Yayınlar
Koleksiyondaki öğeler
- MakaleYalnız künye2016Scopus SJRQ3Optimization of Cadmium Removal from Water by Hydroxyapatite Using Experimental Design Methodology
Ince, Olcay Kaplan; Ince, Muharrem; Karaaslan, Nagihan M.; Yonten, Vahap
The presence of cadmium in water is a serious threat to the environment. The removal of cadmium using hydroxyapatite as an adsorbent was studied in an aqueous system. Hydroxyapatite was prepared to process the adsorption of cadmium from aqueous solution. Experimental design methodology and response surface methodology (RSM) with a quadratic model associated with central composite design was used to optimize the pH, initial heavy metal concentration, final volume, and adsorbent dosage for the removal of cadmium. Analysis of variance identified significant factors on each parameter. RSM indicated that a pH of 8.5, a sample volume of 166 mL, an adsorbent of dosage 0.57 g, and a contact time of 82 min were optimal for the adsorption of Cd(II). Under these conditions, the removal of Cd(II) was 895 mg g(-1).
AtıfWoS17OpenAlex15
İncele - MakaleAçık Erişim2018Scopus SJRQ3EFFECT OF POST-HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cu-Fe-Co POWDER ALLOY FABRICATED BY HOT PRESSING
Çelik, E.; Aslan, A. K.
In this study, the powder mixture which consists of Cu-Fe-Co was produced by using the method of hot pressing technique. In addition, effect of heat treatment process on microstructure and mechanical properties of this alloy was investigated. Following the hot pressing process applied on the samples, heat treatment was carried out at 950 degrees C for two different dwelling times (90 and 180 minutes). Measured density values were considered as physical characteristics, while hardness and fracture strength values were considered as mechanical characteristics. It was observed that porosity rates of hot pressed samples were decreased by increasing of temperature and pressing parameters. In this study it was observed that Cu was spread in matrix and filled the micro porosities. Hardness values were determined to be decreased as a result of grain growth after heat treatment process. That 4 fold increased elongation % values which were achieved by TRS experiments were observed as well.
AtıfWoS3OpenAlex2İncele - MakaleYalnız künye2020Scopus SJRQ3The Use of Astacus leptodactylus (Eschscholtz, 1823) as a Test Species for Toxicity Evaluation of Municipal Wastewater Treatment Plant Effluents
Yildirim, Cikcikoglu N.; Aksu, O.; Tatar, S.; Yildirim, N.
This study evaluated the responses of biochemical biomarkers in Astacus leptodactylus exposed to treated municipal effluents discharged into Keban Dam Lake, Elazig Elazig, Turkey. A. leptodatyclus were exposed to treated municipal effluents and Catalase (CAT), Superoxide dismutase (SOD) activity and lipid peroxidation (TBARS), glutathione (GSH) levels were measured as oxidative stress biomarkers. SOD activity was increased after exposing to treated municipal effluents for 24th and 96th h. CAT activities were decreased from 25.29 to 14.12 nmol/min/ml compared to control in the group exposed to treated municipal effluents for 24 h but it increased after 96 h exposure. GSH levels were decreased from 9.08 to 3.77 mu M compared to control, but MDA levels were increased both at 24 th h and 96 th h after exposure to treated municipal effluents. CAT, SOD activities and MDA and GSH levels in the hepatopancreas of A. leptodactylus are sensitive and suitable biochemical biomarkers for evaluating the toxicity of the treated municipal effluent complex mixtures. Treated municipal effluents exposure was found to cause sub-lethal responses in A. leptodactylus suggesting oxidative stress.
AtıfWoS2OpenAlex3İncele - MakaleYalnız künye2022APPLICATION OF RAINWATER HARVESTING TO MUNZUR UNIVERSITY CAMPUS AND EXAMINATION OF CONTRIBUTIONS
Korkmaz, Meral
The world is facing drought, and over time, water problems are becoming more serious. Agricultural land and green areas are gradually declining due to water scarcity. While the amount of available water is gradually decreasing, people's unnecessary use of water and water consumption are increasing. This, in turn, requires the accurate use of existing water resources and the realization of intelligent building systems as soon as possible. Despite this fact, none of the university's public buildings currently use systems such as the rainwater harvesting technique. The main aims of this research are to find effective results in terms of savings and to contribute to avoiding water shortages in the future. It is important today to immediately begin making future housing with these systems and to integrate these intelligent systems into public buildings, especially incorporating the latest technologies. In this study, the advantages of zero-energy built roofs and rainwater harvesting systems on the Munzur University campus are evaluated.
