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    Wyświetlanie 1-10 z 10
    Tytuł:
    Magnetic Behaviour and Electronic Structure of the R$\text{}_{2}$PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er) Compounds
    Autorzy:
    Szytuła, A.
    Hofmann, M.
    Penc, B.
    Ślaski, M.
    Majumdar, Subham
    Sampathkumaran, E. V.
    Zygmunt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013678.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    75.30.Cr
    75.30.Kz
    79.60.-i
    Opis:
    The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R$\text{}_{2}$ PdSi$\text{}_{3}$ (R = Ce, Nd, Tb-Er). In Ce$\text{}_{2}$PdSi$\text{}_{3}$ the Ce moments order below 2.5 K. The Nd magnetic moments in Nd$\text{}_{2}$PdSi$\text{}_{3}$ exhibit ferromagnetic ordering below 17 K. In Tb$\text{}_{2}$PdSi$\text{}_{3}$, a complex situation is observed: in the temperature range from 1.5 K to (T$\text{}_{N}$=25 K), there is a coexistence of a ferromagnetic spiral (about 75% of the magnetic moment) and a spin-glass (about 25%). For the Dy, Ho, and Er compounds, below T$\text{}_{N}$ (7.5, 8, and 7 K respectively), sinusoidally modulated structures are observed. The valence band and the core level photoemissions of 4d of rare-earth metal, 3d Pd, 2s and 2p Si were investigated by X-ray photoemission spectroscopy measurements.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 823-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Structures of Ho_5Rh_4Ge_{10}
    Autorzy:
    Szytuła, A.
    Penc, B.
    Hofmann, M.
    Sikora, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399030.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.-j
    75.47.Pq
    75.50.Ee
    Opis:
    A powder diffraction measurement of $Ho_5Rh_4Ge_{10}$ is reported. This compound crystallizes in the tetragonal $Sc_5Co_4Si_{10}$-type structure (space group P4/mbm) in which the Ho atoms occupy three different sites. The neutron diffraction measurements indicate antiferromagnetic order with the Néel temperature $T_{N}$=7 K. Below $T_{N}$ an additional phase transition at 4.5 K connected with the change of the magnetic structure is observed. The Ho moments in 4(h) site form collinear order up to T_{N} while moments at 2(a) site form sine modulated structure. Determined experimentally magnetic structures are compared to the results of symmetry analysis.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1002-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compensation Models in Chlorine Doped CdTe Based on Positron Annihilation and Photoluminescence Spectroscopy
    Autorzy:
    Stadler, W.
    Hofmann, D. M.
    Meyer, B. K.
    Krause-Rehberg, R.
    Polity, A.
    Abgarjan, Th.
    Salk, M.
    Benz, K. W.
    Azoulay, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934007.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    78.70.Bj
    78.55.Et
    Opis:
    In this investigation positron annihilation, photoluminescence and electron paramagnetic resonance techniques are employed to gain insight in the compensation of CdTe doped with the halogen Cl. We will demonstrate that the high resistivity of CdTe:Cl cannot be explained by the interaction between the shallow effective mass type donor Cl on Te site and the doping induced shallow acceptor complex, a Cd vacancy paired off with a nearest-neighbour Cl atom (A centre). From electron paramagnetic resonance investigations we conclude that the mid gap trap, often detected by electrical methods in CdTe, is not the isolated Cd vacancy.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 921-924
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical methods in underwater acoustics - sound propagation and backscattering
    Autorzy:
    Nolte, B.
    Ehrlich, J.
    Hofmann, H.-G.
    Schäfer, I.
    Schäfke, A.
    Stoltenberg, A.
    Burgschweiger, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331712.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    stochastic ray tracing
    German Navy
    Opis:
    This report summarizes an overview given at the XXXII Symposium on Hydroacoustics (SHA 2015) over several modelling techniques that are used in the context of military applications at the Research Department FWG of the German Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research (WTD 71). For the modelling and understanding of sound propagation a physical model consisting of a tank for scaled measurements and the corresponding numerical simulation is presented. The basic formalism of stochastic ray tracing of the German Navy sonar simulation MOCASSIN is explained and compared to traditional deterministic ray tracing including the comparison with measurements. Strategies for the approximate calculation of the sonar target strength of large underwater objects with the use of boundary element methods, fast multipole methods and a ray-based algorithm are presented and the results of the calculations of several test objects are shown.
    Źródło:
    Hydroacoustics; 2015, 18; 127-140
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluorescence Mapping of PCP Light-Harvesting Complexes Coupled to Silver Nanowires
    Autorzy:
    Krajnik, B.
