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  Subjects -> ELECTRONICS (Total: 156 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 5)
Advances in Electrical and Electronic Engineering     Open Access  
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 7)
Advances in Microelectronic Engineering     Open Access   (Followers: 9)
Advances in Power Electronics     Open Access   (Followers: 19)
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 188)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 22)
Annals of Telecommunications     Hybrid Journal   (Followers: 7)
Archives of Electrical Engineering     Open Access   (Followers: 11)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 30)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access  
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 39)
China Communications     Full-text available via subscription   (Followers: 7)
Circuits and Systems     Open Access   (Followers: 13)
Consumer Electronics Times     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 88)
Edu Elektrika Journal     Open Access  
Electronic Design     Partially Free   (Followers: 71)
Electronic Markets     Hybrid Journal   (Followers: 8)
Electronic Materials Letters     Hybrid Journal   (Followers: 1)
Electronics     Open Access   (Followers: 56)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Electronics For You     Partially Free   (Followers: 60)
Electronics Letters     Hybrid Journal   (Followers: 23)
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 40)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 3)
Energy Storage Materials     Full-text available via subscription   (Followers: 1)
EPJ Quantum Technology     Open Access  
EURASIP Journal on Embedded Systems     Open Access   (Followers: 12)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 7)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 5)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 124)
Giroskopiya i Navigatsiya     Open Access  
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 52)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 40)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 27)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 7)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 45)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 39)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 46)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 14)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 30)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 11)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 21)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 49)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 6)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 7)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 14)
IET Power Electronics     Hybrid Journal   (Followers: 24)
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 16)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 8)
IETE Technical Review     Open Access   (Followers: 9)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 29)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Informatik-Spektrum     Hybrid Journal   (Followers: 1)
Instabilities in Silicon Devices     Full-text available via subscription  
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 15)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 7)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 17)
International Journal of Antennas and Propagation     Open Access   (Followers: 9)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 4)
International Journal of Computer & Electronics Research     Full-text available via subscription   (Followers: 1)
International Journal of Control     Hybrid Journal   (Followers: 13)
International Journal of Electronics     Hybrid Journal   (Followers: 2)
International Journal of Electronics & Data Communication     Open Access   (Followers: 8)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 11)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 1)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 8)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 6)
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Numerical Modelling:Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 3)
International Journal of Power Electronics     Hybrid Journal   (Followers: 12)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 7)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 5)
International Journal on Communication     Full-text available via subscription   (Followers: 12)
International Journal on Electrical and Power Engineering     Full-text available via subscription   (Followers: 7)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 4)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 7)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 2)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription  
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 15)
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 6)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 5)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 3)
Journal of Electronics (China)     Hybrid Journal   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription  
Journal of Field Robotics     Hybrid Journal   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Full-text available via subscription   (Followers: 118)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 6)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 3)
