Results 231 to 240 of about 16,712,159 (288)

A high frequency harmonic VCO with an artificial varactor

1998 IEEE International Conference on Electronics, Circuits and Systems. Surfing the Waves of Science and Technology (Cat. No.98EX196), 2002
A tunable LC-oscillator utilising an artificial varactor is presented in this paper. The proposed variable capacitor is based on the well-known Miller effect. A theoretical model is developed to study the capacitance tuning range and the corresponding Q-value.
Kari Stadius, Risto Kaunisto, Veikko Porra   +2 more
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Effects of high-frequency harmonics on cardiac relaxation indices

American Journal of Physiology-Heart and Circulatory Physiology, 1981
This study was designed to determine the degree to which the systematic distortions in the pressure curve due to recording and filtering systems influence the relaxation indices. The purposes are 1) to analyze the dependency on the high frequencies of the relaxation and contractility parameters, 2) to determine the degree to which the catheter ...
G, Martín, J V, Gimeno, A, Ramirez, J, Cosín, J, Báguena   +4 more
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Harmonic emission from high frequency gyrotrons

1983 Eighth International Conference on Infrared and Millimeter Waves, 1983
Second harmonic emission of power levels of ≳ 25 kW and frequencies up to 302 GHz have been achieved in a short pulse gyrotron designed for operation at the fundamental in the 110–170 GHz band. Frequency, starting current and power level measurements for several harmonic modes have been made.
J. L. Byerly, B. G. Danly, K. E. Kreischer, P. Woskoboinikow, W. J. Mulligan, R. J. Temkin   +5 more
openaire   +1 more source

Status of a high-frequency harmonic amplifier's development

IEEE Conference Record - Abstracts. 2002 IEEE International Conference on Plasma Science (Cat. No.02CH37340), 2003
Summary form only given, as follows. The harmonic amplifier (HARA) is a very compact, high efficiency amplifier that has been under development at Microwave Technologies in the past few years. The HARA uses a two-cavity system in conjunction with a spiraling beam to produce high-frequency radiation.
J.E. Velazco, P.H. Ceperley
openaire   +1 more source

High-frequency section of harmonics of undulatory radiation

Soviet Physics Journal, 1991
In this paper, the spectral'distribution is computed of the radiation of an undulator containing a large number of periods in the case of arbitrary transverse velocity. An analytic expression is found for the function cutting off the radiation spectrum on the boundaries of each harmonic.
V. Yu. Muravyatkin, M. M. Nikitin, V. Ya. �pp   +2 more
openaire   +1 more source

High frequency SAW devices based on third harmonic generation

Ultrasonics, 2006
We demonstrate the third harmonic generation in a ZnO/Si layered structure to obtain high frequency SAW devices. This configuration eliminates the need of high lithography resolution and allows easy integration of such devices and electronics on the same wafer.
L, Le Brizoual, O, Elmazria, F, Sarry, M, El Hakiki, A, Talbi, P, Alnot   +5 more
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High-Frequency Contrast Harmonic Imaging of Ophthalmic Tumor Perfusion

American Journal of Roentgenology, 2005
Schlottmann K, Fuchs-Koelwel B, Demmler-Hackenberg M, Gabel V-P, Scholmerich J he evaluation of symptomatic or incidentally diagnosed ophthalmic tumors usually is performed using funduscopy and Aand B-mode sonography. Additional techniques are Doppler modes [1], fluorescence or indocyanine green angiography [2], CT [3], and MR tomography [4].
Klaus, Schlottmann, Barbara, Fuchs-Koelwel, Martina, Demmler-Hackenberg, Veit-Peter, Gabel, Jürgen, Schölmerich   +4 more
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Influence of high frequency current harmonics on (Smart) energy meters

2015 50th International Universities Power Engineering Conference (UPEC), 2015
(Smart) meters which use Rogowski coils are verified to be sensitive for the high frequency signals. This will lead to incorrect records of consumer's energy consumption. Power electronic devices are the possible harmonic sources. In this paper, the output currents of photovoltaic (PV) systems are measured in the range 2-150kHz and the high frequency ...
Jiang, L., Ye, G., Xiang, Y., Cuk, V., Cobben, J.F.G.   +4 more
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High-frequency harmonic distortion in feedback amplifiers: analysis and applications

IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 2003
An approach for the evaluation of high-frequency harmonic-distortion factors in feedback systems is proposed and the results obtained are applied to feedback amplifiers. Under the assumption that transistors are not driven out of their linear operating regions, small-signal analysis and conventional algebra are exploited to derive understandable and ...
PALUMBO, Gaetano, PENNISI, Salvatore
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High frequency resolution harmonic analysis

2016 International Conference on Development and Application Systems (DAS), 2016
The acquisition time of a real life signal limits the resolution of its spectrum, because it directly affects the orthogonality of its spectrum components. There is no spectral analysis yet to distinguish frequencies that are not orthogonal. A spectral analysis for distinguishing non orthogonal frequencies is proposed here. A system of linear equations
openaire   +1 more source