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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: 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: 13)
Advances in Power Electronics     Open Access   (Followers: 25)
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 218)
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: 16)
Consumer Electronics Times     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 210)
Edu Elektrika Journal     Open Access  
Electronic Design     Partially Free   (Followers: 79)
Electronic Markets     Hybrid Journal   (Followers: 8)
Electronic Materials Letters     Hybrid Journal   (Followers: 2)
Electronics     Open Access   (Followers: 60)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Electronics For You     Partially Free   (Followers: 64)
Electronics Letters     Hybrid Journal   (Followers: 25)
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: 147)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 75)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 64)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 32)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 50)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 55)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 51)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 17)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 34)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 15)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 27)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 56)
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: 15)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 7)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 30)
IET Power Electronics     Hybrid Journal   (Followers: 30)
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)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access  
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 40)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 10)
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: 18)
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 Computer & Electronics Research     Full-text available via subscription   (Followers: 2)
International Journal of Control     Hybrid Journal   (Followers: 13)
International Journal of Electronics     Hybrid Journal   (Followers: 5)
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: 6)
International Journal on Communication     Full-text available via subscription   (Followers: 13)
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: 9)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 18)
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   (Followers: 1)
Journal of Field Robotics     Hybrid Journal   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Full-text available via subscription   (Followers: 137)
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: 4)
Journal of Sensors     Open Access   (Followers: 22)
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: 2)
Metrology and Measurement Systems     Open Access   (Followers: 4)
Microelectronics and Solid State Electronics     Open Access   (Followers: 15)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 31)
Nanotechnology, Science and Applications     Open Access   (Followers: 5)
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Journal of Antennas and Propagation     Open Access   (Followers: 8)
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: 50)
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: 67)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 12)
Solid-State Electronics     Hybrid Journal   (Followers: 8)
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  [2353 journals]
  • Features of HF Radio Wave Attenuation in the Midlatitude Ionosphere Near
           the Skip Zone Boundary
    • Authors: P. F. Denisenko; A. I. Skazik
      Pages: 1 - 11
      Abstract: We briefly describe the history of studying the decameter radio wave attenuation by different methods in the midlatitude ionosphere. A new method of estimating the attenuation of HF radio waves in the ionospheric F region near the skip zone boundary is presented. This method is based on an analysis of the time structure of the interference field generated by highly stable monochromatic X-mode radio waves at the observation point. The main parameter is the effective electron collision frequency νeff, which allows for all energy losses in the form of equivalent heat loss. The frequency νeff is estimated by matching the assumed (model) and the experimentally observed structures. Model calculations are performed using the geometrical-optics approximation. The spatial attenuation caused by the influence of the medium-scale traveling ionospheric disturbances is taken into account. Spherical shape of the ionosphere and the Earth’s magnetic field are roughly allowed for. The results of recording of the level of signals from the RWM (Moscow) station at a frequency of 9.996 MHz at point Rostov are used.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9771-5
      Issue No: Vol. 60, No. 1 (2017)
       
  • A Possibility of Determining the Optical Peoperties of Water from the
           Snell-Window Image
    • Authors: L. S. Dolin; A. A. Molkov
      Pages: 12 - 23
      Abstract: We develop an analytical model of the Snell window, which allows for the effects of absorption and multiple scattering of light in water. The effect of an abnormally weak dependence of the visual brightness of the Snell-window boundary on the water turbidity is revealed. This effect, along with the effect of the Snell-window boundary “blurring” because of the light scattering in water can be used to determine the absorption and scattering coefficients of water using the corresponding processing of the Snell window images. We propose and experimentally check the algorithms for determining the inherent hydrooptical characteristics from the Snell-window images using the empirical correlations between various characteristics.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9772-4
      Issue No: Vol. 60, No. 1 (2017)
       
