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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: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 7)
Advances in Microelectronic Engineering     Open Access   (Followers: 10)
Advances in Power Electronics     Open Access   (Followers: 19)
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 192)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 22)
Annals of Telecommunications     Hybrid Journal   (Followers: 7)
Archives of Electrical Engineering     Open Access   (Followers: 11)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access  
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 39)
China Communications     Full-text available via subscription   (Followers: 7)
Circuits and Systems     Open Access   (Followers: 13)
Consumer Electronics Times     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 88)
Edu Elektrika Journal     Open Access  
Electronic Design     Partially Free   (Followers: 72)
Electronic Markets     Hybrid Journal   (Followers: 8)
Electronic Materials Letters     Hybrid Journal   (Followers: 1)
Electronics     Open Access   (Followers: 56)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Electronics For You     Partially Free   (Followers: 60)
Electronics Letters     Hybrid Journal   (Followers: 23)
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 40)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 3)
Energy Storage Materials     Full-text available via subscription   (Followers: 1)
EPJ Quantum Technology     Open Access  
EURASIP Journal on Embedded Systems     Open Access   (Followers: 13)
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: 128)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 52)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 41)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 28)
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: 45)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 41)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 46)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 15)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 31)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 13)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 22)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 50)
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: 13)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 7)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 14)
IET Power Electronics     Hybrid Journal   (Followers: 25)
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 16)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 8)
IETE Technical Review     Open Access   (Followers: 10)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Informatik-Spektrum     Hybrid Journal   (Followers: 1)
Instabilities in Silicon Devices     Full-text available via subscription  
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 15)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 7)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 18)
International Journal of Antennas and Propagation     Open Access   (Followers: 9)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 4)
International Journal of Computer & Electronics Research     Full-text available via subscription   (Followers: 1)
International Journal of Control     Hybrid Journal   (Followers: 13)
International Journal of Electronics     Hybrid Journal   (Followers: 3)
International Journal of Electronics & Data Communication     Open Access   (Followers: 10)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 12)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 1)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 9)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 6)
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Numerical Modelling:Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 3)
International Journal of Power Electronics     Hybrid Journal   (Followers: 12)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 7)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 5)
International Journal on Communication     Full-text available via subscription   (Followers: 13)
International Journal on Electrical and Power Engineering     Full-text available via subscription   (Followers: 7)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 4)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 8)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 2)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription  
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 15)
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 6)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 5)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 4)
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: 122)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 6)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 3)
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 9)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 2)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 30)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 7)
Journal of Semiconductors     Full-text available via subscription   (Followers: 3)
Journal of Sensors     Open Access   (Followers: 20)
Journal of Signal and Information Processing     Open Access   (Followers: 8)
Jurnal Rekayasa Elektrika     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 14)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Metrology and Measurement Systems     Open Access   (Followers: 4)
Microelectronics and Solid State Electronics     Open Access   (Followers: 14)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 33)
Nanotechnology, Science and Applications     Open Access   (Followers: 4)
Networks: an International Journal     Hybrid Journal   (Followers: 4)
Open Journal of Antennas and Propagation     Open Access   (Followers: 4)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 13)
Paladyn, Journal of Behavioral Robotics     Open Access  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Patents on Electrical & Electronic Engineering     Full-text available via subscription   (Followers: 7)
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: 57)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 10)
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: 1)
Technical Report Electronics and Computer Engineering     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 6)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 5)
Visión Electrónica : algo más que un estado sólido     Open Access  
Wireless and Mobile Technologies     Open Access   (Followers: 5)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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Journal Cover Radiophysics and Quantum Electronics
  [SJR: 0.336]   [H-I: 11]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-9120 - ISSN (Online) 0033-8443
   Published by Springer-Verlag Homepage  [2335 journals]
  • 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
       
  • The Features of the Frequency-Modulation Method When Studying the Shapes
           of the Spectral Lines of Nonlinear Absorption
    • Authors: G. Yu. Golubiatnikov; S. P. Belov; A. V. Lapinov
      Abstract: We briefly consider the method of the frequency (phase) modulation and signal detection at the second harmonic of the modulation frequency for recording and analyzing the spectral-line shapes. The precision sub-Doppler spectrometer in the millimeter- and submillimeter-wave ranges, which operated in the regime of nonlinear saturation of the spectral transitions in a standing wave (the Lamb-dip method), was used during the measurements. The influence of the saturation degree on the value and shape of the recorded frequency-modulated signals in the quadrature channels during the synchronous detection is demonstrated. Variation in the relationships among the signals determined by dispersion and absorption was observed. The necessity of allowance for the influence of the group-velocity dispersion and coherent effects on the shape of the recorded spectral lines is experimentally shown.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9740-z
       
