Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(116)
- Şahin, Engin(48)
- Kaya, Yunus(46)
- Özen, Soner(46)
- İspirli, Hümeyra(45)
- Pat, Suat(44)
- Şenay, Volkan(42)
- Korkmaz, Şadan(36)
- Yilmaz, Mustafa Tahsin(33)
- Kutlu, Naciye(32)
- Cuce, Erdem(31)
- Öner, Erdal(31)
- Artar, Musa(30)
- Ertugrul, Mehmet(29)
- Hasar, Ugur Cem(29)
- Mercan, Emin(28)
- Bayraktar, Bülent(27)
- Bayram, Sinan(27)
- Can, Zehra(25)
- Ecem Bayram, Nesrin(25)
- Çolak, Murat(23)
- Özdemir, Akın(23)
- Cuce, Pinar Mert(22)
- Sert, Durmuş(22)
- Ayata, Ümit(21)
- Bayram, Ozkan(21)
- Dirican, Ebubekir(20)
- Abdioglu, Murat(19)
- Ayazoglu, Rabil(19)
- Birinci, Ahmet(19)
- Kamiloğlu, Aybike(19)
- Gerçek, Yusuf Can(18)
- Taylan, Osman(18)
- Tozlu, Alperen(18)
- Gul, Volkan(15)
- Hasar, Ugur C.(15)
- Kadakal, Mahir(15)
- Sagdic, Osman(15)
- Ergün, Mustafa(14)
- Kadakal, Huriye(14)
Yayınlar
- MakaleAçık Erişim2014DETERMINATION OF THE WEAR FAULT IN SPUR GEAR SYSTEM USING STATISTICAL PROCESS CONTROL METHOD
Maras, Sinan; Arslan, Hakan
Vibration analysis is one of the early warning methods widely used in obtaining information about faults occurring on the machine elements and structures. In this method, gear fault detection can be performed by analyzing of the vibration test results using signal processing, artificial intelligence and statistical analysis methods. The objective of this study is detection the existence of wear by examining changes in the vibrations of spur gears due to wear faults in statistical process control carts. In this study, artificial wear was created on the surfaces of spur gears in order to be examined in gears test rig. Then, these gears were attached and vibrations data were recorded by operating the system at various loading and number of cycles conditions. Detection of fault was demonstrated by analyzing undeformed and worn gears data in statistical process control carts by means of real-time experimental studies.
AtıfWoS1OpenAlex2
İncele - BildiriAçık Erişim2014Scopus SJRQ1The determination of antioxidative effect and anticancer potential of vulpinic acid
Anar, Mustafa; Kizil, Hamit Emre; Agar, Guleray
AtıfOpenAlex1İncele - BildiriAçık Erişim2014Scopus SJRQ1Cytotoxic and antiproliferative effects of evernic acid on HeLa cell lines: A candidate anticancer drug
Kizil, Hamit Emre; Agar, Guleray; Anar, Mustafa
AtıfWoS6OpenAlex10İncele - BildiriAçık Erişim2014Evaluation of Prospective Teachers and Practice Classroom Teachers Opinions of problems Encountered in Practice Schools (Bayburt University sample)
Öksüz, Yucel; Çevik, Ceren; Laborda, JC; Ozdamli, F; Maasoglu, Y
In this study, prospective teachers' and practice classroom teachers' opinions on the problems encountered during the schoolteaching practice class in the practice schools have been examined. The study has been conducted with 125 senior prospective teachers at B. U. Education Faculty, Primary Education, Primary School Teaching Department, and 21 practice classroom teachers that work at practice schools. The present study is case study, one of the qualitative researches. The data about the opinions of the prospective teachers and the practice classroom teachers were collected through the 'Interview form' developed by the researchers, and 'Practice Teacher Proficiency Scale' that was developed by Kiraz (2003) in order to find out the prospective teachers' views regarding the practice classroom teachers. Besides, 18 students who were willing have been interviewed. The data obtained out of the interview forms were analyzed with the help of descriptive statistics; the data obtained out of the interviews were analyzed with the help of qualitative data analysis techniques; and the data gathered out of the scale were analyzed with the help of SPSS 18.0 statistics packet. In line with the findings, some suggestions towards the classroom teaching education and the applications in primary schools have been presented. (C) 2013 The Authors. Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Academic World Education and Research Center.
