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    Wyświetlanie 1-38 z 38
    Tytuł:
    A note on the predual of Lip(S, d)
    Autorzy:
    Johnson, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/723328.pdf
    Data publikacji:
    1979
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1978-1979, 40, 2; 287-289
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new neolepadid cirripede from a Pleistocene cold seep, Krishna-Godavari Basin, offshore India
    Autorzy:
    Gale, A.S.
    Little, C.T.S.
    Johnson, J.E.
    Giosan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082175.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cirripedia
    Thoracica
    Neolepadidae
    cold seep
    Pleistocene
    Indian Ocean
    Opis:
    Valves of a thoracican cirripede belonging to a new species of the Neolepadidae, Ashinkailepas indica Gale sp. nov. are described from a Late Pleistocene cold seep (52.6 ka), cored in the Krishna-Godavari Basin, offshore from the eastern coast of India. This constitutes the first fossil record of the genus, and its first occurrence in the Indian Ocean. Other fossil records of the Neolepadidae (here elevated to full family status) are discussed, and it is concluded that only Stipilepas molerensis from the Eocene of Denmark, is correctly referred to the family. Cladistic analysis of the Neolepadidae supports a basal position for Ashinkailepas, as deduced independently from molecular studies, and the Lower Cretaceous brachylepadid genus Pedupycnolepas is identified as sister taxon to Neolepadidae. Neolepadids are not Mesozoic relics as claimed, preserved in association with the highly specialised environments of cold seeps and hydrothermal vents, but are rather an early Cenozoic offshoot from the clade which also gave rise to the sessile cirripedes.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 2; 351-362
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of 4f Level in Samarium-Rich MBE Grown CdSmTe Sample
    Autorzy:
    Szamota-Sadowska, K.
    Gołacki, Z.
    Orłowski, B. A.
    Boyn, R.
    Johnson, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991645.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.At
    79.60.-i
    79.60.Bm
    Opis:
    Electronic states of 4f samarium ions were investigated by photoemission spectroscopy in samarium-rich CdSmTe sample obtained by MBE. The photon energy of synchrotron radiation allowed to investigate Fano-type resonance and antiresonance. The energy distribution curve spectra were attributed to the Sm 4d-4f transition. The shape of the constant initial states spectra was compared with this one obtained for atomic samarium.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 560-564
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Job Safety Program for Construction Workers Designed to Reduce the Potential for Occupational Injury Using Tool Box Training Sessions and Computer-Assisted Biofeedback Stress Management Techniques
    Autorzy:
    Johnson, K. A.
    Ruppe, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/89956.pdf
    Data publikacji:
    2002
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    job
    safety
    ergonomics
    biofeedback
    stress
    computer-assisted
    training
    ergonomia
    stres
    komputer
    bezpieczeństwo pracy
    szkolenie metodami audiowizualnymi
    szkolenie zawodowe
    budownictwo
    satysfakcja z pracy
    Opis:
    This project was conducted with a multicultural construction company in Hawaii, USA. The job duties performed included drywall and carpentry work. The following objectives were selected for this project: (a) fire prevention training and inspection of first aid equipment; (b) blood-borne pathogen training and risk evaluation; (c) ergonomic and risk evaluation intervention program; (d) electrical safety training and inspection program; (e) slips, trips, and falls safety training; (f) stress assessment and Personal Profile System; (g) safety and health program survey; (h) improving employee relations and morale by emphasizing spirituality; and (i) computer-assisted biofeedback stress management training. Results of the project indicated that observed safety hazards, reported injuries, and levels of perceived stress were reduced for the majority of the population.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2002, 8, 3; 321-329
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometry of Banach spaces and biorthogonal systems
    Autorzy:
    Dilworth, S. J.
    Girardi, Maria
    Johnson, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1206044.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    A separable Banach space X contains $ℓ_1$ isomorphically if and only if X has a bounded fundamental total $wc_{0}*$-stable biorthogonal system. The dual of a separable Banach space X fails the Schur property if and only if X has a bounded fundamental total $wc_{0}*$-biorthogonal system.
