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Castejon, F.
Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)1993
Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)1993
AbstractAbstract
[en] Preliminary studies for ion Cyclotron Resonance Heating (ICRH) in the frequency range f=3-150 MHz are presented for TJ-IU torsatron. This wide range implies the use of two different theoretical models. The first valid for high frequency, where the WKB approximation is applicable, and the second one which solves the full wave equation in one dimension. The high frequency calculations have been made using a ray tracing code and taking into account the magnetic field and plasma 3-D inhomogeneity. The results obtained in this case are presented in the first paper of this report, being the most important the criterion to avoid Fast Wave (FW)-Slow Wave (SW) coupling at Lower Hybrid Resonance, near the plasma edge, and the existence of so called Localized Modes. For the low frequency range wave-length is of the size of the plasma radius, there fore, the WKB approximation cannot be used. In this case a 1-D model is used which disregards toroidal effects, to study the main available heating scenarios which are presented in the second work of this report. The studies are made for hydrogen, deuterium and mixed plasmas with and without He3 majority. Finally, the antenna designs to reach these several scenarios are presented in the third paper. Two different antenna models are provided for SW excitation, one of the current type and the other one of potential type. A third antenna is designed to excite FW which is similar to the current type antenna for SW, but rotated 90 degree centigree. (Author)11 refs
Primary Subject
Source
1993; 26 p
Record Type
Report
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Castejon, F.; Longinov, A.V.; Rodriguez R, L.
Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)1993
Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)1993
AbstractAbstract
[en] Preliminary studies for Ion Cyclotron Resonance Heating (ICRH) in the frequency range f=3-150 MHz are presented for TJ-IU torsatron. This wide range implies the use of two different theoretical models. The first valid for high frequency, where the WKB approximation is applicable, and the second one which solves the full wave equation in one dimension. The high frequency calculations have been made using a ray tracing code and taking into account the magnetic field and plasma 3-D inhomogeneity. The results obtained in this case are presented in the first paper of this report, being the most important the criterion to avoid Fast Wave (fw)-slow wave (SW) coupling at Lower Hybrid Resonance, near the plasma edge, and the existence of so called Localized Modes. for the low frequency range wave-length is of the size of the plasma radius, therefore, the WKB approximation cannot be used. In this case a 1-D model is used which disregards toroidal effects, to study the main available heating scenarios which are presented in the second work of this report. the studies are made for hydrogen, deuterium and mixed plasmas with and without He3 minority. Finally, the antenna designs to reach these several scenarios are presented in the third paper. Two different antenna models are provided for SW excitation, one of the current type and the other one of potential type. A third antenna is designed to excite FW which is similar to the current type antenna for SW, but rotated 90 degree Celsius
Primary Subject
Source
1993; 12 p
Record Type
Report
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Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
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Source
Letter-to-the-editor.
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Journal Article
Journal
Nature (London); v. 245(5420); p. 86-87
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INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A broadband CMOS intermediate frequency (IF) variable-gain amplifier (VGA) for DRM/DAB tuners is presented. The VGA comprises two cascaded stages: one is for noise-canceling and another is for signal-summing. The chip is fabricated in a standard 0.18 μm 1P6M RF CMOS process of SMIC. Measured results show a good linear-in-dB gain characteristic in 28 dB dynamic gain range of -10 to 18 dB. It can operate in the frequency range of 30-700 MHz and consumes 27 mW at 1.8 V supply with the on-chip test buffer. The minimum noise figure is only 3.1 dB at maximum gain and the input-referred 1 dB gain compression point at the minimum gain is -3.9 dBm.
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1674-4926/30/3/035002; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Semiconductors; ISSN 1674-4926;
; v. 30(3); [5 p.]

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Reference NumberReference Number
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AbstractAbstract
No abstract available
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Journal Article
Journal
Astronomical Journal; v. 77(5); p. 345-349
Country of publication
Reference NumberReference Number
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INIS IssueINIS Issue
AbstractAbstract
[en] Observations have been made of the supernova remnant 3C 58 with the Westerbork Synthesis Radio Telescope at 6 and 49 cm. These measurements may provide evidence for the possible association of 3C 58 with SN 1181. (Auth.)
Primary Subject
Source
Danziger, J. (European Southern Observatory, Garching (Germany, F.R.)); Gorenstein, P. (Harvard Univ., Cambridge, MA (USA). Center for Astrophysics) (eds.); 614 p; ISBN 90-277-1666-8;
; 1983; p. 341-342; D. Reidel; Dordrecht (Netherlands); International Astronomical Union symposium no. 101 on supernova remnants and their X-ray emission; Venice (Italy); 30 Aug - 2 Sep 1982

Record Type
Book
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Conference
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AbstractAbstract
No abstract available
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Source
Meeting of the Astronomical Society of Australia; Adelaide, Australia; 13 Dec 1971
Record Type
Journal Article
Literature Type
Conference
Journal
Proc. Astron. Soc. Aust; v. 2(2); p. 89-90
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Microstructure crosscorrelation of pulses observed simultaneously at various separations in frequency in the range of 196 to 1420 MHz was done for PSR 0950+08 and PSR 1133+16 at the Arecibo Observatory. Microstructure and subpulse components were identified in the crosscorrelations, and their behaviour vs. pulse longitude was studied. Drastic differences in the subpulse and microspulse behaviour are noted, related in particular to component separation in the double peak average pulse profile of PSR 1133+16. Here the subpulses follow the average pulse profile component separation but the microstructure does not. Interpretation and constraints in terms of some current theories are also presented. (Auth.)
Primary Subject
Source
Sieber, W.; Wielebinski, R. (Max-Planck-Institut fuer Radioastronomie, Bonn (Germany, F.R.)) (eds.); International Astronomical Union Symposium; no. 95; 475 p; ISBN 90-277-1280-8;
; 1981; p. 191-196; D. Reidel; Dordrecht, Netherlands; 95. International Astronomical Union symposium on pulsars; Bonn, Germany, F.R; 26 - 29 Aug 1980

Record Type
Book
Literature Type
Conference
Country of publication
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INIS VolumeINIS Volume
INIS IssueINIS Issue
Hankins, T.H.
California Univ., La Jolla, San Diego (USA)1971
California Univ., La Jolla, San Diego (USA)1971
AbstractAbstract
No abstract available
Primary Subject
Source
1971; 127 p; University Microfilms Order No. 72-7592.; Thesis. (Ph.D.).
Record Type
Report
Literature Type
Thesis/Dissertation
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Nachev, I; Petkov, P Z, E-mail: ivaylonachev@yahoo.com, E-mail: pjpetkov@tu-sofia.bg2019
AbstractAbstract
[en] The paper present design of low-cost antenna array for RFID indentification in the frequency range 865 to 868 Mhz. The design antenna has enhanced coverage (pattern) and beam-steering capabilities. It can serve as a base element for more sophisticated RFID readers with direction finding capabilities and improved distance of tag reading. (paper)
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Secondary Subject
Source
TechSys 2019: 8. International Scientific Conference on Engineering, Technologies and Systems; Plovdiv (Bulgaria); 16-18 May 2019; Available from http://dx.doi.org/10.1088/1757-899X/618/1/012017; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
IOP Conference Series. Materials Science and Engineering (Online); ISSN 1757-899X;
; v. 618(1); [8 p.]

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