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Wyszukujesz frazę "Özer, M." wg kryterium: Autor


Tytuł:
Chemical composition and antioxidant activity of foxtail lily (Eremurus spectabilis)
Skład chemiczny i działanie przeciwutleniające pustynnika okazałego (Eremurus spectabilis)
Autorzy:
Tosun, M.
Ercisli, S.
Ozer, H.
Turan, M.
Polat, T.
Ozturk, E.
Padem, H.
Kilicgun, H.
Powiązania:
https://bibliotekanauki.pl/articles/11542331.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Eremurus spectabilis is used as a vegetable in Turkey, especially in Eastern Anatolia region. In this study, eight E. spectabilis from different growing areas have been analyzed for its nutrition value and antioxidant properties. The results showed that there were significant differences among samples in terms of all above parameters. The mean values of the parameters investigated were 86.62–91.35% for water content, 4.78–5.15 for pH; 0.42–0.70% for acidity, and 0.61–1.11% for ash content. The antioxidant activity tests evaluated by using 2-diphenyl-1-picryhydrazyl (DPPH) free radical scavenging and β-carotene/linoleic acid assays indicated that the extracts of E. spectabilis samples had high antioxidant capacity. In the DPPH and β-carotene/linoleic acid systems, average values were 73.69 ȝg extract . ml⁻¹ and 94.56%, respectively. The average amount of total phenolics in samples was 223 mg GAE . 100 g⁻¹ FW. Protein, K, Ca, Mg, Fe and Cu contents of E. spectabilis species were found higher than in some other commonly used vegetables. The results suggest that E. spectabilis could be a valuable source of antioxidants, phenolics and minerals.
Eremurus spectabilis używany jest w Turcji jako warzywo, zwłaszcza w regionie Wschodniej Anatolii. W niniejszej pracy przeanalizowano wartość odżywczą i właściwości przeciwutleniających ośmiu roślin E. spectabilis z różnych obszarów uprawowych. Wyniki wykazały, że pomiędzy próbkami wystąpiły znaczące różnice we wszystkich powyższych parametrach. Średnie wartości badanych parametrów wynosiły: 86,62–91,35% dla zawartości wody, 4,78–5,15 dla pH; 0,42–0,70% dla kwasowości oraz 0,61–1,11% dla zawartości popiołu. Badania właściwości przeciwutleniających z wykorzystaniem strącania oczyszczającego wolnych rodników 2-difenylo-1-pikryhydrazylem (DPPH) oraz próby z β-karotenem/kwasem linoleinowym wykazały, że wyciągi z E. spectabilis mają silne zdolności przeciwutleniające. W systemach DPPH i β-karotenowych/z kwasem linoleinowym wartości średnie wynosiły odpowiednio 73.69 ȝg wyciągu. ml⁻¹ i 94,56%. Średnia ogólna zawartość fenoli w próbkach wynosiła 223 mg GAE . 100 g⁻¹ św.m. Stwierdzono, że zawartość białka, K, Ca, Mg, Fe i Cu w roślinach gatunku E. spectabilis jest wyższa niż w innych powszechnie wykorzystywanych warzywach. Wyniki sugerują, że E. spectabilis może być cennym źródłem przeciwutleniaczy, fenoli i związków mineralnych.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2012, 11, 3; 145-153
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Alkali Metallization on the Luminescence Degradation of Porous Silicon
Autorzy:
Kayahan, E.
Özer, M.
Oral, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491506.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Ap
78.55.Mb
Opis:
In this study, change in the intensity and stability of photoluminescence obtained by porous silicon were investigated with illumination time and metallization state. The porous silicon samples were metallized by immersing into solutions containing 3 mM $LiNO_3,$ $KNO_3$ and $NaNO_3$ metal salts using immersing plating method. The surface bond configurations of porous silicon were monitored by the Fourier transmission infrared spectroscopy and the results showed that the surfaces of the samples were oxidized after the metallization. The photoluminescence intensity increased after certain critical immersion times and photoluminescence spectrum shifted towards the high energy region after the metallization. Photoluminescence intensity of metallized porous silicon samples was more stable than as-anodized porous silicon samples. The experimental results suggested the possibility that oxygen and/or alkali metal (Li, K and Na) passivation of porous silicon surface could be a suitable way to obtain an efficient and stabilized photoluminescence.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 281-283
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintering Behaviour of ZnO:Cu Ceramics Fabricated by Sol-Gel Derived Powders
Autorzy:
Bahşi, Z.