  • On Studying the Possibility to Improve the Output Characteristics of
           W-Band Traveling-Wave Tubes
    • Authors: A. A. Ivanov
      Abstract: We have studied and calculated design variants of the slow-wave and electron-optical systems of a W-band traveling-wave tube. The manufactured experimental prototypes of such tubes were based on the slow-wave system of the “modified winding waveguide” type. Electric parameters of the prototypes were measured.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9731-0
       
  • Production of Nanopowders by the Evaporation–Condensation Method Using a
           Focused Microwave Radiation
    • Authors: A. V. Vodop’yanov; D. A. Mansfeld; A. V. Samokhin; N. V. Alekseev; Yu. V. Tsvetkov
      Abstract: The formation of the WO3, SnO2 and ZnO metal oxide nanoparticles from vapors generated during evaporation of the material by a focused beam of microwave electromagnetic radiation with a frequency of 24 GHz and an energy flux density of more than 10 kW/cm2 is studied experimentally. The specific surface area of the nanopowders obtained over the entire range of the process parameters ranged from 1.9 to 8.3 m2/g, which corresponds to an average particle size of 430 to 95 nm. The possibility to control the dispersion composition of the powders is demonstrated. Increasing the quenching air flow increases the specific surface area of the powder obtained. The maximum evaporation rate of WO3 exceeded 100 g/h.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9737-7
       
  • Sensitivity and Noise of Cold-Electron Bolometer Arrays
    • Authors: A. S. Mukhin; A. V. Gordeeva; L. S. Revin; A. E. Abashin; A. A. Shishov; A. L. Pankratov; S. Mahashabde; L. S. Kuzmin
      Abstract: We perform experimental and theoretical studies of the series-parallel arrays of the cold-electron bolometers integrated into a cross-slot antenna and composed with an immersion silicon lens. This work is aimed at determining the efficiency of radiation absorption by bolometers, their volt-watt sensitivity, and equivalent noise power. The absorbed power was found using two independent methods, which ensured a better reliability of the results. The first method is based on comparing the experimental current-voltage characteristics of bolometers with the model based on the heat-balance equation. The second approach involves simulation of the electromagnetic properties of the system including the antenna, the lens, the bandpass filters, and the radiation source. The discrepancy among the results obtained using various methods does not exceed 30%. Optimization of the experimental setup is proposed to reach the photon-noise detection regime.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9744-8
       
  • A Compact Neutron Source for Boron Neutron Capture Therapy
    • Authors: S. V. Golubev; I. V. Izotov; S. V. Razin; A. V. Sidorov; V. A. Skalyga
      Abstract: We propose a neutron generator scheme based on a high-current ion source with electron cyclotron resonance plasma heating by high-power millimeter-wave gyrotron radiation. The most promising application of this neutron generator is a medical one, namely, boron neutron capture therapy of oncological diseases. A possibility for using a multi-aperture extraction system for high-current ion beam generation to increase the total current is studied. It is shown that the parameters of the plasma flow leaving a magnetic trap permit the effective use of multi-aperture systems without a significant loss in the ion beam current density. Thus, the use of multi-aperture systems in the ion source of a neutron generator can significantly increase the total neutron yield.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9735-9
       
