Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(67)
- Merdan, Mehmet(59)
- Duran, Celal(49)
- Ozdes, Duygu(46)
- Kaygusuz, Abdullah(45)
- Demir, Selim(37)
- Turan, Ibrahim(37)
- Karsli, Orhan(36)
- Öztürk, Serkan(35)
- Dokuz, Abdurrahman(34)
- Araz, Onur(32)
- Kandemir, Raif(31)
- Kulakaç, Nurşen(29)
- Sipahi, Ferkan(29)
- Arslan, Mehmet(27)
- Baltaci, Cemalettin(27)
- Baltacı, Cemalettin(27)
- Kurt, Kemal(27)
- Topal, Fevzi(27)
- Gücer, Mehmet Ali(25)
- Peker, Iskender(25)
- Aydin, Faruk(24)
- Bayrakdaroglu, Serdar(24)
- Maden, Nafiz(24)
- Ozturk, Samet(24)
- Vural, Alaaddin(24)
- Yolcu, Halil(24)
- Yücel, Cem(24)
- Aliyazicioglu, Yuksel(23)
- Kankal, Murat(23)
- Reis, Hatice Catal(23)
- Ürkek, Bayram(23)
- Günen, Mehmet Akif(22)
- Kurnaz, Muammer(22)
- Topal, Meryem(22)
- Karimullah, Suud Sarim(21)
- Uysal, Ibrahim(21)
- Ashyralyyev, Charyyar(20)
- Aydin, Aydanur(20)
- Bayraktar, Alemdar(20)
Yayınlar
- MakaleYalnız künye2013Scopus SJRQ1Assessment of wave energy resource of the Black Sea based on 15-year numerical hindcast data
Akpinar, Adem; Kömürcü, Murat I.hsan
In this study, the existence and variability of wave energy resource potential of the Black Sea based on 15-year hindcast data is described in detail. The hindcasts of wave parameters were carried out by using the third generation wave prediction model (Simulated WAves Nearshore - SWAN), which is one of the most popular numerical wave models and has been widely used for estimating ocean waves. The model was forced with the ECMWF ERA Interim wind fields and applied with a spatial resolution of about 0.0167°. ×. 0.0167° and a model time step of 6. h to resolve efficiently offshore and nearshore wave conditions. The results were presented in the form of charts of the spatial distribution of significant wave height and wave power, on a monthly, seasonal and annual basis. Annual energy was calculated in the study region with the hindcast data set covering 15. years (1995-2009). The areas with the highest wave energy resource were determined and the south west coasts of the Black Sea are suggested as the best site for the installation of a wave farm. It was determined the western parts of the Black Sea (especially the south-west) are exposed to energetic waves more than the eastern parts.
AtıfScopus167WoS155OpenAlex180
İncele - MakaleYalnız künye2013Scopus SJRQ1Production of human fat milk analogue containing α-linolenic acid by solvent-free enzymatic interesterification
Ilyasoglu, Huri
Human milk fat (HMF) analogue was synthesized by lipase-catalysed interesterification of tripalmitin with extra virgin olive oil, and flaxseed oil in a solvent-free media. Lipozyme® TL IM, immobilized sn-1,3 specific lipase, was used as biocatalysts. Substrate molar ratio, reaction temperature and reaction time were used to model and to optimize the reaction conditions via response surface methodology. Good quadratic models were obtained for the incorporation of palmitic acid and α-linolenic acid. At the optimal conditions generated from the model, the palmitic acid and α-linolenic acid contents of the product were found to be 25.2g/100g and 15.9g/100g, respectively. The chemical properties (free fatty acid, iodine value, and saponification value), sn-2 positional fatty acid composition, and sterol composition of the final structured lipid (SL) were determined. Furthermore, the oxidative stability of the SL and the SLs with antioxidants (BHT, gallic acid, and rosemary extract) was evaluated. The peroxide and thiobarbituric acid reactive substances (TBARS) values of the SLs showed they had antioxidant activity on the SL. The HMF analogue synthesized in this study may have potential use in infant formulas to provide omega-3 fatty acids (α-linolenic acid).
