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    Wyświetlanie 1-22 z 22
    Tytuł:
    Propagation of powerful acoustic pulse with shock front in relaxing liquids
    Autorzy:
    Andreev, V.
    Khokhlova, V.
    Pischalnikov, Y.
    Sapozhnikov, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/332183.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Shock wave propagation in relaxing fluid is studied theoretically and experimentally. Modified spectral method is used in numerical simulations to provide an accurate description of weak shocks. For the medium with only one relaxation time, the waveforms of initially triangular pulse with shock front are calculated at various distances. It is shown that nonlinearity results in additional increasing of pulse duration and additional suppression of shock front damping. Experiments are performed in acetic acid as a monorelaxing medium. Short pulses are excited by optoacoustic source. A relaxation time of the fluid is changed by temperature variation. It is shown that pulse distortion is sensitive to the temperature of the medium. A relaxation time is evaluated from the analysis of shock pulse waveform after passing a layer of acetic acid. Theoretical and experimental results are in a good agreement.
    Źródło:
    Hydroacoustics; 1997, 1; 287-292
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Gate Dielectric in MOS Devices by Injection-Thermal and Plasma Treatments
    Autorzy:
    Andreev, V.
    Bondarenko, G.
    Maslovsky, V.
    Stolyarov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1381776.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Qv
    73.40.Gk
    Opis:
    The influence of injection-thermal and plasma treatments on the characteristics of the MOS-structure is studied. It is shown that the thermal stable part of the negative charge which accumulates in the phosphorus-silicate glass (PSG) film in the structures with the two-layer gate dielectric $SiO_2$-PSG under high-field Fowler-Nordheim electron injection can be used for the characteristics modification of MOS-structures with above described structure. The injection-thermal and plasma treatments of MOS-structures are offered to use for improving the reliability and finding the samples which have the charge defects. It is found that using the injection-thermal and plasma treatments allows to increase the injection and radiation stability of the dielectric films of MOS-structures due to structural changes in the $SiO_2$ film and $Si-SiO_2$ interface.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1371-1373
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of MOS Devices by High-Field Electron Injection and Arc Plasma Jet Treatment
    Autorzy:
    Andreev, V.
    Bondarenko, G.
    Maslovsky, V.
    Stolyarov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402221.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Qv
    73.40.Gk
    Opis:
    Methods of modification of gate dielectrics of the MOS structures by high-field electron injection and arc plasma jet treatment were studied. It is possible to use them for correction of parameters, decreasing defects number and increasing reliability of MOS devices. It was found that the negative charge accumulated in the film of the phosphorus-silicate glass of the MOS structures with the two-layer gate dielectric SiO₂-phosphorus-silicate glass under the high-field electron injection can be used for modification of devices with the same structures. It is shown that the injection-thermal treatment allows to find and exclude MOS structures with defects of isolation and charge defects. Arc plasma jet treatment was found to improve characteristics of the MOS devices. These treatments increase injection and radiation resistance of the gate dielectric by creating the needed density of electron traps in the bulk of SiO₂ film.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 887-890
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Breast cancer imaging by means of optoacoustic technique: initial experience
    Autorzy:
    Andreev, V. G.
    Oraevsky, A. A.
    Karabutov, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332227.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    A clinical prototype of the laser optoacoustic imaging system (LOIS) for breast cancer detection with 32-element transducer array is described. The frequency band of transducer array provided 0.5-mm axial in-depth resolution. Cylindrical shape of the 10-cm long array enabled us to receive the lateral resolution of 1.0 mm in the vicinity of focal zone. The system sensitivity provided detection of a 2-mm absorbing sphere at the depth of 60mm. An automatic recognition of the optoacoustic signal detected from the irradiated surface was implemented in order to visualize the breast surface and improve the accuracy of tumor localization. Radial back-projection algorithm was used for image reconstruction. Optimal filtering of image was employed to reduce low and high frequency noise. Time necessary for data acquisition and image reconstruction was reduced to 32 sec. The system performance was evaluated initially by imaging of the small absorbing objects in breast tissue-like phantoms. Clinical ex-vivo studies of mastectomy specimens were performed and compared with X-ray radiography and ultrasound.
    Źródło:
    Hydroacoustics; 2001, 4; 1-4
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of MIS Devices by Irradiation and High-Field Electron Injection Treatments
    Autorzy:
    Andreev, D.
    Bondarenko, G.
    Andreev, V.
