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    Wyświetlanie 1-11 z 11
    Tytuł:
    Simplified procedure for the free vibration analysis of rectangular plate structures with holes and stiffeners
    Autorzy:
    Cho, D. S.
    Vladimir, N.
    Choi, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260556.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    energy approach
    plate with hole
    stiffened panel
    thick plate
    VAPS software
    free vibration analysis
    Opis:
    Thin and thick plates, plates with holes, stiffened panels and stiffened panels with holes are primary structural members in almost all fields of engineering: civil, mechanical, aerospace, naval, ocean etc. In this paper, a simple and efficient procedure for the free vibration analysis of such elements is presented. It is based on the assumed mode method and can handle different plate thickness, various shapes and sizes of holes, different framing sizes and types as well as different combinations of boundary conditions. Natural frequencies and modes are determined by solving an eigenvalue problem of a multi-degree-of-freedom system matrix equation derived by using Lagrange’s equations. Mindlin theory is applied for a plate and Timoshenko beam theory for stiffeners. The applicability of the method in the design procedure is illustrated with several numerical examples obtained by the in-house developed code VAPS. Very good agreement with standard commercial finite element software is achieved.
    Źródło:
    Polish Maritime Research; 2015, 2; 71-78
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the effect of the physicochemical properties of chitosan on its haemostatic activity
    Autorzy:
    Kadyseva, Oksana V.
    Bykov, Vladimir N.
    Strelova, Olga Y.
    Grebenyuk, Alexander N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2131504.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    NMR
    UV/Vis spectroscopy.
    bleeding
    chitosan
    conformation
    haemostasis
    Opis:
    Chitosan are biopolymers that are actively used for the production of local haemostatic agents. The physicochemical characteristics that determine its biological properties include the molecular weight and the deacetylation degree. However, there is no linear relationship between these parameters and haemostatic activity. The most reliable method of confirming the effectiveness is still in vivo experiments. The ability to initiate haemostasis depends on the conformational transition of chitosan macromolecules. The highest efficiency in vitro was for samples in which the transition of a significant part of the molecules from the ‘rigid rod’ state to the ‘globule’ occurred at physiological pH. It is proposed to expand the list of indicators of chitosan that can be controlled to evaluate the quality of raw materials, related to haemostatic activity, to include the definition of the conformational transition at physiological pH.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2021, 26; 112-120
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Aerobic Performance of Athletes on Polymorphism of Genes
    Autorzy:
    Drozdovska, Svitlana B.
    Lysenko, Olena M.
    Dosenko, Victor E.
    Ilyin, Vladimir N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055065.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    aerobic performance
    gene polymorphisms
    molecular-genetic markers
    sport selection
    Opis:
    The adaptation of an athlete to systematic physical exercise has been shown to be determined by a combination of great many genes. The aim of our study was to investigate the dependence of the aerobic capacity parameters in sport on the set of gene polymorphisms. Cardio-respiratory system (CRS) adaptation reactions to exercise of 72 endurance athletes were assessed using the gas analysis. The analysis of the obtained results has shown both single and combined effect of the gene polymorphisms on the aerobic capacity. The impact of 6 polymorphisms on the aerobic performance level was analyzed: Т–786→С polymorphism of the promoter of еNOS gene as well as АСЕ I/D polymorphism, Рго/Ala polymorphism of PPARG gene, G/C polymorphism of PPARA gene, Pro582Ser polymorphism of HIF1α gene, and Ala203Pro polymorphism of PPARGC1B. It was found that a single impact on the HRmax providing АСЕ I/D polymorphism. Individual influence of АСЕ gene accounts for 2% of this index dissipation. Results showed that there is a dependence between the amount the maximum volume of consumed oxygen (VO2max) from the set of gene polymorphisms. Cumulative impact of these polymorphisms in the combination with the individual parameters (gender; qualification; kind of sport) stipulates 71% of dispersion of VO2max value.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2015, 9, 1; 65-73
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relativistic effects in the rotation of dwarf planets and asteroids
    Autorzy:
    Pashkevich, Vladimir V.