AtıfScopus18WoS14OpenAlex19İncele - MakaleAçık Erişim2013Scopus SJRQ4Evaluation of protein tyrosine phosphatase activity in patients with acute leukemia
Akdogan, Elif; Cengiz, Sevil; YIlmaz, Mustafa; Sönmez, Mehmet; Durmus, Ahmet; Oval, Ercüment; Omay, Serdar Bedii
Protein tyrosine phosphatases regulate physiological processes including growth, differentiation, metabolism and the cell cycle. Together with tyrosine kinases, they control the phosphorylation state of tyrosine residues of signaling proteins. An increased level of protein phosphorylation results in abnormal proliferation and many cancer types show a mutation or deletion of a protein tyrosine phosphatase gene. In this study we evaluated the protein tyrosine phosphatase activity in acute leukemia patients. Tyrosine phosphatase activity in bone marrow mononuclear cells of acute leukemia patients was measured using a tyrosine phosphatase assay system kit and compared with a control group. We found that tyrosine phosphatase activity in acute leukemia patients was high compared to the controls. According to subgroups of acute leukemia, tyrosine phosphatase activity in the AML-M2 subgroup was high compared to the controls. The effect of increased level of protein tyrosine phosphatase activity on leukemogenesis needs further evaluation. Studies in a large group of patients are needed to emphasize the importance of tyrosine phosphatase activity in acute leukemia patients.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2013Scopus SJRQ1The effects of high temperature on mechanical properties of cementitious composites reinforced with polymeric fibers
Çavdar, Ahmet
Polymeric fibers are cheap and popular materials used in the concrete industry, and they may improve the mechanical properties of cementitious composites under high temperature. In this study, three different types of polymeric fibers - Copolymer Polypropylene/polyethylene (CPP), Homopolymer Polypropylene (HPP), and Aramid (AR) - are added to cement mortars with the aim to investigate their mechanical contributions to mortars under high temperature, comparatively. These fibers are added into mortars in five different ratios (0.0%, 0.3%, 0.6%, 0.9% and 1.2%) by volume. The mortars are subjected to following temperatures: 21 °C (normal conditions), 100 °C (oven dry), 450 °C, 650 °C and 850 °C. It is concluded that polymeric fibers used in this study contribute to the flexural strength of mortars under normal dry conditions (100 °C). This effect continues clearly up to 450 °C and polymeric fibers show effects on flexural strength especially at 450 °C. Each fiber shows the best performance different addition ratio when flexural and compressive strength are taken into consideration at the same time under high temperature. The highest increase in flexural strength and the lowest decrease in compressive strength are at 0.3-0.9% fiber addition ratio for HPP, at 0.3-0.6% fiber addition ratio for CPP and at 0.9% fiber addition ratio for AR for every temperature.
AtıfScopus57WoS56OpenAlex59İncele - MakaleAçık Erişim2013Scopus SJRQ1A study on 3-D stress distributions in the bi-adhesively bonded T-joints
Akpinar, Salih; Aydin, Murat Demir; Özel, Adnan
In this study, the normal (σx,. σy,. σz) and shear stress (τxy,. τyz,. τzx) distributions occurring in a bi-adhesively bonded T-joint with was investigated via a non-linear three dimensional finite element analysis. For this purpose, first of all, using 2024-T3 aluminum alloy as the adherend and the support, a two-part paste (DP 460) and a film type (SBT 9244) as adhesive, two different types of T-joint samples (single-adhesively bonded T-joint and bi-adhesively bonded T-joint) were produced for experimental studies. After experimental studies on the three different T-joint types were conducted, stress analyses in the T-joints were performed with a three-dimensional finite element analysis by considering the geometrical non-linearity and the material non-linearities of the adhesive (DP460 and SBT9244) and adherend (AA2024-T3). Finally, for a given adherend, the lower the stiffness of the adhesive used in the overlap, the lower the stress concentration, leading to potentially higher joint strength. The use of relatively low stiffness adhesives at the ends of the overlap in a bi-adhesive can decrease the stress concentration and, therefore, potentially lead to higher joint strength.
