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    Wyświetlanie 1-15 z 15
    Tytuł:
    Characterization of class 1, 2, 3 integrons, ESBL genes and antibiotic susceptibility of Salmonella serotypes from broiler and cattles in Turkey
    Autorzy:
    Sahan Yapicier, O.
    Ozturk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539245.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    antibiotic susceptibility
    broiler
    cattle
    integrons
    β-lactamase
    MARI
    Salmonella
    tet genes
    Opis:
    Antimicrobial resistance in Salmonella has been associated with the presence of integrons and many other resistance mechanisms contributing to the spread of antimicrobial-resistant genes within and between livestock and human populations. In this study, the presence of Salmonella serovars from broiler and cattle samples and their antimicrobial resistance, integrons, tet resistance, ESBL and resistance genes carriage were investigated. Total of 209 litter (broiler farms) and fecal samples (cattle farms) were examined by bacteriological procedures, susceptibilities against 18 antimicrobials and genes carriages were detected by singleplex and multiplex PCR. A total of 46/209 (22 %) Salmonella strains were isolated. Six different Salmonella serotypes from 46 Salmonella isolates were identified and the most common serotype was S. Infantis 38 (82.6%) from broiler litter; followed by S. Kitenge 3 (6.5 %) from fecal sample. The highest occurrence of resistance observed for penicilline (46/46, %100), lincomycin (43/46, 93.5%) and 42 isolates (43/46, 93.5%) exhibited MDR. The overall occurrence of class 1, 2 and 3 integrons carrying Salmonella in tested samples were 63.04% (29/46), 43.5% (20/46) and 84.8% (39/46) respectively. Out of the 27 isolates produced an ESBL, mostly CTX and TEM. On 46 Salmonella isolates, in 16 (34.8%) Tcr’ genes were determined. Genotypic and phenotipic detection of ESBL genes found within integrons from Salmonella isolates from different sources (broiler and cattle) can provide powerful information about health and economic risk associated with transferable multidrug resistance.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 2; 345-355
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the quality characteristics of naturally growing hawthorn in Susehri
    Autorzy:
    Ağlar, E.
    Sümbül, A.
    Karakaya, O.
    Ozturk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/12707027.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The study was conducted in 2017 in the district of Sivas. In the study, 20 genotypes, which are considered to be different from each other, taking into account the fruit characteristics such as color and size and shape, were determined from the hawthorns that were naturally grown in the flora of Suşheri. At harvest time, the fruit, which would be adequate for pomological and biochemical measurements and analyzes, was harvested. According to the results of the measurements and analyzes in the study, fruit weight was found to vary between 0.68 g and 6.35 g, fruit width was between 10.52 and 29.48 mm and fruit length was between 11.40 and 20.67 mm. The highest firmness values were recorded with the genotype (G) 20 genotype, while the G4 had the lowest values in terms of the firmness values of the fruit flesh. While there are no significant differences between the pH values of the genotypes, the differences between the genotypes in terms of SSC, TA and vitamin C contents are quite significant. It has been found that there are significant differences between the genotypes in terms of total phenolic, total flavonoid and antioxidant activity. The total phenolic content ranged from 218.8 (G17) to 605.8 (G5 and G8) mg GAE kg⁻¹ f.w., while the lowest total flavonoid content was 21.58 (G 17) and the highest total flavonoid content was 67.75 (G9) mg GAE kg⁻¹ f.w. When the antioxidant activity was evaluated, the DPPH values were 1.08 (G17) – 15.43 (14) mmol TE kg⁻¹ f.w., the FRAP values were 15.43 (G16) – 47.23 (G8) mmol TE kg⁻¹ f.w. respectively.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 61-70
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining of the fruit characteristics of pistachio grafted on wild Pistacia terebinthus L. under the Central Kelkit Basin (Turkey) ecological conditions
    Autorzy:
    Ağlar, E.
    Sümbül, A.
    Karakaya, O.
    Ozturk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/12988365.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 6; 91-99
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatty acids and physiological responses of corn leaves exposed to heavy metals
    Autorzy:
    Kisa, D.
    Öztürk, L.
    Sağlam, N.
    Kayir, Ö.
    Elmastaş, M.
