Results 81 to 90 of about 37,605 (307)

Laser In Situ U–Pb Isotope Dating of Carbonate Rocks in Weijia Guyot in the Western Pacific Ocean and Its Geological Significance

open access: yesJournal of Marine Science and Engineering
Shallow-water carbonate rocks constitute a crucial component of large guyots, arising in distinct environments and harboring valuable insights into the evolutionary stages of seamount islands as well as the tectonic conditions of the underlying oceanic ...
Zhenquan Wei   +5 more
doaj   +1 more source

Mineralogy, geochemistry, petrography, and depositional environment of Gebel El-Qurn, Early Eocene, West Luxor, South Egypt

open access: yesBulletin of the National Research Centre, 2018
Background Luxor represented the modern Egyptian city that occupies the site of ancient Thebes. Thebes Mountain on the West Bank of the Nile, opposite the town of Luxor, is among the most famous historical sites of the world.
Esmat A. Abou El-Anwar   +2 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

open access: yesAdvanced 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

Sedimentology of the Mid-Visean limestones of the southern part of the Askrigg Block, North Yorkshire

open access: yes, 1984
The earliest Carboniferous deposits, resting with profound unconformity on Lower Palaeozoic rocks, have been mapped across their entire outcrop area on the Askrigg Block.
Scott, Gillian
core  

3D Printing of Soft Robotic Systems: Advances in Fabrication Strategies and Future Trends

open access: yesAdvanced Robotics Research, EarlyView.
Collectively, this review systematically examines 3D‐printed soft robotics, encompassing material selections, function integration, and manufacturing methodologies. Meanwhile, fabrication strategies are analyzed in order of increasing complexity, highlighting persistent challenges with proposed solutions.
Changjiang Liu   +5 more
wiley   +1 more source

Corals and Reef‐Dwelling Fish Regulate Carbon Storage and Cycling Processes in Coral Reef Ecosystems

open access: yesAdvanced Science, EarlyView.
Coral reefs are biodiversity hotspots, yet their role in carbon storage and cycling remains poorly understood. Using field surveys and modeling in the South China Sea, we reveal the overlooked potential of carbon storage in reef ecosystems and how reef fish, corals, and surface sediment jointly shape reef carbon reservoirs.
Yiting Chen   +8 more
wiley   +1 more source

Determination of Iodine in Carbonate Rocks by ICP-SFMS with NH4HF2 Digestion

open access: yesYankuang ceshi
Iodine in carbonate rocks is crucial for reconstructing the redox conditions of the ancient marine environment and tracing the sources of ore-forming fluids.
Tao HE   +4 more
doaj   +1 more source

SAG foam flooding in carbonate rocks

open access: yesJournal of Petroleum Science and Engineering, 2017
Abstract Foam is used in gas-injection EOR processes to reduce the mobility of gas, resulting in greater volumetric sweep. SAG (Surfactant Alternating Gas) is a preferred method of injection as it results in greater injectivity in the field, but designing a successful process requires knowledge of foaming performance at very high foam qualities (gas ...
Boeije, C.S. (author)   +1 more
openaire   +5 more sources

Lymphoid‐Tissue‐on‐Chip Recapitulates Human Antibody Responses In Vitro

open access: yesAdvanced Science, EarlyView.
The presented lymphoid‐tissue‐on‐chip system allows culture of primary human tonsil cells at organotypic high density under perfusion for up to 4 weeks, emulates immune response to soluble vaccines and vaccination via peripheral antigen‐presenting cells and represents a useful tool to assess cellular interactions during homeostasis, immune responses ...
Claudia Teufel   +15 more
wiley   +1 more source

Carbonate Rock Physical Property Parameter Substitution Method Based on Rock Physics Models

open access: yesCT Lilun yu yingyong yanjiu
The physical properties of carbonate rocks play a crucial role in the exploration and development of oil and gas. Carbonate rocks are characterized by multiple types of porosity, and the complex porosity types result in a highly discrete relationship ...
Lingbo MA   +3 more
doaj   +1 more source

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