AtıfWoS1OpenAlex4İncele - BildiriAçık Erişim2014The Comparison of The Wrestlers' Status of Some Physical, Physiological and Growth Hormone Status After Resting, Competition and Sauna Sessions
Kiyici, F.; Ucan, I.; Laborda, JC; Ozdamli, F; Maasoglu, Y
The aim of this study is to compare some of the physical, physiological, and growth hormone status during the resting, training and after the sauna sessions (80-100 degrees C and 10-15 % humidity) for wrestlers. Blood samples, for Growth Hormone (GH) were taken and stored during resting time, before breakfast in the morning, after training and the completion of sauna sessions. According to the results of the study; in body temperature and during resting and after training and sauna sessions (p<0.01), in the number of heart beats (NOV), both between resting status and training, sauna sessions and between training and sauna sessions (p<0.01), in reaction time (with right and left hand) both between resting status and training, and between training and sauna sessions (p<0.01), in GH both between resting time and sauna sessions, and between training and sauna sessions, results were stated statistically significant (p<0.01). (C) 2013 The Authors. Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Academic World Education and Research Center.
AtıfOpenAlex1İncele - BildiriAçık Erişim2014Developing a belief scale according to using computer technology in mathematics teaching
Yilmaz, Gul Kaleli; Besoluk, S
This study's aim is to develop a valid and reliable evaluation instrument to define the believes according to using technology in mathematical teaching. The sample is formed with 216 candidate teachers. While forming a scale those steps are followed having item tool, taking expert opinion, implementation, computing validity and reliability, finalizing the scale. At the end of the analysis scale is formed with 31 items, four factors and four factors' variance ratios are %44. Cronbach Alpha internal integrity coefficient is calculated as 0.895 for the whole scale. In line with findings the belief scale according to using computer technology in mathematics teaching is improved and it is decided as a valid and reliable evaluation instrument. (C) 2014 The Authors. Published by Elsevier Ltd.
AtıfWoS1OpenAlex2İncele - BildiriAçık Erişim2014Scopus SJRQ1Catalase positive cocci and volatile compounds in fermented sausages
Kamiloglu, Aybike; Sayin, Bilge; Kaban, Guzin; Kaya, Mukerrem
- BildiriAçık Erişim2014Scopus SJRQ1Probiotic meat products
Sayin, Bilge; Kamiloglu, Aybike; Kaya, Mukerrem; Kaban, Guzin
AtıfOpenAlex1İncele - MakaleAçık Erişim2014Production of pectin lyase from Geobacillus pallidus p26, purification, characterization and fruit juice application
Çelik, Safinur Yildirim; Demir, Nazan; Demir, Yasar; Adiguzel, Ahmet; Gulluce, Medine
A bacterial strain was isolated from Pasinler hot spring, Erzurum, Turkey. The purified thermophilic isolate was identified as Geobacillus pallidus P26 and used to produce extracellular pectin lyase (EC 4.2.2.10). Pectin lyase enzyme was purified 34 fold by using DEAE-cellulose anion exchange column chromatography and characterized. Molecular weight of the enzyme was determined as 56 kDa by using Sephadex G-100 gel filtration chromatography. Purification of enzyme was verified by SDS-PAGE. The pH- and temperature optima of enzyme were determined (pH 9.0 and 60 degrees C, respectively). Pectin lyase was mostly stable at 50 degrees C: for 24 hours. Its' activity ducruitscd to 50 % for 24 h at 60 degrees C. K-M and V-max were calculated as 24.8 mg/mL and 2.28 mu mol/L min, respectively. Purified pectin lyase was inhibited by Fe3+, Zn2+, Cu2+, Ca2+, Co2+ and Hg2+ but not by Mg2+. The purified pectin lyase enzyme was used for getting fruits juices. It was found that yields of fruits juices increased when they were compared with control.
