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    Wyświetlanie 1-10 z 10
    Tytuł:
    Novel Route to Prepare Magnetic Material $Co_3V_2O_8$ and Structural Characterization
    Autorzy:
    Celik, G.
    Kurtulus, F.
    Guler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491310.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.-m
    32.30.Rj
    33.20.Ea
    61.43.Gt
    61.66.Fn
    65.40.-b
    75.47.Lx
    81.40.Gh
    82.33.Pt
    84.40.-x
    Opis:
    $Co_3V_2O_8$ is a member of kagomé staircase oxides, represented by general formula $M_3V_2O_8$ (M = Ni, Co, Mn). It attracted great attention due to strong magnetic anisotropy, magnetic phase transition, genuine macroscopic quantum effects, strong quantum fluctuations, low-temperature ferroelectricity, field-induced magnetic transitions, complicated phase diagram and displays long-range magnetic order because of geometrical frustration. Different routes to prepare the frustrated magnetic material was reported such as floating zone technique and conventional high temperature method. $Co_3V_2O_8$ (International Centre for Diffraction Data (ICDD): 16-675) was synthesized with $Co_3O_4$ (ICDD: 80-1536) as binary phase by microwave assisted preparation using $Co(NO_3)_2 ·6H_2O$ and $NH_4VO_3$. The synthesized material was characterization by powder X-ray diffraction, the Fourier transform infrared spectroscopy, and thermogravimetric-differential thermal analysis.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 203-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Assisted Synthesis of $CeVO_4$ in the Mild Conditions, Characterization and Investigation of Luminescent Properties
    Autorzy:
    Çelik, G.
    Kurtuluş, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218871.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.40.-x
    33.50.Dq
    61.05.cp
    82.33.Pt
    Opis:
    $CeVO_4$ (ICDD: 12-757) was synthesized by microwave-assisted method by using cerium sulphate and vanadium (V) oxide in an appropriate molar ratio. Characterizations were done by X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet spectrophotometry and thermogravimetric/differential thermal analysis. The material is crystallized in tetragonal system with unit cell parameters a = 7.399 Å and c = 6.496 Å and space group I41/amd(141).
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 357-358
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spark Plasma Sintering of Boron Carbide Ceramics Using Different Sample Geometries and Dimensions
    Autorzy:
    Cengiz, M.
    Yavas, B.
    Celik, Y.
    Goller, G.
    Yucel, O.
    Sahin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1216387.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    81.05.Je
    Opis:
    $B_4C$ ceramics were fabricated by spark plasma sintering technique at 1700°C-1800C for 5 min under applied pressure of 50 MPa under vacuum atmosphere. Two different grades of $B_4C$ powder from H.C. Starck Company namely HP grade and HS grade were used in all related experiments. Effect of sample geometry and dimensions as well as sample thickness on sintering parameters were analyzed. Samples having 5 mm thickness and 50 mm diameter, 8 mm thickness in circular geometries and 50 × 50 square cross-section, 8 mm thickness were fabricated. Using the powder, which provided the densest sample, yttrium oxide $(Y_2O_3)$ was added, mixed and sintered. Optimization of SPS method production parameters for pure $B_4C$ samples and $B_4C$ samples with 5 wt% yttrium oxide additive were accomplished. The effect of geometry on density, Vickers hardness, fracture toughness, and microstructure were examined. The hardness and fracture toughness values of the samples were evaluated by the Vickers indentation technique.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 260-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pressure Effect on Glass Formation and Cluster Structure Evolution during Cooling Process of PdNi Alloy: A Molecular Dynamics Study
    Autorzy:
    Kazanc, S.
