Results 121 to 130 of about 169 (169)

Influence of a Standard Heat Treatment on the Microstructure and Properties of Inconel X‐750 Produced by Laser Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Ni‐base superalloys produced using additive manufacturing (AM) have a different response to heat treatments when compared to their conventional counterparts. Due to such unpredictability, various alloys with industrial interest are currently overlooked in most prior AM research.
Guilherme Maziero Volpato, Adriano de Souza Pinto Pereira, Steffen Neumeier, Dachamir Hotza, Mathias Göken, Ulrich Tetzlaff, Márcio Celso Fredel   +6 more
wiley   +1 more source

A Simulative Approach for the Prediction of Mesoscale Residual Stress Fields in Solution‐Strengthened Ferritic Ductile Iron

Advanced Engineering Materials, EarlyView.
This study presents a 3D representative volume element‐based simulation approach to predict mesoscopic residual stress and strain fields in silicon solid solution‐strengthened ductile cast iron. By modeling phase transformation kinetics with an enhanced Johnson–Mehl–Avrami–Kolmogorov model, the effects of varying cooling rates on residual stresses are ...
Lutz Horbach, Oliver Schenk, Valérian Iss, Ali Rajaei, Jiali Zhang, Felix Weber, Christoph Broeckmann   +6 more
wiley   +1 more source

Development of Aluminum Scandium Alloys for Hydrogen Storage Valves

Advanced Engineering Materials, EarlyView.
Different aluminum alloy series and various aluminum‐scandium alloys with differing Sc and Zr levels are evaluated for use in hydrogen storage valve production. The alloys undergo hardness testing, optical microscopy, and tensile strength analysis, with hardening behavior studied under varying conditions.
Francisco García‐Moreno, Tillmann Robert Neu, Markus Eberl, Paul Hans Kamm, Hans‐Wolfgang Seeliger   +4 more
wiley   +1 more source

Multimaterial Approach to Improve the Mechanical Properties of a Novel Modified Auxetic Reentrant Honeycomb Structure

Advanced Engineering Materials, EarlyView.
A multimaterial approach is introduced to improve upon auxetic structures by combining two different polymers into the same reentrant honeycomb structure via additive manufacturing. The deformation behavior as well as the resulting Poisson's ratio are thereby improved significantly.
Alexander Engel, Oraib Al‐Ketan, Anne Jung   +2 more
wiley   +1 more source

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The Near-Earth Object Population

Icarus, 2000
We examine the dynamics of a sample of 117 near-Earth objects (NEOs) over a time scale of 60 Myr. We find that while 10–20% end their lifetimes by striking a terrestrial planet (usually Venus or Earth), more than half end their lives in a Sun-grazing state, and about 15% are ejected from the Solar System.
Patrick Michel, Christiane Froeschlé, Brett Gladman   +2 more
openaire   +2 more sources

Distribution of the near-earth objects

Solar System Research, 2011
This paper analyzes the distribution of the orbits of near-Earth minor bodies from the data on more than 7500 objects. The distribution of large near-Earth objects (NEOs) with absolute magnitudes of H < 18 is generally consistent with the earlier predictions (Bottke et al., 2002; Stuart, 2003), although we have revealed a previously undetected maximum ...
Boris Shustov, S. A. Naroenkov, V. V. Emel’yanenko   +2 more
openaire   +2 more sources

INEO—Imaging of near-Earth objects

Acta Astronautica, 1994
Abstract INEO is a program of four explorer flyby missions for imaging near-Earth objects by means of small spin stabilized spacecrafts. A low-cost approach is achieved by using existing hardware and available scientific instrumentation. For the first mission the payload consists of the flight space model of the Halley multicolour camera and three ...
Iglseder, H. (1), Arens-Fischer, W. (1), Keller, H.U. (2), Arnold, G., Callies, R. (3), Fick, M. (3), Glaßmeier, K.H. (4), Hirsch, H., Rath, H.J: (1), Hoffmann, M. (5), Kührt, E., Lorenz, E., Thomas, N. (6), Wäsch, R.   +13 more
openaire   +3 more sources

Near-Earth Objects

2014
Asteroids and comets probably contributed significantly to the delivery of water and organic materials to the early Earth necessary for the development of life. However, later impacts of near-Earth objects almost certainly played a role in mass extinctions and evolution.
Alan W. Harris, Line Drube, Lucy A. McFadden, Richard P. Binzel   +3 more
openaire   +2 more sources

Physical characterization of the near-Earth object population

The European Physical Journal Plus, 2017
The Near-Earth Object (NEO) population, being the remnants of the building blocks that originally formed our solar system, allows us to understand the initial conditions that were present in the protosolar nebula. Its investigation can provide crucial information on the origin and early evolution of the solar system, and shed light on the delivery of ...
Ieva, S., Dotto, E., Mazzotta Epifani, E., Perna, D., Perozzi, E., Micheli, M.   +5 more
openaire   +3 more sources

The population of near-Earth objects discovered by Spacewatch [PDF]

Earth, Moon, and Planets, 1996
In the past three years the Spacewatch program at the University of Arizona’s Lunar and Planetary Laboratory has discovered ~45% of the new Earth Approaching asteroids and found evidence for an unheralded population of small (~10m) objects in the inner solar system.
Tom Gehrels, Robert Jedicke
openaire   +1 more source