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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Origin of EPR Signals in SrCuO$\text{}_{2}$ Ceramics
    Autorzy:
    Augustyniak-Jabłokow, M. A.
    Yablokov, Yu. V.
    Ivanova, T. A.
    Jacyna-Onyszkiewicz, I.
    Shustov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043623.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    76.30.Fc
    81.05.Je
    Opis:
    The origin and thermal evolution of the EPR signals in SrCuO$\text{}_{2}$ ceramics are studied. It has been shown that the EPR signals observed in this ceramic material are due to contamination with other phases. The axial signal is due to SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O, which is a product of water reactions with SrCuO$\text{}_{2}$.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 345-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Study of Water Induced Decomposition of the SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ Ceramics Surface. The Role of Carbon Dioxide
    Autorzy:
    Augustyniak-Jabłokow, M. A.
    Yablokov, Yu. V.
    Jacyna-Onyszkiewicz, I.
    Ivanova, T. A.
    Shustov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047737.pdf
    Data publikacji:
    2007-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    76.30.Fc
    81.05.Je
    Opis:
    Processes of SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ ceramics decomposition induced by contact with water and carbon dioxide were studied by EPR. The dominant signals in the spectra were found to originate from Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ (for Sr$\text{}_{2}$CuO$\text{}_{3}$) and SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O (for SrCuO$\text{}_{2}$) compounds. The thermally induced conversion of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O into Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ was analysed, and its product CuO was found to exist in the nanocrystalline form. The presence of CO$\text{}_{2}$, reacting with Sr(OH)$\text{}_{2}$, was shown to modify the decomposition process leading to the appearance of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O, some hydroxycarbonates and Cu(OH)$\text{}_{2}$ on the surface of ceramics studied. At temperatures higher than 300ºC CuO reacts back with Sr(OH)$\text{}_{2}$. For the samples being in contact with atmospheric moisture this compound, deposited on a surface of SrCuO$\text{}_{2}$, decomposes to Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$. The presence of the antiferromagnetic compounds Cu(OH)$\text{}_{2}$, CuO, and Cu$\text{}_{2}$[(OH)$\text{}_{2}$CO$\text{}_{3}$] in the samples can influence the results of magnetic measurements of the studied ceramics.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 3; 525-536
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of GdMn$\text{}_{x}$Fe$\text{}_{1-x}$Si intermetallic Compounds
    Autorzy:
    Nikitin, S. A.
    Ivanova, T. I.
    Tskhadadze, I. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956493.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    Opis:
    Magnetic properties of GdMn$\text{}_{x}$Fe$\text{}_{1-x}$Si (x = 1, 0.9, 0.8, 0.7, 0.6, 0) compounds were investigated. Both GdMnSi and GdFeSi crystallize in the CeFeSi-type tetragonal structure and form a complete solid solution without any change in the crystal structure. Magnetic measurements were made in static magnetic fields up to 1 MA/m in the temperature range from 77 K to 420 K. For GdFeSi these measurements were carried out on single crystal sample. It was found that the increase in Fe content leads to a sharp decrease in saturation magnetic moment. The Curie temperature increases in the concentration range 0.7 ≤ x ≤ 1 and monotonously decreases for x ≤ 0.6. These effects could be explained by strong dependence of the exchange integrals on the interatomic distances.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 463-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of chemical composition of tough-to-machine steels on grinding technologies
    Autorzy:
    Ivanova, T. N.
    Korshunov, A. I.
    Božek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/409674.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    tough-to-machine materials
    chemical composition
    structure
    grinding
    grinding wheels
    Opis:
    The main purpose of processing of tough-to-machine materials is improving of cutting process of steels with different physicochemical properties and alloying by means of various chemical elements in combination with heat treatment. Producing of high quality surface layers depends on properties of material used to make details, that is why reasons of tough machining were identified: influence of chemical composition and resulting structure. The studies of grinding of tough-to-machine materials were undertaken by means of grinding wheels made from synthetic diamonds as they are most resistant and highly-productive. Based on the studies recommendations for using of characteristics of grinding wheels and tough-to machine steel grades are given. Research on heat processes during grinding allows us to determine patterns showing how cutting speed, detail motion speed, area and action period of contact influence temperature and speed of heat processes in surface layers as well as depth of heating. These patterns also give the chance to show interrelation between temperature and rate of heating and cooling. This gives an opportunity to predict state of structure of surface layer of details made of tough-to-machine steels under different machining conditions reasonably.
    Źródło:
    Management Systems in Production Engineering; 2018, 3 (26); 172-177
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual completion petroleum production engineering for several oil formations
    Autorzy:
    Ivanova, T. N.
    Korshunov, A. I.
