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    Wyświetlanie 1-9 z 9
    Tytuł:
    The effects of B₄C amount on hardness and wear behaviours of 7075-B₄C composites produced by powder metallurgy method
    Autorzy:
    Ay, H.
    Özyürek, D.
    Yıldırım, M.
    Bostan, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1155410.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    Opis:
    In this study, the effects of B₄C amount on hardness and wear behaviours of 7075 Al-B₄C composites produced by powder metallurgy method were investigated. Within the scope of work, different amount of B₄C (3, 6, 9%) added into gas atomized 7075 Al powders. The powders were mixed in Turbula with 67 rpm for 45 min. Then the composite powders were pre-shaped by cold pressing under 600 MPa pressure. Pre-shaped samples were sintered in atmosphere controlled furnace at 580°C for 4 h. Scanning electron microscope, X-ray diffraction examinations and hardness measurements were carried out after standard metallographic processes. Wear tests were performed in a pin on type wear apparatus under 30 N with 1 m s¯¹ sliding speed, at six different sliding distances (500-3000 m). Results show that the hardness was increased with increasing of amount of B₄C. At the end of wear tests the lowest weight loss were found to 9% B₄C containing composites. In addition, it is determined that the weight loss increased with increasing sliding distance.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 565-568
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Surface Polishing on the Flexural Strength of Anorthite-based Porcelainised Stoneware
    Autorzy:
    Yildirim, H.
    Azakli, Y.
    Tarakci, M.
    Capoglu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401371.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.65.Ps
    62.20.mm
    Opis:
    The effect of surface polishing on the flexural strength of anorthite based porcelainised stoneware was studied. The flexural strength results obtained from both polished and unpolished samples were analysed by using Weibull statistical method. The state of surfaces and microstructures of polished and unpolished samples were also characterised by profilometry and scanning electron microscopy. Typical flexural strength value obtained from anorthite based stoneware body fired at 1210°C was about 100 MPa. The average flexural strength (σ_{m}) and Weibull modulus (m) values for as fired, ground, and ground and polished specimens increased sequentially with polishing degree. The surface roughness measurements and microstructure observations showed that the severity of the surface flaws declined as the polishing process proceeded. The obtainment of better strength behaviour with polishing was attributed to high crystalline to glassy phase ratio of the anorthite based porcelainised stoneware together with the formation of network structure of these anorthite crystals.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1336-1341
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-strand conformation polymorphism-based genetic characterization of the Cyclospora cayetanensis strains collected from different provinces in Turkey
    Autorzy:
    Cicek, M.
    Yıldırım, İ.H.
    Cengiz, Z.T.
    Karaman, Ü.
    Powiązania:
    https://bibliotekanauki.pl/articles/28762778.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2021, 28, 2; 267-270
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomological and phytochemical evaluation of different cherry species: mahaleb (Prunus mahaleb L.), wild sweet cherry (Prunus avium L.) and wild sour cherry (Prunus cerasus L.), sweet and sourcherry cultivars
    Autorzy:
    Karaat, F.E.
    Gündüz, K.
    Saraçoğlu, O.
    Yıldırım, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/12663172.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    mahaleb cherry
    Prunus mahaleb
    wild cherry
    sweet cherry
    Prunus avium
    sour cherry
    Prunus cerasus
    fruit species
    fruit cultivar
    fruit tree
    pomological evaluation
    phytochemical evaluation
    antioxidant capacity
    total phenolics content
    Opis:
    Cherries are known as health friendly fruits due to their abundant phytochemical compositions. This study was conducted to determine phytochemical and pomological fruit properties of different cherry species including mahaleb (Prunus mahaleb L.), wild sweet cherry (Prunus avium L.), wild sour cherry (Prunus cerasus L.), two sweet cherries (‘Napoleon’ and ‘Starks Gold’) and one sour cherry (‘Kütahya’) cultivars. For this aim, together with various pomological traits, total phenolics and anthocyanin contents, antioxidant capacity, organic acids, sugars, were analyzed in fruits of relevant genotypes. Results of all examined traits significantly varied between genotypes. Mahaleb showed the highest TSS (30.17%), fructose (8.71 μg/g) and glucose (20.74 μg/g) contents. Wild sour cherry gave the highest antioxidant capacity (13.25 mmol TE/ kg total weight), anthocyanin (351.0 mg Pg-3-glk/kg total weight), citric acid (0.56 μg/g) and malic acid (2.96 μg/g) contents. As a rootstock, mahaleb was found to be superior in some of the traits when compared to wild sweet cherry. Significant correlations were observed between various traits. Additionally, principal component analysis (PCA) revealed different relationships among the traits and evaluated genotypes.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 181-191
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion and tribocorrosion behavior of cast and machine milled Co-Cr alloys for biomedical applications
    Autorzy:
    Mindivan, F.