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 9)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 2)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 30)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 7)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Sensors     Open Access   (Followers: 19)
Journal of Signal and Information Processing     Open Access   (Followers: 8)
Jurnal Rekayasa Elektrika     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 14)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Metrology and Measurement Systems     Open Access   (Followers: 4)
Microelectronics and Solid State Electronics     Open Access   (Followers: 13)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 32)
Nanotechnology, Science and Applications     Open Access   (Followers: 3)
Networks: an International Journal     Hybrid Journal   (Followers: 4)
Open Journal of Antennas and Propagation     Open Access   (Followers: 4)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 13)
Paladyn, Journal of Behavioral Robotics     Open Access  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Patents on Electrical & Electronic Engineering     Full-text available via subscription   (Followers: 5)
Recent Patents on Telecommunications     Full-text available via subscription   (Followers: 2)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 4)
Security and Communication Networks     Hybrid Journal   (Followers: 3)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 47)
Semiconductors and Semimetals     Full-text available via subscription  
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 1)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 55)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 9)
Solid-State Electronics     Hybrid Journal   (Followers: 6)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 1)
Technical Report Electronics and Computer Engineering     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 5)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 5)
Visión Electrónica : algo más que un estado sólido     Open Access  
Wireless and Mobile Technologies     Open Access   (Followers: 5)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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Journal Cover Radiophysics and Quantum Electronics
  [SJR: 0.336]   [H-I: 11]   [2 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-9120 - ISSN (Online) 0033-8443
   Published by Springer-Verlag Homepage  [2335 journals]
  • Wave Effects Related to Altitude Variations in the Ion Composition of the
    • Authors: D. I. Vavilov; D. R. Shklyar
      Pages: 519 - 534
      Abstract: Properties of the waves, which can propagate in a magnetized plasma in the frequency range below the proton gyrofrequency, depend strongly on the ion composition of the plasma. Addition of a new sort of ions leads to the appearance of a new resonance frequency, at which the refractive index becomes infinite, and a new cutoff frequency, at which the refractive index becomes zero. In this case, the topology of frequency dependence of the squared refractive index changes. Specifically, a new oscillation branch appears, which is located above the cutoff frequency. A question arises whether these oscillations are excited if radiation with the corresponding frequency, which propagates in a different mode, is present in the plasma. A linear transformation of the waves is another important effect, which is related to variations in the ion plasma composition. These two issues, which are directly related to the theory of formation of proton whistlers in the ionosphere, where the ion composition varies with altitude, are considered in this work.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9720-8
      Issue No: Vol. 59, No. 7 (2016)
  • Long-Term Global Distributions of Mesoscale Variations in Atmospheric
           Radio Refraction Obtained from the GPS Champ Satellite Data
    • Authors: N. M. Gavrilov; R. O. Manuilova
      Pages: 535 - 545
      Abstract: We obtain average global distributions of the variances of the mesoscale variations in the atmospheric radio-refraction index (refractive index) at altitudes of 5–35 km from the data of the radio-occultation experiments performed during operation of the low-orbit GPS CHAMP satellite in the period 2001–2009. The filtering of the vertical profiles of the radio-refraction index allows one to determine the variances of the variations with vertical scales below 8 km. The latitudinal-temporal distributions of the zonal-mean variances of the index demonstrate significant interannual variations at various altitudes. Seasonal variations in the variances of radio refraction are studied. Quasi-biennial oscillations at low latitudes are revealed. Acoustic-gravity waves and turbulent and convective motions in the atmosphere can cause a spread of the radio-refraction index.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9721-7
      Issue No: Vol. 59, No. 7 (2016)
  • Determination of the Trace-Gas Concentrations at the Altitudes of the
           Lower and Middle Mesosphere from the Time Series of Ozone Concentration
    • Authors: A. A. Nechaev; T. S. Ermakova; M. Yu. Kulikov
      Pages: 546 - 559
      Abstract: We present a statistical (Bayesian) approach to retrieving the concentrations of the most important mesospheric trace gases at altitudes of 50–75 km using the photochemical model based on the time series of ozone concentration, which are measured during the daylight hours in one day with the help of the ground-based passive microwave devices. Using the model noisy time series of ozone concentration with allowance for the realistic accuracy of its measurements in the mesosphere, which is ensured by the available ozonometers, the accuracy of retrieving the non-measurable mesospheric characteristics is studied as a function of the altitude and the time-series length.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9722-6
