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  • Chemistry  (2)
  • Maximum body temperature  (1)
  • 1975-1979  (3)
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  • 1
    ISSN: 1439-6327
    Keywords: Rectal temperature ; Mean body temperature ; Mean skin temperature ; Maximum heart rate ; Maximum body temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty-three male subjects performed submaximal exercise at approximately 80% $$\dot VO_2$$ max on a bicycle ergometer. Rectal temperature, skin temperatures, and heart rate measurements were taken during the exercise and during the corresponding recovery periods. The lag in body temperature (rectal temperature and mean body temperature) responses at the onset of exercise or recovery from exercise was shown in comparison with heart rate. Certain differences existed in the relationship between body temperature and heart rate during the exercise and the recovery period. The correlation coefficient of body temperature with heart rate was high from the 24th min of exercise until the 21st min of the recovery period. The regression equation of post-work rectal temperature on heart rate at moderate work loads (approximately 80% $$\dot VO_2$$ max) in the present study was similar to the equation at light work loads (25∼35% $$\dot VO_2$$ max) for data reported from different laboratories. However, at the termination of exercise the regression equation of rectal temperature on heart rate at light work loads from different laboratories does not agree with the equation of rectal temperature on heart rate at moderate exercise, in the present study. There is good agreement with the equation from the maximum state at a moderate exercise (times of maximum heart rate against maximum body temperature). The correlation coefficients for rectal temperature on heart rate at the maximum state were high. The relationship between body temperature and heart rate at the termination of light exercise is similar to that between these two parameters at the maximum state for moderate exercise.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 47 (1975), S. 61-77 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: When the ozonisation of bulk or suspension poly(vinylchloride) is carried out in tetrachloroethane solution between 0-120°C the molecular weight decreases continuously and the rate of breaking of chains deduced from the intrinsic viscosity variation is constant under isothermal conditions. Whatever the time and temperature of ozonisation may be, at every breaking, β and α chlorinated acid groups are introduced which have been characterized by infrared spectroscopy, high resolution NMR spectroscopy and potentiometric titration in dimethylformamide. Besides these functions, peroxide groups have also been identified and their concentration has been determined for different times and temperatures of ozonisation.This study permits to propose two mechanisms to explain the breaking of chains. The first implies the previous dehydrochlorination of the polymer and the second the formation of unstable peroxides which by decomposition cause the breaking of chains.
    Notes: Quelle que soit la nature du polychlorure de vinyle (masse ou suspension) l'action de l'ozone en milieu homogène dans le tétrachloroéthane provoque la décroissance continue de la masse moléculaire dans le domaine de température 0-120°C et la vitesse de coupure des chaînes déduite des variations de viscosité est constante en conditions isothermes.Quels que soient le temps et la température d'ozonisation, à chaque point de coupure apparaissent des fonctions acides α et β chlorées qui ont été caractérisées par spectroscopie infra-rouge, RMN haute résolution et dosage potentiométrique en milieu diméthylformamide. Outre ces fonctions, des peroxydes ont égé également identifiés dans le polymère et on a suivi leur concentration en fonction des conditions d'ozonisation.Cette étude permet de proposer deux mécanismes pour expliquer la coupure des chaînes, l'un suppose une déhydrochloruration préalable du polymère et l'autre la formation de peroxydes instables qui en se décomposant provoqueraient la coupure des chaînes.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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