AtıfScopus47WoS40OpenAlex50İncele - MakaleYayıncıda açık erişim2013Scopus SJRQ4Serum anti-carbonic anhydrase I and II antibodies and polycystic ovary syndrome; [Serum anti-karbonik anhidraz I ve II antikorları ve polikistik over sendromu]
Menteşe, Ahmet; Güven, Süleyman; Sümer, Ayşegül; Turan, Ibrahim; Demir, Selim; Karahan, Süleyman Caner; Alver, Ahmet
Aim: The aim of this study is to investigate anti-carbonic anhydrase antibodies (anti-CA I and CA II antibodies) in the sera of women with polycystic ovary syndrome (PCOS). Methods: In this study serum anti-CA I and II antibody levels of age and BMI matching fifty women with PCOS and fifty women without PCOS on day three of menstrual cycle were assessed with an ELISA method previously developed by Hosoda and modified by Alver et al. Results: The mean serum anti-CA I antibody levels were significantly higher in women with PCOS and anti-CA II antibody levels were not significantly different in women with PCOS compared with control subjects. For serum anti-CA I antibody, the absorbance higher than 0.484 (mean + 3SD of control subjects) was taken as positive, Anti-CA I antibody was detected in 13 of 50 patients with PCOS (26%). Considering serum anti-CA II antibody, the absorbance higher than 0.654 (mean + 3SD of control subjects) was taken as positive. Anti--CA II antibody was detected in 2 of 50 patients with PCOS (4%). All patients with positive anti-CA II antibody also had positive anti-CA I antibody. Autoantibodies specifically reactive to CA I were found to be present at a higher frequency than CA II in the serum of subjects with PCOS in the present study. Conclusion: The results may suggest that autoimmune responses against CA I may be involved in the pathogenesis of PCOS.
AtıfScopus9WoS7OpenAlex8İncele - MakaleYalnız künye2013Scopus SJRQ13-D non-linear stress analysis on the adhesively bonded T-joints with embedded supports
Akpinar, Salih; Aydin, Murat Demir; Temiz, Şemsettin; Özel, Adnan
In the present study, it is aimed to compare mechanical behaviors of T-joint types with embedded and non-embedded supports subjected to bending moment. For this purpose, after experimental studies on the two different T-joint types were conducted, stress analyses in the T-joints were performed with a three-dimensional finite element method by considering the geometrical non-linearity and the material non-linearities of the adhesive (DP460) and adherend (AA2024-T3). Finally, stress analyses and experimental results show that the variation of the geometry of the bonding zone, e.g., embedding the supports, would change the stress distributions and strength of the joint. Additionally, it is seen that T-joints with embedded supports carry 30% more load than T-joints with non-embedded supports although their bending stiffnesses decrease.
AtıfScopus17WoS15OpenAlex19İncele - MakaleYalnız künye2013Scopus SJRQ3The effects of different breeding methods on fattening performance and parameters related to slaughter, carcass and some meat quality in broiler chickens; [Farklı yetiştirme metotlarının etlik piliçlerde besi performansı, kesim ve karkas özellikleri i̇le bazı et kalite parametreleri üzerine etkisi]
Lacin, Ekrem; Coban, Omer; Aksu, Muhammet Irfan; Sabuncuoglu, Nilufer; Das, Huseyin
The present study was aimed at the comparison of floor-based growth (FBG) and caged-based growth (CBG) systems in broiler production for growth performance and parameters related to slaughter, carcass and meat quality. Ninety one-day-old male Ross-308 chicks constituted the material of the study. It was determined that, in Groups FBG and CBG, the differences between body weight and cumulative body weight values were statistically very significant (P<0.01). The final body weights measured at the end of the trial and the mean body weight gain values in Groups FBG and CBG were determined as 2530 g - 2046 g and 2389.16 g - 1904.77 g, respectively. The end-trial final feed conversion rates of Groups FBG and CBG were determined as 1.82 and 1.88, respectively, and it was ascertained that the difference between the values of the two groups was statistically insignificant (P>0.05). While the hot and cold dressing percentages and the neck, wing, drumstick and tail percentages did not statistically differ between Groups FBG and CBG (P>0.05), values pertaining to breast meat displayed significant differences (P<0.05). It was determined that the L*, b* and C* values pertaining to breast meat and the L*, a*, b* and C* values pertaining to chicken drumsticks displayed statistically significant differences (P<0.05, P<0.01) between the trial groups.