AtıfWoS1İncele - MakaleYalnız künye2016Scopus SJRQ3Efficiency of some soil bacteria for chemical oxygen demand reduction of synthetic chlorsulfuron solutions under agiated culture conditions
Erguven, G. O.; Yildirim, N.
This study searches the efficiency of certain soil bacteria on chemical oxygen demand (COD) reduction of synthetic chlorsulfuron solutions under agitated culture conditions. It also aims to determine the turbidity of liquid culture medium with chlorsulfuron during bacterial incubation for 120 hours. As a result the highest and lowest COD removal efficiency of bacteria was determined for Bacillus simplex as 94% and for Micrococcus luteus as 70%, respectively at the end of the 96th hour. It was found that COD removal efficiency showed certain differences depend on the bacterial species. It was also observed that B. simplex had the highest COD removal efficiency and it was a suitable bacterium species for bioremediation of a chlorsulfuron contaminated soils.
AtıfWoS24OpenAlex3
İncele - MakaleYalnız künye2017Scopus SJRQ1A food waste utilization study for removing lead(II) from drinks
Ince, Olcay Kaplan; Ince, Muharrem; Yonten, Vahap; Goksu, Ali
This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food waste, namely eggshell (hydroxyapatite) utilization, was used to remove Pb(II) from mineral water and energy drinks. Mineral water and energy drinks were chosen for removal of lead since the latter is severely hazardous to human health even in small amounts. Response Surface Methodology (RSM) was performed to optimize the application process by practice of the quadratic model united with the Central Composite Design (CCD) and quadratic combined program was utilized to study the most effective parameters on aforementioned liquids. Through the application of variance analysis (ANOVA) factors critical to removing of lead were identified for each experimental design response. Maximum adsorption capacity of eggshell was achieved as 923 mg g(-1) for Pb(II). The obtained optimum conditions were applied to drinks. Results showed that used adsorbent was quite effective in removing Pb(II) from drinks. (C) 2016 Elsevier Ltd. All rights reserved.
AtıfWoS27OpenAlex28İncele - MakaleAçık Erişim2017Scopus SJRQ3The Effect of Porosity and Cu Rate on Microstructure and Mechanical Properties of Co Alternative Powder Metallurgy Compound
Çelik, Ertugrul; Aslan, Ali Kemal
Cu-Ni-MX1480 powder compound were prepared at six different alloy ratios and cold pressed with a pressure of 300 MPa. Then 12 samples were obtained by hot pressing at 700 degrees C with 20 MPa pressure and at 800 degrees C with 30 MPa pressure for 4 minutes in a vacuum atmosphere hot pressing machine. Porosity ratios of samples were calculated by the different between theoretical density and measured density of samples. Effect of porosity on microstructure and mechanical properties were investigated by performing SEM, XRD, hardness measurements and TRS tests. It was observed that as a result of increased hot pressing parameters and increased Cu ratio, porosity ratio was decreased and better mechanical properties achieved.
AtıfWoS15OpenAlex14İncele - MakaleYalnız künye2011Scopus SJRQ3Use of Biochemical Markers in Capoeta trutta (Heckel, 1843) for the Assessment of Aquatic Pollution in Munzur River, Tunceli, Turkey
Yildirim, N. C.; Danabas, D.; Ergin, C.
The potential utility of biomarkers for monitoring both environmental quality and the health of organisms inhabiting polluted ecosystems has received increasing attention during the recent years. In this study. it was aimed to investigate the possible effect of pollution on biochemical parameters of Capoeta trutta captured in two environments with different levels of pollution in Munzur River, Tunceli, Turkey. One of them, hereby named reference site, there is no sewage discharge. Other side is denominated as polluted site is characterized by discharge of domestic sewage. Levels of amylase, alkaline phosphatase, lactate dehydrogenase, high-density lipoprotein cholesterol, cholesterol, albumin, total protein, direct bilirubin, total bilirubin, gamma-glutamyl tranferase, aspartate aminotransferase, alanine aminotransferase, urea, creatinine, glucose, triglycerides and uric acid were checked in blood samples. Plasma biochemical changes showed significantly differences between reference and polluted sites in alkaline phosphatase, lactate dehydrogenase, high-density lipoprotein cholesterol, cholesterol, alanine aminotransferase and glucose values. These results indicate that both domestic waste water and agricultural activities can alter the serum biochemical contents of Copeata trutta fish in Munzur River. Continuous production of pollutants resulting in impaired ability to respond to different environment stress factors and diseases. Present groups of researchers suggest that pollution levels should be monitored regularly.
