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    Wyświetlanie 1-10 z 10
    Tytuł:
    Analysis of Ecological Condition of Taiga Topsoil During Commercial Development
    Autorzy:
    Sivkov, Y.
    Nikiforov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/123562.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    soil
    pollutants
    oil
    industrial development
    ecology
    Opis:
    The paper analyses the ecological properties of taiga topsoil during its commercial development and assesses the consequences of impact which will be made by the future facilities on the environment (taking into account the types of impact, their characteristics, the tendencies of transformation in the nature systems growing with the increase of service life, which were detected at the producing fields), sanitary and socioeconomic aspects of the facilities operation under the conditions of specific geographical complexes. The object of study included waspodzolic and swamp-podzolic soils located in the Uvat district in Khanty-Mansiysk Autonomous Region of Tyumen region, in the area of potential impact of industrial facilities. The method of study implied the selection of soil specimens and their examination according to the standard practices. Ten specimens were taken from each of three areas of sampling. The specimens were subjected to office study in order to determine eleven parameters. The sources of impact made by the oil and gas facility on the environment were the material objects (buildings, constructions etc.), elements and assemblies of basic and auxiliary technologies which result in pollutants emission. The major impact on topsoil at the stage of preparatory works and construction of facilities was the mechanical damage to the natural state of soils. It is primarily connected with sites stripping from forestry and ground leveling. The paper reviews the issues of ecological condition of topsoil and forecast of possible changes while commercial development of the studied area. A negative load on soil may be decreased through planning and implementation of organizational measures on assessment of current state of the topsoil within the field and environmental threat from basic and auxiliary industrial facilities.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 1; 163-169
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raschet koehfficientov aehrodinamicheskikh sil i momentov, dejjstvujushhikh na semena rastitel'nykh kul'tur v potoke vozdukha metodom ploskikh sechenijj
    Calculation of coefficients of aerodynamic forces and moments, operating on seed of vegetable cultures in blast, by method of flat sections
    Autorzy:
    Luk'janenko, V.
    Nikiforov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/77205.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    aerodynamic force
    calculation
    seed
    vegetable cultivation
    blast
    algorithm
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetotransport Characterization of HgCdTe Solid Solutions Structural Quality
    Autorzy:
    Berchenko, N. N.
    Kurbanov, K. R.
    Nikiforov, A. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933722.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    Opis:
    It has been demonstrated that variable-magnetic-field Hall measurements for n-Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te samples in the extrinsic and intrinsic conductivity regions permit to identify and to evaluate semiqualitatively electrical activity of extended defects in this material.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 679-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Absorption Studies of Ge Layers Buried in Silicon Crystal
    Autorzy:
    Demchenko, I. N.
    Ławniczak-Jabłońska, K.
    Zhuravlev, K. S.
    Piskorska, E.
    Nikiforov, A. I.
    Welter, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030656.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    78.70.Dm
    81.05.Gc
    Opis:
    Polarization-dependent X-ray absorption spectroscopy was used to study the local microstructure of Ge layers buried in silicon. The layers with thickness from 6 to 20 monolayers of Ge were grown by molecular beam epitaxy on Si substrate and were covered by Si (20 nm). To investigate the morphology of grown structures, X-ray absorption near edge structure and extended X-ray absorption fine structure analysis of the Ge K-edge was done. The performed qualitative analysis proves that X-ray absorption spectra are very sensitive to the local order in the formed structures and are sources of unique information about morphology of the buried Ge layers. Using these techniques we were able to observe the changes in atomic order around the Ge atoms in investigated buried layers and compare the formed atomic order with that in crystalline Ge. A substantial increase in intensity, broadening and chemical shift of the X-ray absorption near edge structure spectrum for 8 ML were observed. It can be related to the increase in density of electron states caused by increase in the localization of the states due to potential appearing at the Ge island boundaries and indicated the formation of quantum dots. The observed in-plane modulations of radial distribution and out-of-plane for different layers were discussed.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 709-717
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Substrate-Induced Strain in Epitaxial Lead Chalcogenides by Galvanomagnetic Effect Rotational Dependence
    Autorzy:
    Berchenko, N. N.
    Dobriansky, O. A.
    Korovin, A. V.
    Nikiforov, A. Yu.
    Yakovyna, V. S.