AtıfScopus9WoS8OpenAlex6İncele - MakaleYalnız künye2013Scopus SJRQ3Assessment of heavy metal accumulation in the roadside soil and plants of Robinia pseudoacacia, in Gumushane, Northeastern Turkey; [Yol kenari{dotless}ndaki topraklarda ve Robinia pseudoacacia bitkilerindeki aǧi{dotless}r metal birikiminin deǧerlendirilmesi, Gümüşhane, kuzeydoǧu Türkiye]
Vural, Alaaddin
The concentrations of heavy elements were studied in the soils and plants of Robinia pseudoacacia, along a highway passing through Gümüşhane City Center, Turkey. The aim of this study is to understand heavy metal accumulation due to dense traffic load, industrialization, urbanization, and/or geological features of the region. The assessment of the heavy metal accumulation of the soils is based on the Geoaccumulation Index and Enrichment Factor, and that of plants, is based on the Bioaccumulation Factor. According to the Geoaccumulation Index, soil samples were uncontaminated for Cr, Co, Cu, Rb, and Sr elements, uncontaminated to moderately contaminated for V, Ni, Ba, and Zn, and moderately to heavily-heavy contaminated for As. The contamination of soil samples changes from moderate-heavy-extremely contaminated degree for Pb. According to the Enrichment Factor; soil samples show, no enrichment-moderately-severe enrichment for V. Considering the Zn element, enrichment is in minor to severe enrichment. On the other hand, element enrichment is severe to very severe enrichment for As and that of Pb is minor to an extremely severe enrichment level. The data revealed that the soil in the study area is significantly contaminated for Zn, As, and Pb. Also, concentration levels of Cu, Fe, Mo, Ni, Sr, and Zn in the shoots of Robinia pseudoacacia at some location were determined as above and/or exceeded the upper limit of the normal range.
AtıfScopus16WoS22OpenAlex30İncele - MakaleYalnız künye2013Scopus SJRQ2Determination of Pb(II), Zn(II), Cd(II), and Co(II) ions by flame atomic absorption spectrometry in food and water samples after preconcentration by coprecipitation with Mo(VI)-diethyldithiocarbamate
Tufekci, Mehmet; Bulut, Volkan Numan; Elvan, Hamide; Ozdes, Duygu; Soylak, Mustafa; Duran, Celal
A new, simple, and rapid separation and preconcentration procedure, for determination of Pb(II), Cd(II), Zn(II), and Co(II) ions in environmental real samples, has been developed. The method is based on the combination of coprecipitation of analyte ions by the aid of the Mo(VI)-diethyldithiocarbamate- (Mo(VI)-DDTC) precipitate and flame atomic absorption spectrometric determinations. The effects of experimental conditions like pH of the aqueous solution, amounts of DDTC and Mo(VI), standing time, centrifugation rate and time, sample volume, etc. and also the influences of some foreign ions were investigated in detail on the quantitative recoveries of the analyte ions. The preconcentration factors were found to be 150 for Pb(II), Zn(II) and Co(II), and 200 for Cd(II) ions. The detection limits were in the range of 0.1-2.2 μg L-1 while the relative standard deviations were found to be lower than 5 % for the studied analyte ions. The accuracy of the method was checked by spiked/recovery tests and the analysis of certified reference material (CRM TMDW-500 Drinking Water). The procedure was successfully applied to seawater and stream water as liquid samples and baby food and dried eggplant as solid samples in order to determine the levels of Pb(II), Cd(II), Zn(II), and Co(II) ions.
AtıfScopus33WoS28OpenAlex30
İncele - MakaleAçık Erişim2013Scopus SJRQ2Estimation of the soil strength parameters in Tertiary volcanic regolith (NE Turkey) using analytical hierarchy process
Ersoy, Hakan; Betül Karsli, Melek; Çellek, Seda; Kul, Bilgehan; Baykan, Idris; Parsons, Robert L.
