Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(117)
- Kaya, Yunus(51)
- Şahin, Engin(48)
- İspirli, Hümeyra(47)
- Özen, Soner(46)
- Şenay, Volkan(45)
- Pat, Suat(44)
- Can, Zehra(39)
- Bayraktar, Bülent(37)
- Bayram, Sinan(37)
- Korkmaz, Şadan(36)
- Cuce, Erdem(35)
- Ecem Bayram, Nesrin(33)
- Kutlu, Naciye(33)
- Yilmaz, Mustafa Tahsin(32)
- Artar, Musa(31)
- Ertugrul, Mehmet(30)
- Öner, Erdal(30)
- Ayata, Ümit(29)
- Hasar, Ugur Cem(29)
- Esmer, Yusuf(28)
- Mercan, Emin(27)
- Cuce, Pinar Mert(26)
- Özdemir, Akın(25)
- Çolak, Murat(24)
- Bayram, Ozkan(23)
- Kamiloğlu, Aybike(23)
- Sert, Durmuş(22)
- Ayazoglu, Rabil(21)
- Abdioglu, Murat(20)
- Bayram, Nesrin Ecem(20)
- Kadakal, Mahir(20)
- Kara, Yakup(20)
- Kizil, Hamit Emre(20)
- Tozlu, Alperen(20)
- Birinci, Ahmet(19)
- Gerçek, Yusuf Can(19)
- Battal, Fetullah(18)
- Dirican, Ebubekir(18)
- Ergün, Mustafa(18)
Yayınlar
- MakaleYalnız künye2012Scopus SJRQ1A nondestructive testing technique: Nail penetration test
Selcuk, Levent; Gökce, H. Suleyman; Kayabali, Kamil; Simsek, Osman
This study presents a practical nondestructive testing (NDT) method: the nail penetration test (NPT). The major tools of the test technique are a gas nailer with 130 J (95.88 ft-lbf) power, concrete nails, and a gas nailer cell. The study covers three different limestone aggregate types. Six concrete mixtures were prepared from each aggregate type. Five nail shots were performed on each concrete mixture (or grade) and the average value was obtained. The average nail penetration depths were correlated with the compressive strength of concrete. Other NDT techniques, such as the Schmidt rebound hammer (SRH), ultrasonic pulse velocity (UPV), and Windsor probe (WP), were also applied to concrete samples. The measured compressive strength values were compared with those obtained from the empirical relationships using the data from the NPT, SRH, UPV, and WP. It was found that the reliability of the NPT to estimate the compressive strength of concrete is very high. The tool employed in the investigation covers a relatively wide range of compressive strength of concrete. This testing tool is proposed to estimate the compressive strength of in-place concrete.
AtıfScopus15
İncele - MakaleAçık Erişim2012Scopus SJRQ3Dynamic and interactive mathematics learning environments: The case of teaching the limit concept
Martinovic, Dragana; Karadag, Zekeriya
This theoretical study is an attempt to explore the potential of the dynamic and interactive mathematics learning environments (DIMLE) in relation to the technological pedagogical content knowledge (TPACK) framework. DIMLE are developed with intent to support learning mathematics through free exploration in a less constrained environment. A typical DIMLE software package has interactivity and dynamism as key affordances; these are especially suitable for enhancing learning and teaching with technology of the essentially dynamic mathematics concepts. Moreover, we propose that DIMLE and their affordances should be studied under the TPACK framework because this framework is explicit in considering technology-supported mathematics learning as a qualitative add-on as contrasted to what would be a simple totalling of technological, pedagogical and mathematical knowledge. As an example, we focus in our discussion on using a DIMLE in order to support learner in development of the limit concept.
