نتایج جستجو برای: flicker fusion

تعداد نتایج: 122204  

1998
Sharma Kolluri Mark F. McGranaghan

An EMTP-based arc furnace model was developed for evaluation of flicker concerns associated with supplying a large integrated steel mill as they go from one to two furnace operation and as system changes are implemented that will affect the short circuit capacity at the 230 kV power supply substation. The model includes a dynamic arc representation which is designed to be characteristic of the ...

2017
James M. Stringham Nicole T. Stringham Kevin J. O’Brien

The dramatic rise in the use of smartphones, tablets, and laptop computers over the past decade has raised concerns about potentially deleterious health effects of increased "screen time" (ST) and associated short-wavelength (blue) light exposure. We determined baseline associations and effects of 6 months' supplementation with the macular carotenoids (MC) lutein, zeaxanthin, and mesozeaxanthin...

Journal: :Journal of neuroscience methods 2008
Matthew P Fiesta David M Eagleman

As the frequency of a flickering light is increased, the perception of flicker is replaced by the perception of steady light at what is known as the critical flicker fusion threshold (CFFT). This threshold provides a useful measure of the brain's information processing speed, and has been used in medicine for over a century both for diagnostic and drug efficacy studies. However, the hardware fo...

Journal: :Investigative ophthalmology & visual science 2002
Mineo Kondo Paul A Sieving

PURPOSE To evaluate the relative contributions of photoreceptors and postphotoreceptoral activity to the primate 32-Hz flicker electroretinogram (ERG) elicited by sine-wave, square-wave, and pulse stimuli. METHODS Flicker 32-Hz ERGs were evoked from four adult rhesus (Macaca mulatta) monkeys using sine-wave, square-wave, and 4-ms pulse trains and xenon photostrobe flicker stimuli. All stimuli...

2015
B. Nirosha

Due to the wind speed variation, wind shear and tower shadow effects, grid connected wind turbines are the sources of power fluctuations which may produce flicker during continuous operation. This paper presents a model of an MW-level variable speed wind turbine with a doubly fed induction generatorto investigate the flicker emission and mitigation issues. An individual pitch control (IPC) stra...

Journal: :Australian and New Zealand journal of ophthalmology 1999
A J Vingrys K Pesudovs

AIM Flicker deficits have been reported in various maculopathies, including age-related macular degeneration. We test whether flicker losses exist in patients with central serous chorioretinopathy (CSC) and whether the size and flicker frequency of the target is important in detecting such losses. METHODS We examined four CSC patients with temporal modulation (flicker perception) perimetry us...

Journal: :The British journal of ophthalmology 2004
G Garhöfer C Zawinka H Resch P Kothy L Schmetterer G T Dorner

BACKGROUND/AIM Stimulation of the retina with flickering light increases retinal arterial and venous diameters in animals and humans, indicating a tight coupling between neural activity and blood flow. The aim of the present study was to investigate whether this response is altered in patients with insulin dependent diabetes mellitus. METHODS 26 patients with diabetes mellitus with no or mild...

2012
Martin Ritt Joanna M. Harazny Christian Ott Ulrike Raff Philipp Bauernschubert Marina Lehmann Georg Michelson Roland E. Schmieder

We hypothesized that the increase of retinal capillary blood flow (RCF) to flicker light exposure is impaired in subjects with arterial hypertension. In 146 nondiabetic untreated male subjects with (n 50) or without (n 96) arterial hypertension, RCF was measured before and after flicker light exposure noninvasively and in vivo using scanning laser Doppler flowmetry. In addition, in a subgroup o...

Journal: :Remote Sensing 2022

The VIIRS day/night band (DNB) high gain stage (HGS) pixel effective dwell time is in the range of 2–3 milliseconds (ms), which about one third flicker cycle present lighting powered by alternating current. Thus, if present, it induces random fluctuations nightly DNB radiances. This results increased variance temporal profiles. A survey characteristics conducted with high-speed camera data coll...

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