Results 281 to 290 of about 28,076,457 (358)

Analysis of acoustic noise in MRI

Magnetic Resonance Imaging, 1997
Acoustic or sound noise due to gradient pulsing has been one of the problems in magnetic resonance imaging (MRI), both in patient scanning as well as in many areas of psychiatric and neuroscience research such as functional MRI. Our recent observations in functional MRI for the visual and motor cortex show very different results with sound noise in ...
Z H, Cho, S H, Park, J H, Kim, S C, Chung, S T, Chung, J Y, Chung, C W, Moon, J H, Yi, C H, Sin, E K, Wong   +9 more
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Analysis of Noise in Quorum Sensing

OMICS: A Journal of Integrative Biology, 2003
Noise may play a pivotal role in gene circuit functionality, as demonstrated for the genetic switch in the bacterial phage λ. Like the λ switch, bacterial quorum sensing (QS) systems operate within a population and contain a bistable switching element, making it likely that noise plays a functional role in QS circuit ...
Chris D, Cox, Gregory D, Peterson, Michael S, Allen, Joseph M, Lancaster, James M, McCollum, Derek, Austin, Ling, Yan, Gary S, Sayler, Michael L, Simpson   +8 more
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Theoretical analysis of photoreceptor noise

Journal of Theoretical Biology, 1979
Abstract Recent experiments indicate that voltage noise in photoreceptors results from variation of total conductance, due to random spontaneous opening and closing of light-sensitive ionic channels, whose rate is governed in turn by modulation of internal-transmitter concentration, by photon noise, and by fluctuations in free calcium concentration ...
S S, Mangoubi, Y Y, Zeevi
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Profile analysis and background noise

The Journal of the Acoustical Society of America, 1986
Spectral shape discrimination, or profile analysis, of complex waveforms (21 components) in the presence of broadband noise and special sinusoidal maskers of random amplitude was studied. The first experiment involved the discrimination between a standard flat spectrum and a ‘‘rippled’’ spectrum in broadband noise of different spectrum levels ...
D M, Green, T G, Forrest
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On autocorrelation analysis of jet noise

The Journal of the Acoustical Society of America, 2013
Meaningful use of the autocorrelation in jet noise analysis is examined. The effect of peak frequency on the autocorrelation function width is removed through a temporal scaling prior to making comparisons between measurements or drawing conclusions about source characteristics.
Blaine M, Harker, Kent L, Gee, Tracianne B, Neilsen, Alan T, Wall, Sally A, McInerny, Michael M, James   +5 more
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Fault feature extraction of rotating machinery using a reweighted complete ensemble empirical mode decomposition with adaptive noise and demodulation analysis

, 2020
Fault feature extraction is crucial to detect failures as earlier as possible in fault diagnosis of rotating machinery. Due to the influence of environment noise and interference, the signal to noise ratio (SNR) of fault feature is relatively low in the ...
Liming Wang, Y. Shao
semanticscholar   +1 more source

Temporofunctional crosstalk noise analysis

Proceedings of the 40th conference on Design automation - DAC '03, 2003
Noise affects circuit operation by increasing gate delays and causing latches to capture incorrect values. This paper proposes a method of characterizing correlation of signal transitions in multiple nets by considering both timing and functionality of the signals, and uses it in an analysis procedure to eliminate noise faults that cannot actually ...
Donald Chai, Alex Kondratyev, Yajun Ran, Kenneth H. Tseng, Yosinori Watanabe, Malgorzata Marek-Sadowska   +5 more
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A Statistical Analysis of Pupil Noise

IEEE Transactions on Biomedical Engineering, 1966
The random fluctuations of human pupillary area provide an interesting example of a stochastic process in a biological system. Statistical theory and system analysis have guided the authors in performing experiments which reveal important properties involved in the random process.
S F, Stanten, L, Stark
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Ridge Analysis With Noise Variables

Technometrics, 2005
Ridge analysis is a graphical and inferential method for exploring optimum factor levels of a response surface at fixed distances from the center of the experimental region. This article proposes an approach to doing a ridge analysis for optimizing a response surface in the presence of noise variables. We extend the ridge analysis method of Peterson to
John J. Peterson, Andrew M. Kuhn
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An analysis of spontaneous noise complaints

Environmental Research, 1977
Abstract Fourteen hundred protocols of noise complaints to public authorities have been content analyzed by three trained psychologists. The analysis shows that people mostly complain about traffic noise (37.5% of total) and sounds caused by trade or business (33.5%). With regard to traffic noise, the moving road traffic (particularly trucks) and air
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