    Döker, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/12715010.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Heavy metals affect biochemical pathway by changing the fatty acid composition in plant cells. The high concentration of heavy metals impresses biochemical pathway and changes fatty acid compositions of plant cells. Fatty acids participate in various biological processes and have the functional role in regulating membrane functions in plants. In the present study, heavy metal content was analyzed with ICP-MS, fatty acid composition was investigated with GC and physiological parameters were determined with spectrophotometrically in the leaves of tomato subjected to increasing doses of heavy metals. In this study, the treatment of heavy metals on the growth medium changed the fatty acid contents of corn. The application of Cu significantly increased the level of palmitic acid and oleic acid. The treatment of Pb raised the content of oleic acid, whereas it significantly decreased the content of α-linolenic acid and erucic acid at 20 and 50 mg kg⁻¹, respectively. The addition of Cd significantly increased the level of oleic acid and linoleic acid; however, it significantly decreased the content of α-linolenic acid and erucic acid. Cu and Pb significantly raised the proline content. The application of Cu and Cd showed similar effect on hydrogen peroxide and the higher doses of them increased the content of H₂O₂. The level of lipid peroxidation significantly increased in response to all applied concentration of Cu. The results obtained in this study show that the aapplication of heavy metals changed the content of fatty acids, particularly that of oleic acid significantly increased in response to them. The levels of proline and lipid peroxidation generally increased together with oleic acid and palmitic acid in the leaves in reply to copper.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 3; 3-14
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aminoethoxyvinylglycine and foliar zinc treatments play a key role in pre-harvest drops and fruit quality attributes of 'William's Pride' apple
    Autorzy:
    Ozturk, B.
    Yıldız, K.
    Erdem, H.
    Karakaya, O.
    Ozturk, A.
    Aglar, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/12303649.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    apple tree
    William's Pride cultivar
    apple cultivar
    foliar treatment
    pre-harvest application
    zinc application
    aminoethoxyvinylglycine
    Opis:
    Productivity of plants is determined by multiple factors that directly affect one another, therefore yield variability may be high and difficult to predict. Most often, however, a lower crop yield is achieved in the notillage system than in the ploughing system. An exact field experiment was undertaken to determine the yield and chemical composition of pea seeds sown under conditions of: 1) conventional tillage – CT (shallow ploughing and harrowing after the harvest of previous crop, pre-winter ploughing in winter); 2) reduced tillage – RT (stubble cultivator after the harvest of previous crop); and 3) herbicide tillage – HT (only glyphosate after the harvest of previous crop). A cultivation unit was applied on all plots in the springtime. Pea seed yield was higher by 14.1% in the CT than in the RT system and by 50.5% than in the HT system. The CT system was increasing the plant number m–2, number of pods and seeds m–2, seed mass per plant, and 1000 seeds mass, compared to the other systems. Protein content of seeds was at a similar level in all analyzed tillage systems, but was affected by the study year. In turn, the mineral composition of seeds was determined by both tillage system and study year. The seeds harvested from CT plots contained more phosphorus and iron, those from RT plots – more calcium and zinc, whereas those from HT plots – more phytate-P, potassium, magnesium, and copper, compared to the seeds from the other plots.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 2; 147-158
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined treatments of modified atmosphere packaging with aminoethoxyvinylglycine maintained fruit quality in sweet cherry throughout cold storage and shelf life
    Autorzy:
    Guler, S.K.
    Karakaya, O.
    Karakaya, M.
    Ozturk, B.
    Aglar, E.
    Yarılgac, T.
    Gün, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/12613537.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    wild cherry
    Prunus avium
    fruit quality
    fruit firmness
    fruit colour
    fruit storage
    weight loss
    shelf life
    packaging
    modified atmosphere
    aminoethoxyvinylglycine
    phenolic compound
    total phenol content
    Opis:
    The effects of combined aminoethoxyvinylglycine (AVG) and modified atmosphere packaging (MAP) treatments on quality attributes of ‘0900 Ziraat’ sweet cherry fruit during the cold storage and shelf life were investigated in this study. Significantly lower weight loss and decay ratios were observed in all treatments throughout the cold storage period as compared to the control. A similar case was also observed referring to the shelf life. MAP treatments were found to be more effective in retarding the weight loss and decay ratio. Higher hue angle values were measured from AVG-treated fruit at harvest. Similarly, hue angle of AVG and MAP-treated fruit were also higher than for the control in all periods of cold storage and on the 7th and 21st day of shelf life. AVG-treated fruit had higher firmness values than the control at harvest. However, higher firmness values were measured from MAP-treated fruit during the cold storage and shelf life. At the end of cold storage, lower SSC and higher titratable acidity values were observed in AVG and MAP-treated fruit than in the control. AVG + MAP treatments yielded significantly higher vitamin C, total phenolics and antioxidant activity values than the control. Contrarily, the control fruit had significantly higher total monomeric anthocyanin than the other treatments. Based on current findings, it was concluded that combined AVG + MAP treatments could be used as a beneficial tool to maintain the quality of sweet cherry fruit throughout the cold storage and shelf life.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 13-26
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Neural Network System for Prediction of Dimensional Properties of Cloth in Garment Manufacturing: Case Study on a T-Shirt
    Zastosowanie sztucznego systemu sieci neuronowych do prognozowania wymiarów w produkcji odzieży: studium przypadku na koszulce
    Autorzy:
    Kalkanci, M.