    Yıldırım, M.
    Bayındır, F.
    Mindivan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1061937.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    82.45.Bb
    87.85.jf
    Opis:
    In this study, the electrochemical behavior and tribocorrosion performance of cobalt-chromium (Co-Cr) alloys produced by different fabrication methods (casting and CAD/CAM milling technique) have been investigated in the laboratory-simulated artificial saliva. The results have shown that the maximum tribocorrosion resistance was obtained for milled Co-Cr alloy because of higher corrosion resistance and hardness of milled Co-Cr alloy compared too those of cast Co-Cr alloy. Moreover, the lowest friction coefficient was achieved for milled Co-Cr alloy.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 701-704
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Antibacterial Properties of Nano $TiO_2$ and ZnO Particle Filled Polymers
    Autorzy:
    Altan, M.
    Yildirim, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293839.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.35.Np
    81.07.-b
    Opis:
    Antibacterial property for the plastic products is very important due to their wide spread usage in many areas close to human health such as a child toy or a food package. There are some methods to make polymers antibacterial such as ionizing radiation but they can be still infected by micro organisms during usage of them. The best and easy way to obtain antibacterial polymers is melt mixing of polymers with antibacterial agents. In this study, nano $TiO_2$ and ZnO particles were mixed with polypropylene and high density polyethylene with a twin screw extruder. Silane was applied to the particles prior melt mixing in order to prevent agglomeration and FT-IR analysis was done to characterize the particles. After melt mixing, particle filled rectangular plates were obtained by plastic injection molding and antibacterial tests were done on the plates according to a standard method, JIS Z 2801. According to the results, satisfactory antibacterial properties were obtained for both polymers and it has been seen that particles without silane could not provide antibacterial effect.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 645-647
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of higher order Hamiltonian approach to nonlinear vibrating systems
    Zastosowanie metody Hamiltona wyższego rzędu w zagadnieniu drgań układów nieliniowych
    Autorzy:
    Askari, H.
    Nia, Z. S.
    Yildirim, A.
    Yazdi, M. K.
    Khan, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/279297.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    higher order Hamiltonian approach
    Duffing equation
    analytical solutions
    Opis:
    The higher order Hamiltonian approach is utilized to elicit approximate solutions for two nonlinear oscillation systems. Frequency-amplitude relationships and the model of buc kling of a column and mass-spring system are scrutinized in this paper. First, second and third approximate solutions of examples are achieved, and the frequency responses of the systems are verified by exact numerical solutions. According to the numerical results, we can conclude that the Hamiltonian approach is an applicable method for solving the nonlinear equations, and the accuracy of this method in the second and third approximates is very high and reliable. The achieved results of this paper demonstrate that this method is powerful and uncomplicated for solving of sophisticated nonlinear problems.
    W pracy przedstawiono zastosowanie metody Hamiltona wyższego rzędu do wyznaczania przybliżonych rozwiązań analitycznych dla dwóch nieliniowych układów drgających. Szczegółowej analizie poddano charakterystyki amplitudowo-częstościowe modelu ściskanej belki oraz dyskretnego układu sprężysto-inercyjnego. Otrzymano przybliżone rozwiązania pierwszego, drugiego i trzeciego rzędu, a odpowiedzi częstościowe układów porównano z dokładnymi rezultatami symulacji numerycznych. Na ich podstawie oceniono, że metoda Hamiltona jest stosowalna dla układów nieliniowych, a przybliżenia drugiego i trzeciego rzędu stanowią rozwiązania analityczne o wysokiej dokładności. Uzyskane w pracy wyniki przekonują, że zaproponowana metoda jest prostym i jednocześnie bardzo skutecznym narzędziem rozwiązywania nieliniowych problemów układów mechanicznych o dużym stopniu złożoności.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 287-296
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimicrobial property and antiproliferative activity of Centaurea babylonica (L.) L. on human carcinomas and cervical cancer cell lines
    Autorzy:
    Guvensen, N.C.
