Address: 34 Tallinskaya Ulitsa
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Boris Glebovich Lvov
Vladimir A. Vetrov
Lev M. Sambursky
The paper the model is considered, allowing to receive realization of an operating time of an electronic component for the set model of its operation. The model was obtained within the limits of those limitations and assumptions that are adopted in regulatory documents on the reliability of electronic components.
A Fermi gas described within the Bardeen-—Cooper—Schrieffer theory (BCS) may be converted into a Bose—Einstein condensate (BEC) of composite molecules (dimers) by adiabatically tuning the interaction. The sequence of the states that appears during this conversion is referred to as the BCS—BEC crossover. The review is devoted to theoretical and experimental results on the BCS—BEC crossover in three- and quasi-two-dimensional resonant quantum gases in the limiting geometry of traps and optical lattices. We shall discuss nontrivial phenomena in the superfluid hydrodynamics of the quantum gases and fluids including the spectrum of collective excitations in the BCS-BEC crossover, hydrodynamics of rotating Bose condensates with a large number of quantized vortices, and the complex unresolved problem of the chiral anomaly in the hydrodynamics of superfluid Fermi systems with anisotropic p-wave pairing. We shall also analyze spin-imbalanced quantum gases and the ability to realize the triplet p-wave pairing via the Kohn-Luttinger mechanism in these gases. The recent results on two-dimensional Fermi-gas preparation and observation of fluctuational phenomena related to the Berezinskii—Kosterlitz—Thouless transition in those gases will also be reviewed. In addition, we shall briefly discuss experimental realization of hexagon optical lattices with Dirac points in selected locations, which connects to the fast progress in the physics of mono- and bilayers of graphene and other Dirac semimetal systems. In addition we shall briefly discuss recently experimentally discovered BCS-BEC crossover and anomalous superconductivity in bilayer graphene and a possible role of graphene and 2D optical lattices as ideal systems for studying all the effects considered in this review.
In this work self-heating effect in SOI MOSFETs with various configuration of buried oxide was investigated using TCAD modeling. The basically electro-thermal transport model built-in to Sentaurus Synopsys tool was complemented by the set of new models for the temperature-dependent physical parameters: thermal conductivities λSi(T), λSiO2(T); oxide and trapped charge densities Nox(T), Nit(T) and others taking into account the special thermal effects that appear in modern deep submicron and nano-scale devices.
Abstract—We have performed computer simulations and experimental studies of characteristics of a standard analog device—the heterodyne employing a printed circuit board (PCB) made from a composite dielectric with a controlled dark conductivity. Simulation results show that an increased conductivity of the PCB smaller than 2 × 10^−7 Ohm^−1 · m^−1 has almost no effect on the operating characteristics of a heterodyne operating in the frequency range of 9–37 MHz, which are in a good agreement with the experimental data. Such PCBs are expected to exclude electrostatic discharges in spacecraft electronic devices otherwise occurring in them due to their internal charging by the ambient space plasma.
The primary purpose of this paper is to provide an overview of existing education solutions for IoT and develop proposals for their improvement. The study draws analysis of current conditions of the educational IoT sphere, a comparative analysis of educational products used for teaching of undergraduate students. With that the article describes the architecture of our own software and hardware platform for learning IOT. Moreover, this paper reviews methods and technical instruments employed to design software and hardware appliances.
In order to assess the level of electronic means reliability, it is necessary to have a methodology for analyzing
the results of calculating its reliability indicators, such as the probability of failure-free operation or mean time between
failures, which allows to evaluate which of the parameters most strongly affects the final value of the failure rate of electronic component particular type. As a result of analyzing the reliability of electronic mean all-levels components, the engineer should obtain the values of the reliability indicators, the boundary values of the controlled parameters, and also give recommendations on certain changes necessary to improve the reliability, thereby implementing the reliability management methodology. This technique, in contrast to the already known ones, will allow analyzing the calculated values of the indicators and using the relative sensitivity function to determine the contribution made by specific parameters: temperature, element ratings, their operating voltage, current, power, tolerance level, while previously contribution was estimated by the numerical value of a separate correction factor. Application
of the developed methodology for analyzing the results of calculating the reliability of electronic means allows to specify the recommendations for changing parameters in order to improve the reliability of the elements that make up the product in question.
