Autor: Ozer, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Physical separation route for printed circuit boards
Autorzy:: Burat, F.
Özer, M.
Tematy:: physical methods
PCBs
environment
copper
gold
silver; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109975.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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.
Tematy:: Turkey
Central Black Sea Region
Trachystemon orientalis
plant population
wild plant
herbal plant
edible plant
medicinal plant
mineral composition
nutritional property; Pokaż więcej
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Powiązania:: https://bibliotekanauki.pl/articles/12666302.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: B-Spline Solution for a Convection-Diffusion Equation
Autorzy:: Caglar, H.
Caglar, N.
Ozer, M.
Tematy:: 02.60.-x
02.60.Lj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1194831.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Numerical Solution of Fractional Diffusion Equation by Using Local Polynomial Regression
Autorzy:: Caglar, H.
Caglar, N.
Ozer, M.
Tematy:: 02.60.-x
02.60.Lj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1194848.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effects of Alkali Metallization on the Luminescence Degradation of Porous Silicon
Autorzy:: Kayahan, E.
Özer, M.
Oral, A.
Tematy:: 78.55.Ap
78.55.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1491506.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Characterization of Viscoelastic Materials Using Free-Layered and Sandwiched Samples: Assessment and Recommendations
Autorzy:: Ozer, M.
Koruk, H.
Sanliturk, K.
Tematy:: 46.35.+z
46.80.+j; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1194059.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: B-Spline Solution and the Chaotic Dynamics of Troeschs Problem
Autorzy:: Caglar, H.
Caglar, N.
Ozer, M.
Tematy:: 05.45.Pq
02.60.-x
02.60.Lj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1291812.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Late Messinian palynoflora from Central Anatolian Plateau (Çankırı Basin)
Autorzy:: Atalar, M.
Kovacova, M.
Ozer, M.S.K.
Utescher, T.
Tematy:: ALErl project
climatic boundary
tectonic boundary; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184454.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Sintering Behaviour of ZnO:Cu Ceramics Fabricated by Sol-Gel Derived Powders
Autorzy:: Bahşi, Z.
Oral, A.
Aslan, M.
Kayahan, E.
Ozer, M.
Tematy:: 81.05.Je
81.05.Mh; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1491465.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Bioactive compounds, antibacterial and antifungal activities of two Cirsium species
Autorzy:: Gulen, D.
Sabudak, T.
Orak, H.H.
Caliskan, H.
Ozer, M.
Tematy:: Asteraceae
Cirsium
Cirsium creticum
Cirsium italicum
hexane extract
antibacterial action
antifungal activity; Pokaż więcej
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Powiązania:: https://bibliotekanauki.pl/articles/12307832.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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