Autor: Fonseca, C. M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: On some conjectures regarding tridiagonal matrices
Autorzy:: Fonseca, C. M.
Tematy:: tridiagonal matrices
determinant
permanent
Chebyshev polynomials of second kind
macierz trójdiagonalna
wielomiany Czebyszewa
wyznacznik; Pokaż więcej
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Powiązania:: https://bibliotekanauki.pl/articles/122982.pdf Link otwiera się w nowym oknie
Opis:: We discuss several conjectures proposed recently by A.Z. Küçük and M. Düz on the permanent of certain type of tridiagonal matrices. We recall some less known results on tridiagonal matrices and, at the same time, bring other results together to a common framework.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Stratigraphy, palynology and organic geochemistry of the Devonian-Mississippian metasedimentary Albergaria-a-Velha Unit (Porto-Tomar shear zone, W Portugal)
Autorzy:: Machado, G.
Francu, E.
Vavrdová, M.
Flores, D.
Fonseca, P. E.
Rocha, F. T.
Pereira, L. C. G.
Gomes, A.
Fonseca, M.
Chaminé, H.
Tematy:: Mississippian
Late Devonian
Ossa-Morena Zone
Porto-Tomar shear zone
palynology
organic geochemistry; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2059150.pdf Link otwiera się w nowym oknie
Opis:: The Albergaria-a-Velha Unit is one of several tectonostratigraphic out-of-sequence units of the metamorphic belt associated with the Porto-Tomar shear zone (Ossa-Morena Zone, W Portugal). It is composed of considerably deformed - very low grade - metasediments, namely shales, siltstones and rare fine sandstones. In this work we present new sedimentological and biostratigraphical data that suggest the Albergaria-a-Velha Unit was deposited from the (?)early Frasnian to the Serpukhovian in a distal marine environment, where turbiditic and basinal sedimentation prevailed. Palynofacies analysis and lithological data point to a gradual increase of terrestrial input, suggesting a prograding system. Detrital framework data is indicative of a stable cratonic sediment source area composed of low grade metamorphic rocks. The timing of the onset of the Porto-Tomar shear zone activity and consequently its influence on the sedimentation of this unit is discussed. Organic petrology and geochemistry data indicate that the Albergaria-a-Velha Unit is within the dry gas window in terms of hydrocarbon generation ranges.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Styrene epoxidation over heterogeneous manganese (III) complexes
Autorzy:: Kuźniarska-Biernacka, I.
Lisinska-Czekaj, A.
Czekaj, D.
Alves, M. J.
Fonseca, A. M.
Neves, I. C.
Tematy:: styrene epoxidation
heterogeneous manganes; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/958207.pdf Link otwiera się w nowym oknie
Opis:: The manganes (III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese (LTI) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of Shot Peening With Glass Microspheres on the Fatigue Behavior of a Low Carbon Steel
Autorzy:: de Lacerda, J. C.
Pereira, I. R.
Costa, J. M. G.
Pinto, J. S.
Souza, H. F. M.
Fonseca, M. A.
Tematy:: fatigue
shot peening
Wöhler curve
low carbon steel
glass microspheres; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352156.pdf Link otwiera się w nowym oknie
Opis:: The present work has the objective of studying the effect of shot peening with glass microspheres on SAE 1020 steel in its resistance to fatigue. Fatigue tests were carried out by rotary bending with load control and loading on balance in specimens with and without shot peening. A rotation speed of approximately 750 rpm (12.5 Hz) was employed in the fatigue tests. Vickers microhardness tests were performed in order to verify the surface hardening produced by shot peening with glass microspheres. Analysis of the steel surface and fatigue fractures was performed using scanning electron microscopy (SEM). Fatigue tests were performed in order to obtain S-N curves (Wöhler curves). It was observed that shot peening with glass microspheres improved the fatigue strength of the steel at high cycle.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Narażenie na nanocząstki w środowisku pracy w procesach ceramicznych wykorzystujących technologię laserową
Workplace exposure to nanoparticles in ceramic processes using laser technology
Autorzy:: Fonseca, A.S.
Viana, M.
Querol, X.
Moreno, N.
De Francisco, I.
Estepa, C.
De La Fuente, G.F.
Tematy:: ceramika
pyły
nanocząstki
ablacja laserowa
spiekanie laserowe
pomiary
ceramics
dusts
nanoparticles
laser ablation
laser sintering
measurements; Pokaż więcej
Wydawca:: Centralny Instytut Ochrony Pracy
Powiązania:: https://bibliotekanauki.pl/articles/180101.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono wyniki oryginalnych badań dotyczących narażenia pracowników przemysłu ceramicznego na ultradrobnej nanocząstki, które powstają w trakcie wykorzystywania lasera do spiekania oraz w wyniku ablacji laserowej. Wyniki przeprowadzonych badań porównano z wartościami referencyjnymi, zalecanymi w stosunku do wymienionych cząstek, a także skomentowano poziom narażenia pracowników, który został uwidoczniony eksperymentalnie.
The article presents original research results regarding the exposure of workers employed in the ceramic industry towards ultra small and nanoparticles created as a result of laser sintering as well a laser ablation. The results of the research were compared with the referential values for the abovementioned particles and the experimentally proven level of worker's exposure was awarded a commentary.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Two-body photodisintegration of ^{3}He between 7 and 16 MeV
Autorzy:: Tornow, W.
Rusev, G.
Golak, Jacek
Tonchev, A. P.
Viviani, M.
Fonseca, A. C.
Skibiński, Roman
Kievsky, A.
