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  Subjects -> ELECTRONICS (Total: 155 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 6)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Microelectronic Engineering     Open Access   (Followers: 11)
Advances in Power Electronics     Open Access   (Followers: 24)
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 214)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 24)
Annals of Telecommunications     Hybrid Journal   (Followers: 7)
Archives of Electrical Engineering     Open Access   (Followers: 12)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
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: 41)
China Communications     Full-text available via subscription   (Followers: 7)
Circuits and Systems     Open Access   (Followers: 14)
Consumer Electronics Times     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 175)
Edu Elektrika Journal     Open Access  
Electronic Design     Partially Free   (Followers: 75)
Electronic Markets     Hybrid Journal   (Followers: 8)
Electronic Materials Letters     Hybrid Journal   (Followers: 2)
Electronics     Open Access   (Followers: 58)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Electronics For You     Partially Free   (Followers: 62)
Electronics Letters     Hybrid Journal   (Followers: 24)
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: 135)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 54)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 47)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 32)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 8)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 49)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 46)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 49)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 17)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 32)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 14)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 26)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 55)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 7)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 14)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 7)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 16)
IET Power Electronics     Hybrid Journal   (Followers: 29)
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 17)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 11)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 38)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
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: 16)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 7)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
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 Control     Hybrid Journal   (Followers: 13)
International Journal of Electronics     Hybrid Journal   (Followers: 3)
International Journal of Electronics & Data Communication     Open Access   (Followers: 11)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 12)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 2)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 10)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 6)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 3)
International Journal of Power Electronics     Hybrid Journal   (Followers: 14)
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: 8)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 8)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 3)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 16)
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: 6)
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: 131)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 7)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 6)
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: 31)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 9)
Journal of Semiconductors     Full-text available via subscription   (Followers: 3)
Journal of Sensors     Open Access   (Followers: 21)
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)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 1)
Metrology and Measurement Systems     Open Access   (Followers: 4)
Microelectronics and Solid State Electronics     Open Access   (Followers: 14)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 31)
Nanotechnology, Science and Applications     Open Access   (Followers: 4)
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Journal of Antennas and Propagation     Open Access   (Followers: 5)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 14)
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: 9)
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: 48)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 62)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 11)
Solid-State Electronics     Hybrid Journal   (Followers: 7)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 7)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
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: 12)
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  [2345 journals]
  • Localized Superconductivity in Systems with Inhomogeneous Mass of Cooper
           Pairs
    • Authors: A. A. Kopasov; D. A. Savinov; A. S. Mel’nikov
      Abstract: Within the framework of the Ginzburg–Landau theory, we study the features of the localized nucleation of the order parameter in superconducting systems with inhomogeneous effective mass m of the Cooper pairs, which is due to the spatial modulation of the diffusion coefficient and/or fluctuations in the local anisotropy axis in the sample. In the asymptotics of the weak magnetic fields H, for which the magnetic length [Φ0/(2πH)]1/2, where Φ0 is the magnetic-flux quantum, is much shorter than the inhomogeneity scale, the spatial scale of the order parameter is determined by the sample-average coherence length and the regular lattice of the Abrikosov vortices is formed in the superconductor. In sufficiently strong magnetic fields H, the order parameter is localized near the minima of the coherence length ξ ∝ m −1/2, which results in an increase in the critical temperature and destruction of the regular lattice of the Abrikosov vortices. Therefore, competition between the two superconductivity-nucleation types is observed during a gradual increase in the magnetic field, which leads to the positive curvature of the phase-transition line. We have also studied the features of the temperature dependences of the upper critical magnetic field for some model spatial mass profiles of the Cooper pairs. The obtained results are in good agreement with direct numerical calculations.
      PubDate: 2017-05-19
      DOI: 10.1007/s11141-017-9761-7
       