      Issue No: Vol. 59, No. 7 (2016)
  • Fractal Model of a Compact Intracloud Discharge. II. Specific Features of
           Electromagnetic Emission
    • Authors: S. S. Davydenko; D. I. Iudin
      Pages: 560 - 575
      Abstract: We examine the features of the electromagnetic emission of a compact intracloud discharge (CID) within the framework of the fractal approach [1] described in the first part of the article. Compact intracloud discharge is considered as the result of electric interaction of two bipolar streamer-type structures previously developed in the regions of a strong electric field inside the thundercloud. To estimate the electromagnetic emission of the discharge, the complex tree-like structure of the electric currents at the preliminary and main stages of CID was represented as the sum of a relatively slowly varying large-scale linear mean component and fast small-scale constituents corresponding to the initial formation of elementary conductive channels of the discharge tree. Mean linear current of the discharge is considered as an effective source of the VLF/LF emission at both the preliminary and main stages of a CID. Electrostatic, induction, and radiation components of the electric field at different distances from the mean current are calculated taking into account specific features of both stages of the discharge within the framework of the transmission-line model. It is shown that at the preliminary stage only the electrostatic component can mainly be detected, whereas at the main stage all the above components of the electric field can be reliably measured. Dependence of the radiation electric field at the main stage on the length of the discharge channel and propagation velocity of the current front is analyzed. It is found that due to the bi-directional expansion of the current at the main stage of a CID the radiation field pulse remains narrow in a wide range of discharge parameters. The small-scale currents corresponding to the initial breakdown between the neighboring cells of the discharge domain are considered as the sources of HF/VHF radiation. It is shown that HF/VHF emission at the preliminary stage is negligible as compared to emission at the main stage. It is also established that at the main stage, first, the HF/VHF emission burst correlates well with the initial peak of the VLF/LF electric field pulse and, second, its spectrum corresponds to the power law with an exponent between −2 and −1.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9723-5
      Issue No: Vol. 59, No. 7 (2016)
  • Influence of Oceanic Synoptic Eddies on the Duration of Modal Acoustic
    • Authors: D. V. Makarov; L. E. Kon’kov; P. S. Petrov
      Pages: 576 - 591
      Abstract: We consider the problem of scattering of the modal acoustic pulses from synoptic eddies with allowance for the influence of the field of internal waves. The ray formalism in terms of the action–angle variables is used. The synoptic-eddy induced distortion of the sound-speed profile is shown to enhance the scattering of certain ray bundles from internal waves. The formulas allowing one to identify the modal pulses corresponding to such ray bundles are derived. These pulses differ from the other ones by increased duration. This fact can be used for obtaining additional information during acoustic tomography. The model of the underwater acoustic channel in the Sea of Japan is considered as an example.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9724-4
      Issue No: Vol. 59, No. 7 (2016)
  • Limiting and Fedosov’s Currents of a Strongly Magnetized Electron Beam
           in Asymmetric Transportation Channels
    • Authors: M. B. Goikhman; A. V. Gromov; N. F. Kovalev; A. V.Palitsin
      Pages: 592 - 595
      Abstract: We consider the properties of thin-walled, strongly magnetized electron beams in closed evacuated transportation channels with arbitrary cross sections of the channel and the electron beam. Explicit precise formulas are obtained for the limiting and Fedosov’s currents of such electron beams. The found relationships allow one to explain many observed phenomena and can serve as a basis for verification of the results of more complicated calculations.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9725-3
      Issue No: Vol. 59, No. 7 (2016)
  • Spatial Instability of the Linearly Polarized Plane Wave in a Cubic
    • Authors: M. S. Kuz’mina; E. A. Khazanov
      Pages: 596 - 604
      Abstract: We study theoretically the development of a small-scale spatial instability of a plane wave in a cubic crystal with [111], [001] and [101] orientations. It is shown that in the [111] oriented crystals the instability develops at lower intensities than in the [001] and [101] oriented crystals. In the latter two crystals, the instability can significantly be suppressed by choosing the optimal radiation polarization. It is found that in the case of a small B integral, the method of temporal contrast enhancement of laser pulses by generating an orthogonal polarization achieves the largest efficiency with the [101] orientation, while the [001] orientation is more preferable for B > 3.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9726-2
      Issue No: Vol. 59, No. 7 (2016)
