Results 261 to 270 of about 439,956 (300)

An Improvement in Constant-Frequency Oscillators

Proceedings of the IRE, 1939
A simple oscillator circuit is described in which, by means of impedance transformation, the tube impedances are made small relative to those of the tuned circuit. As a result all frequency variations inherent in the tube are reduced by a factor of ten, or more.
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Self-Oscillating Constant-Current Fluorescent Lamp Driver

2006 IEEE 24th Convention of Electrical & Electronics Engineers in Israel, 2006
A high frequency AC current-sourcing driver that can feed electrical loads with a constant current that is independent of the load resistance is presented, analyzed and tested experimentally. The power source is a self-oscillating inverter that includes a resonant network and a Current Comparing and Toggling Circuit (CCTC) that is used to generate the ...
Sam Ben-Yaakov, Mor Mordechai Peretz, Jorge M. Parra   +2 more
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Oscillating metrics and the cosmological constant

AIP Conference Proceedings, 2001
Oscillating metric solutions are found in theories with higher powers of curvature in the action. Their consideration is motivated by the cosmological constant problem.
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Master-Slave Coupled Piecewise Constant Spiking Oscillators

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2011
This paper presents pulse-coupled piecewise constant spiking oscillators (PWCSOs) consisting of two PWCSOs and a coupling method is master-slave coupling. The slave PWCSO exhibits chaos because of chaotic response of the master one. However, if the parameter varies, the slave PWCSO can exhibit the phenomena as a periodicity in the phase plane. We focus
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Plasma oscillations in a constant electric field

Plasma Physics, 1969
Summary: The dispersion relation for longitudinal oscillations has been derived for a plasma in a uniform applied electric field for the case where the collision integral can be replaced by a Fokker-Planck term with distinct and energy-dependent relaxation times for momentum and energy.
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Pure odd-order oscillators with constant excitation

Journal of Sound and Vibration, 2011
Abstract In this paper the excited vibrations of a truly nonlinear oscillator are analyzed. The excitation is assumed to be constant and the nonlinearity is pure (without a linear term). The mathematical model is a second-order nonhomogeneous differential equation with strong nonlinear term.
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Oscillations Of Equations With Piecewise Constant Arguments

1991
Abstract As we shall see, within intervals of certain length, each of the above equations has the structure of a continuous dynamical system, while the continuity of the solution at the points that join consecutive intervals leads to difference equations.
I Györi, G Ladas
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Getting Through to Circadian Oscillators: Why Use Constant Routines?

Journal of Biological Rhythms, 2002
Overt 24-h rhythmicity is composed of both exogenous and endogenous components, reflecting the product of multiple (periodic) feedback loops with a core pacemaker at their center. Researchers attempting to reveal the endogenous circadian (near 24-h) component of rhythms commonly conduct their experiments under constant environmental conditions ...
Duffy, JE, Dijk, DJ
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On Multimode Oscillators with Constant Time Delay

Proceedings of the IRE, 1957
Special emphasis is paid to narrow-band systems with a small number of modes, and to high switching speed. Sufficient stability conditions presented have been derived by use of a first-order Taylor approximation, which substantially reduces algebraic complexity. The system may deviate considerably from quasi-linearity.
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Cosmological consequences of high-frequency oscillations of Newton’s constant

Physical Review Letters, 1991
We show that high-frequency, small-amplitude oscillations of Newton's constant {ital G} can dramatically alter cosmology even if the frequency is very high compared to the expansion rate. For example, it is possible to have a spatially flat universe in which dynamical tests of {Omega}==(matter density)/(critical density)---tests which attempt to ...
, Accetta, , Steinhardt
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