  • Development of a High-Power Wideband Amplifier on the Basis of a
           Free-Electron Maser Having an Operating Frequency Near 30 GHz: Modeling
           and Results of the Initial Experiments
    • Authors: I. V. Bandurkin; D. E. Donets; A. K. Kaminsky; S. V. Kuzikov; E. A. Perel’shteyn; N. Yu. Peskov; A. V. Savilov; S. N. Sedykh
      Abstract: We develop a high-power wideband amplifier based on a free-electron maser for particle acceleration, which will be operated in the 30 GHz frequency band, on the basis of the LIU-3000 linear induction accelerator forming an electron beam with an electron energy of 0.8 MeV, a current of 250 A, and a pulse duration of 200 ns. As the operating regime, we chose the regime of grazing of dispersion curves, since, according to the modeling performed, it allows one to ensure an instantaneous amplification band of about 5–7% in an undulator with regular winding for an output radiation power at a level of 20 MW and a gain of 30–35 dB. The results of the first experiments studying this FEM-based scheme are presented, in which the specified power level is achieved in the range around 30 GHz, and fast tuning of ±0.5 GHz in the band of variations in the frequency of the master magnetron is demonstrated. Modeling shows that the use of the non-resonance trapping/braking regime, which is realized in an undulator with profiled parameters, allows one to expect an increase in the radiation power of up to 35–40 MW with simultaneous widening of the amplification band up to 30% under the conditions of the LIU-3000 experiments.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9734-x
       
  • Microwave Cooled Microbolometers Based on Cermet Si–Cr Films
    • Authors: S. N. Vdovichev; V. F. Vdovin; A. Yu. Klimov; A. S. Mukhin; Yu. N. Nozdrin; V. V. Rogov; O. G. Udalov
      Abstract: We present the results of creating a cooled microbolometer based on the cermet films of the silicon and chromium mixture. This material is used for manufacturing the freely hanging high-resistive microbolometers for the first time. The details of fabricating such microbolometers and the prospects for using cermet films to construct microbolometers are discussed. The first estimates of sensitivity of the fabricated microbolometers are given.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9741-y
       
  • Pulse-Periodic Regimes of Kinetic Instabilities in the Non-Equilibrium
           Plasma of an Electron Cyclotron Resonance Discharge Maintained by
           Continuous-Wave Radiation of a 24 GHz Gyrotron
    • Authors: D. A. Mansfeld; M. E. Viktorov; A. V. Vodopyanov
      Abstract: We have experimentally discovered an instability, which manifests itself as precipitations of hot electrons occurring synchronously with generation of bursts of electromagnetic radiation, in the plasma of an electron cyclotron resonance discharge maintained by a high-power, continuous-wave radiation of a 24 GHz gyrotron, for the first time. The observed instability has the kinetic nature and is determined by the formation of the non-equilibrium velocity distribution of hot particles. Two possible explanations are proposed for the mechanism of wave excitation in a two-component plasma with a stationary source of non-equilibrium particles. The results of the studies performed are of interest for modeling of the dynamics of magnetospheric cyclotron masers.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9738-6
       
  • The Results of Astroclimate Observations in the Short-Wave Length Interval
           of the Millimeter-Wave Range on the Suffa Plateau
    • Authors: G. M. Bubnov; Yu. N. Artemenko; V. F. Vdovin; D. B. Danilevsky; I. I. Zinchenko; V. I. Nosov; P. L. Nikiforov; G. I. Shanin; D. A. Raupov
      Abstract: In this work, we present the results of seasonal astroclimate observations at the RT-70 radiotelescope construction site on the Suffa Plateau (2400 m above sea level). Observations were performed automatically each 11 min round the year starting from November 2014. The shortand long-term laws of variations in the atmospheric-transparency parameters are considered and the statistical diagrams are developed. The statistical data characterizing the astroclimate and allowing one to predict the possibility of radio-astronomy observations in the transparency windows of the millimeter- and submillimeter-wavelength ranges are the basic result of this work.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9745-7
       
  • Multichannel Ka-Band Microwave Oscillator Based on Frequency-Shifted
           Relativistic Backward-Wave Oscillators
    • Authors: M. I. Yalandin; K. A. Sharypov; M. S. Pedos; I. V. Romanchenko; V. V. Rostov; S. N. Rukin; M. R. Ul’maskulov; V. G. Shpak; S. A. Shunailov
      Abstract: Experiments on summation of linearly polarized Gaussian wave beams in free space from two and four synchronous nanosecond Ka-band relativistic backward wave oscillators (BWOs), each having an output power of about 200 MW with controllably shifted oscillator frequencies have been carried out. An about 0.5% frequency shift in one of the channels was equivalent to a one-period phase delay of the carrier frequency. In a two-channel version of the device, a full beat cycle was obtained for a pulse with quadratic (with respect to the number of sources) enhancement of the power flux density at the interference maximum of the integral directional pattern (DP). In the case of a four-channel device, a diagonal displacement of the DP lobes has been demonstrated.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9729-7
       