AtıfWoS3İncele - MakaleYalnız künye2013Scopus SJRQ2Fault diagnosis system for series compensated transmission line based on wavelet transform and adaptive neuro-fuzzy inference system
Eristi, Huseyin
This paper proposes a new fault diagnosis approach based on combined wavelet transform and adaptive neuro-fuzzy inference system for fault section identification, classification and location in a series compensated transmission line. It performs an effective feature extraction approach based on norm entropy in order to obtain the features represented main frequency, harmonic and transient characteristics of the fault signals. The proposed method uses the samples of fault voltages and currents for one cycle duration from the inception of fault. The feasibility of the proposed method has been tested on a 400 kV, 300 km series compensated transmission line for all the ten types of faults using MATLAB/Simulink for a large data set of 23,436 fault cases comprising of all the 10 types of faults. Fault signals varying with fault resistance, fault inception angle, fault distance, load angle, percentage compensation level and source impedance are applied to the proposed algorithm. The results also indicate that the proposed method is robust to wide variation in system conditions and has higher fault diagnosis accuracy with regard to the other approaches in the literature for this problem. (C) 2012 Elsevier Ltd. All rights reserved.
AtıfWoS82OpenAlex101İncele - MakaleAçık Erişim2016Scopus SJRQ2Nickel, Lead, and Cadmium Removal Using a Low-Cost Adsorbent - Banana Peel
Ince, Muharrem; Ince, Olcay Kaplan; Yonten, Vahap; Karaaslan, Nagihan M.
Water pollution because of inorganic contaminants is a serious problem due to the acute toxicities and carcinogenic nature of pollutants. Recently, much attention has been focused on using natural and low-cost adsorbents, especially food residues, for removing toxic metal ions. Batch removal of nickel (Ni(II)), lead (Pb(II)), and cadmium (Cd(II)) from aqueous solution using a natural adsorbent is described in this study. Effects of various parameters on adsorption capacities such as pH, adsorbent dose, and stirring time were investigated by batch experiments. The maximum adsorption capacities for Ni(II), Pb(II), and Cd(II) ions were 1.6 mg g(-1), 125 mg g(-1), and 84 mg g(-1), respectively. Characterization of the surface modification was performed with FTIR measurements. FTIR spectra showed that chemisorption takes place at the surface of the adsorbent. The Freundlich and Langmuir adsorption isotherms were used to evaluate the equilibrium data. The characteristic parameters for each isotherm were determined. The Langmuir and Freundlich isotherm provided the best correlation for Ni(II), Cd(II), and Pb(II) using banana peel.
AtıfWoS10OpenAlex13İncele - MakaleYalnız künye2025The effect of electromagnetic fields on building materials: The case of base stations
Baran, Zeki; Polat, Alper
This study investigates the electromagnetic field (EMF) permeability characteristics of widely used construction materials to determine their effectiveness in electromagnetic insulation against radiation emitted by base stations. Field measurements were conducted at 81 base stations located in the city center of Diyarbak & imath;r in accordance with the standards of the Information and Communication metal, lead, PVC, XPS, and recycled concrete. The results indicate that the highest average electromagnetic field intensity was measured in free-space conditions (3.37 V/m), whereas lead exhibited the most effective shielding performance with an average value of 1.01 V/m, corresponding to an attenuation of approximately 70%. Metal sheets also showed strong shielding capability with an average value of 1.29 V/m. Among conventional materials, recycled concrete demonstrated lower electromagnetic permeability (2.13 V/m) compared to standard concrete (2.60 V/m). Thickness-dependent measurements revealed that increasing recycled concrete thickness from 3 cm to 7 cm reduced electromagnetic field intensity from up to 2.93 V/m to as low as 1.64 V/m, representing a reduction of approximately 44%. Measurements conducted inside and outside the safety distance further confirmed that EMF levels outside the safety distance can be more than twice those measured inside. Overall, the findings demonstrate that material type, thickness, and safety distance play a critical role in reducing electromagnetic exposure. Recycled concrete emerges as a sustainable and effective alternative for electromagnetic shielding in building design.
- MakaleYayıncıda açık erişim2010Scopus SJRQ3Milk Components from Machine Milking Cows in Winter and Spring Periods
Tekelioglu, O.; Cimen, M.; Soylu, D.; Soylu, I.
The aim of this study is to research the biochemical components in milks of machine milked cows for spring and winter season in different regions of Turkey. In study, all data were investigated for winter (December, January and February) and spring (March, April and May) periods in 2006. The milk fat levels were the highest in the winter season in Kayseri, Malya, Sahilkoy, Turhal and Pazar regions. The milk total solid levels were the lowest in the spring season for Kayseri Province. The milk sH values were the lower in the spring than winter season in Malya region. Whereas, there were no significant differences among regions for pH values in different periods. Low fat levels in total milk for spring period can cause to economical loss since the milk price depends on milk fat levels. Further studies are needed to investigate on milk components in different climatic conditions.
