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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: 4)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 6)
Advances in Microelectronic Engineering     Open Access   (Followers: 9)
Advances in Power Electronics     Open Access   (Followers: 17)
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 231)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 19)
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: 25)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 29)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 9)
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: 38)
China Communications     Full-text available via subscription   (Followers: 7)
Circuits and Systems     Open Access   (Followers: 12)
Consumer Electronics Times     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 84)
Edu Elektrika Journal     Open Access  
Electronic Design     Partially Free   (Followers: 68)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 1)
Electronics     Open Access   (Followers: 50)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Electronics For You     Partially Free   (Followers: 53)
Electronics Letters     Hybrid Journal   (Followers: 23)
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 38)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 2)
Energy Storage Materials     Full-text available via subscription  
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: 150)
Giroskopiya i Navigatsiya     Open Access  
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 44)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 36)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 26)
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: 41)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 36)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 45)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 13)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 27)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 11)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 18)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 47)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 5)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 13)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 7)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 12)
IET Power Electronics     Hybrid Journal   (Followers: 23)
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 15)
IETE Journal of Education     Open Access   (Followers: 3)
IETE Journal of Research     Open Access   (Followers: 8)
IETE Technical Review     Open Access   (Followers: 7)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 6)
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: 5)
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: 14)
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: 10)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal  
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 7)
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: 2)
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: 4)
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: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 6)
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: 13)
Journal of Electrical Bioimpedance     Full-text available via subscription   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 6)
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 5)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 4)
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: 109)
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: 7)
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: 18)
Journal of Signal and Information Processing     Open Access   (Followers: 8)
Jurnal Rekayasa Elektrika     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 13)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 6)
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: 31)
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: 12)
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: 3)
Security and Communication Networks     Hybrid Journal   (Followers: 3)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 43)
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: 4)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 52)
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  [2336 journals]
  • Coronal Loops Heating in the Atmosphere of the Ad Leo Red Dwarf
    • Authors: V. V. Zaitsev; P. V. Kronshtadtov
      Pages: 169 - 176
      Abstract: We study the possible origin of long-lasting soft X-ray flares on the AD Leo star, which were observed onboard the Extreme Ultraviolet Explorer (EUVE) spacecraft for the period of 1993-2000 [1]. These flares have relatively long rise and decay times of the radiation intensity (τ R ≈ 104 s and τ d ≈ 5 · 103, respectively), as well as a relatively large emission measure EM ≈ 1051cm−3, which exceeds by 1–3 orders of magnitude the emission measure of soft X-ray flares on the Sun. Assuming that the radiation appears in magnetic loops and basing on the observed values of the emission measure and radiation decay time, the authors of [1] determined the typical length \( \overline{l}\approx 1.5\cdot {10}^{10} cm \) , electron number density \( \overline{n}\approx 3\cdot {10}^{11}c{m}^{-3} \) , and plasma temperature \( \overline{T}\approx 2.5\cdot 107 \) K of the loops. This paper considers plasma heating due to dissipation of the electric currents in the coronal magnetic loops of the star induced by the photospheric convection. The large inductance of the loop as an equivalent electric circuit determines the long time of the current rise in the source and explains the observed time of plasma heating and the rise time of the X-ray radiation intensity. It is shown that the parameters of the X-ray sources in the AD Leo atmosphere agree with the parameters calculated under the assumption of simultaneous emission of a great number of loops (about 50) with electric currents greater than 1013 A, which exceeds the electric currents in the solar coronal magnetic loops by 1–3 orders of magnitude. Such an exceeding can be related to the higher photospheric convection velocities on the late-type stars compared with the Sun.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9687-5
