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    Wyświetlanie 1-12 z 12
    Tytuł:
    Mathematical model of the modified roll for spiral bevel gears milling machines
    Matematyczny model modyfikacji odtaczania frezarek do kół stożkowych o kołowo-łukowej linii zęba
    Autorzy:
    Skawiński, P.
    Kret, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176170.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spiral bevel gear
    CNC machine
    modified roll
    SGM
    koło zębate stożkowe
    obrabiarka sterowana numerycznie
    modyfikacja odtaczania
    Opis:
    This paper contains the description of conventional roll modification mechanism used for spiral bevel gears generation and presents several possible solutions for the implementation of this mechanism using mathematical equations. Accuracy of each method has been compared with respect to nominal values, and mathematical derivation has been discussed. Possible practical application in numerical machine control units and geometric simulation environments has been outlined.
    W pracy przedstawiono ideę mechanizmu modyfikacji odtaczania dla kół stożkowych o kołowo-łukowej linii zęba. Przedstawiono również kilka możliwości realizacji tego mechanizmu za pomocą równań matematycznych. Prowadzono analizę dokładności każdej metody z uwzględnieniem wartości nominalnych oraz omówiono sposoby ich matematycznego wyprowadzenia. Podano możliwości ich praktycznego zastosowania w sterownikach numerycznych urządzeń używanych do obróbki kół stożkowych, także w geometrycznych środowiskach symulacyjnych.
    Źródło:
    Advances in Manufacturing Science and Technology; 2013, 37, 2; 59-70
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of electrical resistivity tomography (ERT), induced polarization (IP) and electromagnetic conductivity (EMC) methods for the evaluation of technical condition of flood embankment corpus
    Autorzy:
    Cygal, A.
    Stefaniuk, M.
    Kret, A.
    Kurowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184207.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    conductivity methods
    resistivity tomography
    induced polarization methods
    river flood embankment
    Opis:
    A series of catastrophic floods that have occurred over the last twenty years in Poland brought an urgent need for taking preventive steps to monitor river embankment conditions. The main problem seems to be the development of efficient (i.e. fast and economical) measurements for controlling the condition of river embankments, because the execution of the full range of geotechnical measurements is both lengthy and costly. In this situation, a cheap and quick geophysical survey has been proposed to undertake this purpose. In this article the results of geophysical surveys are described which were performed using geoelectric and electromagnetic methods along a section of the Vistula embankment, located near the Maniów area in the Małopolska province. According to the archival data, this region is situated in a high-risk flooding zone. Three geophysical methods were used to recognize conditions of the levee: (i) Electrical Resistivity Tomography (ERT), (ii) Induced Polarization (IP) and (iii) Electromagnetic Conductivity (EMC). Geoelectrical measurement results were presented in the form of resistivity and polarization cross-sections. Results of conductivity measurement were presented in the form of plots. These parameters effectively supplement geotechnical testing, providing spatial information about the changes within the embankment and its substrate. It allows the prediction of potentially vulnerable areas to water percolation during flooding.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 3; 279-287
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie metody konduktometrycznej do typowania stref o zmiennych parametrach filtracyjnych w obrębie podstawy wału przeciwpowodziowego
    Application of the conductivity methods to select zones with variable filtration parameters around the base of river levee
    Autorzy:
    Cygal, A.
    Stefaniuk, M.
    Kret, A.
    Klityński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075405.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    metody konduktometryczne
    wał przeciwpowodziowy
    przebicie hydrauliczne
    geofizyka niesejsmiczna
    conductivity methods
    river levee
    subsurface erosion
    non-seismic geophysics
    Opis:
    The need to continuously monitor the flood embankment is necessary to introduce the measurement methods which give quick results in crisis situations. The protection of embankments as well as the prevention from floods are not only associated with the examination of the body river levee. Experience suggests that one of the problems involves the unknown geotechnical conditions of the levee base. Unfortunately, point geotechnical surveys carried out with a big measurement step were not able to fully identify the lithology variation over larger areas. This is caused by the high cost of drilling shallow wells. The application of non-invasive geophysical methods allows the completion of geotechnical research, and supplies additional information about the variability of geological medium. The structure in the area of the former river beds creates favorable conditions for carrying out geophysical surveys dependent on the variability of geoelectrical properties of rocks. This problem is solved by the use of conductivity method on the 100 m long part of the flood bank. This is recommended for quick and non-invasive measurements. A complex interpretation of geotechnical, hydrogeological and geophysical data provided information about the variability of geoelectrical parameters over this area and therefore made it possible to identify areas prone for greater filtration during high water levels.
