Results 251 to 260 of about 927,137 (277)

Small-amplitude red variables

Experimental Astronomy, 1994
The status of photometric monitoring of small amplitude red variables is reviewed. Many of these stars are M type giants, but recently the search has been extended to K type giants.
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On the Pulsation Amplitude of Cepheid Variables

Astrophysics and Space Science, 1972
On the basis of more abundant data a relation logPΔV/logΔR for cepheid variables (Fernie, 1965) is constructed. A linear relation between logP ΔV and logΔR for classical cepheids is found, which perhaps has a break at ΔR=10R ⊙. On the logΔR/logP diagram thes-cepheids (Efremov, 1968) show a distinct sequence.
N. Nikolov, Ts. Tsvetkov
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Variable amplitude vibration generator

The Journal of the Acoustical Society of America, 1983
A variable amplitude vibration generator especially adapted for use with compacting machines in which a primary weight is eccentrically fixed to a power driven rotatably mounted shaft and a secondary weight eccentrically freely rotatably mounted on the shaft is releasably securable to the shaft by activating a remotely controllable detent connection ...
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QRS Amplitude and Shape Variability in Magnetocardiograms

Pacing and Clinical Electrophysiology, 2000
In magnetocardiography, averaging of QRS complexes is often used to improve the signal‐to‐noise ratio. However, averaging of QRS complexes ignores the variation in amplitude and shape of the signals caused, for example, by respiration. This may lead to suppression of signal portions within the QRS complexes.
M, Huck, J, Haueisen, O, Hoenecke, T, Fritschi, U, Leder, H, Nowak   +5 more
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Variable Colour-Amplitude Phase-Contrast Microscopy

Nature, 1949
SEVERAL variable phase-contrast systems have been described. Most of these make use of polarized light in order to obtain variation of phase or amplitude, or both1. An experimental microscope has been constructed by Messrs. Cooke, Troughton and Simms, Ltd., which allows the operator to obtain positive or negative phase-contrast at will, and to control ...
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Actuator stiction compensation via variable amplitude pulses

ISA Transactions, 2018
A novel model free stiction compensation scheme is developed which eliminates the oscillations and also reduces valve movement, allowing good setpoint tracking and disturbance rejection. Pulses with varying amplitude are added to the controller output to overcome stiction and when the error becomes smaller than a specified limit, the compensation ...
B M S, Arifin, C J, Munaro, O F B, Angarita, M V G, Cypriano, S L, Shah   +4 more
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Life-span changes in EEG spectral amplitude, amplitude variability and mean frequency

Clinical Neurophysiology, 1999
The objectives were to assess life-span alterations in intrasubject variability of EEG spectral amplitudes and in amplitude and mean frequency computed from spectral amplitude profiles.EEG was recorded from the central and occipital scalp of 222 healthy males aged 4 to 90 years.
R E, Dustman, D E, Shearer, R Y, Emmerson   +2 more
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Fatigue Reliability: Variable Amplitude Loading

Journal of the Structural Division, 1982
Models which designers use to predict fatigue under variable amplitude and random loading are summarized. Basic terminology associated with random process theory is presented. Models for computing fatigue damage associated with various statistical distributrions of stress ranges are reviewed.
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NDVI seasonal amplitude and its variability

International Journal of Remote Sensing, 2008
NDVI (Normalized Difference Vegetation Index) is a remotely sensed index of vegetation greenness.
Y. Julien, J. A. Sobrino
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Multiaxial Fatigue Under Variable Amplitude Loads

Journal of Engineering Materials and Technology, 1999
Multiaxial fatigue under variable amplitude loading is investigated using Kandil et al.’s parameter, rainflow cycle counting on the shear strain history, and the Miner-Palmgren damage rule. Fatigue data are obtained on tubular specimens of S45C steel under proportional and nonproportional tension-torsion loading.
Kim, KS, Park, JC, Lee, JW
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