      Issue No: Vol. 59, No. 3 (2016)
  • Features of the Electromagnetic and Plasma Disturbances Induced at the
           Altitudes of the Earth’s Outer Ionosphere by Modification of the
           Ionospheric F 2 Region Using High-Power Radio Waves Radiated by the SURA
           Heating Facility
    • Authors: V. L. Frolov; V. O. Rapoport; E. A. Schorokhova; A. S. Belov; M. Parrot; J.-L. Rauch
      Pages: 177 - 198
      Abstract: In this paper we systematize the results of studying the characteristics of the plasma-density ducts, which was conducted in 2005–2010 during the DEMETER-satellite operation. The ducts are formed at altitudes of about 700 km as a result of the ionospheric F 2 region modification by high-power high-frequency radio waves radiated by the midlatitude SURA heating facility. All the performed measurements are used as the basis for determining the formation conditions for such ducts, the duct characteristics are studied, and the opportunities for the duct influence on the ionosphere–magnetosphere coupling and propagation of radio waves of various frequency ranges are demonstrated. The results of numerical simulation of the formation of such ducts are presented.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9688-4
      Issue No: Vol. 59, No. 3 (2016)
  • On Parameterization of the Global Electric Circuit Generators
    • Authors: N. N. Slyunyaev; A. A. Zhidkov
      Pages: 199 - 216
      Abstract: We consider the problem of generator parameterization in the global electric circuit (GEC) models. The relationship between the charge density and external current density distributions inside a thundercloud is studied using a one-dimensional description and a three-dimensional GEC model. It is shown that drastic conductivity variations in the vicinity of the cloud boundaries have a significant impact on the structure of the charge distribution inside the cloud. Certain restrictions on the charge density distribution in a realistic thunderstorm are found. The possibility to allow for conductivity inhomogeneities in the thunderstorm regions by introducing an effective external current density is demonstrated. Replacement of realistic thunderstorms with equivalent current dipoles in the GEC models is substantiated, an equation for the equivalent current is obtained, and the applicability range of this equation is analyzed. Relationships between the main GEC characteristics under variable parameterization of GEC generators are discussed.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9689-3
      Issue No: Vol. 59, No. 3 (2016)
  • Retrieval of Sea-Bed Parameters by the Method of Matching Acoustic Fields
           on the Basis of Vertical Angular Spectra
    • Authors: B. V. Kerzhakov; V. V. Kulinich
      Pages: 217 - 224
      Abstract: We use the field matching method to solve the inverse problem of estimating the geoacoustic parameters of a stratified sea bed using the objective function based on the norm of difference between the experimental and simulated vertical angular spectra of the acoustic field and combination of the rapid-annealing method with direct search methods for localization of the global minimum of the objective function. To reduce the influence of the ravine effects of the objective function, we use regularization on the basis of mutual correlations of the experimental and simulated vertical angular spectra of the acoustic field. The numerical experiment has been performed to retrieve the parameters of the model waveguide, e.g., the thickness of the water layer and the layer of sediments, the velocity and attenuation coefficients of longitudinal waves, and the density of the sediment layer and the subjacent half-space in the presence of noise interference of different intensity levels.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9690-x
      Issue No: Vol. 59, No. 3 (2016)
  • Scattering of the Transverse Waveguide Modes of Surface Acoustic Waves by
           the Finite-Aperture Electrode Structures
    • Authors: B. V. Sveshnikov; A. S. Bagdasaryan
      Pages: 225 - 233
      Abstract: We develop a physical model allowing one to analyze reflection of the inhomogeneous beams of surface acoustic waves from metal strips in a planar waveguide on the piezoelectric substrate. Analytical relationships for determining the coefficients of scattering and mutual conversion of the transverse waveguide modes during their interaction with the spatially limited Bragg reflectors are obtained. The waveguide-reflector characteristics are shown to depend on the ratio of the waveguide aperture to its maximum value for which only the fundamental transverse mode is excited. It is established that the developed model strictly corresponds to the energy conservation law, i.e., in the absence of dissipation, the power of the inhomogeneous beam, which is incident on the finite reflector, is equal to the total power of all the scattered fields of the discrete and continuous waveguide spectra.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9691-9
      Issue No: Vol. 59, No. 3 (2016)
  • Exact Analytical Solutions of the Problem of Electromagnetic-Wave
           Reflection from Dielectric Layers with New Types of Inhomogeneities
    • Authors: N. A. Denisova
      Pages: 234 - 245
      Abstract: We describe a method for finding new classes of monotonic and nonmonotonic profiles of the refractive index in inhomogeneous layers, which allow one to obtain exact analytical solutions of the direct problem of electromagnetic-field reflection. The possibility of using inhomogeneous layers for optical antireflection coating is discussed.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9692-8
      Issue No: Vol. 59, No. 3 (2016)
  • The Wave Processes in Micro-Inhomogeneous Media with Different-Modulus
           Nonlinearity and Relaxation
    • Authors: V. E. Nazarov; S. B. Kiyashko; A. V. Radostin
      Pages: 246 - 256
      Abstract: We present the results of analytical and numerical studies of propagation of longitudinal acoustic waves in micro-inhomogeneous media with different-modulus nonlinearity and relaxation. The solutions for evolution of the profiles and spectral characteristics of the initially harmonic waves are obtained.
