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Tytuł:
Phase States in Potassium Oleate+Water and Potassium Oleate+Water+Decanol Lyotropic Systems
Autorzy:
Nesrullajev, A.
Kazanci, N.
Yildiz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1968963.pdf
Data publikacji:
1998-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Df
82.70.-y
82.70.Dd
Opis:
In this work the investigations of the characteristic textures and the dynamics of their concentration and temperature transformations in potassium oleate+water lyotropic system have been carried out. The effect of the decanol on lyotropic mesomorphism as well as on the character of typical textures and the concentration ranges of lyotropic liquid crystalline mesophases have also been studied. The phase states diagrams of the potassium oleate+water and potassium oleate+decanol+water lyotropic liquid crystalline systems are presented.
Źródło:
Acta Physica Polonica A; 1998, 94, 1; 25-32
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Istanbul disaster information system
Autorzy:
Torun, M. K.
Korkmaz, N.
Karaman, H.
Yagci, A.
Yildiz, S. S.
Ozkan, A.
Sahin, M.
Tari, E.
Powiązania:
https://bibliotekanauki.pl/articles/225748.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
klęski żywiołowe
zarządzanie kryzysowe
Turcja
natural disasters
crisis management
Turkey
Źródło:
Reports on Geodesy; 2006, z. 5/80; 527-536
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stokes Shift and Band Gap Bowing in $In_xGa_{1-x}N$ (0.060 ≤ x ≤ 0.105) Grown by Metalorganic Vapour Phase Epitaxy
Autorzy:
Yildiz, A.
Dagdelen, F.
Aydogdu, Y.
Acar, S.
Lisesivdin, S.
Kasap, M.
Bosi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813499.pdf
Data publikacji:
2008-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
78.20.-e
78.40.Fy
78.55.-m
Opis:
We presented the results of electrical and optical studies of the properties of $In_xGa_{1-x}N$ epitaxial layers (0.060≤x≤0.105) grown by metalorganic vapour phase epitaxy. Resistivity and Hall effect measurements of the samples were carried out at room temperature. Optical properties of the samples were characterized by photoluminescence and optical absorption spectroscopy. The comparison between the photoluminescence and the optical absorption measurements gives the Stokes shift. We explained the observed Stokes shift in terms of Burstein-Moss effect. The band gap versus composition plot for $In_xGa_{1-x}N$ alloys is well fitted with a bowing parameter of≈3.6 eV.
Źródło:
Acta Physica Polonica A; 2008, 113, 2; 731-739
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural characteristic of N2 shielding gas in coating FeCrC composite to the surface of AISI 1030 steel with PTA method
Wpływ zawartości azotu w gazie osłonowym na mikrostrukturę powłok FeCrC na stali AISI 1030 otrzymanych metodą napylania plazmowego
Autorzy:
Yildiz, T.
Kaya Gür, A.
Powiązania:
https://bibliotekanauki.pl/articles/351583.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
napylanie plazmowe
modyfikacja powierzchni
węglik chromu
mikrostruktura
plasma transferred arc coating
surface modifications
chromium carbide
chromium nitrurs
microstructure
Opis:
In this study, FeCrC powder was alloyed on the surface of AISI 1030 steel with FeCrC powder having 70% Cr ratio with the Plasma Transferred Arc Welding Method. In the coating process performed with the Plasma Transferred Arc Welding Method, N2 gas at 1-3-5% ratio was added to the shielding gas. The coating layer was analysed using optical microscope (OM), scanning electron microscope (SEM), X-ray diffractogram (XRD) and X-ray energy dispersive spectrometer (EDS). As a result of optical microscope and microstructure analyses, it was determined that the coating layer and the sub-layer were connected to each other metallurgical and there were austenite ( γ), Fe-Cr, Fe23(C)6, and Cr7C3 phase and carbides and CrN in the structure.