    Źródło:
    Studia Mathematica; 2000, 140, 3; 243-271
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Premixed combustion of acetylene-hydrogen fuel mixtures for thermodynamic state generation in a constant volume combustion vessel
    Autorzy:
    Johnson, S.
    Nesbitt, J.
    Lee, S. -Y.
    Naber, J. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/242374.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engine
    diesel engine
    combustion processes
    pressure vessel
    preborn
    Opis:
    Flammability limits and flame speeds of dilute-lean fuel mixtures of hydrogen (H2) and acetylem premixed with oxygen (02) and nitrogen (N2) were examined with a detailed kinetics model. These mixtures are used in a preburn in a constant volume combustion vessel to create elevated temperatures and pressures with gas compositions that represent the thermodynamic state in a diesel engine combustion chamber at fuel injection and auto ignition. A mixture of hydrogen and acetylene with combined atomic hydrogen to carbon ratio (HCR) of 1.85 was used to match that of typical diesel fuel and results are shown in comparison to a previously used mixture with a HCR of 1.17. The lower flammability limit (LFL) of the HCR 1.85 fuel mixture was found at an equivalence ratio of 0.235, while flame speed and adiabatic combustion temperatures were also predicted for post preburn product oxygen levels between O and 21 percent. Flame speeds were shown to decrease with a reduction in oxygen concentration, an increase in nitrogen dilution, while combustion temperatures increased over most of this range. Trends for this relation of flame speed and temperature are presented and a new premixed fuel mixture with an HCR of 1.85 is proposed.
    Źródło:
    Journal of KONES; 2009, 16, 2; 199-208
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acousto-Optic Tunable Filters for Imaging Applications in the 2-4 μm with Low RF Drive Power
    Autorzy:
    Valle, S.
    Ward, J.
    Pannell, C.
    Johnson, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383267.pdf
    Data publikacji:
    2015-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    78.20.hb
    62.40.+i
    Opis:
    The $λ^{2}$ dependence on acoustic field intensity (and hence RF drive power) can render large aperture acousto-optic tunable filters impractical for many applications beyond about 2 μm. One potential technique for reducing the RF drive-power requirement is to configure an acousto-optic tunable filter such that the interaction region is at acoustic resonance. We describe an acousto-optic tunable filter that operates at resonance and present an analysis of the predicted performance. In addition, we address the practical issues in deploying such a scheme. Finally, we present results of a prototype "resonant acousto-optic tunable filter" operating in the 1-2 μm region.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 1; 58-59
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ergonomic design of interface for conceptual floor plan model and spatial event handling in rfid application
    Autorzy:
    Gavrilova, M.
    Nayyar, S.
    Gilgen, J.
    Johnson, O.
    Ghali, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/333132.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    RFID
    Wi-Fi
    ergonomia
    interfejs użytkownika
    zastosowania medyczne
    floor model
    path tracking
    ergonomic
    user interface
    space and time pattern analysis
    medical applications
    Opis:
    The development of advanced spatial-positioning and monitoring systems for medical monitoring and emergency response using RFID & Wi-Fi technologies is a large-scale research project being conducted at the ward W21C of Foothills Hospital, Calgary, Canada by University of Calgary. The scope of this project is to support real-time location tracking of medical equipments and personnel in hospital settings. In this context, we developed an innovative, interactive, decision-support medical system for tracking of personnel and high value medical equipments. The goal behind development of such a system is to provide a convenient, easy to use interface using existing technologies that allows to visualize and analyse clinical pathways and health care provider’s workflow pattern as well as to perform time motion studies and more advanced statistical pattern analysis. While achieving this goal, we aim to also fill the existing void of documentation and present to scientific community functional issues encountered along with their importance in success.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 169-174
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Explosive dust test vessel comparison using pulverized Pittsburgh coal
    Porównanie urządzeń testujących tendencje pyłu węglowego do wybuchu z wykorzystaniem rozdrobnionego węgla z kopalni w Pittsburgu (USA)
    Autorzy:
    Miller, J.