AtıfScopus15OpenAlex29İncele - MakaleYalnız künye2012Scopus SJRQ3The use of the internet by pre-service teachers' for educational purposes
Kahraman, Sakip; Yalcin, Sema Altun; Erkol, Mehmet; Kisoglu, Mustafa
The aim of the research is to investigate why students at the Faculty of Education use the Internet. The sample of the study consisted of 348 students (178 female, 170 male) enrolled in the Faculty of Education at Bayburt University in Turkey. The data was collected using a survey which is consisted of seven questions developed by the researchers. The obtained data was statistically analyzed and responses given by students were calculated as frequency (f) and percent (%) values. The findings indicated that students frequently use the Internet for academic purposes, general subjects and communication. Additionally, it was determined that students use the Internet on average a few times per week both for academic purposes and general subjects. It was found that students mostly downloaded text material from the Internet while they were searching a subject. According to the results of the study students prefer to access Turkish web sites more than English web sites for academic purposes. It is held that students use the Internet more than library while they are searching for academic purposes. Furthermore, it is stated that nearly half of students believed that the Internet services can take the place of the libraries. At the same time, majority of the students believed that the internet improves students' achievement.
AtıfScopus2İncele - MakaleAçık Erişim2012Scopus SJRQ1Effect of ultrasound treatment on steady and dynamic shear properties of glucomannan based salep dispersions: Optimization of amplitude level, sonication time and temperature using response surface methodology
Karaman, Safa; Yilmaz, Mustafa Tahsin; Ertugay, Mustafa Fatih; Baslar, Mehmet; Kayacier, Ahmed
The present study investigated effect of different amplitude levels (40, 70 and 100%), sonication temperatures (40, 50 and 60 °C) and exposure times (3, 7 and 11 min) on steady shear properties; apparent viscosity (η), shear stress (σ), consistency coefficient (K), flow behavior index (n) and dynamic shear properties; storage modulus (G′), loss modulus (G″), complex viscosity (η), complex modulus (G) and loss tangent (tan δ) values of glucomannan based salep solution (SS) and salep drink (SD) samples. In addition, the steady and dynamic shear properties were optimized using ridge analysis in terms of amplitude level, sonication temperature and exposure times levels. Increasing amplitude level and sonication time decreased considerably the η, σ, K, G′, G″ and η values of salep dispersions (SS and SD samples). However, sonication temperature did not have a remarkable effect on these properties.
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İncele - BildiriYalnız künye2012Scopus SJRQ1The role of cogeneration systems in sustainability of energy
Çakir, Uǧur; Çomakli, Kemal; Yüksel, Fikret
Cogeneration system (CHP) is one of the ways to save the energy and use the energy efficiently. When compared to separate fossil-fired generation of heat and electricity, CHP may result in a consistent energy conservation (usually ranging from 10% to 30%) while the avoided CO 2 emissions are, as a first approximation, similar to the amount of energy saving. In terms of sustainability, one of the primary considerations is energy efficiency. Sustainable energy is considered as a kind of energy which is renewable and continuous, meaning that the use of such energy can potentially be kept up well into the future without causing harmful repercussions for future generations. In this study, environmental benefits and sustainability aspects of cogeneration systems and importance of those systems to the use of sustainable energy are underlined. To support this idea, first we have referred some scientific studies previously made on cogeneration systems and then we have used our own case study. The case study made on gas engined cogeneration system was applied for a hospital to show the sustainability aspects of cogeneration systems.
AtıfScopus115WoS97OpenAlex135İncele - Derleme MakaleYalnız künye2011An evalution on the early classification preriod of hadiths
Aydin, Nevzat
Bu araştırma, hadis tarihinin teşekkül dönemini oluşturan ve hadis edebiya- tının altın çağı olarak kabul edilen h.III. asrı hazırlayan ilk tasnif faaliyetle- rinin gerçekleştiği süreci, tarihî ve sosyo - kültürel bağlamlarını dikkate ala- rak bütüncül bir perspektifle yeniden okumayı amaçlamaktadır. Bu noktada ilk tasnif faaliyetinin tarihî seyri, ilk musannef eserlerin ortaya çıkış süreci, hadisleri tasnif mantığı ve özellikleri, ayrıca musannefleri isimlendirme problemi gibi konular ele alınıp değerlendirilmiştir. Esasen bu dönem üze- rine yapılan çalışmalar, özellikle tedvin ve tasnif hareketinin menşei ve ma- hiyeti hakkında yaşanan bir takım tartışmalara ışık tutacak niteliktedir.