AtıfWoS3İncele - MakaleYalnız künye2013Scopus SJRQ3THE USE OF LIVER ANTIOXIDANT DEFENSE SYSTEM OF CAPOETA UMBLA (HECKEL, 1843) AS BIOMARKER FOR MONITORING IN WATER QUALITY OF UZUNCAYIR DAM LAKE, TUNCELI, TURKEY
Yildirim, N. C.; Ergin, C.
Domestic wastewaters of Tunceli, are directly discharged to Munzur and Pulumur Rivers without any pre-purification process. The purpose of this study is to reveal the size of pollution caused by domestic wastewaters together with natural contamination by the drainage area of the Pulumur and Munzur Rivers and to monitor physiological changes in fish captured from Uzuncayir Dam Lake. In fish samples, superoxide dismutase, catalase, glutathione peroxidase activities and levels of glutathione and malondialdehyde were determined. Our studies showed that the antioxidant system of Capoeta umbla could be used as biomarker of exposure to aquatic pollutants in Uzuncayir Dam Lake.
AtıfWoS3İncele - MakaleYalnız künye2014Scopus SJRQ3Electrical and Optical Properties of Titanium Dioxide-Carbon Nanotube Nanocomposites
Aydin, Handan
The electrical and optical properties of carbon nanotube and titanium dioxide nano-composites have been investigated. The carbon nanotubes were prepared by chemical vapor deposition. The diameters and lengths of the carbon nanotubes were respectively determined to be 20-30 nm and about 3-5 mu m by high resolution transmittance electron microscopy. The direct current electrical conductivity values sigma(dc) of the nanocomposites were found to be in the range of 5.96 x 10(-3)-0.47 S/cm. It was found that the electrical conductivity of nanocomposites increases with CNT content. The optical band gaps of the nanocomposites were determined by Kubelka-Munk theory based on the analysis of diffuse reflectance spectra. The band gap (E-g) values of the composites were decreased with increasing CNT contents. The obtained results indicate that the electrical and optical properties of TiO2 semiconductor metal oxide can be improved by incorporation of CNT content for electronic applications.
AtıfWoS6OpenAlex11İncele - MakaleAçık Erişim2014Scopus SJRQ3Comparision of Low-Cost and Eco-Friendly Adsorbent for Adsorption of Ni(II)
Ince, Muharrem
In this study, samples of clay, tea waste, astragalus plant, chestnut shell, and egg shell were used as low-cost and eco-friendly adsorbents for the adsorption of Ni(ID from aqueous solutions. The effect of various parameters such as pH, contact time, adsorbent dose, and final volume on the adsorption capacities of these natural adsorbents were investigated by batch experiments. The adsorption capacity for Ni(II) was found to be 19.4 mg g(-1), 5.4 mg g(-1) 1.3 mg g(-1), 5.6 mg g(-1), 72.0 mg g(-1) for clay, tea waste, astragalus plant, chestnut shell, and egg shell, respectively. Egg shell has maximum adsorption capacity at pH 12, 45-minute contact time, and 0.5 g adsorbent mass. Nickel-free and nickel-loaded adsorbents were characterized by FTIR spectroscopy, which evidenced the functional groups involved in nickel uptake. This work investigated the utilization of eco-friendly and low-cost adsorbents as an alternative natural adsorbent for Ni(II) ions.
AtıfWoS18OpenAlex14İncele - MakaleYalnız künye2016Scopus SJRQ4SCREENING OF TOTAL ANTIOXIDANT STATUS OF RICOTTA L. AND SOME GRAMMOSCIADIUM DC SPECIES FROM TURKEY
Yildirim, Nuran Cikcikoglu; Paksoy, Mehmet Yavuz; Yildirim, Numan; Yuce, Ebru
This study was aimed at screening the total antioxidant status (TAS) of genus Ricotta L. and some Grammosciadium L. from Turkey in order to find new potential sources of natural antioxidants. The TAS level of a total of 12 plant extracts from non-edible plant materials was examined. According to the results, hexanic extract of R. sinuata plant exhibited the lowest antioxidant status (2.41 mmol Trolox equivalent/l). The highest TAS level was determined in ethanolic extract of the G. daucoides (4.36 mmol Trolox equivalent/l). As a result, due to its antioxidative properties, ethanolic extract of G. daucoides can be utilized as a natural source of antioxidants.
