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    Tytuł:
    Comparison of analytical and the FEM method for deriving the Mode I stress intensity factor of thin-walled beams containing a crack
    Autorzy:
    Djoković, J. M.
    Vulović, S. D.
    Nikolić, R. R.
    Živković, M. M.
    Bujnak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/131642.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Komisja Inżynierii Budowlanej PAN Oddział w Katowicach
    Tematy:
    cracked thin-walled beams
    modeI SIF
    cross-section warping
    FEM
    J-EDI
    belka cienkościenna
    współczynnik intensywności naprężeń
    MES
    Opis:
    The problem considered in this paper is of the cracked thin-walled beams. They are subjected to combined loading by the bending moment and the axial force. The profiles with the I (H), T and U cross-sections were analyzed. The analytical method is based on application of classical expressions for Mode I SIF of such beams with taking into account the cross sections' warping. The classical expressions for SIF for the thin plate are adapted by including the reduced forces and moments characteristic for the thin-walled beams. The numerical simulation for calculating the stress intensity factor of the cracked thin-walled beams consisted of application of the Finite Element Method (FEM) by use of the J-EDI method. It is found that the Mode I SIF of cracked thin-walled beams increases with crack length increase. The conducted comparison of results obtained by application of the two methods confirms the validity of the proposed analytical expressions only for the small crack lengths.
    Źródło:
    Roczniki Inżynierii Budowlanej; 2015, 15; 43-51
    1505-8425
    Pojawia się w:
    Roczniki Inżynierii Budowlanej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of blocks’ topologies on endothelial shear stress observed in CFD analysis of artery bifurcation
    Autorzy:
    Blagojevic, M.
    NIkolic, A.
    Živkovic, M.
    Stankovic, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/306720.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    artery bifurcation
    topology of blocks
    endothelial shear stress
    CFD
    FEM
    PAK
    układ krwionośny
    metoda elementów skończonych
    Opis:
    It is well known that endothelial shear stress affects occurrence of plaque in arteries. Lack of a method for measuring this physical quantity limits scientific understanding of this phenomenon. Application of numerical methods in this area has considerable amount of experimental verifications in terms of quantities that can be measured (velocity, pressure). On that basis we can rely on the results of endothelial shear stress calculations. The literature mainly documents the application of numerical methods to average geometries. However, arterial bifurcations are patient-specific. Moreover, occurrence of disease significantly complicates the geometry of the arteries and bifurcations. A multiblock concept provides the necessary geometrical flexibility and computational efficiency to generate patientspecific finite element models. For a particular class of problems different topologies of blocks are possible. This paper provides an overview of the possible block topologies required in finite element modeling using multiblock approach. In order to obtain accurate results of endothelial shear stress, two most general topologies are examined by numerical calculations. Favorable topology of the blocks is implemented in in-house software stl2fem.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 97-104
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of value innovation potential under transitional conditions in Serbia
    Autorzy:
    Živković, D.
    Manasijević, D.
    Štrbac, N.
    Niculović, M.
    Živadinović, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/406835.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovation
    value innovation potential
    transition
    Opis:
    Nowadays, business environment is faster than ever in the field of new technologies. The firms are forced to find new ways to compete and survive through innovations. To meet these demands, different tools and techniques are used in order to measure capability of firms to innovate. One of them is the Value Innovation Potential Assessment Tool, which helps to identify appropriate opportunities for firms to use it to assess their effectiveness of innovation work. The main goal of this paper was to investigate the Value Innovation Potential under transitional conditions in some firms in South-Eastern Serbia. The research was done using a questionnaire taken from literature, which was applied to one hundred employees in mentioned Serbian firms. The data were statistically analysed, explained and main conclusions were obtained. Proposed factor model of Value Innovation Potential was tested using confirmatory factor analysis (CFA) on investigated population.
    Źródło:
    Management and Production Engineering Review; 2015, 6, 2; 82-88
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Samarium-Doped Ceria Nanostructured Thin Films Grown on FTO Glass by Electrodepostion
    Autorzy:
    Živković, Lj.
    Lair, V.
    Lupan, O.
    Cassir, M.
    Ringuedé, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503528.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    68.55.Ln
    61.46.Km
    78.67.-n
    Opis:
    Electrical, optical or catalytic properties of ceria can be tuned via doping by rare earth elements. The innate properties of ceria-based materials can be further amplified by using nanostructured ceria. In this study, Sm-doped ceria (SDC) coatings were grown on the FTO glass substrate by means of cathodic deposition. Films were obtained from mixed $Sm^{3+}//Ce^{3+}$ aqueous nitrate solutions, applying -0.8V/(SCE) potential for 1 h. Selected conditions gave rise to adherent, homogeneous and well-covering nanostructured SDC thin films. EDX analysis showed that 0.8 and 1.5 mol% $Sm^{3+}$ led to 3.4 and 6.3 at.% Sm in the SDC films. XRD and Raman analysis confirmed the formation of cubic fluorite-type $CeO_{2}$. However, Sm-doping decreased the crystallite size of nanostructured ceria. The effect of annealing on SDC film was also studied. An improvement in crystallite quality was found with increasing temperature. Optical absorption properties were studied and the band gap value $(E_g)$ of 3.07 eV was determined for pure ceria. Sm-doped ceria exhibited a red shifting. The $E_g$ values were 2.97 and 2.81 eV, in due order.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 298-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical modeling of copper losses in the silicate slag of the sulfide concentrate smelting process
    Autorzy:
    Savic, M. V.
    Djordjevic, P. B.
    Mihajlovic, I. N.