    Kurumer, G.
    Öztürk, H.
    Sinecen, M.
    Kayacan, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/234435.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    cloth dimensional change
    knitted fabric
    relaxation
    artificial neural networks
    wymiary odzieży
    trykot
    system sieci neuronowch
    Opis:
    The purpose of the present study was to estimate dimensional measure properties of T-shirts made up of single jersey and interlock fabrics through artificial neural networks (ANN). To that end, 72 different types of T-shirts were manufactured under 2 different fabric groups, each was consisting of 2 groups: one with elastane and the other without. Each of these groups were manufactured from six different materials in three different densities through two different knitting techniques of single jersey and interlock. For estimation of dimensional changes in these T-shirts, models including feed-forward, back-propagated, the momentum learning rule and sigmoid transfer function were utilized. As a result of the present study, the ANN system was found to be successful in estimation of pattern measures of garments. The prediction of dimensional properties produced by the neural network model proved to be highly reliable (R2> 0.99).
    Celem pracy było oszacowanie wymiarów koszulek przy użyciu sztucznego systemu sieci neuronowych (ANN). W tym celu wyprodukowano 72 różne typy koszulek. Koszulki wyprodukowano z sześciu różnych materiałów o trzech różnych gęstościach za pomocą dwóch różnych technik dziewiarskich. W celu oszacowania zmian wymiarów koszulek wykorzystano modele oparte na sprzężeniu zwrotnym, propagowaniu wstecznym, regule uczenia się impulsów i funkcji przenoszenia sigmoidów. Na podstawie wyników badań stwierdzono, że system ANN okazał się skuteczny w szacowaniu wymiarów odzieży. Przewidywanie wymiarów uzyskanych przy wykorzystaniu modelu sieci neuronowych okazało się bardzo wiarygodne (R2> 0,99).
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 4 (124); 135-140
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Cu/Ag/Eu/Hydroxyapatite Composites Produced by Wet Chemical Precipitation
    Autorzy:
    Komur, B.
    Ozturk, E.
    Ekren, N.
    Inan, A.
    Gunduz, O.
    Andronescu, E.
    Ficai, A.
    Oktar, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033469.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.05.Mh
    87.85.J
    Opis:
    In the first part of this study hydroxyapatite was prepared synthetically through classical wet precipitation, using Ca(NO₃)₂·4H₂O (calcium nitrate tetrahydrate) as calcium source and HgN₂O4P as phosphate source. In the second part of the study HA compounds were prepared with different ratios (0.5, 1, 2, 5, 10 and 25 wt.%) of antibacterial materials like copper (Cu), silver (Ag) and europium (Eu), using the same wet precipitation method. The prepared pure HA material was utilized as the control group for comparison with Cu/Ag/Eu/HA composites. Studies of X-ray diffraction, FTIR spectroscopy, scanning electron microscopy, equipped with energy dispersive X-ray analysis were performed. The aim of this study was to investigate Cu/Ag/Eu/HA composites and the effect of metals on HA biomaterials, used as scaffold materials in bone disease treatment.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 392-396
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of driver sleepiness and warning the driver in real-time using image processing and machine learning techniques
    Autorzy:
    Umut, I.
    Aki, O.
    Uçar, E.
    Öztürk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/102474.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    driver
    sleepiness
    real time
    image processing
    machine learning
    Opis:
    The aim of this study is to design and implement a system that detect driver sleepiness and warn driver in real-time using image processing and machine learning techniques.Viola-Jones detector was used for segmenting face and eye images from the camera-acquired driver video. Left and right eye images were combined into a single image. Thus, an image was obtained in minimum dimensions containing both eyes. Features of these images were extracted by using Gabor filters. These features were used to classifying images for open and closed eyes. Five machine learning algorithms were evaluated with four volunteer’s eye image data set obtained from driving simulator. Nearest neighbor IBk algorithm has highest accuracy by 94.76% while J48 decision tree algorithm has fastest classification speed with 91.98% accuracy. J48 decision tree algorithm was recommended for real time running. PERCLOS the ratio of number of closed eyes in one minute period and CLOSDUR the duration of closed eyes were calculated. The driver is warned with the first level alarm when the PERCLOS value is 0.15 or above, and with second level alarm when it is 0.3 or above. In addition, when it is detected that the eyes remain closed for two seconds, the driver is also warned by the second level alarm regardless of the PERCLOS value. Designed and developed real-time application can able to detect driver sleepiness with 24 FPS image processing speed and 90% real time classification accuracy. Driver sleepiness were able to detect and driver was warned successfully in real time when sleepiness level of driver is achieved the defined threshold values.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 95-102
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On nonoscillatory solutions of two dimensional nonlinear delay dynamical systems
    Autorzy:
    Ozturk, O.
