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    Wyświetlanie 1-13 z 13
    Tytuł:
    Exchange Coupled Double Layers for Magneto-Optical Applications
    Autorzy:
    Becker, S.
    Rohrmann, H.
    Roell, K.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953155.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ch
    42.79.Vb
    78.20.Ls
    75.70.-i
    Opis:
    Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 55-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of Pt/CeO$\text{}_{x}$ systems for catalytic CO oxidation reaction
    Autorzy:
    Wróbel, R.
    Łagonda, S.
    Narkiewicz, U.
    Pełech, R.
    Becker, S.
    Szymaszkiewicz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2080016.pdf
    Data publikacji:
    2011-01-01
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    Four different ceria supported catalyst were prepared by impregnation method with Pt(NO$\text{}_{3}$)$\text{}_{2}$ solution. The two supports are commercially available (MaTeck) and the other two were prepared by precipitation and microwave assisted hydrothermal method (MAH) respectively. The phase composition and average crystallite size of the catalysts were characterised with XRD technique. Finally the catalytic activity in CO oxidation reaction were determined in plug flow reactor in temperature range 300-900 K with 1 K resolution. The catalysts obtained in both precipitation and MAH methods exhibit catalytic activity at room temperature whereas catalysts obtained on MaTeck supports are not active at those conditions. In turn, catalysts based on MaTeck support are more active in temperature range 420-700 K. The different activities are attributed to difference in average crystallite sizes and in support morphology.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2011, 66; 37-46
    2083-358X
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Chemistry of Zirconia Nanopowders Doped with $Pr_2O_3$: an XPS Study
    Autorzy:
    Suchorski, Y.
    Wrobel, R.
    Becker, S.
    Opalińska, A.
    Narkiewicz, U.
    Podsiadly, M.
    Weiss, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811498.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    61.46.-w
    61.46.Hk
    Opis:
    Zirconia nanopowders of tetragonal crystallographic structure doped with $Pr_2O_3$ were prepared by the microwave-assisted hydrothermal synthesis and coprecipitation method. The surface compositions were studied by X-ray photoelectron spectroscopy. The nanopowder particles appear to be inhomogeneous in their structure: for the surface region an enrichment with praseodymium is detected by X-ray photoelectron spectroscopy measurements. This allows the assumption of a core-shell-like structure of single nanopowders particles. The X-ray photoelectron spectroscopy studies confirm also $Zr^{4+}$ and $Pr^{3+}$ as main oxidation states of zirconium and praseodymium in the studied compounds.
    Źródło:
    Acta Physica Polonica A; 2008, 114, S; S-125-S-134
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New upper Givetian to basal Frasnian conodont faunas from the Tafilalt (Anti-Atlas, Southern Morocco)
    Autorzy:
    Aboussalam, Z.S.
    Becker, R.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059516.pdf
    Data publikacji:
    2007
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Morocco
    Frasnes Event
    Givetian
    Frasnian
    conodont taxonomy
    conodont biostratigraphy
    Opis:
    Conodont faunas, mostly from previously unsampled sections of the Tafilalt (eastern Anti-Atlas, Morocco) and spanning the upper Givetian to basal Frasnian, include first records of species for the region and NW Gondwana as well as new taxa: "Ozarkodina" maroccanica n. sp., Polygnathus aequidivisus n. sp., Po. dengleri sagitta n. ssp., Po. jorfensis n. sp., Po. saevus n. sp., Po. tafilensis n. sp., and Schmidtognathus longicavus n. sp. The morphology of Tortodus subsymmetricus n. sp. suggests relation ships of Tortodus with Frasnian ancyrognathids. Other taxa are described in open nomenclature: Po. cristatus n. ssp., Icriodus aff. I. symmetricus, Skeletognathus aff. Sk. norrisi, and enigmatic supposed Pb elements (Gen. et sp. indet.). Ctenopolygnathus lanei Kuzmin (1995) is emended and distinctive morphotypes are recognized in Ct. angustidiscus and Po. collieri. Mesotaxis falsiovalis Sandberg et al. (1989) is a subjective junior synonym of the widely over looked M. guanwushanensis (Tian, 1988). There vised regional lithostratigraphy and conodont sequences allow to refine the upper Givetian zonation. The former Upper disparilis Zone is subdivided into succes sive Po. dengleri sagitta and Po. dengleri dengleri subzones. The basalmost Frasnian Ancyrodella rotundiloba pristina Zone (= MN 1 Zone) is preserved as a thin, condensed lime stone just at one locality (Bine Jebilet). The over lying Frasnes Event Beds (Lower Styliolinites) seem to fall in the subsequent Ad. rotundiloba soluta Zone (MN 2 Zone). Records of rare taxa, such as Po. paradecorosus, Po. Pollocki Morphotype 1, old est Po. webbi, Ct. angustidiscus, and Ct. lanei may be help ful for correlation into distant areas or shallower facies.
    Źródło:
    Geological Quarterly; 2007, 51, 4; 345-374
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical in situ Study of Reduction/Oxidation Processes in Cr,Mg:YAG Epitaxial Film
    Autorzy:
    Buryy, O.
    Ubizskii, S.