    Źródło:
    Przegląd Geologiczny; 2015, 63, 10/1; 652--656
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Thin LT-GaN Cap Layers on the Structural and Compositional Quality of MOVPE Grown InGaN Quantum Wells Investigated by TEM
    Autorzy:
    Ivaldi, F.
    Kret, S.
    Szczepańska, A.
    Czernecki, R.
    Kryśko, M.
    Grzanka, S.
    Leszczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048084.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bg
    68.37.Lp
    68.65.Fg
    Opis:
    Two samples containing InGaN quantum wells have been grown by metal-organic vapor phase epitaxy on high pressure grown monocrystalline GaN (0001). Different growth temperatures have been used to grow the wells and the barriers. In one of the samples, a low temperature GaN layer (730°C) has been grown on every quantum well before rising the temperature to standard values (900°C). The samples have been investigated by transmission electron microscopy and X-ray diffraction. Photoluminescence spectra have been measured as well. The influence of the LT-GaN has been investigated in regard to its influence on the structural and compositional quality of the sample.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 660-662
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System
    Autorzy:
    Barańska, M.
    Dłużewski, P.
    Kret, S.
    Morawiec, K.
    Li, Tian
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033003.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.jp
    68.37.Lp
    07.05.Pj
    75.50.Pp
    Opis:
    The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1406-1408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FIB Method of Sectioning of III-V Core-Multi-Shell Nanowires for Analysis of Core/Sell Interfaces by High Resolution TEM
    Autorzy:
    Kret, S.
    Kaleta, A.
    Bilska, M.
    Kurowska, B.
    Siusys, A.
    Dąbrowski, J.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033031.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    nanowires
    HRTEM
    STEM
    EDS
    FIB
    GaAs
    GaAlAs
    Opis:
    The core-multishell wurtzite structure (In,Ga)As-(Ga,Al)As-(Ga,Mn)As semiconductor nanowires have been successfully grown on GaAs(111)B substrates using MBE technique. The nanowires cores were grown with gold eutectic catalyser in vapour-liquid-solid growth mode. The double shell overgrowth, on the side facets of nanowires, was performed using lower substrate temperature (about 400°C, and 230°C, for (Ga,Al)As, and (Ga,Mn)As shell growth, respectively). The polytypic ordering, defects, chemistry and geometric perfection of the core and the shells have been analysed at atomic level by advanced transmission electron microscope techniques with the use of axial and longitudinal section of individual nanowires prepared by focused ion beam. High quality cross-sections suitable for quantitative transmission electron microscope analysis have been obtained and enabled analysis of interfaces between the core and the shells with near atomic resolution. All investigated shells are epitaxial without misfit dislocations at the interface. Some of the shells thicknesses are not symmetric, which is due to the shadowing effects of neighbouring nanowires and directional character of the elemental fluxes in the MBE growth process.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1332-1335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutral and Charged Excitons Localized in the InAs/GaAs Wetting Layer
    Autorzy:
    Babiński, A.
    Czyż, M.
    Golnik, A.
    Borysiuk, J.
    Kret, S.
    Raymond, S.
    Lapointe, J.
    Wasilewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811914.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    78.55.Cr
    78.67.Hc
    Opis:
    It has recently been shown that potential fluctuations in a wetting layer, which accompanies InAs/GaAs quantum dots can localize excitons. Neutral excitons and biexcitons and charged excitons were identified. In this communication we report on studies of properties of the excitons over wide temperature range (T < 70 K). The micro-photoluminescence measurements enable investigation of excitons localized in a single potential fluctuation. Temperature-induced broadening of the neutral exciton as well as a quenching of the charged exciton at temperatures higher than 50 K are observed and discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1055-1060
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Properties of ZnO and ZnCdO Nanowires
    Autorzy:
    Zaleszczyk, W.
    Fronc, K.
    Aleszkiewicz, M.
    Paszkowicz, W.
    Wróbel, J.
    Dłużewski, P.
    Kret, S.
    Klepka, M.
