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    Wyświetlanie 1-8 z 8
    Tytuł:
    Electroless Deposition of Composite Nickel-Phosphorous Coatings with Diamond Dispersoid
    Autorzy:
    Petrova, M.
    Georgieva, M.
    Chakarova, V.
    Dobreva, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/353820.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    functional composites
    electroless coatings
    metal-matrix composites
    non-metallic substrate
    Opis:
    The composite Ni-P coating with diamond particles (D) deposited on the flexible substrates of pressed polyethylene terephthalate material (PET) was obtained, to be used in the development of efficient, flexible grinding and polishing tools. The optimal conditions of the hydrodynamic regime, deposition time and temperature were found. The influence of the concentration and size of the D particles (3/7 ÷ 225/300 μm) on the coating thickness and number of co-deposited particles were studied. By Scanning Electron Microscopy (SEM) images were defined the morphology of dispersion coatings and number of co-deposited particles in them, and Energy Dispersive Spectroscopy (EDS/INCA) was used to determine the elemental chemical composition of the composite coatings.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 493-498
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Shifter Operation of the Azimuthally Magnetized Coaxial Ferrite Waveguide
    Autorzy:
    Georgieva-Grosse, M.
    Georgiev, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419702.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.60.Lj
    02.90.+p
    41.20.-q
    41.20.Jb
    85.70.Ge
    Opis:
    The terms for operation of the coaxial waveguide, entirely filled with azimuthally magnetized latching ferrite, as a digital nonreciprocal phase shifter for the normal $TE_{01}$ mode, are found. They are classified as physical, mathematical and functional ones. The physical prerequisites are drawn from the phase curves of the structure and specify the boundaries of the interval in which it produces differential phase shift for a given numerical equivalent of the modulus of off-diagonal ferrite permeability tensor element. The mathematical condition brings the parameters of configuration together with certain roots of its characteristic equation, derived in terms of complex Kummer and Tricomi confluent hypergeometric functions and with the related to them positive real $L_2(c,ρ,n)$ numbers (c=3, 0<ρ<1, n=1). The functional criteria determine the borders of the domain of phase shifter operation of the geometry. These are functions, defined for a fixed central conductor thickness which express in normalized form the impact of the guide radius on the phase shift at the cut-off frequencies and at the envelopes, denoting the termination of the phase curves for negative ferrite magnetization from the side of higher frequencies. The same are reckoned, employing iterative methods, consisting in a repeated numerical solution of the equation mentioned, followed by a computation of the guide radius and phase constant of the wave and are plotted graphically. The influence of the parameters of transmission line on the area referred to is analyzed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 63-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Kummer confluent hypergeometric function and some of its applications in the theory of azimuthally magnetized circular ferrite waveguides
    Autorzy:
    Georgiev, G. N.
    Georgieva-Grosse, M. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/309046.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    microwave propagation in anisotropic media
    microwave guides and components
    ferrite phase shifters
    switches
    isolators
    eigenvalue problems
    function-theoretic and computational methods in electromagnetic theory
    theoretical and numerical analysis of special functions
    Opis:
    Examples of the application of the confluent hypergeometric functions in miscellaneous areas of the theoretical physics are presented. It is suggested these functions to be utilized as a universal means for solution of a large number of problems, leading to: cylindrical, incomplete gamma, Coulomb wave, Airy, Kelvin, Bateman, Weber's parabolic cylinder, logarithmic-integral and exponential integral functions, generalized Laguerre, Poisson-Charlier and Hermit polynomials, integral sine and cosine, Fresnel and probability integrals, etc. (whose complete list is given), which are their special cases. The employment of such an approach would permit to develop general methods for integration of these tasks, to generalize results of different directions of physics and to find the common features of various phenomena, governed by equations, pertaining to the same family. Emphasis is placed here on the use of the Kummer function in the field of microwaves: the cases of normal and slow rotationally symmetric TE modes propagation in the azimuthally magnetized circular ferrite waveguide are considered. Lemmas on the properties of the argument, real and imaginary parts, and positive purely imaginary (real) zeros of the function mentioned in the complex (real) domain, of importance in the solution of boundary-value problem stated for normal (slow) waves, are substantiated analytically or numerically. A theorem for the identity of positive purely imaginary and real zeros of the complex respectively real Kummer function for certain parameters, is proved numerically. Tables and graphs support the results established. The terms for wave transmission are obtained as four bilaterally open intervals of variation of the quantities, specifying the fields. It turns out that the normal (slow) modes may exist in one (two) region(s). The theoretically predicted phase curves for the first waves of the two TE sets examined show that the structure explored is suitable for ferrite control components design.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 3; 112-128
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Layer Deposition of Magnetic Thin Films
    Autorzy:
    Mantovan, R.
