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    Wyświetlanie 1-9 z 9
    Tytuł:
    Experimental Studies of Electronic Phase Separation in High Temperature Superconductors
    Autorzy:
    Szymczak, H.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1860950.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.72.-h
    Opis:
    Experimental research on macroscopic phase separation in La$\text{}_{2}$CuO$\text{}_{4+\delta}$ superconductor and photo-doped cuprates is reviewed. It is shown that the properties of the mixed-phase state strongly depend on the shape and size of the phase domains formed during the phase separation process. The interplay of magnetic and superconducting properties in the mixed-phase state is considered in details. The mechanisms driving the phase separation in La$\text{}_{2}$CuO$\text{}_{4}$ and photo-doped materials are discussed in connection with presented experimental results.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 79-88
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Simulation and Experimental Studies of Theatres and Concert Halls
    Autorzy:
    Kamisiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537463.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.Ka
    43.55.Mc
    43.55.Br
    Opis:
    Paper presents a numerical simulation of the acoustics of selected concert halls performed using CATT-acoustic software, and the results of acoustic measurements performed in these spaces.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 78-82
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Studies on Charging Operation of a Compact Repetitive Tesla Transformer
    Autorzy:
    Zhang, Z.
    Zhang, J.
    Yang, H.
    Qian, B.
    Meng, Z.
    Li, D.
    Wang, S.
    Cao, Y.
    Zhou, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807860.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Ng
    84.30.Jc
    84.30.Qi
    84.70.+p
    Opis:
    Charging operations of a compact Tesla transformer were experimentally investigated, in single-shot and rep-rate (50 pps for 1 s) modes, respectively. The charging limitations were also explored. The experimental results were compared and analyzed. The maximum secondary charging voltages of the Tesla transformer were measured to be 380 kV and 300 kV in single-shot and rep-rate modes, respectively. The RMS pulse-to-pulse instability of the secondary charging voltage is generally less than 10% but increases with the increasing initial voltage across the primary capacitor. Since the secondary capacitor of the Tesla transformer is a pulse forming line (PFL), continued operation is possible if there is breakdown in the PFL. Furthermore, operation can even be continued under occasional breakdown for some pulses, without the effects on the operations of subsequent pulses.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 973-975
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Studies of the Elastic Enhancement Factor for 2D Open Systems
    Autorzy:
    Ławniczak, M.
    Białous, M.
    Yunko, V.
    Bauch, S.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400561.pdf
    Data publikacji:
    2015-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    We present the results of numerical and experimental studies of the elastic enhancement factor W for microwave rough and rectangular cavities simulating two-dimensional chaotic and partially chaotic quantum billiards in the presence of moderate absorption. We show that for the frequency range ν=15.0-18.5 GHz, in which the coupling between antennas and the system is strong enough, the values of W for the microwave rough cavity lie below the predictions of random matrix theory and on average above the theoretical results of V. Sokolov and O. Zhirov, Phys. Rev. E 91, 052917 (2015). We also show that for the partially chaotic rectangular billiard the enhancement factor W calculated by applying the Potter-Rosenzweig model with κ=2.8±0.5 is close to the experimental one.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 6; 974-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$
    Autorzy:
    Čizmár, E.
    Černák, J.
    Orendáč, M.
    Herrmannsdörfer, T.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013230.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    71.20.Be
    75.50.Ee
    Opis:
    In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k$\text{}_{B}$=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k$\text{}_{B}$=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Theoretical Spectroscopic Studies on Selected Igepals
    Autorzy:
    Pasterna, G.
    Kupka, T.
    Wrzalik, R.
    Pasterny, K.
    Blicharski, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014397.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    32.30.Dx
    31.15.Ar
    Opis:
    Several nonionic igepals characterized by the formula (C$\text{}_{m}$H$\text{}_{2m+1}$)-C$\text{}_{6}$H$\text{}_{4}$ (OCH$\text{}_{2}$CH$\text{}_{2}$)$\text{}_{n}$OH were investigated by high resolution NMR and IR spectroscopy. Gauge invariant atomic orbital density functional theory NMR calculations on model molecules in the gas phase additionally supported the assignment of experimental carbon signals. Different orientations of individual sub-units of an aliphatic chain relative to external magnetic field and trans-gauche transitions were assumed to explain complex patterns of carbon spectra in the aliphatic region of igepals with linear alkyl chain.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 651-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Theoretical Studies of Free and Acceptor-Bound Positive Magneto-Trions
    Autorzy:
    Bryja, L.
    Wójs, A.
    Płochocka-Polack, P.
    Gładysiewicz, A.
    Misiewicz, J.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047714.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Cn
    71.35.Ji
    73.21.Fg
    Opis:
    By combination of polarization-resolved photoluminescence, transport, and realistic numerics we study energy and recombination spectra of free and acceptor-bound positive trions in a quasi-two-dimensional hole gas. The singlet-triplet crossing in the trion ground state is found at B≈12 T, and a slight reduction of all trion binding energies coincident with the formation of a Laughlin hole fluid is observed at B≈14.2 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 415-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Studies of One-Dimensional and Three-Dimensional Chaotic Open Systems
    Autorzy:
    Ławniczak, M.
    Hul, O.
    Bauch, Sz.
    Sirko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585119.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Mt
    03.65.Nk
    Opis:
    We present the results of experimental studies of microwave irregular networks and a three-dimensional microwave rough cavity in the presence of absorption. Microwave networks are also analyzed numerically. Microwave networks simulate one-dimensional quantum graphs. The networks consist of coaxial cables connected by joints and attenuators to control absorption. Three-dimensional microwave rough cavities have no formal analog in quantum 3D systems. However, some statistical properties of their spectra such as the level spacing distribution confirms that they belong to the wave-chaotic systems. Absorption of the cavity was changed by using a foam microwave absorber.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 749-755
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Studies of Surface Roughness of Thin Epitaxial Si Films by Computer Simulations and Experimental X-Ray and Optical Methods
    Autorzy:
    Żymierska, D.
    Auleytner, J.
    Domagała, J.
    Szewczyk, A.
    Dmitruk, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964181.pdf
    Data publikacji:
    1997-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    68.35.Bs
    61.10.Dp
    Opis:
    The paper presents investigations of the surface roughness of epitaxial silicon films obtained by chemical vapour deposition with chloric and MOCVD processes. The flat surfaces of films and chemically etched surfaces of substrates were studied by optical methods as well as by X-ray reflectivity at grazing incidence. The computer simulations based on Fresnel theory were compared with the experimental results.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 5; 1025-1030
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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