  • Ionospheric Effects of a Solar Eclipse of March 20, 2015 on Oblique
           Sounding Paths in the Eurasian Longitudinal Sector
    • Authors: V. P. Uryadov; A. A. Kolchev; F. I. Vybornov; V. V. Shumaev; A. I. Egoshin; A. G. Chernov
      Pages: 431 - 441
      Abstract: The results of measuring HF signals on oblique chirp sounding paths in the Eurasian region during a solar eclipse of March 20, 2015 and the neighboring days are presented. The solar eclipse took place against the background of a strong magnetic storm. It was established that during the solar eclipse on oblique sounding paths of different length and orientation the decrease in the maximum observable frequency for the F mode (MOF-F) and the lowest observable frequency for the F mode (LOF-F) was 8–14% and 22–33%, respectively. During the eclipse, the signal amplitude increased by 3–5 dB. On the Lovozero—Nizhny Novgorod path in the maximum phase of the solar eclipse, the electron density decrease in the ionospheric E and F2 layers at the midpoint of the path reached 37% and 22%, respectively. According to the MOF and LOF variation measurements for various modes, the group delay time of radio signals, and the results of spectral analysis, it was found that in the eclipse there were wave disturbances with a period of 25 to 50 min. However, quasi-periodic variations of MOF-F and LOF-F having a a period of 50 to 80 min but which started before the eclipse were detected on some paths. Probably, in these cases, the variations were a result of the superposition of disturbances from two sources, namely, the magnetic storm and the solar eclipse.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9711-9
      Issue No: Vol. 59, No. 6 (2016)
  • Multistability of the Roller Structures of Parametrically Excited
           Capillary Waves in the Case of Polygonal Boundaries
    • Authors: S. V. Kiyashko; V. O. Afenchenko; A. V. Nazarovsky
      Pages: 442 - 448
      Abstract: We experimentally study the dynamics of the roller structures of the parametrically excited capillary waves with polygonal boundaries. The possibility of existence of many stable roller regimes, which differ only by the roller orientation in space, is revealed. Their stability in the case of the roller angular deviation from the equilibrium state is studied. The model of the observed phenomenon is proposed. The numerical calculations performed on the basis of this model are in good agreement with experimental results.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9712-8
      Issue No: Vol. 59, No. 6 (2016)
  • Generalized Discrete Model of Systems with Distributed Feedback Based on
           Surface Acoustic Waves
    • Authors: B. V. Sveshnikov; A. S. Bagdasaryan
      Pages: 449 - 460
      Abstract: We have developed a self-consistent physical model that improves the accuracy of calculating the characteristics of the devices based on both surface and pseudosurface acoustic waves. The model is free from restrictions inherent in the well-known method of coupled modes and other phenomenological methods for studying distributed systems. The compact relationships describing all the characteristics of the acoustoelectric transducers of all types with allowance for the possible directionality of their radiation and its propagation loss are obtained using analytical solution of the difference equations. The method for determining the spatial orientation of the elastic-polarization ellipse in an anisotropic crystal, which allows one to unambiguously calculate the phase shift between the oscillations of two coupled dynamical subsystems, i.e., elastic displacements and the corresponding electric field, is proposed. The obtained results, which considerably facilitate the task of fast and accurate design of various devices on the basis of surface and pseudosurface acoustic waves, are valid in the general case for any frequency, including the harmonics of the frequency of the fundamental acoustic synchronism.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9713-7
      Issue No: Vol. 59, No. 6 (2016)
  • Mechanisms of Čerenkov Superradiance of Extended Electron Bunches in
           Oversized Corrugated Waveguides
    • Authors: N. S. Ginzburg; V. Yu. Zaslavsky; I. V. Zheleznov; I. V. Zotova; A. M. Malkin; A. S. Sergeev; E. R. Kocharovskaya; M. I. Yalandin
      Pages: 461 - 470
      Abstract: We propose to use the effect of Čerenkov superradiance of the electromagnetic field by extended electron bunches, which move linearly in oversized corrugated waveguides, for generation of multimegawatt subnanosecond pulses in the short-wave part of the millimeter-wavelength band. Various mechanisms of generation of superradiance pulses are considered, including excitation of volume waves in the case of electron synchronism with a decelerated spatial harmonic, as well as excitation of copropagating and counterpropagating surface waves. The analysis was performed both within the framework of the quasioptical approximation and on the basis of direct modeling by the particle-in-cell method.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9714-6
      Issue No: Vol. 59, No. 6 (2016)
  • Gain and Efficiency of a Superconducting Microwave Compressor with a
           Switching Cavity in an Interference Switch
    • Authors: S. N. Artemenko; G. M. Samoylenko
      Pages: 471 - 478