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9693-7
      Issue No: Vol. 59, No. 3 (2016)
  • Erratum to: The Main Principles of Formation of the Transverse Modes in
           the Multilayered Waveguides of Surface Acoustic Waves
    • Authors: B. V. Sveshnikov; A. S. Bagdasaryan
      Pages: 257 - 257
      PubDate: 2016-08-01
      DOI: 10.1007/s11141-016-9694-6
      Issue No: Vol. 59, No. 3 (2016)
  • Multilayer Radar Absorbing Non-Woven Material
    • Authors: A. V. Dedov; V. G. Nazarov
      Pages: 43 - 47
      Abstract: We study the electrical properties of multilayer radar absorbing materials obtained by adding nonwoven sheets of dielectric fibers with an intermediate layer of electrically conductive carbon fibers. Multilayer materials that absorb electromagnetic radiation in a wide frequency range are obtained by varying the content of the carbon fibers. The carbon-fiber content dependent mechanism of absorption of electromagnetic radiation by sheets and multilayer materials is considered.
      PubDate: 2016-07-20
      DOI: 10.1007/s11141-016-9674-x
      Issue No: Vol. 59, No. 1 (2016)
  • The Dynamics of Small-Sized Ensembles of the Phase-Locked Loops with
           Unidirectional Couplings
    • Authors: K. N. Aleshin; V. V.Matrosov; V. D. Shalfeev
      Pages: 48 - 58
      Abstract: We study collective dynamics of a small-sized chain of the unidirectionally coupled phase-locked loop. The conditions for the synchronous-regime existence are found, the asynchronous selfoscillation regimes and the transitions among them are studied, and the property of inheriting the structure of the parameter space of the chain when a new element is added to it is established.
      PubDate: 2016-07-25
      DOI: 10.1007/s11141-016-9675-9
      Issue No: Vol. 59, No. 1 (2016)
  • Localization of a Coherent Acoustic Source in a Shallow-Water Channel
           Using the Partially Calibrated Adaptive Antenna Array
    • Authors: A. G. Sazontov; I. P. Smirnov; A. S. Chashchin
      Abstract: We consider the problem of determining the location of a coherent acoustic source in a shallowwater channel using a partially calibrated antenna array. To solve this problem, we develop a reduced-rank stable projection algorithm, which is the generalization of the RARE method to the case of signal reception under the conditions of incomplete information on the propagation medium. The results of experimental validation of the proposed approach, which show its efficiency under the conditions of an actual shallow-water area, are presented.
      PubDate: 2016-08-11
      DOI: 10.1007/s11141-016-9678-6
  • Quasioptical Mach—Zehnder Interferometer with a Reflective Diffraction
           Grating Acting as a Power Splitter
    • Authors: S. N. Vlasov; S. V. Katin; E. V. Koposova; L. V. Lubyako; L. I. Prokofyev
      Abstract: Abstract We present a prototype of a quasioptical Mach—Zehnder interferometer with wave beam splitters in the form of reflective diffraction gratings. Characteristics of the diplexer are studied experimentally at frequencies of about 140 GHz. The measurement results are close to the calculated ones.