Oral, A.
Aslan, M.
Kayahan, E.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1491465.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
Opis:
Doped zinc(II) oxide (ZnO:Cu) ceramics were prepared from sol-gel derived nanocrystalline powders. Powders were prepared by dissolving zinc and copper acetates in isopropyl alcohol. Ethanolamine was used to enhance the solubility of acetates. Powders were produced by the calcination of the dried gels at 750°C. The crystal size of the undoped powders were uniform and around 50 nm while grain size of Cu doped powders varied between 0.3 and 2 μm. X-ray mapping of the powders showed that Cu was not homogeneously distributed and some particles had higher Cu content. After pressing of the powders, both doped and undoped ceramics were sintered at 1200C for 2 h. Microstructure of the Cu doped ceramics showed that Cu atoms partially dissolved in ZnO matrix and the rest formed a second phase in the grain boundaries. Average grain size of the ZnO:Cu ceramics was around 30 μm. Relative densities of the ceramics increased from 0.695 to 0.857 by Cu doping.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 271-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Concept of Unidirectionally Coupled Nonlinear Circuits via a Memristor
Autorzy:
Volos, Ch.
Kyprianidis, I.
Stouboulos, I.
Stavrinides, S.
Anagnostopoulos, A.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1491463.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Xt
Opis:
Confirmation of the existence of memristor by researchers at 2008 attracts much interest on this newly found circuit element. This is due to the fact that memristor opens up new functionalities in electronics and it has led to the interpretation of phenomena regarding not only electronics but also biological systems. In this work, we have studied the simulated dynamic behavior of two unidirectionally coupled nonlinear circuits via a memristor. This confirms the transition from chaotic desynchronization to complete chaotic synchronization through a regime of intermittent synchronization between the unidirectionally coupled circuits.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 268-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Differential Cross-Section Measurements for Electron Impact Ionization of Helium
Autorzy:
Özer, Z.
Olgaç, F.
Ulu, M.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399891.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
The single ionizing collision with an incident electron and atom/molecules ends up two kinds of outgoing electrons called scattering and ejected electrons. As a feature of electron impact ionization these two electrons are indistinguishable. Double differential cross-sections can be obtained by the measurements of energy and angular distributions of one of the two outgoing electrons by a detector. In this perspective, we used He target that is reasonable to expect to understand ionization mechanisms of atomic systems. We have measured double differential cross-sections for asymmetric geometry for different kinematical situations. The experiments are carried out on a newly developed electron spectrometer constructed in Afyonkarahisar, Turkey.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 361-362
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observing Quantum Level Interference Effects with Electron Spectrometer
Autorzy:
Özer, Z.
Ulu, M.
Aktaş, B.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399893.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
34.50.Gb
Opis:
The existence of Young-type interference patterns has been recently searched in triple differential cross-sections for single ionization of $H_2$ molecules by electron impact, and theoretically supported by calculations obtained by different models. The appearance of interference effects arising from the two-centre geometry of diatomic molecule. These effects seen in triple differential cross-sections are described by interference factor in analogy with light waves. In this work, we discuss about that the interference factor for molecular structure of $H_2$ may reproduce Young-type interference patterns depending on scattering angle, initial and ejected electron energies in triple differential cross-sections. Differences are expected in the triple differential cross-sections spectra of ejected electrons according to kinematical conditions imposed by scattering angle and electron energy.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 363-364
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
B-Spline Solution and the Chaotic Dynamics of Troeschs Problem
Autorzy:
Caglar, H.
Caglar, N.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1291812.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Pq
02.60.-x
02.60.Lj
Opis:
A B-spline method is presented for solving the Troesch problem. The numerical approximations to the solution are calculated and then their behavior is studied and commenced. The chaotic dynamics exhibited by the solutions of Troesch's problem as they were derived by the decomposition method approximation are examined and an approximate critical value for the parameter λ is introduced also in this study. For the parameter value slightly less than λ ≈ 2.2, the solutions begin to show successive bifurcations, finally entering chaotic regimes at higher λ values. The effectiveness and accuracy of the B-spline method is verified for different values of the parameter, below its critical value, where the first bifurcation occurs.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 554-559
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
B-Spline Solution for a Convection-Diffusion Equation
Autorzy:
Caglar, H.
