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Wyświetlanie 1-15 z 30
Tytuł:
Valence Band Electronic Structure of HgMSe (M=Mn, Fe, Co)
Autorzy:
Guziewicz, A.
Kowalski, B. J.
Orłowski, B. A.
Ghijsen, J.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931745.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Eq
71.20.Fi
Opis:
The synchrotron radiation in the energy range between 40 and 80 eV was applied to investigate the electronic structure of Hg$\text{}_{0.7}$Mn$\text{}_{0.3}$Se, Hg$\text{}_{0.88}$Fe$\text{}_{0.12}$Se and Hg$\text{}_{0.93}$Co$\text{}_{0.07}$Se crystals by means of the resonant photoemission spectroscopy. The set of energy distribution curves was measured in the region near the M (M = Mn 3d$\text{}^{5}$, Fe 3d$\text{}^{6}$, Co 3d$\text{}^{7}$) 3p-3d transitions. In order to determine thoroughly the Fano type resonance energy the constant initial states curves were measured.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 817-823
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band Density of States and Mn 3d Contribution in Mn$\text{}_{1-x}$Mg$\text{}_{x}$Te
Autorzy:
Kowalski, B. J.
Guziewicz, E.
Kopalko, K.
Orłowski, B. A.
Janik, E.
Wojtowicz, T.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1991616.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Nr
79.60.-i
Opis:
Resonant photoemission spectroscopy was applied to determine the Mn 3d derived contribution to the valence band density of states of Mn$\text{}_{0.44}$ Mg$\text{}_{0.56}$Te grown by molecular beam epitaxy on a GaAs(001) substrate. The modifications of the valence band density-of-states distribution are discussed as a consequence of the substitution of Mg ions for Mn ions.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 401-405
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The maximal normal subspace of the inverse image of a normal space of sequences by a non-negative matrix transformation
Autorzy:
Johnson Jr., P. D.
Mohapatra, R. N.
Powiązania:
https://bibliotekanauki.pl/articles/714395.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Annales Polonici Mathematici; 1985, 45, 2; 105-120
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Photoemission Study of Mn 3d Electrons Contribution to the Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se Valence Band
Autorzy:
Orłowski, B. A.
Kowalski, B. J.
Le Van, Khoi
Gałązka, R. R.
Ghijsen, J.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1872563.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Fi
79.60.-i
Opis:
The resonant photoemission spectroscopy was applied to investigate the valence band electronic structure of semimagnetic semiconductor Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se crystal and to determine the contribution of Mn 3d electrons to the valence band. The set of energy distribution curves and constant initial states spectra were taken for by energies in the region (40-60 eV) close to the Mn 3p-3d transition. The electrons Mn 3d hybridize and contribute to the valence band electrons of the crystal and main density of states contribution appears in the energy 3.5 ± 0.2 eV below the valence band edge.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 329-332
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Photoemission Study of Gd 4f States in IV-VI Crystals
Autorzy:
Kowalski, B. J.
Gołacki, Z.
Guziewicz, E.
Orłowski, B. A.
Ghijsen, J.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1963391.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
Opis:
Resonant photoemission experiments were performed in order to reveal the contributions of half-filled Gd 4f$\text{}^{7}$ shell to the electronic structures of Sn$\text{}_{0.95}$Gd$\text{}_{0.05}$Te and Pb$\text{}_{0.95}$Gd$\text{}_{0.05}$S crystals. The influences of the Gd 4f$\text{}^{6}$ final-state multiplet splitting and f-ligand hybridization on the shapes of the spectra are discussed.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 819-823
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Photoemission Spectra of Zn$\text{}_{1-x}$Co$\text{}_{x}$S Valence Band
Autorzy:
Kowalski, B. J.
Gołacki, Z.
Guziewicz, A.
Orłowski, B. A.
Mašek, J.
Ghijsen, J.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931761.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Fi
Opis:
We report the results of a resonant photoemission study of Zn$\text{}_{1-x}$Co$\text{}_{x}$S. A Co 3d derived contribution to the valence band spectra was revealed as a 5 eV wide structure with two maxima: at the edge of the valence band and about 4 eV below the edge. The results were compared with the total DOS distribution resulting from tight binding-coherent potential approximation calculations.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 831-836
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polyamines and cell migration
Autorzy:
McCormack, S.A.
Johnson, L.R.
Powiązania:
https://bibliotekanauki.pl/articles/70020.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
cytoskeleton
spermine
polyamine
ornithine decarboxylase
microtubule
cell migration
actin polymerization
putrescine
spermidine
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Study of Mn 3d Electrons in the Valence Band of Mn/GeMnTe
Autorzy:
Pietrzyk, M. A.
Kowalski, B. J.
Orłowski, B. A.
Knoff, W.
Osinniy, V.
Kowalik, I. A.
Story, T.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/2047678.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Mq
Opis:
We present the results of the electronic band structure study of Ge$\text{}_{0.9}$Mn$\text{}_{0.1}$Te epilayers, clean and modified in situ by deposition of manganese atoms. The sets of resonant photoemission spectra were measured for the photon energy range covering the energy of Mn 3p→3d transition (45
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 275-281
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus
Autorzy:
Jassal, P.S.