    Syvorotka, I.
    Becker, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550540.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Cc
    66.30.Dn
    66.30.hd
    78.30.Hv
    78.40.Ha
    Opis:
    The changes of the optical absorption spectra of Cr,Mg:YAG epitaxial film caused by high-temperature redox treatment are investigated by means of in situ spectroscopy. The spectra were registered in the visible and near-IR spectral regions at temperatures up to 1100 K. The kinetics of optical absorption changing were obtained in the temperature range from 936 K to 1091 K and were described by mathematical model connecting the chromium recharging process with oxygen vacancies diffusion. The parameters of the model were determined from the approximations of the experimental kinetics.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 184-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study by modeling and simulation of open-switch fault diagnosis for five-level converters
    Autorzy:
    Becker, F.
    Jamshidpour, E.
    Poure, P.
    Saadate, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/136241.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    open switch fault
    fault diagnosis
    fault detection
    fault localization
    Multilevel converter
    neutral point
    H-bridge
    Opis:
    In this paper, an open-switch fault diagnosis method for five-level H-Bridge Neutral Point Piloted (HB-NPP) or T-type converters is proposed. While fault tolerant operation is based on three steps (fault detection, fault localization and system reconfiguration), a fast fault diagnosis, including both fault detection and localization, is mandatory to make a suitable response to an open-circuit fault in one of the switches of the converter. Furthermore, fault diagnosis is necessary in embedded and safety critical applications, to prevent further damage and perform continuity of service. In this paper, we present an open-switch fault diagnosis method, based on the switches control orders and the observation of the converter output voltage level. In five-level converters such as HB-NPP and T-type topologies, some switches are mostly 'on' at the same time. Therefore, the fault localization is quite complicated. The fault diagnosis method we proposed is capable to detect and localize an open-switch fault in all cases. Computer simulations are carried out by using Matlab Simulink and SimPowerSystem toolbox to validate the proposed approach.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 1; 27-34
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular Differential Cross-Sections for Electron Transfer in Collisions between Proton and He$\text{}^{+}$(1s) Ions
    Autorzy:
    Bhattacharyya, S.
    Pathak, K.
    Becker, A.
    Faisal, F. H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952747.pdf
    Data publikacji:
    1996-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.70.+e
    34.40.+n
    Opis:
    Angular differential cross-sections for the formation of H, as a result of electron capture by proton from He$\text{}^{+}$(1s) at the centre-of-mass energies from 4 to 24 keV, are calculated using distorted wave Coulomb-Born approximation. The total interaction potentials in the prior-interaction channel and in the post-interaction channel are considered. Coulomb boundary conditions are taken care of with the proper choice of the perturbation potentials in both the prior and the post channels. A prior-post discrepancy is noted. Existing theoretical results are presented along with the present results.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 6; 1143-1153
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a high-resolution real-time-capable 3D SONAR camera for deep sea operation
    Autorzy:
    Ehrhardt, M.
    Becker, F. J.
    Speicher, D.
    Fonfara, H.
    Hewener, H.
    Degel, C.
    Tretbar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/332135.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    2D array
    matrix array
    3D imaging
    beamforming
    Opis:
    Within this work we present a first experimental setup of a high-resolution real-timecapable 3D sonar camera system for deep sea operation. Since we are currently in the development process, the focus of this work is on the transmission aspects of the camera. Following publications will include the receiving aspects as well as the first phantom reconstructions. The system consists of a 1024 element matrix array antenna, together with a 128 channel beamforming system including a 1:8 multiplexing device for each channel. The camera is supposed to deliver volumetric images within a range of up to 15 m in a deep sea environment up to 6000 m depth. The antenna provides the advantage of an adjustable defocused transmitting sound field. This allows dynamic control of the field of view, and an increase of the image contrast for a specific region.
    Źródło:
    Hydroacoustics; 2016, 19; 101-110
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In situ Investigation of $OH^{-}$ Absorption in $LiNbO_{3}$ and $LiNbO_{3}:MgO$ Crystals during Reducing/Oxidizing Annealing
    Autorzy:
    Sugak, Yu.
    Sugak, D.
    Zhydachevskii, Ya.
    Solskii, I.
    Buryy, O.
    Ubizskii, S.
    Becker, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550507.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Mp
    78.30.-j
    77.84.-s
    Opis:
    The work presents experimental results of an in situ investigation of the $OH^{-}$ absorption in pure and MgO-doped $LiNbO_{3}$ crystals during reducing (95% Ar + 5% $H_{2}$) and oxidizing $(O_{2})$ high-temperature treatments in the temperature range from room temperature to 820 K. The absorption spectra measured in situ at high temperatures in reducing/oxidizing atmospheres have been analyzed. The origin of the changes in optical absorption caused by heating of the crystal is discussed in terms of the OH-bonds orientation change.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 170-173
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model koncepcyjny systemu hydrogeologicznego obszaru oddziaływania Lubińsko-Głogowskiego Obszaru Miedzionośnego (LGOM)
    Conceptual model of hydrogeological system of Lubin-Głogów Ore District impact area
    Autorzy:
    Staśko, S.
    Gurwin, J.