    Schafler, J.
    Mulligan, P.
    Eades, R.
    Perry, K.
    Johnson, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/219067.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pył węglowy
    wybuch pyłu węglowego
    ASTM E1226
    węgiel z kopalni w Pittsburgu
    coal dust
    coal dust explosion
    Pittsburgh coal
    Opis:
    Explosions of coal dust are a major safety concern within the coal mining industry. The explosion and subsequent fires caused by coal dust can result in significant property damage, loss of life in underground coal mines and damage to coal processing facilities. The United States Bureau of Mines conducted research on coal dust explosions until 1996 when it was dissolved. In the following years, the American Society for Testing and Materials (ASTM) developed a test standard, ASTM E1226, to provide a standard test method characterizing the “explosibility” of particulate solids of combustible materials suspended in air. The research presented herein investigates the explosive characteristic of Pulverized Pittsburgh Coal dust using the ASTM E1226-12 test standard. The explosibility characteristics include: maximum explosion pressure, (Pmax); maximum rate of pressure rise, (dP/dt)max; and explosibility index, (Kst). Nine Pulverized Pittsburgh Coal dust concentrations, ranging from 30 to 1,500 g/m3, were tested in a 20-Liter Siwek Sphere. The newly recorded dust explosibility characteristics are then compared to explosibility characteristics published by the Bureau of Mines in their 20 liter vessel and procedure predating ASTM E1126-12. The information presented in this paper will allow for structures and devices to be built to protect people from the effects of coal dust explosions.
    Wybuchy pyłu węglowego są jednym z głównych zagrożeń związanych z bezpieczeństwem pracy w górnictwie węgla. Wybuchy i spowodowane przez nie pożary skutkują poważnymi zniszczeniami w kopalniach podziemnych, powodować mogą ofiary śmiertelne a także uszkodzić urządzenia do transportu i przeróbki węgla. Instytut Górnictwa w USA (The United States Bureau of Mines) prowadził badania nad wybuchami pyłu węglowego do roku 1996, kiedy to Instytut został rozwiązany. W kolejnych latach Amerykańskie Stowarzyszenie Badań Materiałów (ASTM) opracowało normę ASTM E1226, określającą standardową metodę badania w celu określenia skłonności do wybuchu części stałych substancji palnych zawieszonych w powietrzu. W pracy przedstawiono badania właściwości wybuchowych pyłu węglowego z rozdrobnionego węgla z kopalni w Pittsburgu w oparciu o metodę określoną w dokumencie normatywnym ASTM E1226-12. Charakterystyka skłonności pyłu do wybuchu obejmuje następujące parametry: maksymalne ciśnienie wybuchu (Pmax), maksymalne tempo wzrostu ciśnienia (dP/dt)max, oraz wskaźnik (Kst) określający skłonność pyłu do wybuchu. Do badań wykorzystano dziewięć próbek różniących się stężeniem pyłu węglowego (od 30 do 1500 g/m3). Badania przeprowadzono z wykorzystaniem 20-litrowej komory w kształcie kuli. Otrzymane charakterystyki porównano następnie do charakterystyk opublikowanych przez Amerykański Instytut Górnictwo po przeprowadzeniu badań z użyciem 20-litrowej komory będącej na wyposażeniu Instytutu oraz w oparciu o procedury stosowane przed wprowadzeniem normy ASTM E1126-12. Informacje zebrane w niniejszej pracy pozwolą na opracowanie konstrukcji i urządzeń które skutecznie będą mogły chronić ludzi przed skutkami wybuchów pyłu węglowego.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 3; 713-726
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    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:
    Contribution of Mn 3d Electrons To the Valence Band of Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$te
    Autorzy:
    Nadolny, A. J.
    Guziewicz, E.
    Kowalski, B. J.
    Orłowski, B. A.