      Abstract: We study the processes of radiation output from a microwave storage cavity through a superconducting interference switch, which is based on a H-junction with a superconducting switching cavity connected to the side branch of the junction for various ways of controlling the parameters of the switching cavity. It is shown that efficient control over radiation output in such a switch can be achieved by varying the resonance frequency or Q-factor of the switching cavity, as well as by varying these parameters simultaneously. It is found that in the case of controlling the resonance frequency of the switching cavity, there exists an optimal interval of the frequency variation, within which the total efficiency and extraction efficiency are maximum. When the Q-factor of the switching cavity changes, the dependence of the total efficiency and extraction efficiency on the Q-factor has the monotonic character. The mixed regime of radiation output control is also studied. The envelopes of the output compressor pulses are plotted on the basis of recurrent relationships between the amplitudes of the waves in the system for three regimes of switch operation. It is shown that pulses with an almost rectangular shape of the envelope can be formed in the regime of controlling the switching cavity by varying the Q-factor. An example of possible realization of the switching cavity is considered.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9715-5
      Issue No: Vol. 59, No. 6 (2016)
  • Studying the Influence of Opening Angles of Planar Short Slot Microwave
           Antennas on Their Electrodynamic Characteristics
    • Authors: V. P. Zayarny; S. A. Parpula; V. S. Girich; I. N. Ponomarev
      Pages: 479 - 483
      Abstract: We study the characteristics of planar symmetric slot antennas with linearly expanding openings, whose dimensions are comparable with a radiation wavelength of 30 mm. The radiation patterns of the antennas under consideration are calculated experimentally, measured experimentally, and analyzed for opening angles of 60°, 90°, and 120°. The influence of the antenna opening angle on the directivity of the antennas is revealed. The experimentally measured antenna radiation patterns are found to agree well with the developed mathematical models at the frequencies (10 ± 2) GHz.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9716-4
      Issue No: Vol. 59, No. 6 (2016)
  • Regimes of Generation in Low-Q Distributed-Feedback Lasers with Strong
           Inhomogeneous Broadening of the Active Medium
    • Authors: E. R. Kocharovskaya; N. S. Ginzburg; A. S. Sergeev; V. V. Kocharovsky; Vl. V. Kocharovsky
      Pages: 484 - 500
      Abstract: We study the influence of the ratio between the relaxation rates of the field in a cavity and the polarization of active centers on the dynamic properties of the distributed-feedback lasers by means of 1D numerical simulation. The model of a two-level active medium with strong inhomogeneous broadening of the spectral line under CW wide-band pumping that provides two- or several-mode lasing in the vicinity of the Bragg photonic band gap is used. Evolution of the dynamic spectra and oscillograms of the laser emission with decreasing Q-factor of the Bragg resonator is analyzed. It is shown, in particular, that under conditions of the dominant role of the superradiant effects, there are unique opportunities for control of both quantitative and qualitative characteristics of lasing, including the spectral width, duration, and coherence length of various pulse components of the output radiation.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9717-3
      Issue No: Vol. 59, No. 6 (2016)
  • The ⋋ Structure of the Heat Capacity of an Ideal Gas in the Critical
           Region of Bose–Einstein Condensation for Various Mesoscopic Traps
    • Authors: S. V. Tarasov
      Pages: 501 - 514
      Abstract: The features of the ⋋ structure of the heat capacity of an ideal gas of Bose atoms, which is confined in arbitrarily shaped and sized mesoscopic traps, are considered on the basis of a general exact description of the Bose–Einstein condensation. The main attention is paid to the boundarycondition role in the critical region, in which the heat capacity is described by a self-similar function that is sensitive to perturbations of the confining potential and the boundary-condition variation. Various traps, which allow one to experimentally study the influence of the boundary conditions on the shape of the ⋋ structure of the heat capacity and observe variations in other thermodynamic parameters due to the corresponding rearrangement of the self-similar structure of the critical region, are considered.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9718-2
      Issue No: Vol. 59, No. 6 (2016)
  • Correct Determination of Hysteresis of Nonlinear Current-Voltage
           Characteristics of Spin Valves, Magnetic Tunnel Junctions, or Memristors
    • Authors: E. S. Demidov
      Pages: 515 - 518
      Abstract: Until now, significant progress has been made in synthesizing the current-switched structure of spin valves and magnetic tunnel junctions with hysteresis dependences of the resistance on the current. These structures are of interest for creation of small-size electronic memory. However, hysteresis of resistance, which is usually presented in publications, does not correspond to physical principles. In this paper, we show how the hysteresis dependence of the resistance on the current, or the conductance on the voltage, which does not contradict the energy conservation law, and the corresponding current–voltage characteristic should look like. As an example, we present the experimental current–voltage characteristic of the CO2MnSi/MgO/Co2MnSi magnetic tunnel junction, which agrees with the model hysteresis dependences.