AtıfWoS9OpenAlex9İncele - MakaleAçık Erişim2014Scopus SJRQ1Comparison between Analytical and ANSYS Calculations for a Receding Contact Problem
Yaylaci, Murat; Öner, Erdal; Birinci, Ahmet
This paper considers a receding contact problem for two elastic layers (with different elastic constants and heights) supported by two elastic quarter planes. The lower layer is supported by two elastic quarter planes, and the upper elastic layer is subjected to a symmetrical distributed load whose length is 2a on its top surface. It is assumed that contact between all surfaces is frictionless, and the effect of gravity force is neglected. First, the problem is formulated and solved using the theory of elasticity and integral transform technique. Using the integral transform technique and boundary conditions of the problem, the problem is reduced to a system of singular integral equations in which contact pressures and contact areas are unknown. The system of singular integral equations is solved numerically by using the Gauss-Jacobi integration formulation. Second, the receding contact problem has been developed based on the FEM ANSYS software. Two-dimensional analysis of the problem is carried out. The ANSYS and analytical results for the contact pressures, contact areas, and normal stresses (sigma(x) and sigma(y)) along the axis of symmetry are given for various dimensionless quantities. The ANSYS results are verified by comparison with analytical results. (C) 2014 American Society of Civil Engineers.
AtıfWoS50OpenAlex35İncele - BildiriAçık Erişim2014Investigation of Pre-service Science Teachers' Self-efficacy Beliefs of Science Teaching
Kahraman, Sakip; Yilmaz, Zeynel Abidin; Bayrak, Ramis; Gunes, Kubra; Ulvydiene, L; Rahimi, A
The scope of the study is to investigate the pre-service science teachers' self-efficacy beliefs of science teaching with respect to gender and grade level. Using the survey approach, the data of the study were gathered from 114 pre-service science teachers enrolled in the Faculty of Education at two universities in Turkey. The data was collected using a likert type scale, science teaching self-efficacy belief scale with 23 items, originally developed by Enochs-Riggs (1990). Variance analyses (two-way ANOVA) was performed on the collected data to reveal whether there are significant differences in science teacher candidates' self-efficacy beliefs of science teaching according to grade level and gender. The results of analysis showed that there was no statistically significant difference in pre-service science teachers' self-efficacy beliefs of science teaching with respect to both gender and grade level. (C) 2014 The Authors. Published by Elsevier Ltd.
AtıfWoS3OpenAlex16İncele - BildiriAçık Erişim2014Primary School Teacher Candidates' Offers to Primary School Students About Environmental Consciousness
Bozdemir, Hafife; Kodan, Hulya; Akdas, Hatice Betul; Uzunboylu, H
This study aims to determine the suggestions of primary school teaching final year students in regard to the introduction of environmental consciousness. A quantitative research approach was adopted in the present study conducted with 73 students receiving education at the Department of Primary School Teaching at Kastamonu University Faculty of Education. The data were collected by a semi-structured interview form developed by the researchers. The obtained data were presented in percentages and frequencies tables. The views of the fourth grade students of department of primary school teaching concerning the effective factors for introducing environmental consciousness, leading topics, methods and techniques to be used, assessment and evaluation techniques to be employed, activities, influential courses, sufficiency of subjects about environment in primary education curriculum, and whether there is a need for a separate environment course were determined. (C) 2014 Elsevier Ltd.
AtıfOpenAlex3İncele - MakaleAçık Erişim2014Scopus SJRQ2Assessment of kinetics, thermodynamics, and equilibrium parameters of Cu(II) adsorption onto Rosa canina seeds
Serencam, Huseyin; Ozdes, Duygu; Duran, Celal; Senturk, Hasan Basri
Rosa canina seeds (RCS) is considered as a low-cost and promising adsorbent in removal of metal ions; hence, in the present study, we aimed to test the adsorptive removal of Cu(II) ions from aqueous solutions by utilizing RCS in a batch process. After characterization of RCS by using several techniques, the effects of various experimental parameters such as initial pH of aqueous solution, contact time, initial Cu(II) concentration, RCS concentration, temperature, and electrolyte concentration were studied upon the adsorption process. The desorption conditions of Cu(II) ions from the loaded RCS were also evaluated. Maximum Cu(II) adsorption was found to occur at pH 6.0 and the equilibrium was established after 60 min of contact time. The adsorption isotherms were described by means of Langmuir, Freundlich, Temkin, and Dubinin Radushkevich models. The adsorption kinetics were analyzed using pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models and the adsorption data were well described by the pseudo-second-order model. Thermodynamic parameters such as the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) changes were also evaluated and it has been found that the adsorption process was feasible, spontaneous, and endothermic in the temperature range of 278-313 K.
