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    Wyświetlanie 1-6 z 6
    Tytuł:
    Determining Springback Behavior of High-Strength Steels via Channel Forming Process
    Autorzy:
    Esener, E.
    Sönmez, E.
    Özsoy, M.
    Firat, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031636.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Hy
    06.60.Mr
    Opis:
    The increasing use of high-strength steels in sheet metal automotive parts usually brings about the springback problems that can not be easily solved, compared to stamping the parts of conventional steel grades. Prediction and compensation of springback at the design stage is very important from both, the academic and the industrial perspectives. For this purpose, finite element analysis and simulative tests are used to understand formability properties of the material. In this study, springback behaviour of high-strength steels was investigated. Angular channel forming process is used as a simulative test with the DP600, DP1000, and DP1400 materials. Channel forming die tools were designed using a shallowly curved geometry for investigating springback behaviour of materials. Die tools were manufactured and forming process was performed at a hydraulic press machine. Sample surfaces were scanned using optical scanning. Then, experimental springback surfaces were compared with reference geometry by shape deviation analysis. It is observed that springback amount of DP1400 is much greater than those of DP600 and DP800 steels. The DP600 steel has minimum springback amount in the flange region and it has shown the smallest deviation from the reference forming surface, as a result of shape deviation analysis.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1010-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of in vitro methods for regeneration of strawberry ‘Festival’ and ‘Rubygem’ varieties (Fragaria × annanasa Duch.)
    Rozwój metod regeneracji in vitro odmian truskawki 'Festival' i 'Rubygem'
    Autorzy:
    Sönmez, D.A.
    Kafkas, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/11542383.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The cultivated strawberry (Fragaria × ananassa Duch.), a member of the Rosaceae, is the most important soft fruit in the world. In vitro micropropagation is an important tool for clonal multiplication and is commonly applied for induction of somaclonal variation to create genetic variability. Optimized regeneration protocols and high efficiency are also important for gene transformation for improving new cultivars. For this purpose, in this study it was aimed to optimize a regeneration protocol for ‘Festival’ and ‘Rubygem’ strawberry varieties. Leaf disks and stipules from mature in vitro grown strawberry plants of ‘Festival’ and ‘Rubygem’ varieties (Fragaria × annanasa Duch.) were used as explant sources. Mc Cowns Woody plants including vitamins were used as a basal medium. Different concentrations of TDZ (Thidiazuron) (0, 1, 2, 3 and 4 mg l⁻¹) and IBA (Indole-3-butyric acid) (0, 0.2 and 0.4 mg l⁻¹) and the efficiency of 15 days dark treatment on the regeneration from leaf disks and stipules were also tested. Our results suggested that leaf stipules, a high concentration of TDZ, AgNO3 and a dark treatment in culture medium successfully resulted in the induction of regeneration.
    Truskawka uprawna (Fragaria × ananassa Duch.), należąca do rodziny Rosaceae, jest najważniejszym owocem miękkim na świecie. Mikrorozmnażanie in vitro jest ważnym narzędziem do rozmnażania przez klonowanie i jest powszechnie stosowane do wywoływania odmiany somaklonalnej dla wytworzenia zmienności genetycznej. Zoptymalizowane protokoły regeneracji oraz wysoka wydajność również są ważne dla transformacji genów w celu ulepszenia nowych odmian. Dlatego celem niniejszej pracy była optymalizacja protokołu regeneracji dla odmian truskawek ‘Festival’ i ‘Rubygem’. Blaszki liściowe oraz przylistki dojrzałych wyhodowanych in vitro roślin truskawek odmian ‘Festival’ i ‘Rubygem’ (Fragaria × annanasa Duch.) wykorzystano jako źródła eksplantów. Rośliny Mc Cowns Woody zawierające witaminy wykorzystano jako pożywkę zasadową. Przetestowano również różne stężenia TDZ (Tidiazuron) (0, 1, 2, 3 i 4 mg l⁻¹) i IBA (kwas indolowo-3-masłowy) (0, 0,2 i 0,4 mg l⁻¹) oraz wpływ 15-dniowego zaciemnienia na regenerację z blaszek liściowych i przylistków. Nasze wyniki sugerowały, że przylistki, wysokie stężenie TDZ, AgNO3 oraz zaciemnianie w pożywce hodowlanej pozytywnie wpłynęły na wywołanie regeneracji.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2012, 11, 4; 129-142
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment on Gamma Attenuation Behavior of W-VC-C and W-VC-TiC-C Composites for Co-60 Radioisotope
    Autorzy:
    Demir, E.
    Tugrul, A.
    Sonmez, S.
    Ovecoglu, L.
    Buyuk, B.
    Yilmaz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031587.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    attenuation coefficient
    Co-60
    radiation shielding material
    transmission technique
    W-VC-C-TiC composite
    Opis:
    In this study, tungsten-vanadium carbide-graphite (W-VC-C) and tungsten-vanadium carbide-titanium carbide-graphite composite (W-VC-TiC-C) materials were investigated against Co-60 gamma radioisotope. The composite materials which are used in advanced technological studies and high temperature applications in many various fields especially in the areas of fission and fusion armor materials were produced by mechanical alloying method as in two groups. One of them include 93% tungsten (W), 6% vanadium carbide (VC) and 1% graphite (C) also which has three different alloying times (6-12-24 h). Other group of the samples was composed of 91% tungsten, 6% vanadium carbide (VC), 2% titanium carbide (TiC) and 1% graphite (C) also which has three different alloying times (6-12-24 h) and sintered at 1750°C. Co-60 gamma radioisotope source and gamma transmission technique were used in the experiments to investigate the properties of the composite materials. The mass attenuation coefficients of the samples were determined by using experimental results and theoretical mass attenuation coefficients were calculated from XCOM computer code. It can be concluded that increasing the tungsten ratio causes higher mass attenuation coefficient and the composite materials have provided us benefits better than lead for radiation gamma shielding.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 830-832
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Investigation on the Mass Attenuation Coefficients of W-VC-C and W-VC-TiC-C Composites for Gamma Radioisotopes
    Autorzy:
    Tuğrul, A.
