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    Wyświetlanie 1-13 z 13
    Tytuł:
    Structural Characterization of Some Table Salt Samples by XRD, ICP, FTIR and XRF Techniques
    Autorzy:
    Yalçin, Ş.
    Mutlu, İ.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490744.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    Opis:
    In this study, we have investigated structure and impurities of six different salts which have a great importance in our everyday life, namely source salt, Himalayan salt, rock salt, sea salt, lake salt and reduced sodium salt (minsalt) by means of different analytical methods, namely X-ray powder diffraction, scanning electron microscope-energy dispersive X-ray spectroscopy, inductive coupling plasma optic emission spectroscopy, X-ray fluorescence spectrometer and the Fourier transform infrared spectroscopy. With the light of obtained results, suitability and performance of the different analytical methods were discussed in some details.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 50-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder
    Autorzy:
    Aktas, B.
    Albaskara, M.
    Dogru, K.
    Yalcin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030110.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    soda-lime-silica glasses
    eggshell wastes
    mechanical properties
    Opis:
    In this study, eggshell powder obtained from eggshell waste was used as a dopant in soda-lime-silica glass powders. Various eggshell-doped soda-lime-silica glass samples were produced through melting, and the effect of the eggshell powders on the mechanical properties of the soda-lime-silica glasses was investigated by micro-Vickers indentation tests. The X-ray diffraction results of the eggshell-doped glasses showed that, depending on the dopant content, different phases such as gypsum, nepheline, alunogene, aragonite, cristobalite etc. appeared. These results were different from the X-ray diffraction patterns of pure soda-lime-silica glass powders, where the phases observed included sodium aluminium silicate, sodium aluminum oxide, and silicon oxide. Although the elastic modulus of soda-lime-silica glasses increased with the addition of the eggshell powders, the dopant powders also caused an increase in the hardness of the glasses. Furthermore, it was found that the fracture toughness increased for soda-lime-silica glasses with 0.5 and 1 wt% eggshell powder, while it decreased for samples with eggshell powder contents ≥1 wt%. This behaviour could be explained by an increased depolymerization in the network connectivity of the glass when the amount of eggshell dopant increases.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 436-438
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder
    Autorzy:
    Aktas, B.
    Albaskara, M.
    Yalcin, S.
    Dogru, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030117.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    soda-lime-silica glass
    eggshell powder
    optical properties
    FTIR spectra
    Opis:
    The optical properties of soda-lime-silica glasses doped with eggshell powder were investigated using UV-visible and the Fourier transform infrared spectroscopies. Pure soda-lime-silica glass, which is colorless and transparent, turned dark green after the addition of the eggshell powder. When the eggshell powder content was ≥ 3 wt%, the glass became translucent. The maximum wavelengths in the UV spectra of the soda-lime-silica glasses doped with 0.5, 1, 3, and 5 wt% eggshell powder were observed at 300.20, 277.40, 284.40, and 312.40 nm, respectively. The Fourier transform infrared spectra of the eggshell-doped soda-lime-silica glass samples were very similar to that of the base undoped glass. The bands at approximately 770-820 cm¯¹ could be attributed to the Si-O-Si symmetric stretching of the bridging oxygen between the tetrahedra, while the bands at approximately 970 cm¯¹ were related to the Si-O-Si antisymmetric stretching of the bridging oxygen within the tetrahedra.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 442-444
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Radiation Shielding Properties of Soda-Lime-Silica Glasses Doped with Different Food Materials
    Autorzy:
    Çetin, B.
    Yalçin, Ş.
    Aktas, B.
    Albaşkara, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031927.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.40.-n
    29.40.Mc
    Opis:
    In this study, radiation shielding properties of soda-lime-silica glasses doped with different food materials such as the egg shell and the peanut shell powders were investigated. Egg shell and peanut shell powders were obtained by grinding of waste shells in an agate mortar. The SLS glass samples with varying egg shell/peanut shell content were produced by melting. The measurements have been performed using the gamma spectrometer, containing a 3" × 3" NaI (Tl) detector, and connected to a full featured 16K channel Multi Channel Analyzer provided by ORTEC/MAESTRO-32 software.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 988-990
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties of soda-lime-silica glasses with variable peanut shell contents
    Autorzy:
    Aktas, B.
    Albaskara, M.
    Yalcin, S.
    Dogru, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057876.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Kf
    81.70.-q
    64.70.P
    Opis:
    In this study, the mechanical properties of soda-lime-silica glasses were investigated by using micro-Vickers indentation tests, while varying the amount of peanut shell powder added to the glass. Peanut shell powder was obtained by grinding peanut shells. It was added as a dopant to glass at 0.5-5 wt.%, with the final glass samples being produced by melting. Peanut shell addition had led to a decreased density of the soda-lime-silica glasses, and X-ray diffraction data of the peanut shell-doped soda-lime-silica glasses indicated the presence of two crystalline phases, namely, anorthite (Na_{0.45}(Ca_{0.55}Al_{1.55}Si_{2.45}O₈) and magnesium aluminum silicate (MgAl₂Si₃O_{10})₆. The Young's modulus values of the soda-lime-silica glasses increased along with the amount of peanut shell powder added. Peanut shell addition to the soda-lime-silica glasses has also caused increased hardness. Fracture toughness values of these glass samples were in the range of 0.91-1.04 MPa m^{1/2}. Thus, the mechanical properties (e.g. E and K_{C}) of soda-lime-silica glasses could be enhanced through peanut shell addition.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 511-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite
    Autorzy:
    Ucurum, M.
