Results 51 to 60 of about 6,553 (188)

Formation of Planets around Pulsars

The Astrophysical Journal, 1993
Pulse arrival-time delays PSR 1257+12 suggest the existence of at least two planets in nearly circular orbits around it. In this paper we discuss different scenarios for the formation of planets in circular orbits around pulsars. Among other topics, we look in some detail at wind emission mechanisms that are particularly relevant to the process of ...
M. Banit, M. A. Ruderman, J. Shaham, J. H. Applegate   +3 more
openaire   +1 more source

NiCu/Al2O3 Bimetallic Catalysts for Reductive Amination of Polyether 230: Synergistic Effects of Alloy Formation and Amorphous Support Properties

Journal of Chemistry, Volume 2026, Issue 1, 2026.
The development of efficient and scalable catalysts for polyether amine (PEA) synthesis via reductive amination remains an enduring industrial challenge. In this study, bimetallic NiCu alloys supported on amorphous alumina were rationally designed for the amination of low‐molecular‐weight polyether (PPG‐230).
Hongyan Yu, Majishi Wang, Yuqian Zhang, Zhirong Chen, Lidan He, Hong Yin, Pengfei Gu, Jianfei An, Yifeng Jin, Sohini Basu Roy   +9 more
wiley   +1 more source

Constraints on planet X/Nemesis from Solar System's inner dynamics

, 2009
We put full 3D constraints on a putative planet X by using the dynamics of the inner planets of the solar system. In particular, we compute the mimium distance of X as a function of its heliocentric latitude and longitude for different values of its mass.
Anderson, Babich, Bertotti, Brunini, Brunini, Davis, Deller, Di Stefano, Eichler, Foot, Gaudi, Gomes, Harrison, Hogg, Horner, H��g, Iorio, Jewitt, Khriplovich, Khriplovich, Kowal, L. Iorio, Larsen, Lowell, Lykawka, Matese, Melita, Montenbruck, Muller, Murray, Neugebauer, Pitjeva, Raup, Schwamb, Seto, Silagadze, Standish, S��bastien, Tombaugh, Vandervoort, Whitmire, Zakamska   +41 more
core   +2 more sources

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

Millisecond Pulsars, their Evolution and Applications

, 2017
Millisecond pulsars (MSPs) are short-period pulsars that are distinguished from "normal" pulsars, not only by their short period, but also by their very small spin-down rates and high probability of being in a binary system.
Manchester, R. N.
core   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Very High Angular Resolution Science with the Square Kilometre Array [PDF]

, 2011
Preliminary specifications for the Square Kilometre Array (SKA) call for 25% of the total collecting area of the dish array to be located at distances greater than 180 km from the core, with a maximum baseline of at least 3000 km.
Bailes, Bhat, Damour, Elbaz, Elbaz, Fender, Fender, Gaensler, Garrett, Godfrey, Gou, Greaves, Greaves, Greaves, H. Bignall, Hoare, J. C. A. Miller-Jones, Kramer, L. E. H. Godfrey, L. Harvey-Smith, Liu, M. Johnston-Hollitt, M. Kramer, Natta, Nordhaus, Noutsos, R. Ekers, Reid, Rioja, S. Burke-Spolaor, S. Gulyaev, S. Tingay, Shklovskii, Sigurdsson, Smits, Stairs, Stepanov   +36 more
core   +5 more sources

Massenbegriffe auf dem Prüfstand: Die drei Facetten der Masse

Physik in unserer Zeit, Volume 56, Issue 6, Page 272-280, November 2025.
Masse ist die primäre Eigenschaft, die man physikalischen Körpern zuordnet. Da die Masse verschiedene Rollen übernimmt – so reagiert sie nicht nur auf ein Gravitationsfeld, sie erzeugt auch eines –, müssen diese verschiedenen Rollen und darauf aufbauend die verschiedenen Massenbegriffe genauer analysiert werden.
Eva Hackmann, Claus Lämmerzahl
wiley   +1 more source

A Debris Disk Around An Isolated Young Neutron Star

, 2006
Pulsars are rotating, magnetized neutron stars that are born in supernova explosions following the collapse of the cores of massive stars. If some of the explosion ejecta fails to escape, it may fall back onto the neutron star or it may possess ...
Chakrabarty, Deepto, Kaplan, David L., Wang, Zhongxiang   +2 more
core   +1 more source

Effects in the Anomalistic Period of Celestial Bodies due to a Logarithmic Correction to the Newtonian Gravitational Potential [PDF]

, 2013
We study the motion of a secondary celestial body under the influence of the logarithmic corrected gravitational force of a primary one. This kind of correction was introduced by Fabris et al. (2009). We derive two equations to compute the rate of change
Gkigkitzis, Ioannis, Haranas, Ioannis, Ragos, Omiros   +2 more
core   +3 more sources