      PubDate: 2016-08-11
      DOI: 10.1007/s11141-016-9683-9
  • The Electron-Optical System of a Gyrotron with an Operating Frequency of
           263 GHz for Spectroscopic Research
    • Authors: A. N. Kuftin; V. N. Manuilov
      Abstract: We describe specific features of modeling numerically the operation of magnetron-injection guns, which form high-quality helical electron beams in gyrotrons operated in the short-wave part of the millimeter-wave band (at a wavelength of 1 mm). As an example, we consider the gun of a gyrotron having an operating frequency of 263 GHz designed for spectroscopic research. It is shown that there are good reasons to perform calculations and optimization of the magnetroninjection un in two steps. At the first step, a simplest two-dimensional model can be used, which allows only for the influence of the field of the electrodes and the intrinsic space charge of the beam on the beam parameters. At the second, final stage one should allow for such factors as roughness of the emitting surface and thermal velocities of electrons. The electron distribution function in oscillatory velocities and the coefficient of electron reflection from the magnetic mirror should be calculated. It is demonstrated that the magnetron-injection gun, which is optimized by the method presented, is sufficiently universal and can be operated both at the first and second cyclotron-frequency harmonics. This opens up the possibility of developing gyrotrons for spectroscopy applications at frequencies of 263 and 526 GHz, respectively, which are required for biological and medical research.
      PubDate: 2016-08-11
      DOI: 10.1007/s11141-016-9682-x
  • On Dispersive Properties of the Photon-Density Waves in an Anisotropic
           Scattering Medium
    • Authors: A. G. Luchinin; L. S. Dolin
      Abstract: We study frequency dependences of the phase and group velocities of the photon-density waves in an anisotropic scattering turbid medium of the sea water type. It is shown that such a medium has an anomalous dispersion in relation to these waves, and their phase and group velocities are functions of the distance to a radiation source. The possibility of time focusing of the photondensity waves is considered for a linear frequency modulation of the radiated pulse. It is shown that full compression of the modulated signal is not achievable due to the frequency dependence of the refractive index of the photon-density wave. The degree of compression of the chirp signals with different parameters has been estimated.
      PubDate: 2016-08-11
      DOI: 10.1007/s11141-016-9684-8
  • Multiplexing Effect Due to Exposure of the Working Substance of a Spin
           Echo Processor to Magnetic Field Pulses
    • Authors: I. V. Pleshakov; P. S. Popov; Yu. I. Kuzmin; V. I. Dudkin
      Abstract: We consider a spin echo processor that uses a magnetically ordered material (ferrite) as a working substance. It is shown that it is possible to achieve suppression of the crosstalk (spurious signals) excited by radio-frequency pulses from different chains arriving at the system if the working substance is affected by sufficiently long magnetic field pulses. Thus, time-division multiplexing of the information processes can be carried out.
      PubDate: 2016-08-10
      DOI: 10.1007/s11141-016-9686-6
  • The Wave Processes in the Media Having Inelastic Hysteresis with
           Saturation of The Nonlinear Loss
    • Authors: V. E. Nazarov; S. B. Kiyashko
      Abstract: We study theoretically the nonlinear wave processes during excitation of a longitudinal harmonic wave in an unbounded medium and the rod resonator with inelastic hysteresis and saturation of the amplitude-dependent loss. The nonlinear-wave characteristics in such systems, namely, the amplitude-dependent loss, variation in the wave-propagation velocity, the resonant-frequency shift, and the higher-harmonic amplitudes are determined. The results of the theoretical and experimental studies of nonlinear effects in the rod resonator of annealed polycrystalline copper are compared. The effective parameters of the hysteretic nonlinearity of this metal are evaluated.