  • Solution of the Electron Motion Equations in a Relativistic Planar
           Magnetron
    • Authors: I. I. Vintizenko
      Pages: 24 - 28
      Abstract: We have ascertained the influence of relativism on the processes and output parameters of a relativistic magnetron. The solution of the electron motion equations in a relativistic plane-geometry magnetron is presented. It is shown that these equations have the form corresponding to the nonrelativistic case, where one uses normalization for the static and high-frequency fields.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9773-3
      Issue No: Vol. 60, No. 1 (2017)
       
  • Study of an End-Fed Dipole Antenna Excited by a Rectangular Waveguide
    • Authors: D. A. Bukhtiyarov; A.P. Gorbachev
      Pages: 29 - 36
      Abstract: We present the results of analysis of a dipole antenna fed via a rectangular waveguide and based on a recently proposed end-fed dipole. Both the radiation resistance and the complex input impedance of such an antenna are determined using the mirror image theory and the induced EMF method. The principles used for an optimal choice of the radius of the antenna conductors and the size of the wide wall of the waveguide are discussed. The experimental results indicate that the proposed approach is correct.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9774-2
      Issue No: Vol. 60, No. 1 (2017)
       
  • Application of the Two-Particle Correlation Function Approach to the
           Description of a Single-Pass Free Electron Laser Operated in SASE Mode
    • Authors: O. A. Shevchenko; N. A. Vinokurov
      Pages: 37 - 53
      Abstract: We describe the theory of a superluminescent single-pass free electron laser based on the Bogolyubov chain of equations for multiparticle distribution functions. Special choice of the variables eliminates the retardation of interaction. A small parameter (inverse number of particles per signal growth length in the accompanying reference system) for the chain truncation is found. Expansion over this parameter makes it possible to neglect three-particle correlation functions and solve only the equations containing a single-particle distribution function and two-particle correlation functions. The calculation results are in good agreement with the conclusions based on the previously developed quasilinear theory.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9775-1
      Issue No: Vol. 60, No. 1 (2017)
       
  • Processing of Antenna-Array Signals on the Basis of the Interference Model
           Including a Rank-Deficient Correlation Matrix
    • Authors: A. A. Rodionov; V. I. Turchin
      Pages: 54 - 64
      Abstract: We propose a new method of signal processing in antenna arrays, which is called the Maximum-Likelihood Signal Classification. The proposed method is based on the model in which interference includes a component with a rank-deficient correlation matrix. Using numerical simulation, we show that the proposed method allows one to ensure variance of the estimated arrival angle of the plane wave, which is close to the Cramer–Rao lower boundary and more efficient than the best-known MUSIC method. It is also shown that the proposed technique can be efficiently used for estimating the time dependence of the useful signal.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9776-0
      Issue No: Vol. 60, No. 1 (2017)
       
  • Estimation of the Moments of Appearance and Disappearance of a Radio
           Signal with Unknown Amplitude and Initial Phase
    • Authors: A. P. Trifonov; Yu. E. Korchagin; S. V. Korol’kov
      Pages: 65 - 80
      Abstract: We synthesize the quasilikelihood, maximum-likelihood, and quasioptimal algorithms for estimating the moments of appearance and disappearance of a radio signal with an arbitrary shape of the envelope function and unknown amplitude and initial phase. Asymptotic characteristics of the operation efficiency of the synthesized algorithm are found.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9777-z
      Issue No: Vol. 60, No. 1 (2017)
       
  • Study of the Stationarity of Random Time Series Using the Principle of the
           Information-Divergence Minimum
    • Authors: V.V. Savchenko
      Pages: 81 - 87
      Abstract: Using the theoretic-information approach and the criterion of the information-divergence minimum in the Kullback–Leibler metric, we propose a new algorithm for checking the time series for stationarity in a broad sense. We consider an example of realizing this algorithm, study its dynamic characteristics, and give recommendations on its use under conditions of small samples.
      PubDate: 2017-06-01
      DOI: 10.1007/s11141-017-9778-y
      Issue No: Vol. 60, No. 1 (2017)
       
