Results 281 to 290 of about 14,538,904 (339)

Multitone signals with low crest factor

IEEE Transactions on Circuits and Systems, 1986
Using some results from the recent mathematics literature, we show how to generate signals with perfect low-pass or bandpass spectra which have very low crest factors (under 6 dB). An application to multitone frequency response testing is given.
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Industrial Impulse Noise, Crest Factor and the Effect of Earmuffs

American Industrial Hygiene Association Journal, 1987
Noise measurements were taken inside and outside earmuffs worn by 238 workers at 21 industrial plants in order to evaluate exposure to noise and to measure the attenuation by earmuffs used at workplaces. The means of the equivalent noise levels were 93 dB outside the earmuffs and 76 dB inside them. The mean earmuff attenuation was 17 dB.
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Factors controlling lineage specification in the neural crest

2000
The neural crest is a transitory tissue of the vertebrate embryo that originates in the neural folds, populates the embryo, and gives rise to many different cell types and tissues of the adult organism. When neural crest cells initiate their migration, a large fraction of them are still pluripotent, that is, capable of generating progeny that consists ...
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Factors influencing detection of nesting crested caracaras

The Journal of Wildlife Management, 2011
AbstractManagement of crested caracaras (Caracara cheriway), focuses on nests identified during surveys. If no nests are found, management can be suspended. Thus, false negatives can have substantial consequences. We surveyed 49 breeding territories to assess factors with the potential to cause false negatives in detecting nests of crested caracaras ...
James F. Dwyer, Joan L. Morrison, James D. Fraser   +2 more
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On the crest factor of noise from supersonic jets

The Journal of the Acoustical Society of America, 2013
An important consideration in characterizing noise from heated, supersonic jets is the crest factor (CF). The large CF in high-speed jet noise is the result of a positively skewed probability density function for the waveform, which translates into infrequently occurring, large-amplitude positive peak pressures.
Kent L. Gee, Tracianne B. Neilsen, Michael M. James   +2 more
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High crest factor loads on UPS systems

Conference Proceedings., Eleventh International Telecommunications Energy Conference, 2003
Some of the problems that can be caused by high crest factor (HCF) in UPSs (uninterruptible power supply systems) are outlined. It is noted that the effect of a high crest factor load on a UPS will depend on the technique used to generate the UPS output voltage. Ways to avoid problems with HCF are discussed, including load balancing, the use of a fully
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The significance of distortion and crest factors in AC measurements

IEE Colloquium on Precision AC Voltage and Current Measurements up to 1 MHz, 1997
The uncertainty of any AC measurement is increased when the signal departs from a perfect sine wave. Depending on the nature of the distortion, it may be convenient to examine the problem in the frequency or time domain. When a waveform is distorted from the ideal sine form, harmonics are present.
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On the crest factor for dissipative partial differential equations

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2019
In this work, we have introduced and then computed the so-called crest factor associated with solutions of dissipative partial differential equations (PDEs). By taking two paradigmatic dissipative PDEs, we estimated in an explicit and accurate manner the values of the crest factor of their solutions.
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Crest Factor Measurement by Experimental Vibration Analysis for Preventive Maintenance of Bearing

ICRRM 2019 – System Reliability, Quality Control, Safety, Maintenance and Management, 2019
G. Kondhalkar, G. Diwakar
semanticscholar   +1 more source

hPSC-derived sacral neural crest enables rescue in a severe model of Hirschsprung’s disease

Cell Stem Cell, 2023
Andrew P Minotti, Lorenz Studer
exaly