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    Wyświetlanie 1-9 z 9
    Tytuł:
    Electronic States of Collosal Magnetoresistive Manganites $La_{0.67}Pb_{0.33}Mn_{1-x}Fe_{x}O_{3}$ from Photoemission Spectroscopy
    Autorzy:
    Kowalik, M.
    Zalecki, R.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538821.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    79.60.Bm
    71.15.Ap
    74.20.Mn
    Opis:
    The electron photoemission spectra of valence bands and core-level states of manganese perovskite $La_{0.67}Pb_{0.33}(Mn_{1-x}Fe_{x})O_{3}$ with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 were measured by the X-ray and Ultraviolet Photoemission Spectroscopy (XPS and UPS) below and above the metal-insulator transition. From analysis of the Mn 2p core-level spectra the ratio $Mn^{3+}//Mn^{4+}$ was calculated as a function of the iron content. Comparison of the valence band spectrum with band structure calculations and with the high-resolution spectra measured at synchrotron radiation for Ca-, Ba- and Ce- substituted manganites revealed the strong hybridisation of Mn 3d and of O 2p states between -3 eV and -7 eV, and no estimated oxygen states between 0 eV and -2 eV where the Mn-3d states play a predominant role. The composition dependent insulating energy gaps were measured at room temperature. Reasons for the behaviour were discussed taking into account previous analysis of XPS/UPS spectra of other manganese perovskites.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 277-280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nuclear progesterone receptor isoforms and their functions in the female reproductive tract
    Autorzy:
    Rekawiecki, R.
    Kowalik, M.
    Kotwica, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/32231.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nuclear receptor
    female
    reproductive tract
    progesterone
    isoform
    function
    embryo
    corpus luteum
    reproductive system
    endocrine gland
    ovulation
    ovarian follicle
    hormone
    cattle
    animal physiology
    Opis:
    Progesterone (P4), which is produced by the corpus luteum (CL), creates proper conditions for the embryo implantation, its development, and ensures proper conditions for the duration of pregnancy. Besides the non-genomic activity of P4 on target cells, its main physiological effect is caused through genomic action by the progesterone nuclear receptor (PGR). This nuclear progesterone receptor occurs in two specific isoforms, PGRA and PGRB. PGRA isoform acts as an inhibitor of transcriptional action of PGRB. The inactive receptor is connected with chaperone proteins and attachment of P4 causes disconnection of chaperones and unveiling of DNA binding domain (DBD). After receptor dimerization in the cells’ nucleus and interaction with hormone response element (HRE), the receptor coactivators are connected and transcription is initiated. The ratio of these isoforms changes during the estrous cycle and reflects the different levels of P4 effect on the reproductive system. Both isoforms, PGRA and PGRB, also show a different response to the P4 receptor antagonist activity. Connection of the antagonist to PGRA can block PGRB, but acting through the PGRB isoform, P4 receptor antagonist may undergo conversion to a strongly receptor agonist. A third isoform, PGRC, has also been revealed. This isoform is the shortest and does not have transcriptional activity. Alternative splicing and insertion of additional exons may lead to the formation of different PGR isoforms. This paper summarizes the available data on the progesterone receptor isoforms and its regulatory action within the female reproductive system.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structure and Photoemission States of $La_{2//3}Pb_{1//3}MnO_3$
    Autorzy:
    Tokarz, W.
    Kowalik, M.
    Zalecki, R.
    Kołodziejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427488.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.Lx
    79.60.-i
    Opis:
    We present the theoretical study of electronic and magnetic properties in a manganese perovskite $La_{2//3}Pb_{1//3}MnO_3$. The calculations were carried out in frame of the first-principles density functional theory with the general gradient approximation using the WIEN 2K package. The P3c1 crystal structure was taken from the detailed X-ray diffraction data for the perovskite. The exact exchange energy was utilized for Mn d electrons. Density of states was determined by the modified tetrahedron method. As a result we get a valence band for the spin up and down density of states with the gap for the latter of 1.85 eV. We noticed that conduction band is mainly dominated by d spin up manganese electrons and $Mn (d_{xz}, d_{yz})$ states have twice larger contribution than $(d_{x^2 - y^2}, d_{xy})$. We attribute this to $Mn-O_6$ octahedral tilting. From the same reason $d_{3z^2 - r^2}$ state has no contribution to the density of states at the Fermi energy $(E_{F})$. Comparison of total density of states with the ultraviolet photoemission spectroscopy measurements shows similar features especially as far as the lead spectral intensity from the 6s electrons at about - 10 eV is concerned. The calculated total magnetic moment per formula unit is 3.66 $μ_{B}$, the measured one 3.48 $μ_{B}$/f.u.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1151-1153
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametryczny model numeryczny do predykcji właściwości mechanicznych struktur wytwarzanych w technologii FDM z materiałów polimerowych
    Parametric numerical model for predicting mechanical properties of structures made with FDM technology from polymeric materials
    Autorzy:
    Szczesiak, R.
