Экранирование радиоэлектронной аппаратуры
The contribution of electron–phonon scattering to conductivity of a quantum cylinder in a lon-gitudinal magnetic field has been studied. It has been shown that the conductivity of the nanotube undergoes Aharonov–Bohm oscillations with variations in the magnetic flux through the nanotube cross section. The formulas describing the temperature dependence of the resistance of the nanostructure both in the case of an isotropic phonon spectrum and with allowance for the effects of phonon confinement have been obtained in the analytical form.
In quiet low-latitude Earth's ionosphere, a rather developed current system that is responsible for the Sq magnetic-field variations is formed in quiet sunny days under the action of tidal streams. The density of the corresponding currents is maximal at the equatorial latitudes in the midday hours, where the so-called equatorial current jet is formed. In this work, we discuss the nature of the equatorial current jet. The original part of this paper is dedicated to the study of the value of its response to external effects. First of all, it is related to estimating the possibility of using the equatorial current jet for generating the low-frequency electromagnetic signals during periodic heating of the ionosphere by the heating-facility radiation. The equatorial current jet can also produce electrodynamic response to the natural atmospheric processes, e.g., an acoustic-gravitational wave.
This handbook presents a set of calculated analytical formulas for determining the basic electrophysical parameters of electronic equipment: electrical capacity, inductance and wave impedance. These parameters play an essential role in ensuring the signal integrity and power integrity of electronic equipment and its electromagnetic compatibility. It is especially important to have design ratios when designing transmission lines on printed circuit boards or in wiring with a given characteristic impedance. It is very important for developers and designers to obtain operational estimates of parameters in the early stages of design, which is possible using this handbook. The analytical expressions provided in it provide accuracy that is acceptable for engineering practice. Each formula in the reference book is accompanied by tables with the results of calculations in a certain range of parameter values, the corresponding graphs and comments that allow you to gain experience in the physical interpretation of the results. For the most cumbersome analytical expressions, alternative compact expressions based on various approximations are proposed. This greatly simplifies the calculation. The reference book is aimed at a wide range of specialists involved in the design of electronic equipment and printed circuit boards; it will be useful for practicing engineers who are engaged in the design of technical equipment
The article deals with the problems associated with the widespread introduction of digital and information technologies in various sectors of the economy of the Russian Federation, including in the transport and logistics sector. Digitalization and informatization of the transport complex, logistics processes that were perceived not so long ago as something far from reality, today are the basis of modern transport business processes prove their necessity and efficiency. The paper analyzes various informational technical transport systems (ITS) of transport and transport infrastructure management, and shows that the implementation process is not quite systematic on Russian roads. It is shown that the lack of common standards and technological platforms leads to the emergence of a number of problems, such as electromagnetic and information incompatibility, unacceptable threats and risks, cyber security, organizational disunity, inconsistency and chaos of ITS management. It is shown that to create and ITS transport industry, it is necessary to promote a unified set of standards, a single technological platform, use the principles of system engineering and build an IT architecture and infrastructure. Not timely adoption of integration measures may further lead to a traffic collapse, or Russia's lag in the development of intelligent transport and transport infrastructure.
A vocationally-oriented course on Physics with medico-biological direction is proposed in this book. The matters of application of physical methods for substances investigation are considered here in detail.
The book may ne helpful for students of medical and pharmaceutical institutes of higher education and colleges, chemical, biological and pharmaceutical faculties of universities, as well as for students of core classes and teachers of medico-biological specialties.
In this paper the technique of parametric and structural synthesis of systems of maintenance of thermal modes of electronic equipment, as optimality criterion uses the ratio of the price system - the quality (the degree of approximation of the temperature to the desired values). Describes the developed software which allows to obtain practical results through effective selection systems for ensuring the thermal regime at the stage of preliminary design and the detailed design of electronic equipment.
For the first time in the domestic technical literature, the basic physical laws in the field of electricity and magnetism and the issues of designing high-speed electronic equipment are considered in a single cycle, for which the problems of signal integrity, power integrity, and electromagnetic compatibility have taken the lead. The manual shows the methodological foundations of the application of fundamental physical laws - from the Coulomb law to the Maxwell equations - to substantiate technical solutions in the design of equipment, aimed at reducing the level of interference in signal circuits and a power distribution system, as well as ensuring electromagnetic compatibility. The publication should help a deeper understanding of the relationship of physical laws with engineering solutions, which will avoid gross errors in the design of equipment and find the most cost-effective technical solutions.
The manual is primarily aimed at bachelors in the relevant areas of training, but it will be useful for masters, graduate students and practicing design engineers of electronic equipment with increasing professional skill
The analysis of means of reproduction of fields of electromagnetic pulses on radio-electronic means in Russia and abroad is resulted.
Experiments indicating acceleration of charged particles as a result of separation of solid surfaces are analyzed. As a possible mechanism of such acceleration, generation of surface charge on the separated surfaces of a cleaved ionic crystal is considered. The maximum electric field generated due to the charging of the separated surfaces and the energy of electrons accelerated in such a field are estimated. It is shown that, for the maximum attainable electric field, conditions are created for the generation of runaway electrons that, even at atmospheric pressure, electrons are accelerated to high energies, not experiencing collisions with gas particles.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
The conference “2021 Systems of signals generating and processing in the field of on board communications” is organized with technical sponsorship of Russian (Moscow) IEEE Circuits and Systems (CAS04) Chapter IEEE Region 8, Russian Section Chapter, MTT/ED and Institute of Radio and Information Systems Association (IRIS), Vienna, Austria. The conference featured invited researchers, educators, managers, and graduate students, whose research activity, case studies or best practices, are shedding light on the theory or practice of engineering, include modern digital transportation systems design and technical operation, radio waves propagation, transmitting, receiving and processing signals in television and radio broadcasting devices, information technologies in transport. The main areas of the conference “Systems of signals generating and processing in the field of on board communications” include modern digital transportation systems design and technical operation, radio waves propagation, transmitting, receiving and processing signals in television and radio broadcasting devices, information technologies in transport. FIELD OF INTEREST: Components, Circuits, Devices and Systems; General Topics for Engineers; Signal Processing and Analysis. Reports presented at the conference are grouped in 6 sections: 1. Antennas and Radio Waves Propagation. 2. Navigation and Mathematical Algorithms of an Object Space Orientation. 3. Radiofrequency Applications. 4. Wire and Optical Communication and Control Systems. 5. Intelligent Transport Systems (ITS): Sub-section 1: Use of digital ITS infrastructure in telematic control systems on urban passenger transport Sub-section 2: Peculiarities of data exchange in cooperative ITS Sub-section 3: Theoretical Aspects of Artificial Intelligence Systems Development for Transportation Engineering Sub-section 4: Test methods of motor vehicles integrated into an intelligent transport environment 6. Digital signal processing in on-board radio systems
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.