    Demir, E.
    Yılmaz, O.
    Sönmez, S.
    Öveçoğlu, M.
    Büyük, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187451.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.20.Dc
    81.05.Mh
    Opis:
    In this study, tungsten-vanadium carbide-graphite and tungsten-vanadium carbide-titanium carbide-graphite composites (W-VC-TiC-C) which can be used in high-tech equipment were investigated against different gamma radioisotopes. The composite materials were produced via mechanical alloying method in two groups; one of them includes 93% tungsten (W), 6% vanadium carbide (VC) and 1% graphite (C) which was synthesized during three different alloying times (6, 12, 24 hours). Other group of the samples were composited as 91% tungsten, 6% vanadium carbide (VC), 2% titanium carbide (TiC) and 1% graphite (C) which has also three different alloying times (6, 12, 24 hours). Gamma transmission technique was used in the experiments to investigate the gamma attenuation properties of the composite materials. Linear and mass attenuation coefficients of the samples were determined in the experiments and theoretical mass attenuation coefficients were calculated using widely acknowledged XCOM computer code. The experimental mass attenuation coefficients and calculated theoretical results were compared and evaluated with each other. Results showed that gamma attenuation coefficients of the composite materials dependent on alloying time. It can be concluded that increasing the tungsten ratio causes higher linear attenuation coefficient which decreases with increasing gamma energies.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 724-727
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Radiation Properties of Tungsten and Additive Metal Coatings on 321 Stainless Steel Substrate
    Autorzy:
    Demir, E.
    Karabas, M.
    Sonmez, S.
    Tugrul, A.
    Ovecoglu, M.
    Buyuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033365.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.20.Dc
    81.05.Mh
    Opis:
    In the present work, the gamma and neutron attenuation behaviors of tungsten, tungsten copper, and tungsten boron-carbide coatings on 321 stainless steel substrate were investigated against Cs-137 and Co-60 gamma radioisotopes and Pu-Be neutron source. The experimental results were compared and evaluated with pure 321 stainless steel to obtain gamma and neutron shielding properties of the coating materials. Tungsten, tungsten copper, and tungsten boron-carbide coatings on 321 stainless steel substrate were fabricated by atmospheric plasma spraying technique. Gamma and neutron transmission technique were used in this study to investigate the radiation behaviors of the coated materials. Linear attenuation coefficients of coated samples were carried out for Pu-Be neutron source. Transmittance values for each specimen were calculated at 0.662 MeV and 1.25 MeV gamma energies. The experimental results were evaluated for radiation shielding properties of the coated samples against gamma and neutron source with pure 321 stainless steel.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 71-73
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of luteolin on spermatological parameters, apoptosis, oxidative stress rate in freezing rabbit semen
    Autorzy:
    Akarsu, S.A.
    Acısu, T.C.
    Güngör, İ.H.
    Çakır Cihangiroğlu, A.
    Koca, R.H.
    Türk, G.
    Sönmez, M.
    Gür, S.
    Fırat, F.
    Esmer Duruel, H.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647483.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    rabbit
    semen
    cryopreservation
    luteolin
    oxidative stress
    apoptosis
    Opis:
    The aim of the present study was to determine the effects of Luteolin (LUT) on semen quality, oxidative stress, apoptosis, acrosomal integrity, mitochondrial membrane potential and dead sperm ratio in rabbits. Ejaculates from six New Zealand rabbits were collected, evaluated and pooled. The pooling was divided into five groups as control (no additive) LUT 25 μM, LUT 50 μM, LUT 100 μM and LUT 200 μM and LUT added. It was then filled into a falcon tube with Tris-based extender at a final concentration of approximately 35 x 106 spermatozoa. Diluated rabbit semen samples were drawn into frozen and thawed. Frozen semen straws were thawed at 37°C in 30 seconds. According to our findings, no statistical difference was found between all doses of luteolin and the control group in the CASA (computer assisted sperm analysis) analysis performed at 4°C. However, total motility, progressive motility and rapid sperm percentage were found to be higher in the frozen and thawed rabbit semen at a dose of LUT 50 μM compared to the other groups (p<0.05). While amplitude of lateral head displacement (ALH) and beat cross-frequency (BCF) values were found at the lowest dose of LUT 200 μM, a statistically significant difference was observed between the other groups. When the flow cytometry results were examined, no statistical difference was found between the rate of dead sperm, acrosomal integrity, mitochondrial membrane potential and apoptosis rate. Morever, the H2O2 percentage was found to be lower in all experimental groups compared to the control group (p<0.001). In conclusion, the addition of LUT in long-term storage of rabbit semen provided a protective effect for spermatozoa with its antioxidative properties against damage caused by cryopreservation.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 91-98
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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