Results 171 to 180 of about 75,653 (214)
Some of the next articles are maybe not open access.
Low-Frequency Brain Oscillations in Schizophrenia
JAMA Psychiatry, 2016Understanding 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.
openaire +2 more sources
A compact, low‐frequency, memristor‐based oscillator
International Journal of Circuit Theory and Applications, 2014SummaryA 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 +3 more
openaire +2 more sources
Low frequency oscillations in oscillators using Gunn diodes
International Journal of Electronics, 1973Abstract 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
openaire +1 more source
Very low frequency quadrature oscillator
Review of Scientific Instruments, 2000We propose a low-cost, practical, quadrature oscillator with a period, Tq, which may be very long (Tq⩾1 s). We illustrate this design with an oscillator that produces two quadrature sinusoidal waves with a 1 s period. This design can be modified to provide signals of any shape by adjusting the value of one or more resistors.
openaire +1 more source
Amplitude-stabilized transistorized low frequency oscillator†
International Journal of Electronics, 1973Abstract A stable oscillator has been developed with an active frequency-selective circuit using a Wien network, adjusted below the threshold of regeneration, by providing amplitude-limited aperiodic positive feedback through a parallel path. With this method the amplitude of oscillation remains stable and can be controlled continuously while the ...
S. K. DAS, GITA DAS
openaire +1 more source
Demonstration of Low-Frequency Electrical Oscillations
American Journal of Physics, 1972An underdamped LCR circuit has been constructed which has an oscillatory period in the region of 0.5 to 5 sec. The current and emf in the circuit are measured by means of a galvanometer. The time behavior of the circuit is studied by means of a light beam chopper and sampling technique.
Bal Krishna Sharma, Babulal Saraf
openaire +1 more source
Low-frequency, low-distortion digital quadrature oscillator
Journal of Physics E: Scientific Instruments, 1989Digital recursive and non-recursive filtering techniques have both been exploited to build a low-frequency (0.5-50 Hz), low-distortion digital quadrature oscillator. This generator shows an amplitude constant to within 0.3% over the frequency range, and the quadrature phase error is within +or-0.05 degrees .
openaire +2 more sources
Ultra-Low-Frequency, Three-Phase Oscillator
Proceedings of the IRE, 1954This paper describes the design of a three-phase oscillator covering the range from 0.01 to 1,000 cycles per second. The problems peculiar to this frequency range, and their solutions, are discussed. Certain advantages inherent in three-phase operation are explained.
openaire +1 more source