W pracy badano nakładanie powłok z proszku FeCrC o zawartości 70% chromu na powierzchni stali AISI 1030 metodą PTA. W czasie nakładania powłoki zawartość azotu w gazie ochronnym wynosiła 1, 3, 5%. Uzyskane powłoki badane były za pomocą mikroskopii optycznej, skaningowej mikroskopii elektronowej, dyfrakcji rentgenowskiej i mikroanalizy rentgenowskiej. W oparciu o wyniki obserwacji i analiz mikrostruktury stwierdzono, że powłoka i warstwa pośrednia połączone są ze sobą metalurgicznie. Stwierdzono obecność austenitu, Fe-Cr, Fe23(C)6, Cr7C3 oraz węglików i CrN w mikrostrukturze.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 3; 723-729
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Properties of Hydroxyapatite Powders Synthesized by Chemical and Biomimetic Techniques
Autorzy:
Hazar Yoruç, A.
Karakaş, A.
Koyun, A.
Yildiz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1491408.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.J-
Opis:
Hydroxyapatite $[HA; Ca_{10}(PO_4)_6(OH)_2]$ which composes inorganic phase of bones and teeth is one of the biomedical materials for artificial bone, reconstruction of broken or disordered bones, coating of metallic biomedical materials and dental surgery with its great biocompatibility. In this study, HA powders were synthesized from aqueous suspensions containing $H_3PO_4$ and $Ca(OH)_2$ with 1.67 Ca/P ratios (chemical HA, CHA) and second process is carried out in simulated body fluids consisting of $(NH_4)_2HPO_4$ and $Ca(NO_3)_2 \cdot 4H_2O$ as biomimetic hydroxyapatite (BHA). Moreover, properties of bovine HA (BoHA) and commercial HA (CoHA) were compared with properties of synthesized HA powders. Chemical structures of synthesized powders have been examined by the Fourier transform infrared technique and X-ray diffraction. The results showed that BHA powders have a pure HA content and no secondary phase, CHA also has monetite phase as secondary phase with HA in its structure. Particle size analysis was carried out with laser particle sizer and zeta-sizer, surface area of powders has been analyzed by the Brunauer-Emmett-Teller technique. Powder morphology is determined using scanning electron microscopy. As a result two different synthesis methods affected properties of HA powders.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 233-235
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy TOPSIS Method in Supplier Selection and Application in the Garment Industry
Metoda TOPSIS- zbiorów rozmytych zastosowana do selekcji dostawców w przemyśle odzieżowym
Autorzy:
Yayla, A. Y.
Yildiz, A.
Ozbek, A.
Powiązania:
https://bibliotekanauki.pl/articles/232616.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
selekcja dostawców
podejmowanie decyzji wielokryterialnej
metoda TOPSIS
przemysł tekstylny
supplier selection
multicriteria decision making
fuzzy TOPSIS
textil industry
Opis:
In today's world where intensive competition exists between enterprises, it is of great importance to work in cooperation with the right suppliers. Selection of the right suppliers is a significant factor in the success of enterprises. In the selection of the best supplier (s), the strengths and weaknesses of potential suppliers should be taken into consideration. Many qualitative and quantitative criteria are included in this selection process as well as the decision-maker. One of the issues that leaves the decision maker in a difficult position is selecting the most appropriate one from the alternatives available, as traditional methods may not produce a realistic solution in this process. However, multicriteria decision making methods facilitate the process of finding a solution and enable decision makers to reach the right decisions. In this study, the fuzzy TOPSIS method, which is one of the multi-criteria decision making methods, is used in this problem area to select the most appropriate supplier of garment 'X' operating in Turkey. It is detected through analyses conducted in line with the results obtained. The ranking of the three supplier firms determined by firm X are as follows in terms of closeness index values: supplier 1, supplier 3 and supplier 2.
Dla uzyskania powodzenia w prowadzeniu przedsiębiorstw bardzo ważna jest współpraca z odpowiednimi dostawcami. Decyduje o tym szereg kryteriów, które powinny być wzięte pod uwagę. Wybór oparty na tradycyjnych metodach analizy może być trudny i zawodny, dletego też zaproponowano nową multikryterialną metodę doboru opartą na analizie zbiorów rozmytych. Analizę porównawczą przeprowadzono porównując trzech zróżnicowanych dostawców.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 4 (93); 20-23
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalised Choquet Integral Algorithm for Subcontractor Selection in the Textile Industry – A Case Study for Turkey
Ogólny algorytm całkowy Choqueta dla selekcji poddostawców w przemyśle tekstylnym Turcji
Autorzy:
Yayla, A. Y.
Yildiz, A.