  • Effect of the Ionospheric Parameter Variations at Altitudes of 80–350 km
           on Diurnal Dynamics of the ULF Magnetic Field Spectra at Midlatitudes
    • Authors: E. N. Ermakova; D. S. Kotik; A. V. Pershin; V. A. Pilipenko; K. Shiokawa
      Pages: 947 - 961
      Abstract: We study the causes of sporadic and long-term variations in the polarization spectrum of the ultralow-frequency (ULF) magnetic background noise at midlatitudes. Data records of low-frequency horizontal magnetic components at the Novaya Zhizn midlatitude observatory of the Radiophysical Research Institute (56°N, 45.74°E) and the Japanese station Moshiri (44.37°N, 142.27°E) were used. Ionosonde data from the sites located in Russia (Vasilsursk station) and in Japan (Wakkanai station) were also analyzed. The effect of the sporadic Es layers on the frequency spectrum of noise polarization was detected. It is shown that the appearance of quite intense sporadic Es layers with the cutoff frequencies f0Es > 3–5 MHz can significantly alter the polarization spectrum parameters, which is due to variations in the optical depth and Q factor of the sub-ionospheric Alfvén resonator (sub-IAR) formed by the valley between the E and F regions. Numerical simulation of the polarization parameters of the background noise using the IRI-2012 model corrected by the ionosonde data confirmed that the Es layer about 5 km thick, with the cutoff frequencies f0Es > 3–5 MHz, may lead to a sharp decrease in the boundary frequency fb between the frequency ranges of the left- and right-hand polarized noise, or even to a complete disappearance of the sub-IAR manifestation in the polarization parameter spectrum. Numerical calculations have also revealed the impact of the altitude position of the Es layer on the Q factor of the sub-IAR. The effect of variations in the altitude and cutoff frequency of the F-layer maximum, as well as the electron density at the altitudes of the E layer and the valley, on the features of the diurnal dynamics of the ULF noise polarization spectra is discussed.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9764-4
      Issue No: Vol. 59, No. 12 (2017)
       
  • Self-Consistent Model of a Night Sprite
    • Authors: A. A. Evtushenko; F. A. Kuterin
      Pages: 962 - 971
      Abstract: We propose a radially symmetric self-consistent model of a sprite at altitudes of 60 to 90 km in the region with a radius of 60 km. The perturbations of the densities of ions, electrons, and neutral particles, as well as the photon-emission intensities at the mesospheric altitudes are analyzed with respect to the sprite under night-time conditions. Because of the fast electric-field displacement in the upper part of the diffuse region of the sprite at altitudes of 78 to 81 km, radiation at the discharge axis stops earlier than that in the outer region, i.e., the toroidal structures of the electric field and the sprite radiation are observed. At altitudes of 83 to 87 km, the electrondensity decrease related to the increasing role of the dissociative attachment to molecular oxygen occurs, which significantly decreases conductivity at these altitudes.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9765-3
      Issue No: Vol. 59, No. 12 (2017)
       
  • On Features of the Generation of Artificial Ionospheric Irregularities
           with Transverse Scales of 50–200 m
    • Authors: I. A. Bolotin; V. L. Frolov; A. D. Akchurin; E.Yu. Zykov
      Pages: 972 - 981
      Abstract: We consider the features of generation of artificial ionospheric irregularities with transverse (to the geomagnetic field) scales l⊥ ≈ 50–200 m in the ionosphere modified by high-power HF radio waves. It was found that there are at least two mechanisms for generation of these irregularities in the ionospheric F region. The first mechanism is related to the resonant interaction between radio waves and the ionospheric plasma, while the second one takes place even in the absence of the resonant interaction. Different polarization of the high-power radiation was used to separate the mechanisms in the measurements.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9766-2
      Issue No: Vol. 59, No. 12 (2017)
       