    Kłopotowski, Ł.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047698.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    We report on the photoluminescence studies of ZnO and ZnCdO nanowires grown on SiO$\text{}_{2}$/Si substrates by low-pressure vapor phase synthesis. X-ray diffraction and transmission electron microscopy measurements show that the crystallographic structure of these ZnO and ZnCdO nanowires is of wurtzite-type with a high crystal perfection. Surface morphology of samples was determined by scanning electron microscopy and atomic force microscopy. The photoluminescence spectra of as-grown nanowires, nanowires extracted from the substrate and deposited onto Si wafer, and nanowires dispersed in ethanol by sonication were investigated at room temperature and compared to each other. The temperature dependence of the near band-gap photoluminescence emitted by the as-grown nanowires was also measured and analyzed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 357-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TEM Study of the Structural Properties of Nanowires Based on Cd, Zn, Te grown by MBE on Silicon Substrates
    Autorzy:
    Kaleta, A.
    Kret, S.
    Sanchez, A.
    Bilska, M.
    Kurowska, B.
    Szczepańska, A.
    Płachta, J.
    Wojnar, P.
    Wojciechowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032910.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.07.-b
    61.46.-w
    62.23.Hj
    81.07.Gf
    61.46.Km
    78.67.Uh
    07.10.Pz
    68.35.Gy
    68.37.Lp
    68.37.Og
    68.37.Ma
    Opis:
    In this work we report on the atomic structures, elemental distribution, defects and dislocations of three types of semiconductor nanowires: ZnTe, CdTe, and complex ZnTe/(Cd,Zn)Te core/shell hetero-nanowires grown by a molecular beam epitaxy on (111) Si substrate using a vapor-liquid-solid mechanism. The structural properties and the chemical gradients were measured by transmission electron microscopy methods. The nanowires reveal mainly sphalerite structure, however wurtzite nanowires were also observed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1399-1405
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital Magnetic Quantum Wells for the Study of Interface Sharpness of Molecular Beam Epitaxy Grown Structures
    Autorzy:
    Wojtowicz, T.
    Karczewski, G.
    Żakrzewski, A.
    Kutrowski, M.
    Janik, E.
    Dynowska, E.
    Kopalko, K.
    Kret, S.
    Kossut, J.
    Laval, J. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931933.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.55.Et
    Opis:
    We report on the growth and basic characterization of digital magnetic quantum wells, that is, quantum wells in which the well material is itself a short period superlattice composed of alternating diluted magnetic and nonmagnetic semiconductor layers each only a few monolayers thick. These novel structures can be useful in a variety of studies, including studies of barrier-well interface sharpness.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 165-168
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
    Autorzy:
    Gas, K.
    Janik, E.
    Zaleszczyk, W.
    Pasternak, I.
    Dynowska, E.
    Fronc, K.
    Kolkovsky, V.
    Kret, S.
    Morhange, J. F.
    Reszka, A.
    Wiater, M.
    Caliebe, W.
    Karczewski, G.
    Kowalski, B. J.
    Szuszkiewicz, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047950.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    68.65.La
    81.07.Vb
    Opis:
    We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Properties of ZnMnTe Nanowires
    Autorzy:
    Zaleszczyk, W.
    Janik, E.
    Presz, A.
    Szuszkiewicz, W.
    Morhange, J. F.
    Dłużewski, P.
    Kret, S.
    Kirmse, H.
    Neumann, W.
    Dynowska, E.
    Domagała, J. Z.
    Caliebe, W.
    Aleszkiewicz, M.
    Pacuski, W.
    Golnik, A.
    Kossacki, P.
    Baczewski, L. T.
    Petroutchik, A.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047697.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    68.65.La
    78.55.Et
    78.67.Bf
    81.15.Hi
    Opis:
    Catalytically enhanced growth of ZnMnTe diluted magnetic semiconductor nanowires by molecular beam epitaxy is reported. The growth is based on the vapor-liquid-solid mechanism and was performed on (001) and (011)-oriented GaAs substrates from elemental sources. X-ray diffractometry, scanning and transmission electron microscopy, atomic force microscopy, photoluminescence spectroscopy, and Raman scattering were performed to determine the structure of nanowires, their chemical composition, and morphology. These studies revealed that the obtained ZnMnTe nanowires possess zinc-blende structure, have an average diameter of about 30 nm, typical length between 1 and 2μm and that Mn$\text{}^{2+}$ ions were incorporated into substitutional sites of the ZnTe crystal lattice.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 351-356
    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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