Yildiz, K.
Powiązania:
https://bibliotekanauki.pl/articles/233057.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
subcontractor selection
Turkish textile industry
generalised Choquet integral methodology
wybór podwykonawcy
turecki przemysł tekstylny
algorytm całkowy Choqueta
Opis:
Turkish textile firms work under a heavily competitive atmosphere in terms of prices due to globalisation. Firms have to take into consideration several criteria in order to survive the global market conditions and to maintain profitability. Contractor companies have to select the optimal subcontractor in order to meet these criteria and in business. Therefore the decision to choose subcontractors is of great importance for the success of enterprises. In solving the problem of subcontractor selection, multiple criteria should be considered, for which multi-criteria decision-making methods are used. This paper presents a case study which regards the selection of the optimal subcontractor for a Turkish textile firm. In order to solve the selection problem generalized Choquet integral methodology was used based on a hierarchical decision model. In the conclusion section of the study, optimal subcontractor selection results are presented.
W wyniku globalizacji przedsiębiorstwa tureckie pracują w warunkach zintensyfikowanej konkurencji, w związku z tym muszą brać pod uwagę zróżnicowane kryteria dla utrzymania się na rynku. Dla spełnienia tych kryteriów dostawcy muszą wyselekcjonować odpowiednich poddostawców. Artykuł przedstawia metody odpowiedniego doboru poddostawców w tureckim przemyśle tekstylnym. W tym celu stosuje się ogólny całkowy model Choqueta. W podsumowaniu pracy przedstawiono optymalne metody selekcji poddostawców.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 6 (102); 16-21
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Electrical Properties and Electromagnetic Shielding Effectiveness of Polypyrrole Coated Cotton Yarns
Badanie właściwości elektrycznych i efektywności ekranowania pola elektromagnetycznego przędz bawełnianych pokrytych polipyrolem
Autorzy:
Yildiz, Z.
Usta, I.
Gungor, A.
Powiązania:
https://bibliotekanauki.pl/articles/232301.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
polypyrrole
vapour phase polymerization
electrical property
electromagnetic shielding effectiveness
polipirol
polimeryzacja w fazie gazowej
własności elektryczne
skuteczność ekranowania elektromagnetycznego
Opis:
Polypyrrole (PPy) coated cotton yarns were prepared by the vapour phase polymerisation technique at various initiator concentrations. Iron (III) chloride (FeCl3) was used as the initiator at four different concentrations (0.2, 0.4, 0.6 & 0.8 mol/l) respectively. In this work, the effects of initiator concentration on the tensile, electrical and morphological properties of the cotton yarns were investigated. PPy coated cotton yarns were woven on a handloom for the investigation of electromagnetic shielding effectiveness. The fabric samples prepared were evaluated in terms of shielding behavior. Scanning electron microscopy (SEM) analysis showed that the yarn treated with 0.4 mol/l initiator concentration gave the most uniform PPy layer and highest shielding value. The existence of PPy was proved by using Fourier transform infrared spectroscopy (FTIR) analysis.
Bawełniane przędze pokryte polipyrolem (PPy) wytworzono techniką polimeryzacji w fazie gazowej w różnych stężeniach inicjatora. Jako inicjator zastosowano FeCl3 o czterech różnych stężeniach (0,2; 0,4; 0,6 i 0,8 mol/l). Zbadano wpływ stężenia inicjatora na rozciąganie, oraz elektryczne i morfologiczne właściwości przędz bawełnianych. W celu zbadania efektywności ekranowania pola elektromagnetycznego przędze bawełniane powlekane PPy były tkane ręcznie na krośnie. Przygotowane próbki tkanin oceniano pod względem właściwości ekranujących. Analiza SEM wykazała, że z przędzy z dodatkiem inicjatora o stężeniu 0,4 mol/l uzyskano najbardziej jednolitą warstwę PPy i najwyższą wartość ekranowania. Obecność PPy potwierdzono za pomocą spektroskopii w podczerwieni z transformacją Fouriera (FTIR).
