Zobrazeno 1 - 10
of 47
pro vyhledávání: '"János Pipek"'
Publikováno v:
Entropy, Vol 21, Iss 3, p 256 (2019)
Colonoscopy is the standard device for diagnosing colorectal cancer, which develops from little lesions on the bowel wall called polyps. The Rényi entropies-based structural entropy and spatial filling factor are two scale- and resolution-independen
Externí odkaz:
https://doaj.org/article/bcefd89d863b44e4a10d741c9da6a36e
Publikováno v:
Few-Body Systems. 59
We determine the exact time-dependent non-idempotent one-particle reduced density matrix and its spectral decomposition for a harmonically confined two-particle correlated one-dimensional system when the interaction terms in the Schrodinger Hamiltoni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::383cd2548519d8a2047ba09ef6d342a2
https://doi.org/10.1007/s00601-017-1323-1
https://doi.org/10.1007/s00601-017-1323-1
Publikováno v:
SMACD
Multiresolution analysis or wavelet analysis provides a toolbox not only for signal processing, but also for synthesis of complex systems. Wavelets can be used for modeling complex parts of microwave circuits, such as cavity resonators. The different
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2a492e36af5c55587395a20cf1a60e4
https://doi.org/10.1109/smacd.2016.7520651
https://doi.org/10.1109/smacd.2016.7520651
Autor:
János Pipek, Szilvia Nagy
Publikováno v:
Journal of Computational Chemistry. 34:460-465
The wave function of a many electron system contains inhomogeneously distributed spatial details, which allows to reduce the number of fine detail wavelets in multiresolution analysis approximations. Finding a method for decimating the unnecessary ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a089c9762200d4a1b9bd528780c4f7e1
https://doi.org/10.1002/jcc.23154
https://doi.org/10.1002/jcc.23154
Autor:
János Pipek, Szilvia Nagy
Publikováno v:
Theoretical Chemistry Accounts. 125:471-479
The possibilities for reducing the necessary computation power in wavelet-based electronic structure calculations are studied. The expansion of the expectation values of energy operators, the integrals of basis functions are mostly system-independent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8bad355a4a43f19c3be072e2701e76f5
https://doi.org/10.1007/s00214-009-0653-6
https://doi.org/10.1007/s00214-009-0653-6
Autor:
Szilvia Nagy, János Pipek
Publikováno v:
Chemical Physics Letters. 464:103-106
Electron structure calculations over equidistant grids represent physical observables by matrices usually chosen as the projection of the corresponding operator in the Schrodinger picture onto the subspace expanded by the basis set of the given grid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fb189c1c1fbc6e8316be98b672f58b1
https://doi.org/10.1016/j.cplett.2008.08.091
https://doi.org/10.1016/j.cplett.2008.08.091
Autor:
János Pipek, Szilvia Nagy
Publikováno v:
Physical chemistry chemical physics : PCCP. 17(47)
In wavelet based electronic structure calculations, introducing a new, finer resolution level is usually an expensive task, this is why often a two-level approximation is used with very fine starting resolution level. This process results in large ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21a3b4d499f1a74500a6530720b056c6
https://pubmed.ncbi.nlm.nih.gov/26176200
https://pubmed.ncbi.nlm.nih.gov/26176200
Autor:
Szilvia Nagy, János Pipek
Publikováno v:
The Journal of Chemical Physics. 119:8257-8265
Multiresolution (or wavelet) analysis offers a strictly local basis set for a systematic introduction of new details into Hilbert space operators. Using this tool we have previously developed an expansion method for density matrices. The set of densi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71211c2247dcb1117175d46c91dd2d55
https://doi.org/10.1063/1.1611176
https://doi.org/10.1063/1.1611176
Publikováno v:
Journal of Mathematical Physics. 58:012203
The Coupled Cluster (CC) and full CI expansions are studied for three fermions with six and seven modes. Surprisingly the CC expansion is tailor made to characterize the usual stochastic local operations and classical communication (SLOCC) entangleme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28cfdb98107811106c8414670db4e9a8
https://doi.org/10.1063/1.4974510
https://doi.org/10.1063/1.4974510
Autor:
Szilvia Nagy, János Pipek
Publikováno v:
International Journal of Quantum Chemistry. 84:523-529
Numerical calculations show that, in extended electronic systems, complex one-particle states appear with different shape characteristics at different length scales. New results in the theory of wavelets are applied in this contribution for a consist
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c55fb3a1a08ef798467cabb46bb8aa64
https://doi.org/10.1002/qua.1406
https://doi.org/10.1002/qua.1406