Results 271 to 280 of about 199,344 (312)

Accelerated response of thermopile pyranometers

Solar Energy, 1976
Tests with a compensating network show that the response of a thermopile pyranometer can be accelerated by a factor of about ten.
B.J. Brinkworth, T.D.R. Hughes
openaire   +1 more source

Ventilation and CO2 response during +Gz acceleration

Respiration Physiology, 1985
During foot-to-head acceleration (+Gz) ventilation increases despite a drop in alveolar PCO2. In order to investigate the underlying mechanisms, we measured ventilation (VE), VO2, VCO2 and PACO2, cardiac output (Q) and mixed venous CO2 concentration (CVCO2) using non-invasive techniques in 5 subjects breathing either air or a gas mixture containing 5 ...
U, Boutellier, R, Arieli, L E, Farhi
openaire   +2 more sources

Cardiovascular responses to acceleration stress: a computer simulation

Proceedings of the IEEE, 1988
Engineering methodology was used to develop a mathematical model of the cardiovascular system which is capable of predicting the effects of acceleration stress on peripheral and central vision. The basic model, previously reported, has been extended to include a simulation of the venous system and a number of additional refinements.
Dov Jaron, Thomas W. Moore, Jing Bai
openaire   +1 more source

Stress and adaptation responses to repeated acute acceleration

American Journal of Physiology-Legacy Content, 1972
Study in which groups of adult male chickens (single-comb white leghorn) were exposed daily to acceleration (centrifugation) of 2 or 3 G for 10 min, 1, 4, 8, 12, 16, and 24 hr (continuously), or 0 time (controls). After approximately five months of this intermittent treatment (training), the birds were exposed to continuous accelerations of the same G ...
R R, Burton, A H, Smith
openaire   +2 more sources

Acceleration Stress and Effects of Propranolol on Cardiovascular Responses

Acta Physiologica Scandinavica, 1974
AbstractHeart rate, arterial pressure and cardiac output were recorded in six physically well‐trained, young male volunteers in the sitting position at normal gravity and at 3 G acting in the head‐seat direction, before and after beta‐adrenergic blockade by propranolol. Studies were performed both at rest and during leg exercise at a load corresponding
H, Bjurstedt, G, Rosenhamer, G, Tydén
openaire   +2 more sources

Modification of the Response to Angular Accelerations by Linear Accelerations

1974
The specialized receptors of the vestibular apparatus provide the animal with information about its motion and its orientation with respect to the gravitational vertical. By evolutionary processes the dynamic responses of this end-organ subserving equilibratory function have been optimized for the environment in which the animal lives (Mayne, 1965 ...
openaire   +1 more source

Effects of acceleration on thermoregulatory responses of unanesthetized rats

Journal of Applied Physiology, 1977
Upon exposure of rats to 2 G environments (achieved by centrifugation), there occurred a rapid decrease in colonic temperature (Tco) followed, after about 50 min, by a slow recovery toward precentrifugation levels. The initial drop in Tco was accompanied by decreases in hypothalamic and spinal cord temperatures and increases in tail temperature (Tta).
C A, Fuller, J M, Horowitz, B A, Horwitz
openaire   +2 more sources

Ocular Counterrolling in Response to Asymmetric Radial Acceleration

Acta Oto-Laryngologica, 1996
The fact that the labyrinths are positioned at approx. 3.5 cm from the head-centric axis leads to the generation of systematic radial acceleratory, or centrifugal, forces during physiological head rotations. Under physiological conditions, the forces exerted on the right and left maculae are generally assumed to be equal and opposite.
A H, Clarke, A, Engelhorn, H, Scherer
openaire   +2 more sources

Vestibular Responses to Bithermal Caloric and Harmonic Acceleration

Annals of Otology, Rhinology & Laryngology, 1978
Vestibulo-oculomotor responses from 33 patients with either peripheral labyrinthine or central pathology were compared using the standardized Fitzgerald-Hallpike bithermal caloric and harmonic accelerations. In numerous cases (40%), patients with normal caloric responses reflected abnormalities in either their phase relationships or labyrinthine ...
J W, Wolfe, E J, Engelken, J W, Olson, C M, Kos   +3 more
openaire   +2 more sources

The cerebrovascular response to experimental lateral head acceleration

Acta Neuropathologica, 1992
A number of microvascular changes, such as the development of astrocyte lucency, increased endothelial pit/vesicle activity, development of crater like lesions, and endothelial microvilli have been reported after injury to the brain. Lateral head acceleration in the non-human primate, however, still provides the best experimental model for human ...
W L, Maxwell, P C, Whitfield, B, Suzen, D I, Graham, J H, Adams, C, Watt, T A, Gennarelli   +6 more
openaire   +2 more sources