Results 61 to 70 of about 22,534,897 (356)
Scientific ReportsHigh-altitude hypoxia can cause gastrointestinal issues and damage the intestinal mucosal barrier, which is crucial for digestion and nutrient absorption. The Notch signaling pathway affects this barrier’s integrity. This study explores the Notch pathway’
Ruhan Jia +8 more
doaj +1 more source
Flight experience with altitude hold and Mach hold autopilots on the YF-12 aircraft at Mach 3 [PDF]
, 1978 The altitude hold mode of the YF-12A airplane was modified to include a high-pass-filtered pitch rate feedback along with optimized inner loop altitude rate proportional and integral gains.
Gilyard, G. B., Smith, J. W.
core +1 more source
Behavioural and physiological adaptations to low-temperature environments in the common frog, Rana temporaria [PDF]
, 2014 <b>Background</b><p></p> Extreme environments can impose strong ecological and evolutionary pressures at a local level. Ectotherms are particularly sensitive to low-temperature environments, which can result in a reduced activity
Biek, Roman +2 more
core +4 more sources
Medical Clinics of North America, 1992 Altitude illness is common and may result in major disruption of travel plans. Visitors to altitude need to be aware of the various health problems they might encounter and how they may be prevented. Self-diagnosis and treatment is the norm in many remote locations.
openaire +2 more sources
Energy Consumption Optimization in Trajectory Planning for Fuel Cell Hybrid Uavs Based On HMPC
Advanced Robotics Research, EarlyView.The endurance limitation of multirotor drones is a critical challenge. This study adopts a hybrid power system of fuel cells and lithium‐ion batteries. Using Nondominated Sorting Genetic Algorithm II, it integrates trajectory planning with energy management optimization.
Xindi Wang +7 more
wiley +1 more source
Collision‐Resilient Winged Drones Enabled by Tensegrity Structures
Advanced Robotics Research, EarlyView.Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui +5 more
wiley +1 more source
Waves and Magnetism in the Solar Atmosphere (WAMIS)
Frontiers in Astronomy and Space Sciences, 2016 Comprehensive measurements of magnetic fields in the solar corona have a long history as an important scientific goal. Besides being crucial to understanding coronal structures and the Sun’s generation of space weather, direct measurements of their ...
Yuan-Kuen eKo +17 more
doaj +1 more source
Enhanced Placental Mitochondrial Respiration in Tibetan Women at High Altitude
Frontiers in Physiology, 2021 Living at high altitudes is extremely challenging as it entails exposure to hypoxia, low temperatures, and high levels of UV radiation. However, the Tibetan population has adapted to such conditions on both a physiological and genetic level over 30,000 ...
Huifang Liu +12 more
doaj +1 more source
Acute High-Altitude Illnesses [PDF]
New England Journal of Medicine, 2013 A 45-year-old healthy man wishes to climb Mount Kilimanjaro (5895 m) in a 5-day period, starting at 1800 m. The results of a recent exercise stress test were normal; he runs 10 km 4 or 5 times per week and finished a marathon in less than 4 hours last year.
Jean-Paul, Richalet +3 more
openaire +7 more sources
Light‐Driven Quadrupedal Walking Biohybrid Robot With Antagonistic Muscle‐Rings and Inclined Joints
Advanced Robotics Research, EarlyView.This work presents a light‐driven quadrupedal walking biohybrid robot powered by antagonistic muscle‐rings that achieve alternating walking gait. Optical training improved reproducibility of cultured muscle tissues, while caffeine treatment enhanced contractile force.
Shotaro Saito +5 more
wiley +1 more source