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    Wyświetlanie 1-12 z 12
    Tytuł:
    Tests of the Structure-Based Models of Proteins
    Autorzy:
    Cieplak, M.
    Sułkowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808305.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.Nj
    87.15.ap
    87.14.E-
    Opis:
    The structure-based models of proteins are defined through the condition that their ground state coincides with the native structure of the proteins. There are many variants of such models and they yield different properties. Optimal variants can be selected by making comparisons to experimental data on single-molecule stretching. Here, we discuss the 15 best performing variants and focus on fine tuning the selection process by adjusting the velocity of stretching to match the experimental conditions. The very best variant is found to correspond to the 10-12 potential in the native contacts with the energies modulated by the Miyazawa-Jernigan statistical potential and variable length parameters. The second best model incorporates the Lennard-Jones potential with uniform amplitudes. We then make a detailed comparison of the two models in which theoretical surveys of stretching properties of 7510 proteins were made previously.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 441-445
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Universal test stand for research of aeronautical multi - power path gear demonstrators
    Autorzy:
    Kozik, B.
    Budzik, G.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/246565.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    test stand
    multi-power path gear
    demonstrator
    Opis:
    Gears used for the tests may be made of metal or plastic [1, 2, 5]. The stand has been designed in an open system and it is powered by a three-phase electric motor. The control is provided by a single-phase inverter with three outputs, which provides full speed control. All components have been installed on a table equipped with T-slots in order to determine the optimal position of the drive and the tested gear. The load of the stand is realized by an electromagnetic powder brake. Load torque of the gear depends on the supplied current. During the test, you can change settings such as speed or load torque. Torque meters installed on input and output of the demonstrator let you control the work of the whole gear. Values supplied by the torque meters (torque and speed) are recorded on a computer in real time (according to PC RTC) and archived by specialized software. The software installed on your computer allows you to view results of the measurements. The possibility to control working time lets you precisely define the time intervals of various stages of the research. Using timer makes it possible to observe the current consumption of the transmission and helps to establish the research process. Thanks to data, recording you will know when the gear is damaged. Tests at this stand allow for obtaining stable working parameters, and thus for obtaining not distorted, accurate results of the demonstrator operation. Changing the gear is exceptionally simple because of the use of sliding splined connections of the couplings. Separating couplings between which the gear is situated and unlocking, the terminal allows exchanging it.
    Źródło:
    Journal of KONES; 2012, 19, 3; 233-238
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A universal stand for air gear test made in Rapid Prototyping process
    Uniwersalne stanowisko do badań przekładni lotniczych wykonanych w procesie Rapid Prototyping
    Autorzy:
    Budzik, G.
    Kozik, B.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/327802.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    diagnostics
    production
    universal stand
    rapid prototyping
    RP
    air gear
    diagnostyka
    wytwarzanie
    stanowisko uniwersalne
    Rapid Prototyping
    przekładnia lotnicza
    Opis:
    This paper presents a universal stand to diagnose air gear models made in the process of Rapid Prototyping (RP) at the production stage. The stand is designed in an open system, powered by a three-phase electric motor with a power of 0.75 kW, whose speed is controlled by a single-phase inverter. The stand is equipped with two measuring shafts, connected directly to a recorder RMC that allow you to read values torque and rpm in real time. Between this measuring shafts installed a gear reducer to allow the exchange of tested pair of gears. Powder brake with variable speed control is installed on the output as a load. Responsible for data acquisition software is copyright RMC-M - Monitor, which allows you to preview the results of measurements and print them in a report. Trials conducted on the universal test stand for air gears demonstrators give reproducible, stable work parameters and thus enable to obtain uninterrupted, accurate measurements.
    W niniejszym artykule przedstawiono uniwersalne stanowisko do diagnostyki na etapie wytwarzania modeli przekładni lotniczych wykonanych w procesie Rapid Prototyping (RP). Stanowisko zaprojektowane w układzie otwartym napędza trójfazowy silnik elektryczny o mocy 0,75kW, którego obroty regulowane są za pomocą jednofazowego falownika. Stanowisko wyposażono w dwa momentomierze, podłączone bezpośrednio do rejestratora RMC, które umożliwiają odczyt wartości momentu i obrotów w czasie rzeczywistym. Między momentomierzami zainstalowano przekładnię reduktora umożliwiającą wymianę badanej pary kół zębatych. Jako obciążenie zamontowano na wyjściu hamulec proszkowy z płynną regulacją obrotów. Za akwizycję danych odpowiedzialne jest autorskie oprogramowanie RMC-M –Monitor, które umożliwia podgląd wyników pomiarów i ich wydruk w formie raportu. Próby prowadzone na uniwersalnym stanowisku do badań demonstratorów przekładni lotniczych pozwalają na uzyskanie powtarzalnych, stabilnych parametrów pracy i tym samym na otrzymanie niezakłóconych, dokładnych wyników pomiarów.
