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    Tytuł:
    Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy
    Autorzy:
    Çolak, M.
    Dışpınar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/379886.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A357 alloy
    grain refinement
    alloy modification
    Taguchi approach
    stop A357
    rafinowanie ziarna
    modyfikacja stopu
    metoda Taguchi
    Opis:
    Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner’s additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi’s experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 35-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Copper Addition to Aluminium Alloys on Surface Roughness in Terms of Turning Operation
    Autorzy:
    Özen, F.
    Fiçici, F.
    Dündar, M.
    Çolak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033527.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    Opis:
    Aluminium alloys have found usage in numerous industries due to some superior properties, such as high strength-to-weight ratios and high oxidation resistance. Aluminum alloys can be strengthened by some techniques. One of them, the most practical one, is precipitation hardening in aluminum alloys. By adding Cu, aluminum gains strength and hardness. In this work the machinability of unalloyed aluminum and aluminum alloyed with 4% and 8% of Cu have been investigated. Machinability assessment was executed in terms of surface roughness during turning operation. Specimens were manufactured by sand casting method, which is a commonly utilized casting operation. In machinability experiments, three different cutting tool materials were employed. Three different cutting speeds and three different feed rates have been used. Effect of these feeds, speeds and cutting tool materials on surface roughness has been studied. In addition, effect of Cu addition to aluminum alloys on surface roughness has been examined.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 467-469
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination and mapping of cadmium accumulation in plant leaves on the highway roadside, Turkey
    Autorzy:
    Çolak, M.
    Gümrükçüoğlu, M.
    Boysan, F.
    Baysal, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/204967.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    accumulation
    cadmium
    emission inventory
    GIS
    plant leaves
    Opis:
    This study investigates cadmium (Cd) accumulation in the plant leaves of juglans regia (walnut) and cydonia oblanga (quince) trees related to traffic emissions on the highway roadside. The plant leaf samples were collected from 20 sites on the D-100 Highway roadside and washed with deionized water before analyzed. Determination of Cd was carried out using an inductively-coupled plasma-mass spectrometer after microwave digestion of the samples. Cd concentration on the plant leaves was found to be between 0.04–0.11 mg/kg. In order to determine the traffic-based emissions, vehicles were counted and an emission inventory was prepared. 0.18 tons of Cd was found to be delivered into the atmosphere every day. Cd accumulation depends on traffic density because there were no residential area and industrial plants. The distribution of Cd accumulation caused by traffic emissions was mapped by using a geographic information system (GIS). The maps showed that the Cd accumulation was high in the areas near the highway and then gradually decreased by moving away from the highway.
    Źródło:
    Archives of Environmental Protection; 2016, 42, 3; 11-16
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837851.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837813.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The comparison of antioxidant compounds and mineral content in some pomegranate (Punica granatum L.) genotypes grown in the East of Turkey
    Autorzy:
    Okatan, V.
    Çolak, A.M.
    Güçlü, S.F.
    Gündoğdu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11855314.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    Turkey
    plant cultivation
    pomegranate
    Punica granatum
    antioxidant compound
    antioxidant content
    phenolic compound
    mineral content
    plant genotype
    Opis:
    In recent times, pomegranate has been one of Turkey’s most important commercial fruit crops for consumption and export. In this study, the chemical composition of pomegranate (Punica granatum L.) fruits grown in the central area of Bitlis province (Eastern Turkey) was investigated. For this purpose, total phenolic content, ascorbic acid content, total anthocyanin and antioxidant activity and minerals content were evaluated. The highest total phenolic contents were determined in 13BIT1 (6477.78 mg gallic acid equivalents 100 g–1 fresh matter). The highest ascorbic acid was determined in 13BIT2 of pomegranate genotype (60.78 mg 100 g–1). Radical scavenging activity (DPPH) were determined between 13BIT18 (78.15) to 13BIT1 (31.49). Total anthocyanin of genotypes was measured between 13BIT19 (156.03) to 13BIT17 (55.37), respectively. The highest mineral compositions of the pomegranate genotypes were 998.00% N, 301.00 mg 100 g–1 P, 1708.61 mg 100 g–1 K, 55.21 mg 100 g–1 Ca, 116.79 mg 100 g–1 Mg, 5.1 mg 100 g–1 Fe, 1.91 mg 100 g–1 Cu, 0.41 mg 100 g–1 Mn and 1.20 mg 100 g–1 Zn, respectively. The results indicate that pomegranate genotypes have an important value of health and nutrition for the human.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 4; 201-211
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eco-Friendly Soaking Process Using Tannic Acid as an Alternative Bactericide
    Autorzy:
    Zengin, A. C. A.
    Çolak, S. M.
    Zengin, G.
    Kiliç, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/204698.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bactericidal
    leather industry
    soaking
    tannic acid
    środek bakteriobójczy
    przemysł skórzany
    moczenie
    tanina
    Opis:
    Eco-friendly leather processes based on the usage of natural products have become a potentially attractive issue for leather industry during the last few decades. Synthetic protective chemicals like bactericides used in most soaking process are known as hazardous substances and cause tannery effluents with high concentrations of Chemical Oxygen Demand (COD). In the present study, the effect of tannic acid on microorganisms, skin, wool and effluent were investigated in order to demonstrate the applicability of tannic acid in soaking process instead of commonly used bactericides. The bacterial load (cfu/ml), COD and Nitrogen Content (N) of the soaking effluents and Total Kjeldahl Nitrogen (TKN) content of skins and wools were investigated. Application of 0.5 and 1 wt% tannic acid concentrations was more effective than commercial bactericide, while comparable results were achieved by 0.1 and 0.3 wt% tannic acid. The application of tannic acid for soaking process resulted in lower COD and N values of effluents. The results show that tannic acid has the potential to be an alternative, eco-friendly bactericide for leather industry by reducing the pollution of leather soaking process.
