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Wyświetlanie 1-15 z 24
Tytuł:
Bioactive compounds, antibacterial and antifungal activities of two Cirsium species
Autorzy:
Gulen, D.
Sabudak, T.
Orak, H.H.
Caliskan, H.
Ozer, M.
Powiązania:
https://bibliotekanauki.pl/articles/12307832.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Asteraceae
Cirsium
Cirsium creticum
Cirsium italicum
hexane extract
antibacterial action
antifungal activity
Opis:
In the GC-MS analysis, 81 bioactive phytochemical compounds were identified in hexane extracts of Cirsium creticum and Cirsium italicum. Terpenoids constituted the main fractions of C. italicum (70.95%), while hydrocarbons were most abundant compounds of C. creticum (41.11%). The antibacterial activity and antifungal activity of extracts from two Cirsium species was tested using microdilution methods. According to the results of antibacterial activity, the highest inhibition effect of C. creticum was found on B. subtilis, E. coli and P. aeruginosa. The highest inhibition effect of C. italicum was found on B. subtilis. In the results of antifungal activity, the highest inhibition effect of C. creticum was found on P. chrysogenum and the highest inhibition effect of C. italicum was found on C. krusei. The present work is the first report on hexane extracts compounds of two Cirsium species as well as antibacterial and antifungal activities.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 213-221
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral composition and nutritional properties of Trachystemon orientalis (L.) G. Don populations in the Central Black Sea Region of Turkey
Autorzy:
Özer, M.Ö.
Aksoy, M.
Powiązania:
https://bibliotekanauki.pl/articles/12666302.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Turkey
Central Black Sea Region
Trachystemon orientalis
plant population
wild plant
herbal plant
edible plant
medicinal plant
mineral composition
nutritional property
Opis:
This study was conducted to determine the mineral contents and some nutritional properties of Trachystemon orientalis L. growing in the Central Black Sea Region, Turkey, and that is consumed as vegetable. Surveys and field studies were started during the spring semester of 2011 (April–May) and they were collected from Samsun and Ordu, where they are intense. In the study, it is was observed that pH, dry matter, content of ash, N, protein, vitamin C, macro- and microelements examined in Trachystemon orientalis varied considerably. The pH, dry matter, ash, N, protein and C content of the plants ranged from 6.61 to 6.88, 13.0 to 22.1%, 9.2 to 17.0%, 2.3 to 3.3%, 14.1 to 20.3 % and 0.12 to 39.03 mg/100g, respectively. Mineral analysis showed that Trachystemon orientalis contained considerably high amounts of potassium (3883.8 to 5791.4 mg/100g), phosphorus (339.7 to 540.9 mg/100 g), calcium (159.4 to 432.4 mg/100g), magnesium (108.0 to 176.4 mg/100 g), iron (10.7 to 63.1 mg/100 g), sodium (22.1 to 66.3 mg/100g), copper (0.6 to 1.5 mg/100 g), manganese (1.5 to 3.6 mg/100g) and zinc (2.3 to 7.6 mg/100g). Mineral compositions of the plants varied significantly depending on the genotypes. T. orientalis was determined as abundant in contents of vitamin C, minerals and protein.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 157-167
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of crushing type on the efficiency of flowing film separation
Autorzy:
Sirkeci, A. A.
Gul, A.
Bulut, G.
Ozer, M.
Guven, O.
Perek, K. T.
Powiązania:
https://bibliotekanauki.pl/articles/109918.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
particle shape characteristics
liberation degree
chromite
shaking table
Opis:
In recent years, the influence of different crushing systems (compression, impact, attrition) has been receiving more attention due to their significant role on particle liberation and shape of particles. The objective of this study was to investigate the effects of different crushing systems on both liberation degree and shape factors of chromite particles along with their enrichment conditions by shaking table. The tests were conducted on -1+0.5, -0.5+0.212 and -0.212 mm size fractions using the Wilfley type shaking table. The results of these tests showed that concentrates with higher metal contents were obtained by impact crushing of chromite in proportion to higher liberation degree and roundness of particles. Therefore, it was found that selective breakage can well be obtained by impact crushing in all fractions. The results of this study demonstrated the importance of crushing type on the liberation and enrichment processes.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 601-608
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical separation route for printed circuit boards
Autorzy:
Burat, F.
Özer, M.
