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Wyszukujesz frazę "field of study" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Field Emission Study of Germanium Thin Films on a Niobium Surface
    Autorzy:
    Bakhtizin, R.Ζ.
    Suvorov, A.L
    Zaripov, R.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892517.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.50.Ge
    Opis:
    The behaviour of germanium on atomically clean niobium single crystal planes has been studied by probe-hole field emission microscopy as well as by means of the spectral analysis of field emission current fluctuations. Variations of average work function, surface diffusion activation energies, and slopes of the spectral density function with different coverages and substrate temperatures are measured.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 247-255
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Self-Diffusion of Iridium: Field Electron Emission Study
    Autorzy:
    Antczak, G.
    Błaszczyszyn, M.
    Błaszczyszyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014253.pdf
    Data publikacji:
    2000-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.-d
    68.35.Fx
    68.90.+g
    68.55.-a
    Opis:
    The self-diffusion of iridium was studied by means of field electron microscopy. The measurements, based on the well-known process of surface build-up, were carried out under the UHV conditions within the temperature range of 790-935K. The activation energy for the diffusion was determined to be equal to 2.10±0.10eV/atom (48.4±2.3kcal/mol). This value is compared with activation energies for self-diffusion on other metal surfaces, as well as with those for self-diffusion of single iridium atoms and clusters on iridium, known from the field ion microscopy measurements.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 4; 383-388
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mean-Field and Monte Carlo Study of a Mixed Ferro-Ferrimagnetic Ternary Alloy
    Autorzy:
    Dely, J.
    Bobák, A.
    Horváth, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813809.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.10.Ln
    75.10.Hk
    75.50.Gg
    Opis:
    We present a study of the magnetic properties of a mixed ferro-ferrimag-netic ternary alloy of the type $AB_p C_{1-p}$ on a cubic lattice consisting of three different Ising spins $S_A$ =3/2, $S_B$ = 2, and $S_C$ = 5/2. We employ the mean-field approximation and Monte Carlo simulation to find the compensation temperatures of the system for selected values of the parameters in the model Hamiltonian. In particular, the relation between considered mixed ferro-ferrimagnetic model and magnetic properties of the ternary metal Prussian blue analog such as $(Fe_p^{II}Mn_{1-p}^{II})_1.5$ $[Cr^{III}(CN)_6] \cdot nH_2O$ is discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 461-464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Pyroelectric Properties of the TGS-TGSe Crystals with Internal Electric Field
    Autorzy:
    Dziedzic, J.
    Mróz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044565.pdf
    Data publikacji:
    2005-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    Opis:
    Measurements of spontaneous polarization and pyroelectric coefficient versus temperature and electric field were performed for the TGS-TGSe crystals at a definite internal electric field. The obtained results are compared with the thermodynamic theory predictions. The temperature and electric field dependencies of pyroelectric coefficient are presented together with its maximal value as a function of the electric field intensity. It was shown that the temperature, at which the pyroelectric coefficient reaches its maximal value, depends on the external electric field.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 6; 971-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Time and Space Correlations in Field Emission Current Fluctuations with a Fiber-Optical Technique
    Autorzy:
    Dadykin, A. A.
    Naumovets, A. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892318.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    05.40.+j
    Opis:
    A new technique of measurements of field emission current fluctuations is proposed. The technique uses fiber optics and offers such advantages as the possibility to easily vary the geometry of the probed regions and the distance between them on the field emitter. The correlation functions of field emission current fluctuations have been measured with this technique for O/W(110), H/W(110), Si(111) and Na/Si(111) systems. Some data on surface diffusion coefficients are derived from the measurements.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 131-143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Epitaxial Layer Thickness on Built-in Electric Field in Region of AlGaAs/SI-GaAs Interface: A Photoreflectance Study
    Autorzy:
    Ochalski, T. J.
    Żuk, J.
    Vlasukova, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968408.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.20.-e
    Opis:
    We present a study of detailed line shapes of photoreflectance spectra for Al$\text{}_{0.3}$Ga$\text{}_{0.7}$ As/SI-GaAs epitaxial layers grown by MBE. All measurements were performed at 80 K under UHV conditions with a special care for the samples surface quality. A set of the photoreflectance spectra was collected for photon energies close to the GaAs and Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As band gaps (E$\text{}_{0}$). The photoreflectance spectra originated in the vicinity of the Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As/SI-GaAs interface were analyzed using the complex Airy function model of Franz-Keldysh oscillations. To examine the effect of the epitaxial layer thickness on parameters characterizing the interface, a step-by-step chemical etching was applied for stripping the top layers. The built-in electric field intensity, field inhomogeneity and phenomenological broadening parameter for interface regions were determined as a function of the epilayer thickness.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 935-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of degradation modes and their effects on reliability of photovoltaic modules after 12 years of field operation in the steppe region
    Autorzy:
    Saadsaoud, M.