AtıfTR Dizin5
İncele - BildiriYalnız künye2011WHO CAN UNDERSTAND THE GIFTED STUDENTS? A LESSON PLAN BASED ON HISTORY TO ENHANCE THE GIFTED STUDENTS' LEARNING
Ilhan, Ersin; Pytlak, M; Rowland, T; Swoboda, E
The need of gifted students of a deeper understanding of mathematics has lead to the enrichment programs. Al-Khwarizmi's work is used to develop a lesson plan aiming to create the appropriate atmosphere to help gifted students in a modern classroom understand the mathematics created by a gifted mathematician in the past. The objectives and the associated lesson plan developed by the author are suitable for implementation in Science and Art Centers which the gifted students in Turkiye attend after school.
- MakaleYalnız künye2011Scopus SJRQ2Statistical Downscaling of Monthly Precipitation Using NCEP/NCAR Reanalysis Data for Tahtali River Basin in Turkey
Fistikoglu, Okan; Okkan, Umut
Statistical downscaling methods describe a statistical relationship between large-scale atmospheric variables such as temperature, humidity, precipitation, etc., and local-scale meteorological variables like precipitation. This study examines the potential predictor variables selected from the National Center for Environmental Prediction and National Center for Atmospheric Research (NCEP/NCAR) reanalysis data set for downscaling monthly precipitation in Tahtali watershed in Turkey. An approach based on the assessment of all possible regression types was used to select the predictors among the NCEP reanalysis data set, and artificial neural network (ANN)-based downscaling models were designed separately for each station in the basin. The results of the study showed that precipitation, surface and sea level pressures, air temperatures at surface, 850-, 500-, and 200-hPa pressure levels, and geopotential heights at 850- and 200-hPa pressure levels are the most explanatory NCEP/NCAR parameters for the study area. It was concluded that ANN-based downscaling models can be implemented to downscale coarse-scale atmospheric parameters to monthly precipitation at station scale by using the above parameters as inputs in the study area.
AtıfWoS65OpenAlex86İncele - MakaleYalnız künye2011Scopus SJRQ1Opinions of prospective teachers about utilizing the 5E instructional model
Metin, Mustafa; Coskun, Kerem; Birisci, Salih; Yilmaz, Gül Kaleli
The aim of this study is to determine the opinions of prospective teachers about utilizing the 5E instructional model. The study was carried out during spring semester of 2008 educational periods. The sample of the study consisted of 60 sophomore prospective teachers at the Department of Primary Teacher Education in Faculty of Education at Artvin Çoruh University in Artvin. In the study, qualitative research method was used. This study was conducted in three stages. In the first stage, the prospective teachers were given national education standards which were about fourth and fifth class Science and Technology course and then they were asked to prepare an activity appropriate for the 5E instructional model. In the second stage, they were asked to carry out those activities into classroom. In the last stage, semi-structured interviews were followed up with the prospective teachers. The results of study revealed that the prospective teachers have positive opinions on applying of the 5E instructional model in classroom. They believe that the 5E instructional model provides the students to learn the topic. But the prospective teachers complained that insufficient learning materials and equipments which were needed for applying to the 5E model in classroom environment. In addition to these results, prospective teachers said that designing and implementing activities takes too much time when activity is practiced in classroom.
AtıfScopus11İncele - MakaleYalnız künye2011Scopus SJRQ1Modeling of triple concave friction pendulum bearings for seismic isolation of buildings
Yurdakul, Muhammet; Ates, Sevket
Seismic isolated building structures are examined in this study. The triple concave friction pendulum (TCFP) is used as a seismic isolation system which is easy to be manufactured and enduring more than traditional seismic isolation systems. In the TCFP, take advantage of weight which pendulum carrying and it's geometry in order to obtain desirable result of seismic isolation systems. These systems offer advantage to buildings which subject to severe earthquake. This is result of damping force of earthquake by means of their internal constructions, which consists of multiple surfaces. As the combinations of surfaces upon which sliding is occurring change, the stiffness and effective friction change accordingly. Additionally, the mentioned the TCFP is modeled as of a series arrangement of the three single concave friction pendulum (SCFP) bearings. A two dimensional- and eight- story of a building with and without isolation system are used in the time history analysis in order to investigate of the effectiveness of the seismic isolation systems on the buildings. Results are compared with each other to emphasize efficiency of the TCFP as a seismic isolation device against the other friction type isolation system like single and double concave surfaces. The values of the acceleration, floor displacement and isolator displacement obtained from the results by using different types of the isolation bearings are compared each other. As a result, the findings show that the TCFP bearings are more effective devices for isolation of the buildings against severe earthquakes.