  • On the Origin of Intense Radio Emission from the Brown Dwarfs
    • Authors: V. V. Zaitsev; A. V. Stepanov
      Abstract: Observations of quasi-periodic intense radio emission at 2–8 GHz from the brown dwarfs with a brightness temperature of up to Tb ∼ 1013 K and with a fairly narrow radiation pattern initiated a series of studies in which the radiation was interpreted in terms of the electron cyclotron maser emission generated by energetic electrons with the “loss cone.” The plasma mechanism of the radio emission was excluded from consideration because it requires that the electron plasma frequency should exceed the electron gyrofrequency in the source of the radio emission, i. e., νp > νc. In this paper, we propose a coherent plasma radiation mechanism for intense radio emission from the brown dwarfs. The possibility of the formation of hot extended coronae in the magnetic loops that occur in the atmospheres of the brown dwarfs as a result of the photospheric convection is shown. The electric currents generated in the magnetic loops by photospheric convection lead to the plasma heating and elevation of the “squeezed” atmosphere. This ensures that the condition νp > νce required for the plasma mechanism of radio emission is fulfilled at the coronal levels. In addition, the pumping mechanism supplying energetic particles into the coronae of the brown dwarfs, which maintain the long-term generation of intense radio emission from these stars, is studied. The parameters of the Langmuir turbulence explaining the observed properties of the radio emission from the brown stars are determined.
      PubDate: 2017-05-19
      DOI: 10.1007/s11141-017-9757-3
       
  • Diagnostics of the Generation, Decay, and Transport of Artificial Plasma
           Perturbations by Means of Short Pulses of High-Power Radio Waves
    • Authors: E. N. Sergeev; S. M. Grach; V. L. Frolov; A. V. Shindin
      Abstract: We discuss the techniques of measuring and the possibilities of using short pulses of high-power radio waves for diagnostics of the properties of high- and low-frequency ionospheric plasma turbulence. The results of the experimental studies performed using the Sura heating facility are presented.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9758-2
       
  • Solution of the Inverse Problem of the Transfer of Ultrarelativistic
           Nuclei in the Expanding Universe
    • Authors: V. N. Zirakashvili; V. S. Ptuskin; S. I. Rogovaya
      Abstract: We consider propagation of nuclei with energies over 1018 eV in the expanding Universe filled with background electromagnetic radiation. The spectrum of sources of extragalactic cosmic rays for protons and nuclei up to iron is determined on the basis of the particle spectrum observed near Earth as a solution of the inverse problem of transfer of ultrarelativistic nuclei. The method of regularization of the solution of this mathematically ill-posed problem is used basing on the data of the Pierre Auger Observatory on the energy spectrum of cosmic rays, the average logarithm of the mass number, and its variance. The found energy spectra of the sources prove to be very hard and strongly dependent on the assumption about the composition of the accelerated nuclei.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9756-4
       
  • Compression of the Waveform of a Gamma Photon Into a Train of Short Pulses
           in an Optically Dense Oscillating Mössbauer Absorber
    • Authors: V. A. Antonov; I. R. Khairulin; Y. V. Radeonychev; O. A. Kocharovskaya
      Abstract: We study the potential of a method for manipulating the spectral-temporal characteristics of the Mössbauer γ photon on the basis of resonant interaction of the electromagnetic field of a single photon with an oscillating nuclear absorber. It is shown that the absorber enrichment by a resonant nuclide and an increase in its optical density allow one to considerably increase the peak probability of detecting the photon behind the absorber and improve the obtained-pulse shape. The estimates for the γ radiation of the Mössbauer nuclide 57Co with a photon energy of 14.4 keV and a lifetime of 141 ns of the excited state, which interacts with the oscillating resonant absorber enriched by the 57Fe nuclei, are given and the possibility of compressing the waveform of an incident photon into a train of pulses with durations of 10 ns and peak intensity two times exceeding that in the absence of the absorber is shown.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9763-5
       
  • Simulation of Nonrelativistic Jet Ejections During the Laboratory Studies
    • Authors: V. S. Beskin; Ya. N. Istomin; A. M. Kiselev; V. I. Krauz; K. N. Mitrofanov; V. V. Myalton; E. E. Nokhrina; D. N. Sob’yanin; A. M. Kharrasov
      Abstract: We discuss a possibility of simulating nonrelativistic jet ejections during the laboratory experiment using the PF-3 facility. It is shown that many properties of the flows obtained with the help of the experimental facility agree with the basic characteristics of the jet ejections which are observed in the neighborhood of young stars. The future experiments, which can allow one to understand the nature of the stable plasma ejections observed in many astrophysical sources, are discussed.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9760-8
       
