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السجلات المعروضة 81 -- 90 من 97
Spatio-temporal variation in potential habitats for rare and endangered plants and habitat conservation based on the maximum entropy model
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Elsevier
, 2021 , Article)
Rare and endangered plants (REPs) act as key indicators for species habitat priorities, and can thus be critical in global biodiversity protection work. Human activities and climate change pose great threats to REPs, so ...
The tundra phenology database: More than two decades of tundra phenology responses to climate change
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NRC Research Press
, 2021 , Article)
Observations of changes in phenology have provided some of the strongest signals of the effects of climate change on terrestrial ecosystems. The International Tundra Experiment (ITEX), initiated in the early 1990s, established ...
Polymer-metal oxide composite nanofibers
(
Elsevier
, 2021 , Book chapter)
Extensive studies have been conducted on different kinds of polymers, their composites, and multifunctionalities, depending on their structural features. Metal oxides and their polymer nanocomposites offer technological ...
Ervilia castanea (Mollusca, Bivalvia) populations adversely affected at CO2 seeps in the North Atlantic
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Elsevier B.V.
, 2021 , Article)
Sites with naturally high CO2 conditions provide unique opportunities to forecast the vulnerability of coastal ecosystems to ocean acidification, by studying the biological responses and potential adaptations to this ...
Seismic detection and characterization of a man-made karst analog - A feasibility study
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Society of Exploration Geophysicists
, 2021 , Article)
At the site of a water drainage shaft on the campus of Qatar University that serves as a man-made karst analog, two seismic imaging techniques were adapted to use resonant scattered waves recorded during active-source ...
Comprehensive pore size characterization of Midra shale
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Elsevier B.V.
, 2021 , Article)
Although the Middle East's carbonate reservoirs were the first and most studied rocks in the world, Middle Eastern shale reservoirs are still poorly understood compared with other unconventional formations in the US. We ...
Characterizing fracture toughness using machine learning
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Elsevier B.V.
, 2021 , Article)
The existing models for fracture toughness characterization based on nanoindentations that account for the fracture length are limited to simple (ideal) geometries that are absent in shales. The present study proposes two ...
Long-term assessment of onshore and offshore wind energy potentials of Qatar
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MDPI AG
, 2021 , Article)
Exploitation of conventional energy resources has caused a deliberate increase in the emitted carbon in the atmosphere, which catalyzes global warming trends. This is a matter of concern, especially in Qatar, where fossil ...
Sentinel-2 image transformation methods for mapping oil spill – A case study with Wakashio oil spill in the Indian Ocean, off Mauritius
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Elsevier B.V.
, 2021 , Article)
Although several indices have been constructed and available at the Index database (IDB) for Sentinel-2 satellite to map and study several earth resources, no indices have been developed to map oil spill. We constructed ...
Geochemical characterization and origin of the Cretaceous Sa’di, Khasib, Mishrif, and Nahr Umr Crude Oils in Halfaya Oilfield, Southern Mesopotamian Basin, Iraq
(
Taylor and Francis Ltd.
, 2021 , Article)
A suite of crude oil samples from the Cretaceous reservoirs in Halfaya Oilfield, Southern Iraq were analyzed using organic geochemistry analysis to study their geochemical characterization and origin. High sulfur content ...