Khajuria, R.
Sharma, R.
Debnath, P.
Verma, S.
Johnson, A.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/2096973.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ampicillin
FTIR
photocatalysis
silver nanoparticles (Ag-NPs)
TEM
Opis:
The past few decades have witnessed a tremendous increase in the consumption of antibiotics worldwide. This rampant and unregulated use of antibiotics and their improper disposal has led to the accumulation of these drugs in the environment. This in turn has led to the emergence of antibiotic resistance in microbes and has become one of the most pressing global concerns in medicine, with highly resistant pathogens of many species proving difficult to treat. The aim of the study was to synthesise silver nanoparticles (Ag-NPs) using white rot fungus, Pleurotus ostreatus and assess its potential to carry out photocatalytic degradation of ampicillin. UV–Vis spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscope have been used to characterize biosynthesized Ag-NPs. The photocatalytic degradation of ampicillin in aqueous solution by Ag-NPs was evaluated under natural sunlight. The effect of the operating conditions (contact time, Ag-NP concentration and initial ampicillin concentration) on the photocatalytic degradation was also investigated. The highest ampicillin degradation of 96.5% was observed after exposure of the solution (antibiotic + nanoparticles) for 4 h in sunlight. The maximum degradation was observed at an Ag-NP concentration of 5 ppm at pH 6. To the best of our knowledge, photocatalytic degradation of ampicillin using Ag-NPs synthesised by P. ostreatus has not been reported earlier.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 1; 5-14
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NeXus-4 measurements of selected Physiological parameters in a choral singer – preliminary results
Autorzy:
Cooper, R.G.
Alalami, U.
Ashford, R.
Johnson, P.
Powiązania:
https://bibliotekanauki.pl/articles/3522.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2011, 05, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Scattering Investigations of Magnetic Anisotropies in Ultrathin Epitaxial Co Films
Autorzy:
Hillebrands, B.
Krams, P.
Fassbender, J.
Mathieu, C.
Güntherodt, G.
Jungblut, R.
Johnson, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/1861065.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Pd
75.30.Ds
78.35.+c
Opis:
Using Brillouin light scattering, the properties of magnetic anisotropies in ultrathin epitaxial Co films grown on single-crystal Cu substrates are investigated. All relevant magnetic anisotropy contributions are determined, in situ in an ultrahigh vacuum system for the (001)-oriented films, as well as ex situ for other film orientations, which are covered with a Cu cap layer. For (001)-oriented films we find a large in-plane anisotropy contribution of fourfold symmetry. For this contribution the volume and the surface part cancel to zero at the same thickness as found for the onset of ferromagnetic order. This finding is indicative for a stabilization of ferromagnetic order in Co/Cu(001) by in-plane anisotropy contributions. In (1 1 13)-oriented films, which are composed of (001)-terraces aligned along the [11̅0]-direction and spaced by 6.5 atomic distances, an additional uniaxial in-plane anisotropy contribution is found which is identified as being of magneto-elastic origin. For (110)-oriented films three ranges of thickness dependence of the in-plane and out-of-plane anisotropy contributions are found which correlate in the thin-film regime with the growth properties. (111)-oriented films show a linear dependence of the perpendicular anisotropy on the reciprocal film thickness over the full investigated thickness range of 2 to 20 Å.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 179-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Yb on Valence Band Density of States of CdYbTe and PbYbTe - a Resonant Photoemission Study
Autorzy:
Szamota-Sadowska, K.
Kowalski, B. J.
Guziewicz, E.
Orłowski, B. A.
Sadowski, J.
Gołacki, Z.
Ghijsen, J.
Johnson, R. L.
Belkhou, R.
Radosavkič, D.
Martinotti, D.
Barrett, N.
Guillot, C.
Powiązania:
https://bibliotekanauki.pl/articles/1952185.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Vv
Opis:
Photoemission measurements using synchrotron radiation were performed on PbYbTe (bulk crystal) and CdYbTe (MBE thin film). The resonant enhancement of the photoemission was applied for investigation of the contribution of Yb 4f electrons to the valence band. The set of the energy distribution curves was collected for energies in the region close to the 4d-4f Fano transition. The Yb 4f$\text{}^{14}$ were observed at the binding energies close to the edge of the valence band while the 4f$\text{}^{13}$ states were revealed deep in the valence band.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 943-946
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gd 4f and 5d Electrons in Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te Valence Band
Autorzy:
Orłowski, B. A.
Kowalski, B. J.
Gołacki, Z.
Story, T.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1933933.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Fi
Opis:
The synchrotron radiation was applied to measure resonant photoemission spectra (Fano-type Gd 4d-4f resonance), constant initial states and constant final states to study the valence band electronic structure of Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te crystal. The resonant energy was found equal to 150.3 eV. The electrons 4f were found to contribute to the valence band of the crystal with the maximum located at 9.5 eV below the valence band edge whereas 5d electrons contribute at the crystal valence band edge.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 857-860
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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