Costly and time consuming testing techniques and the difficulties in providing undisturbed samples for these tests have led researchers to estimate strength parameters of soils with simple index tests. However, the paper focuses on estimation of strength parameters of soils as a function of the index properties. Analytical hierarchy process and multiple regression analysis based methodology were performed on datasets obtained from soil tests on 41 samples in Tertiary volcanic regolith. While the hierarchy model focused on determining the most important index properties affecting on strength parameters, regression analysis established meaningful relationships between strength parameters and index properties. The negative polynomial correlations between the friction angle and plasticity properties, and the positive exponential relations between the cohesion and plasticity properties were determined. These relations are characterized by a regression coefficient of 0.80. However, Terzaghi bearing capacity formulas were used to test the model. It is important to see whether there is any statistically significant relation between the calculated and the observed bearing capacity values for model testing. Based on the model, the positive linear correlation characterized by the regression coefficient of 0.86 were determined between bearing capacity values obtained by direct and indirect methods.
AtıfScopus10WoS10OpenAlex14İncele - MakaleAçık Erişim2013Scopus SJRQ2Detection of class 1 integron in Acinetobacter baumannii isolates collected from nine hospitals in Turkey
ÇIÇek, Ayşegül Çopur; Düzgün, Azer Özad; Saral, Ayşegül; Kayman, Tuba; ÇIzmecI, Zeynep; Balci, Pervin Özlem; Dal, Tuba; Firat, Mehmet; Tosun, Ismail; Alitntop, Yasemin Ay
Objective: To investigate the antibiotic resistance genes inserted into class 1 and class 2 integrons in Acinetobacter baumannii (A. baumannii) isolates obtained from nine different cities in Turkey. Methods: A collection of 281 A. baumannii clinical isolates were collected from nine diferent state hospitals in Turkey and were confirmed as A. baumannii by conventional biochemical, API testing and bla-OXA-51 specific PCR. The isolates were examined by PCR for existence of class 1 and 2 integron gene cassettes. Results: They were characterized by antimicrobial susceptibility testing and the highest resistance rates were determined for piperacillin (90.03%), ciprofloxacin (87.54%), cefepime and trimethoprim/sulfamethoxazole (81.13%). The lowest resistance rates was for cefotaxime (3.55%). class I integrons were detected in 6.4% (18/281) of A. baumannii strains and no class 2 integron was detected. The gene cassettes of class 1 integrons AacC1-AAC(3) I-aadA1, AacC1-aadA1, AAC(3)-I, AAC(3)-I -AAC(3)-I -aadA1, TEM-1, AAC(3)-I-aadA1 - AAC(3)-I -AAC(3)-I, AAC(3)-I -AAC(3)-I -AAC(3)-I -aadA1, AAC(3)-I - aadA1, AAC(3)-I-AAC(3)-I, AAC(3)-I-aadA1-AAC(3)-I-aadA1, AAC(3)-I-AAC(3)-I-aadA1-AAC(3)-I-aadA1 were detected in eighteen strains. The aac genes family were most frequently found integrated into the class 1 integrons and it was followed by aadA genes and TEM-1 genes. Conclusions: This is an extensive study on the distribution of class 1 integron among A. baumannii in Turkey. In addition to these, two new alleles were observed. Their percentage rates of similarity to other cassettes are 95% aadA1 (TKA18) and 89% aadA1 (ANKA3).
AtıfScopus25OpenAlex24İncele - MakaleYalnız künye2013Scopus SJRQ3Determination of the pomological and morphological properties of white mulberry types growing in transition region between mild and continental climates
Kalkişim, Özgün
This study was performed in 2010 and 2011 in order to determine some pomological and morphological properties of 15 different mulberry types growing in the ecological conditions of Gümüşhane province. From chosen types, fruit and leaf samples were collected and analyzed during their growing season for the period of two years. By the end of the study, the following highest values were observed: fruit weight 27.30 g, fruit width (resp. height) 15.62 mm (resp. 30.32 mm), leaf width (resp. height) 100.84 mm (resp. 130.02 mm), leaf stalk length 50.94 mm, Brix 23.28%, pH 6.20, titratable acidity 0.20, invert sugar 20.57, sucrose 1.46 and total sugar 22.02 g/100 g. As a result of the study, knowing the fact that mulberry is an important raw material in the continuously growing dried fruit roll-up industry, it is concluded that the number of promising mulberry types with the finest properties, should be increased and their cultivation should be popularized.