    Vershkov, Andrey N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174937.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    relativistic effects
    geodetic rotation
    Solar System bodies
    rotation of dwarf planets
    rotation of dwarf asteroids
    exoplanetary systems bodies
    Opis:
    The effect of the geodetic rotation (which includes two relativistic effects: geodetic precession and geodetic nutation) is the most significant relativistic effect in the rotation of the celestial bodies. For the first time in this research, this relativistic effect is determined in the rotation of dwarf planets (Ceres, Pluto, and Charon) and asteroids (Pallas, Vesta, Lutetia, Europa, Ida, Eros, Davida, Gaspra, Steins, and Itokawa) in the Solar System with known values of their rotation parameters. Calculations of the values of their geodetic rotation are made by a method for studying any bodies in the Solar System with a long-term ephemeris. Values of geodetic precession and geodetic nutation for all these celestial bodies were calculated in ecliptic Euler angles relative to their proper coordinate systems and in their rotational elements relative to the fixed equator of the Earth and the vernal equinox (at the epoch J2000.0). The obtained analytical values of the geodetic rotation for the celestial bodies can be used to numerically investigate their rotation in the relativistic approximation, and also used to estimate the influence of relativistic effects on the orbital–rotational dynamics for the bodies of exoplanetary systems.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2022, 57, 3; 158--184
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Distortion Mechanisms Used in Rotary Steerable Systems
    Autorzy:
    Ivanova, Tatyana N.
    Božek, Pavol
    Korshunov, Aleksandr I.
    Koretskiy, Vladimir
    Powiązania:
    https://bibliotekanauki.pl/articles/2064845.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    rotary steerable system
    distortion mechanisms
    horizontal wells
    crookedness increase
    horizontal well holes
    Opis:
    Drilling with a rotary steerable system, the mechanical drilling speed increases by two times compared to drilling with a screw bottom-hole motor, which provides significant savings drilling-time. The effective length of the horizontal elbow increases, which enables to increase the production rate more than twice. It is found that in comparison with the bottom hole motor, rotary steerable system provides drilling smoother barrel, which reduces the risk of accidents to come out. The dependence between the type of the bent housing and the most rational fields of its application is revealed, recommendations on the choice of the rotary steerable system for various issues of directional drilling are developed.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 331--346
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of International Experience of Creation and Protection of Critical Infrastructure for Implementation in Ukraine
    Autorzy:
    Uriadnykova, Inga V.
    Karmazyn, Serhii V.
    Teslenko, Aleksandr N.
    Lebedev, Vladimir G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1832488.pdf
    Data publikacji:
    2015
    Wydawca:
    Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
    Tematy:
    critical infrastructure
    sectors and benchmarks
    Opis:
    The analysis of international experience of creation and protection of critical infrastructure is given. The definition of the term “critical infrastructure” is given too. The areas of critical infrastructure protection mechanisms in Ukraine are shown.
    Źródło:
    Security Dimensions; 2015, 16(16); 76-88
    2353-7000
    Pojawia się w:
    Security Dimensions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE EFFECTS OF SULFUR-CONTAINING COMPOUNDS ON REDOX STATUS IN HOMOCYSTEINE-TREATED RATS
    Autorzy:
    Sobot, Tanja S.
    Zivkovic, Vladimir I.
    Srejovic, Ivan M.
    Jeremic, Jovana N.
    Nikolic Turnic, Tamara R.
    Ponorac, Nenad D.
    Petkovic, Anica M.
    Jakovljevic, Vladimir L.
    Djuric, Dragan M.
    Powiązania:
    https://bibliotekanauki.pl/articles/895260.pdf
    Data publikacji:
    2019-02-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    oxidative stress
    homocysteine
    N-acetylcysteine
    L-cysteine
    L-methionine
    sulfur amino acids
    Opis:
    There is growing interest in the activity of sulfur-containing compounds on redox balance in physiological and pathological conditions, considering that some of these compounds have not only antioxidative but also pro-oxidative activities. Aim of this study was to assess possible differences in the effects of various sulfur-containing compounds on redox balance of cardiovascular system in its physiological state and in the early onset of hyperhomocysteinemia. This experimental study divided Wistar albino rats into two groups: saline-treated (control) and DL-homocysteine-treated (experimental group). Rats from experimental group were subjected to subchronic subcutaneous administration of DL-homocysteine at dose of 0.45 μmol/g body weight twice a day for 2 weeks. At the end of this period, rats were sacrificed, and blood samples were collected to be analysed for homocysteine concentration and systemic oxidative stress. Isolated rat hearts were excised and attached to the Langendorff apparatus. To assess the effects of acute administration of L-methionine, L-cysteine, N-acetylcysteine, and sodium hydrogen sulfide, the hearts were perfused individually with each of the mentioned substances at same single dose of 0.5 mmol/l for 5 min. In collected samples of coronary venous effluent oxidative stress biomarkers were determined using spectrophotometry. Total homocysteine level was significantly higher in the experimental group than in the control group, and the effects of applied sulfur-containing compounds were significantly different in experimental and control groups. DL-homocysteine induced considerable changes in functioning of cardiovascular system even before an increase in plasma homocysteine values, and action of sulfur-containing compounds varied depending on the presence of homocysteine.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 147-157
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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