    Celik, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195946.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.pe
    83.10.Rs
    34.20.Cf
    Opis:
    Based on the embedded atom method a molecular dynamics simulation technique has been used to study the glass formation and atomic short range order in Pd-Ni binary alloy. By using radial distribution functions and Honeycutt-Andersen pair analysis methods, the structural development of this alloy is studied by quenching from the liquid at two different cooling rates and under 0 and 5 GPa pressures. The results show that the variation of local atomic bonded pairs is of great importance to understand the glass formation process and increase of the number of the ideal icosahedra under high pressure contributes to more ideal glass formation of model alloy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 49-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Promising Synthetic Route Hydrothermal Synthesis of Non-Stoichiometric Cerium and Boron Containing Compounds and Characterization
    Autorzy:
    Çelik, G.
    Kurtuluş, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1181838.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.33.Pt
    61.66.Fn
    61.05.cp
    Opis:
    Cerium, the most abundant rare earth element, and boron containing mineral (lithium tetraborate pentahydrate) were used for synthesizing rare earth borates. Alternatively, for preparing rare earth borates, hydrothermal technique can be used. The non-stoichiometric cerium and boron containing compounds were synthesized by hydrothermal method using cerium sulphate and lithium tetraborate pentahydrate in appropriate molar ratio. Characterizations were done by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy/energy dispersive X-ray analysis, and thermogravimetric/differential thermal analysis.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 325-326
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimum separation route for semi bituminous coal using semi-pilot scale pneumatic stratification jig
    Autorzy:
    Boylu, F.
    Cetinel, T.
    Guven, O.
    Karakas, F.
    Cinku, K.
    Karaagaclioglu, I. E.
    Celik, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109366.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    semibituminous coal
    dry coal cleaning
    Allair jig
    optimization
    Opis:
    Nowadays, dry beneficiation technologies with an air dense medium fluidized bed come into prominence in the field of coal preparation. In this study, the optimum conditions for different operational parameters such as discharge stargate rate, pulsation frequency, and superficial air velocity were investigated on separation of semi bituminous coal from Soma (Imbat) region using a semi pilot scale Allair jig unit. The experimental studies were carried out with two coal size fractions of -15+4 and -4+1 mm by applying rougher and scavenging stages. After the optimization of each parameter, the results for the rougher stages indicated that clean coal products could be obtained with 11.80% and 16.74% ash contents for -15+4 mm and -4+1 mm size ranges, respectively. In addition, discardable tailings with 65.44% and 60.95 % ash contents could be obtained as the result for the scavenging stages. Finally, the combination of these results for -15+1 mm size exhibited that 59.80% of the feed material with 37.70% ash content can be upgraded to clean coal products with low ash content as 19.80% while the remaining part was discarded as tailings with 68.60% ash content. These values suggested that optimizing the operational parameters of unit brings better results which are applicable in industrial application of dry processes compared to wet processes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 559-573
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved flotation of heat treated lignite with saline solutions containing mono and multivalent ions
    Autorzy:
    Ozdemir, O.
    Ersoy, O. F.
    Guven, O.
    Turgut, H.
    Cinar, M.
    Çelik, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109640.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    heat treatment
    lignite
    DLVO
    Saline Solutions
    Opis:
    Flotation of lignites is inherently difficult. However, pre-heat treatment of coal is also known to make coal surfaces more hydrophobic possibly through removal of water entrapped in the structure of coal. In this context, the objective of this study was, therefore, to determine changes in the hydrophobicity of some lignites under moderately controlled heat treatment and correlate the flotation response of lignites in different salt solutions of NaCl, KCl, CaCl2, and MgCl2 without using any reagent. The results of flotation tests suggested that under the present test conditions, it was possible to float thermally pre-treated lignite samples of partially hydrophobic character in salt solutions in the absence of collector and frother. In addition, the effect of heat treatment on hydrophobicity, and in turn flotation was explained by a theoretical model based on extended DLVO interactions to quantify the effects of both heat treatment and salt concentration on bubble-particle interactions. The results of theoretical modeling suggested that the removal of hydrogen containing groups from coal surfaces significantly contribute to the electrical double layer and hydrophobic forces that govern the magnitude of energetic barrier and also the extent of bubble-particle attachment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1070-1082
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of nitric oxide on some antioxidant enzyme activities under salt stress in sunflower plants
    Autorzy:
    Yurekli, F.