  • Mode Competition Effect on Frequency Locking of a Multimode Gyrotron by a
           Monochromatic External Signal
    • Authors: V. L. Bakunin; G. G. Denisov; Yu. V. Novozhilova; A. P. Fokin
      Abstract: We study frequency locking of the gyrotron operating mode by a monochromatic external signal under conditions of competition of several modes. The calculations were performed for a megawatt-power 170-GHz gyrotron with the operating TE28.12 mode. Mode interaction of both equidistant and nonequidistant spectra is considered. Frequency detuning of the modes is comparable to the cyclotron resonance bandwidth. Influence of the external-signal power on the boundaries of the frequency locking zones is studied. The possibility to achieve a high orbital efficiency and broadband frequency tuning in the frequency-locking regime is considered.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9730-1
       
  • Millimeter-Wavelength Radiation Used to Sinter Radiotransparent MgAl 2 O 4
           Ceramics
    • Authors: S. V. Egorov; Yu. V. Bykov; A. G. Eremeev; A. A. Sorokin; E. A. Serov; V. V.Parshin; S. S.Balabanov; A. V. Belyaev; A. V.Novikova; D. A. Permin
      Abstract: We have developed a method for production of high-density MgAl2O4 ceramics characterized by low dielectric losses. The method is based on sintering of ultrafine, high-purity powder materials in the electromagnetic field of intense microwave radiation. The initial nanodimensional magnesium-aluminate powder was synthesized by the sol-gel method and sintered in a gyrotron complex operated at a frequency of 24 GHz. The results of studying the conditions and regimes of microwave sintering of MgAl2O4 ceramics are presented, along with its phase features, microstructural peculiarities, and mechanical and dielectric characteristics. The possibility of controlling the microstructure of the sintered material by varying the regime of RF heating is demonstrated.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9736-8
       
  • Microwave Radiometric Complex for Studying the Thermal Structure of the
           Earth’s Atmosphere
    • Authors: V. G. Ryskin; A. A. Shvetsov; M. Yu. Kulikov; M. V. Belikovich; O. S. Bol’shakov; A. A. Krasil’nikov; L. M. Kukin; I. V. Lesnov; N. K. Skalyga; A. M. Feigin
      Abstract: We describe a microwave radiometric complex intended for remote passive monitoring of the atmospheric temperatures from the Earth’s surface. The complex consists of three spectroradiometers operating in a frequency range of 50–60 GHz, which covers the central part of the absorption band of molecular oxygen and its low-frequency slope. The radiometers have different spectral resolutions and allow one to simultaneously study the thermal structure of the surface air, the free troposphere, and the stratosphere. To ensure internal calibration of the intensity of the received atmospheric radiation, a built-in device of the modulator-calibrator type on the basis of the Schottky-barrier GaAs diodes is used. The complex is equipped with an automated system to control the measurement process, calibration, and preliminary data processing. Using the microwave sensing results, we intend to retrieve the atmospheric temperature profiles in an altitude interval of 0.05–55 km on the basis on the Bayesian approach to solving ill-posed inverse problems.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9742-x
       
  • The 700–950 GHz Superconducting Receiving Structures for Radio
           Astronomy
    • Authors: K. I. Rudakov; V. P. Koshelets; A. M. Baryshev; P. N. Dmitriev; A. V. Khudchenko
      Abstract: We have designed, fabricated, and tested the waveguide receiving element, which is based on the tunnel superconductor–insulator–superconductor structures, for the frequency range 790–950 GHz. Two Nb/AlN/NbN tunnel junctions are incorporated in a microstrip line consisting of the bottom NbTiN-film electrode with a thickness of about 300 nm and the top 500 nm-thick aluminum electrode. The production-process optimization allows one to ensure the following characteristics of these junctions: submicron area (0.5 μm2 for each junction), current density about 30 kA/cm2, and band gap width 3.2 mV. Such tunnel junctions ensure the receiver operation in a wide frequency range (700–950 GHz), which was confirmed by the Fourier transform spectroscopy and the noise-temperature measurements. At a frequency of 725 Hz, the corrected noise temperature of the receiver amounts to 120 K, which is only threefold greater than the quantum limit hf/kB, where h is the Planck’s constant, f is the frequency, and kB is Boltzmann’s constant. In the upper part of this frequency range, the noise temperature increases up to 390 K.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9739-5
       