      PubDate: 2016-08-10
      DOI: 10.1007/s11141-016-9680-z
  • Spatial Structure of Large-Scale Plasma Density Perturbations HF-Induced
           in the Ionospheric F 2 Region
    • Authors: V. L. Frolov; G. P. Komrakov; Ya. V. Glukhov; E. S. Andreeva; V. E. Kunitsyn; G. A. Kurbatov
      Abstract: We consider the experimental results obtained by studying the large-scale structure of the HF-disturbed ionospheric region. The experiments were performed using the SURA heating facility. The disturbed ionospheric region was sounded by signals radiated by GPS navigation satellite beacons as well as by signals of low-orbit satellites (radio tomography). The results of the experiments show that large-scale plasma density perturbations induced at altitudes higher than the F2 layer maximum can contribute significantly to the measured variations of the total electron density and can, with a certain arrangement of the reception points, be measured by the GPS sounding method.
      PubDate: 2016-08-10
      DOI: 10.1007/s11141-016-9677-7
  • The Main Principles of Formation of the Transverse Modes in the
           Multilayered Waveguides of Surface Acoustic Waves
    • Authors: B. V. Sveshnikov; A. S.Bagdasaryan
      Abstract: We develop a self-consistent model allowing one to analyze the properties of the interdigital transducer of the surface acoustic waves as a symmetric five-layered waveguide on a piezoelectric substrate with three possible values of the phase velocity of the acoustic-wave propagation along the longitudinal axis of the system. The transcendental dispersion relation for describing the waves in such a system is derived and the method for its instructive graphic analysis is proposed. The condition under which only the fundamental transverse mode is excited in the waveguide is formulated. The method for calculating the normalized power and the transverse distribution of the field of the continuous-spectrum waves radiated from the considered waveguide is described. It is shown that the characteristic spatial scale of the longitudinal damping of the amplitude of this field at the waveguide center can be a qualitative estimate of the transverse-mode formation length. The efficiency of a new method for suppressing the higher-order transverse waveguide modes is demonstrated.
      PubDate: 2016-08-10
      DOI: 10.1007/s11141-016-9679-5
  • Influence of the Thickness of the Barrier Layer in Nanoheterostructures
           and the Gate-Drain Capacitance on the Microwave and Noise Parameters of
           Field-Effect AlGaN/GaN HEMT
    • Authors: S. V. Mikhaylovich; Yu.V. Fedorov
      Abstract: We perform a computational and analytical study of how the thickness of the barrier layer in nanoheterostructures and the gate-drain capacitance C gd influence the microwave parameters (limiting frequency of current amplification and maximum generation frequency) and noise parameters (noise factor) of a field-effect AlGaN/GaN high electron mobility transistor. The results of complex measurements of the parameters of such transistors based on nanoheterostructures with a barrier layer thickness of 3.5–15.7 nm, which were performed within the framework of four technological routes in the range 0.1–67 GHz, are presented. It is shown that in order to reduce the noise ratio and improve the microwave parameters, it is necessary to optimize both the parameters of nanoheterostructures and the manufacturing techniques. In particular, the thickness of the barrier layer should be reduced, and the gate length should be chosen such as to maximize the product of the squared maximum current amplification frequency in the interior of the transistor and the output impedance between the drain and the source. Additionally, attention should be given to the shape of the gate to reduce the capacitance C gd. Under certain conditions of manufacture of nitride field-effect HEMT, one can achieve a lower noise factor compared with the transistors based on arsenide nanoheterostructures.
      PubDate: 2016-08-10
      DOI: 10.1007/s11141-016-9685-7
  • Influence of Diffraction Effects on the Result of Measuring the Absorption
    • Authors: A. V. Shatsky
      Abstract: We consider the problem of the influence of diffraction effects on the result of measuring the absorption coefficient of ultrasound in weakly absorbing liquids by the pulse method. Diffraction attenuation of an ultrasonic signal in a measuring cell using solid-state delay lines is calculated. It is shown that the use of delay lines of the ultrasonic signal leads to a considerable distortion of the measured absorption coefficient in the low-frequency range from the true value and can either overestimate or underestimate the results.
      PubDate: 2016-08-09
      DOI: 10.1007/s11141-016-9681-y
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