Caglar, N.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194831.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.-x
02.60.Lj
Opis:
This paper is concerned with the numerical solution of the convection diffusion problems. A family of B-spline methods has been considered for the numerical solution of the problems. The results showed that the present method is an applicable technique and approximates the exact solution.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 548-550
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Differential Cross-Section Measurements for Methane Molecule at 350 eV
Autorzy:
Yavuz, M.
Isik, N.
Ozer, Z.
Ulu, M.
Doğan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194671.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
Double differential cross-sections have been measured after ionizing electron collisions with methane at primary energy of 350 eV using a conventional electron spectrometer. An electrostatic analyzer was used to measure angular distributions of secondary electrons with energies between 25 eV and 300 eV. Angles of emission were 25° to 130°. It was found that the outgoing electrons belong to one of the two energetically separated groups, either the fast electrons which are scattered mainly in forward direction or the slow electrons which are distributed isotropically into all angles. For higher ejection energies the maxima shifted towards smaller angles as expected from binary type collision.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 442-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Double Differential Cross-Section for Electron Impact Ionization of Argon at 348 eV
Autorzy:
Bozkurt, G.
Yavuz, M.
Ozer, Z.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1195074.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
In this study, we report the angular distribution of double differential cross sections of ejected electrons from Ar in intermediate energy region. Double differential cross-sections for electron impact ionization of argon have been measured at 348 eV. A hemispherical energy analyzer is used to analyze the ejected electrons with energies between 25 and 325 eV and angles between 25° and 130°.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 343-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Double Differential Cross-Sections for He at Intermediate Energy
Autorzy:
Ozer, Z.
Olgac, F.
Ulu, M.
Aktas, B.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194824.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Dp
Opis:
Detailed studies on ionization of atoms and molecules by electron impact have made numerous contributions to understanding of the structure of atoms and molecules including the interaction between particles. After a ionizing collision a scattered electron, an ejected electron and a recoil ion is formed. Doubly differential cross-sections give detailed information for one of the outgoing electrons. In this study, we report the angular distribution of double differential cross-sections of ejected electrons from He in intermediate energy region.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 341-342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Numerical Solution of Fractional Diffusion Equation by Using Local Polynomial Regression
Autorzy:
Caglar, H.
Caglar, N.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194848.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.-x
02.60.Lj
Opis:
In this paper, we apply the local polynomial regression for the solution of the one-dimensional fractional diffusion equation. The Caputo fractional derivative is used for the formulation. A numerical example is given to show the application of the present method. The effect of the fractional order (α) of the equation is illustrated by changing α from 1.01 to 1.99.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 551-553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upper Campanian calciclastic turbidite sequences from the Hacımehmet area (eastern Pontides, NE Turkey): integrated biostratigraphy and microfacies analysis
Autorzy:
Sari, B.
Kandemır, R.
Özer, S.
Walaszczyk, I.
Görmüş, M.
Demırcan, H.
Yilmaz, C.
