Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Sprenger Tim"'
Autor:
Wood Alan G., Dorrian Gareth D., Boyde Ben, Fallows Richard A., Themens David R., Mevius Maaijke, Sprenger Tim, Main Robert, Pryse S. Eleri, Elvidge Sean
Publikováno v:
Journal of Space Weather and Space Climate, Vol 14, p 27 (2024)
Observations made with the Low-Frequency Array (LOFAR) have been used to infer the presence of variations in a sporadic E layer on a spatial scale of several kilometres and a temporal scale of ~10 min. LOFAR stations across the Netherlands observed C
Externí odkaz:
https://doaj.org/article/a5b5fc6d5d6d4b4a8097fdfb53fd0bc3
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2022, Volume 515, Issue 4, pp.6198-6216
We report on observations of PSR B1508+55's scintillation at the Effelsberg 100-m telescope spanning from early 2020 to early 2022. In the autumn of 2020, close to the time the pulsar was predicted to cross echoes in its pulse profile, a sudden trans
Externí odkaz:
http://arxiv.org/abs/2204.13985
Autor:
Baker, Daniel, Brisken, Walter, van Kerkwijk, Marten H., Main, Robert, Pen, Ue-Li, Sprenger, Tim, Wucknitz, Olaf
The parabolic structure of the secondary or conjugate spectra of pulsars is often the result of isolated one-dimensional (or at least highly anisotropic) lenses in the ISM. The curvature of these features contains information about the velocities of
Externí odkaz:
http://arxiv.org/abs/2101.04646
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2020, Volume 500, Issue 1, pp.1114-1124
We introduce a novel analysis technique for pulsar secondary spectra. The power spectrum of pulsar scintillation (referred to as the "secondary spectrum") shows differential delays and Doppler shifts due to interference from multi-path propagation th
Externí odkaz:
http://arxiv.org/abs/2008.09443
Autor:
Benjamin, Arnold Julian Vinoj, Gomez, Pedro A., Golbabaee, Mohammad, Mahbub, Zaid, Sprenger, Tim, Davies, Marion I. Menzel Michael, Marshall, Ian
Purpose: To develop an accelerated Cartesian MRF implementation using a multi-shot EPI sequence for rapid simultaneous quantification of T1 and T2 parameters. Methods: The proposed Cartesian MRF method involved the acquisition of highly subsampled MR
Externí odkaz:
http://arxiv.org/abs/1906.08195
Akademický článek
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Autor:
Benjamin, Arnold Julian Vinoj, Gómez, Pedro A., Golbabaee, Mohammad, Sprenger, Tim, Menzel, Marion I., Davies, Mike E., Marshall, Ian
The main purpose of this study is to show that a highly accelerated Cartesian MRF scheme using a multi-shot EPI readout (i.e. multi-shot EPI-MRF) can produce good quality multi-parametric maps such as T1, T2 and proton density (PD) in a sufficiently
Externí odkaz:
http://arxiv.org/abs/1809.02506
Autor:
Brinckmann, Thejs, Hooper, Deanna C., Archidiacono, Maria, Lesgourgues, Julien, Sprenger, Tim
Publikováno v:
JCAP 1901 (2019) 059
We forecast the sensitivity of thirty-five different combinations of future Cosmic Microwave Background and Large Scale Structure data sets to cosmological parameters and to the total neutrino mass. We work under conservative assumptions accounting f
Externí odkaz:
http://arxiv.org/abs/1808.05955
Autor:
Vagnozzi, Sunny, Brinckmann, Thejs, Archidiacono, Maria, Freese, Katherine, Gerbino, Martina, Lesgourgues, Julien, Sprenger, Tim
Publikováno v:
JCAP 1809 (2018) 001
In cosmologies with massive neutrinos, the galaxy bias defined with respect to the total matter field (cold dark matter, baryons, and non-relativistic neutrinos) depends on the sum of the neutrino masses $M_{\nu}$, and becomes scale-dependent even on
Externí odkaz:
http://arxiv.org/abs/1807.04672
Autor:
Sprenger, Tim, Archidiacono, Maria, Brinckmann, Thejs, Clesse, Sébastien, Lesgourgues, Julien
Theoretical uncertainties on non-linear scales are among the main obstacles to exploit the sensitivity of forthcoming galaxy and hydrogen surveys like Euclid or the Square Kilometre Array (SKA). Here, we devise a new method to model the theoretical e
Externí odkaz:
http://arxiv.org/abs/1801.08331