    Bayram, O.
    Toraman, O. Y,
    Kılıc, H.
    Yalcın, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109347.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcite
    surface modification
    mechano-chemical
    calcium stearate
    properties of modified calcite
    Opis:
    Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 μm) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 688-700
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Electronic Properties of Ternary $Al_x In_{1-x}P$ Alloys
    Autorzy:
    Bagci, S.
    Yalcin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402552.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ak
    71.15.Mb
    03.75.Hh
    71.90.+q
    Opis:
    III-V based alloys and heterostructures have much attention due to their great device applications as well as for the development of electronic, optic and optoelectronic devices. Because of this reason, the present study reports an investigation of the structural optimization of ternary alloys $Al_x In_{1-x}P$. Method of WIEN2k code is applied considering Wu-Cohen correlation energy functional based on density functional theory. We have constructed 1× 1× 1 supercell containing 8 atoms in zinc-blende structure. For all studied alloys structure, we have implemented geometric optimization before the volume optimization calculations. In this work, the structural and electronic properties of ternary alloys $Al_x In_{1-x}P$ are presented. The obtained equilibrium lattice constants of studied binary compounds are more compatible with experimental data compared to standard semilocal (LDA-PBE) calculations.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-97-B-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-1 Model of Noninteracting Nanoparticles
    Autorzy:
    Yalçin, O.
    Erdem, R.
    Övűnç, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812046.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.60.-d
    05.50.+q
    05.70.Ln
    Opis:
    In this work, we presented a spin-1 model to investigate the magnetic properties of noninteracting monodomain nanoparticles based on the pair approximation. Nearest-neighbor pair interactions are incorporated between the Ising spins in three parts that are core, core-surface, and surface within the nanoparticle. Using the spin-1 Ising model of magnetization in the pair approximation, we calculated the free energy and minimized with respect to pair variables to obtain the field-cooled magnetization. Hysteresis loops of the system were plotted for various values of exchange coupling constants, and axial anisotropy of strength which couples the core, core-surface, and surface regions. The coercive field and its linear fit to the data were plotted as a function of radius of ferromagnetic nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 835-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The optoelectronic properties of Sb doped BBi compounds
    Autorzy:
    Ustundag, M.
    Yalcin, B.
    Aslan, M.
    Bagcı, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065716.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    78.20.Ci
    71.20.-b
    61.72.Vv
    Opis:
    We have determined structural, electronic and optical properties of BBi_{1-x}Sb_x alloy by using density functional theory based on the full potential linearized augmented plane wave method. For the exchange correlation potential, the generalized gradient approximation of Perdew, Burke, and Ernzerhof has been performed. The structural properties, including lattice constants and bulk modulus have been calculated by changing x concentration. We have investigated the effect of composition on lattice constant, bulk modulus and band gap. Properly, direct/indirect band character of BBi_{1-x}Sb_x has been investigated depending on the x concentration. Then we have determined some basic linear optical properties BBi_{1-x}Sb_x alloy in direct band gap region. The obtained results have been compared with available studies. All the calculations have been performed after geometry optimization. As far as we know, no experimental or theoretical data are presently available for the studied ternary alloy BBi_{1-x}Sb_x (0 < x < 1).
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 98-100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Gap Calculations of Ternary $InN_{0.03125}P_{0.96875}$ Alloy
    Autorzy:
    Ustundag, M.
    Yalcin, B.
    Bagci, S.
    Aslan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401943.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ak
    71.15.Mb
    03.75.Hh
    71.90.+q
    Opis:
    In the current study, structural and electronic properties of ternary dilute nitride $InN_{x}P_{1-x}$ alloys have been investigated by using density functional theory. The equilibrium lattice parameter of studied material has been calculated in zinc-blende phase. 2× 2× 2 supercell with 64 atoms has been used for calculations. The lattice parameter of $InN_{0.03125}P_{0.96875}$ alloy is found to be 5.852 Å. By means of the equilibrium lattice parameter, electronic band structure has been calculated for dilute 3.125% nitride composition. It is found that a ternary $InN_{0.03125}P_{0.96875}$ alloy is a direct band gap semiconductor with energy band gap of 1.198 eV.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-135-B-137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Discussion on e-Navigation and Implementation in Turkey
    Autorzy:
    Aydogdu, Y.
    Yalcin, E.
    Yurtorren, C.