Witała, Henryk
Karwowski, H. J.
Schiavilla, R.
Deltuva, A.
Marcucci, L. E.
Stave, S. C.
Raut, R.
Kelley, J. H.
Opis:: A comprehensive data set is reported for the two-body photodisintegration cross section of ^{3}He using mono-energetic photon beams at eleven energies between 7.0 and 16.0 MeV. A ^{3}He + Xe high-pressure gas scintillator served as target and detector. Although our data are in much better agreement with our state-of-the-art theoretical calculations than the majority of the previous data, these calculations underpredict the new data by about 10%. This disagreement suggests an incomplete understanding of the dynamics of the three-nucleon system and its response to electromagnetic probes.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Measurement of the doubly-polarized $^{3}\vec{H}e(\vec{\gamma},n)pp$ reaction at 16.5 MeV and its implications for the GDH sum rule
Autorzy:: Ahmed, M. W.
Skibiński, Roman
Laskaris, G.
Zimmerman, W. R.
Deltuva, A.
Sauer, P. U.
Flower, C.
Heideman, J. N.
Meziane, M.
Fonseca, A. C.
Xiong, W.
Witała, Henryk
Karwowski, H. J.
Wu, Y. K.
Gao, H.
Weller, H. R.
Golak, Jacek
Averett, T.
Chu, P.-H.
Mueller, J. M.
Strakovsky, I. I.
Yan, X.
Opis:: We report new measurements of the double-polarized photodisintegration of 3He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three-body channel to the Gerasimov–Drell–Hearn (GDH) integrand were extracted and compared with the state-of-the-art three-body calculations. The calculations, which include the Coulomb interaction and are in good agreement with the results of previous measurements at 12.8 and 14.7 MeV, deviate from the new cross section results at 16.5 MeV. The GDH integrand was found to be about one standard deviation larger than the maximum value predicted by the theories.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 8.

Tytuł:: Precise set of tensor analyzing power T_{20} data for the deuteron-proton breakup at 130 MeV
Autorzy:: Epelbaum, E.
Kłos, B.
Kozela, A.
Bodek, Kazimierz
Kamada, H.
Kiš, M.
Nogga, A.
Micherdzińska, A.
Mahjour-Shafiei, M.
Zejma, Jacek
Biegun, A.
Sworst, Rafał
Golak, Jacek
Zipper, W.
Ciepał, Izabela
Deltuva, A.
Stephan, E.
Kistryn, Stanisław
Fonseca, A. C.
Witała, Henryk
Skibiński, Roman
Kalantar-Nayestanaki, N.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Spin-dependent cross sections from the three-body photodisintegration of $^{3}He$ at incident energies of 12.8 and 14.7 MeV
Autorzy:: Wu, Y. K.
Mueller, J. M.
Averett, T.
Witała, Henryk
Golak, Jacek
Perdue, B. A.
Ahmed, M. W.
Zheng, W.
Sauer, P. U.
Gao, H.
Ye, Q.
Tompkins, J. R.
Qian, X.
Huang, M.
Fonseca, A. C.
Ye, Q. J.
Dutta, D.
Stave, S.
Karwowski, H. J.
Laskaris, G.
Deltuva, A.
Weller, H. R.
Lalremruata, B.
Peng, C.
Myers, L. S.
Zhang, Y.
Skibiński, Roman
Opis:: The first measurement of the three-body photodisintegration of polarized $^{3}He$ using a circularly polarized photon beam has been performed at incident energies of 12.8 and 14.7 MeV. This measurement was carried out at the high-intensity $\gamma$-ray source located at Triangle Universities Nuclear Laboratory. A high-pressure $^{3}He$ target, polarized via spin exchange optical pumping with alkali metals, was used in the experiment. The spin-dependent double- and single-differential cross sections from $^{3}\vec{He}\left ( \vec{\gamma }, n \right )pp$ for laboratory angles varying from $30^{\circ}$ to $165^{\circ}$ are presented and compared with state-of-the-art three-body calculations. The data reveal the importance of including the Coulomb interaction between protons in the three-body calculations.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: First measurements of spin-dependent double-differential cross sections and the Gerasimov-Drell-Hearn integrand from $^{3}\vec{He}\left ( \vec{\gamma }, n \right )pp$ at incident photon energies of 12.8 and 14.7 MeV
Autorzy:: Wu, Y. K.
Mueller, J. M.
Averett, T.
Witała, Henryk
Golak, Jacek
Perdue, B. A.
Ahmed, M. W.
Zheng, W.
Sauer, P. U.
Gao, H.
Ye, Q.
Tompkins, J. R.
Qian, X.
Huang, M.
Fonseca, A. C.
Ye, Q. J.
Dutta, D.
Stave, S.
Karwowski, H. J.
Laskaris, G.
Deltuva, A.
Weller, H. R.
Lalremruata, B.
Peng, C.
Myers, L. S.
Zhang, Y.
Skibiński, Roman
Opis:: The first measurement of the three-body photodisintegration of longitudinally polarized $^{3}He$ with a circularly polarized $\gamma$-ray beam was carried out at the High Intensity $\gamma$-ray Source facility located at Triangle Universities Nuclear Laboratory. The spin-dependent double-differential cross sections and the contributions from the three-body photodisintegration to the $^{3}He$ Gerasimov-Drell-Hearn integrand are presented and compared with state-of-the-art three-body calculations at the incident photon energies of 12.8 and 14.7 MeV. The data reveal the importance of including the Coulomb interaction between protons in three-body calculations.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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