    Koretckiy, V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/409668.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    dual completion
    wells
    deposits
    layouts
    hydrocarbons
    Opis:
    Cost-efficient, enabling technologies for keeping and increasing the reservoir recovery rate of oil-formations with high water cut of produced fluids and exhausted resource are really essential. One of the easiest but short-term ways to increase oil production and incomes at development of oil deposits is cost of development and capital cost reduction. Therefore, optimal choice and proper feasibility study on the facilities for multilayer oil fields development, especially at the late stage of reservoir working, is a crucial issue for now-day oil industry. Currently, the main oil pools do not reach the design point of coefficient of oil recovery. The basic feature of the late stage of reservoir working is the progressing man-made impact on productive reservoir because of water injection increasing for maintaining reservoir pressure. Hence cost-efficient, enabling technologies for keeping and increasing the reservoir recovery rate of oil-formations with high water cut of produced fluids and exhausted resource are really essential. To address the above concerns the dual completion petroleum production engineering was proposed. The intensity of dual completion of formation with of different permeability is determined by rational choice of each of them. The neglect of this principle results a disproportionately rate of highly permeable formations development for the time. In effect the permeability of the formations or their flow rate is decreasing. The problem is aggravated by lack of awareness of mechanics of layers' mutual interference in producers and injectors. Dual completion experience in Russian has shown, that success and efficiency of the technology in many respects depend on engineering support. One of the sufficient criteria for the choice of operational objects should be maximal involvement of oil-saturated layers by oil displacement from seams over the economic life of well producing oil. If it is about getting high rate of oil recovery for irregular formations there is no alternative to dual completion and production. The recommended dual completion petroleum production technology enables development several formations by single well at the time. The dual completion petroleum production technology has been more important than ever because it is right not only for formations but for thin layers with undeveloped remaining reserves.
    Źródło:
    Management Systems in Production Engineering; 2018, 4 (26); 217-221
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smart rail infrastructure, maintenance and life cycle costs
    Inteligentna infrastruktura kolejowa, utrzymanie i koszty cyklu życia
    Autorzy:
    Niculescu, M.
    Golgojan, A.
    Bednarz, A.
    Ivanova, G.
    Maly, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/374617.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railways
    smart infrastructure
    ERTMS
    power grid management
    track circuit
    regenerative braking
    koleje
    inteligentna infrastruktura
    zarządzanie siecią energetyczną
    obwód toru
    hamowanie regeneracyjne
    Opis:
    This paper discusses smart railway infrastructure systems. The meaning of “smart” is described followed by a discussion on the benefits of the use of smart infrastructure. Some key components of smart infrastructure, few examples and case studies are presented. Our analysis suggests that the implementation of a smart system may well lead to energy savings of 25%, therefore smart systems should be implemented in larger scale.
    W artykule poruszono zagadnienia inteligentnych systemów infrastruktury kolejowej. Znaczenie słowa „inteligentne” jest wielokrotnie poruszane w kontekście korzyści płynących z użycia inteligentnej infrastruktury. Zaprezentowano kilka kluczowych elementów, składających się na inteligentne systemy, przykłady technologii oraz ich wprowadzenie w życie codzienne. Nasza analiza wykazała, że wprowadzenie inteligentnych systemów infrastruktury może prowadzić do oszczędności energii rzędu 25%, w związku z czym powinny one być wdrożone na większą skalę.
    Źródło:
    Transport Problems; 2014, T. 9, z. spec.; 109-122
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioceramic micro and nanoparticles as functional biological materials
    Autorzy:
    Parakhonskiy, B.
    Saveleva, M.
    Svenskaya, Y.
    Ivanova, A.
    Lengert, E.
    Alebastrova, A.
    Yashchenok, A.
    Gorin, D.
    Bukreeva, T.
    Marchenko, I.
    Douglas, T.
    Skirtach, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/284720.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    calcium carbonate
    biomaterials
    properties
    Źródło:
    Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 77
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromatography analysis of seminal plasma proteins in buffalo semen samples with high and low cryotolerance
    Autorzy:
    Ivanova, M.G.
    Gradinarska, D.G.
    Tsvetkov, T.S.
    Kirilova, I.V.
    Georgiev, B.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087567.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    buffalo
    seminal plasma proteins
    cryotolerance
    HPLC
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 1; 11-16
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance in n-Si/$SiO_2$/Ni Nanostructures Manufactured by Swift Heavy Ion-Induced Modification Technology
    Autorzy:
    Fedotova, J.
    Ivanou, D.
    Ivanova, Y.
    Fedotov, A.
    Mazanik, A.
    Svito, I.
    Streltsov, E.
    Saad, A.
    Tyutyunnikov, S.
    Kołtunowicz, T.
    Demyanov, S.
    Fedotova, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504014.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    81.05.Rm
    73.22.-f
    73.50.Jt
    Opis:
    A study of magnetotransport in the n-Si/$SiO_2$/Ni nanostructures with granular Ni nanorods in $SiO_2$ pores was performed over the temperature range 2-300 K and at the magnetic fields induction up to 8 T. The n-Si/$SiO_2$/Ni Schottky nanostructures display the enhanced magnetoresistive effect at 25 K due to the impurity avalanche mechanism.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 133-135
    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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