    Zogg, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968034.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Jc
    72.20.My
    Opis:
    On the example of the PbTe and Pb$\text{}_{0.77}$Sn$\text{}_{0.23}$Te on BaF$\text{}_{2}$ the possibility of using the weak magnetic field resistance technique for the evaluation of mismatch-thermally induced strains in semiconductors with multivalley band structure is discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 715-718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminum and its alloys in the very high cycle fatigue regime
    Autorzy:
    Okechukwu, P. Nwachukwu
    Gridasov, Alexander V.
    Talskikh, Kristina Y.
    Grishin, Anton V.
    Nikiforov, Pavel A.
    Sukhorada, Aleksey E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178317.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aluminum alloys
    Crack initiation
    Fatigue failure
    Fatigue limit
    Gigacycle fatigue
    Opis:
    This paper examines the very high cycle fatigue of aluminum alloys used in engineering applications. Specifically taken into consideration are findings of tests and experiments by some scientists and experts in the field of fatigue of structural materials. The examination of the most common material defects that initiate cracks and causes of fatigue failures in aluminum alloys in the very high cycle regime are reviewed. As aluminum alloys are among the most commonly used structural materials that do not exhibit a fatigue limit at 107 load cycles, it became very important to critically review the tests and experiments of experts in the field in order to ascertain the most causes of failures in these alloys. This paper concluded by suggesting the directions for future works in the very high cycle fatigue of aluminum alloys based on the theoretical review.
    Źródło:
    World Scientific News; 2017, 81, 2; 121-131
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Permanent-magnet brushless DC electromotor with tooth coils and self-braking
    Bezszczotkowy silnik prądu stałego o magnesach trwałych, z uzwojeniami na zębach i samohamowaniem
    Autorzy:
    Afanasiev, A.
    Babak, A.
    Efimov, V.
    Nesterin, V.
    Nikiforov, V.
    Spiridonov, A.
    Chihnyaev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/159917.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    silnik bezszczotkowy prądu stałego
    magnes trwały
    moment zaczepowy
    permanent magnet
    brushless DC motors
    influence of slotting
    slotting
    computing torque
    cogging torque
    Opis:
    The electric drives with synchronous gearmotors are obtained generally in actuating constant velocity devices in electroenergetics, heat-power engineering, pipeline transportation today. But they have not only well-known advantages but also essential disadvantages. The permanent magnet brushless DC motor with weakening from rotor permanent magnets and staror tooth coils may be an alternative to this fixed electromotor. The made optimization of cross geometry of PM brushless DC motor is based on the field mathematical model with Nd-Fe-B plastomagnets and six stator teeth. The rating value of moment is 1 Nm, of rotor speed is 750 rpm. It was calculated the width of interpole nonmagnetic arcs which provides the desired value of cogging torque after the stator coils are currentless. It was appreciated the effect of the width of tangent-magneted interpole arcs to the maximum peaks of the cogging torque and the full load torque. It was analysed the possibility to produce the rotor version of magnet ring without m-metal core.
    Napędy elektryczne z synchronicznymi silnikami przekładniowymi są stosowane ogólnie w napędach o stałej prędkości w energetyce, elektrociepłowniach, transporcie rurociągami, ale mają one nie tylko ogólnie znane zalety lecz również istotne wady. Alternatywą może być bezszczotkowy silnik prądu stałego o magnesach trwałych z dodatkowymi uzwojeniami na zębach stojana. Optymalizacja geometrii tego silnika jest oparta na matematycznym modelu pola z magnesami Nd-Fe-B i z sześcioma zębami stojana. Znamionowa wartość momentu wynosi 1 Nm, prędkości obrotowej 750 obr/min. Obliczono szerokość niemagnetycznego łuku między magnesami, która daje żądaną wartość momentu utknięcia, gdy w uzwojeniu statora nie ma prądu. Oceniono wpływ szerokości łuków między biegunami na maksymalną wartość momentu utknięcia i na moment pełnego obciążenia. Przeanalizowano możliwość wykonania wersji pierścienia magnetycznego wirnika bez rdzenia z metalu m.
    Źródło:
    Prace Instytutu Elektrotechniki; 2006, 229; 189-204
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Describing Minor 5-Stars in 3-Polytopes with Minimum Degree 5 and No Vertices of Degree 6 or 7
    Autorzy:
    Batueva, Ts.Ch-D.