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 2 (98); 32-37
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Levels of antioxidant substances, acute phase response and lipid peroxidation in the left and right abomasum displacement in cows
Autorzy:
Mamak, N
Devrim, A K
Aksit, H
Aytekin, I
Yildiz, R
Powiązania:
https://bibliotekanauki.pl/articles/32167.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the present study was to assess metabolic changes occurring in Holstein cows with left or right abomasal displacement. Total sialic acid (TSA) values of the left abomasal displacement (LDA) group were elevated significantly (p<0.0001) as compared to the controls. In the LDA group, serum ceruloplasmin (CPN) and aspartate transaminase (AST) levels were increased significantly (p<0.0001) as well. Compared to the control group, serum glutathione (GSH) level was decreased significantly in both LDA and right abomasal displacement (RDA) groups (p<0.0001). Among the clinical examination parameters, rumen contraction rates were decreased in both LDA and RDA groups significantly (p<0.0001). These results suggest that inflammatory and oxidative parameters might have taken part in the pathogenesis of abomasal displacement. In this regard, anti-cytokine and anti-oxidant therapies developed in human medicine may also play a potential therapeutic role in the fatty liver and abomasal displacement in cattle.
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Ceria Based Novel Anode Nanopowders Synthesized by Glycine-Nitrate Process
Autorzy:
Yıldız, Ö.
Soydan, A.
Ata, A.
Tunaboylu, B.
Akın, D.
İpcizade, E.
Powiązania:
https://bibliotekanauki.pl/articles/1399974.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Ed
81.07.Wx
81.20.Ka
81.20.Ev
81.05.Mh
61.46.Df
Opis:
Novel anode nanopowder materials consisting of ceria-based components synthesized by glycine-nitrate process were investigated for solid oxide fuel cells. Glycine-nitrate process involves a self-combustion reaction at 220C of water-based nitrate and glycine solutions which subsequently can reach up to 1200°C. The resulting morphology, the size of particles and the formation of crystalline phases were characterized by differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, the Brunauer-Emmett-Teller method and Nanosizer. It was determined that dopants in ceria such as Co, Ni, Cu, V and Fe had significant effect on the morphology and size. The size distribution measured by Nanosizer was 50-600 nm, transmission electron microscopy, 5-200 nm and the Brunauer-Emmett-Teller method 100-120 nm and specific surface area of powders in the range 67.45-72.05 $m^2 g^{-1}$ as measured by the Brunauer-Emmett-Teller method. Particles were observed to have spherical structures for Cu and Fe doped powders and rod-shaped in a porous tuff microstructure for those doped with Co and Ni. Vanadium doping helped to decrease the porosity and initiated the process of spheroidization of particles.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 432-435
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of ZnO Nanopowders Synthesized by Glycine-Nitrate Gel Combustion
Autorzy:
Yıldız, Ö.
Soydan, A.
Ipçizade, E.
Akın, D.
Uçak, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1311836.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ka
81.07.Wx
61.46.Df
81.07.-b
Opis:
The morphology and other physical properties of ZnO nanopowders synthesized by glycine-nitrate gel combustion process were investigated and characterized by scanning electron microscopy, transmission electron microscopy, nanosizer and X-ray diffraction. Glycine, $NH_2CH_2COOH$, and zinc nitrate $Zn(NO_3)_2$·$6H_2O$ were dissolved in distilled water and the solution was coagulated by mixing at 90°C. The viscous gel prepared during glycine-nitrate mixing was heated at ≈220C to initiate the exothermic reactions by self-combustion where the temperature reached up to 1200°C. The glycine-nitrate ratio had a significant effect on the reaction temperature and final particle morphology. Therefore the synthesized powders have a different morphology like formless and spherical tufa ash. The particle size distribution was 50-1200 nm as measured using a nanosizer.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 664-666
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Analysis of Ce Doped $La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ}$ Nanopowders Synthesized by Glycine-Nitrate Gel Combustion
Autorzy:
Yildiz, Ö.
Soydan, A.
Ata, A.
İpçızade, E.
Akin, D.
