Results 41 to 50 of about 752 (114)

On Galileo’s Tallest Column

Mathematical Problems in Engineering, Volume 2015, Issue 1, 2015., 2015
The height at which an unloaded column will fail under its own weight was calculated for first time by Galileo for cylindrical columns. Galileo questioned himself if there exists a shape function for the cross section of the column with which it can attain a greater height than the cylindrical column.
Mariano Vázquez Espí, Jaime Cervera Bravo, Carlos Olmedo Rojas, Reza Jazar   +3 more
wiley   +1 more source

A standard protocol for documenting modern and fossil ichnological data [PDF]

, 2018
© The Palaeontological Association. The collection and dissemination of vertebrate ichnological data is struggling to keep up with techniques that are becoming commonplace in the wider palaeontological field.
Abrahams, Adams, Allen, Avanzini, Avanzini, Bates, Bates, Bates, Bates, Belvedere, Belvedere, Bennett, Bennett, Breithaupt, Castanera, Citton, Davies, Díaz-Martínez, Ellis, Falkingham, Falkingham, Falkingham, Falkingham, Falkingham, Falkingham, Falkingham, Falkingham, Farlow, Fiorillo, Gatesy, Gatesy, Graversen, Haubold, Hitchcock, Klein, Lallensack, Lallensack, Leonardi, Lockley, Lockley, Lomax, Maceo, Mallison, Manning, Manning, Marsicano, Marty, Marty, Marty, Matthews, Matthews, McCrea, Milàn, Milàn, Milàn, Milàn, Milàn, Milàn, Minter, Padian, Padian, Petti, Razzolini, Razzolini, Salisbury, Thulborn, Thulborn, Xing, Xing, Xing   +69 more
core   +4 more sources

Testing the persistence of Carcharodontosauridae (Theropoda) in the Upper Cretaceous of Patagonia based on dental evidence [PDF]

, 2021
The deposits corresponding to the Upper Cretaceous Neuquén and San Jorge Gulf basins from northern and central Patagonia have provided two of the most complete sequences of terrestrial vertebrate faunas of all Gondwanan landmasses.
Canudo, J. I., Casal, G. A., Da Silva Correa, Samuel Aparecido, Dos Santos, D., Juárez Valieri, R. D., Martinelli, Agustín Guillermo, Meso, Jorge Gustavo, Poblete, F., Porfiri, Juan Domingo   +8 more
core   +1 more source

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source

Phylogeny of Allosauroidea (Dinosauria:Theropoda): Comparative analysis and resolution [PDF]

, 2008
Allosauroidea, a clade of large-bodied theropod dinosaurs that ranged from the Middle Jurassic until the Late Cretaceous, has been the subject of extensive phylogenetic study.
Brusatte, S.L., Sereno, P.C.
core   +1 more source

Diet of bird‐like troodontid dinosaurs: synthesis of a contentious clade

Biological Reviews, EarlyView.
ABSTRACT Troodontidae is a clade of small‐to medium‐sized maniraptoran theropods that mainly lived in Laurasia (modern Asia, North America and Europe) during the Jurassic and Cretaceous periods and are believed to have had a variety of diets. The uniqueness of troodontid teeth suggests that they diverged from the typical flesh‐based diet of non‐avian ...
Yui Chi Fan, Case Vincent Miller, Michael Pittman   +2 more
wiley   +1 more source

Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

Papers in Palaeontology, Volume 10, Issue 6, November/December 2024.
Abstract The Lower Cretaceous Wealden Supergroup of southern England yields a diverse assemblage of theropod dinosaurs, its taxa being represented by fragments in addition to some of the most informative associated skeletons of the European Mesozoic. Spinosaurids, neovenatorid allosauroids, tyrannosauroids and dromaeosaurids are among reported Wealden ...
Chris T. Barker, Lucy Handford, Darren Naish, Simon Wills, Christophe Hendrickx, Phil Hadland, Dave Brockhurst, Neil J. Gostling   +7 more
wiley   +1 more source

Observations on the skull of the type specimen of Tyrannosaurus rex Osborn, 1905

All Earth
The skull bones of the type specimen of Tyrannosaurus rex have been undescribed since the early 20th Century. The objectives were to provide a description of the type skull, assess the homology of characters seen in adults and juveniles, and test the ...
Thomas D. Carr
doaj   +1 more source

THE OSTEOLOGY OF ALIORAMUS, A GRACILE AND LONG-SNOUTED TYRANNOSAURID (DINOSAURIA: THEROPODA) FROM THE LATE CRETACEOUS OF MONGOLIA [PDF]

, 2012
Fig. 68: Closeup of right ilium of the holotype specimen of Alioramus altai (IGM 100/1844) in lateral view. Scale bar 5 5 cm. Abbreviations as in figure 66.Published as part of Brusatte, Stephen L., Carr, Thomas D.
Brusatte, Stephen L., Carr, Thomas D., Norell, Mark A.   +2 more
core   +1 more source

The dentition of tyrannosauroid theropods: a review

Discover Geoscience
Tyrannosauroidea is a clade of early-diverging carnivorous coelurosaur theropods known from the Middle Jurassic to Late Cretaceous that includes the eponymous Tyrannosaurus rex and its closest relatives. One of the most notable diagnostic features of the
Carlos A. Hernández-Luna, Christophe Hendrickx, Alejandro Hiram Marín-Leyva, Thomas D. Carr   +3 more
doaj   +1 more source