Powiązania:
https://bibliotekanauki.pl/articles/138655.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Late Campanian
Calciclastic Turbidite
biostratigraphy
Eastern Pontides
kampan
biostratygrafia
Turcja
Opis:
The upper Campanian (Cretaceous) of the Hacımehmet area (south of the city of Trabzon; Eastern Pontides) is mainly composed of calciclastic turbidites. The basinal unit of the 119 m thick succession includes thin red pelagic limestone interlayers and conglomerates dominated by volcanic clasts. The overlying upper slope and lower slope units of the sequence consist of an alternation of allochthonous calcarenite/calcirudite beds and pelagic marls and mudstones. Calcarenite/calcirudite beds dominate the upper slope unit of the succession and are composed of transported material, including benthic foraminifers, red algae, bryozoan, crinoid and rudist fragments, inoceramid bivalve prisms and neritic and pelagic carbonate lithoclasts. The occurrence of Helicorbitoides boluensis (Sirel) extracted from the calcarenite/calcirudite beds indicates a Campanian age. Identifiable rudists such as Joufia reticulata Boehm, Bournonia cf. anatolica Özer, Biradiolites cf. bulgaricus Pamouktchiev and ?Biradiolites sp. from the upper slope unit of the succession indicate a late Campanian–Maastrichtian age. The planktonic foraminifers within the red pelagic limestone beds, marls and mudstones throughout the succession consist mainly of Campanian–Maastrichtian forms and suggest mainly basinal depositional conditions. The presence of Radotruncana cf. calcarata (Cushman) accompanied by Globotruncanita elevata (Brotzen) in the basinal unit of the succession indicates an early late Campanian age for the lower part of the succession. Inoceramid bivalves have been collected from the upper part of the succession. The fauna is dominated by ‘Inoceramus’ tenuilineatus Hall and Meek, 1854 and Cataceramus haldemensis (Giers, 1964); other taxa recognised are: ‘Inoceramus’ algeriensis Heinz, 1932, Platyceramus vanuxemi (Meek and Hayden, 1860), ‘Inoceramus’ cf. nebrascensis Owen, 1852, Cataceramus aff. barabini (Morton, 1834), Cataceramus gandjaensis (Aliev, 1956), and ‘Inoceramus’ sp.; the assemblage indicates the ‘Inoceramus’ tenuilineatus Zone; corresponding to the middle–late Campanian boundary interval. The uppermost part of the succession is characterized by the presence of the trace fossils Scolicia strozzii and Scolicia isp., indicating a mixed Skolithos-Cruziana ichnofacies. This ichnofacies suggests a well-oxygenated environment.
Źródło:
Acta Geologica Polonica; 2014, 64, 4; 393-418
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Viscoelastic Materials Using Free-Layered and Sandwiched Samples: Assessment and Recommendations
Autorzy:
Ozer, M.
Koruk, H.
Sanliturk, K.
Powiązania:
https://bibliotekanauki.pl/articles/1194059.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.35.+z
46.80.+j
Opis:
Viscoelastic materials are widely used in many applications in practice. However, determination of the elastic and damping properties of these materials is quite difficult in the sense that the identified results may contain high degree of uncertainty. The characterization of viscoelastic materials using the Oberst beam method, based on non-contact excitation and response measurements, is revisited in this paper. The effects of signal processing parameters such as frequency resolution in Frequency Response Function (FRF) measurements, as well as the effects of various single-degree-of-freedom modal analysis methods, including circle-fit, half-power and line-fit are investigated first. Then, the modal loss factors, Young's modulus and shear modulus of some sample viscoelastic materials are identified using both the free-layered and sandwiched samples. The results obtained from different tests are compared, discussed and some recommendations are made so as to identify the damping and elastic properties of typical viscoelastic materials with better accuracy. Analyses of a large number of FRF measurements show that the selection of the appropriate signal processing parameters and the use of appropriate modal analysis method can be very significant during the identification of viscoelastic materials. By following the approach presented in this paper, the damping and elastic properties of viscoelastic materials can be identified with better accuracy using either free-layered or sandwiched samples. The material properties obtained by this approach can be used for developing valid structural models and/or for damping optimization purposes.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1251-1254
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Experimental and Theoretical Double Differential Cross Sections of CH₄ at 250 eV Impact Energy
Autorzy:
Isik, N.
Yavuz, M.
Aksoy, E.
Ozer, Z.
Ulu, M.
Sahlaoui, M.
Boumediene, L.
Bouamoud, M.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401296.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
In this study, experimental and theoretical double differential cross section (DDCS) data for methane-electron interaction mechanism after the impact of a 250 eV electron have been comprehensively determined for a wide energy range of the detected electron, from 50 to 225 eV. The first Born-One Coulomb wave modeling with Gamow factor has been calculated to analyze experimental DDCS results for a correct description of the electron impact ionization of methane molecule. It is found that these theoretical calculations are successful to describe the post-collision interaction effects due to the Coulomb long-range interaction between the outgoing electrons in the final state. A considerable agreement is found between experimental and theoretical results.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1112-1114
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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