    Borodin, O.V.
    Ivanova, A.O.
    Nikiforov, D.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/32361718.pdf
    Data publikacji:
    2022-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    planar graph
    structural properties
    3-polytope
    5-star
    neighborhood
    Opis:
    In 1940, in attempts to solve the Four Color Problem, Henry Lebesgue gave an approximate description of the neighborhoods of 5-vertices in the class P5 of 3-polytopes with minimum degree 5. This description depends on 32 main parameters. (6, 6, 7, 7, 7), (6, 6, 6, 7, 9), (6, 6, 6, 6, 11), (5, 6, 7, 7, 8), (5, 6, 6, 7, 12), (5, 6, 6, 8, 10), (5, 6, 6, 6, 17), (5, 5, 7, 7, 13), (5, 5, 7, 8, 10), (5, 5, 6, 7, 27), (5, 5, 6, 6, ∞), (5, 5, 6, 8, 15), (5, 5, 6, 9, 11), (5, 5, 5, 7, 41), (5, 5, 5, 8, 23), (5, 5, 5, 9, 17), (5, 5, 5, 10, 14), (5, 5, 5, 11, 13) Not many precise upper bounds on these parameters have been obtained as yet, even for restricted subclasses in P5. In 2018, Borodin, Ivanova, Kazak proved that every forbidding vertices of degree from 7 to 11 results in a tight description (5, 5, 6, 6, ∞), (5, 6, 6, 6, 15), (6, 6, 6, 6, 6). Recently, Borodin, Ivanova, and Kazak proved every 3-polytope in P5 with no vertices of degrees 6, 7, and 8 has a 5-vertex whose neighborhood is majorized by one of the sequences (5, 5, 5, 5, ∞) and (5, 5, 10, 5, 12), which is tight and improves a corresponding description (5, 5, 5, 5, ∞), (5, 5, 9, 5, 17), (5, 5, 10, 5, 14), (5, 5, 11, 5, 13) that follows from the Lebesgue Theorem. The purpose of this paper is to prove that every 3-polytope with minimum degree 5 and no vertices of degree 6 or 7 has a 5-vertex whose neighborhood is majorized by one of the ordered sequences (5, 5, 5, 5, ∞), (5, 5, 8, 5, 14), or (5, 5, 10, 5, 12).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2022, 42, 2; 535-548
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cu, Ga and Au Dopants and Technology Conditions on the Magnetic Interactions in $HgCr_2Se_4$ Single Crystals
    Autorzy:
    Krok-Kowalski, J.
    Władarz, G.
    Groń, T.
    Duda, H.
    Pacyna, A.
    Nikiforov, K.
    Rduch, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493008.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    For single crystals $HgCr_2Se_4$ doped by nonmagnetic $Cu^{+},$ $Au^{2+}$ and $Ga^{3+}$ ions and single crystals of $HgCr_2Se_4$ matrix growing in different synthesis conditions both the dc and ac magnetic susceptibility as well as the magnetization have been measured. As it follows from the analysis of the obtained results, paradoxically, the dopants strengthen the long range magnetic interactions of the ferromagnetically ordered single crystals under study, evidenced by the higher values of the ordering temperature in comparison with those ones for pure matrix. An influence of the technological processes connected with deficiency and/or excess of Hg on the long range magnetic interactions was not observed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 970-972
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed Laser Deposition of Amorphous Co-Fe-Ni-Si-B Thin Films
    Autorzy:
    Gareev, R. R.
    Alimpiev, S. S.
    Bugoslavskii, Yu. V.
    Nikiforov, S. M.
    Maslov, A. I.
    Shubnii, G. Yu.
    Zherichin, A. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955481.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.70.Ak
    Opis:
    Soft magnetic multicomponent Co-Fe-Ni-Si-B thin films have been grown by pulsed laser deposition onto single-crystal sapphire and silicon substrates. The static hysteresis measurements for different substrate temperatures are presented. Thin films with a coercive force smaller than 1 Oe were grown at substrate temperatures from 250°C to 350°C. X-ray diffraction measurements proved that the structure of films is amorphous. The surface morphology of grown thin films was observed by scanning electron microscopy. The chemical composition of deposited films corresponds to the composition of bulk alloy.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 321-324
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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