    Maslovsky, V.
    Stolyarov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030209.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Ht
    72.20.Jv
    73.20.At
    73.40.Qv
    73.40.Ty
    77.22.Jp
    77.55.-g
    Opis:
    Methods to modify gate dielectrics of MIS structures by irradiation treatments and high-field electron injection into dielectric are considered. In addition, distinctive features of these methods used to correct parameters of MIS devices are studied. It was found out that negative charge, accumulating in the thin film of phosphosilicate glass (PSG) of the MIS structure having a two-layer gate dielectric SiO_2-PSG under the high-field injection or during the irradiation treatment can be used to correct the threshold voltage to improve the charge stability and raise the voltage of breakdown for the MIS devices. It is proved that the density of electron traps rises with the increasing thickness of the PSG film. In this paper a method to modify electrophysical characteristics of MIS structures by the high-field tunnel injection of electrons into the gate dielectric under the mode of controlled current stress is proposed. The method allows to monitor changing of MIS structure parameters directly during the modification process.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 245-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forming impulses for partial demagnetizing of rare-earth permanent magnets
    Formowanie impulsów dla częściowego odmagnesowania magnesów trwałych z ziem rzadkich
    Autorzy:
    Makarov, D.A.
    Nesterin, V.A.
    Yakovlev, L.S.
    Andreev, V.N.
    Spiridonov, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/159927.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    magnes trwały
    pierwiastki ziem rzadkich
    odmagnesowanie
    impuls
    rare-earth permanent magnets
    impuls magnetizing methods
    Opis:
    In manufacture of facilities with permanent magnets there are some tasks when application of gauged magnitudes of magnetic characteristics of permanent magnets is required. In order to solve such tasks it is necessary to develop the methods of partial demagnetizing. Within an impulse magnetic field it is carried out at the expense of feeding series of impulses of demagnetizing field. For monitoring a level of a magnet field the carrying force P of the permanent magnet may be used. The choice of the law of impulse forming depends on the set requirements in an exactitude and productivity of the partial demagnetizing process. Process of partly demagnetizing assumes one-side approximation to a certain value of magnetization along the magnetizing curve, beginning from the maximal value, without operations of partly magnetic bias of the permanent magnet when its magnetization decreased below the given level. Comparing the different laws of forming impulses is made using mathematical modeling of the partial demagnetizing process, based on real characteristics of permanent magnets.
    W wyrobie produktów z magnesami trwałymi zachodzi konieczność stosowania określonych charakterystyk magnetycznych. W tym celu konieczne jest opracowanie metod częściowego odmagnesowania przez powodowanie szeregu impulsów pola odmagnesowującego. Dla obserwowania poziomu pola magnetycznego można użyć siłę nośną P magnesu trwałego. Wybór prawa, formowanie impulsu zależy od zadanych wymagań odnośnie dokładności i skuteczności procesu odmagnesowania. Proces częściowego odmagnesowania zakłada przybliżenie pewnej wartości namagnesowania wzdłuż krzywej magnesowania zaczynając od wartości maksymalnej bez działania częściowego magnetycznego magnesowania wstępnego magnesu trwałego gdy namagnesowanie maleje poniżej danego poziomu. Porównanie różnych praw formowania impulsów wykonuje się stosując modelowanie matematyczne procesu odmagnesowania, w oparciu o rzeczywiste charakterystyki magnesów trwałych.
    Źródło:
    Prace Instytutu Elektrotechniki; 2006, 229; 149-159
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practice of Geobotanical Indication of Forest Growth Conditions in the Steppe and Wooded Steppe Ecotone in Central Mongolia
    Autorzy:
    Gunin, Petr D.
    Bazha, Sergey N.
    Miklyaeva, Inessa M.
    Karimova, Tatiana Y.
    Petukhov, Igor A.
    Andreev, Anatoly V.
    Bogdanov, Evgenij A.
    Tsyrempilov, Enkhe G.