    Piatkowski, D.
    Olejnik, M.
    Czechowski, N.
    Hofmann, E.
    Heiss, W.
    Mackowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419489.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kv
    42.62.Fi
    81.07.Pr
    87.64.M-
    Opis:
    In this work we demonstrate confocal fluorescence imaging of hybrid nanostructures composed of silver nanowires and peridinin-chlorophyll-protein light-harvesting complexes. The length of silver nanowires, which reaches 10 μm, allows for determination of the nanowire position and consequently direct correlation with the fluorescence image. In this way we probe the influence of plasmon induced electromagnetic field on the fluorescence of light-harvesting complexes. When the nanowires are spaced from the light-harvesting complexes by a 10 nm thick dielectric layer, we observe a fluorescence enhancement, which depends upon the laser excitation wavelength. The measured enhancement values are 2.5 and 1.9 for 405 nm and 485 nm, respectively. Larger enhancement for the 405 nm excitation is attributed to direct creation of plasmon excitations in the silver nanowires.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 259-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Plasmon Resonance in Silver Island Film on the Optical Properties of Peridinin-Chlorophyll-Protein Light-Harvesting Complexes
    Autorzy:
    Ciszak, K.
    Olejnik, M.
    Strzelecki, J.
    Krajnik, B.
    Piątkowski, D.
    Hofmann, E.
    Mackowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419506.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.Dq
    73.20.Mf
    87.15.M-
    81.07.Pr
    Opis:
    We study the effect of plasmon excitations in silver island film on the optical properties of peridinin-chlorophyll-protein light-harvesting complex using scanning fluorescence microscopy. With this technique we can unambiguously locate areas where the biomolecules are deposited on the metallic nanostructures from the areas where they stick to the glass surface. The enhancement factor of fluorescence intensity obtained for such a hybrid nanostructure is found to be 3. Plasmon excitations in the SIF layer also influence the dynamics of the emission, but in this case the interpretation of the results is more complex.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 275-278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The meteorite fall near Boumdeid, Mauritania, from September 14, 2011
    Autorzy:
    Buhl, S.
    Toueirjenne, C.
    Hofmann, B.
    Laubenstein, M.
    Wimmer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411504.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Boumdeid (2011)
    meteorite fall
    Mauritania
    trajectory scenario
    L6 chondrite
    cosmogenic radionuclides
    Opis:
    On the evening of September 14, 2011 at 21:00 GMT a bright bolide was observed by hundreds of eyewitnesses in the area north and west of the town of Kiffa, in the department of Assaba, in south Mauritania. A terminal fragmentation and sound phenomena were observed near the end point of the trajectory. At least one mass of 3.5 kg was observed to impact and recovered the morning after the fall near Boumdeid (or Bou Mdeid), around 60 km north of Kiffa. Subsequently a large number of eyewitness accounts were recorded and mapped by GPS. The present paper provides a scenario for the trajectory of the Boumdeid (2011) meteorite based on the available parameters and wind data at the relevant altitudes. In addition the paper presents the results of the mineralogical and chemical analysis of the recovered meteorite which is consistent with a classification as ordinary chondrite of type L6, shock stage S2, and a weathering grade of W0. Following its analysis and classification, the meteorite was published under the official name Boumdeid (2011) in Meteoritical Bulletin, no. 100, MAPS 49(8), (2014). Gamma ray spectroscopy was conducted 84 days after the fall and the detection of short-lived radionuclides such as 56Co and 46Sc confirmed the recency of the event. Derived from the data of 60Co, 54Mn and 22Na the approximate preatmospheric radius of the meteorite body was 10–20cm. The report is also intended to serve as a case example for post-event data recovery and trajectory reconstruction in areas not covered by sky-camera networks and with limited scientific infrastructure.
    Źródło:
    Meteorites; 2014, 3, No. 1-2; 5-18
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoconductivity Study of Sputter-Deposited $Cu_2O$ Films
    Autorzy:
    Bhattacharyya, S.
    Reppin, D.
    Sanguino, P.
    Ayouchi, R.
    Polity, A.
    Schwarz, R.
    Hofmann, D.