The problem of nonuniformity of pore filling in the template synthesis of nanowires is considered. The effect of the applied gradient of temperature on the instability of pore filling is analyzed. The model proposed takes into account the presence of outer thermal boundary layer and outer diffusion layer. The metal electrodeposition in porous template under the quasi-steady-state conditions is considered. The role of the temperature dependences of the exchange current density and the diffusion coefficient of metal cation is revealed. The deposition modes at which the initial dispersion of nanowire lengths can be reduced are determined.
In this review article we consider theoretically and give experimental support to the models of the Fermi-Bose mixtures and the BCS-BEC (Bardeen Cooper Schrieffer–Bose Einstein) crossover compared with the strong-coupling approach, which can serve as the cornerstones on the way from high-temperature to room-temperature superconductivity in pressurized metallic hydrides. We discuss some key theoretical ideas and mechanisms proposed for unconventional superconductors (cuprates, pnictides, chalcogenides, bismuthates, diborides, heavy-fermions, organics, bilayer graphene, twisted graphene, oxide hetero-structures), superfluids and balanced or imbalanced ultracold Fermi gases in magnetic traps. We build a bridge between unconventional superconductors and recently discovered pressurized hydrides superconductors H3S and LaH10 with the critical temperature close to room temperature. We discuss systems with a line of nodal Dirac points close to the Fermi surface and superconducting shape resonances, and hyperbolic superconducting networks which are very important for the development of novel topological superconductors, for the energetics, for the applications in nano-electronics and quantum computations.
The use of improved fabrication technology, highly disordered NbN thin films, and intertwined section topology makes it possible to create high-performance photon-number-resolving superconducting single-photon detectors (PNR SSPDs) that are comparable to conventional single-element SSPDs at the telecom range. The developed four-section PNR SSPD has simultaneously an 86&mn;3%86&mn;3% system detection efficiency, 35 cps dark count rate, ∼2 ns∼2 ns dead time, and maximum 90 ps jitter. An investigation of the PNR SSPD’s detection efficiency for multiphoton events shows good uniformity across sections. As a result, such a PNR SSPD is a good candidate for retrieving the photon statistics for light sources and quantum key distribution systems.
In the paper the content of individual elements (Fe, Co, Zr, Ca and F) contained in nanocomposites FeCoZr ferromagnetic alloy in the CaF2 transparent ceramics dielectric matrix, depending on the content of the metal
phase x was determined by the X-ray diffusion microanalysis (EDX) method. The nanocomposites were made by
sputtering by argon ions. Investigations of changes in the chemical composition of nanocomposites under the
influence of high-temperature treatments were carried out using the thermogravimetry method in the temperature
range from 25 °C to 1000 °C with a temperature increase rate of 10 °C/min. On the basis of the research,
a model of changes of the structural-phase state of nanogranular layers of ferromagnetic alloy Fe45Co45Zr10 in
the transparent ceramics CaF2 matrix occurring under the influence of high-temperature treatments was proposed.
The damage and structural state of the surface layer of Al–Li–Mg samples composed of Al–5% Mg–2% Li (wt %) under pulsed action of power streams of high-temperature deuterium plasma and highenergy deuterium ions in the Plasma Focus (PF) device have been investigated. The radiation power density was q ~ 106 W/cm2; the pulse duration was 50–100 ns. Pulsed thermal heating and rapid cooling is established to lead to the melting and solidification of a thin surface layer of the alloy for several tens of nanoseconds. At the same time, in the superheated surface layer of the alloy, microcavities of a spherical shape are formed which is associated with intense evaporation of lithium into micropores within the heated layer. Thermal stresses caused by abrupt heating, melting, and cooling of a thin surface layer of metal result in formation of microcracks in the near-surface zone of the samples. The evaporation by the power electron beam of the elements of the anode material of the PF device (copper and tungsten) and their subsequent deposition onto the irradiated surface of the investigated samples in the form of droplets of submicron size are noted. It is shown that the thermal and radiationstimulated processes generated in the alloy under the action of pulsed energy fluxes in the implemented irradiation regime lead to the redistribution of elements in the surface layer of the aluminum solution, contributing to an increase in magnesium content and the formation of magnesium oxide on the surface.