  • Oblique Sounding of the Ionosphere by Means of an
           Ionosonde–Direction Finder with Chirp Signal
    • Authors: G. G. Vertogradov; V.P. Uryadov; M. S. Sklyarevsky; V. A. Valov
      Abstract: We give a mathematical rationale, an algorithm, and hardware implementation for a multichannel ionosonde–direction finder with chirp signal. The results of experimental studies of twodimensional angle–frequency characteristics on the Cyprus—Rostov-on-Don meridional obliquesounding path are presented. It is shown that both regular (terminator-related) and irregular (caused by the passage of a traveling ionospheric disturbance through the propagation path) transverse (with respect to the propagation path) horizontal gradients of the electron number density lead to a deviation of the azimuth of the high-angle ray in the direction of the Ne gradient. The experimental data are compared with the simulation results.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9759-1
       
  • Josephson Traveling-Wave Antennas
    • Authors: V. V. Kurin; N. K. Vdovicheva; I. A. Shereshevskii
      Abstract: We propose a new approach to the problem of obtaining coherent radiation from systems with a great number of Josephson junctions, which is based on the concept of traveling-wave antennas. The traveling wave in a line ensures identity of the electrodynamic conditions, under which the junctions operate, whereas the energy leakage to radiation in the lateral direction prevents saturation of the nonlinearity of the individual junctions having a small dynamic range. Simple analytical models, which demonstrate feasibility of the traveling-wave regime, are considered. A code for direct numerical simulation of Josephson microchips including microantennas, lumped elements, and power supply circuits have been developed. Using the direct numerical simulation, a version of the Josephson antenna, which is similar to the simplest single-wire antenna, is studied and the possibility to realize the traveling-wave regime is demonstrated.
      PubDate: 2017-05-18
      DOI: 10.1007/s11141-017-9762-6
       
  • Erratum to: Quasi-Periodic Variations in the Doppler Shift of HF Signals
           Scattered by Artificial Ionospheric Turbulence
    • Authors: A. F. Belenov; P. V. Ponomarenko; V. G. Sinitsyn; Yu. M. Yampol’skii
      PubDate: 2017-04-26
      DOI: 10.1007/s11141-017-9755-5
       
  • Equivalent Schemes of a Resistive Hot-Carrier Sensor for Measurements of
           the Parameters of Output Radiation of Relativistic Microwave Generators
    • Authors: M. B. Goykhman; A. V. Gromov; N. F. Kovalev; A. V. Palitsin
      Abstract: We have developed equivalent schemes of high-frequency hot-carrier detectors, which allow one to measure the parameters of output radiation of relativistic microwave generators with higher accuracy, as well as to solve the problems of optimization of the design of such detectors and the ways of connecting them into external circuits.
      PubDate: 2017-04-26
      DOI: 10.1007/s11141-017-9749-3
       
  • Degenerate Parametric Interaction in Intense Acoustic Beams
    • Authors: S. N. Gurbatov; M. S. Deryabin; D. A. Kas’yanov; V. V. Kurin
      Abstract: We consider degenerate parametric interaction in intense acoustic beams. It is shown that the field at large times has universal structure which is determined only by the wave period. At the same time, the distance in which this universal waveform is formed strongly depends on the fine structure of the initial field. The main part of this work is devoted to an experimental study of degenerate interaction in the intense acoustic beams. The employed experimental tools allow one to change the phase relationships among the radiated signals and study the processes of formation of the universal signal waveform at large distances, depending on the initial conditions.
      PubDate: 2017-04-26
      DOI: 10.1007/s11141-017-9748-4
       
  • Relationship Between the Parameters of the Linear and Nonlinear Wave
           Generation Stages in a Magnetospheric Cyclotron Maser in the Backward-Wave
           Oscillator Regime
    • Authors: A. G. Demekhov
      Abstract: By using numerical simulations we generalize certain relationships between the parameters of quasimonochromatic whistler-mode waves generated at the linear and nonlinear stages of the cyclotron instability in the backward-wave oscillator regime. One of these relationships is between the wave amplitude at the nonlinear stage and the linear growth rate of the cyclotron instability. It was obtained analytically by V.Yu.Trakhtengerts (1984) for a uniform medium under the assumption of constant frequency and amplitude of the generated wave. We show that a similar relationship also holds for the signals generated in a nonuniform magnetic field and having a discrete structure in the form of short wave packets (elements) with fast frequency drift inside each element. We also generalize the formula for the linear growth rate of absolute cyclotron instability in a nonuniform medium and analyze the relationship between the frequency drift rate in the discrete elements and the wave amplitude. These relationships are important for analyzing the links between the parameters of chorus emissions in the Earth’s and planetary magnetospheres and the characteristics of the energetic charged particles generating these signals.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9746-6
       
