Results 241 to 250 of about 452,637 (291)

Low-frequency diffusion flame oscillations

Combustion and Flame, 1975
Abstract The low-frequency oscillation that is characteristic of small-scale diffusion flames is also shown to dominate the so-called turbulent flamebrush even at flowrates high enough to lift the flame from the burner. For free diffusion flames, the frequency of oscillation is always of the order of 10 Hz and is not affected by either the dimensions
A.J. Grant, J.M. Jones
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Amplitude stabilized low frequency oscillator†

International Journal of Electronics, 1972
Abstract The paper describes an amplitude stabilized very low frequency sinusoidal oscillator generating a frequency as low as 0.01 Hz. It uses a second-order all-pass network and an operational amplifier interconnected in a feedback loop to form a highly selective amplifier.
S. K. DAS, GITA DAS
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Thermally induced low-frequency oscillations

ZAMP Zeitschrift f�r angewandte Mathematik und Physik, 1985
This paper discusses nonlinear thermally induced oscillations in quasi- one dimensional flows in ducts. In practice such oscillations are frequently observed in furnaces and combustion chambers. The problem considered involves entropy disturbances which are convected through a nozzle at the end of a tube, thereby producing an acoustic wave which ...
Keller, J. J., Egli, W., Hellat, J.
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Low-Frequency Oscillations

2017
Since the early 1970s and the early 1980s, the Madden-Julian Oscillation (MJO) in the tropics and some teleconnections in worldwide have respectively become two important topics in climate study. The former is moving low-frequency fluctuations while the latter is standing oscillations.
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Low frequency temperature forcing of chemical oscillations

Physical Chemistry Chemical Physics, 2011
The low frequency forcing of chemical oscillations by temperature is investigated experimentally in the Belousov-Zhabotinsky (BZ) reaction and in simulations of the Oregonator model with Arrhenius temperature dependence of the rate constants. Forcing with temperature leads to modulation of the chemical frequency.
Jan, Novak, Barnaby W, Thompson, Mark C T, Wilson, Annette F, Taylor, Melanie M, Britton   +4 more
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Amplitude Stabilized Low Frequency Oscillator

IETE Journal of Research, 1957
AbstractThe performance of a low frequency oscillator, stabilized with biased diodes or with lamps is described. The harmonic content in the output with different initial negative damping has been calculated and depicted in graphical form. Variation of the output amplitude with the variation of initial damping is also calculated.A circuit arrangement ...
A. K. Choudhury, B. R. Nag
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Weak low-frequency electromagnetic oscillations in water

Electromagnetic Biology and Medicine, 2016
Recent observations of low-frequency electromagnetic oscillations in water suggest an inductive structural component. Accordingly, we assume a helical basis enabling us to model water as an LC tuned oscillator. A proposed tetrahedral structure consisting of three water molecules and one hydronium ion is incorporated into the Boerdijk-Coxeter tetrahelix
A R, Liboff, Claudio, Poggi, Piero, Pratesi   +2 more
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Low-Frequency Brain Oscillations in Schizophrenia

JAMA Psychiatry, 2016
Understanding thebrainnetworks thatproduce thesymptomsof schizophrenia is a major goal of modern neuroscience. There is increasing evidence that brain function depends critically on oscillations, and ithas thereforebeenof interest todeterminewhether the oscillatorypropertiesof thebrain areabnormal in schizophrenicpatients.
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A compact, low‐frequency, memristor‐based oscillator

International Journal of Circuit Theory and Applications, 2014
SummaryA relaxation oscillator using a memristor is hereby presented. The memristor is used to substitute the function of a capacitor in an equivalent RC oscillator. The voltage across the memristor changes according to the quantity and polarity of the current passing through, thus substituting the changing voltage across a capacitor in the equivalent ...
Kyriakides, Elias, Georgiou, J., Kyriakides, Elias, Georgiou, J.   +3 more
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Low frequency oscillations in oscillators using Gunn diodes

International Journal of Electronics, 1973
Abstract Experiments are reported which indicate that simultaneous oscillations at two frequencies may be generated in a Gunn diode oscillator. The lower frequency is within the range 1·8-0·44GHZ, while the higher frequency lies between 1·8 and 3·75 GHz, the transit-time frequency being l·8GHz.
P. C. RAKSHIT, H. PARIA, B. R. NAG
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