    Johnson, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992049.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Nr
    Opis:
    The synchrotron radiation in the energy range between 15 and 70 eV was used to investigate the electronic structure of the crystalline Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$Te by means of the resonant photoemission spectroscopy. Fano-type resonance has been observed in the obtained constant initial energy curves with the resonant energy 50.6 eV and antiresonant energy 49.0 eV. The energy distribution curves taken at photon energies close to the Mn 3p-3d transitions allow us to conclude that Mn atoms contribute to the valence band mainly at energies of 4.0 eV and 7.8 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 454-458
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cd_{1-x}Fe_{x}Te Ternary Crystal Formation Studied by Resonant Photoemission
    Autorzy:
    Guziewicz, E.
    Kowalski, B. J.
    Gołacki, Z.
    Orłowski, B. A.
    Johnson, R. L.
    Masek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968113.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Fx
    79.60.-i
    Opis:
    A resonant photoemission was used to study the ternary crystal formation, when small amount of Fe atoms was deposited (in one monolayer range of thickness) on the clean CdTe(100) surface. The constant initial state spectra taken near the Fe 3p-3d transition after Fe deposition and then again after heating process show the existence of two Fano-like resonance. The differences of the energy distribution curves taken for both resonance and antiresonance, respectively, allow us to distinguish two kind of Fe 3d contributions to the valence band: one derived from the metallic Fe islands on the surface and the second - derived from the Fe atoms built into the Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te crystal.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 793-796
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    4f Shell of Gd$\text{}^{2+}$ and Gd$\text{}^{3+}$ Ions in Sn$\text{}_{1-x}$Gd$\text{}_{x}$Te - Resonant Photoemission Study
    Autorzy:
    Kowalski, B. J.
    Gołacki, Z.
    Guziewicz, E.
    Orłowski, B.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968282.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    79.60.-i
    Opis:
    Resonant photoemission spectra of Sn$\text{}_{1-x}$Gd$\text{}_{x}$Te (x=0.02 and 0.08) measured for the photon energy range 142 to 151 eV show the valence band density of states distribution and the Gd 4f derived maximum. The energy position of the J=0 component of the Gd 4f maximum was determined and used as a measure of the Gd 4f shell binding energy. The electrostatic model of core level shifts was used to interpret the difference in the Gd 4f binding energies observed for x=0.02 and x=0.08.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 875-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    4f Contribution to Valence Band of Pb$\text{}_{1-x}$RE$\text{}_{x}$S (RE = Eu,Gd) Studied by Resonant Photoemission
    Autorzy:
    Kowalski, B. J.
    Gołacki, Z.
    Guziewicz, E.
    Orłowski, B. A.
    Ghijsen, J.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952558.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    79.60.-i
    Opis:
    Resonant photoemission experiments were carried out in order to reveal the contributions of partly filled Eu 4f$\text{}^{7}$ and Gd 4f$\text{}^{7}$ shells to the valence bands of Pb$\text{}_{0.95}$Eu$\text{}_{0.05}$S and Pb$\text{}_{0.95}$Gd$\text{}_{0.05}$S crystals. The coupling between these orbitals and the host electronic states is discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1035-1039
    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:
    Chaotic Time-Reversed Acoustics: Sensitivity οf the Loschmidt Echo to Perturbations
    Autorzy:
    Taddese, B.
    Johnson, M.
    Hart, J.
    Antonsen, T.
    Ott, E.
    Anlage, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585110.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.55.Kk
    05.45.Mt
    43.58.+z
    43.60.+d
    Opis:
    We experimentally demonstrate a new acoustic sensor based on the concept of quantum mechanical scattering fidelity and the Loschmidt echo applied to classical acoustic waves in air. The sensor employs a one-recording-channel time-reversal mirror that exploits spatial reciprocity to sensitively measure the classical analog of the scattering fidelity of an enclosed region. The experiments are carried out in a stairwell using a simple speaker and microphone. The input is a 7.0 kHz signal that is amplitude modulated with a 1 ms long pulse. We examine the sensitivity of the time-reversed reconstructed pulse to phase noise, long term drift, and to typical perturbations caused by the rotation of an object in the scattering environment.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 729-732
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fe 3d Contribution to the Valence Band of Cubic Hg$\text{}_{1-x}$Fe$\text{}_{x}$S - Resonant Photoemission Study
    Autorzy:
    Kowalski, B. J.
