Results 131 to 140 of about 793,102 (405)
Australian medical imaging and world war one
Journal of Medical Radiation Sciences, Volume 69, Issue 4, Page 510-517, December 2022., 2022 World War One was a decisive moment in the development of the the radiography profession. This paper details the environment of that time, describes our professions soldier pioneers and their daily challenges. Abstract Twenty years after the birth of medical imaging from Röntgen's 1895 discovery, military authorities understood the advantage of ...
Luke C. Barclay, Giovanni Mandarano
wiley +1 more source
Physicists and the 1945 Decision to Drop the Bomb [PDF]
CERNCour.42N9:28739,2002, 2002 In 1943 fear that the German war machine might use atomic bombs was abating and among physicists another fear was taking its place - that of a postwar nuclear arms race with worldwide proliferation of nuclear weapons. Manhattan Project scientists and engineers began to discuss uses of nuclear energy in the postwar world.
arxiv
Early synapsids neurosensory diversity revealed by CT and synchrotron scanning
The Anatomical Record, EarlyView.Abstract Non‐mammaliaform synapsids (NMS) represent the closest relatives of today's mammals among the early amniotes. Exploring their brain and nervous system is key to understanding how mammals evolved. Here, using CT and Synchrotron scanning, we document for the first time three extreme cases of neurosensory and behavioral adaptations that probe ...
J. Benoit +6 more
wiley +1 more source
Persistent Multi-Agent Search and Tracking with Flight Endurance Constraints
Robotics, 2018 A large group of small, limited endurance autonomous vehicles working cooperatively may be more effective in target search and track operations when compared with a long endurance vehicle.
John J. Gainer Jr. +3 more
doaj +1 more source
The B61-based "Robust Nuclear Earth Penetrator:" Clever retrofit or headway towards fourth-generation nuclear weapons? [PDF]
arXiv, 2005 It is scientifically and technically possible to build an earth penetrating device that could bury a B61-7 warhead 30 meters into concrete, or 150 meters into earth, before detonating it. The device (based on knowledge and technology that are available since 50 years) would however be large and cumbersome.
arxiv
II.—On some Egyptian bronze weapons in the collections of John Evans, Esq., and the British Museum [PDF]
, 1892 E. A. Wallis Budge
openalex +1 more source
Morphological diversity of saber‐tooth upper canines and its functional implications
The Anatomical Record, EarlyView.Abstract Elongated upper canine teeth, commonly known as saber‐teeth, have evolved three times within the sub‐order Feliformia. The species that wielded them flourished throughout the Cenozoic and have historically been separated into two morphological groups: the dirk‐tooths with longer, flatter canines, and the scimitar‐tooths with shorter, serrated ...
Caitlin D. Shelbourne +1 more
wiley +1 more source
Modeling, Trim Analysis, and Trajectory Control of a Micro-Quadrotor with Wings
Drones, 2018 This paper presents the modeling, control design, and efficiency analysis of a micro-quadrotor aerial vehicle with airfoils. We derive the equations of motion for a micro-quadrotor (length 0.15 m and mass 0.03 kg) outfitted with two symmetric airfoils ...
Jeremy Dawkins, Levi DeVries
doaj +1 more source
Fourth Generation Nuclear Weapons: Military effectiveness and collateral effects [PDF]
arXiv, 2005 The paper begins with a general introduction and update to Fourth Generation Nuclear Weapons (FGNW), and then addresses some particularly important military aspects on which there has been only limited public discussion so far. These aspects concern the unique military characteristics of FGNWs which make them radically different from both nuclear ...
arxiv
Hypercanines: Not just for sabertooths
The Anatomical Record, EarlyView.Abstract Hypercanines are here defined as hypertrophied caniniform teeth, that is, canine teeth that are elongated to serve specific functions in different clades of mammals and their synapsid ancestors. This article presents an overview of the occurrence of hypercanines, their growth, and their function across a broad range of clades.
Lars Werdelin
wiley +1 more source