AtıfScopus14OpenAlex12İncele - BildiriAçık Erişim2011The investigating pre-service teachers' learning styles with respect to the gender and grade level variables
Metin, Mustafa; Yilmaz, Gül Kaleli; Birişçi, Salih; Coşkun, Kerem; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C; Ozdamli, F
The aim of this study is to investigate pre-service teachers' learning styles in terms of gender and grade level variables. The study was carried out at spring semester of 2010. The sample of the study consisted of 347 pre-service teachers at the Department of Primary and Science Teacher Education in Faculty of Education at Artvin Çoruh University. "Kolb Learning Style Inventory" was used as a data collection tool. The data were analyzed by using frequency, percentage, means, standard deviation, independent samples t-test and one-way ANOVA. The results show that the dominant learning style among the students is accommodator and it is followed by convergent, divergent and assimilator learning style. There was not significantly difference between students' learning style and gender and between students' learning style and grade level.
AtıfScopus7WoS7OpenAlex16İncele - MakaleAçık Erişim2011Scopus SJRQ3The effects of silica fume and fly ash on the scaling resistance and flexural strength of pavement concretes
Yener, Engin; Hinislioğlu, Sinan
The purpose of this study is to investigate the effects of Silica Fume (SF) and Fly Ash (FA) additives on the frost salt scaling resistance and flexural strength properties of pavement concrete. An attempt is also made to attain a more durable and higher strength concrete by a suitable combination of Ordinary Portland Cement (OPC), SF and FA. SF and FA are used as cement replacement in proportions of 0, 5, 10% and 0, 5, 10, 15% by weight respectively. Flexural strength is tested after 7, 28 and 91 days of the lime saturated water curing period. The experimental results indicate that using FA only decreases while SF only slightly increases 28-days flexural strength. On the other hand, using SF and FA together shows relatively more strength gain. Among all those tested, maximum 28 days flexural strength of 4.53 MPa is obtained for the mix proportions of 85% OPC + 10% FA and 5% SF. SF significantly decreases the amount of liquid absorption by capillary suction and has a significant effect on the scaling resistance. In addition, all the ternary mixtures showes better scaling resistance than the control mixture with 100% OPC.
AtıfScopus9OpenAlex25İncele - MakaleAçık Erişim2011Scopus SJRQ2Airy's functions in nonlocal elasticity
Altan, Burhanettin S.
Nanostructured devices and materials, such as carbon nanotubes, Atomic Force Microscope, MEMS, etc. attract increasing attention in the scientific world. It has been realized that the classical elasticity is not capable to capture the mechanical behavior of them precisely. There is a wide consensus among the scientists that nonlocal elasticity is more capable than the classical counterpart to model the mechanical behavior of nanostructured materials and devices. In this paper a method which is useful for solving problems in nonlocal is introduced. Airy's stress functions for plane stress problems in nonlocal elasticity are studied. The nonlocal constitutive equations in integral form are discussed and a method is suggested to invert the constitutive equation which allows expressing strains in terms of stresses. A qualitative discussion is given on this inversion process. For the nonlocality kernel of exponential form, the differential equation for Airy's functions in nonlocal elasticity is obtained by introducing the strains into the compatibility condition. Appropriate polynomial forms for the Airy's function are considered and are applied to solve beam bending problems. The solutions are compared with their classical counterparts. The results are given in a series of figures and tables and are discussed in detail. This paper is concluded by indicating the implications of the presented study in nanomechanics and nanotechnology.