  • Using the Risk Function in the Problem of Detection of Radiophysical
           Sounding Signals
    • Authors: A. A. Kolchev; I. A. Egoshin
      Abstract: We propose a model of a two-component mixture for the statistical description of a radiophysical sounding signal at the output of the receiver of a signal with linear frequency modulation. Within this framework, it is found that the risk function can be used to detect readings of the second component in the mixture for small reading amounts. The method for detection of the second mixture component by using the risk function of the mixture on the basis of learning samples is proposed and tested experimentally for the first time.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9753-7
       
  • Dielectric Losses in Supercooled Pore Water at a Frequency of 34 GHz
    • Authors: G. S. Bordonsky; A. O. Orlov; K.A. Schegrina
      Abstract: We present the results of measuring the coefficient of specific attenuation in supercooled water in the pores of silica gel at a frequency of 34 GHz in the temperature range from +20°C to −190°C. It is shown that in moistened silica gel with nanosized pores, noticeable radiation losses occur down to a temperature of about −100°C. This is due to the presence of a certain amount of liquid water in the pore space. Part of the water, which is strongly bound with the surface of the pores, does not freeze at temperatures down to −136°C, at which vitrification takes place. The properties of the other fraction, which is weakly bound with the surface are close to that for the volumetric water, i.e., it crystallizes completely on being cooled down to the critical temperature −(38–45)°C, which is determined by the properties of the surrounding medium. Absorption of the electromagnetic radiation in supercooled water captures in pores should be allowed for, e.g., in the problems of radiation transfer in an atmospheric moistened aerosol, especially in the millimeter wavelength band.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9750-x
       
  • Application of the Power-Vector Method for Adaptive Signal Processing in
           Multibeam Antenna Arrays
    • Authors: V. T. Ermolayev; V. Yu. Semenov; I. S. Sorokin; A. G. Flaksman
      Abstract: We consider an adaptive antenna array, which forms a great number of beams for the parallel or successive observation of space and ensures the maximum ratio of the signal power to the mean noise power at the output. An algorithm for adaptive signal processing in the basis of the power vectors is proposed and the regularized estimates of the weight vectors are obtained using the limited number of the input-process samples, which can be both greater and smaller (the case of a short sample) than the number of the elements. The results of simulation of the adaptive signal processing are given, which show the high signal-processing efficiency in the adaptive antenna array.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9754-6
       
  • Self-Inversion of the Image of a Small-Scale Opaque Object in the Process
           of Focusing of the Illuminating Beam in an Absorbing Medium
    • Authors: E. L. Bubis; V. V. Lozhrkarev; A. N. Stepanov; A. I. Smirnov; V. O. Martynov; O. A. Mal’shakova; D. E. Silin; S. A. Gusev
      Abstract: We describe the process of adaptive self-inversion of an image (nonlinear switching) of smallscale opaque object, when the amplitude-modulated laser beam, which illuminates it, is focused in a weakly absorbing medium. It is shown that, despite the nonlocal character of the process, which is due to thermal nonlinearity, the brightness-inverse image is characterized by acceptable quality and a high conversion coefficient. It is shown that the coefficient of conversion of the original image to the inverse one depends on the ratio of the object dimensions and the size of the illuminating beam, and decreases sharply for relatively large objects. The obtained experimental data agree with the numerical calculations. Inversion of the images of several model objects and microdefects in a nonlinear KDP crystal is demonstrated.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9752-8
       
  • High-Resolution Terahertz Spectrometer Based on Quantum Cascade Lasers
    • Authors: V. L. Vaks; E. G. Domracheva; Yu. P. Korneeva; L. S. Revin; I. V. Tret’yakov; V. A. Anfert’ev; M. B. Chernyaeva
      Abstract: We consider the possibility of realizing a terahertz spectrometer using the radiation sources based on quantum cascade lasers and the receiving system based on hot-electron bolometers. Precision measurements of the amplitude and phase noise of the quantum cascade lasers in this frequency range are performed. The systems for stabilizing the frequency of the quantum cascade laser are described. The diagrams of the high-resolution terahertz spectrometers are presented.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9751-9
       