    Akin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/254865.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    time scales
    oscillation
    two-dimensional dynamical system
    Opis:
    We study the classification schemes for nonoscillatory solutions of a class of nonlinear two dimensional systems of first order delay dynamic equations on time scales. Necessary and sufficient conditions are also given in order to show the existence and nonexis-tence of such solutions and some of our results are new for the discrete case. Examples will be given to illustrate some of our results.
    Źródło:
    Opuscula Mathematica; 2016, 36, 5; 651-669
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of cold storage on the bioactive components and physical properties of caucasian whortleberry (Vaccinium arctostaphylos l.). a preliminary study
    Wpływ przechowywania w chłodni na bioaktywne składniki i właściwości fizyczne borówki kaukaskiej (Vaccinium arctostaphylos l.) badanie wstępne
    Autorzy:
    Ozturk, B.
    Karakaya, O.
    Celik, S.M.
    Karakaya, M.
    Guler, S.K.
    Yarilgac, T.
    Aydin, H.
    Ozturk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543339.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    In this study, antioxidant activity (AA), total phenolics (TP), total flavonoids (TF), individual phenolic compounds (IPCs), vitamin C and six other fruit characteristics including weight loss, flesh firmness, color, soluble solids content (SSC), dry matter and titratable acidity (TA) of Caucasian whortleberry fruits (Vaccinium arctostaphylos L.) were determined at harvest and at a week postharvest intervals throughout the cold storage at 0°C for 4 weeks. Significant decreases were observed in fruit weight and flesh firmness during the cold storage period. While L* and chroma values decreased significantly, an increase was observed in hue angle values. Significant increases were observed in dry matter, but decreases were observed in SSC, TA and vitamin C contents. Caucasian whortleberry fruits had quite high polyphenol contents. Total phenolics (TP), total flavonoids (TF), antioxidant activity (AA) (according to ABTS+, DPPH· and FRAP antioxidant tests) and individual phenolic compounds (IPCs) significantly decreased throughout the cold storage. Chlorogenic acid was the major phenolic in Caucasian whortleberry fruits. It was concluded that Caucasian whortleberry fruits with high phenolic compound and flavonoid levels might serve a potential antioxidant source.
    Zbadano aktywność antyoksydacyjną (AA), całkowitą zawartość fenoli (TP), flawonoidów (TF), indywidualnych związków fenolowych (IPC), witaminy C oraz sześć innych cech, takich jak utrata wagi, zwartość miąższu, barwa, zawartość rozpuszczalnych substancji stałych (SSC), sucha masa oraz kwasowość (TA) owoców borówki kaukaskiej (Vaccinium arctostaphylos L.) podczas zbioru oraz z tygodniowymi przerwami po zbiorach w czasie całego okresu przechowywania w chłodni w temperaturze 0°C przez 4 tygodnie. Zaobserwowano istotny spadek masy owoców i zwartości miąższu podczas okresu przechowywania w chłodni. Wartości barwy zmniejszyły się istotnie, natomiast zaobserwowano wzrost wartości kąta odcienia. Zaobserwowano istotny wzrost suchej masy, ale spadek został zanotowany w zawartości SSC, TA oraz witaminy C. Owoce borówki kaukaskiej miały dość wysoką zawartość polifenoli. Całkowita zawartość fenoli (TP), flawonoidów (TF), aktywność antyoksydacyjna (AA) (według testów antyoksydacyjnych ABTS+, DPPH· i FRAP) oraz indywidualne związki fenolowe (IPC) istotnie zmniejszyły się w okresie przechowywania w chłodni. Kwas chlorogenowy był głównym fenolem w owocach borówki kaukaskiej. Wyciągnięto wniosek, że owoce borówki kaukaskiej o wysokim poziomie związków fenolowych i flawonoidów mogą służyć za potencjalne źródło antyoksydantów.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 2; 77-93
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manipulation of Exchange Coupling in Py/Co/Cr Multilayer Thin Films
    Autorzy:
    Aköz, M.
