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    Wyświetlanie 1-15 z 15
    Tytuł:
    Multifunctional, Optical Sensor for Analysis of Dynamic Pupillary Light Reflex
    Autorzy:
    Różanowski, K.
    Lewandowski, J.
    Murawski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398782.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.66.Ct
    42.30.Va
    07.05.Pj
    07.07.Df
    Opis:
    The aim of the publication is to describe the multifunctional optical sensor for analysis of dynamic pupillary light reflex developed by the authors which could be used as an objective indicator of human fatigue. The authors utilized knowledge gained from past experimental studies to develop a sensor, which along with custom software for detection of parameters of dynamic pupillary reflex provides a quick analysis of the human psychophysiological condition. Furthermore, the obtained parameters may also be utilized for medical purposes. The authors present the results of pilot studies prior to the development process of the sensory solution. The obtained result show that the type of light stimulation of the retina has a significant impact on the dynamic parameters of the pupillary reflex. The results played also an important role in shaping the structural assumptions of the sensor, so that it can serve as an indicator of the human fatigue level. The article includes results of experimental research conducted during the testing process of the sensor using various parameters of frequency light excitations, luminance and chrominance.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 723-729
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stationary Properties of Superconducting Interferometers
    Autorzy:
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892080.pdf
    Data publikacji:
    1991-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    85.25.Dq
    Opis:
    A generalized superconducting interferometer, comprising a parallel arrangement of (lumped) inductances and series (lumped) Josephson junctions is considered. Such a system can be seen as the building block of a simplified model of a high-T$\text{}_{c}$ superconductor with its haphazard distribution of Josephson weak links on grain boundaries and lattice defects. It is shown that the system properties can be self-consistently derived from a properly defined potential energy function, taking account of the energies of the system, its current source and external magnetic field. In particular, by solving a stationary problem for this function relative to conditions of constant current bias and constant magnetic flux applied to the system, the critical current of the interferometer can be determined in function of the applied flux. Stationary phase relations and their impact on other system variables are discussed in detail. The theory is applied to the simplest possible system exhibiting all discussed properties, i.e. an interferometer composed of two junctions in series and one junction in parallel.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 6; 841-856
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Dimensional Behavior of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ Films on SrTiO$\text{}_{3}$ Substrates
    Autorzy:
    Mikheenko, P. N.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964342.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Dh
    74.76.-w
    74.80.-g
    74.80.Dm
    Opis:
    Long-term (up to 18 months) degradation of textured YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ films prepared by laser ablation and magnetron sputtering on single crystal SrΤiO$\text{}_{3}$, MgO and Al$\text{}_{2}$O$\text{}_{3}$ substrates were investigated. All films at each stage of exposition displayed a clearly visible quasi-2D behavior. From the measurements of the Kosterlitz-Thouless temperature it could be concluded that the oxygen content and density of charge carriers remained constant. It follows that the main consequence of degradation is the omission of some planes from the transport of supercurrent and the samples could be described in the model of layered structure with variable number of conducting planes. Using this model we find that effective thickness of an isolated CuO$\text{}_{2}$ plane in samples with greatest internal damage is ≈2Å.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 152-156
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the Josephson Multi-Junction Systems with Junctions Characterized by Non-Sinusoidal Current - Phase Relationship
    Autorzy:
    Abal'osheva, I. S.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041445.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    85.25.Am
    85.25.Dq
    Opis:
    It is shown that the inclusion of junctions characterized by non-sinusoidal current - phase relationship in the systems composed of multiple Josephson junctions - results in the appearance of additional system phase states. Numerical simulations and stability considerations confirm that these phase states can be realized in practice. Moreover, spontaneous formation of the grain boundary junctions in high-T$\text{}_{c}$ superconductors with non-trivial current-phase relations due to the d-wave symmetry of the order parameter is probable. Switching between the phase states of multiple grain boundary junction systems can lead to additional 1/f noise in high-T$\text{}_{c}$ superconductors.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 687-691
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Negative Magnetoresistance of Layered High-t$\text{}_{c}$ Compounds
    Autorzy:
    Medvedev, Yu. V.
    Yampolskii, S. V.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011093.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Jt
    74.80.Dm
    Opis:
    Magnetoresistance of layered high-T$\text{}_{c}$ systems with quasi-two-dimensional superconductivity in magnetic field H applied parallel to superconducting planes was investigated theoretically. In such configuration an increase in the magnetic field intensity decreases the critical temperature of superconducting regions. It causes both a suppression of the gap parameter Δ and an increase in the tunneling current between the decoupled superconducting planes and, as a consequence, leads to negative magnetoresistance. The dependence of tunneling current on H was calculated for superconducting layer thickness d$\text{}_{S}$ smaller than the superconducting correlation length. The results can be used for analysis of current-voltage characteristics of both superconductor-insulator-superconductor and superconductor-insulator normal metal multilayered tunnel structures.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 501-504
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Characterization of Films Formed by Pulsed Laser Deposition on Cold Substrates from YBaCuO Targets
    Autorzy:
    Pełka, J. B.
    Paszkowicz, W.
    Gierłowski, P.
    Lewandowski, S. J.
    Zieliński, M.
    Barbanera, S.
    Knapp, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030707.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.Mf
    81.15.-z
    68.55.-a
    Opis:
    Grazing-incidence X-ray diffraction supplemented with atomic force microscopy and secondary ion mass spectroscopy were applied to the characterization of films deposited by laser ablation on cold substrates from YBaCuO targets and subsequently irradiated with additional laser pulses of lower energy density. Evolution of X-ray diffraction pattern was observed as a function of irradiation dose. For the as-deposited films the pattern was typical of the amorphized solids. For the films irradiated with doses higher than the threshold, the pattern was enriched with the diffraction peaks, whose general features, like peak positions, widths and relative intensities were almost independent of the dose. The size of the crystallites was deduced from the peak widths to be not smaller than 12-16 nm. Comparison of the pattern with patterns of known phases indicates that, apart of the amorphous component, a structure with an admixture of some new metastable or high temperature phase(s) is formed during the process of pulsed laser annealing. The atomic force microscopy observations revealed that the surface roughness shows a pronounced minimum at low irradiation doses. The secondary ion mass spectroscopy investigation confirms that the strongest chemical changes (increase in concentration of yttrium and copper) due to irradiation with higher doses are observed in the near-surface film material.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 787-794
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling Conductivity of Manganites with Negative Magnetoresistance
    Autorzy:
    Medvedev, Yu. V.
    Tarenkov, V. Yu.
    Svistunov, V. M.
    Abaloshev, A. V.
    Abalosheva, I. S.
    Lewandowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013683.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Pa
    Opis:
    Tunneling investigations of ferromagnetic La$\text{}_{0.6}$Sr$\text{}_{0.4}$MnO$\text{}_{3}$ ceramic samples showing negative magnetoresistance effect were carried out in two types of junctions: symmetric "break junctions" and asymmetric ceramics-insulator-metal junctions. The results are consistent with the presence of small ferromagnetic clusters in the insulating barriers of both types of junctions and suggest a two-phase state realized by impurity mechanism of phase separation.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 827-830
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Transport and Magnetic Properties of La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Thin Films
    Autorzy:
    Baran, M.
    Berkowski, M.
    Fink-Finowicki, J.
    Lewandowski, S. J.
    Szymczak, H.
    Szymczak, R.
    Khartchev, S. I.
    Medvedev, Yu. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037109.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    72.15.Gd
    75.70.Pa
    Opis:
    The magnetic and transport properties of epitaxial La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ CuO$\text{}_{3}$ thin films deposited on SrLaGaO$\text{}_{4}$ substrate using dc magnetron sputtering technique are reported. The giant magnetoresistance effect (of about 50% at magnetic field of 1 T) was observed near the Curie temperature. Several mechanisms responsible for temperature dependence of resistivity are discussed. The effect of annealing was studied. It shifted the Curie temperature to the lower value, probably, because of the loss of oxygen.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 115-120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Excimer Laser Irradiation Effects on Properties of Crystalline YBaCuO Thin Films
    Autorzy:
    Abal'oshev, A.
    Abal'osheva, I.
    Lewandowski, S. J.
    van der Beek, C. J.
    Konczykowski, M.
    Rizza, G.
    Barbanera, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038396.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Fy
    74.72.Bk
    74.78.Bz
    81.15.Fg
    Opis:
    The influence of UV laser irradiation on the physical properties of epitaxial YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ thin (<1μm) films fabricated by laser ablation was studied. The samples were irradiated by pulsed excimer laser beam at different incident energy densities E$\text{}_{ir}$≤130 mJ/cm$\text{}^{2}$, i.e. 2-3 times below the ablation threshold of YBaCuO. The analysis of the sample cross-section using transmission electron microscope shows that such irradiation forms a disordered layer on the top of the crystalline film. Sample surface amorphization was observed also by atomic force microscope. Due to strong UV irradiation absorption in YBaCuO this surface layer acts like a protective cover for the sample interior. Only a small reduction of superconducting critical temperature T$\text{}_{c}$ was observed. Both transport measurements in normal state and magneto-optical studies in superconducting state indicate that between the disordered layer and the bottom non-modified part of the film there exists a wide transitional region with reduced carrier concentration.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 681-685
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mesoscopic Ordering Effects in Single-Crystalline Thin Films of Lanthanum Manganites
    Autorzy:
    Samoilenko, Z. A.
    Okunev, V. D.
    Pushenko, E. I.
    Abal'oshev, A.
    Baran, M.
    Gierłowski, P.
    Lewandowski, S. J.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037100.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    We have investigated thin films of lanthanum manganites epitaxially grown by pulsed laser deposition on single-crystalline substrates. X-ray diffraction studies show that the characteristic feature of the investigated films is a superposition of fractions with long range atomic order in the basic single-crystalline matrix, and mesoscopic order in the clusterized structure encompassing the Mn-O layers. A detailed analysis of diffusive scattering shows that the size of metallic clusters and their volume concentration in the dielectric matrix varies. In the case of a small size and concentration, the metallic clusters in low temperature behave as quantum dots and their presence leads to a tunneling mechanism of conductivity with characteristic R(T)= const. In the case of large cluster size, the discrete energy levels become smeared. It appears also that the optical, transport, and magnetic properties of the investigated films depend critically on the distribution of Mn$\text{}^{2+}$, Mn$\text{}^{3+}$, and Mn$\text{}^{4+}$ ions in the clusters.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 93-98
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Order and the Interaction of Electronic and Magnetic Subsystems in Epitaxial LaSr(Ca)MnO Films
    Autorzy:
    Okunev, V. D.
    Samoilenko, Z. A.
    D'yachenko, T.
    Abal'oshev, A.
    Baran, M.
    Gierłowski, P.
    Lewandowski, S. J.
    Szewczyk, A.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037110.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.47.Lx
    61.50.Ks
    Opis:
    We have investigated the structure, and electric, optical, and magnetic properties of LaSr(Ca)MnO films containing atomic clusters of various types coherently built into the basic crystallographic matrix. Below the transition to the metallic state, the electrical conductivity of the films is determined by tunneling of charge carriers between metallic clusters. We have found that for each sample there exists a threshold value of magnetic ordering, above which the magnetic subsystem starts to affect actively the film conductivity. The observed increase of conductivity with decreasing temperature is caused by the fact that in the process of magnetic ordering of the samples the cluster size and concentration of metallic phase increase. Experimental results are in agreement with theoretical calculations.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 121-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidation Kinetics of Thin and Ultrathin Fe Films
    Autorzy:
    Marczyńska, A.
    Skoryna, J.
    Lewandowski, M.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387032.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    We have studied oxidation kinetics of Fe thin films under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are practically nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in ferromagnetism. Fe thin films were deposited onto 1.5 nm V thick buffer layer using UHV magnetron sputtering. As a substrate we have used Si(100) wafers with an oxidised surface. Results show that all samples with an initial Fe thickness greater than 6 nm oxidize practically instantaneously, whereby a constant amount of 2.5 nm of metal is transformed into oxides. For iron thickness lower than 6 nm the time constant for oxidation increases considerably reaching a value of 30 days for the initial Fe thickness equal to 4 nm.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 549-551
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Visible Light Emission from Porous Silicon
    Autorzy:
    Bugajski, M.
    Wesołowski, M.
    Lewandowski, W.
    Ornoch, J.
    Kątcki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924257.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.65.-s
    Opis:
    The aim of this paper is the study of porous Si prepared by preferential anodic dissolution in concentrated HF acid solutions. Porous silicon layers exhibited extremely efficient luminescence in the 700-900 nm range at room temperature. Basic characteristics of this luminescence strongly suggest the intrinsic origin of the process, directly related to quantum confinement. The additional transmission-electron-microscopy and electron-diffraction studies - were performed to support hypothesis that luminescence originates from silicon nanostructures.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 914-918
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semiconductor Superlattices with Small Band Offsets - feature article
    Autorzy:
    Yang, G.
    Lewandowski, L. A.
    Furdyna, J. K.
    Ram-Mohan, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968871.pdf
    Data publikacji:
    1998-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    Opis:
    Optical transitions in small band offset superlattices are studied within the framework of the nearly free electron approximation, in which the weak superlattice potential is treated as a perturbation. Interband selection rules are derived for transitions involving conduction and valence band states at the superlattice Brillouin zone center and the zone edge. It is found that a number of new transitions can occur in such small-offset superlattices due to wave function mixing of different subband states. The effect of the effective mass on the optical transitions is also discussed. The theory is used to explain the results observed in magneto-optical absorption experiment in ZnSe/Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se small-offset superlattices. Furthermore, the nearly free electron formulation is found to be in excellent agreement with rigorous multi-band numerical calculation on superlattices involving small band offsets.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 4; 567-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Bragg and Polarimetric Optical Fiber Sensors for Stress Monitoring in Composite Materials
    Autorzy:
    Domanski, A.
    Lesiak, P.
    Milenko, K.
    Budaszewski, D.
    Chychlowski, M.
    Ertman, S.
    Tefelska, M.
    Wolinski, T.
    Jedrzejewski, K.
    Lewandowski, L.
    Jasiewicz, W.
    Helsztynski, J.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795792.pdf
    Data publikacji:
    2009-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    62.23.Pq
    Opis:
    Composite structures are made of two or more components with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows for introducing optical fiber sensors into the composite material. These sensors can demonstrate stress distribution inside tested material influenced by external tensions. Two types of the optical fiber sensors are used as the 3D structure. One of them is based on application of fiber Bragg grating inside the core of the fiber. Longitudinal stress changes parameters of the Bragg grating and simultaneously, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which, under external stress, introduce polarization changes of the output light.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 3; 294-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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