    Powiązania:
    https://bibliotekanauki.pl/articles/124792.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Baikal catchment basin
    ecosystems
    belt groups of plants
    zonal groups of plants
    environmental conditions
    humidity factor
    Opis:
    The forest conditions in the Central Aimag of Mongolia, located in the southern part of the Baikal catchment area, near the southern border of the forest-steppe subzone, were examined within the framework of this study. The field materials collected in the summer 201–2018 at the Zuunmod Model polygon serve as the core of the study. An ecosystem map of the Model polygon with the scale 1:50 000 and the Key plot with the scale 1:5 000 was drawn up using World Viеw-2 satellite imagery data (2016). The proven method of botanical indication of forest growth conditions is as follows: identification of the ecologic and coenotic groups of plant species, calculation of the moisture coefficient based on the ratio of the number of species included in the groups characterizing the extreme conditions of the moisture gradient and distribution of communities in accordance with the values of the gradient in the ecological series. Communities of stages of ecological series serve as indirect indicators of the forest conditions: Stage I: Кu <1, insufficient humifying for tree growth, Stage II: Кu 1–2, average humifying, Stage III: Кu >2, sufficient humifying for tree growth. The stages also correspond to the landscape conditions and the character of the vegetation cover.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 2; 10-21
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Structure in UIrAl
    Autorzy:
    Prokeš, K.
    Prchal, J.
    Sechovský, V.
    Andreev, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813678.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    Opis:
    By means of neutron diffraction on a hexagonal UIrAl single crystal we find that this system orders ferromagnetically at low temperatures with magnetic moments of 0.93 (10) $μ_B$ aligned along the c axis. The Curie temperature $T_C$ = 65 (5) K determined from the diffraction experiment is in good agreement with bulk magnetic measurements.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 339-342
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Active Si:Er Layers Grown by the Sublimation MBE Method
    Autorzy:
    Stepikhova, M.
    Andreev, A.
    Andreev, B.
    Krasil'nik, Z.
    Shmagin, V.
    Kuznetsov, V.
    Rubtsova, R.
    Jantsch, W.
    Ellmer, H.
    Palmetshofer, L.
    Preier, H.
    Karpov, Yu.
    Piplits, K.
    Hutter, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992203.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Hi
    Opis:
    We report the first application of sublimation molecular beam epitaxy to grow uniformly and selectively doped Si:Er layers with Er concentration up to 5×10$\text{}^{18}$ cm$\text{}^{-3}$. The Hall concentration of electrons is about 10% of total Er contents. The mobility is 300-400 cm$\text{}^{2}$ V$\text{}^{-1}$ s$\text{}^{-1}$ at 300 K. All samples exhibit photoluminescence at 1.537 μm up to 100-140 K.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 549-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cast Intermetallic Alloys by SHS Under High Gravity
    Autorzy:
    Sanin, V.
    Andreev, D.
    Ikornikov, D.
    Yukhvid, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503724.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.05.Mh
    81.20.Ka
    Opis:
    Pilot-scale series of cast Ti-Al, Ti-Al-Nb, $(Ni, Co, Mn)Al_x$, Ni-Cr-Al-Si-C, and Co-V-Al-Si-C alloys were produced by thermit-type SHS under high gravity for their potential use as heat-resistant materials, master alloys, precursors for catalysts, etc.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 331-335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    V'rhč nâkoi aspekti na izgraždaneto na GIS v b'lgarskata armiâ; About some aspects bilding GIS in bulgerian army
    Autorzy:
    Andreev, Andrej I.
    Powiązania:
    Zeszyty Naukowe Wyższa Szkoła Oficerska im. gen. Józefa Bema, 2002, nr 21, s. 168-175
    Data publikacji:
    2002
    Tematy:
    Teren informacja automatyzacja system Bułgaria materiały konferencyjne
    Opis:
    Komputerowy system pozwalający na bardzo szybkie i dokładne pozyskanie i wykorzystanie wszystkich danych o terenie. VI Konferencja Katedry Nauk Technicznych "Oprzyrządowanie techniczne działalności bojowej artylerii".
    Rys.; Bibliogr.; Abstr., streszcz.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Andreev Reflection Study of the Superconductor $Mo_3Sb_7$
    Autorzy:
    Dmitriev, V.
    Rybaltchenko, L.
    Khristenko, E.
    Ishchenko, L.
    Bukowski, Z.
    Troć, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812340.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Ad
    Opis:
    The point-contact Andreev-reflection measurements on the new paramagnetic superconductor $Mo_3Sb_7$ were carried out. It was found that the order parameter ∆ is strongly anisotropic varying over a very wide range depending on the contact orientation when the maximum $∆_\text{max}$ exceeds at least 40 times the minimum $∆_\text{min}$ in spite of the invariable $T_c$ that cannot be typical of conventional superconductors. For these and other reasons we suggest that $Mo_3Sb_7$ is not a trivial BCS (s-wave) superconductor but rather has some unconventional pairing symmetry.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 263-267
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of upgraded hopper cars in the mining industry
    Ispolzovanie modernizirovannykh vagonov-khopperov v dobyvajushhejj promyshlennosti
    Autorzy:
    Gubacheva, L.
