Results 61 to 70 of about 134,584 (266)

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, EarlyView.
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

Pulsar Dreams

AIP Conference Proceedings, 2008
I share a few reminiscences and observations of 40 years of Pulsars.
Jonathan Arons, C. Bassa, Z. Wang, A. Cumming, V. M. Kaspi   +4 more
openaire   +2 more sources

X-ray Pulsar Signal Denoising Based on Variational Mode Decomposition

Entropy, 2021
Pulsars, especially X-ray pulsars detectable for small-size detectors, are highly accurate natural clocks suggesting potential applications such as interplanetary navigation control.
Qiang Chen, Yong Zhao, Lixia Yan
doaj   +1 more source

Development of a pulsar-based timescale [PDF]

, 2012
Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in international atomic timescales.
Bailes, M., Bhat, N. D. R., Burke-Spolaor, S., Champion, D., Chaudhary, A., Chen, D., Coles, W., Hobbs, G., Hotan, A., Keith, M. J., Khoo, J., Kocz, J., Levin, Y., Manchester, R. N., Oslowski, S., Preisig, B., Ravi, V., Reynolds, J. E., Sarkissian, J., Shannon, R. M., van Straten, W., Verbiest, J. P. W., Yardley, D., You, X. P.   +23 more
core   +4 more sources

A new green synthesis approach using sodium palmitate in the synthesis of a Ni/Al2O3 catalyst for CO2 methanation

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract CO2 methanation with Ni/Al2O3 catalysts is a key technology for converting CO2 emissions into sustainable methane. However, conventional impregnation synthesis often results in poor nickel dispersion and in the emission of gaseous NOx species.
Anderson F. C. Silva, Eduardo L. de Barros Neto, Bruna R. de Vasconcelos   +2 more
wiley   +1 more source

Quark Deconfinement in Rotating Neutron Stars

Universe, 2017
In this paper, we use a three flavor non-local Nambu–Jona-Lasinio (NJL) model, an improved effective model of Quantum Chromodynamics (QCD) at low energies, to investigate the existence of deconfined quarks in the cores of neutron stars.
Richard D. Mellinger, Fridolin Weber, William Spinella, Gustavo A. Contrera, Milva G. Orsaria   +4 more
doaj   +1 more source

Predicting Pulsars from Imbalanced Dataset with Hybrid Resampling Approach

Advances in Astronomy, 2021
Pulsar stars, usually neutron stars, are spherical and compact objects containing a large quantity of mass. Each pulsar star possesses a magnetic field and emits a slightly different pattern of electromagnetic radiation which is used to identify the ...
Ernesto Lee, Furqan Rustam, Wajdi Aljedaani, Abid Ishaq, Vaibhav Rupapara, Imran Ashraf   +5 more
doaj   +1 more source

Electron Density Structure Measurements With Scattered Intense Laser Beam

Contributions to Plasma Physics, EarlyView.
ABSTRACT Short‐pulse intense lasers have the potential to model extreme astrophysical environments in laboratories. Although there are diagnostics for energetic electrons and ions resulting from laser‐plasma interactions, the diagnostics to measure velocity distribution functions at the interaction region of the laser and plasma are limited.
K. Sakai, K. Himeno, S. J. Tanaka, T. Asai, T. Minami, Y. Abe, F. Nikaido, K. Kuramoto, M. Kanasaki, H. Kiriyama, A. Kon, K. Kondo, N. Nakanii, W. Y. Woon, C. M. Chu, K. T. Wu, C. S. Jao, Y. L. Liu, T. A. Pikuz, H. Kohri, A. O. Tokiyasu, S. Isayama, H. S. Kumar, K. Tomita, Y. Fukuda, Y. Kuramitsu   +25 more
wiley   +1 more source

Pulsar Signal Adaptive Surrogate Modeling

Aerospace
As the number of spacecraft heading beyond Earth’s orbit increased in recent years, autonomous navigation solutions have become increasingly important. One such solution is pulsar-based navigation.
Tomáš Kašpárek, Peter Chudý
doaj   +1 more source

X-ray emission from PSR J1809-1917 and its pulsar wind nebula, possibly associated with the TeV gamma-ray source HESS J1809-193

, 2007
We detected X-ray emission from the 50-kyr-old pulsar J1809-1917 and resolved its pulsar wind nebula (PWN) with Chandra. The pulsar spectrum fits PL+BB model with the photon index of 1.2 and the BB temperature of 2 MK for n_{H}=0.7\times 10^{22} cm^{-2}.
G. G. Pavlov, Kargaltsev O., O. Kargaltsev, Sanwal D., Teter M. A.   +4 more
core   +1 more source