    Orłowski, B. A.
    Szuszkiewicz, W.
    Witkowska, B.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933837.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    Opis:
    Resonant photoemission spectra of cubic Ηg$\text{}_{0.94}$Fe$\text{}_{0.06}$S were measured for photon energies near to the energy of intra atomic Fe 3p$\text{}^{6}$3d$\text{}^{6}$ → 3p$\text{}^{5}$3d$\text{}^{7}$ transition. The difference between the spectra taken at resonance and antiresonance is presented as a measure of the energy distribution of Fe 3d derived states. The results obtained show that Fe 3d states contribute to the whole valence band with a distinct structure appearing at the band edge.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 791-794
    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
    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:
    Defects and Defect Reactions in Semiconductor Nitrides
    Autorzy:
    Van de Walle, C. G.
    Neugebauer, J.
    Stampfl, C.
    McCluskey, M. D.
    Johnson, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011140.pdf
    Data publikacji:
    1999-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Bb
    61.72.Ji
    61.82.Fk
    71.55.Eq
    Opis:
    We report a comprehensive investigation of native point defects and impurities in GaN, AlN, and AlGaN alloys, with the goal of understanding doping limitations in nitride semiconductors. Unintentional incorporation of impurities (mainly oxygen) explains the tendency of nitride semiconductors to exhibit n-type conductivity. Silicon is the n-type dopant of choice; it remains shallow in AlGaN up to high Al content, while oxygen undergoes a DX transition. Experimental evidence for DX centers will be discussed. In p-type material, Mg doping is hindered by an increase in ionization energy with increasing Al content in AlGaN, and by nitrogen vacancies acting as compensating centers. Complex formation between magnesium and oxygen and between magnesium and nitrogen vacancies will be discussed.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 5; 613-627
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ochrona przed przeciążeniami + 12 Gz
    Autorzy:
    Ivan, D. J.
    Stern, C. H.
    Patterson, J. C.
    Johnson, P. C.
    Drew, W. E.
    Yates, J. T.
    Burns, J. W.
    Powiązania:
    Polski Przegląd Medycyny Lotniczej 2001, nr 4, s. 369-388
    Współwytwórcy:
    Domin, Artur. Tłumaczenie
    Data publikacji:
    2001
    Tematy:
    Medycyna wojskowa lotnicza
    Przeciążenie (lot.) badania
    Piloci przeciążenie badania
    Opis:
    Rys., tab.; Bibliogr.; Sum.; Tł. art. zamieszcz. w "Aviation Space, and Environmental Medicine". --- May 2001, s. 413-421.
    Dostawca treści:
    Bibliografia CBW
    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:
    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:
    Band Structure of Mn/ZnTe Studied, by Angle-Resolved Photoelectron Spectroscopy
    Autorzy:
    Kowalski, B. J.
    Orlowski, B. A.
    Pietrzyk, M.
    Kaczor, P.
    Kopalko, K.
    Mickievicius, S.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044491.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.23.-k
    Opis:
    The electronic band structure of Mn/ZnTe(110) (1×1) has been studied by angle-resolved photoelectron spectroscopy. The sets of spectra were acquired for the clean surface and after in situ deposition of 0.4 ML of Mn, in order to compare the band structures and to reveal changes brought about by the presence of Mn. The experimental band structure diagram of Mn/ZnTe along theΓ-K direction in the Brillouin zone has been derived from the experimental data. Indications of interaction between the Mn 3d states and sp$\text{}^{3}$ bands of the semiconductor are discussed.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 735-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cr 3d Surface and Bulk States in Sn$\text{}_{1-x}$Cr$\text{}_{x}$Te/Cr Crystals
    Autorzy:
    Guziewicz, E.
    Szamota-Sadowska, K.
    Kowalski, B. J.
    Grodzicka, E.
