Zobrazeno 1 - 10
of 225
pro vyhledávání: '"A. P. Roelfs"'
A new solution strategy for quadratic eigenvalue problems, and the derivatives of the eigenvalues, is proposed, by combining the generalized reduction method with dual numbers. To demonstrate the method, we use the quadratic eigenvalue problem encoun
Externí odkaz:
http://arxiv.org/abs/2205.11390
Autor:
De Keninck, Steven, Roelfs, Martin
Publikováno v:
Math Meth Appl Sci. 2022; 1- 17
Geometric algebras of dimension $n < 6$ are becoming increasingly popular for the modeling of 3D and 3+1D geometry. With this increased popularity comes the need for efficient algorithms for common operations such as normalization, square roots, and
Externí odkaz:
http://arxiv.org/abs/2206.07496
Autor:
E. P. Tissink, A. A. Shadrin, D. van der Meer, N. Parker, G. Hindley, D. Roelfs, O. Frei, C. C. Fan, M. Nagel, T. Nærland, M. Budisteanu, S. Djurovic, L. T. Westlye, M. P. van den Heuvel, D. Posthuma, T. Kaufmann, A. M. Dale, O. A. Andreassen
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-13 (2024)
Abstract Genetic pleiotropy is abundant across spatially distributed brain characteristics derived from one neuroimaging modality (e.g. structural, functional or diffusion magnetic resonance imaging [MRI]). A better understanding of pleiotropy across
Externí odkaz:
https://doaj.org/article/203e2f5dc82f421b993ffe55514ea803
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-17 (2024)
Abstract The Russian dandelion (Taraxacum koksaghyz) grows in temperate zones and produces large amounts of poly(cis-1,4-isoprene) in its roots, making it an attractive alternative source of natural rubber. Most T. koksaghyz plants require vernalizat
Externí odkaz:
https://doaj.org/article/9293299df4b14f0c86984b4c0a47704f
The estimation of the K\"all\'en-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an inversion strategy based on Tikhonov regularisation. We test the method on a mesonic toy model
Externí odkaz:
http://arxiv.org/abs/2112.06785
Publikováno v:
Eur. Phys. J. C 82, 251 (2022)
The estimation of the K\"all\'en-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an appropriate inversion method. As proof of concept the SU(2) glueball spectrum for the quantum
Externí odkaz:
http://arxiv.org/abs/2103.11846
Autor:
Daniel Roelfs, Oleksandr Frei, Dennis van der Meer, Elleke Tissink, Alexey Shadrin, Dag Alnaes, Ole A. Andreassen, Lars T. Westlye, Tobias Kaufmann
Publikováno v:
BMC Psychiatry, Vol 23, Iss 1, Pp 1-7 (2023)
Abstract Psychiatric disorders are complex clinical conditions with large heterogeneity and overlap in symptoms, genetic liability and brain imaging abnormalities. Building on a dimensional conceptualization of mental health, previous studies have re
Externí odkaz:
https://doaj.org/article/19e4e7b8581d4980b2344b45747a766f
Publikováno v:
Nucl. Phys. B. 952, 114912 (2020)
We consider the analytic continuation of Euclidean propagator data obtained from 4D simulations to Minkowski space. In order to perform this continuation, the common approach is to first extract the K\"all\'en-Lehmann spectral density of the field. O
Externí odkaz:
http://arxiv.org/abs/1901.05348
Autor:
Silva Melissa Wolters, Vincent Alexander Benninghaus, Kai-Uwe Roelfs, Nicole van Deenen, Richard M. Twyman, Dirk Prüfer, Christian Schulze Gronover
Publikováno v:
Frontiers in Plant Science, Vol 14 (2023)
IntroductionPlant growth and greening in response to light require the synthesis of photosynthetic pigments such as chlorophylls and carotenoids, which are derived from isoprenoid precursors. In Arabidopsis, the pseudo-etiolated-in-light phenotype is
Externí odkaz:
https://doaj.org/article/1e7c3b67094e4ceebe2179360e7b47ae
Autor:
Cucchieri, Attilio, Dudal, David, Mendes, Tereza, Oliveira, Orlando, Roelfs, Martin, Silva, Paulo J.
We discuss possible definitions of the Faddeev-Popov matrix for the minimal linear covariant gauge on the lattice and present preliminary results for the ghost propagator.
Comment: 8 pages (XIII Quark Confinement and the Hadron Spectrum - Confin
Comment: 8 pages (XIII Quark Confinement and the Hadron Spectrum - Confin
Externí odkaz:
http://arxiv.org/abs/1812.00429