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    Wyświetlanie 1-9 z 9
    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:
    Synthesis, Characterization and Adsorptive Properties οf Organobentonites
    Autorzy:
    Jović-Jovičić, N.
    Milutinović-Nikolić, A.
    Banković, P.
    Dojčinović, B.
    Nedić, B.
    Gržetić, I.
    Jovanović, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538150.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    61.05.cp
    68.43.-h
    78.40.-q
    82.65.-r
    Opis:
    In this paper partial and complete substitution of cations in the interlayer region of clay with different amounts of two aliphatic ammonium cations was performed with aim of synthesis of organobentonites with multipurpose adsorption properties. Domestic clay from Bogovina was submitted according to a common procedure used for the obtention of organobentonite, which comprises the following steps: grinding, sieving, Na-exchange, cation exchange and drying. The samples were characterized by X-ray diffraction and infrared spectroscopy. The incorporation of surfactant molecules into smectite structure lead to constant increase of $d_{001}$ basal spacing. IR absorption bands assigned to methyl and methylene vibrations increased with the increase of surfactant/bentonite ratio and length of aliphatic chain in surfactant molecules. Adsorptive properties of the obtained materials were in accordance with their organophylicity: the adsorption of organic dye increased while the rate of removal of $Pb^{2+}$ by adsorption decreased.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 849-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Characterization and Application οf Al,Fe-Pillared Clays
    Autorzy:
    Banković, P.
    Milutinović-Nikolić, A.
    Jović-Jovičić, N.
    Dostanić, J.
    Čupić, Ž.
    Lončarević, D.
    Jovanović, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808061.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.C-
    61.43.Gt
    61.46.-w
    68.43.-h
    82.65.+r
    Opis:
    Al,Fe-pillared clay was synthesized from domestic clay from Bogovina according to a common procedure: grinding, sieving, Na exchange, pillaring, drying and calcination. Two synthesized samples differing only in calcining conditions were prepared. Phase composition and textural properties of the starting clay and synthesized pillared clays were characterized using X-ray diffraction and physisorption of nitrogen. Catalytic tests were performed using sample with better textural properties being the one submitted to milder calcining conditions. Catalytic wet peroxide oxidative degradation of aromatic compounds phenol and tartrazine on the synthesized catalyst was confirmed showing better efficiency in the case of tartrazine.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 811-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing of self-(in)compatibility in apricot cultivars using fluorescence microscopy
    Testowanie (nie)samopłonności u odmian moreli przy użyciu mikroskopu fluorescencyjnego
    Autorzy:
    Milatović, D.
    Nikolić, D.
    Fotirić-Akšić, M.
    Radović, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542467.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    apricot
    plant cultivar
    fluorescence microscopy
    Prunus armeniaca
    pollination
    pollen tube growth
    pistil
    Opis:
    Self-incompatibility is common in apricot (Prunus armeniaca L.) cultivars of Central Asian and Irano-Caucasian ecogeographical groups, while cultivars of European group are traditionally considered as self-compatible. However, the number of known self-incompatible cultivars of the European group has increased rapidly over the last two decades. This can be explained by using Asian or North American self-incompatible cultivars in breeding programs that aim to create new genotypes with the traits including: Plum Pox Virus resistance, frost tolerance, increase of the sugar content or extending the harvest time. In this work self-(in)compatibility was tested in 38 apricot cultivars. Pollentube growth in pistils pollinated in laboratory was analysed using fluorescence microscopy. Cultivars were considered self-compatible if at least one pollen tube reached the ovary in the majority of pistils. In self-incompatible cultivars growth of pollen tubes in the style of pistil stopped along with formation of characteristic swellings. Of the examined cultivars, 17 were self-compatible, and 21 were self-incompatible.