AtıfScopus1OpenAlex1İncele - MakaleYalnız künye2011Scopus SJRQ1Synthesis of sterically constrained tricyclic pyrrolidinyl alcohol ligands for the enantioselective ethylation of aryl aldehydes: Assessment of the influence of ring strain and N-alkyl chain length on asymmetric induction
Sahin, Engin; Kilic, Hamdullah
A series of chiral sterically constrained tricyclic pyrrolidinyl alcohol ligands were synthesized from the appropriate amino acids, and a comparative study of the activity and selectivity of the ligands for the enantioselective ethylation of aromatic aldehydes was carried out. The results obtained were compared with those previously reported for related monocyclic analogues; it was found that the bicyclo[2.2.2]octane backbone fused to pyrrolidine and the groups attached to the carbinol centre, as well as the chain length of the β-amino alcohol, had a marked effect on the enantioselectivity. The enantioselective addition of dialkylzincs to aryl aldehydes in the presence of ligands with diethyl substituents on the carbinol carbon afforded (R)-sec-alcohols in up to 99% enantiomeric excess (ee).
AtıfScopus5WoS5OpenAlex7İncele - BildiriAçık Erişim2011Mathematics teachers' views about measurement and evaluation dimension of new Turkish geometry curriculum
Yilmaz, Gül Kaleli; Alkan, Sevilay; Baran, Demet; Elmas, Hülya; Güven, Bülent; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C
The aim of this study is to investigate mathematics teachers' views about measurement-evaluation dimension of new Turkish geometry curriculum. With this aim, 15 mathematics teachers who are selected from Artvin, Bayburt, Rize and Trabzon were carried out semi-structured interview. As a result, it was seen that teachers in our samples tend to apply traditional measurement and evaluation approach as they find the new measurement-evaluation dimension difficult and uneasy using the tools and methods. And the teachers are not aware of which tools are to be used in alternative measurement and evaluation approach or they do not know how to use it. Also, there are teachers who have negative views about new approach. These teachers have stated the main issue occurs due to time limitations, crowded classes, lack of tools and materials and density of class hours.
AtıfScopus1WoS1OpenAlex3İncele - BildiriAçık Erişim2011Primary school teachers of instructional technologies self-efficacy levels
Yalcin, Sema Altun; Kahraman, Sakip; Yilmaz, Zeynel Abidin
In this research, the level of primary school teachers self efficacy believes towards instructional technologies is investigated. The research is performed by applying questionnaires to 43 primary school teachers in Erzincan. The questionnaire consists of 28 questions. For the analysis of the research results SPSS program is used, mean and standard deviation for the answers of all lecturers in the research are calculated. Result of this study is concluded that primary school teachers have high self efficacy believe towards instructional technologies. And teachers believe that they have an understanding of how technology can be integrated into regular classroom instructional practices.
AtıfScopus9OpenAlex17İncele - MakaleYalnız künye2011Scopus SJRQ1A Taguchi approach for optimization of design parameters in a tube with coiled wire inserts
Gunes, Sibel; Manay, Eyuphan; Senyigit, Ercan; Ozceyhan, Veysel
This study presents the determination of the optimum values of the design parameters in a tube with equilateral triangular cross-sectioned coiled wire inserts. The effects of the design parameters such as the ratio of the distance between the coiled wire and test tube wall to tube diameter (s/D), pitch ratio (P/D), ratio of the side length of equilateral triangle to tube diameter (a/D) and Reynolds number (Re) on heat transfer and pressure drop were investigated by using Taguchi method. The Nusselt number and friction factor were considered as performance parameters. An L9(34) orthogonal array was chosen as experimental plan. The goal of this study is to reach maximum heat transfer (i.e. Nusselt number) and minimum pressure drop (i.e. friction factor). First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals. Contribution ratios for each parameter on the heat transfer and pressure drop were determined. Consequently, the optimum results were found to be s/D = 0.0357, P/D = 1, a/D = 0.0714 and Re = 19800.
