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Wyszukujesz frazę "Keller, H. J." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Resonance Raman Investigations of Low Energetic Modes in the Organic Superconductors α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ and β-(BEDT-TTF)$\text{}_{2}$IAuI
    Autorzy:
    Ludwig, T.
    Schweitzer, D.
    Keller, H. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933367.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.-j
    74.70.Kn
    Opis:
    A study of low energetic modes in the resonance Raman spectra of the organic superconductors α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ (T$\text{}_{c}$ = 8 K) and β-(BEDT-TTF)$\text{}_{2}$IAuI (T$\text{}_{c}$ = 4 K) in the temperature range of 1.5-100 K was performed. In both materials, a strong vanishing of low energetic phonon bands (at 30 cm$\text{}^{-1}$ and 40 cm$\text{}^{-1}$ for α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ and at 27 cm$\text{}^{-1}$ and 33 cm$\text{}^{-1}$ for β-(BEDT-TTF)$\text{}_{2}$IAuI) below 71 was observed. For the symmetric stretching mode of the I¯$\text{}_{3}$ and the IAuI¯ anion at 120 cm$\text{}^{-1}$ no change below T, was found. In addition, wavelength dependent measurements on α-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ were performed, indicating that the modes around 30 cm$\text{}^{-1}$ are probably librational modes of the BEDT-TTF molecules.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 801-806
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$
    Autorzy:
    Balthes, E.
    Schweitzer, D.
    Heinen, I.
    Keller, H. J.
    Biberacher, W.
    Jansen, A. G. M.
    Steep, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933336.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Kn
    71.25.Hc
    71.25.Jd
    Opis:
    κ-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ is an electronically extreme two-dimensional organic metal with a superconducting transition at around 4 K. In magnetic fields above 12 T the effective mass, as obtained from the temperature dependence of the amplitudes of Shubnikov-de Haas oscillations, is magnetic field dependent as long as the magnetic field is arranged perpendicular to the conducting planes. In contrast to this, by turning the magnetic field by 27° or even only 9° the observed effective mass (as obtained from Shubnikov-de Haas and de Haas-van Alphen measurements) is field independent. We suppose that the occurrence of anyons at temperatures below 1 K in fields above 12 T is the reason for the observed field dependence of the effective mass.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 767-772
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of Thin Films of the Organic Superconductor α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$
    Autorzy:
    Moldenhauer, J.
    Wachtel, H.
    Schweitzer, D.
    Gompf, B.
    Eisenmenger, W.
    Bele, P.
    Brunner, H.
    Keller, H. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933377.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Kn
    73.50.-h
    81.15.Gh
    Opis:
    α-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ is a quasi-two-dimensional organic metal with a metal-insulator phase transition at 135 K. Thermal treatment at about 80°C leads to the metallic system α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$, which becomes superconducting below 8 K. Thin films of the α-phase (thickness between 500 and 3000 Å) have been evaporated in high vacuum onto several substrates and characterized by means of X-ray diffraction, scanning electron microscopy, atomic force microscopy and low field microwave absorption. Depending on the temperature of the substrate and the evaporation rate, the films exhibit different degrees of microcrystallinity, which under certain conditions can be strongly reduced and a completely covering film can be obtained. X-ray diffraction spectra reveal a high orientation with the c-axis perpendicular to the substrate and as well the successful conversion into the α$\text{}_{t}$-phase by tempering. Scanning electron microscopy and atomic force microscopy investigations prove that the conversion takes place without reducing the mechanical quality of the films. Low-field microwave-absorption experiments show that the α$\text{}_{t}$-films become superconducting with an onset at 9 K.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 823-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of air quality in vehicle cabins by nanoparticle filtration
    Autorzy:
    Burtscher, H.
    Mayer, A.
    Loretz, S.
    Keller, A.
    Kasper, M.
    Czerwinski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/247534.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    vehicle
    ecology
    filtration system
    nanoparticles
    Opis:
    A filter system is presented which allows the reduction of the concentration of ultrafine particles in vehicle cabins to very low levels. The original ventilation system is switched to the recirculation mode and all cabin intake air is supplied via a retrofitted filter system. Tests with a variety of different vehicles (from passenger cars to coaches) show the efficiency of the system. Filters incorporated in present ventilation systems remove large particles, for example pollen, but usually are inefficient for removing very small particles. This is demonstrated by Fig. l, where the particle number concentration outside and inside a car is plotted during a journey near Zurich. It is obvious that the concentrations inside and outside are more or less identical. All windows were closed during this measurement. Tests with a number ofdifferent all cars showed similar results. The filters included in today 's ventilation systems usually cannot remove nanoparticles, and so vehicle cabin indoor and outdoor nanoparticle concentrations are more or less identical. The nanocleaner, consisting of a very effident filter and a high performance blower, allows reduction of the particle concentration in the cabin from several hundreds of thousands or millions per cc. to a few thousand per cc., equivalent to remote woodland, the total exposed dose being reduced by some two orders of magnitude.
    Źródło:
    Journal of KONES; 2010, 17, 4; 79-88
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Air quality filtration in vehicle cabins
    Autorzy:
    Burtscher, H.
    Mayer, A.
    Loretz, S.
    Keller, A.
    Kasper, M.
    Czerwinski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/242450.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    vehicles
    nanoparticle
    cabine filtration
    Opis:
    A filter system is presented which allows the reduction of the concentration of ultrafine particles in vehicle cabins to very low levels. The original ventilation system is switched to the recirculation mode and all cabin intake air is supplied via a retro fitted filter system. Tests with a variety of different vehicles (from passenger cars to coaches) show the efficiency of the system. Number concentration of particles inside and outside a car, the nanoparticle filtration system, fllter-efficiency: transmission for the new filter and for the filter loaded to apressure drop of 2.9 mbar, setup of the filter with integrated prefilter for course particles and blower, prototype of the filter system, main filter, prefilter and blower are included the system operated by an external control box, containing the drive electronics for the blower and displays for filter pressure drop and time meter, filter pressure drop as function of operating time in a highly polluted road tunnel, a possible solution to mount the filter system, particle concentration inside and outside the car (passenger car), concentration drops to very low levels, particle concentration inside and outside a passenger car with the filter turned on, two nanocleaner filter systems mounted in a school bus, filter system for buses installed in the luggage compartment are presented in the paper.
    Źródło:
    Journal of KONES; 2009, 16, 2; 59-69
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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