      PubDate: 2016-11-01
      DOI: 10.1007/s11141-016-9719-1
      Issue No: Vol. 59, No. 6 (2016)
  • Variability of the Tropospheric-Delay Temporal Structure Function of Radio
           Signals from the Global Navigation Satellite Systems Versus Tropospheric
           Surface Layer Parameters
    • Authors: V. E. Khutorov; G. M. Teptin; A. A. Zhuravlev; O. G. Khutorova
      Pages: 352 - 360
      Abstract: We present the results of a four-year (2009–2012) study of the decimeter radio wave propagation using signals from the global navigation satellite system (GNSS) and simultaneous measurements of the tropospheric surface layer parameters in the city of Kazan. Inter- and intra-annual variabilities of the temporal structure functions of the zenith tropospheric delay (ZTD) of decimeter radio waves are analyzed. It has been found that the contribution of irregularities with time scales of up to 24 h to the ZTD fluctuation variance varies, depending on the surface weather parameters (temperature and pressure). Correlation coefficient between the approximation exponents of the ZTD temporal structure function of decimeter radio waves and surface temperature reaches 0.77 for fluctuations with time scales of up to 8 h. It has been established that synoptic processes and the underlying surface affect the formation of mesoscale fluctuations on the phase path of radio signals from the navigation satellite systems.
      PubDate: 2016-10-01
      DOI: 10.1007/s11141-016-9704-8
      Issue No: Vol. 59, No. 5 (2016)
  • Frequency Domain Criterion of Appearance of an Electromagnetic Surface
           Wave Above the Laminar Ice—Salt Water Structure
    • Authors: Yu. B. Bashkuyev; L. Kh. Angarkhaeva; I. B. Naguslayeva; V. B. Khaptanov; M. G. Dembelov; D. G. Buyanova
      Pages: 361 - 368
      Abstract: We propose a frequency domain criterion for appearance of an electromagnetic surface wave above the laminar ice—salt water structure and substantiate it theoretically and experimentally. It is found that an ice layer on the ocean surface increases the surface impedance modulus and shifts its phase to the domain corresponding to strongly inductive impedances (with a phase of up to −88°). We show that due to the presence of a thin low-conductivity ice layer on the ocean surface, an additive component appears in the ocean water impedance, which depends on the thickness of the ice layer linearly and shifts the impedance phase to the region corresponding to strong inductance. In this case, electric properties of the ice layer have almost no influence on the change in the impedance. The ice layer has a great influence on the electromagnetic field, which can be greater over the ice-covered ocean compared with the field over an infinitely conducting plane. The field increase effect is due to the electromagnetic surface wave.
      PubDate: 2016-10-01
      DOI: 10.1007/s11141-016-9705-7
      Issue No: Vol. 59, No. 5 (2016)
  • A New Principle for Construction of Microwave Multireceiver Radiometers
           Using a Modified Method of Zero Measurement
    • Authors: A. V. Filatov
      Pages: 382 - 392
      Abstract: We consider a microwave multireceiver radiometer based on in-parallel operated receiving channels using the principle of zero balance and measuring the antenna signal by all receivers in the same spectral range with time division. This yields a higher fluctuation sensitivity than in the case of an ideal full-power compensation radiometer while achieving a high stability of measurements by a modified method of zero measurement.
      PubDate: 2016-10-01
      DOI: 10.1007/s11141-016-9707-5
      Issue No: Vol. 59, No. 5 (2016)
  • A New Method for Finding Optical Aberrations on the Basis of Analysis of
           the Object Hologram Without Additional Measurements
    • Authors: V. A. Matkivsky; A. A. Moiseev; P. A. Shilyagin; D. V. Shabanov; G. V. Gelikonov; V. M. Gelikonov
      Pages: 393 - 404
      Abstract: We propose a new method of compensating for the wavefront aberrations during the image processing. The method employs the digital-holography potential. The developed algorithms allow one to find the wavefront distortions caused by the optical-path nonuniformities during the interference recording of images without additional measurements (i.e., without using the reference point source and measuring the wavefront distortions). The possibility of decreasing the wavefront aberrations from tens to several radians using digital methods is demonstrated.
      PubDate: 2016-10-01
      DOI: 10.1007/s11141-016-9708-4
      Issue No: Vol. 59, No. 5 (2016)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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