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  • 1
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    PIV measurements in a real time controlled model wind turbine wake simulator (2016)
    Institute of Physics
    Details
    Publikationsdatum: 2016-09-01
    Print ISSN: 1742-6588
    Digitale ISSN: 1742-6596
    Thema: Physik
    Publiziert von Institute of Physics
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 2
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    The relationship of chronobiology to sleep schedules and performance demands (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: This review is concerned with how chronobiological results concerning the human circadian timekeeping system ( biological clock'), its response to changes in schedule, and its influence on performance ability can be used to improve shift worker wellbeing, safety and productivity.
    Schlagwort(e): Behavioral Sciences
    Materialart: Work and stress (ISSN 0267-8373); Volume 4; 3; 227-36
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Influence of head-down bed rest on the circadian rhythms of hormones and electrolytes involved in hydroelectrolytic regulation (2001)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: We investigated in six men the impact of a 17-day head-down bed rest (HDBR) on the circadian rhythms of the hormones and electrolytes involved in hydroelectrolytic regulation. This HDBR study was designed to mimic an actual spaceflight. Urine samples were collected at each voiding before, during and after HDBR. Urinary excretion of aldosterone, arginine vasopressin (AVP), cyclic guanosine monophosphate (cGMP), cortisol, electrolytes (Na+ and K+) and creatinine were determined. HDBR resulted in a significant reduction of body mass (P 〈 0.01) and of caloric intake [mean (SEM) 2,778 (37) kcal.24 h(-1) to 2,450 (36) kcal.24 h(-1), where 1 kcal.h(-1) = 1.163 J.s(-1); P〈 0.01]. There was a significant increase in diastolic blood pressure [71.8 (0.7) mmHg vs 75.6 (0.91) mmHg], with no significant changes in either systolic blood pressure or heart rate. The nocturnal hormonal decrease of aldosterone was clearly evident only before and after HDBR, but the day/night difference did not appear during HDBR. The rhythm of K+ excretion was unchanged during HDBR, whereas for Na+ excretion, a large decrease was shown during the night as compared to the day. The circadian rhythm of cortisol persisted. These data suggest that exposure to a 17-day HDBR could induce an exaggeration of the amplitude of the Na+ rhythm and abolition of the aldosterone rhythm.
    Schlagwort(e): Aerospace Medicine
    Materialart: European journal of applied physiology (ISSN 1439-6319); Volume 85; 1-2; 74-81
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Effects of 17 days of head-down bed rest on hydro-electrolytic regulation in men (2001)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Prolonged periods of head-down bed rest (HDBR) are commonly used to mimic the effects of microgravity. HDBR has been shown to produce, as in space, a cephalad redistribution of circulating blood volume with an increase in central blood volume which induces the early adaptations in blood volume regulating hormones. Changes in atrial natriuretic peptide (ANP), arginine vasopressin (AVP), renin activity and aldosterone have been observed. Many reports describe these endocrine adaptations but few investigations of rhythms are in the literature. We proposed to evaluate the circadian rhythms of the hormones and electrolytes involved in the hydro-electrolytic regulation during a HDBR study which was designed to simulate a 17-day spaceflight (Life and Microgravity Spacelab experiment, LMS, NASA).
    Schlagwort(e): Aerospace Medicine
    Materialart: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology (ISSN 1077-9248); Volume 8; 1; P121-2
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Commercialization of the land remote sensing system: An examination of mechanisms and issues (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: In September 1982 the Secretary of Commerce was authorized (by Title II of H.R. 5890 of the 97th Congress) to plan and provide for the management and operation of the civil land remote sensing satellite systems, to provide for user fees, and to plan for the transfer of the ownership and operation of future civil operational land remote sensing satellite systems to the private sector. As part of the planning for transfer, a number of approaches were to be compared including wholly private ownership and operation of the system by an entity competitively selected, mixed government/private ownership and operation, and a legislatively-chartered privately-owned corporation. The results of an analysis and comparison of a limited number of financial and organizational approaches for either transfer of the ownership and operation of the civil operational land remote sensing program to the private sector or government retention are presented.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E86-10008 , NASA-CR-176337 , NAS 1.26:176337 , ECON-82-175
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    A sleep diary and questionnaire study of naturally short sleepers (2001)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Whereas most people require more than 6 h of sleep to feel well rested, there appears to be a group of people who can function well on between 3 and 6 h of sleep. The aims of the present study were to compare 12 naturally short (3-6 h) sleepers (9 males 3 females, mean age 39.6 years, SD age 10.1 years) recruited by a media publicity campaign with age, gender and chronotype matched medium length (7-8.5 h) sleepers on various measures. Measurement instruments included diaries and questionnaires to assess sleep duration and timing, as well as questionnaire assessments of sleep pathology, morningness-eveningness, extroversion, neuroticism, pathological daytime sleepiness, subclinical hypomania, optimism, depressive symptoms, exercise, and work habits. Few measures showed reliable differences between naturally short sleepers and controls except the obvious ones related to sleep duration. There was, however, some evidence for subclinical hypomanic symptoms in naturally short sleepers.