    Kowalik, M.
    Cader, M.
    Pyrzanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/947040.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    ABS
    FDM technology
    rapid prototyping
    prediction of mechanical properties
    numerical modeling
    technologia FDM
    szybkie prototypowanie
    przewidywanie właściwości mechanicznych
    modelowanie numeryczne
    Opis:
    Przedstawiono badania nowego modelu numerycznego służącego do przewidywania właściwości mechanicznych struktur wytwarzanych w technologii fused deposition modeling (FDM). Model zaimplementowany w metodzie elementów skończonych odwzorowuje strukturę wewnętrzną badanego materiału na podstawie zadanych parametrów wytwarzania, takich jak: wysokość warstwy, odstęp między ścieżkami, orientacja kolejnych warstw. Oprócz analiz numerycznych przeprowadzono badania doświadczalne kształtek wytworzonych z ABS-M30 (Stratasys Ltd.), na ich podstawie wyznaczono moduły sprężystości podłużnej w trzech kierunkach i porównano je z wynikami uzyskanymi z modelu numerycznego. Różnice w wartościach modułów wyznaczonych na podstawie analiz numerycznych i badań doświadczalnych mieściły się w przedziale 0,79–6,19 %, w zależności od kierunku obciążenia. Tak niewielkie wartości błędów pozwalają na stwierdzenie, że przedstawiony model nadaje się do szacowania sztywności elementów wytwarzanych z wykorzystaniem technologii FDM.
    This article presents a new numerical model for predicting the mechanical properties of the structures produced using Fused Deposition Modeling (FDM) technology. The model implemented in the finite element method represents internal structure of the investigated material, generated based on manufacturing parameters such as layer height, raster spacing or orientation of subsequent layers. In addition to numerical analysis, the experimental investigation of the samples made of ABS-M30 (Stratasys Ltd.) were performed and longitudinal elasticity modules in three directions were determined and compared with the results obtained from the numerical model. Differences in experimental and numerical values of longitudinal modules ranged from 0.79 % to 6.19 % depending on the load direction. Such low error values allow to state that the presented model is suitable for estimating the stiffness of the components manufactured by Fused Deposition Modeling.
    Źródło:
    Polimery; 2018, 63, 9; 626-632
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies of riveted joints at feed force
    Autorzy:
    Bielawski, R.
    Kowalik, M.
    Rządkowski, W.
    Pyrzanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/102917.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    laminates
    damage mechanics
    mechanical testing
    joints
    joining
    Opis:
    The aim of the study was to determine the feasibility of riveted joints in composites materials. Static tensile test method was used. In the test one type of glass fabric was used (Interglas 92140) from which two types of composite samples were prepared. In each sample the same type of fiber with the same fiber orientation – 3 layers - was used. The samples had dimensions of 100×100 mm and thickness of approximately 1 mm. The composite probes were located in a metal frame with a screw connection which was made of screws with nominal thread pitch M5. Screws were tightened with constant torque. It was to provide an axial force to the sample during the tensile test. The frame was placed between cross-bars of tensile machine INSTRON 8516. The samples were stretched at a speed of 0.05 mm/s at a distance up to 15 mm. During the tensile test displacement of the samples and pull force were registered. Depending on the fibre orientations and the value of feed force, damage models were described. On the basis of the results the possibility of usage of aluminium rivet nuts connections in composite materials was determined.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 27; 23-27
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study on the Riveted Joints in Glass Fibre Reinforced Plastics (GFRP)
    Autorzy:
    Bielawski, R.
    Kowalik, M.
    Suprynowicz, K.
    Rządkowski, W.
    Pyrzanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/139928.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laminates
    mechanical properties
    damage mechanics
    mechanical testing
    riveted joint
    mechanical joining
    laminaty
    właściwości mechaniczne
    mechanika uszkodzeń
    badania mechaniczne
    złącze nitowane
    łączenie mechaniczne
    Opis:
    The aim of the paper is to validate the use of measurement methods in the study of GFRP joints. A number of tests were carried out by means of a tensile machine. The studies were concerned with rivet connection of composite materials. One performed two series of tests for two different forces and two fibre orientations. Using Finite Element Method (FEM) and Digital Image Correlation (DIC), strain maps in the test samples were defined. The results obtained with both methods were analysed and compared. The destructive force was analysed and, with the use of a strain gauge, the clamping force in a plane parallel to the annihilated sample was estimated. Destruction processes were evaluated and models of destruction were made for this type of materials taking into account their connections, such as riveting.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 301-313
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bismuth Valence in a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_{2}O_{y}$ Superconductor from X-Ray Photoemission Spectroscopy
    Autorzy:
    Zalecki, R.
    Woch, W.
    Kowalik, M.
    Kołodziejczyk, A.
    Gritzner, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537186.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Jb
    79.60.-i
    Opis:
    The X-ray electron photoemission spectra of a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_2O_{y}$ superconductor were measured with $Al K_{α}$ and $Mg K_{α}$ radiation at room temperature. The Bi 4f spectrum was compared to the same spectra of $Bi_{1.75}Pb_{0.35}Sr_{1.9}Ca_{2.05}Cu_{3.05}O_{y}$ and $Tl_{0.6}Pb_{0.4}Sr_{1.6}Ba_{0.4}Ca_2Cu_3O_{y}$ superconductors. In Bi,Pb-based superconductor only one type of $Bi^{3+}$ ions is present. The Bi 4f spectrum in the Tl,Bi-superconductor consists of two contributions due to the different valences. The component from $Bi^{5+}$ lines is in higher binding energy than from $Bi^{3+}$. The ratio of trivalent $Bi^{3+}$ to pentavalent $Bi^{5+}$ bismuth ions was calculated from decomposition of the spin-orbit split spectrum of the Bi 4f photoelectrons. The conclusion is that Bi is present in trivalent and in pentavalent form and the ratio of $Bi^{3+}$ to $Bi^{5+}$ is 1.87 ± 0.02.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 393-395
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Band Structure and Photoemission States of $Bi_{1.96}Mg_{0.04}Se_3$
    Autorzy:
    Tokarz, W.
    Zalecki, R.
    Kowalik, M.
    Kołodziejczyk, A.
    Kozłowski, A.
    Miotkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374118.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.55.Ak
    72.80.Ga
    75.47.Lx
    79.60.-i
    Opis:
    We present theoretical band structure calculations and ultraviolet electron photoemission spectroscopy of a topological insulator $Bi_{1.96}Mg_{0.04}Se_3$. Our calculations were based on the first-principles density functional theory with general gradient approximation using Wien2k package with the spin-orbit interaction included by a second-variation method. The R3̅m crystal structure was optimized. In consequence, 4% decrease of volume and 3% decrease of ratio c/a was obtained. This modified structure was multiplied three times in a and b direction in order to place proper amount of Mg. Final crystal structure P3m1 with 135 atoms was used for the calculations. As a result metallic band structure was obtained with conduction band extended from -5.6 eV up to 0.16 eV. It composes mostly from Se p states. Comparison of total DOS with ultraviolet photoemission spectrum shows similar features.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-127-A-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance study of c-axis oriented YBCO thin film
    Autorzy:
    Chrobak, M.
    Woch, W.
    Kowalik, M.
    Zalecki, R.
    Giebułtowski, M.
    Przewoźnik, J.
    Kapusta, Cz.
    Szwachta, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054863.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.78.-w
    74.25.Op
    74.25.Qt
    74.78.Bz
    Opis:
    The c-axis orientation YBa₂Cu₃O_δ thin film was prepared directly on MgO substrate by the pulse laser deposition. The thickness of the film is 170 nm. The superconducting critical temperature is T_{c50%}=87.5 K and the width of superconducting transition is ΔT = 1.8 K. The temperature dependences of magnetoresistance were measured up to 90 kOe. The widths of the transition to the superconducting state versus applied magnetic field were derived and they were fitted using the formula: Δ T=CH^m +Δ T₀. The irreversibility fields as a function of temperature were obtained and fitted by the de Almeida and Thouless-like equation: H_{irr}=H_{irr0}(1-T/T_{c0})^n. The irreversibility field at the liquid nitrogen temperature was calculated and it is H_{irr}=43.8 kOe when the applied magnetic field is parallel to the c-axis.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1018-1020
    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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