    Parlak, U.
    Şahin, Y.
    Tavşan, D.
    Tarcan, E.
    Öztürk, O.
    Tokdemir Öztürk, S.
    Erkovan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401229.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    75.50.Cc
    76.50.+g
    Opis:
    The main issue addressed in present study is exchange coupling modification between ferromagnetic layers through non-magnetic spacer layers using extra ultra-thin ferromagnetic layers (Co). In order to achieve this goal, we prepared Cr(50 Å) / Py(20 Å) / Co(5 Å) / Cr(7, 10, 13 Å) / Co(5 Å) / Py (30 Å) / Cr(50Å) / Si using magnetron sputtering at UHV conditions and characterized by Ferromagnetic Resonance (FMR) technique. As the present study results were compared to our previous study on (Py/Cr), the exchange coupling energy was increased ten times with the cobalt thin layer
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 992-994
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe₁₂O₁₉ Phase and Magnetic Properties of Ba-Hexaferrite Magnet
    Autorzy:
    Sadullahoğlu, G.
    Ertuğ, B.
    Gökçe, H.
    Altuncevahir, B.
    Öztürk, M.
    Topkaya, R.
    Akdoğan, N.
    Öveçoğlu, M.
    Addemir, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401897.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Vv
    75.60.Ej
    Opis:
    Barium hexaferrite samples were prepared by mechanical alloying using the stoichiometric amounts of BaCO₃ and Fe₂O₃ precursors followed by heat treatment applied in the temperature range 700-1150°C. It was found that the high energy ball mill with a milling rate enabled to obtain powders with the finer particles at the reduced milling time mechanical alloying of the initial powders linked to the formation of barium hexaferrite phase. The exothermic reaction peaks corresponding to the formation of BaFe₁₂O₁₉ phase shift from 928°C to 793°C for the increased milling time up to 6 h. This was resulted in improved magnetic properties that the Mₛ value of the as-blended sample sintered at 800°C rised from 31.16 emu/g to 53.46 emu/g after milling for 6 h. The saturation magnetization and remanence values of the samples mechanically alloyed for 3 h and sintered at 1150°C also increased to 63.57 emu/g and 31.26 emu/g, respectively, more than for 800°C and 900°C. The increase in the annealing temperature favours the formation of BaFe₁₂O₁₉ phase in the samples.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 377-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FMR Study of Co/Ti Bilayer Thin Films
    Autorzy:
    Erkovan, M.
    Tokdemir Öztürk, S.
    Taşkın Gazioğlu, D.
    Topkaya, R.
    Öztürk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312088.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Cn
    75.50.Cc
    76.50.+g
    Opis:
    We focused on the interaction between two ferromagnetic cobalt layers through a non-magnetic titanium layer. The magnetic properties of the structure were characterized by ferromagnetic resonance technique. The data were collected as a function of non-magnetic titanium layer thickness. Co/Ti multilayer (Ti(50 Å)/Co(45 Å)/Ti(2-40 Å)/Co(40 Å)/Ti(100 Å)) films were grown onto naturally oxidized p-type single crystal Si (100) substrate at UHV condition with magnetron sputtering system at room temperature. The thickness of Ti spacer layer ranges from 2 to 40 Å with 2 Å steps. We did not observe usual optic and acoustic modes; instead we had two broad overlapped peaks for the films ranged from 6 Å to 40 Å. One interesting result was the high anisotropic resonance field values for these films. Exchange coupling between ferromagnetic layers causes shift on resonance field values but these shifts in our samples were much larger than expected. This large anisotropic behavior is not clear at the moment. Our theoretical model was not able to determine a value for the exchange coupling parameter. One reason can be the close thickness values for Co sublayers. The other reason can be the Ti non-magnetic layer. If titanium did not grow layer by layer on cobalt, the cobalt ferromagnetic layers may behave as a single layer. As a result one cannot observe exchange interaction between ferromagnetic layers through non-magnetic spacer.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 673-676
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical properties of hazelnuts
    Autorzy:
    Ercisli, S.
    Ozturk, I.
    Kara, M.
    Kalkan, F.
    Seker, H.
    Duyar, O.
    Erturk, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/25559.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    physical property
    hazelnut
    mechanical property
    nut
    kernel
    genotype
    plant cultivar
    Corylus avellana
    orchard
    Turkey
    Źródło:
    International Agrophysics; 2011, 25, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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