    Kirecci, O.A.
    Celik, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/12314257.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    common sunflower
    Helianthus annuus
    nitric oxide
    antioxidant enzyme
    antioxidant activity
    enzyme activity
    salt stress
    Opis:
    The effects of externally applied sodium nitroprusside on superoxide dismutase (SOD), glutathione peroxidase (GPx), ascorbate peroxidase (APX), and catalase (CAT) antioxidant enzyme activities, nitric oxide (NO) levels have been investigated in salt stress resistant and sensitive sunflower plants. NaCl treatments and SNP treatments simultaneously with salt application (NaCl+SNP) were performed. SOD, GPx, APX and CAT antioxidant enzyme activities and NO levels showed differences in leaf tissues treated with 100 µM SNP, different concentrations of NaCl, and NaCl+SNP. SOD, GPx and APX enzyme activities were generally increased in sensitive variety, but decreased in tolerant variety. However, while general increase in CAT enzyme activity was determined in tolerant type, a reduction was established in sensitive type. An increase was determined in both types in NO levels. It is evident from these results that administration of NO donor SNP can cope with reactive oxygen species in both varieties. This study indicates that negative effects of salt stress on different sun flower varieties can be recovered by nitric oxide.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 171-179
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of selective retention of Cd-Ni ions from aqueous solutions by polymer enhanced ultrafiltration
    Autorzy:
    Can, Muhammed F.
    Arslan, Fatma
    Çelik, Mehmet S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146925.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cadmium
    nickel
    polymer enhanced ultrafiltration
    polyethylenimine (PEI)
    selective heavy metal ion retention
    Opis:
    Polymer enhanced ultrafiltration (PEUF) technique economically enables separation and/or retention of various heavy metal ions from aqueous solutions for environmental and engineering problems. Polyethylenimine as the water-soluble complexation agent utilized to interact with heavy metal ions of Cd and Ni as cations in ultrafiltration experiments were modeled with protonation data to understand the mechanism. Test runs showed that an enrichment coefficient (the ratio of Cd over Ni in permeate) up to 10 was obtained at pH 4.2 in the temperature range of 20-22oC, whereas full retention of both cations is possible above pH 5.0 and those results are highly compatible with the model developed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 151913
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological analysis of organo-montmorillonites via MD simulations
    Autorzy:
    Karataş, Deniz
    Tekin, Adem
    Can, Muhammed F.
    Xu, Zhenghe
    Çelik, Mehmet S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146936.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    organo-montmorillonite
    tetradecyl dimethyl ethyl benzyl ammonium chloride
    molecular dynamics simulation
    cation exchange capacity
    binding energy
    Opis:
    Adsorption on clay surfaces has been studied intensively in recent years. The most curious subject of these studies, which are generally experimental, is how the surfactants are adsorbed at the atomic level to the surface. In this study, the adsorption of quaternary amine salt (tetradecyl dimethyl ethyl benzyl ammonium chloride–TDEBAC) to sodium montmorillonite (Na-MMT) with various cation exchange capacities (CEC) was investigated by using Molecular Dynamics (MD) simulation. In the simulations, as in the experimental studies, it was revealed that the surfactants were both adsorbed on to basal surfaces and settled between the layers. From the morphological analysis obtained from MD simulations, it was calculated that the inter-molecular interaction between the layers was higher than on the basal surface. For example, for the model with 118 CEC motif, the binding energy of all three surfactants in the models with the hydrophilic heads facing the same direction was calculated as -678.18 kcal/mol at the basal surface, while this value was found to be -688.90 kcal/mol in the interlayer. The more striking result is that in the simulations made by turning the head of the middle one of the three surfactants towards the tails of the right and left ones, only -34.86 kcal/mol binding energy was calculated on the basal surface, while this value was -525.63 kcal/mol in the interlayer. As compared middle reversed surfactant models with the same direction ones, despite increased CEC the intermolecular interaction decreased for the basal surface, but the interaction increased between the layers.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152499
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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