AtıfScopus19WoS20OpenAlex19
İncele - MakaleAçık Erişim2014Scopus SJRQ2Two-step numerical procedure for complex permittivity retrieval of dielectric materials from reflection measurements
Hasar, Ugur Cem; Barroso, Joaquim José; Kaya, Yunus; Ertugrul, Mehmet; Bute, Musa; Catalá-Civera, José M.
A two-step measurement procedure has been proposed for measurement of complex permittivity of dielectric materials using one-port reflection measurements. In the procedure, as a first step, a graphical method is applied to analyze on the complex reflection-coefficient plane the general pattern of dielectric behavior of the sample. Then, as a second step, optimization algorithms are utilized for retrieving electrical properties of samples. The procedure requires measurement of complex reflection scattering parameters of at least two samples with different lengths. It has been validated by X-band measurements of three polyvinyl chloride samples with lengths 5, 10, and 20 mm.
AtıfScopus14WoS13OpenAlex15İncele - MakaleYalnız künye2014Scopus SJRQ2A comparative study of selected disperse azo dye derivatives based on spectroscopic (FT-IR, NMR and UV-Vis) and nonlinear optical behaviors
Cinar, Mehmet; Coruh, Ali; Karabacak, Mehmet
In the present work, a combined experimental and quantum chemical study on ground state equilibrium structure, spectroscopic and nonlinear optical properties of selected disperse azo dye molecules are reported. The vibrational transitions were identified based on the recorded FT-IR spectra in the range of 4000-400 cm-1 for solid state, simulated IR spectra and total energy distribution (TED) of vibrational modes. The chemical shifts were determined from the results of observed 1H and 13C NMR spectra in chloroform and dimethylsulfoxide solution. The DFT/gauge-invariant atomic orbital (GIAO) methodology was applied to predict the magnetic properties. Electronic properties were carried out by UV-Vis spectroscopy and TD-DFT/CIS approach. The nonlinear optical (NLO) features were addressed theoretically. A detailed description of spectroscopic and NLO behaviors of studied disperse azo dyes was reported with the help of comparison of experimental measurements and theoretical calculations.
AtıfScopus30WoS29OpenAlex29
İncele - MakaleYalnız künye2014Scopus SJRQ2Simple procedure for robust and accurate complex permittivity measurements of low-loss materials over a broad frequency band
Hasar, U.C.; Barroso, J.J.; Kaya, Y.; Bute, M.; Ertugrul, M.
In this research paper, we propose a simple procedure for accurate, stable and broadband measurements of complex permittivity of low-loss dielectric samples with considerable lengths. We identify and demonstrate by numerical and analytical analyses the main ill-behaved factor that gives rise to inaccurate peaks for measurements of electrical properties of low-loss samples in the well-known Nicolson-Ross-Weir method. Without using this factor in the expressions and combining better features of the methods available in the literature, the proposed procedure allows highly accurate permittivity measurements over a broad band. We have validated the proposed method by permittivity measurements of a low-loss sample by different methods.
AtıfScopus4WoS4OpenAlex3İncele - BildiriYalnız künye2014Scopus SJRQ1ZnO thin film synthesis by reactive radio frequency magnetron sputtering
Şenay, Volkan; Pat, Suat; Korkmaz, Şadan; Aydoʇmuş, Tuna; Elmas, Saliha; Özen, Soner; Ekem, Naci; Balbaʇ, M. Zafer
In this study, ZnO thin films were deposited on glass substrates by reactive RF magnetron sputtering method at argon-oxygen gas mixing (1:1) atmosphere. Some properties of the synthesized films were investigated by interferometry, UV-vis spectrophotometer, atomic force microscopy, and tensiometer. Tauc method was adopted to estimate the optical band gaps. The band gaps of the deposited films were affected by film thickness. We concluded that the surface composition plays a substantial role in the values of the band gaps. Nanocrystalline structures were detected in all produced samples.