    Andreev, A.
    Leonova, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/792396.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    transportation
    rock
    dump
    hopper car
    mining industry
    railway rolling stock
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Absorption and Photoluminescence in Quantum Dots and Artificial Molecules
    Autorzy:
    Firsov, D.
    Vorobjev, L.
    Panevin, V.
    Fedosov, N.
    Shalygin, V.
    Samsonenko, J.
    Tonkikh, A.
    Cirlin, G.
    Andreev, A.
    Kryzhanovskaya, N.
    Tarasov, I.
    Pikhtin, N.
    Ustinov, V.
    Hanna, S.
    Seilmeier, A.
    Julien, F.
    Zakharov, N.
    Werner, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041673.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Fs
    Opis:
    Intraband absorption in n- and p-doped structures with InAs/GaAs quantum dots covered by InGaAs layers is studied both experimentally and theoretically. The absorption cross-section for p-type quantum dots was found to be significantly smaller than that for n-type quantum dots. Interband absorption bleaching under strong interband excitation is found and investigated in undoped quantum dot structures. Structures with artificial molecules were grown. Photoluminescence spectra and transmission electron microscopy images proves the presence of coupled symmetrical quantum dots.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 158-162
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Study of $GdMnO_{3}$ Multiferroic Thin Films
    Autorzy:
    Andreev, N.
    Abramov, N.
    Chichkov, V.
    Pestun, A.
    Sviridova, T.
    Mukovskii, Ya.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550592.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.50.Ee
    75.70.Ak
    77.90.+k
    Opis:
    Laboratory technology of $GdMnO_{3}$ thin film fabrication was elaborated. Samples of $GdMnO_{3}$ were fabricated at $NdGaO_{3}$ substrate by magnetron sputtering using off-axis scheme. Structure and phase content of the samples obtained were studied as well as their magnetic properties. The surface topography of the films was observed by atomic force microscopy. Presence of peculiarities at the temperature dependences of magnetic susceptibility points at magnetic phase transitions in $GdMnO_{3}$, which were found before in the single crystals. This fact jointly with X-ray data shows that at definite fabrication regimes one can obtain the multiferroics thin film $GdMnO_{3}$ modification, and the film quality permits to carry out accurate study of the compound in question.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 218-220
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys
    Autorzy:
    Hašková, V.
    Szabó, P.
    Kováč, J.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385695.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Ba
    74.45.+c
    77.80.bg
    Opis:
    The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and $Co₂Cr_{0.6}Fe_{0.4}Al$ ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for $Co₂Cr_{0.6}Fe_{0.4}Al$. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of $Co₂Cr_{0.6}Fe_{0.4}AlP₀$ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in $Co₂Cr_{1-x}FeₓAl$ Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 377-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perspective method to guarantee the reliability for the rolling stock of the railway
    Autorzy:
    Golybenko, A.
    Gubacheva, L.
    Andreev, A.
    Mokrousov, S.
    Shcherbakov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/374447.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    niezawodność
    tłumik cierny
    pojazd szynowy
    kolej
    reliability
    friction damper
    rolling stock
    railway
    Opis:
    The design method how to increase the reliability of the railroad underframe frictional dampers has been given. The new design for frictional wedge has been suggested, it helps to decrease both the wear of friction wedge and the deterioration of the connected with shpinton sleeve.
    Źródło:
    Transport Problems; 2012, 7, 4; 33-37
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Multilayer Nanostructured Coatings TiN/MoN Depending on Deposition Conditions
    Autorzy:
    Pogrebnjak, A.
    Abadias, G.
    Bondar, O.
    Postolnyi, B.
    Lisovenko, M.
    Kyrychenko, O.
    Andreev, A.
    Beresnev, V.
    Kolesnikov, D.
