Results 211 to 220 of about 181,882 (261)
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Dielectric Relaxation at Ultra Low Frequency
Ferroelectrics, 2003The isothermal charging and discharging currents were recorded for polyamide 11, polyethylene terephthalate and low density polyethylene in a large range of temperatures below and above the glass-rubber transition temperature of the amorphous phase, for different electrical fields and different charging and discharging times.
E. R. Neagu +2 more
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Ultra-low-frequency atmospherics
IRE International Convention Record, 2005The earth and the ionosphere together form a spherical-type resonant cavity. The natural frequency of this resonator was calculated by Schumann to be approximately 10 cps. In order to test this result, it was decided to determine experimentally whether or not there might actually exist in the atmosphere signals which would lie within this frequency ...
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Ultra low frequency waves in the magnetosphere
Space Science Reviews, 1970The behaviour of continuous pulsations pc 2–5 observed on the ground has been known for some time. They seldom occur at night, their amplitudes generally increase towards the auroral zones and the sense of rotation of their polarisation often agrees with surface waves on the magnetopause.
J.W. Dungey, D.J. Southwood
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Ultra low frequency precordial movements—kinetocardiograms∗
The American Journal of Cardiology, 1959K I~ETOC~RDIOGRAMS are the graphic representation of ultra low frequency displacement precordial vibrations. The frequent! components of these motions usually lie between 1 and IO cycles per second; however, Fourier analysis has revealed higher frequencies present but of less significance.
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Myoelectric reactions to ultra-low frequency and low-frequency whole body vibration
European Journal of Applied Physiology and Occupational Physiology, 19885 healthy males were exposed to vertical sinusoidal whole body vibration (WBV) at 5 frequencies (F1 = 0.315 Hz, F2 = 0.63 Hz, F3 = 1.25 Hz, F4 = 2.5 Hz, F5 = 5.0 Hz) and 2 intensities (I1 = 1.2 ms-2 rms, F1-F5; I2 = 2.0 ms-2 rms, F2-F5). Erector spinae EMGs were derived at the levels of the first thoracic (T1) and third lumbar (L3) spinous processes ...
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Voltage-to-Frequency Converter for Ultra-Low-Voltage Applications
2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2019The paper is focused on the design and analysis of a Voltage-to-Frequency Converter (VFC) that was implemented in 130 nm CMOS technology. The proposed VFC was designed using the bulk-driven technique and can reliably work with the power supply voltage of 0.4 V.
Daniel Arbet +3 more
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An ultra-broadband low-frequency magnetic resonance system
Journal of Magnetic Resonance, 2014MR probes commonly employ resonant circuits for efficient RF transmission and low-noise reception. These circuits are narrow-band analog devices that are inflexible for broadband and multi-frequency operation at low Larmor frequencies. We have addressed this issue by developing an ultra-broadband MR probe that operates in the 0.1-3MHz frequency range ...
S, Mandal +5 more
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Ultra Low Frequency Low Power Oscillator using Ultra-Capacitor and Advanced Flywheel
2018 International Conference on Smart Electric Drives and Power System (ICSEDPS), 2018Ultra-low-frequencies (< 1.0 Hz) are required for signal transmission in rocky layers for seismic studies. This frequency region is tougher to work on. Various methods of generating these frequencies have been in use since several years. In electrical science, it has been known ever-since that energy in electric field of a capacitor and energy in ...
Rohan Bherde +2 more
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A frequency to voltage converter with ultra-low residual frequency noise
CLEO Pacific Rim Conference, 2018We report on the process of residual noise suppression in a frequency to voltage converter based on a frequency difference multiplication method, for measuring frequency noise of ultra-stable laser. The double sideband frequency noise is lower than −40 dB Hz2/Hz in a bandwidth from 3 Hz to 100 kHz.
Lulu Yan +6 more
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Ultra low frequency transducer and loud speaker comprising same
The Journal of the Acoustical Society of America, 2004An ultra low frequency transducer or subwoofer for automotive speaker systems with a concave diaphragm and a pleated surround. Preferably, the periphery of the diaphragm is square or rectangular and sized to be substantially coextensive with the front of the speaker housing or cabinet.
Steven M. Irby, William O. Doering
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