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Keywords: Numerical methods
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Journal Article
Methods for robustly measuring the minimum spanning tree and other field level statistics from galaxy surveys Open Access
Krishna Naidoo and Ofer Lahav
RAS Techniques and Instruments, Volume 4, 2025, rzaf014, https://doi.org/10.1093/rasti/rzaf014
Published: 28 April 2025
... the effects of survey selection functions. We outline how to measure field level statistics from future surveys. Data Methods Numerical methods large-scale structure of Universe cosmology: observations Royal Society 10.13039/501100000288 URF\R\231006 STFC 10.13039/501100000271 ST/R000476/1...
Journal Article
Disc–star alignment I: pre-main-sequence stellar parameters and the statistical alignment between discs and stellar rotation Open Access
Matthew J Fields and others
RAS Techniques and Instruments, Volume 4, 2025, rzaf009, https://doi.org/10.1093/rasti/rzaf009
Published: 08 April 2025
... stellar rotation star formation numerical methods NASA 10.13039/100000104 #80NSSC21K0393 Discs of gas and dust surrounding newly formed stars (called ‘protoplanetary’ or ‘planet-forming’ discs) are natural consequences of angular momentum conservation as molecular clouds collapse to form protostars...
Journal Article
DigiGREF: a digital analogue of the Mercury Imaging X-ray Spectrometer Ground-Reference Facility Open Access
Graeme P Hall and others
RAS Techniques and Instruments, Volume 4, 2025, rzaf008, https://doi.org/10.1093/rasti/rzaf008
Published: 08 March 2025
... a suitable basis for future development, eventually leading to analysis of data returned by MIXS during the orbital mission. Numerical Methods X-ray Fluorescence X-ray Tube Mercury Imaging X-ray Spectrometer UK Space Agency 10.13039/100011690 ST/X001970/1 E-mail: [email protected] 24 05 2024...
Journal Article
Deep learning generated observations of galaxy clusters from dark-matter-only simulations Open Access
Andrés Caro and others
RAS Techniques and Instruments, Volume 4, 2025, rzaf007, https://doi.org/10.1093/rasti/rzaf007
Published: 06 March 2025
... show excellent agreement with the ground-truth data sets, with percentage errors averaging (0.5 0.1) per cent for the parameters of the scaling laws. Data Methods Numerical Methods Machine Learning Simulations Dark Matter Clusters of Galaxies Ministerio de Ciencia e Innovación 10.13039...
Journal Article
vis-r: Quick radial profile modelling for radio interferometric visibilities Open Access
Grant M Kennedy
RAS Techniques and Instruments, Volume 4, 2025, rzaf004, https://doi.org/10.1093/rasti/rzaf004
Published: 19 February 2025
...Grant M Kennedy Numerical methods Software Interferometry Circumstellar discs Royal Society 10.13039/501100000288 Interferometry is a commonly used tool in astronomy. It circumvents problems that arise from the desire to have high angular resolution at a reasonable price point, but at the cost...
Journal Article
Stability of stationary states for mean field models with multichromatic interaction potentials Open Access
Benedetta Bertoli and others
IMA Journal of Applied Mathematics, hxaf001, https://doi.org/10.1093/imamat/hxaf001
Published: 13 January 2025
... for the interacting particle systems and the PDEs. mean field PDEs bifurcation theory phase transitions spectral numerical methods Nonlinear and nonlocal Fokker–Planck type equations, i.e. McKean–Vlasov equations appear in several applications, including stellar dynamics Binney & Tremaine (2008) , plasma...
Journal Article
Radiance cascades: a novel high-resolution formal solution for multidimensional non-LTE radiative transfer Open Access
C M J Osborne and A Sannikov
RAS Techniques and Instruments, Volume 4, 2025, rzae062, https://doi.org/10.1093/rasti/rzae062
Published: 19 December 2024
... the atomic populations following these transition rates, and iterating this process until convergence. For unpolarized radiation, the workhorse numerical methods of short characteristics (Kunasz & Auer 1988 ) for solving the radiative transfer equation for the radiation field, and a preconditioned...
Journal Article
Microchannel plate response to solar energetic particles and consequences for solar-wind measurements on ESA’s Vigil mission Open Access
P-Y Parent and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 844–852, https://doi.org/10.1093/rasti/rzae053
Published: 30 November 2024
... through the instrument shielding, do not depend on the settings of the instrument in terms of U, , and . Plasma Instrumentation Energetic particles Noise Numerical methods National Aeronautics and Space Administration 10.13039/100000104 European Society of Anaesthesiology...
Journal Article
Statistical estimation of full-sky radio maps from 21 cm array visibility data using Gaussian constrained realizations Open Access
Katrine A Glasscock and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 607–624, https://doi.org/10.1093/rasti/rzae041
Published: 07 October 2024
... of Universe methods: statistical numerical methods techniques: interferometric European Research Council 10.13039/100010663 948764 STFC 10.13039/501100000271 STFC 10.13039/501100000271 ST/P002293/1 ST/R002371/1 ST/S002502/1 ST/R000832/1 Through measurements of the cosmic microwave...
Journal Article
Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications Open Access
Katy L Chubb and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 636–690, https://doi.org/10.1093/rasti/rzae039
Published: 19 September 2024
... information on existing sources of data whether in data bases, theoretical, or literature sources. Data Methods Numerical methods Algorithms Ariel Data needs European Research Council 10.13039/100010663 883830 EP/Y006313/1 UK Research and Innovation 10.13039/100014013 STFC 10.13039...