AtıfScopus55WoS49İncele - MakaleAçık Erişim2014Scopus SJRQ2Effect of calcium channel blockers on paraoxonase-1 (PON1) activity and oxidative stress
Türkeş, Cüneyt; Söyüt, Hakan; Beydemir, Şükrü
Background: In this study, we investigated the in vitro effects of calcium channel blockers (nifedipine, nitrendipine, isradipine, and amlodipine besylate) on the activity of paraoxonase-1 (PON1). Methods: PON1 was purified from human serum using simple chromatographic methods, including DEAE-Sephadex anion-exchange and Sephadex G-200 gel filtration chromatography. Results: The calcium channel blockers decreased the in vitro PON1 activity. The inhibition mechanism of amlodipine besylate was noncompetitive, whereas nifedipine, nitrendipine, and isradipine were competitive inhibitors. Conclusions: Our results showed that calcium channel blockers exhibit inhibitory effects on PON1 at low concentrations. The IC50 values for nifedipine, nitrendipine, isradipine, and amlodipine besylate were determined to be 0.121 mM, 0.130 mM, 0.255 mM, and 0.304 mM, respectively, and the Ki constants were calculated to be 0.222 ± 0.049 mM, 0.151 ± 0.067 mM, 0.286 ± 0.137 mM, and 0.321 ± 0.002 mM, respectively.
AtıfScopus68WoS67OpenAlex74İncele - MakaleYalnız künye2014Scopus SJRQ2Synthesis and electrochemistry of metallophthalocyanines bearing {4-[(2E)-3-(3,4,5-trimethoxyphenyl)prop-2-enoyl]phenoxy} groups
Acar, Irfan; Arslan, Tayfun; Topçu, Saim; Aktaş, Ayşe; Şen, Serkan; Serencam, Hüseyin
In this study, metallophthalocyanines 4, 5, 6 was carried out by the cyclotetramerization of 4-{3-[(2E)-3-(3,4,5-trimethoxyphenyl)prop-2-enoyl] phenoxy}phthalonitrile 3. The synthesis of metallo derivatives [Zn(II), Co(II), Cu(II)] of phthalocyanines obtained from corresponding phthalonitrile derivative and in the presence of the anhydrous divalent metal salts (Zn(CH 3COO)2, CoCl2 and CuCl2) was described. These phthalocyanines showed good solubility in organic solvents such as chloroform, tetrahydrofuran, DMSO and DMF. The newly synthesized Pcs were verified by IR, 1H NMR, 13C NMR, UV-vis and MS spectral data. The electrochemical properties of the zinc(II), copper(II) and cobalt(II) phthalocyanines were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The cobalt complex showed a metal based reduction process, while zinc phthalocyanines were giving ligand based electron transfer processes.
AtıfScopus10WoS9OpenAlex12İncele - MakaleAçık Erişim2014Scopus SJRQ1Attractive method for thickness-independent permittivity measurements of solid dielectric materials
Hasar, Ugur Cem; Barroso, Joaquim José; Bute, Musa; Kaya, Yunus; Kocadagistan, Mustafa Engin; Ertugrul, Mehmet
We propose a non-resonant-type method for reference-plane invariant and thickness-independent permittivity measurement of solid dielectric materials when there is no information from permittivity. To achieve this, we derive a branch-index-independent function and verify that it determines the sample thickness and permittivity without resorting to finding the correct branch index value for three different measurement scenarios: (a) measurements at closely separated frequencies of non-dispersive samples, (b) measurements at largely separated frequencies of non-dispersive samples, and (c) measurements at largely separated frequencies of dispersive samples. Via a differential uncertainty analysis, the effect of inaccurate sample thickness on permittivity determination is also presented for demonstration of the improvement achieved by our method. For validation, we measured the permittivity of an approximately 20 mm PTFE sample using the presented method and compared its result with those from other similar methods. From the comparison, we note that the accuracy of tested methods from literature drastically decreases when accurate information of sample thickness is not known (in addition to a further decrease in accuracy when correct transformation factors from reference-planes are not known a priori), while the accuracy of our method is not influenced.
AtıfScopus25WoS22OpenAlex25İncele