Powiązania:
https://bibliotekanauki.pl/articles/109975.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
physical methods
PCBs
environment
copper
gold
silver
Opis:
Recently, the consumption of electrical and electronic equipment (EEE) has increased with the advanced technology. A wide range of components made of metals, plastics and other substances are contained in EEE. Electronic waste (e-waste) is easily demounted and separated by manually methods; however, printed circuit board (PCB) which is one the most common components of e-waste need to be recycled with economic and environmental technologies. In this paper, employing physical separation methods to ground waste PCB, an eco-friendly, simple and environmental process for separation of valuable metals was designed and proposed. A heavy fraction with 40.8% Cu, 350 ppm Au and 475 ppm Ag content at recovery of 95.4% Cu, 77.7% Au and 65.1% Ag was obtained from a feed assaying 12% Cu, 130 ppm Au and 200 ppm Ag using shaking table separator. Cu grade was increased from 52.4% to 73.9% with the recovery over 92% by dry magnetic separator and copper alloys were separated from the waste matrix with 98% Cu recovery using electrostatic separator.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 554-566
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Crash Boxes Light Weighting with Syntactic Foams by the Finite Element Analysis
Autorzy:
Özer, H.
Can, Y.
Yazıcı, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031574.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Dh
62.20.-x
61.41.+e
Opis:
Light-weighting is a new scope in the automotive industry to accommodate new emission regulations. The parts produced with conventional metallic materials are replaced with parts produced by using light weight or high strength materials, to obtain light weighted equivalents of the same strength. Foam core sandwich structures, high strength steels, composite materials are the most used alternative materials. Syntactic foams that show outstanding performance in case of high-speed collisions have an excellent utility as energy absorbers in vehicle crash boxes. Syntactic foams are modeled in crash boxes at various filling rates and filling patterns in the context of this study. As results of the FEM analyses, it is observed that syntactic foams have excellent crash performance, as well as weight-reducing effect in vehicle crash boxes.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 734-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural characterisation of Co-Cr-Mo casting dental alloys
Autorzy:
Szala, M.
Beer-Lech, K.
Gancarczyk, K.
Kilic, O.
Pędrak, P.
Özer, A.
Skic, A.
Powiązania:
https://bibliotekanauki.pl/articles/103216.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
casting
microstructure
Co-Cr-Mo
biomaterials
dendritic structure
phase composition
chemical composition
dental cobalt alloy
Opis:
The study compares the microstructure of three commercial dental cobalt matrix alloys with related chemical composition declared by the manufacturer. Casts were produced with lost wax method, then melted and casted with centrifugal induction casting machine. The Co-Cr-Mo alloys were casted according to the manufacturers procedure. The samples’ chemical composition and phase composition, respectively, using WDXRF (Wavelength Dispersive X-Ray Fluorescence) and XRD (X-ray Diffarction) methods were analysed. Casts microstructure by mean of LOM (Light Optical Microscopy), SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive X-ray Spectroscopy) were investigated. Vickers hardness HV10 was measured. Quantitative microstructure evaluation was performed by means of computer image processing. The results of the chemical composition indicate the high stability of the chemical composition for alloy A. In case of alloys B and C, there was a significant difference in carbon content. Quantitative differences in image of microstructure between of castings A and B, C were noticed. The greater amount of precipitates was recorded for castings with higher carbon content. In all investigated castings, the presence of β matrix solution and M23C6 carbide precipitations was found.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 76-82
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Messinian palynoflora from Central Anatolian Plateau (Çankırı Basin)
Autorzy:
Atalar, M.
Kovacova, M.
Ozer, M.S.K.
Utescher, T.