    Georgieva, M.
    Perego, M.
    Lu, H.
    Cocco, S.
    Zenkevich, A.
    Scarel, G.
    Fanciulli, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814033.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    75.70.-i
    Opis:
    We report on the research effort towards the development of processes for the realization of magnetic tunnel junctions by atomic layer deposition. Our strategy follows two main schemes. The first is a hybrid process where the ferromagnetic layers are produced by chemical vapour deposition and the tunnel oxide is deposited by atomic layer deposition. As ferromagnetic electrodes we use Co and $Fe_3O_4$, while MgO, $Al_2O_3$, and $HfO_2$ are employed as tunnel oxides. The second and most intriguing scheme is a full-oxide approach in which the ferromagnetic layers and the tunnel barrier layer are all oxides grown by atomic layer deposition. As ferromagnetic layers we focused on the growth of complex manganites $(La_{0.7}Sr_{0.3}MnO_3)$ while as a tunnel oxide we propose $La_2O_3$. Film composition has been studied with time of flight secondary ion mass spectroscopy and Rutherford backscattering spectrometry. X-ray diffraction, X-ray reflectivity, and Fourier transform infrared spectroscopy have been used to investigate the structure and morphology of the layers. The magnetic properties of the films are measured by superconducting quantum interference device magnetometer.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1271-1280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance of Istanbul Grand Airport (Iga) for Turkey and Its Influence on Widely Regional Air Traffic Around
    Autorzy:
    Georgieva, A. D.
    Düzgün, M.
    Tanyaş, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/409296.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    Air transportation capacity of Turkey
    Istanbul Grand Airport (IGA)
    regional air traffic
    Opis:
    Air transportation can be defined as the movement of cargo and passengers by aircrafts, such as airplanes. It has grown to become a huge international industry, which plays a crucial role in the modern globalized world and is one of the main means of common-carrier traveling. In the last decade there has been a significant increase in the regional air traffic in Turkey. The rapid increase of aircraft and passenger movements have shown that although the Atatürk Airport is operating using almost full runway capacity, its current facilities and capacities are not sufficient. And although Sabiha Gokcen, the second Istanbul Airport, does not face immediate problems, there may be a need for new facilities and additional runways in the future. In order to deal with the existing capacity insufficiencies and other problems, the Turkish government started the construction of Istanbul's third airport. Scheduled for six-runway (additional 6 more) development, Istanbul Grand Airport is surrounded by many hopes and the high expectation of becoming the biggest and busiest airport terminal of the world and six continents. But is there really a need of a new airport in Istanbul? and what will its regional and international role be? The aim of this paper is to answer those questions, as well as to explore the opportunities and benefits related with the construction of the Grand Airport and the influences it will have on the regional air traffic around.
    Źródło:
    Research in Logistics & Production; 2015, 5, 3; 239-254
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomass of the xerothermic oak ecosystem on a site of community importance, BG0001040 "Zapadna Stara Planina i Predbalkan", Bulgaria
    Autorzy:
    Lyubenova, M.
    Dimitrova, V.
    Georgieva, N.