- MakaleYalnız künye2014Scopus SJRQ3Assessment of immunomodulator biomarkers (Tnf-α, Il-1β and Il-6) in liver of Capoeta umbla for biomonitoring of pollution in Uzuncayir Dam Lake (Tunceli, Turkey)
Yildirim, N. C.; Danabas, S.
This study was aimed to monitor water pullution of Uzuncayir Dam Lake using the changes of IL-6, IL1 beta and TNF-alpha levels in Capoeta umbla (Heckel, 1843) liver tissue at ten stations in March and September 2011. In this study C. umbla (Heckel, 1843) was used as the indicator organism. Tumor necrosis factor-alpha (TNF-alpha), interlekuin1 beta (IL-1 beta) and interleukin-6 (IL-6) levels were determined in samples of the liver tissue by ELISA kit. The lowest mean IL-1 beta levels were found at station 6. The mean IL-1 beta was reached its maximum level at station 2. The difference between the mean levels of IL-6 was found to be significant (p<0.05) amoung stations. The IL-6 levels were significantly increased in September at stations 1, 2, 7 and 8 (p<0.01) compared to the values in March. The mean levels of TNF-alpha were found to be significant (p<0.05) amoung stations. The TNF-alpha levels significantly decreased in September at stations 1 and 9 (p<0.01). TNF-alpha, IL-1 beta and IL-6 levels in C. umbla can be used as early diagnostic indicators against adverse environmental events and useful and reliable bioindicators in determining the pollution of the aquatic ecosystem.
AtıfWoS16İncele - MakaleYalnız künye2021PHYLOGENETIC ANALYSIS OF WILD GROWS GANODERMA LUCIDUM IN TURKEY BASED ON THE ITS REGION OF RDNA AND OBTAINING HYBRID STRAINS BY PROTOPLAST FUSION METHOD
Kar, Bulent
Ganoderma is a cosmopolitan genus of fungi in many tree species. In this study, two wild Ganoderma lucidum strains that show the natural distribution in oak trees in the Mediterranean region (Alata and Balcali) were collected and their phylogenetic relationships based on the internal transcribed spacer rDNA region were defined and investigated. 3 equal phylogenetic trees were obtained using ITS sequences, the smallest of which was similar to 517 bp and the largest was similar to 836 bp, and the analysis of Maximum Likelihood (Kimura 2 and Tamura 3) and Maximum Parsimony (Bootstrap: 1000). G. lucidum strain in Turkey, unlike its European and Chinese relatives along with high bootstrap values (ML-K2P: 99%, ML-T2: 98%, and MP: 98%) they form a cluster with G. resinaceum. Moreover, results of phylogenetic analysis observing over 70% bootstrap (ML-K2P = 80%, ML-T3 = 79% and MP 86%) values of the G. lucidum samples in the study even among themselves creates an impression that these two strains arc a sub-strain of a new G. lucidum. RAPD method was used for molecular identification of hybrids acquired by protoplast regeneration. The difference between hybrid individuals was best identified as a result of RAPD analysis performed with primer no RAPD-GN X-17.
- MakaleAçık Erişim2013Scopus SJRQ2Chemical fingerprints of Raki: a traditional distilled alcoholic beverage
Gueven, Alper
Fourteen brands of commercial Raki samples were analysed chemically and compared with two samples produced in a local distillery, according to traditional methods, to determine whether the raw materials ( grape or raisin) and distillation practices result in distinguishable chemical fingerprints in the final product. The samples were analysed with respect to the content of trans- anethol, methyl alcohol, ethyl alcohol, higher alcohols and other volatiles, using gas chromatography. Principal component analysis showed that chemometric analysis could be used to distinguish between traditional and flavoured Raki products. Copyright (C) 2013 The Institute of Brewing & Distilling
AtıfWoS7OpenAlex11İncele - MakaleYalnız künye2014Scopus SJRQ3Evaluating Teachers' Views on the Impact of Appraisal and Feedback on Professional Development
Mentese, Sabit
The purpose of the present research paper is to determine the impact of feedback about appraisal on elementary teachers' professional development. The research was designed as a cross-sectional survey. The population comprised 165 elementary teachers working in primary schools in the central district of Tunceli during 2012-2013 school years. Population was not sampled, but accessed as much as possible. The data was collected using the Teaching and Learning International Survey (TALIS). The Cronbach Alpha reliability coefficient was 0.94. Validity studies were done based on expert opinion. The data was analysed using descriptive statistics, t and ANOVA tests. The results suggested that teachers are supervised and evaluated by the inspectors mostly outside the school; the feedback they receive are mostly about classroom practices. In terms of professional development this. feedback contributed mostly to classroom management practices.
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