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Wyszukujesz frazę "Güler, M. A." wg kryterium: Wszystkie pola

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Wyświetlanie 1-10 z 13
Tytuł:
The partial slip contact problem for a monoclinic coated half plane
Autorzy:
Çömez, I.
Alinia, Y.
Güler, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/38630043.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
partial slip
monoclinic materials
fiber angle
stick/slip transition
Opis:
In this study, the partial slip contact problem for a monoclinic coated half plane indented by a rigid cylindrical punch is considered. The main objective of current study is to illustrate the effects of material anisotropy on the surface stresses, the contact width and the stick/slip region of the partial slip contact. Using the Fourier integral transform and boundary conditions of the problem, the singular integral equation of the system is obtained. Numerical results of the problem are provided for typical fibrous composites applying the Gauss-Chebyshev discretization method. Sensitivity analysis of the surface stresses is performed for both the material and geometric parameters. The results indicate that the coating fiber angle can significantly alter the distribution of contact tractions. As the fiber angle ranges from θ = 0° to θ = 90°, the contact half-length increases up to 20% whereas the stick zone half-length varies significantly.
Źródło:
Archives of Mechanics; 2022, 74, 1; 13-37
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Li-Air Batteries With EC-DEC Based Nanocomposite Electrolytes
Autorzy:
Akbulut, A.
Guler, M.
Cetinkaya, T.
Uysal, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401250.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Gj
88.80.ff
82.45.Xy
Opis:
Electrolytes based on organic carbonate solvents of ethylene carbonate (EC) and diethyl carbonate (DEC) were prepared by using LiPF₆ as the Li-source. Nano sized Al₂O₃ (50 nm) was used as a reinforcing component in order to control corrosion and Li₂CO₃ formation. Corrosion of the Li foil anode and electrochemical tests were performed by using EC/DEC/LiPF₆ and nanocomposite EC/DEC/LiPF₆/5wt.% Al₂O₃ electrolytes. Electrochemical tests were performed in the swagelok cells by using Li foil anode and carbon air cathode electrodes. Structural tests were carried out by using scanning electron microscopy (SEM), x-ray diffraction (XRD) and Raman spectroscopy. Results revealed that incorporation of nano Al₂O₃ leads to a decrease of corrosion rate of Li anode and a small decrease in the capacity of the air cells.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1023-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries
Autorzy:
Akbulut, A.
Cetinkaya, T.
Guler, M.
Uysal, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401245.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
81.20.Fw
81.15.-z
Opis:
In this study, $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were produced via a facile sol-gel method at 800°C. The surfaces of the $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn₂O₄ powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge- discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis confirmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1019-1022
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Titanium Dioxide Based Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Oguz Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399946.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
Carbon nanotube thin sheets - buckypapers - were prepared from multi-walled carbon nanotubes oxidized with different oxidation agents. Titanium dioxide films were then deposited by thermal evaporation of Ti films on buckypapers substrates followed by in situ dc plasma oxidation. The effect of oxidation power on the structural, compositional and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 390-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Antimony Doped Tin Oxide Nanocomposites for Li-Ion Batteries
Autorzy:
Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399942.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
High content carbon nanotubes mats have been produced to multi-walled carbon nanotubes. Sb doped $SnO_2$ films were then deposited by rf magnetron sputtering on buckypapers substrates. The effect of oxidation pressure on the structural, compositional, and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 383-385
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sol-Gel Synthesis of Nanocomposite $Cu-Li_4Ti_5O_{12}$ Structures for Ultrahigh Rate Li-Ion Batteries
Autorzy:
Erdas, A.
Ozcan, S.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401274.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
88.80.ff
Opis:
In this study, spinel $Li_4Ti_5O_{12}$ materials were successfully synthesized by a simple and facile sol-gel process and electroless copper deposition techniques. The characteristics of the as-prepared $Li_4Ti_5O_{12}$ and $Cu-Li_4Ti_5O_{12}$ were examined by X-ray diffraction and scanning electronic microscopy, while the electrochemical performances including charge/discharge and rate performance tests were also investigated. $Cu-Li_4Ti_5O_{12}$ electrode demonstrated the superior initial discharge capacity and rate capability to $Li_4Ti_5O_{12}$ electrode, cycled between 1.0 and 2.5 V. The enhanced rate capability can be attributed to the higher $Li^{+}$ diffusivity and lower charge-transfer resistance due to the electroless deposition of copper. Moreover, when both electrodes discharged with 80 C state of discharge conditions, the reversible capacities were further increased ım70 mAh $g^{-1}$ with excellent cycling stability and almost no irreversible capability was observed during cycling.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1026-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electrochemical Properties of Cu Coated $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ Nanocomposites for High Rate Li-Ion Batteries
Autorzy:
Algul, H.
Erdas, A.
Tokur, M.
Guler, M.
Akbulut, H.
Alp, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401278.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
81.15.-z
88.80.ff
Opis:
Several reported problems of commercial LiCoO₂ electrode materials such as high cost, toxicity, limited rate capability and safety concerns are still remain to be problematic to develop the lithium ion consumer electronics such as mobile phones, tablets and notebook computers. In this study, an alternative nanocomposite electrode material based on $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ and copper coated one were produced via a facile sol-gel method and electroless Cu deposition techniques. The resulting samples were characterized by X-ray diffraction (Rigaku DMax 2200 diffractometer) using a monochromatized Cu-Kα source (λ=1.5406 Å) and 2θ scan range from 10° to 80° with a speed of 1° $\text{min}^{-1}$. The scanning electron microscope (SEM) was used in order to characterize the morphology of the active materials. The as-synthesized $Cu//LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ composite cathode exhibits a stable capacity on cycling and good rate capability after 50 cycles and total capacity retention of 93% is obtained. The unique 2D structure of the composite cathode material, its good electrochemical performances and its relatively low cost comparing to LiCoO₂, make this material very promising for applications.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1038-1041
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Pinched Sluice in Albite Concentration
Wykorzystanie wzbogacalnika poziomo-prądowego do wzbogacania albitu
Autorzy:
Polat, E.
