36,010 research outputs found

    Acute sleep deprivation induces a local brain transfer information increase in the frontal cortex in a widespread decrease context

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    Sleep deprivation (SD) has adverse effects on mental and physical health, affecting the cognitive abilities and emotional states. Specifically, cognitive functions and alertness are known to decrease after SD. The aim of this work was to identify the directional information transfer after SD on scalp EEG signals using transfer entropy (TE). Using a robust methodology based on EEG recordings of 18 volunteers deprived from sleep for 36 h, TE and spectral analysis were performed to characterize EEG data acquired every 2 h. Correlation between connectivity measures and subjective somnolence was assessed. In general, TE showed medium-and long-range significant decreases originated at the occipital areas and directed towards different regions, which could be interpreted as the transfer of predictive information from parieto-occipital activity to the rest of the head. Simultaneously, short-range increases were obtained for the frontal areas, following a consistent and robust time course with significant maps after 20 h of sleep deprivation. Changes during sleep deprivation in brain network were measured effectively by TE, which showed increased local connectivity and diminished global integration. TE is an objective measure that could be used as a potential measure of sleep pressure and somnolence with the additional property of directed relationships.Postprint (published version

    Design of a Charge Pump-Based Body Bias Generator for FDSOI Circuits

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    The technique of Body Bias to control threshold voltage is especially suited for FDSOI technology. Given very low voltage energy sources, it is interesting to compensate the associated loss of speed by applying on-chip generated forward body bias (FBB). There are several challenges involved in the use of this new technology with such low input voltages.Electronics circuits powered at near-threshold voltages (ultra-low voltage designs) are desirable for their low power consumption. However, the performance at such voltage supply is degraded. The application of forward body bias to the circuit can counteract the performance loss. FDSOI is a suitable technology to these techniques, due to its high range of body bias voltages. To generate that body bias voltages, positive and negative, charge pumps circuits are designed to be integrated on the chip. This thesis studies the main challenges on the design of such circuits operating at 300 mV to reach voltages of ± 1 V with power consumption lower than 1 µW and how to model it for layout process. In addition, a control circuit is also designed to provide different intermediate body bias voltage

    Diario oficial del Ministerio de Marina: Año LXV Número 218 - 1972 septiembre 22

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    Reverse caption reads: "Stormwater drain, Park Heights Avenue, Baltimore, Maryland, project # 56, photo # 15, April 14, 1936.

    Diario oficial del Ministerio de Marina: Año XXXIX Número 247 - 1946 noviembre 6

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    Reverse caption reads: "Quarrying stone for street improvements. Danger of falling tree. Safety Representative recommended removal of tree or keeping W.P.A. workers out of this part of quarry. Funkstown, Washington County, Maryland, project # 48, photo # 3, May 21, 1936.

    Diario oficial del Ministerio de Marina: Año LXV Número 170 - 1972 julio 27

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    Reverse caption reads: "Storm drain, Park Heights Avenue, Baltimore, Maryland, project # 56, photo # 23, August 27, 1936.

    Lefty Driesell holding a "1985 NCAA Final 16" basketball

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    Charles "Lefty" Driesell in his office in practice clothes, holding a basketball reading "1985 NCAA Final 16," 1985

    Letter to Geary Eppley from Harry Clifton Byrd, September 12, 1945

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    Letter to Geary Eppley from Harry Clifton Byrd regarding Eppley's return to campus following World War II, September 12, 1945

    Brooke Bendler swings, University of Maryland women's golf, circa 2000

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    University of Maryland women's golfer Brooke Bendler swinging, circa 2000

    Construction of Byrd Stadium, 1 September 1950

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    Picture of the construction of Byrd Stadium with a crane and a truck in the foreground, 1 September 1950

    Chris Weller coaching, 1994

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    University of Maryland women's basketball coach Chris Weller points and shouts from courtside during a game in 1994
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