Results 41 to 50 of about 157,869 (299)

The significance of Anomalocaris and other Radiodonta for understanding paleoecology and evolution during the Cambrian explosion

Frontiers in Earth Science, 2023
One of the most widespread and diverse animal groups of the Cambrian Explosion is a clade of stem lineage arthropods known as Radiodonta, which lived exclusively in the early Paleozoic.
Gaëtan J.-M. Potin, Allison C. Daley
doaj   +1 more source

Burmese amber fossils bridge the gap in the Cretaceous record of polypod ferns [PDF]

, 2016
publisher: Elsevier articletitle: Burmese amber fossils bridge the gap in the Cretaceous record of polypod ferns journaltitle: Perspectives in Plant Ecology, Evolution and Systematics articlelink: http://dx.doi.org/10.1016/j.ppees.2016.01.003 ...
Alexander R. Schmidt, Barden, Bell, Benton, Benton, Cardinal, Caspary, Christenhusz, Coiffard, Collinson, Collinson, Cruickshank, Darriba, Drummond, Feldberg, Goeppert, Grimaldi, Guindon, Gómez, Harald Schneider, Hasebe, Hedenäs, Heinrichs, Heinrichs, Heinrichs, Heinrichs, Hu, Jochen Heinrichs, Kramer, Kvaček, Lehtonen, Lehtonen, Lloyd, Lovis, Lóriga, Maddison, Magallón, Magallón, Mays, Mendes, Meredith, Mohr, Nagalingum, Nagalingum, Parham, Poinar, Poinar, Pérez-de la Fuente, Rambaut, Rambaut, Ren, Rothwell, Schmidt, Schmidt, Schneider, Schneider, Schneider, Schneider, Schneider, Schuettpelz, Schuettpelz, Shi, Skog, Smith, Smith, Smith, Smith, Smith, Tidwell, Tryon, van Konijnenburg-van Cittert, Vera, Vermeij, Villarreal, Wing, Zeng   +75 more
core   +1 more source

Hydrogen‐Assisted Fracture of Iron‐Based Fe–Ni–Al Alloys

Advanced Engineering Materials, EarlyView.
Principal relations and fracture mechanisms of single‐phase and precipitate‐strengthened Fe–Ni–Al alloys subjected to prior electrochemical hydrogen charging are identified. The mechanisms of hydrogen effect on strength and microhardness are discussed, including hydrogen‐induced increase in microhardness and the role of hydrogen in fracture behavior ...
Nataliya Yadzhak, Olha Zvirko, Rostyslav Leshchak, Hryhoriy Nykyforchyn   +3 more
wiley   +1 more source

Saiga fossils in the Southern-Lower Volga of Astrakhan, Russia [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2014
Conservation of declining migratory species is a challenging task, as the factors that may have determined their past distribution may not determine their extant and future distribution.
Golovachev Mikhail Vladimirovich, Lozovskaya Marina Viacheslavovna, Akbar Hossain, Matveev Andrey Viktorovich   +3 more
doaj  

High-energy synchrotron-radiation-based X-ray micro-tomography enables non-destructive and micro-scale palaeohistological assessment of macro-scale fossil dinosaur bones

Journal of Synchrotron Radiation, 2023
Palaeohistological analysis has numerous applications in understanding the palaeobiology of extinct dinosaurs. Recent developments of synchrotron-radiation-based X-ray micro-tomography (SXMT) have allowed the non-destructive assessment of ...
Takuya Imai, Soki Hattori, Kentaro Uesugi, Masato Hoshino   +3 more
doaj   +1 more source

Crossed Tracks: Mesolimulus, Archaeopteryx, and the Nature of Fossils [PDF]

, 2019
Organisms leave a variety of traces in the fossil record. Among these traces, vertebrate and invertebrate paleontologists conventionally recognize a distinction between the remains of an organism’s phenotype (body fossils) and the remains of an organism ...
Finkelman, Leonard
core   +1 more source

Clustering Fossils from the Early Universe [PDF]

, 2012
Many inflationary theories introduce new scalar, vector, or tensor degrees of freedom that may then affect the generation of primordial density perturbations.
Jeong, Donghui, Kamionkowski, Marc
core   +2 more sources

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

How to Recognize Mosses from Extant Groups among Paleozoic and Mesozoic Fossils

Diversity
This paper describes a range of Paleozoic and Mesozoic mosses and assesses how far they can be referred to extant taxa at the family, ordinal, or class levels.
Michael S. Ignatov, Tatyana V. Voronkova, Ulyana N. Spirina, Svetlana V. Polevova   +3 more
doaj   +1 more source

The fossilized birth-death model for the analysis of stratigraphic range data under different speciation concepts [PDF]

, 2018
A birth-death-sampling model gives rise to phylogenetic trees with samples from the past and the present. Interpreting "birth" as branching speciation, "death" as extinction, and "sampling" as fossil preservation and recovery, this model -- also referred
Drummond, Alexei, Gavryushkina, Alexandra, Heath, Tracy, Heath, Tracy, Stadler, Tanja, Warnock, Rachel   +5 more
core   +4 more sources