Journal Article
A generalized approach for pricing American options under a regime-switching model
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Yawen Zheng and Song-Ping Zhu
IMA Journal of Management Mathematics, dpae021, https://doi.org/10.1093/imaman/dpae021
Published: 10 September 2024
... simple roots within the original system. regime-switching model hidden Markov model integral equation American option numerical methods where the supremum is taken over the set of stopping times . Here, , where denotes the price of the American put option in Regime . Applying...
Journal Article
Computational forms for binary particle interactions at different levels of anisotropy Open Access
Christopher N Everett and Garret Cotter
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 548–555, https://doi.org/10.1093/rasti/rzae036
Published: 24 August 2024
.... The emission spectrum is then further extended to axisymmetric particle distributions, where two-dimensional spectral maps can be generated to provide new insight. Numerical Methods Reaction Rate Collision Integral Anisotropic Kinetic Theory Boltzmann Equation STFC 10.13039/501100000271 ST/X508664/1...
Journal Article
Spacecraft potential effects on low-energy ion measurements to be made by probe B1 of Comet Interceptor Open Access
S Bergman and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 333–346, https://doi.org/10.1093/rasti/rzae021
Published: 18 June 2024
..., are detectable by the instrument considering the nominal observation geometry. Numerical Methods Instrumentation Data Methods Plasma Comets SPIS Japan Society for the Promotion of Science 10.13039/501100001691 22F22723 In 2019, Comet Interceptor (Jones et al. 2024 ) was selected by the European Space...
Journal Article
Reconstructing robust background integral field unit spectra using machine learning Open Access
Carter Lee Rhea and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 234–246, https://doi.org/10.1093/rasti/rzae017
Published: 25 April 2024
... the approach is applied explicitly to SITELLE data in this study, we argue that it can be readily adapted to any integral field unit style data, enabling the user to obtain more robust measurements on the flux of the emission lines. Machine Learning Numerical Methods Algorithms Automatic Background...
Journal Article
The verification of periodicity with the use of recurrent neural networks Open Access
N Miller and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 224–233, https://doi.org/10.1093/rasti/rzae015
Published: 23 April 2024
... of the light curve, and we establish minimum values for the number of data points and the amplitude to noise ratio. Machine Learning Numerical Methods Data Methods Algorithms Light curves Variable Stars The input also includes a feature that is derived from an interpolated fit of the time-series with 200...
Journal Article
republic : A variability-preserving systematic-correction algorithm for PLATO’s multi-camera light curves
Open Access
Oscar Barragán and others
RAS Techniques and Instruments, Volume 3, Issue 1, January 2024, Pages 198–208, https://doi.org/10.1093/rasti/rzae014
Published: 22 April 2024
... cameras get a ‘vote’ in determining the ‘true’ astrophysical signal. This allows for an efficient separation of any astrophysical signal from the systematics, provided that the latter differ sufficiently from camera to camera. Data Methods Numerical Methods Algorithms Techniques: Photometric Abstract...
Journal Article
Pre-perihelion observations of long-period comet C/2013 X1 (PANSTARRS) Open Access
Olena Shubina and others
Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 4, March 2024, Pages 7027–7036, https://doi.org/10.1093/mnras/stae441
Published: 13 February 2024
... particles as light scatters, and the chemical composition of dust particles in the coma of 74 per cent amorphous carbon, 25 per cent of Mg-rich silicates, and 1 per cent of water ice. methods: numerical – methods: observational techniques: photometric techniques: polarimetric techniques: spectroscopic...
Journal Article
Bayesian model comparison for simulation-based inference Open Access
A Spurio Mancini and others
RAS Techniques and Instruments, Volume 2, Issue 1, January 2023, Pages 710–722, https://doi.org/10.1093/rasti/rzad051
Published: 08 November 2023
.... These results highlight the potential of harmonic as a sampler-agnostic method to estimate the model evidence in both likelihood-based and simulation-based scenarios. Machine Learning Numerical Methods Software Statistics Simulation-based Inference STFC 10.13039/501100000271 ST/W001136/1...
Journal Article
Marine CSEM synthetic study to assess the detection of CO2 escape and saturation changes within a submarine chimney connected to a CO2 storage site Open Access
Naima K Yilo and others
Geophysical Journal International, Volume 236, Issue 1, January 2024, Pages 183–206, https://doi.org/10.1093/gji/ggad366
Published: 26 September 2023
... 3-D electric field. This study illustrates the value of incorporating CSEM into measurement, monitoring and verification strategies for optimal operation of marine CCS sites. Controlled source electromagnetics (CSEM) Electrical resistivity Marine electromagnetics Numerical methods Carbon capture...
Journal Article
A set of codes for numerical convection and geodynamo calculations Open Access
Steven J Gibbons and others
RAS Techniques and Instruments, Volume 2, Issue 1, January 2023, Pages 637–648, https://doi.org/10.1093/rasti/rzad043
Published: 01 September 2023
..., colatitude, and longitude, respectively. The steady, basic-state, temperature distribution, T0(r), is given the form (3) $$\begin{eqnarray}
T_0( r ) = -\frac{1}{2}b_1 r^2 + \frac{ b_2 }{ r } + b_3
,
\end{eqnarray}$$ Software Numerical Methods Dynamo theory Convection Core...
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