves propagating by virtue of coupling between resonant meta-atoms. Magnetoinductive waves are capable of providing a rapidly varying current distribution on the scale of the free space wavelength. Using dimers and trimers of magnetically coupled split ring resonators with only one element driven by an external source, we introduce an analytical condition for realising superdirective current distributions. Although those current distributions have been known theoretically for a good 60 years, this is the first time that a recipe is given to realise them in practice. Our key parameters are the size of the array, the resonant frequency and quality factor of the elements, and their coupling constant. We compare our analytical results for coupled magnetic dipoles with numerical results from CST simulations for meta-atoms of various shapes. The calculated bandwidth of 5 MHz for a dimer operating at 150 MHz indicates that, contrary to popular belief, superdirective antennas exist not only in theory but may have practical applications.Financial support by the John Fell Fund (University of Oxford) and by the EPSRC UK (SYMETA, EP/N010493/1) is gratefully acknowledged

Electric and Magnetic Excitation of Coherent Magnetic Plasmon Waves in a One-dimensional Meta-chain

A one-dimensional diatomic meta-chain with equal-size holes and different-length slits is designed. Broadband coherent magnetic plasmon waves (MPW) are formed in such a system, excited by both the electric resonance in the slits and the magnetic resonance in the holes in a wide range of incidence angles (00-400) and broad frequency bands (200-230 THz). The dispersion properties of the MPW measured in our experiments agree with the theoretical calculation based on the Lagrange model. The coherent MPWs reported in this paper may have applications in subwavelength integrated nanocircuits

The effect of stripe domain structure on dynamic permeability of thin ferromagnetic films with out-of-plane uniaxial anisotropy

The permeability is calculated for a thin ferromagnetic film with the stripe domain structure and out-of-plane uniaxial magnetic anisotropy. Analytical expressions for the frequency dependence of components of permeability tensor are derived with the use of the Smit-Beljers method, with the thickness of domain walls and the domain wall motion being neglected. The effect of the domain width and the angle between the anisotropy axis and the film plane on the frequency dependence of the permeability is analyzed. General equations relating the static permeability components and the ferromagnetic resonance frequencies are found. The results of the approach are applied to the derivation of the constraint for the microwave permeability of thin ferromagnetic films. The analysis of the constraint as a function of the axis deviation angle, the domain aspect ratio and the damping parameter allows the conditions to be found for maximal microwave permeability. The results obtained may be useful in connection with the problem of developing high-permeable microwave magnetic materials.Comment: 22 pages, 6 figure

SOME APPROACHES TO RESEARCH OF DEVELOPMENT OF MODERN SOCIAL AND ECONOMIC SYSTEMS

Статья посвящена анализу подходов к исследованию развития социально- экономической системы современного общества. Дан обзор методов иконологи- ческого, когнитивного и синергетического моделирования. Article is devoted to the analysis of approaches to research of development of social and economic system of a modern society. The review of methods iconological, cognitive and synergetrics modelling is given

MATHEMATICAL MODELING IN INDUSTRIAL PRODUCTION PROCESSES

The article substantiates the need to use mathematical methods for modeling industrial production processes. An example of setting and solving a modeling problem using correlation-regression analysis is given. The stages of solving and analyzing the production problem are considered.В статье обосновывается необходимость применения математических методов для моделирования процессов промышленного производства. Приводится пример постановки и решения задачи моделирования с использованием корреляционно-регрессионного анализа. Рассматриваются этапы решения и анализа производственной задачи

Analysis and forecasting of performance indicators of air transport facilities

Aviation is one of the most significant growth drivers not only for the transportation infrastructure, but also for country’s economy as it contributes to both industrial and social progress of society. The paper focuses on Sheremetyevo International Airport, one of the largest Russian airports and analyzes it in terms of short-term and long-term perspectives. Using real statistical data, the article presents the models for forecasting essential performance indicators of airports, namely, passenger traffic and revenue. By comparing quality characteristics, most suitable models were selected and checked for adequacy. Forecasts of the probable changes in the values of the performance indicators were made under the assumption of maintaining the previously formed development trend

WHY DOES NOT DEVELOP THE RUSSIAN REGIONS?

Sustainable development of the state is provided by means of balanced socio-economic development of all its regions. The most important condition for regional economic development is complete and the high activity of regional business structures, which is determined by their financial capabilities. The article presents a comparative analysis of the financial performance of enterprises and organizations in the two selected areals: the metropolitan and regional. On the basis of the real, unadjusted statistical data traced difference of capabilities and dynamics of changes health of areal’s business. Using the methods of statistical and regression analysis allowed to justify conclusions about the excessive differentiation of the business opportunities of the capital and the regions and build a forecast of further degradation of regional economies, while maintaining the current trend. Formulated conclusions and recommendations for return to the area of ratios which allowing to maintain the trend of sustainable development

Eurasian Macro-Region: Choosing a Sustainable Way of Development

The article substantiates the need to choose a new paradigm for the macro-regional development of Eurasia, which, along with other macro-regions, has found itself in recent decades in a situation where the old theoretical platform for regional development has ceased to correspond to modern conditions of economic and socio-political reality. The system paradigm proposed as an alternative puts forward the principle of studying the region as a holistic system based on the analysis of interconnections and relations between its individual components. This applies both to the internal relations of the system (economic, cultural, organizational, demographic, social and others), as well as interconnections with the environment external to the system. According to the authors, the growing role of economic sustainability is determined by the objective need to develop theoretical, methodological, and practical guidelines that would enable the process of transition to a sustainable development format