    Zivkovic, Z. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/778781.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    modeling
    copper concentrate
    smelting process
    copper losses
    slag
    ANFIS
    Opis:
    This article presents the results of the statistical modeling of copper losses in the silicate slag of the sulfide concentrates smelting process. The aim of this study was to define the correlation dependence of the degree of copper losses in the silicate slag on the following parameters of technological processes: SiO2, FeO, Fe3O4, CaO and Al2O3 content in the slag and copper content in the matte. Multiple linear regression analysis (MLRA), artificial neural networks (ANNs) and adaptive network based fuzzy inference system (ANFIS) were used as tools for mathematical analysis of the indicated problem. The best correlation coefficient (R2 = 0.719) of the final model was obtained using the ANFIS modeling approach.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 62-69
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of meat traits and fatty acids profile from Swallow-Belly Mangalitsa, Moravka pigs and their crossbreeds
    Parametry jakości mięsa i profil kwasów tłuszczowych świń rasy mangalica jaskółcza, morawka oraz ich mieszańców
    Autorzy:
    Migdal, L.
    Radovic, C.
    Zivkovic, V.
    Gogic, M.
    Migdal, A.
    Migdal, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2926.pdf
    Data publikacji:
    2018
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Animal Science; 2018, 57[4]
    1898-8830
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Animal Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal, Structural and Electrical Properties of Some Bi-Cu-Ni Alloys
    Struktura, właściwości termiczne i elektryczne wybranych stopów Bi-Cu-Ni
    Autorzy:
    Marković, B.
    Živković, D.
    Manasijeyić, D.
    Sokić, M.
    Minić, D.
    Talijan, N.
    Stajić-Trošić, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353349.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bi-Cu-Ni alloys
    lead-free solders
    characterization
    stopy Bi-Cu-Ni
    luty bezołowiowe
    charakterystyka
    Opis:
    The Bi-Cu-Ni ternary system belongs to the group of potential Cu-Ni-based advanced lead-free solder materials for high temperature application. In this study microstructure investigation of the slow-cooled Bi-Cu-Ni samples was done using SEM-EDS analysis. The samples compositions were chosen along three cross-sections with molar ratio Cu:Ni=1:3, 1:1 and 3:1. The experimentally obtained phase structure was compared with the results of thermodynamic calculation according to CALPHAD method. Also, new results regarding thermal and electrical properties investigations of these alloys are presented in this paper, based on DSC and electroconductivity measurements.
    Trójskładnikowe stopy Bi-Cu-Ni należą do grupy potencjalnych zaawansowanych bezołowiowych materiałów do lutowania w wysokiej temperaturze opartych na stopach Cu-Ni. Analizę mikrostruktury wolno schłodzonych próbek Bi-Cu-Ni wykonano za pomocą technik SEM-EDS. Do badań wybrano próbki charakteryzujące się stałym molowym stosunkiem Cu:Ni=1:3, 1:1 i 3:1. Doświadczalnie otrzymaną strukturę faz porównano z wynikami obliczeń termodynamicznych metodą CALPHAD. Ponadto, nowe wyniki dotyczące badań właściwości cieplnych i elektrycznych stopów zostały przedstawione w tym artykule, na podstawie pomiarów DSC i przewodności elektrycznej.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 117-120
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pozytywne i negatywne aspekty stosowania olejow roslinnych w zywieniu swin
    Autorzy:
    Migdal, W
    Barowicz, T.
    Borowiec, F.
    Koczanowski, J.
    Pieszka, M.
    Wojtysiak, D.
    Pasciak, P.
    Zivkovic, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/833271.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    pasze
    zywienie zwierzat
    trzoda chlewna
    oleje roslinne
    feed
    animal feeding
    pig
    plant oil
    Źródło:
    Rośliny Oleiste - Oilseed Crops; 2004, 25, 2; 561-572
    1233-8273
    Pojawia się w:
    Rośliny Oleiste - Oilseed Crops
    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
    Tytuł:
    TYROSINASE INHIBITORY AND ANTIOXIDANT ACTIVITY OF WILD ROSA CANINA L. AND SORBUS AUCUPARIA L. FRUIT EXTRACTS
    Autorzy:
    Stanković, Milica I.
    Savić, Vesna L.
    Živković, Jelena V.
    Stanojević, Ljiljana P.
    Tadić, Vanja M.
    Arsić, Ivana A.
    Powiązania:
    https://bibliotekanauki.pl/articles/895312.pdf
    Data publikacji:
    2019-06-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    antioxidants
    polyphenols
    Rosa canina L
    Sorbus aucuparia L
    anti-tyrosinase
    Opis:
    In the present work, fruits from two plant species, Rosa canina L. and Sorbus aucuparia L., popular in traditional folk medicine in Serbia, were studied. The aim was to examine and compare the efficiency of the ultrasonic extraction with different solvents regarding physicochemical properties, polyphenolic profile of extracts, as well as their tyrosinase inhibitory and antioxidant activity. The polyphenols evaluation indicated that water was the best solvent for a thorough extraction of bioactive compounds from the R. canina fruits, while propylene glycol-water (45:55, v/v) was the most efficient regarding S. aucuparia fruits, followed by ethanol-water (7:3, v/v). Only flavonoids were more abundant in S. aucuparia fruit extracts. R. canina water extracts showed a higher antioxidant activity, using several in vitro tests with different working principles. However, S. aucuparia ultrasonic extracts with propylene glycol-water (45:55, v/v) demonstrated a higher potential concerning tyrosinase inhibitory and chelating activity. Therefore, these ultrasonic extracts, being great sources of natural anti-tyrosinase inhibitors and antioxidants, can be considered as promising candidates suitable for pharmaceutical application, as great sources of natural anti-tyrosinase inhibitors and antioxidants.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 3; 523-533
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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