  • Response of the Lower Ionosphere to the Partial Solar Eclipses of August
           1, 2008 and March 20, 2015 Based on Observations of Radio-Wave Scattering
           by the Ionospheric Plasma Irregularities
    • Authors: N. V. Bakhmet’eva; V. N. Bubukina; V. D. Vyakhirev; E. E. Kalinina; G. P. Komrakov
      Abstract: The results of observations of the ionospheric effects of the partial solar eclipses on August 1, 2008 and March 20, 2015 are presented. The observations were performed by the partial-reflection technique during scattering of radio waves by natural irregularities in the D region and the method of resonant scattering of radio waves by artificial periodic irregularities of the ionospheric plasma. A three- to fivefold reduction of the electron density in the D region was obtained by the partialreflection technique. Ionospheric response at altitudes above 88 km is delayed by 20–25 min relative to the time of the maximum eclipse phase, while in the bottom D region the time delay is a few minutes. Variations in the characteristics of the signals scattered by artificial periodic irregularities, as well as velocities of the vertical motion of the plasma in the lower ionosphere during the solar eclipse were studied. An increase in the scattered-signal amplitude during an eclipse in the E region by 30–40 dB was recorded, stratification of the D region was observed, and the appearance of signals scattered at the mesopause altitudes was detected.
      PubDate: 2017-04-25
      DOI: 10.1007/s11141-017-9747-5
       
  • Improving the Efficiency of Quasi-Optical Bragg Reflectors
    • Authors: M. A. Khozin; G. G. Denisov; V. I. Belousov
      Abstract: In the analysis of propagation of wave beams in quasi-optical transmission lines, the loss rate and transformation of modes by various elements of the transmission line are of great importance. The effects occurring when a spatially bounded, obliquely incident wave beam is reflected from a Bragg resonator being a periodic, plane-layered medium with varied dielectric permittivity are considered. Such a reflector can be used as a frequency-selective element of the transmission line. Since the reflection coefficient of a plane wave from the Bragg reflector depends on its incidence angle, there occurs a transformation of the reflected beam. Analytical expressions for the beam displacement, the angle of deflection of the beam from the mirror reflection direction, and the wavefront curvature variation have been obtained. The influence of the mentioned effects on characteristics of the reflected wave beam in the main band of the Bragg reflector is numerically analyzed. The possibility of compensation for these distortions is considered.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9733-y
       
  • Novosibirsk Free Electron Laser: Recent Achievements and Future Prospects
    • Authors: O. A. Shevchenko; V. S. Arbuzov; N. A. Vinokurov; P. D. Vobly; V. N. Volkov; Ya. V Getmanov; I. V. Davidyuk; O. I. Deychuly; E. N. Dementyev; B. A. Dovzhenko; B. A. Knyazev; E. I. Kolobanov; A. A. Kondakov; V. R. Kozak; E. V. Kozyrev; V. V. Kubarev; G. N. Kulipanov; E. A. Kuper; I. V. Kuptsov; G. Ya. Kurkin; S. A. Krutikhin; L. E. Medvedev; S. V. Motygin; V. K. Ovchar; V. N. Osipov; V. M. Petrov; A. M. Pilan; V. M. Popik; V. V. Repkov; T. V. Salikova; I. K. Sedlyarov; S. S. Serednyakov; A. N. Skrinsky; S. V. Tararyshkin; A. G. Tribendis; V. G. Cheskidov; K. N. Chernov; M. A. Shcheglov
      Abstract: Free electron lasers (FELs) are unique sources of electromagnetic radiation with tunable wavelength. A high-power FEL has been created at the G. I.Budker Institute for Nuclear Physics. Its radiation frequency can be tuned over a wide range in the terahertz and infrared spectral ranges. As the source of electron bunches, this FEL uses a multi-turn energy-recovery linac, which has five straight sections. Three sections are used for three FELs which operate in different wavelength ranges (90–240 μm for the first, 37–80 μm for the second, and 5–20 μm for the third ones). The first and the second FELs were commissioned in 2003 and 2009, respectively. They are used for various applied and research problems now. The third FEL is installed on the last, forth accelerator loop, in which the electron energy is the maximum. It comprises three undulator sections and a 40 m optical cavity. The first lasing of this FEL was obtained in the summer of 2015. The radiation wavelength was 9 μm and the average power was about 100 W. The design power is 1 kW at a pulse repetition rate of 3.75 MHz. Radiation of the third FEL will be delivered to user stations from the protected hall in the near future. The third FEL commissioning results are presented and the current status of the first and second FELs as well as their future development prospects are described.
      PubDate: 2017-02-28
      DOI: 10.1007/s11141-017-9727-9
       
 
 
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