  • The Theory of Laser Bathymetry Using the Effect of Multiple Reflection of
           a Light Pulse from the Seafloor
    • Authors: V. L. Weber; L. S. Dolin
      Pages: 982 - 990
      Abstract: This work deals with the problem of using lidar for measuring the extremely small depths at which the difference between the times of arrival of the echo signals from the sea surface and the seafloor becomes smaller than the sounding-pulse duration. To solve this problem, we propose to use the effect of multiple reflection of light from the seafloor, which leads to the appearance of additional echo signals with delay times exceeding the time of the double light-pulse transmission through the water layer. It is shown that the doubly reflected signal can actually be used for decreasing the minimum measured sea depth by a factor of about 2.5 with unchanged sounding-pulse duration.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9767-1
      Issue No: Vol. 59, No. 12 (2017)
       
  • Dynamics of a Self-Consistent Magnetic Field and Diffusive Scattering of
           Ions in a Plasma with Strong Thermal Anisotropy
    • Authors: L.V. Borodachev; M.A. Garasev; D. O. Kolomiets; V. V. Kocharovsky; V.Yu. Martyanov; A.A. Nechaev
      Pages: 991 - 999
      Abstract: We numerically simulate the nonlinear phase of the Weibel instability of a two-component plasma with strong thermal anisotropy and comparable energies of the electron and ion fractions. Spatiotemporal dynamics of the current filaments and the magnetic field created by the electrons or ions is analyzed. It is found that the magnetic field resulting from the electron instability leads to the scattering of ions, decreasing the degree of their momentum distribution anisotropy and suppressing the development of the ion instability. It is shown that the long-term maintenance and evolution of a large-scale quasi-stationary magnetic field are due to the ion currents which are induced by the decaying magnetic field and start to dominate the electrons with time. The possibility of the considered scenario of the Weibel instability in a nonequilibrium laser-produced plasma is discussed.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9768-0
      Issue No: Vol. 59, No. 12 (2017)
       
  • Theory of a Circular Loop Antenna Located on the Surface of a Dielectric
           Column in a Magnetoplasma
    • Authors: T. M. Zaboronkova; A. S. Zaitseva; A. V. Kudrin; O. S. Mukhina
      Pages: 1000 - 1016
      Abstract: We study the electrodynamic characteristics of a circular loop antenna located on the surface of a dielectric column in a homogeneous magnetoplasma. The antenna has the form of an infinitesimally thin, perfectly conducting narrow strip coiled into a ring and is excited by a monochromatic given voltage. Singular integral equations for azimuthal harmonics of the antenna current are obtained in the case where the dielectric column is aligned with an external magnetic field. Based on the solution of these equations, the current distribution and input impedance of the antenna are found and analyzed. It is shown that in the resonant frequency ranges of a magnetoplasma, these characteristics admit a simplified analytical description, which corresponds to the transmission line theory with a complex current-distribution constant.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9769-z
      Issue No: Vol. 59, No. 12 (2017)
       
  • Application of Modified Bragg Structures in High-Power Submillimeter
           Cyclotron Autoresonance Masers
    • Authors: N. S. Ginzburg; V. Yu. Zaslavsky; A. M. Malkin; N. Yu. Peskov; A. S. Sergeev
      Pages: 1017 - 1025
      Abstract: We perform theoretical analysis and numerical simulation of cyclotron autoresonance masers, in which we propose using electrodynamic systems in the form of hybrid two-mirror cavities based on modified and conventional Bragg reflectors. It is shown that a stable regime of narrow-band generation with a multimegawatt power level can be achieved at a frequency of about 300 GHz in the described scheme of a generator based on a near-axis, moderately relativistic electron beam with an accelerating voltage of 500 kV and a current of 10 A, where the transverse size (diameter) of the interaction space is about 5 wavelengths and the guiding magnetic field is about 5 T.
      PubDate: 2017-05-01
      DOI: 10.1007/s11141-017-9770-6
      Issue No: Vol. 59, No. 12 (2017)
       
  • 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
       
 
 
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