    Schlagwort(e): Life Sciences (General)
    Materialart: Journal of sleep research (ISSN 0962-1105); 10; 3; 173-9
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Sleep deprivation influences some but not all processes of supervisory attention (2003)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Does one night of sleep deprivation alter processes of supervisory attention in general or only a specific subset of such processes? Twenty college-aged volunteers, half female, performed a choice reaction time task. A cue indicated that compatible (e.g., right button, right-pointing arrow) or incompatible (e.g., left button, right-pointing arrow) responses were to be given to a stimulus that followed 50 or 500 ms later. The paradigm assessed response inhibition, task-shifting skill, and task strategy-processes inherent in supervisory attention. Performance, along with heart rate, was assessed for 12 hr following normal sleep or a night of complete sleep deprivation. Sleep deprivation altered neither preparation for task shifting nor response inhibition. The ability to use preparatory bias to speed performance did decrease with sleep deprivation. Sleep deprivation appears to selectively affect this supervisory attention process, which is perceived as an active effort to cope with a challenging task.
    Schlagwort(e): Life Sciences (General)
    Materialart: Psychological science : a journal of the American Psychological Society / APS (ISSN 0956-7976); 14; 5; 473-9
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    The Pittsburgh Sleep Diary (1994)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Increasingly, there is a need in both research and clinical practice to document and quantify sleep and waking behaviors in a comprehensive manner. The Pittsburgh Sleep Diary (PghSD) is an instrument with separate components to be completed at bedtime and waketime. Bedtime components relate to the events of the day preceding the sleep, waketime components to the sleep period just completed. Two-week PghSD data is presented from 234 different subjects, comprising 96 healthy young middle-aged controls, 37 older men, 44 older women, 29 young adult controls and 28 sleep disorders patients in order to demonstrate the usefulness, validity and reliability of various measures from the instrument. Comparisons are made with polysomnographic and actigraphic sleep measures, as well as personality and circadian type questionnaires. The instrument was shown to have sensitivity in detecting differences due to weekends, age, gender, personality and circadian type, and validity in agreeing with actigraphic estimates of sleep timing and quality. Over a 12-31 month delay, PghSD measures of both sleep timing and sleep quality showed correlations between 0.56 and 0.81 (n = 39, P 〈 0.001).
    Schlagwort(e): Life Sciences (General)
    Materialart: Journal of sleep research (ISSN 0962-1105); 3; 111-20
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Decreased human circadian pacemaker influence after 100 days in space: a case study (2001)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: OBJECTIVE: The objectives of this study were (1) to assess the circadian rhythms and sleep of a healthy, 42-year-old male astronaut experiencing microgravity (weightlessness) for nearly 5 months while living aboard Space Station Mir as it orbited Earth and (2) to determine the effects of prolonged space flight on the endogenous circadian pacemaker, as indicated by oral temperature and subjective alertness rhythms, and their ramifications for sleep, alertness, and performance. METHODS: For three 12- to 14-day blocks of time (spread throughout the mission), oral temperatures were taken and subjective alertness was self-rated five times per day. Sleep diaries and performance tests were also completed daily during each block. RESULTS: Examination of the subject's circadian alertness and oral temperature rhythms suggested that the endogenous circadian pacemaker seemed to function quite well up to 90 days in space. Thereafter (on days 110-122), the influence of the endogenous circadian pacemaker on oral temperature and subjective alertness circadian rhythms was considerably weakened, with consequent disruptions in sleep. CONCLUSIONS: Space missions lasting more than 3 months might result in diminished circadian pacemaker influence in astronauts, leading to eventual sleep problems.
    Schlagwort(e): Life Sciences (General)
    Materialart: Psychosomatic medicine (ISSN 0033-3174); 63; 6; 881-5
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    Maintaining safety and high performance on shiftwork (1996)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: This review of the shiftwork area focuses on aspects of safety and productivity. It discusses the situations in which shiftworker performance is critical, the types of problem that can develop and the reasons why shiftworker performance can be impaired. The review ends with a discnssion of the various advantages and disadvantages of several shift rotation systems, and of other possible solutions to the problem.
    Schlagwort(e): Aerospace Medicine
    Materialart: Applied ergonomics (ISSN 0003-6870); 27; 1; 17-23
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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