    Źródło:
    Diagnostyka; 2015, 16, 2; 27-30
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doping Effects of Co, Ni, and Cu in $FeTe_{0.65}Se_{0.35}$ Single Crystals
    Autorzy:
    Bezusyy, V.
    Gawryluk, D.
    Berkowski, M.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431291.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    74.25.Op
    74.62.Dh
    74.70.Xa
    Opis:
    The resistivity, magnetoresistance, and magnetic susceptibility are measured in single crystals of $FeTe_{0.65}Se_{0.35}$ with Cu, Ni, and Co substitutions for Fe. The crystals are grown by Bridgman's method. The resistivity measurements show that superconductivity disappears with the rate which correlates with the nominal valence of the impurity. From magnetoresistance we evaluate doping effect on the basic superconducting parameters, such as upper critical field and coherence length. We find indications that doping leads to two component superconducting behavior, possibly because of local charge depression around impurities.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 816-819
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Flux Pinning in the Superconductor-Ferromagnet Bilayer Nb(Co/Pd)
    Autorzy:
    Syryanyy, Y.
    Zhu, L.
    Cieplak, M.
    Chien, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537204.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    74.78.Fk
    74.25.Ha
    75.70.Kw
    75.70.-i
    75.70.Cn
    75.78.Fg
    Opis:
    The magnetometry and the magnetic force microscopy are used to study the influence of the magnetic domain size on the flux pinning in a superconducting/ferromagnetic bilayer (SFB), in which the S layer is niobium and the F layer is a Co/Pd multilayer with perpendicular magnetic anisotropy. The domain size is pre-defined using the angle-dependent demagnetization. The enhancement of pinning is found to be the strongest, up to a factor of 6, for narrow domains and small magnetic fields. This result differs from the behavior observed in the SFB in which the F layer is Co/Pt. The difference may be attributed to the degree of the disorder in the domain pattern.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 399-401
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vortex Dynamics in Ferromagnetic/Superconducting Bilayers
    Autorzy:
    Cieplak, M.
    Adamus, Z.
    Kończykowski, M.
    Zhu, L.
    Chien, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812264.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Qt
    74.78.Db
    74.78.Fk
    Opis:
    The dependence of vortex dynamics on the geometry of magnetic domain pattern is studied in the superconducting/ferromagnetic bilayers, in which niobium is a superconductor, and Co/Pt multilayer with perpendicular magnetic anisotropy serves as a ferrromagnetic layer. Magnetic domain patterns with different density of domains per surface area and different domain size, w, are obtained for Co/Pt with different thickness of Pt. The dense patterns of domains with the size comparable to the magnetic penetration depth (w≥λ) produce large vortex pinning and smooth vortex penetration, while less dense patterns with larger domains (w ≫ λ) enhance pinning less effectively and result in flux jumps during flux motion.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 23-28
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Iron Substitutions on the Transport Properties of $FeTe_{0.65}Se_{0.35}$ Single Crystals
    Autorzy:
    Bezusyy, V.
    Gawryluk, D.
    Malinowski, A.
    Berkowski, M.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374765.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    74.62.Dh
    74.70.Xa
    Opis:
    We study the ab-plane resistivity and Hall effect in the single crystals of $Fe_{1-y}M_yTe_{0.65}Se_{0.35}$, where M = Co or Ni (0 ≤ y ≤ 0.21). In case of each dopant two types of crystals, with different crystalline quality, are prepared by Bridgman's method using different cooling rates, fast or slow. The impurities suppress the superconducting transition temperature, $T_c$, with different rates. $T_c$ reaches zero at markedly different impurity content: only 3 at.% of Ni, and about 14 at.% of Co. In addition, the suppression is somewhat dependent on the crystal cooling rate. The resistivity at the onset of superconductivity rises only weakly with the Co doping, while it increases 10 times faster for Ni. The Hall coefficient $R_{H}$ is positive for Co doping indicating that hole carriers dominate the transport. For Ni $R_{H}$ changes sign into negative at low temperatures for crystals with the Ni content exceeding 6 at.%. The implications of these results are discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-76-A-79
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Strain on the Superconducting Properties of Strongly Underdoped $La_{2-x}Sr_xCuO_4$ Thin Films
    Autorzy:
    Zaytseva, I.
    Cieplak, M.
    Paszkowicz, W.
    Abal'oshev, A.
    Berkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431516.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    74.62.En
    74.78.-w
    Opis:
    Using pulsed laser deposition we have grown films of $La_{2-x}Sr_xCuO_4$ with x in close vicinity of the superconductor-insulator transition, x=0.051 and x=0.048, on $SrLaAlO_4$ substrates, and of different thickness d (from 25 nm to 250 nm). The X-ray diffraction shows that for each d the films grow with variable degree of compressive in-plane strain, with the largest strain achieved in thinnest films. The resistivity measurements show strong enhancement of superconductivity with increasing strain, so that the onset of superconductivity at temperature as high as 27 K is observed. With increasing strain the character of resistivity changes from the insulating to metallic.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 858-865
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhomogeneous Magnetic Field Penetration in Superconducting Niobium Films
    Autorzy:
    Abal'osheva, I.
    Abal'oshev, A.
    Cieplak, M.
    Zhu, L.
    Chien, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537190.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Uv
    74.70.Ad
    Opis:
    The peculiarities of magnetic field penetration in the form of fingering or dendritic instabilities are studied by magneto-optical technique in the niobium films of different thickness. It is observed that the reduction of Nb film thickness reduces the threshold field for instabilities, in agreement with the theoretical predictions. In addition, it is shown that the silver overlayer deposited on the top of Nb film leads also to the enhancement of instabilities, in marked contrast to the effect of gold or aluminum overlayers, which are known to suppress instabilities.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 396-398
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance of Si/Nb/Si Trilayers
    Autorzy:
    Zaytseva, I.
    Cieplak, M.
    Abal'oshev, A.
    Dluzewski, P.
    Grabecki, G.
    Plesiewicz, W.
    Zhu, L.
    Chien, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537220.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.-c
    74.25.F-
    74.25.Ha
    74.62.En
    Opis:
    We study the superconductor-insulator transition in Si/Nb/Si trilayers, in which the thickness of Si is fixed at 10 nm, and the nominal thickness of Nb changes in the range between d = 20 nm down to d = 0.3 nm. The transmission electron microscopy indicates the formation of the mixed Nb-Si layer for small d. Both the thickness-induced, and the magnetic-field induced superconductor-insulator transition is observed. The crossing point of the isotherms at the critical field $B_{c}$ decreases with decreasing d, and it is T-independent at temperatures below 300 mK. At larger fields the weak peak in magnetoresistance appears in some of the films.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 406-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the Superconducting Properties of Laser Ablated $YBa_2Cu_3O_{7-δ}$ Films on $CeO_2$-Buffered Sapphire
    Autorzy:
    Abal'osheva, I.
    Zaytseva, I.
    Aleszkiewicz, M.
    Syryanyy, Y.
    Gierłowski, P.
    Abal'oshev, O.
    Bezusyy, V.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431267.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    77.55.Px
    81.15.Fg
    Opis:
    We use pulsed laser deposition to grow $YBa_2Cu_3O_{7-δ}$ (YBCO) superconducting films for microwave applications. The films are grown on R-cut sapphire substrates, with $CeO_2$ buffer layers, which are re-crystallized at high temperature prior to YBCO growth. Using the atomic force microscopy (AFM) and X-ray diffractometry we determine the optimal temperature for recrystallization (1000°C) and the optimal buffer layer thickness (30 nm). The properties of YBCO films of various thickness, grown on the optimized $CeO_2$ buffer layers, are studied using several methods, including AFM, magnetooptical imaging, and transport experiments. The YBCO film roughness is found to increase with the increasing film thickness, but the magnetic flux penetration in the superconducting state remains homogeneous. The superconducting parameters (the critical temperature and the critical current density) are somewhat lower than the similar parameters for YBCO films deposited on mono-crystalline substrates.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 805-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Characterization of $YBa_2Cu_3O_{7-δ}$ Films Deposited by Laser Ablation on $CeO_2$-Buffered Sapphire
    Autorzy:
    Abal'osheva, I.
    Zaytseva, I.
    Aleszkiewicz, M.
    Malinowski, A.
    Bezusyy, V.
    Syryanyy, Y.
    Gierłowski, P.
    Abal'oshev, O.
    Kończykowski, M.
    Cieplak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374756.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    77.55.Px
    81.15.Fg
    Opis:
    In this work we study the growth, by pulsed laser deposition, of $YBa_2Cu_3O_{7-δ}$ (YBCO) films on the $CeO_2$-buffered R-cut sapphire substrates, with the buffer layer recrystallized prior to the deposition of superconductor. We find that the superconducting critical temperature and the critical current density of the films are very close to similar parameters for the YBCO films grown on lattice-matched single crystalline substrates. It appears that the structural defects in the buffer layer affect the microstructure of YBCO films, resulting in high values of the critical current density, suitable for applications.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-69-A-72
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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