A model of the thermo-field electron emission from the metal cathode with a thin insulating surface film at
temperatures of 200–400 K is developed. An expression for the film emission efficiency in the gas discharge is
obtained. The efficiency is equal to the fraction of electrons emitted into the film from the metal substrate,
which enter the discharge volume and increase the effective secondary-electron emission yield of the cathode.
It is shown that the thermo-field mechanism of electron emission influences noticeably the ignition voltage of
the low-current discharge with such cathode at rather low temperatures exceeding the room temperature by
less than 100 K.
The materials of The International Scientific – Practical Conference is presented below. The Conference reflects the modern state of innovation in education, science, industry and social-economic sphere, from the standpoint of introducing new information technologies.
It is interesting for a wide range of researchers, teachers, graduate students and professionals in the field of innovation and information technologies.
Proximity induced quantum coherence of electrons in multi-terminal voltage-driven hybrid normalsuperconducting
nanostructures may result in a non-trivial interplay between topology-dependent
Josephson and Aharonov-Bohm effects. We elucidate a trade-off between stimulation of the voltagedependent
Josephson current due to non-equilibrium effects and quantum dephasing of quasiparticles
causing reduction of both Josephson and Aharonov-Bohm currents. We also predict phase-shifted
quantum coherent oscillations of the induced electrostatic potential as a function of the externally
applied magnetic flux. Our results may be employed for engineering superconducting nanocircuits with
controlled quantum properties.
The study of frequency-dependent intrinsic dissipation in a highly transparent Josephson junction by means of quantum-bit (qubit) spectroscopy is proposed. The spectral density of the effective dissipative bath may contain significant contributions from Andreev bound states coupled to fluctuations of the Josephson phase. Varying either the bias current applied to the junction or magnetic flux through a superconducting ring in the radiofrequency superconducting quantum interference device (rf-SQUID) setup, one can tune the level splitting value close to the bottom of the Josephson potential well. Monitoring the qubit energy relaxation time one can probe the spectral density of the effective dissipative bath and unambiguously identify the contribution emerging from Andreev levels.
Most publications on the theory and practice of creating control systems are devoted to deterministic problems, when the input quantities and output characteristics have deterministic values or functions. In the article, the authors draw attention to the fact that all input and output signals, as well as the internal parameters of control systems, always have random variations. Technological random deviations have parameters for construction materials and electronic components and devices. In addition, the ambient temperature randomly influences the control systems, mechanical effects from the installation object, as well as temporary aging, wear and other factors. The authors draw attention to the insufficient number of publications devoted to the system discussion of probabilistic methods for studying control systems. In this article, the authors not only systematized the methods for studying random variations in the parameters of control systems, but also set forth their unified approach to solving the most frequently encountered problems of studying accuracy, stability, serial seriality and parametric reliability in the case of gradual failure of control systems. The necessary mathematical apparatus is given.
ABSTRACT: An analytic model based on the transport level and effective temperature concepts has been developed to describe consistently both the quasi- and nonequilibrium transport regimes in nonpolar organic solids with the Gaussian uncorrelated energetic disorder. Field and temperature dependences of drift mobility on the nonequilibrium transport regime relating to the time-of-flight experiment are in good agreement with the Monte-Carlo simulation results in a broad range of fields and temperatures using the same set of model parameters for both transport regimes.
The report discusses the use of National Instruments tools for dependability prediction of electronic devices by simulation modeling. The description of the laboratory bench allowing to develop formal models based on reliability block diagrams, to carry out simulation experiment and to process statistical modeling results, is given as well as an example of this bench usage for reliability prediction of power supply of the lightweight spacecraft.