AtıfScopus3WoS3İncele - MakaleAçık Erişim2013Scopus SJRQ3Spaces of continuous and bounded functions over the field of geometric complex numbers
Cakir, Zafer
Following Grossman and Katz (Non-Newtonian Calculus, 1972), we construct the sets B(A) and C(A) of geometric complex-valued bounded and continuous functions, where A denotes the compact subset of the complex plane C. We show that the sets B(A) and C(A) of complex-valued bounded and continuous functions form a vector space with respect to the addition and scalar multiplication in the sense of multiplicative calculus. Finally, we prove that B(A) and C(A) are complete metric spaces.
AtıfScopus10WoS5OpenAlex9İncele - MakaleYalnız künye2013Scopus SJRQ3Ecological and economical advantages of solar water heating systems used by forest villagers in Gumushane, Turkey
Çakir, Günay
Clean and safety energies are crucial for our world energy requirements. Therefore, the environmental awareness on the topic will also increase the use of clean energy especially in rural and urban areas. A solar energy water heater solar system is one of the clean energy systems and has the best environmental impact in the region. This study concentrates on analyzing the solar energy heater systems having ecological impacts and economical advantages used by 891 single forest villagers in Gumushane province. Average energy saving were calculated for monthly and yearly for the families use solar heating water systems. Thus, we came to the conclusion of that it is highly important economically and ecologically having advantage of solar energy water heater systems for Gumushane province. The results of this study can be summarized as followings solar water heating systems; a) reduce the rate of burning wood and carbon emission, b) save 75 kW electric energy, c) total wood saved 1291.5 m3 and d) 1635 $/year for per forest villager house.
- MakaleAçık Erişim2013Scopus SJRQ2FDM for fractional parabolic equations with the Neumann condition
Ashyralyev, Allaberen; Cakir, Zafer
In the present study, the first and second order of accuracy stable difference schemes for the numerical solution of the initial boundary value problem for the fractional parabolic equation with the Neumann boundary condition are presented. Almost coercive stability estimates for the solution of these difference schemes are obtained. The method is illustrated by numerical examples.
AtıfScopus20WoS16OpenAlex20İncele - MakaleYalnız künye2013Scopus SJRQ3Molecular characterization of some Onobrychis species growing in the eastern Anatolia region of Turkey
Okcu, Melih; Sengul, Suleyman; Sunar, Serap; Agar, Guleray
In this study, we investigated interspecific variations in Sections Dendrobrychis, Hymenobrychis, Heliobrychis, Onobrychis of genus Onobrychis by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) technique and RAPD. Total eight species collected from different regions of Turkey were studied for the analysis of seed storage protein profiles and RAPD profile to examine their relationship. Electrophoretic data were documented by using a gel documentation system and analysed by using Quantity 1 -D analysis software and also the dendrogram was formed in UPGAMA. The sections Dendrobrychis, Heliobrychis, Hymenobrychis, Onobrychis of genus Onobrychis were firstly determined by morphological classification. In addition to RAPD and the seed protein of these species belonging to these sections were clustered together. The formed dendrogram from SDS-PAGE analysis showed that all studied species constituted two clusters. The first one consisted of O. huetiana subs. bornmuelleri, O. huetiana, O. montana, O. stenostachya and O. atropatana var. grandiflora and the second one O. viciifolia, O. hajastana and O. cornuta. The dendrogram realized from the RAPD markers grouped the Onobrychis spp. into three major clusters. Cluster 1 included O. huetiana subs. bornmuelleri, O. viciifolia, O. huetiana, O. atropatana var. grandiflora, O. montana and O. cornuta, Cluster 2 included O. stenostachya and Cluster 3 O. hajastana.