  • Generators of High-Power Ultrashort Microwave Pulses with a Saturable
           Absorber in a Feedback Circuit
    • Authors: N. S. Ginzburg; G. G. Denisov; E. B. Abubakirov; M. N. Vilkov; I. V. Zotova; A. S. Sergeev
      Abstract: We study theoretically the mechanism of the formation of high-power ultrashort microwave pulses, which is based on the effect of passive mode locking in electron generators, whose feedback circuit includes a nonlinear saturable absorber (amplitude filter). The mechanism under consideration is an analog of the well-known method of generation of ultrashort pulses, which is used widely in laser physics. Nevertheless, realization of this method in electron generators has certain specific features connected with the motion of the active medium (electron flow). It is shown that being applied to vacuum electronics, this method is sufficiently universal, and various types of both relativistic and subrelativistic amplifiers operated in wavelength ranges from the centimeter to submillimeter ones can be used for actualization of ultrashort pulse generators as active elements. In the additional section, which acts as a saturable absorber, one can use either the Kompfner absorption effect, or the effect of cyclotron resonance absorption of radiation by a rectilinear electron beam. It is demonstrated on the basis of numerical simulation that the peak power of ultrashort pulses in electron generators with passive mode locking can exceed the power achieved in the stationary generation regimes significantly and, in some cases, the power of the electron flow.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9728-8
       
  • Use of Quasiregular Resonator Cavities with Short Phase Correctors in
           Gyrotrons Operated at Higher Cyclotron Harmonics
    • Authors: I. V. Bandurkin; M. Yu. Glyavin; N. A. Zavolsky; Yu. K. Kalynov; I. V. Osharin; A. V. Savilov
      Abstract: We discuss the possibilities of using quasiregular resonator cavities with short irregularities, which ensure correction of the wave phase, in low-power gyrotrons operated at higher cyclotronfrequency harmonics. The use of such phase correctors can help with solving two problems, namely, increasing the selectivity of excitation of a higher cyclotron harmonic and decreasing the diffraction Q-factor of the gyrotron wave excited in an extended cavity.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9732-z
       
  • Variations in Microwave Radiation of the Nighttime Mesospheric Ozone over
           Moscow
    • Authors: S. B. Rozanov; A. S. Zavgorodniy; A. N. Ignatyev; A. N. Lukin
      Abstract: We consider the instrumentation and methods for the nighttime ground-based measurements of the atmospheric-ozone emission line at a frequency of 142.175 GHz. The ozone-radiation spectra were measured in Moscow in the 2014–2016 cold months with a time resolution of about 2 min. We performed a frequency-time analysis of variations in the differences of the brightness temperatures of the ozone-emission line for the frequency offsets 0–50, 50–150, and 150–250 kHz from the line center. Variations with periods from 6 min to 3 h, which can be related to the wave propagation in the mesosphere and the lower thermosphere, were revealed using the data windows with halfwidths of 10–60 min.
      PubDate: 2017-03-01
      DOI: 10.1007/s11141-017-9743-9
       
  • 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
       
  • Determination of the Trace-Gas Concentrations at the Altitudes of the
           Lower and Middle Mesosphere from the Time Series of Ozone Concentration
    • Authors: A. A. Nechaev; T. S. Ermakova; M. Yu. Kulikov
      Pages: 546 - 559
      Abstract: We present a statistical (Bayesian) approach to retrieving the concentrations of the most important mesospheric trace gases at altitudes of 50–75 km using the photochemical model based on the time series of ozone concentration, which are measured during the daylight hours in one day with the help of the ground-based passive microwave devices. Using the model noisy time series of ozone concentration with allowance for the realistic accuracy of its measurements in the mesosphere, which is ensured by the available ozonometers, the accuracy of retrieving the non-measurable mesospheric characteristics is studied as a function of the altitude and the time-series length.
      PubDate: 2016-12-01
      DOI: 10.1007/s11141-016-9722-6
      Issue No: Vol. 59, No. 7 (2016)
       
 
 
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