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    Wyświetlanie 1-9 z 9
    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:
    Structure and Magnetic Properties of Nanocrystalline $NiFe_{2}O_{4}$ Prepared via Precipitation Route
    Autorzy:
    Žák, T.
    David, B.
    Ćosović, A.
    Ćosović, V.
    Živković, D.
    Talijan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1378217.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Tt
    81.07.Bc
    81.07.Wx
    Opis:
    Nanocrystalline Ni-ferrite was synthesized by modified precipitation method in which soluble starch is used as dispersing agent and $Na_{2}CO_{3}$ as a precipitating agent. $NiSO_{4}·6H_{2}O$ and $Fe(NO_{3})_{3}·9H_{2}O$ were used as precursors for nickel and ferric oxide, respectively. The obtained nanocrystalline Ni-ferrite was analysed and discussed through structural, compositional and magnetic characterization. Formation of pure $NiFe_{2}O_{4}$ phase with average crystallite size of 21 nm has been confirmed by X-ray diffraction analysis (XRD). The determined phase composition was additionally supported by results of $\text{}^{57}Fe$ Mössbauer phase (MS) analysis and material's nanocrystalline structure by field emission scanning electron microscopy (FE-SEM). Thermomagnetic behaviour was studied up to 800 °C. The obtained room temperature magnetic hysteresis loop, recorded by means of a vibrating sample magnetometer (VSM), exhibits characteristic "S" shape of the soft magnetic material with the measured coercivity of about 10 kA/m and the specific moment up to 40 $Am^{2}$/kg.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 142-143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    Structural Characterization and Statistical Properties of Two-Dimensional Granular Systems During the Compaction
    Autorzy:
    Živković, S.
    Jakšić, Z.
    Arsenović, D.
    Budinski-Petković, Lj.
    Vrhovac, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503325.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    45.70.-n
    45.70.Cc
    81.05.Rm
    61.43.Bn
    Opis:
    We study the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking, by numerical simulation. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second phase of the shake cycle is based on an efficient event-driven molecular-dynamics algorithm. We analyze the compaction dynamics for various values of the friction coefficient and the coefficient of normal restitution. The granular organization at local level was studied by analyzing the shape factor ξ of the local volumes, associated with a natural way of subdividing the volume into local parts - the Voronoi partition. It gives a clear physical picture of the competition between less and more ordered domains of particles during the compaction. We calculate the distribution of the shape-factor for packings at different stages of the compaction process. We have also investigated a two-dimensional granular medium experimentally. We prepared the granular packings of metallic cylinders of diameters 4, 5, and 6 mm. The distributions of the shape-factor obtained numerically for various tapping intensities are consistent with our experimental results.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 246-251
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phenotypic plasticity of European beech (Fagus sylvatica L.) stomatal features under water deficit assessed in provenance trial
    Autorzy:
    Stojnic, S.
    Orlovic, S.
    Trudic, B.
    Zivkovic, U.
    von Wuehlisch, G.
    Miljkovic, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/41311.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    phenotypic plasticity
    European beech
    Fagus sylvatica
    stomatal feature
    water deficit
    provenance trial
    Opis:
    The results of research into leaf stomatal variability of five European beech provenances originating from Austria, Bosnia and Hercegovina, Germany, Romania and Serbia are presented in this paper. Aim of the study was to investigate how stomatal traits of provenances originating from different environments change in response to drought stress and to assess the phenotypic plasticity of the stomatal features investigated. The study was conducted during two different years, characterized by contrasting weather conditions (2010 and 2011). Two-way ANOVA revealed that provenances differ significantly in terms of stomatal density (SD), width of stomatal aperture (Wb), potential conductance index (PCI) and relative stomatal pore surface (RSPS), during both seasons. In a dry year (2011) all provenances significantly increased stomatal density by between 16.1% (Hasbruch – DE) and 21.9% (Cer – SRB). Guard cell length (LA) was not statistically different among provenances in either year (2010 and 2011), even though LA decreased in the dry year (2011) in all provenances. Reaction norms were steep in most of the parameters suggesting the possibility of a plastic response of provenances toward changes in soil water regime, influenced by the prevailing weather each year. Phenotypic plasticity indices were the highest in regards of SD, PCI and RSPS, indicating that these traits would be good candidates for improvement in breeding programs aimed at selection of drought resistant.
    Źródło:
    Dendrobiology; 2015, 73
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Phenolic Composition, and Antioxidant and Antineurodegenerative Potential of Methanolic Extracts of Fruit Peel and Flesh of Pear Varieties from Serbia
    Autorzy:
    Savić, Aleksandra
    Alimpić Aradski, Ana
    Živković, Jelena
    Šavikin, Katarina
    Jarić, Snežana
    Marin, Petar D.
    Duletić-Laušević, Sonja
    Powiązania:
    https://bibliotekanauki.pl/articles/1363265.pdf
    Data publikacji:
    2021-06-10
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    pear fruit
    traditional varieties
    methanolic extracts phenolic composition
    antioxidant activity
    antineurodegenerative activity
    Opis:
    Pear (Pyrus communis L.) is consumed as fresh fruit, in numerous food products, and also used as a traditional remedy in various countries, including Serbia. In search of bioactive compounds, six traditional pear varieties (‘Vidovača’, ‘Lubeničarka’, ‘Karamanka’, ‘Jeribasma’, ‘Lončara’, ‘Takiša’) and wild pear from Serbia were investigated and compared with a commercial variety (‘Williams Bartlett’). The aim of this study was to determine the total phenolic and flavonoid contents, phenolic composition, antioxidant capacity, and antineurodegenerative activities of methanolic extracts of peel, flesh, and mixed peel and flesh of pear fruits. Phenolic composition of extracts was determined with HPLC-DAD, while the antioxidant activity of extracts was evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), and ferric-reducing antioxidant power (FRAP) assays. Bearing in mind that oxidative stress is closely linked to neurodegeneration, the antineurodegenerative potential of the extracts was assessed by the inhibition of acetycholineserase (AChE) and tyrosinase (TYR) activities. The extracts of traditional varieties, particularly peel extracts, had a high content of phenolics, as well as significant antioxidant and moderate antineurodegenerative potential, compared to the commercial variety. The highest contents of total flavonoids and individual compounds, such as arbutin and chlorogenic acid, as well as the strongest antioxidant and TYR inhibitory activities were reported for the ‘Takiša’ peel extract. The performed analyses have revealed that fruits of traditional Serbian pear varieties are rich in bioactive components and could be used as functional food and for possible nutraceutical applications, to prevent diseases induced by oxidative stress.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2021, 71, 2; 225-236
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    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 1-9 z 9

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