AtıfScopus2WoS2İncele - MakaleYalnız künye2013Scopus SJRQ1Petrogenesis and U-Pb zircon chronology of adakitic porphyries within the Kop ultramafic massif (Eastern Pontides Orogenic Belt, NE Turkey)
Eyuboglu, Yener; Dudas, Francis O.; Santosh, M.; Yi, Keewook; Kwon, Sanghoon; Akaryali, Enver
High-silica adakites intrude the Kop ultramafic massif in the eastern Pontide orogenic belt of NE Turkey. These dominantly dacitic to rhyodacitic plagioclase porphyries form clusters of small intrusions. U-Pb dating of zircons from two intrusions yields ages between 52 and 59 Ma. The best-constrained crystallization age is 55.83 +/- 0.04 Ma, indicating that these are the oldest adakitic rocks of the eastern Pontides. The rocks show geochemical signatures typical of adakites. The absence of systematic geochemical variation within the adakite suite indicates a subordinate role for fractional crystallization and binary mixing, and suggests that individual intrusions may represent separate, small batches of magma. Modeling of partial melting suggests that the degree of melting was 5-20%, that the residues after melting likely contained garnet, clinopyroxene, and rutile, and that plagioclase was either absent or totally consumed during partial melting. The most likely source compositions had large-ion lithophile elements >10 times, and heavy rare earth elements <10 times, chondritic concentrations. Modeled bulk distribution coefficients indicate that the adakites were generated as silicic magmas, and are not derived by fractional crystallization from basaltic or andesitic parental melts. Sr, Nd, and Pb isotopic data indicate at least three isotopically distinct sources, one of which is depleted mantle. The other components include upper crust (possibly a mixture of subducted sediment and Hercynian continental basement rocks) and a component that may include both lower crust and sublithospheric mantle. These adakites are unique among the late Cretaceous and Cenozoic igneous rocks of the eastern Pontides in having a large proportion of the depleted mantle component. The prominent role of the depleted mantle in their petrogenesis suggests that the adakites may be related to a slab window in a south-directed subduction zone. (C) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
AtıfScopus57WoS56OpenAlex59İncele - MakaleYalnız künye2013Scopus SJRQ1Physicochemical characteristics of a novel activated carbon produced from tea industry waste
Gundogdu, Ali; Duran, Celal; Senturk, H. Basri; Soylak, Mustafa; Imamoglu, Mustafa; Onal, Yunus
Tonnes of waste are generated during tea production in Turkey, one of the black tea producing countries in the world. These wastes are not used for any purposes throughout industrial sector. The objective of this study is to bring in economic value to waste materials by producing activated carbons from wastes of a tea plant and to characterize their physicochemical properties. Three types of activated carbons were produced by chemical activation using zinc chloride from tea industry wastes (TIW). Mesoporous structure and surface area rise as the ratio of ZnCl2/TIW increases. When the ratios of ZnCl2/TIW were selected as 1/2:1, 1:1, and 2:1, mesoporous activated carbons are found in the percentages of 10.9%, 39.9% and 77.7% with BET surface areas of 706, 1066 and 1141 m(2) g(-1), respectively. The resultant activated carbons were characterized by analyses of proximate-ultimate, FT-IR, SEM, TGA, methylene blue-iodine numbers, and surface functional groups. (C) 2013 Elsevier B.V. All rights reserved.
AtıfScopus198WoS173OpenAlex194İncele - MakaleYalnız künye2013Scopus SJRQ3Cadmium and nickel determinations in some food and water samples by the combination of carrier element-free coprecipitation and flame atomic absorption spectrometry
Bahadir, Zekeriyya; Ozdes, Duygu; Bulut, Volkan Numan; Duran, Celal; Elvan, Hamide; Bektas, Hakan; Soylak, Mustafa
A procedure for separation and enrichment of Cd(II) and Ni(II) ions based upon carrier element-free coprecipitation by using an organic coprecipitant, 2-{4-[2-(1H-Indol-3-yl)ethyl]-3-(4-methylbenzyl)-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl}-N-(3-fluoro-phenylmethyliden) acetohydrazide, prior to their flame atomic absorption spectrometric detections has been developed. The effects of varied experimental conditions on the performance of the developed method such as pH, sample volume, amount of coprecipitating agent, etc. were evaluated in detail on the recovery of analyte ions, and the influences of some anions and cations were investigated. The limits of detection for Cd(II) and Ni(II) ions based on three times the standard deviation of the blanks (N: 10) were obtained as 0.70 g L-1 and 1.21 g L-1, respectively. The accuracy of the method was tested by analyzing a certified reference material and by spike tests. The method was applied to determine the levels of cadmium and nickel in stream and sea water, rice, red lentil, and wheat samples.
AtıfScopus22WoS20OpenAlex21İncele