    Keskin, D.
    Gunes, H.
    Oktay, M.K.
    Yildirim, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083066.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Centaura babylonica
    antimicrobial activity
    antiproliferative activity
    A-549
    PC-3
    MCF-7 and HeLa cell lines
    chemical
    composition
    GC-MS
    Opis:
    Introduction and objective. Since antiquity, C. babylonica (L.) L. extracts has been used as a remedy for primary health care in traditional medicine. In this study, a total of seven different crude extracts (acetone, chloroform, hexane, ethylacetate, methanol, ethanol and water) from branches and leaves of C. babylonica (L.) L. were prepared to determine antimicrobial and antiproliferative activity against cancer cell lines. Materials and method. MIC assay was used for antimicrobial activity against gram positive and gram negative bacteria, and one yeast. MTT assay was applied to screen the antiproliferative activity of seven extracts, and to determine dose- and time-dependent effects of the aceton extract on A549, PC-3, MCF-7, and HeLa cell lines. Results. The aceton extract of C.babylonica (L.) L. showed the best antibacterial activity against Bacillus cereus, P. aeruginosa and C. albicans (MIC: 1.6 mg/mL). GC-MS analyses allowed six compounds to be determined; the main constituents of acetone extract from C. babylonica (L.) L. were diacetone alcohol (53.47 %), 1-dexadecene (10.19 %) and 1-tetradecene (8.67 %). In addition, seven different solvent extracts at 500 μg/mL caused antiproliferative activity between 84% – 88%, compared to control. Dose-dependent effects of the extracts on A549 cells indicated that chloroform, ethyl acetate, and aceton extract were the most effective extracts with the IC50 values of 9, 33, and 36 μg/mL, respectively. Conclusions. The results clearly demonstrate that C. babylonica (L.) L. exhibited a strong antimicrobial effect and antiproliferative activity against cancer cells in vitro. Further studies are required to isolate and characterize the active pure compounds responsible for the antimicrobial and antiproliferative activities.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 290-297
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An effective protocol for in vitro germination and seedling development of lentisk (Pistacia lentiscus L.)
    Autorzy:
    Yıldırım, H.
    Çalar, N.
    Onay, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11860763.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    lentisk
    Pistacia lentiscus
    germination
    seed germination
    in vitro germination
    plant propagation
    micropropagation
    seedling development
    genetic transformation
    plant research
    breeding research
    Opis:
    Different nutrient media (MS [Murashige and Skoog 1962]; QL [Quoirin and Lepoivre 1977] and WPM [Lloyd and McCown 1980]); plant growth regulators BA (benzil adenin), GA3 (gibberellic acid), IBA (indole-3-butyric-acid), NAA (naftalen acedic acid); and sucrose concentrations were studied to determine the in vitro culture effects on healthier and faster seedling development from mature lentisk (Pistacia lentiscus L.) seeds. After 28 days of culture, the percentage of germinated seeds was the highest (70%) in the full-strength MS medium. The cytokinin BA was superior to other tested treatments in terms of its ability to promote germination of lentisk seeds. When tested at different concentrations, sucrose gave the best results obtained at concentrations of 1–4%, whereas high concentrations (6 and 8%) mainly decreased germination rate and there was no a regular pattern for elongation of the aerial parts of plants. With this described protocol, on average 76.67% seeds germinated 4 weeks after culture. Developed seedlings were satisfactorily acclimatized in sterilized peat, soil and perlite containing compost, with high percentage survival viability was obtained 9 months after transfer to in vivo conditions (93.33%). The results obtained showed that the enriched full-strength MS medium supplemented with 1 mg L–1 BA and 3% sucrose induced homogeneous and healthy seedling development in a period of 4 to 8 weeks of culture.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 4; 3-13
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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