    Aksoy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/116683.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    IALA Approach
    IMO Documents
    e-Navigation
    e-Navigation Concept
    e-Navigation Implementation Process
    IALA Guidelines
    Turkish Waterways
    Electronic Navigation
    Opis:
    Electronic navigation, which has great important for ship management, has taken a step with technological improvements. In the result of these enhancements, new systems appeared as well as existing systems and these systems began to be integrated each other or used data of obtaining from the others like that AIS, Radar, ECDIS etc. All these and likely future systems have been put together under the roof of enhanced navigation (e-navigation) is defined by organizations such as International Maritime Organization (IMO), International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA), General Lighthouse Authority (GLA) etc. Especially IALA guidelines serve as model future applications in Turkish waterways. In this study aim to redefine e-navigation concept based on maritime safety awareness, maritime service portfolio (MSC 85/26) and discuss possible applications.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 81-87
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Byssinosis and COPD rates among factory workers manufacturing hemp and jute
    Autorzy:
    Er, Mukremin
    Emri, Salih A.
    Demir, Ahmet U.
    Thorne, Peter S.
    Karakoca, Yalcin
    Bilir, Nazmi
    Baris, Izzettin Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2177088.pdf
    Data publikacji:
    2015-09-15
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    byssinosis
    endotoxin
    COPD
    hemp
    jute
    occupational health
    Opis:
    Objectives Prior studies have been performed on cotton textile plants throughout the world. This study was planned to identify the rate of byssinosis and chronic obstructive pulmonary disease (COPD) in hemp and jute workers and those who worked with both of them. Material and Methods The study was realized in a factory which consecutively processed hemp and jute. The study enrollment included 266 people, 164 of whom were active workers and 102 were retired. A questionnaire, plain chest X-rays, physical examination and pulmonary function tests were performed. Dust levels were measured in various sections of the factory during 8 h work shifts. Endotoxin levels of various quality hemp fibers and dusts were measured. Results The rate of byssinosis (28.2%) was higher among the workers that who exposed to both jute and hemp dust. The frequency of chronic bronchitis in retired workers who previously smoked was higher (20%) as compared to currently smoking workers (17%). High dust levels were measured in some parts of the factory (mean (M) = 2.69 mg/m³). Working in dense dust areas, active smoking, being older than 40 years of age, being an ex-smoker, and working in the factory for a period exceeding 15 years were significantly associated with bronchitis and emphysema development. High endotoxin levels were determined for fine hemp dust (605 EU/mg), coarse hemp dust (336 EU/mg) and poor quality hemp fibers (114 EU/mg), whereas in fresh hemp stalks the level of endotoxin was determined to be lower (0.27 EU/mg). Conclusions Because of high exposures to jute and hemp dusts that are associated with high byssinosis rates, personal protection and environmental hygiene is crucial to prevention of byssinosis.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 1; 55-68
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological characterization of Cyclamen sp. grown naturally in Turkey: part II
    Morfologiczna charakterystyka Cyclamen sp rosnących w Turcji w warunkach naturalnych: część II
    Autorzy:
    Curuk, P.
    Sogut, Z.
    Izgu, T.
    Sevindik, B.
    Tagipur, E.M.
    Teixeira de Silva, J.A.
    Serce, S.
    Solmaz, I.
    Aka Kacar, Y..
    Yalcin Mendi, N.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543503.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The morphology of 279 accessions of Cyclamen sp. growing naturally in Turkey, namely C. alpinum (syn. C. trochopteranthum), C. graecum, C. hederifolium (syn. C. neapolitanum) and C. mirabile, was characterized. Plants with intact tubers were collected from locations in Antalya, Isparta, Aydın, Muğla, İzmir and Denizli, determined by GPS, where they grow naturally in spring and autumn. The morphology of the four Cyclamen species was characterized using one year old regenerated plants based on 27 morphological traits (13 flower, 11 leaf, 2 plant, 1 tuber). There were distinct differences among these accessions related to petal colour, pedicel length, leaf length and width, leaf shape, and tuber diameter. Even though principle component analysis confirmed the grouping of characters into species-specific clusters, a wider range of morphological data as well as molecular data are needed for more reliable conclusions to be drawn about the classification of these Cyclamen species.
    Scharakteryzowano morfologię 279 obiektów Cyclamen sp. rosnących w warunkach naturalnych w Turcji, mianowicie C. alpinum (syn. C. trochopteranthum), C. graecum, C. hederifolium (syn. C. neapolitanum) i C. mirabile. Rośliny z nienaruszonymi bulwami zebrano ze stanowisk w Antylii, Isparcie, Aydın, Muğla, İzmir oraz Denizli, według wskazań GPS, gdzie rosną naturalnie wiosną i jesienią. Scharakteryzowano morfologię czterech gatunków Cyclamen przy użyciu jednorocznych zregenerowanych roślin w oparciu o 27 cech morfologicznych (13 dotyczyło kwiatów, 11 liści, 2 roślin, 1 bulw). Między badanymi obiektami stwierdzono znaczne różnice dotyczące barwy płatków, długości szypułki, długości i szerokości liścia, kształtu liścia oraz średnicy bulwy. Chociaż analiza składników potwierdziła zgrupowanie cech w grupy specyficzne dla gatunku, to potrzeba więcej danych morfologicznych oraz molekularnych, aby wyciągnąć rzetelne wnioski na temat klasyfikacji tych gatunków Cyclamen.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 5; 205-224
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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