Results 171 to 180 of about 815,050 (359)

Wetlands as environments of early human occupation: A new classification for freshwater palaeowetlands

open access: yesThe Depositional Record, EarlyView.
A new classification for inland freshwater palaeowetlands to be used in the field or core laboratory by sedimentologists, providing examples from the Guadix Basin (southern Spain). Abstract Present wetlands have proven to be delicate, biodiverse ecosystems, that are natural sinks for CO2 and act as good indicators for climate changes.
S. Pla‐Pueyo   +1 more
wiley   +1 more source

Nature, origin and significance of a clayey cave deposit: Relationship between karst and Oligocene/Miocene tephra (NW Dinarides)

open access: yesThe Depositional Record, EarlyView.
A limestone cave in the NW Dinarides exhibits an anomalous presence of montmorillonite clay, not commonly found in surrounding caves, posing questions about its origin and age. Analysis reveals a composition similar to weathered tephra from the Smrekovec Volcanic Complex, suggesting transport by north‐east winds.
Nadja Zupan Hajna   +12 more
wiley   +1 more source

Results from flight and simulator studies of a Mach 3 cruise longitudinal autopilot [PDF]

open access: yes
At Mach numbers of approximately 3.0 and altitudes greater than 21,300 meters, the original altitude and Mach hold modes of the YF-12 autopilot produced aircraft excursions that were erratic or divergent, or both.
Gilyard, G. B., Smith, J. W.
core   +1 more source

Exploring the best way for UAV visual localization under Low-altitude Multi-view Observation Condition: a Benchmark [PDF]

open access: yesarXiv
Absolute Visual Localization (AVL) enables Unmanned Aerial Vehicle (UAV) to determine its position in GNSS-denied environments by establishing geometric relationships between UAV images and geo-tagged reference maps. While many previous works have achieved AVL with image retrieval and matching techniques, research in low-altitude multi-view scenarios ...
arxiv  

Some Effects of High-altitude Climbing [PDF]

open access: green, 1955
Dennis Matthews   +4 more
openalex   +1 more source

Annual Banned‐Substance Review 17th Edition—Analytical Approaches in Human Sports Drug Testing 2023/2024

open access: yesDrug Testing and Analysis, EarlyView.
Scenarios of drug exposure and administration as well as detection assays for drugs and methods of sports doping published between 2023 and 2024 are critically reviewed and evaluated in context with the Prohibited List 2024 as established by the World Anti‐Doping Agency.
Mario  Thevis   +2 more
wiley   +1 more source

Impact of Menstrual Cycle and Oral Contraceptives on Haematological and Inflammatory Biomarkers in Highly Trained Female Athletes

open access: yesDrug Testing and Analysis, EarlyView.
In highly trained female athletes, haematological and inflammatory biomarkers were found to be independent of menstrual cycle phase, but oral contraceptive use increased transferrin, reticulocyte count and triglycerides and decreased interleukin‐6.
Katia Collomp   +12 more
wiley   +1 more source

Tailcone on orbiter altitude attainable at the maximum ALT interface airspeed [PDF]

open access: yes
A preflight analysis performed for verification of the ALT mated vehicle incidence angle which maximizes the post separation altitude attainment by the orbiter at the maximum approach and landing test (ALT) interface airspeed (300 KEAS) is discussed.
Glenn, G. M.
core   +1 more source

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