    Wcisło, M.
    Modelska, M.
    Kryza, H.
    Kryza, J.
    Olichwer, T.
    Buczyński, S.
    Tarka, R.
    Wąsik, M.
    Becker, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2062565.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    modelowanie numeryczne
    model hydrogeologiczny
    model koncepcyjny
    kopalnie głębinowe
    drenaż kopalniany
    numerical modelling
    groundwater model
    conceptual model
    deep mine
    mine drainage
    Opis:
    W Instytucie Nauk Geologicznych Uniwersytetu Wrocławskiego opracowano numeryczny model hydrogeologiczny 3D (regionalny), uwzględniający strefę oddziaływania górnictwa rud miedzi LGOM. Stworzony i przetestowany szczegółowy model hydrogeologiczny obejmuje swym zasięgiem powierzchnię 3049 km2, w tym obszary górnicze KGHM Polska Miedź (650 km2). Zbudowany model ma za zadanie przeprowadzenie weryfikacji struktury hydrogeologicznej, rozpoznanie i ustalenie danych ilościowych systemu krążenia wód podziemnych, określenie zmian warunków przepływu wód podziemnych w trakcie prowadzonej eksploatacji złoża a w konsekwencji ustalenie bilansów wód podziemnych modelowanych poziomów wodonośnych oraz ocenę ilościową dopływów kopalnianych na podstawie uzyskanego odwzorowania hydrodynamiki systemu. W efekcie końcowym uaktualniany model posłuży do wykonania symulacji prognostycznych w nawiązaniu do przewidywanego rozwoju obszarów wyrobisk górniczych. W artykule przedstawiono model koncepcyjny systemu hydrogeologicznego badanego obszaru. Stanowił on zakończenie wstępnych etapów prac oraz podstawę przy konstruowaniu modelu numerycznego.
    3D numerical hydrogeological regional model has been developed in the Institute of Geological Sciences, University of Wrocław. The model takes into account the impact zone of copper ore mines Lubin-Głogów Ore District (LGOM). Detailed hydrogeological model has been created and tested covered area of 3049 km2 (in this the mining areas KGHM covered 650 km2). Built model is designed to verify hydrogeological structure, identification and determination of groundwater circulation system, to determine changes in groundwater flow during exploitation of the deposit. As a result developed model can determine groundwater balance and groundwater inflow to the mine based on the obtained image hydrodynamics of the system. In the end, updated model will be used to simulate the prognosis in relation to the anticipated development of mine workings.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2012, 451 Hydrogeologia z. 13; 203--210
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Defects Introduced by Irradiation with 4-9 MeV Helium Ions on Impedance of Silicon Diodes
    Autorzy:
    Poklonski, N.
    Gorbachuk, N.
    Nha, Vo
    Shpakovski, S.
    Filipenya, V.
    Skuratov, V.
    Kołtunowicz, T.
    Kukharchyk, N.
    Becker, H.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402222.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    61.80.Fe
    Opis:
    Silicon diodes irradiated with helium ions with energies of 4.1, 6.8 and 8.9 MeV are studied. It is shown that the mechanism determining the behaviour of frequency dependence of complex electric module and correspondingly the behavior of impedance of diodes irradiated with helium ions in the frequency region 3-200 kHz is a recharging of vacancy complexes localized in the space charge region.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 891-893
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties and Microstructure of InGaN Grown by Molecular Beam Epitaxy
    Autorzy:
    Böttcher, T.
    Einfeldt, S.
    Figge, S.
    Kirchner, V.
    Hommel, D.
    Selke, H.
    Ryder, P. L.
    Bertram, F.
    Riemann, T.
    Christen, J.
    Lunz, U.
    Becker, C. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969025.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Dv
    68.65.+g
    78.20.-e
    78.55.-m
    78.55.Cr
    Opis:
    The luminescence of In$\text{}_{x}$Ga$\text{}_{1-x}$N is studied for thick epitaxial layers and quantum wells. Using spatially resolved cathodoluminescence spectroscopy the commonly observed broad integral photoluminescence spectra were found to result from spectral and lateral inhomogeneous emission across the samples. Moreover, the integral photoluminescence and absorption spectra show different temperature dependences. The effects can be explained assuming fluctuations of the composition associated with a variation of the band gap.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 260-264
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of CEGRN 2005 as the eighth of CERGOP observing campaigns
    Autorzy:
    Hefty, J.
    Gerhatova, L.
    Stangl, G.
    Haslinger, C.
    Krauss, S.
    Becker, M.
    Drescher, R.
    Grenerczy, G.
    Kratochvil, R.
    Liwosz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/224554.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    CERGOP
    CEGRN
    obserwacje geodezyjne
    Central European Regional Geodynamic Project
    geodetic observation
    Opis:
    Strategy of analysis and results from solution of CEGRN epoch campaign in 2005 Combined solution of CEGRN 2005 based or individual solutions from six an: centres and its comparison with CEGRN 2003 coordinates. Time evolution of coordinates at some long-term observed CEGRN sites obtained during epoch camp since 1994 and the related problems.
    Źródło:
    Reports on Geodesy; 2006, z. 1/76; 39-46
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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