نتایج جستجو برای: high altitudes
تعداد نتایج: 2061974 فیلتر نتایج به سال:
To advance our understanding of the effect of wave-particle interactions on ion outflows in the polar wind region and the resulting ion heating and escape from low altitudes to higher altitudes, we carried out a comparison between polar wind simulations obtained using Barghouthi model with corresponding observations obtained from different satellites. The Barghouthi model describes O and H outf...
Plastic responses to temperature during embryonic development are common in ectotherms, but their evolutionary relevance is poorly understood. Using a combination of field and laboratory approaches, we demonstrate altitudinal divergence in the strength of effects of maternal thermal opportunity on offspring birth date and body mass in a live-bearing lizard (Niveoscincus ocellatus). Poor thermal...
Little is known about the ocular and cerebral blood flow during exposure to increasingly hypoxic conditions at high altitudes. There is evidence that an increase in cerebral blood flow resulting from altered autoregulation constitutes a risk factor for acute mountain sickness (AMS) and high-altitude cerebral edema (HACE) by leading to capillary overperfusion and vasogenic cerebral edema. The re...
Altitude exposure has long been recognized as a cardiac stress. Early accounts of alpine climbs mention a diagnosis of “cardiac fatigue” based on tachycardia, palpitations, shortness of breath, and chest percussion (fonendoscopy) of enlarged hearts (1). Heart failure syndromes have been reported at high altitudes under various names including brisket disease in cattle brought to high-altitude p...
High-altitude environments present a range of biochemical and physiological challenges for organisms through decreases in oxygen, pressure, and temperature relative to lowland habitats. Protein-level adaptations to hypoxic high-altitude conditions have been identified in multiple terrestrial endotherms; however, comparable adaptations in aquatic ectotherms, such as fishes, have not been as exte...
Electron beam experiments on the nearly geosynchronous P78—2 satellite conducted in 1979 resulted in observations of intense radiation near the local electron gyrofrequency. These signals resembled naturally occuring fCe waves during the same period. The amplitude of the stimulated waves depended upon beam parameters. During 50 eV beam operations, current levels of 10 pA produced strong emissio...
Because of several advantages over traditional ceramic insulators, polymeric insulators are gaining popularity in electrical power transmission and distribution systems as outdoor insulation. However, being organic in nature, these insulators degrade in outdoor environment and their lifeexpectancy needs to be assessed in the environment prevailing at potential sites of outdoor installation. For...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید