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    Wyświetlanie 1-10 z 10
    Tytuł:
    Multilayer Neutron Mirrors and Their Applications
    Autorzy:
    Kawai, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010966.pdf
    Data publikacji:
    1999-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.60.-j
    Opis:
    The purpose of this report is to talk, in an instructive way, about multilayer neutron mirrors and their applications developed in our institute. The outline is as follows. Basic properties and the reflectivity of the multilayer neutron mirror are given. The applications of the multilayer neutron mirrors, i.e., multilayer neutron monochromators, multilayer neutron polarizers, supermirrors, are presented. Measuring methods of the reflectivity and the polarization are secondly reported.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 1; 19-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux
    Autorzy:
    Sametoglu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504597.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.15.Eq
    07.60.-j
    06.20.F-
    07.60.Dq
    Opis:
    A two-axis goniophotometer is constructed at National Metrology Institute of Turkey (TUBITAK UME) for characterizing photometric properties of compact light sources. With the new device, total luminous flux emitted by a light source at both cap-up or cap-down mounting positions is calculated from the integration of the illuminance values E( θ, φ) measured on the goniometric spherical surface. The internal calibration of the system is performed by means of two calibrated light sources with known luminous flux values. The constructed system is also capable of measuring the luminous intensity distribution values I( θ, φ) of compact light sources. The uncertainty analyses of the luminous flux measurements as well as the internal calibration of the instrument are also presented herein.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 783-791
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency Domain Optical Coherence Tomography Techniques in Eye Imaging
    Autorzy:
    Wojtkowski, M.
    Kowalczyk, A.
    Targowski, P.
    Gorczyńska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035626.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.30.Wb
    42.66.Ew
    42.66.-p
    07.60.-j
    07.60.Ly
    Opis:
    This contribution presents an application of frequency-domain optical tomography to ophthalmology. Essential theoretical foundations of time-domain and frequency-domain optical tomography are presented. Images of sections through the anterior chamber, the corneo-scleral angle and fundus of the eye are reconstructed from the spectral fringes. The morphological information gained by tomograms is important for diagnosing and planning of a treatment of glaucoma.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 739-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real Time Imaging of Propagating High Field Domains in Semi-Insulating GaAs
    Autorzy:
    Piazza, F.
    Christianen, P. C. M.
    Maan, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933946.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Jq
    78.47.+p
    07.60.-j
    72.20.Ht
    Opis:
    With a newly developed technique, we measure voltage, electric field and charge distribution of high field domains in semi-insulating GaAs under high electric bias. Based on these new quantitative data resolved in time and space, which are synchronized with the current pulses, we confront the generally accepted model which explains the domain formation with field enhanced trapping from EL2.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 865-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2×2 MIMO VLC optical transmission system based on LEDs in a double role
    Autorzy:
    Kowalczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065670.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.50.Qx
    07.60.-j
    42.72.Bj
    42.79.-e
    42.82
    Opis:
    The article presents the concept solution of two main issues of visible light communication systems, i.e. the lack of a cost-effective feedback channel and the handling of high throughput. The concept is based on merging of the multiple input multiple output approach, well-known from radio transmission domain, with using of LEDs in a double role, i.e. both as emitters and detectors of light. The feasibility of the proposal was confirmed by the results of the research, carried out for two-channel system of this type.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 41-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Transition, Excitation, and Emission Properties of Poly(N-Vinlycarbazole) Blended with Poly(Vinylidene Fluoride-co-Hexafluoropropene) and Polyvinylpyrrolidone
    Autorzy:
    Alias, A.
    Zabidi, Z.
    Harun, M.
    Yahya, M.
    Ali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401283.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.60.-j
    31.15.bu
    81.05.Lg
    82.35.Lr
    Opis:
    We present the results concerning the excitation and emissions spectra of poly(N-carbazole) (PVK) blended with poly(vinylidene fluoride-co-hexafluoropropene), (PVDF-HfP) and polyvinylpyrrolidone (PVP). Thin films of PVK blended with PVDF-HfP (PVK:PVDF-HfP) and PVP (PVK:PVP) were prepared using doctor blade technique on spectrosil substrate. The influences of polymer blends to the excitation and emission spectra were observed under UV excitation source of a xenon lamp. The result shows a discrepancy in the maximum excitation and emission for each samples. The possible energy transfer and recombination mechanisms have been related with singlet-singlet semi-empirical INDO electronic calculation and FTIR measurements.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1075-1078
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Transition, Excitation, and Emission Properties of Poly(N-Vinlycarbazole) Blended with Poly(Vinylidene Fluoride-co-Hexafluoropropene) and Polyvinylpyrrolidone
    Autorzy:
    Alias, A.
    Zabidi, Z.
    Harun, M.
    Yahya, M.