    Dimitrov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/52482.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    biomass
    xerothermic plant
    forest ecosystem
    oak
    plant community
    Quercus frainetto-Quercus cerris forest
    Zapadna Stara Planina i Predbalkan area
    Natura 2000 area
    Bulgaria
    Opis:
    The belowground and aboveground biomass was estimated for the tree story, sproutsand seedling regeneration in a representative Quercus frainetto – Quercus cerris ecosystem on “Zapadna Stara planina i Predbalkan”, a Site of Community Importance (SCI). The biomass was measured by destructive sampling (on sample or “model trees” representing three calculated density classes for each species and cut at the stump) of leaves, annual and perennial branches, wood, bark and root components. The belowground (root) biomass was also calculated from a subsample. The data obtained were compared to the results of previous studies and the values on the Bazilevich and Rodin [1971] scale. The ecological status of the forest ecosystem studied and its functional efficiency are discussed based on the study results and specific climate data.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariate statistical interpretation of clinical data of prolactinoma patients
    Interpretacja statystyczna wielowymiarowych danych klinicznych pacjentów z prolaktynemią
    Autorzy:
    Georgieva-Nikolova, R.
    Kamenov, Z.
    Slavova, M.
    Nikolov, M.
    Simeonov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/388163.pdf
    Data publikacji:
    2013
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    prolactinoma
    clinical data
    data treatment
    cluster analysis
    principal components analysis
    prolaktynemia
    dane kliniczne
    obróbka danych
    analiza skupień
    analiza głównych składowych
    Opis:
    This study reveals some specific relationships between the clinical parameters usually checked at prolactinoma patients allowing in such a way to optimize the monitoring procedure by selecting a reduced number of health status indicators. This is achieved by multivariate statistical interpretation of the parameter values where clusters of indicators with correlated (similar) response are proven. Additionally, four patterns of prolactinoma patients are found each one of them characterized by specific clinical indicators. This original information could be of use for better interpretation of the health status of the patients.
    Przeprowadzone badania pacjentów z prolaktynemią wykazały istnienie pewnych zależnooeci pomiędzy parametrami klinicznymi, umożliwiających optymalizację procedur monitorowania stanu zdrowia za pomocą mniejszej liczby wskaźników. Taką optymalizację można osiągnąć dzięki interpretacji wartooeci parametrów za pomocą wielowymiarowych metod statystycznych, za pomocą których wykazano istnienie skorelowanych grup zmiennych wskaźnikowych. Dodatkowo stwierdzono istnienie czterech grup pacjentów z prolaktynemią, charakteryzujących się specyficznymi wskaźnikami klinicznymi. Informacje te mogą być wykorzystane do lepszej oceny stanu zdrowia pacjentów.
    Źródło:
    Ecological Chemistry and Engineering. A; 2013, 20, 4-5; 585-594
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Micropropagation studies and antioxidant analysis of the endangered plants of Bulgarian yellow gentian (Gentiana lutea L.)
    Autorzy:
    Petrova, M.I.
    Zayova, E.G.
    Dimitrova, L.I.
    Geneva, M.P.
    Miladinova-Georgieva, K.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/12687267.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    yellow gentian
    Gentiana lutea
    herbal plant
    medicinal plant
    endangered plant
    micropropagation
    seed germination
    plant growth regulator
    antioxidant
    antioxidant analysis
    Opis:
    In order to develop an efficient micropropagation system, it is essential to establish the appropriate concentration of growth regulators for seed germination, shoot formation and rooting. Nodal segments from in vitro obtained seedlings of Gentiana lutea L. were cultured in vitro in Murashige and Skoog’s medium supplemented with BAP, Thidiazuron and Zeatin (0.5, 1.0 and 2.0 mg L−1). A maximum number of shoots with the highest height was recorded at 2.0 mg L−1 BAP. For further optimization of the process, we used nutrient media containing BAP and Zeatin with a combination of low concentration of Indoleacetic acid. MS medium containing 2.0 mg L−1 Zeatin and 0.2 mg L−1 IAA resulted in maximum numbers of shoots 94.3) with shoot height 2.5 cm. The multiple plants were successfully ex vitro acclimatized with 65% survival. The presence of growth regulators (2.0 mg L−1 Zeatin and 0.2 mg L−1 IAA) in the nutrient media resulted in an effective antioxidant activity in G. Lutea determined by the low molecular antioxidant metabolites such as phenols and flavonoids and activities of antioxidant enzymes – catalase, ascorbate peroxidase, guaiacol peroxidase, and superoxide dismutase. The described protocol allows the establishment of numerous micropropaged plants of rare and endangered G. lutea.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 3; 71-78
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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