    Meyer, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492344.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    73.50.-h
    73.61.-r
    Opis:
    Cuprous oxide $(Cu_2O)$ thin films were deposited by radio frequency sputtering technique on fused silica substrates. The X-ray diffraction study of the $Cu_2O$ samples showed reflections from (111) and (200) planes of cubic $Cu_2O$. The samples were then annealed at 1008 K in nitrogen $(N_2)$ atmosphere. Annealed samples indicated strain relaxation. The samples were then characterized optically by measuring the transmittance using an ultraviolet-visible-near infrared photospectrometer. The band gap of the as-deposited samples were found to be ≈ 2.1 eV, whereas the annealed samples had a band gap of ≈ 2.6 eV. The transient photocurrent decay measurements of the annealed films indicated slow non-exponential power law decays in several time windows, indicating multiple trapping of the carriers in the deep defects within the band gap. The steady-state photo and dark current measurement and persistent photocurrent (PPC) was carried out on the annealed samples. In general, the photocurrent was found to be much smaller than the dark current. The steady-state and transient photocurrent measurements were utilized to determine the carrier lifetime-mobility product, 〈μτ 〉 of the samples and to determine the carrier mobility, 〈μ 〉.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-011-A-014
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of RRhGe (R = Dy and Tm) Compounds
    Autorzy:
    Bażela, W.
    Hofmann, M.
    Baran, S.
    Penc, B.
    Szytuła, A.
    Zygmunt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013666.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Kz
    75.50.Ee
    Opis:
    The magnetic properties of the ternary intermetallic RRhGe (R = Dy and Tm) were investigated by magnetic and neutron diffraction measurements. These compounds crystallize in a TiNiSi-type orthorhombic structure and are antiferromagnets with the Néel temperature 20 K (R = Dy) and 6.2 K (R = Tm). The neutron diffraction data reveal that the magnetic order in TmRhGe is collinear with the magnetic unit doubled along the b-axis respective to the crystal one.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 819-822
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GNSS-based vehicle terminal for mechanized forestry operations
    Autorzy:
    Aichhorn, K.
    Hofmann-Wellenhof, B.
    Boheim, W.
    Weimann, F.
    Vallant, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/385372.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    GPS
    GNSS
    terminal osobisty
    terminal na pojeździe
    nawigacja
    wizualizacja
    pedestrian terminal
    vehicule terminal
    navigation
    visualization
    Opis:
    The field of application for navigation tasks within forest work can mainly be divided into two sub-areas. Thus, two different mobile navigation terminals have been developed by TeleConsult Austria GmbH: - a pedestrian terminal for the use within forest inventory and in the field of manual wood harvesting, - a vehicle terminal for the optimisation of the forest logistic chain. This paper focuses on the presentation of the GNSS-based vehicle terminal for mechanized forestry operations to support and improve the forest logistic chain management. The mobile terminal is used as navigation aid and communication device mainly. The position determination of the navigation module is based on an integration of GPS and EGNOS. Due to the usage of a high sensitive GPS/EGNOS receiver with excellent satellite tracking capabilities, a continuous and reliable position determination is also possible in forest environments with limited view to the sky and weak satellite signals under dense canopy. For communication and data transfer between the vehicles and a forest office, the GSM/GPRS infrastructure is used. The display of the mobile terminal visualizes the navigation destination, general information, and the position of the own vehicle. Thus, the user is supported efficiently in guidance and navigational tasks.
    Dziedzina zastosowań zadań nawigacji w zakresie prac leśnych może być podzielona na dwie podgrupy. W firmie TeleConsult Austria GmbH, zostały opracowane dwa różne przenośne terminale. Są nimi: 1) terminal osobisty - dla wykorzystania przy inwentaryzacji lasu i ręcznej wycince drzew, 2) terminal na pojeździe - dla optymalizacji leśnych procesów logistycznych. W artykule przedstawiono terminal na pojeździe dla mechanizacji prac leśnych i ulepszenia zarządzania leśnymi pracami logistycznymi. Terminal na pojeździe jest stosowany głównie jako pomoc w nawigacji i urządzenie do komunikacji. Określenie pozycji w module nawigacyjnym jest oparte na integracji GPS i EGNOS. Dzięki zastosowaniu wysokoczułego odbiornika GPS/EGNOS, z doskonałą możliwością śledzenia satelity, ciągłe i wiarygodne określenie pozycji jest także możliwe w środowisku leśnym z ograniczoną widocznością horyzontu i słabym sygnałem z satelity pod poszyciem leśnym. Komunikacja i przesyłanie danych pomiędzy pojazdem a biurem leśnym odbywa się przy pomocy urządzenia GSM/GPRS. Display terminala na pojeździe wizualizuje ogólne informacje, punkt docelowy oraz pozycję aktualną pojazdu. Tak więc użytkownik jest efektywnie wspomagany w pracach związanych z nawigacją.
    Źródło:
    Geomatics and Environmental Engineering; 2007, 1, 1; 15-21
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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