    Niesamopłonność jest powszechna u odmian moreli (Prunus armeniaca L.) w środkowo-azjatyckich i irańsko-kaukaskich grupach eko-geograficznych, natomiast odmiany grupy europejskiej są tradycyjnie uważane za samopłonne. Jednak liczba znanych samopłonnych odmian grupy europejskiej gwałtownie wzrosła podczas ostatnich dwóch dziesięcioleci. Można to wyjaśnić, używając azjatyckich i północno-amerykańskich samopłonnych odmian w programach hodowlanych, które mają na celu stworzenie nowych genotypów o cechach obejmujących odporność na Plum Pox Virus, tolerancję na mróz, wyższą zawartość cukru czy przedłużony okres zbiorów. W niniejszej pracy testowano samo(nie)płonność u 38 odmian moreli. Przy użyciu mikroskopu fluorescencyjnego przeanalizowano wzrost łagiewki pyłkowej na słupkach zapylonych w laboratorium. Odmiany uważano za samopłonne, jeśli przynajmniej jedna łagiewka pyłkowa docierała do zalążni na większości słupków. U odmian niesamopłonnych wzrost łagiewki pyłkowej na szyjce słupka zatrzymał się wraz z wytworzeniem się charakterystycznych zgrubień. Spośród badanych odmian, 17 było samopłonne, natomiast 21 odmian było niesamopłonnych.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2013, 12, 6; 103-113
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor
    Autorzy:
    Krmpot, A.
    Ćuk, S.
    Nikolić, S.
    Radonjić, M.
    Grujić, Z.
    Jelenković, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791239.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    42.50.Gy
    42.62.Fi
    32.30.Jc
    Opis:
    Influence of two different laser beam profiles, the Gaussian and the Π (top hat) profile on the resonance line widths and amplitudes in the Hanle electromagnetically induced transparency was studied. The laser beam propagates through the vacuum Rb glass cell. Studies were done at $D_1$ line for the open $\text{}^{87}Rb:$ $F_{g}$=2 → $F_{e}$=1 transition. Hanle electromagnetically induced transparency was measured for the two beam profiles with the same total power and beam diameter and experimental results showed that Gaussian and the top hat profiles give different amplitudes and widths of the Hanle resonances. Resonances obtained from the top hat laser beam profile have lower amplitudes and higher line widths.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 563-565
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of cultural practices on weeds community in function of potato yield
    Wplyw praktyk uprawowych na zbiorowisko chwastów w plonie ziemniaka
    Autorzy:
    Ilić, O.
    Nikolić, L.
    Ilin, Ž.
    Mišković, A.
    Vujasinović, V.
    Kukić, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543510.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    In the paper are presented results of three years studies performed in the period 2008–2010 on effects of cultural practices in stands of Panico-Galinsogetum Tx. et Beck. 1942. association in conventional potato production on the experimental plots in the vicinity of Becej (Northern Serbia). Composition of association Panico-Galinsogetum in experimental control variant builds 31 weed species. From Panico-Galinsogetum community, in the variant with one cultivation (with earthing up) without herbicide applying was found 22 weed species, and at the variant with two cultivation without herbicide 17 weed species, respectively. Herbicide treatments of potato crops as well as cultivation led to significant impoverishment of the weed flora, i.e., reduction in number of weed species, their coverage value, as well as the degree of presence in potato crop. Due to reduction of weed infestation, in variants untreated by herbicides, by application of two cultivations, achieved potato yield was for 8% higher in comparison to the variant with one cultivation. In variants treated by herbicides, potato yield was for 32% higher in relation to the yield on untreated experimental variants. The average number of tubers per plant achieved in variants treated by herbicides was for 40% higher in comparison to the number of tubers in untreated variants. In both cases, in comparison to control variant, cultivation resulted in significantly higher number of tubers per plant.
    Praca przedstawia rezultaty trzech badań przeprowadzonych w latach 2008–2010 i dotyczących wpływu praktyk uprawowych na stanowiskach Panico-Galinsogetum Tx. et Beck. 1942 w konwencjonalnej produkcji ziemniaka na poletkach doświadczalnych w pobliżu Becej (Północna Serbia). Skład Panico-Galinsogetum w wariancie kontroli doświadczenia obejmował 31 gatunków chwastów. W wariancie z jednym zabiegiem (z przysypywaniem ziemią) bez herbicydu znaleziono 22 gatunki chwastów z Panico-Galinsogetum, a w wariancie z dwoma zabiegami bez herbicydu stwierdzono 17 gatunków. Zastosowanie herbicydów w uprawie ziemniaka doprowadziło do znacznego zubożenia flory chwastów, tzn. do redukcji liczby chwastów, ich wartości rozprzestrzeniania się oraz obecności w uprawie ziemniaka. Dzięki zmniejszeniu zachwaszczenia w wariantach bez herbicydów zastosowanie dwóch zabiegów doprowadziło do plonu ziemniaka o 8% większego w porównaniu z wariantem z jednym zabiegiem. W wariantach z herbicydami plon ziemniaka był o 32% większy w porównaniu z plonem w wariantach bez zabiegów. Średnia liczba bulw na roślinę w wariantach z herbicydami była o 40% większa w porównaniu z liczbą bulw w wariantach bez zabiegów. W obydwu przypadkach zabieg dał istotnie większą liczbę bulw na roślinę w porównaniu z kontrolą.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 5; 31-43
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unusual growth of pollen tubes in the ovary of quince (Cydonia oblonga Mill.)