AtıfScopus115WoS100OpenAlex113İncele - MakaleYalnız künye2011Scopus SJRQ1A new energy saving for the determination of mixing temperature in hot mix asphalts
Yener, Engin; Hinislioglu, Sinan
The equi-viscous temperature range of asphalt has long been used in establishing the mixing temperature for mix designs and field production of hot mix asphalt (HMA). However, this method considers only binder viscosity to determine the mixing temperatures of the aggregate and asphalt. It is well known that depending on the gradation of aggregate and the type of plant and the mixing time. The appropriate mixing temperature for the proper coating may be lower than that of the viscosity based method. The excessive temperature causes the possible performance problems related to the hardening of the asphalt binder and increases the energy consumption, the gas emissions and fumes. In this study, a new method for the determination of asphalt-aggregate mixing temperature which considers the mixture properties was introduced to asphalt industry. The mixing temperatures of different nine mixtures were determined by both conventional and the proposed method. The effects of the nominal maximum aggregate size (NMAS), crushed coarse aggregate ratio (CCAR), the type of gradation, and the grade of binder on the mixing temperature were evaluated with an experimental study. Results show that decreasing NMAS, CCAR and increasing the grade of binder decreased the mixing temperature which is needed for proper coating. In addition, results showed that as going away from restricted zone of the Superpave gradation, the needed temperature to coat the aggregates decreased. The proposed method resulted in lower temperatures comparing to the conventional method on an average of 13°C. This means a possible energy saving of 14.3 x 10 9 kcal or 1362000 kg of crude oil in a year in Turkey. As a result, the new method is recommended due to not only the saving in energy but also decreasing the gas emissions and fume, and possible performance benefits.
AtıfScopus16İncele - MakaleAçık Erişim2011Scopus SJRQ1Effect of photosonication treatment on inactivation of total and coliform bacteria in milk
Şengül, Mustafa; Erkaya, Tuba; Başlar, Mehmet; Ertugay, M. Fatih
The combined effect of simultaneously applied acoustic energy and ultraviolet irradiation (UV-C), named photosonication, on the population reduction of total and coliform bacteria in raw milk was investigated. Photosonication was carried out at 100% (120 μm; 240 W) amplitude of ultrasound accompanied by UV light of 13.2 W cm-2 while sonication was carried out at 100% amplitude without UV light. An ultrasonic processor (400 W and 24 kHz with a 22 mm diameter probe) and 3 ultraviolet lamps (4400 μW cm-2 per lamp) were used. The exposure time was 15 min for all treatment, and samples were taken after 0, 3, 6, 9, 12 and 15 min. Thermal treatment (at 65 °C for 30 min) achieved a 3.29 log and 5.31 log-reduction for total and coliform bacteria, respectively. However, the reduction achieved was 4.79 log cfu mL-1 and 5.31 log cfu mL-1 for total and coliform bacteria, respectively, in photosonication while 1.31 log cfu mL-1 and 4.01 log cfu mL-1 for total and coliform bacteria, respectively in sonication. During photosonication, UV light contributed to an increase of lethality.
AtıfScopus33WoS32OpenAlex39İncele - MakaleYalnız künye2011Scopus SJRQ1The investigating high school students' learning styles with respect to the different variables: A sample from Turkey
Metin, Mustafa; Yilmaz, Gul Kaleli; Birisci, Salih; Coskun, Kerem
The aim of this study is to investigate high school students' learning styles in terms of gender, grade level, type of school, graduation type of mother and father variables. The study was carried out at spring semester of 2010 with 660 high school students who were chosen as a sample from the cities of Artvin and Trabzon, in Turkey. "Kolb Learning Style Inventory" was used as a data collection tool. The inventory was used to determinate the students' learning styles as divergent, assimilator, convergent, and accommodator and the information sheet for demographic factors such as gender, grade level, school type, education of mother and father was used to collect information from students. The data were analyzed by using frequency, percent value, mean scores, standard deviation, independent samples t-test and one-way ANOVA. The results show that the dominant learning style among the students is accommodator and it is followed by divergent learning style. There was not significantly difference between students' learning style and gender except for "Active Experimentation (AE) and AE-RO", grade level "except for Concrete Experience (CE)", school type, education of mother "expert for Reflective Observation (RO)" and education of father.
AtıfScopus13İncele