Aksoy, A. A.
Bozkaya, A.
Tunc, S.
Kucukler, M.
Guler, T.
Powiązania:
https://bibliotekanauki.pl/articles/318995.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
albit
mika
wzbogacanie grawitacyjne
efekt kształtu
albite
mica
gravity concentration
shape effect
Opis:
Albite (NaAlSi3O8) is an important industrial mineral especially for ceramic and glass production. Major Fe-containing impurity of albite ore is flaky mica minerals. This study was conducted to determine the applicability of pinched sluicing for pre-concentration of albite ore by exploiting shape effect. Effects of feed solid rate, tilting angle of pinched sluice, and splitter position on the rejection of Fe-containing flaky mica were tested. Pulp solid rate was determined to be the most important variable on the rate of mica rejection. Increasing the tilting angle adversely affected the separation efficiency especially above 17°. Distribution of gangue mica in the vertical cross-section of flowing film was tested manipulating the splitter height. Mica particles were observed to be crowded in upper layers of film thickness. So, flaky mica impurity was thought to be separated from feldspar ore, and a pre-concentrate was obtained. All Fe-containing coloring impurities could not be removed due to different mineralogical origins of them in the ore. Optimum operating variables were determined as follows: 56% feed solid rate, 17° tilting angle of pinched sluice, and splitter height lower or closer to 2/3 of the total pulp film thickness. Pulp solid rate of underflow stream almost linearly changed with respect to splitter height.
Albit (NaAlSi3O8) jest ważnym surowcem przemysłowym, szczególnie w ceramice i produkcji szkła. Najważniejszymi zanieczyszczeniami żelazowymi występującymi w albicie jest łuskowata mika. Celem badan było określenie możliwości wykorzystania wzbogacalnika poziomo-prądowego do wstępnego wzbogacania albitu z wykorzystaniem analizy kształtu. Badano wpływ natężenia przepływu nadawy, zawartości fazy stałej, geometrii strugi nadawy na efekt wydzielenia miki zawierającej zanieczyszczenia minerałami żelaza. Zawartość fazy stałej w nadawie została określona jako najważniejszy czynnik wpływający na efektywność procesu. Zwiększenie kąta nachylenia komory roboczej niekorzystnie wpływało na separację, szczególnie powyżej 17°. Badano wpływ rozdział miki w przekroju poprzecznym strumienia nadawy. Ziarna miki koncentrowały się w górnych warstwach strumienia. Stwierdzono, że drobne ziarna miki oddzielają się od rudy skaleniowej i można otrzymać prekoncentrat. Z uwagi na sposób występowania zanieczyszczeń nie można wydzielić wszystkich zanieczyszczeń barwiących. Określono optymalne parametry procesu: zawartość fazy stałej w nadawie 56%, kąt nachylenia rynny podawczej 17°, a wysokość rozdzielacza strugi niższa od 2/3 całkowitej grubości warstwy materiału.
Źródło:
Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 33-38
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation solutions for magnetohydrodynamics (MHD) flow of in a non-Newtonian fluid between concentric cylinders
Autorzy:
Yurusoy, M.
Guler, O. F.
Powiązania:
https://bibliotekanauki.pl/articles/265393.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ MHD
technika zaburzeń
przepływ pierścieniowy
MHD flow
perturbation technique
annular flow
third grade fluid
Opis:
The steady-state magnetohydrodynamics (MHD) flow of a third-grade fluid with a variable viscosity parameter between concentric cylinders (annular pipe) with heat transfer is examined. The temperature of annular pipes is assumed to be higher than the temperature of the fluid. Three types of viscosity models were used, i.e., the constant viscosity model, space dependent viscosity model and the Reynolds viscosity model which is dependent on temperature in an exponential manner. Approximate analytical solutions are presented by using the perturbation technique. The variation of velocity and temperature profile in the fluid is analytically calculated. In addition, equations of motion are solved numerically. The numerical solutions obtained are compared with analytical solutions. Thus, the validity intervals of the analytical solutions are determined.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 199-211
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of RF Power on Electrical and Structural Properties of Sputtered $SnO_2$:Sb Thin Films
Autorzy:
Cevher, O.
Guler, M.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Okumus, S.
Powiązania:
https://bibliotekanauki.pl/articles/1218075.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
68.55.ag
81.15.Cd
Opis:
In this work, antimony doped tin oxide ($SnO_2$:Sb) thin films were fabricated using a radio frequency magnetron sputtering system on Si wafer and glass substrates. The base pressure in the sputtering chamber was 1.0 Pa. The $SnO_2$:Sb thin films were deposited for 1.0 h in a mixture of Ar and $O_2$ environment with $O_2$/Ar ratio of 10/90 at 75, 100, and 125 W RF sputtering powers. The microstructure of $SnO_2$:Sb thin films was assessed using a field emission scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The average surface roughness $(R_{a})$ was measured with atomic force microscopy. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thicknesses of the films were measured by surface profiler.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 293-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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