    Opielak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365941.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    62.25.-g
    Opis:
    This work presents the results of TiN/MoN coatings studying. These multilayer nanostructured coatings demonstrate dependence on depositions conditions on nanometer level. The influence of nanosized monolayer thickness on structure changing and properties of nanocomposite multilayer coatings TiN/MoN was found. Multilayer TiN/MoN coatings of the total thickness from 6.8 to 8.2 μm were obtained using C-PVD method. Thicknesses of monolayers were 2, 10, 20, 40 nm. The structure of samples was studied using X-ray diffraction (Bruker D-8 Advance) in Cu $K_{α}$ radiation, high resolution transmission electron microscopy with diffraction CFEI EO Techai F200, scanning electron microscopy with energy dispersive X-ray spectroscopy (JEOL-7001F), and microhardness measurements in dependence on indenter load. Scratch tests (friction, wear, etc.) were also provided using Rockwell-C diamond indenter (CSM Revetest Instruments) with a tip radius of 200 μm. Friction and wear behavior were evaluated using ball-on-plate sliding test on a UMT-3MT tribometer (CETR, USA). With decreasing monolayer thickness the hardness value increases, and the size of nanograins reduces. The values obtained for the friction coefficient of the multilayer system is much smaller than in nanostructured coatings of TiN (nc) or MoN (nc). Annealing showed formation of a (Ti,Mo)N solid solution and small growth of nanocrystals.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1280-1283
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New iterative method of solving nonlinear equations in fluid mechanics
    Autorzy:
    Palivets, M.
    Andreev, E.
    Bakshtanin, A.
    Benin, D.
    Snezhko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106452.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    trzęsienie ziemi
    mechanika płynów
    porowatość
    Adomian Decomposition Method ADM
    earthquake
    filtration
    fluid mechanics
    iterative method
    nonlinear fractional partial differential equations
    porous medium
    Opis:
    This paper presents the results of applying a new iterative method to linear and nonlinear fractional partial differential equations in fluid mechanics. A numerical analysis was performed to find an exact solution of the fractional wave equation and fractional Burgers’ equation, as well as an approximate solution of fractional KdV equation and fractional Boussinesq equation. Fractional derivatives of the order are described using Caputo's definition with 01<α≤ or 12<α≤. A comparative analysis of the results obtained using a new iterative method with those obtained by the Adomian decomposition method showed the first method to be more efficient and simple, providing accurate results in fewer computational operations. Given its flexibility and ability to solve nonlinear equations, the iterative method can be used to solve more complex linear and nonlinear fractional partial differential equations.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 163--176
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An integrated approach to development and simulation manufacturing processes of optical products
    Autorzy:
    Yablochnikov, E. I.
    Vasilkov, S. D.
    Andreev, Y. S.
    Pirogov, A. V.
    Tretyakov, S. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/406888.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical products
    polymer lens
    simulation
    CAD/CAM/CAE
    technological process
    injection molding
    additive technologies
    cyber-physical systems
    Opis:
    The engineering management process and automation method for making pilot set of optical polymer parts used in LED systems are considered. Optical system and lens geometry development are realized in Zemax. 3D model and molding tools with further generating of NC coded data are developed in Cimatron E. Pre simulation of injection molding process is realized in Moldex3D and thermo-mechanical analysis is provided by OOFELIE. 3D printer Objet is used for parts prototyping on different stages of the process. Data and process management are realized with a help of PDM system SmarTeam.
    Źródło:
    Management and Production Engineering Review; 2015, 6, 4; 94-103
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Population genetic structure of Iris pumila L. in Ukraine: effects of habitat fragmentation
    Autorzy:
    Bublyk, O.
    Andreev, I.
    Parnikoza, I.
    Kunakh, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2117815.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    conservation
    genetic polymorphism
    habitat fragmentation
    ISSR markers
    population
    genetics
    Opis:
    Habitat fragmentation is one of serious threats to biodiversity of nature in today's world. The present study of a typical steppe species Iris pumila L. (Iridaceae) has analyzed the impacts of geographical isolation and population size on genetic diversity and population structure in conditions of habitat fragmentation. The key indices of population genetic variability calculated from the ISSR markers data were on average as follows: Shannon diversity index (S) – 0.188; unbiased Nei’s gene diversity (He ) – 0.123; and the average measure of Jaccard’s genetic distances between individuals within populations – 58.4%. Although the largest population had significantly higher values of S and He, the small and marginal populations also showed a comparable level of variation. Most of the genetic variation of I. pumila was distributed within the populations. A strong correlation was found between Nei’s genetic distances and geographic distances between the populations. According to the Bayesian analysis, genetic structure of the populations was highly homogeneous; however, the presence of admixed genotypes indicated the possibility of gene flow between the populations at present.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2020, 62, 1; 51-61
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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