    Źródło:
    Archives of Environmental Protection; 2014, 40, 1; 3-12
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the long term use of a computer on median, ulnar and radial sensory nerves in the wrist region
    Autorzy:
    Bamac, Belgin
    Colak, Serap
    Dundar, Gulmine
    Selekler, Hamit M.
    Taşkiran, Yavuz
    Colak, Tuncay
    Balci, Emin
    Powiązania:
    https://bibliotekanauki.pl/articles/2179017.pdf
    Data publikacji:
    2014-12-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    computer users
    ulnar
    median
    radial
    nerve
    Opis:
    Objectives: Repetitive microtrauma or overuse injuries may often affect upper extremities of the long term computer users. The aim of this study was to compare sensory nerve conduction velocities (SNCV) for median, radial and ulnar nerves in the wrist of computer users with the same parameters in controls who do not use computers regularly. Material and Methods: Twenty one male computer users (age: mean (M) = 28.3 years ± standard deviation (SD) = 7.5 years) and 21 male control subjects (age: M±SD = 24.1±4.6 years) were recruited for the study. Limb length and the perimeters of the dominant arm and forearm were measured for each subject. The neurophysiological study consisted of measuring sensory nerve conduction of the median, ulnar and radial nerves. Results: The sensory conduction velocities of both median and ulnar nerves were significantly delayed in the dominant arm of the computer users compared to the controls. In addition, sensory conduction velocity of the median nerve was significantly delayed in the dominant extremity of the computer users compared to their non-dominant extremity. Conclusions: This study shows that computer users have a tendency toward developing median and ulnar sensory nerve damage in the wrist region. Mechanism of delayed SNCV in the median and ulnar nerves may be due to sustained extension and ulnar deviation of the wrist during computer mouse use and typing. Reduced SNCV changes were more apparent on the dominant side of the median nerve. This may indicate the increased neural deficits related to an increased use of the dominant side. Further investigation is needed to determine how to reduce potential risk factors at this stage in order to prevent development of median or ulnar neuropathy in the long term computer users.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 6; 1026-1035
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunological harmony: the role of magnesium in the development of euthyroid Hashimoto’s thyroiditis
    Autorzy:
    Celik, E.
    Celik, M.
    Bulbul, B.Y.
    Andac, B.
    Okur, M.
    Colak, S.Y.
    Yekdes, A.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/53363878.pdf
    Data publikacji:
    2024
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Magnesium is a trace element that is closely linked to thyroid function and autoimmune thyroiditis. Numerous chronic disorders are also linked to low serum magnesium levels; however, it is unclear how its level relates to the development of autoimmune thyroiditis. In the present study, we evaluated the relationship between Hashimoto’s thyroiditis (HT) and serum magnesium levels in 104 patients: 52 with low and 52 with normal serum magnesium levels. Patient records were retrospectively evaluated and the demographic data, serum levels of thyroid-stimulating hormone, anti-thyroid peroxidase antibody (TPOAb), anti-thyroglobulin antibody (TGAb) and serum magnesium levels were recorded. Patients with low magnesium levels were found to have higher levels of TPOAb, TGAb and radiological evidence of HT when compared to those with normal magnesium levels (P = 0.001, P = 0.007, and P = 0.001, respectively). In logistic regression analysis, ultrasonographic HT findings were found to be significantly more common in the magnesium deficient group (P = 0.001). The serum magnesium level of 0.72 mmol L-1 was determined to be the appropriate cut-off point for the presence of HT ultrasonographic findings with 68.9% sensitivity and 64.4% specificity. As a result, in the present study, low serum magnesium levels were found to be associated with significantly higher incidence of ultrasonographic findings of HT, which may suggest that adequate magnesium supplementation may be an independent protective factor against Hashimoto’s Thyroiditis.
    Źródło:
    Journal of Elementology; 2024, 29, 2; 367-378
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effect of Solidification Time and Addition Amount of Inoculation on Microstructure and Hardness in Lamellar Graphite Cast Iron
    Autorzy:
    Çolak, Murat
    Uslu, Emin
    Teke, Çağatay
    Şafak, F.
    Erol, Ő.
    Erol, Y.
    Çoban, Y.
    Yavuz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lamellar graphite
    graphite cast iron
    inoculation
    solidification time
    modeling
    grafit
    żeliwo
    wszczepienia
    czas krzepnięcia
    modelowanie
    Opis:
    Material suppliers typically recommend different additive amounts and applications for foundry practices. Therefore, even in the production of the same standard materials, different results may be obtained from various production processes on different foundry floors. In this study, the liquid metal prepared with the addition of different proportions of a FeSi-based inoculation, which is most commonly used in foundries in the production of a cast iron material with EN-GJL-250 lamellar graphite cast iron, was cast into sand molds prepared with a model designed to provide different solidification times. In this way, the optimization of the inoculation amounts on the casting structure for different solidification times was investigated. In addition, hardness values were determined depending on solidification time in varying amounts of inoculation additions. SolidCast casting simulation software was used to determine the casting model geometry and solidification time. In the scope of the study, sand casting, modeling, microstructure analysis, image analysis, microstructure analysis, and hardness tests techniques were used. When the results are examined, the required amount of inoculation for the optimal structure is optimized for the application procedure depending on the casting module and the solidification time.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 24--33
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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