    Story, T.
    Orłowski, B. A.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963380.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Fx
    79.60.-i
    Opis:
    We report a new approach to investigate metal-semiconductor interface formation. Photoemission spectroscopy was applied in order to investigate the clean surface of a Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$ Te crystal and to observe its changes under sequential deposition of small amounts of Cr atoms. In order to analyse the Cr 3d contribution to the valence band, the Fano-type resonance tuned to the Cr 3p-3d transition was used. The experiment was designed to follow the Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$ Te/Cr interface formation process. At the clean Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$Te surface, the Cr 3d states contribution to the valence band was found to be positioned 0.8 eV below the Fermi level. After the Cr deposition processes the contribution shifted to a higher binding energy and another contribution 5.8 eV below the Fermi level was also observed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 783-787
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    Fano Resonance of Eu$\text{}^{2+}$ and Eu$\text{}^{3+}$ in (Eu,Gd)Te MBE Layers
    Autorzy:
    Orlowski, B. A.
    Kowalski, B. J.
    Dziawa, P.
    Pietrzyk, M.
    Mickievicius, S.
    Osinniy, V.
    Taliashvili, B.
    Kowalik, I. A.
    Story, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044511.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Mq
    Opis:
    Resonant photoemission spectroscopy, with application of synchrotron radiation, was used to study the valence band electronic structure of clean surface of (EuGd)Te layers. Fano-type resonant photoemission spectra corresponding to the Eu 4d-4f transition were measured to determine the contribution of 4f electrons of Eu$\text{}^{2+}$ and Eu$\text{}^{3+}$ ions to the valence band. The resonant and antiresonant photon energies of Eu$\text{}^{2+}$ ions were found as equal to 141 V and 132 eV, respectively and for Eu$\text{}^{3+}$ ions were found as equal to 146 eV and 132 eV, respectively. Contribution of Eu$\text{}^{2+}$4f electrons was found at the valence band edge while for Eu$\text{}^{3+}$ it was located in the region between 3.5 eV and 8.5 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 803-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea ice mechanics
    Autorzy:
    Paul, Felix
    Schwarz, Carina
    Audh, Riesna Reuben
    Bluhm, J.
    Johnson, Siobhan
    MacHutchon, Keith
    Mielke, Tommy
    Mishra, A.
    Rampai, Tokoloho
    Ricken, Tim
    Schwarz, Alexander
    Skatulla, Sebastian
    Thom, Andrea
    Verrinder, Robyn
    Schröder, Jörg
    Vichi, Marcello
    Lupascu, Doru C.
    Powiązania:
    https://bibliotekanauki.pl/articles/29519762.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sea ice mechanics
    polar regions
    review
    Antarctic MIZ
    Opis:
    Earth System Models (ESM), simulating sea ice and its interaction with the atmosphere and open ocean, require reliable physical, chemical, and biological input from measurements. There is limited data available from the Marginal Ice Zone of the Antarctic, where sea ice growth mechanisms differ from the Arctic. The main objective of this study is to review existing work related to Antarctic sea ice and highlight gaps in the available literature. The mechanical properties of sea ice and the numerical modeling of sea ice across all scales are covered. We summarize the genesis, physical mechanics, static and dynamic properties, strength, toughness, and transport of young sea ice as well as medium to large scale observation. On the computational mechanics side large- and small-scale modeling, ocean-sea ice and atmosphere-sea ice models, as well as sea ice rheology models, sea ice fracture mechanics, and bio-geo-chemical interaction processes are captured. The synergy between the physical and computational mechanics brings to light missing information from both fields. Plain language summary (PLS) Sea ice determines the interaction of the ocean with the atmosphere in both the southern and northern hemispheres. Its formation and annual development is subject to mechanical interaction with ocean currents and winds. This review covers the mechanics of sea ice in the Antarctic and its relation to the Arctic covering experiment and modelling. Impact on the climate is discussed.
    Źródło:
    Computer Methods in Materials Science; 2023, 23, 3; 5-53
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-38 z 38

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