Powiązania:
https://bibliotekanauki.pl/articles/184454.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ALErl project
climatic boundary
tectonic boundary
Opis:
Within the framework of the Marie Curie FP7-PEOPLE-2013-ITN program, the ALErT project targets on tectonic and climatic boundary conditions in the regions along the densely populated and the associated with natural hazards part of the Central Anatolian Plateau. The wide Central Anatolian Plateau (CAP) extends between the Aegean extensional and Bitlis /Zagros compressional zones. The Çankırı Basin was opened in central Anatolia during Late Cretaceous between the Kırşehir block in the south and Sakarya continents in the north. During the Neo-Tethys closure, the basin became a large intermontane basin covered with continental sedimentary environments (Kazancı et al. 1999). During the Late Miocene, there were different types of lacustrine environments between the northern and southern parts of this basin. Age evidence of the Çankırı Basin deposits has been obtained from the European mammalian faunal zones, because the Sr analysis results have not be significant to interpreted age (Mazzini 2015). To figure out the paleoenvironmental and palaeoclimate changes in Çankırı Basin biotic (palynology) and abiotic proxy data (geochemical, δ18O – δ13C isotopes analyses and CaCO3) were analysed. Fifteen samples from Hancili Formation, Tuglu Suleymanli crossing border, Bozkır Formation and Değim Formation were collected from claystone, dark silty clay, gypsum and breccia with silty gypsum layers in the Çankırı Basin. The samples were treated by standard palynological procedures described by Cour (1974). All pollen samples, residues, and slides are stored in Comenius University in Bratislava, Slovakia. Each sample collected in the Çankırı Basin contains 150 pollen grains excluding Pinus . Pollen identification was performed under a Zeiss light microscope, and under a Quanta FEG250 Scanning electron microscope (SEM) used for high resolution imaging of pollen grains in Institute of Electrical Engineering Slovak Academy of Sciences. The pollen diagram was prepared with Tilia*-Graph (2.0) (http://www.chrono.qub.ac.uk/datah/tilia.html). According to Mosbrugger & Utescher (1997), coexistence approach derived quantative paleoclimate parameters. To explain the ecological characteristic, we used version of the Past 3.x – the Past of the Future free software scientific statistical data analysis program (http://folk.uio.no/ohammer/past/). Head map was prepared using program for four formations. The uplift during the Late Messinian in Çankırı Basin has been confirmed by palynological data and head map evaluation. We applied Xact 8 for the graphic presentation to show vegetation composition. We developed Steppe-Forest Index using a ratio of appropriate species of pollen (Traverse 1978), that serve as a climatic indicator (warm to cold), while interpreting aridity we follow Cour & Duzer (1978). As a consequence, the Poaceae/total Asteraceae ratio in a pollen diagram can be used as a climate index to find out dry to wet zones ines (Popescu 2006). It was calculated based on palynological results (using cluster analysis) to show that sections have four climate cycles with three dry periods. Based on those calculations, we confirmed long term cooling trend during the Late Messinian to the Plio-Pleistocene in Çankırı Basin. Most pollen spectra are mainly presented by Asteraceae, Chenopodiaceae, and Poaceae and by trees of Pinus, Cathaya, and Fagus. The group of herbs is important in the pollen spectra and mainly consists of Poaceae, Chenopodiaceae and Asteraceae, which document open grassland type of vegetation with warm – temperate climate.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 57-58
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Secondary Electron Distribution of Atmospheric Nitrogen Molecule by 350 eV Electron Impact
Autorzy:
Ozer, Z.
Ulu, M.
Dogan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398662.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.80.Gs
Opis:
Electron collisions with nitrogen molecules have an important role for example in ionospheric and auroral phenomena in the upper atmosphere of the Earth. These processes are important in electrical discharges involving atmospheric gases. Due to the key features electron collisions with N₂ have been under particular interest and extensively studied for last decades. Cross-section data is extremely useful in understanding the systematic of the ionization process. Since the earliest cross-section measurements of N₂, there have been a great number of improvements and new developments on theoretical and experimental methods. A crossed-beam apparatus so called electron spectrometer that has an effusive gas source and electron gun is used to obtain the cross-sections. Scattered and ejected electrons are analyzed by hemispherical electron analyzer. Here we report recent measurements of double differential cross-section for N₂ as a function of electron angle at incident electron energy of 350 eV.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 20-22
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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
Tytuł:
Processing, Mechanical and Nuclear Characterization of Boron Carbide Ceramics Consolidated by Spark Plasma Sintering
Autorzy:
Cengiz, M.
Ozer, S.
Buyuk, B.
Tugrul, A.
Yucel, O.
Goller, G.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401969.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
81.20.Ev
Opis:
Boron carbide (B₄C) ceramics were produced by spark plasma sintering technique with 5, 10, 15, and 20 vol.% aluminum (Al) in order to improve sintering behaviours of B₄C ceramics. B₄C ceramics were produced, having square cross-section and 50 × 50 × 5 mm³ dimensions. The sintering process was carried out at different temperatures by applying 40 MPa of pressure with 100°C/min under vacuum. The effects of various amounts of Al additive and sintering temperature on density, vickers hardness, fracture toughness and microstructure were examined. The hardness and fracture toughness of the samples were evaluated by the Vickers indentation technique. Microstructures of the samples were characterized by scanning electron microscopy technique. Fast neutron attenuation properties of the ceramics having highest density were also investigated.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-187-B-189
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
Wyświetlanie 1-15 z 24

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