    Ahmed, A.
    Er, Z.
    Rouabah, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054959.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.40.-J
    88.40.H-
    88.40.FF
    Opis:
    This paper presents an evaluation of the performance degradation of photovoltaic modules after twelve operation years in a steppe region environment in Algeria. The objective is to understand the different degradation modes of the photovoltaic modules and associated factors and their impact on the electrical properties (V_{oc}, I_{sc}, V_{max}, I_{max}, P_{max} and FF) using the degradation tests of IEC 61215 qualification standard and the electroluminescence test. The experimental results show that yearly degradation rates of the maximum power output P_{max} present the highest possible loss, ranging from 2.08% to 5.2%. Additionally, the results show that the short-circuit current I_{sc} comes second with yearly degradation rates spanning from 2.75% to 2.84%. Finally the open-circuit voltage V_{oc} is the least affected, with yearly degradation occurring from 0.01% to 4.25%.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 930-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusion of Potassium on the W(112) Plane Preadsorbed by Ni Atoms: Field Emission Current Fluctuations - Autocorrelation Study
    Autorzy:
    Biernat, T.
    Błaszczyszyn, R.
    Kleint, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027391.pdf
    Data publikacji:
    2001-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    68.37.Vj
    68.43.Jk
    05.40.Ca
    Opis:
    Diffusion of potassium adsorbate on the W(112) plane with preadsorbed nickel was investigated by means of the autocorrelation function of field emission current fluctuations. A comparison of the experimental autocorrelation function with that of a theoretical calculation by Gesley and Swanson gives the surface diffusion coefficient of potassium. From its temperature dependence the diffusion activation energy at several Ni pre-coverages for a constant potassium coverage (Θ$\text{}_{K}$=0.4) is derived. The dependence of the activation energy for potassium surface diffusion on the nickel coverage - first reduction and then an increase with increasing Ni coverage - is observed. This is in agreement with the results obtained from the spectral analysis of the field emission current fluctuations of the same system. The decrease is understood to be a result of the smoothing effect caused by Ni atoms on the W(112) plane.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 6; 665-672
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutron Diffraction Study of Ferromagnetic Ordering in La$\text{}_{1}\text{}_{/}\text{}_{3}$ Nd$\text{}_{1}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Induced by Electric Field
    Autorzy:
    Baszyński, J.
    Idzikowski, B.
    Toliński, T.
    Hoser, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013692.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    75.25.+z
    Opis:
    We used the neutron diffraction technique to study the ferromagnetic ordering process in La$\text{}_{1}\text{}_{/}\text{}_{3}$ Nd$\text{}_{1}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ induced by the short impulse of the external electric field E=4 V/cm at a magnetic field H=1.5 T. Our sample was prepared by the standard solid-state reaction. The diffraction measurements at 4 K, carried out for the neutron wavelength λ=0.2442 nm, have revealed the orthorhombic perovskite structure with the unit-cell parameters: a=0.5480 nm, b=0.5550 nm and c=0.7737 nm. We observed that a short impulse of the electric field develops the ferromagnetic ordering in a similar way as the magnetic field up to 4 T. We assume that the increased ferromagnetic ordering induced by the external electric field at a given magnetic field has the same physical origin as in the case of the Zener double exchange. The effect is confirmed by magnetic moment measurements using vibrating sample magnetometer.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 831-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ab Initio Study of the $\text{}^{57}Fe$ Electric Field Gradient in $(FeAl)_{1-x}T_x$ (T = 3d Element) Dilute Alloys with B2-Type Structure
    Autorzy:
    Michalecki, T.
    Hanc, A.
    Deniszczyk, J.
    Borgieł, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811576.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    71.20.Lp
    75.50.Bb
    76.80.+y
    Opis:
    We present an ab initio study of the electric field gradient at Fe nuclei in the series of $(FeAl)_{1-x}T_x$ dilute alloys with B2-type crystal structure. The ternary additions T, of concentration x ≈ 0.06, from the group of 3d-type transition metals (Ti, V, Cr, Mn, Co, Ni, Cu) are considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric field gradient are separated out and discussed in the context of the T-atom site preference and changes of the electronic structure upon alloying. Contrary to earlier reports, we found that for most Fe nuclei the dominant contribution comes from the d-type valence electrons cancelled partially by the 3p and 4p electric field gradients which are both of opposite sign to that of the 3d one. The shielding effect of 3p semicore electrons is found and related to the electric field gradient contributed by the local valence electrons.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1483-1491
    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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