Uçak, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1312023.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
81.07.-b
81.20.Ka
88.30.pn
Opis:
Ce doped $La_{1-x}Sr_xCo_{1-y}Fe_yO_3$ (LCSCF) is a widely used cathode material due to its high catalytic activity for oxygen reduction and high oxygen exchange coefficient. LCSCF is also known with its high ionic and electronic conductivities and low electrode polarization losses which are highly critical properties for low temperature solid oxide fuel cell applications. In this study, structural properties of the LCSCF cathode nanopowder materials synthesized by glycine-nitrate gel combustion have been investigated by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and nanosizer. Synthesized nanopowders represent volcanic ash like structures and morphologies. Ce, Sr, Co, and Fe are found to have significant effects on the structural properties of powders in terms of powders morphology, agglomerate structure, crystallite size and also lattice parameter of perovskite crystal. All synthesized ash powders have particle sizes around 50-600 nm, varying crystalline structures of perovskite and fluorite depending on molar ratio of Ce in the composition. Increasing molar Ce ratio over 0.4 is found to lead to the formation of a separate nano ceria phase in fluorite crystal structure on the surface of the synthesized powder.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 669-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Experimental Analysis of Rail Type Electromagnetic Weapons Systems
Autorzy:
Kakilli, A.
Yıldız, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1192289.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.20.Dd
03.50.De
41.20.-q
Opis:
In the study, electromagnetic weapon systems that are developed as an alternative to modern weapon systems are examined and a design for a rail type electromagnetic weapon system is intended. After a literature review on the subject, the comparison of electromagnetic and conventional weapons is made and models of electromagnetic weapons are elaborated. In the study, information of various electromagnetic weapons is provided but the focus is determined to be rail type electromagnetic weapons. Rail type electromagnetic weapons are examined in the study and the design of a low-power weapon prototype is made. For the model developed under laboratory conditions, 8 capacitors are used as a source of ignition. With the rail type electromagnetic weapon system designed, 2613.9 Joule energy is reached. The system components projected in theoretical calculations are enhanced throughout the application phase and are optimized for rail type weapon systems. For making theoretical studies and for drawing the graphs MATLAB software program is utilized. As a consequence, theoretical and empirical data is compared and commented, and some recommendations are formed.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1150-1155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Alumina and White Fused Alumina Addition on Transparent Wall and Floor Tile Glazes
Autorzy:
Yildiz, B.
Ozturk, Z.
Kara, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401290.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
Opis:
In tile manufacturing, α-Al₂O₃ is the main type of alumina used in ceramic body and glaze formulations. This raw material acts as an opacifier in porcelain tile bodies and as a matting agent in glazes. White fused alumina (WFA) is produced by fusing calcined alumina in an electric arc furnace under carefully controlled conditions. It is usually employed in floor tile glazes in order to increase their abrasion resistance. The aim of this study was to establish a better understanding of how alumina and white fused alumina addition affects the thermal behavior and aesthetic properties of wall and floor tile transparent glazes. It was shown that both alumina and fused alumina increased the softening temperatures of the standard glaze composition. Corund was the main detected phase in tile glazes incorporated with fused alumina. This result suggested that white fused alumina did not react with glassy phase to form any other crystalline phases. This result can be attributed to higher refractoriness of white fused alumina. Presence of anorthite and gahnite phases was, on the other hand, observed in the glazes with alumina addition. It was further shown that alumina was more effective in increasing opacity and reducing glossiness compared to white fused alumina.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1090-1093
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Antioxidant Activity, Phytochemicals and ESR Analysis of Lavandula Stoechas
Autorzy:
Ceylan, Y.
Usta, K.
Usta, A.
Maltas, E.
Yildiz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1402526.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.66.Uv
36.20.Kd
39.30.+w
33.35.+r
Opis:
The antioxidant activity of phytochemicals and of the methanolic extract of Lavandula stoechas was evaluated by β-carotene-linoleate bleaching, DPPH radical scavenging, ferric reducing/antioxidant power (FRAP). The obtained results were compared with antioxidant activities of synthetic antioxidants, such as BHT and BHA. The highest antioxidant activity of the extract was observed by DPPH radical scavenging assay, which was 84.45±5.1% at 1 mg ml¯¹. Rutin, rosmarinic acid, and caffeic acid were main phenolics in the extract. The total phenolic content of the methanolic extract of Lavandula stoechas was found to be 105.5±2.7 mg gallic acid equivalent (GAE). Electron spin resonance (ESR) measurements were also performed on the samples. Free radicals were determined by ESR method. g value was found to be 2.0034 for the Lavandula stoechas; 2.0052 for quercetin.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-483-B-487
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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