    Ali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401439.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.60.-j
    31.15.bu
    81.05.Lg
    82.35.Lr
    Opis:
    We present the results concerning the excitation and emissions spectra of Poly (N-carbazole) (PVK) blended with poly(vinylidene fluoride-co-hexafluoropropene), (PVDF-HfP) and polyvinylpyrrolidone (PVP). Thin films of PVK blended with PVDF-HfP (PVK:PVDF-HfP) and PVP (PVK:PVP) were prepared using doctor blade technique on spectrosil substrate. The influences of polymer blends on the excitation and emission spectra were observed under UV excitation source of a xenon lamp. The result shows a discrepancy in the maximum excitation and emission for each sample. The possible energy transfer and recombination mechanisms have been related with singlet-singlet semi-empirical INDO electronic calculation and FTIR measurements.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1430-1433
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of ZnSe Nanolayers by Spectroscopic Ellipsometry
    Autorzy:
    Šćepanović, M.
    Grujić-Brojčin, M.
    Nesheva, D.
    Levi, Z.
    Bineva, I.
    Popović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795712.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.15.-z
    81.05.Dz
    78.30.-j
    07.60.Fs
    68.55.-a
    Opis:
    Single layers of ZnSe with thicknesses of 30, 40, 50, 70 and 100 nm are deposited at room substrate temperature by thermal evaporation of ZnSe powder in vacuum. The layers surface morphology has been investigated by atomic force microscopy. Structural characterization by the Raman scattering measurement revealed the existence of randomly oriented crystalline ZnSe particles in all layers, and the presence of amorphous phase in layers thinner than 100 nm. The ellipsometric measurements were performed in the range from 1.5 to 5 eV at room temperature in air. To interpret the experimental results, the Bruggeman effective medium approximation of dielectric function of ZnSe layers has been used, representing the layers as different mixtures of crystalline ZnSe (c-ZnSe), amorphous ZnSe (a-ZnSe), and voids. The assumption of polycrystalline ZnSe layers modeled as mixture of porous c-ZnSe (with volume fraction of voids ≈ 0.17) and a-ZnSe gives the best fit of ellipsometric experimental data. Single layer thicknesses similar to those expected from preparation conditions have been obtained by this fitting procedure. It has been also found that decrease in the layer thickness causes an increase of the volume fraction of a-ZnSe. Thus, c-ZnSe/a-ZnSe ratio, porosity and layer thickness obtained by spectroscopic ellipsometry, provides useful information about crystallinity and micro-/nanostructure of ZnSe nanolayers.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 708-711
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Nonlinear Dynamics of Nanotube Cores Driven by Interlayer Dispersion Force Modulation: New Developments and Future Applications
    Autorzy:
    Pinto, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191757.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.20.Pe
    84.60.Ve
    85.85.+j
    42.50.Pq
    34.20.Cf
    Opis:
    Despite several past proposals to employ the inner cores of multiwalled nanotubes as, among others, ultra-high-frequency oscillators, memory devices, and nano-scale sensors, driving into motion a mass initially at rest within the nanotube outer walls has remained a crippling practical obstacle. In addition to the challenge of applying an external driving force upon the entirely embedded shuttle, it has been reported that the dynamics of such motion is "truly nonlinear", that is, it cannot be reduced to that of harmonic or nearly-harmonic oscillators even in the case of vanishing amplitudes. The author has shown that, since friction is nearly negligible, the inner core can be set into motion by breaking the high axial symmetry of the interlayer dispersion forces exerted on it by the outer walls. For instance, by fabricating nanotubes with even just two segments having slightly different dielectric properties, it was concluded that the motion of a partially extruded core under the action of an external electric field could be remarkably stabilized and electrical energy could be both stored into and released from the van der Waals field. Further significant progress was made by identifying a possible mechanism for the time-modulation of the spectral properties of double-walled nanotubes by acting on the free-carrier exciton screening in semiconducting nanotubes. In this paper, new developments are presented in the accurate mathematical modeling of these complex driven systems and additional future applications of telescoping nanotubes as actuators, non-electrochemical energy nanostorage systems, and neutral particle accelerators are illustrated.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 819-825
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Correlation Between Elastic Properties and AFM Images of Nanocoatings on Polymers
    Autorzy:
    Gümüş, S.
    Polat, Ş.
    Lackner, J.
    Waldhauser, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193923.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    68.55.am
    68.55.J-
    68.37.Ps
    62.20.de
    68.60.Bs
    Opis:
    In a biomimetic approach for designing implants, both the physical properties (such as topography, elasticity, roughness, hydrophilicity, charges etc.) and the chemical structure of the artificial biomaterial should be considered, since they affect the adhesion of proteins in the nanometer-scale and of the cells in micro-scale at the interface. In this case, surface modification of biomaterials plays a major role because of the expectations from the material surface. These may be realized by changing the surface chemistry, physically or chemically, or by coating it with a material having a certain chemical composition. In this study, surface properties like topography and roughness, and mechanical properties like elastic modulus and hardness are determined for nanocoated materials.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1142-1144
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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