    Autorzy:
    Radović, A.
    Nikolić, D.
    Cerović, R.
    Milatović, D.
    Đorđević, B.
    Zec, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543531.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    This paper presents the results of a three-year research (2010–2012) of unusual growth of pollen tubes in the ovary in eight cultivars of quince in two pollination variants (self-pollination and open-pollination). Unusual behavior of pollen tubes growth could be seen in all parts of the ovary, and it was most often manifested by larger or smaller branching and the formation of bundle in the ovary, without signs of further penetration of pollen tubes to the ovule. In addition, in a small number of cases, branching of the pollen tubes, as well as bypassing micropyle and forming swellings at the tips of the pollen tube was noticed. There were also the cases where the pollen tube filled embryo sac forming a bundle in it. The occurrence of unusual growth of pollen tubes in the quince ovary was primarily dependent on the genotype and pollination type. This phenomenon was more expressed in open-pollination than in self-pollination variant in all examined cultivars. Leskovacka cultivar was characterized by the highest percentage of unusual growth of pollen tubes in both variants of pollination, as follows: 13.23% (self-pollination) and 15.89% (open-pollination).
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 2; 133-138
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Multidisciplinary Approach to Teaching Metals as Part of the Elementary School Curriculum in Serbia
    Autorzy:
    Nikolić, Ružica S.
    Kostic, Danijela A.
    Krstic, Nenad S.
    Trajković, Aleksandar
    Stojanović, Nena
    Powiązania:
    https://bibliotekanauki.pl/articles/2031648.pdf
    Data publikacji:
    2014-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    teaching metals
    elementary school
    Opis:
    The multidisciplinary approach to the study of metals which we are proposing includes the modernization of the curricular content and its connection with everyday life. The use of additional teaching material in elementary schools in rural and urban areas in the wider region of the city of Niš has contributed to increased interest and activities on the part of the schoolchildren, which has in turn led to a significant quantitative improvement in their knowledge of chemistry in general, but also of metals in particular. All of the schoolchildren achieved a satisfactory level of knowledge (>50%) following the implementation of the expanded curriculum.
    Źródło:
    The New Educational Review; 2014, 36; 95-103
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and distributional patterns of the invasive flora in a protected mountain area - a case study of Medvednica Nature Park (Croatia)
    Autorzy:
    Vukovic, N.
    Bernardic, A.
    Nikolic, T.
    Hrsak, V.
    Plazibat, M.
    Jelaska, S.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/56776.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    distribution pattern
    invasive flora
    flora
    protected area
    mountain area
    Medvednica Nature Park
    Croatia
    invasive plant
    alien plant
    dispersal strategy
    habitat
    regression
    Opis:
    In this paper we have analysed invasive flora of Medvednica Nature Park, Croatia with respect to their origins, life forms, systematic positions, types of seed dispersal, Ellenberg indicator values and spatial distributions using MTB 1/64 grid units for analyses. A total of 27 invasive plant species, belonging to 14 families, were recorded with Asteraceae being the most frequently occurring family. Therophytes were the most common life form, as is generally true of Croatian invasive plants; however, hemicryptophytes and geophytes were more frequent in Medvednica. Here, invasive plants originated mainly from both Americas with slightly lower portion in comparison to all Croatian invasive plants, while contrary was the case when comparing those originated from Asia. The most widespread species was Erigeron annuus (L.) Pers., and the species with the lowest occurrence were Chamomilla suaveolens (Pursh.) Rydb and Datura innoxia Mill. A multiple regression model explains 44% of the spatial variability in the invasive plants data per MTB 1/64 unit, using the number of all recorded plant species, the average elevation and the lengths of paths and roads as estimators. The latter two variables also had the most influence on the ordination axes in analyses of the spatial distribution of seed dispersal types present in each MTB 1/64 unit. Anemochory was the most frequent type of seed dispersal.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2010, 79, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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