Sürdürülebilir Kalkınma Amaçları
Yayınlar
- Conference ObjectAçık Erişim2015A design practice for interactive-direct teaching based on constructivist learning (IDTBCL): boiling and evaporation
Gurses, Ahmet; Gunes, Kubra; Dalga, Tuba; Dogar, Cetin; Alevriadou, A
In Interactive Direct Teaching Based on Constructivist Learning (IDTBCL), learning is evaluated as an oriented change or a mental passing from comprehending to understanding. The mental transition which will be actualized through the teaching activities in lesson practice of this approach includes creating the awareness of students related to the current concepts, creating a broad mental space including multiple conceptual parts, providing the adaptation of the new information to the previous knowledge through constant contextual communication, and harmonization. Misconceptions on Boiling and Evaporation are frequently encountered. In this study, fifty students studying at a state high school in province of Erzurum were chosen as the sample group. Half of the participants were determined as the control group and the rest as the experimental group. The implementation was performed as a quasi-experimental research design practice in the form of a control group pre-test post-test. A conceptual success test was administrated to the groups before the implementations as the pre-test. According to the results of pre-test, no significant difference between the groups was observed in terms of the conceptual success. After the teaching was accomplished by the same teacher in both groups, a significant difference was determined between the groups according to the post-test results and this difference was associated with the teacher's sense of learning. The significant positive change determined in the experimental group can be attributed to the positive attitude of the student towards this approach. (C) 2015 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - Conference ObjectAçık Erişim2015A Design Practice For Interactive- Direct Teaching Based On Constructivist Learning (IDTBCL): Dissolution And Solutions
Gurses, Ahmet; Demiray, Seher; Dogar, Cetin; Uzunboylu, H
In the interactive direct teaching based on constructivist learning (IDTBCL) is evaluated as a mental transition or an oriented change from understanding (two dimensions) to conception (three dimensions). This approach focuses on a conceptual structure. Dissolution and the solution are subjects of common misconceptions. Therefore, these concepts have been selected as reference ones for the design practice. In this study, participants are fifty students whose are attending at a high school in Turkey. The halves of participants are selected as experimental group and control group, respectively. Pretest-posttest with control group, which is the one of the quasi-experimental research design, was used for applications. In traditional group (control group), the same instructor used behaviorist approach, and the interactive direct instruction based on constructivist learning (IDTBCL) was done in experimental group during two weeks. Before applications, a conceptual test was administrated to the groups as a pretest. According to pretest results, there was no difference between the groups in terms of conceptual achievement. Although teaching in each group is performed by the same instructor, there is a significantly difference between groups related to the instructor's the mentality about learning. The significant positive difference in the experimental group can be attributed to the students' positive attitude toward to the conceptualization and the creation of three-dimensional mental space of the knowledge e.g. about the concepts dissolution and the solution concepts. Accordingly, it may be said that the model of interactive direct teaching-based constructivist learning (IDTBCL) of education in terms of the practice of teacher-centered active learning or meaningful learning can to be an extremely promising approach. (C) 2015 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - Conference ObjectAçık Erişim2015Teaching Of The Concept Of Enthalpy Using Problem Based Learning Approach
Gurses, Ahmet; Dogar, Cetin; Geyik, Esen; Alevriadou, A
The purpose of this research is to investigate the effect of the problem-based learning on students' academic achievement regarding to the concept of enthalpy, which is one of the most important in thermodynamics, and concepts of difficulty in teaching, and attitudes towards laboratory applications. The subjects were 31 third-year undergraduate students enrolled to a physical chemistry laboratory-I course in the Department of Chemistry Education in the spring semester of the 2011/12 academic year at Faculty of Education from a Turkish University. The students in groups of single and dual, every week of ten weeks for two groups participated of the same experimental study. The enthalpy concept test was administrated at the beginning and the end of each pre- and post-test experimental study and repeat the test was to determine the level of reliability and durability after treatment. Statistical analysis of experimental data, paired t-test was applied in the confidence interval of 0.05. At the end of the application of problem-based teaching model, the students' academic achievement gap between pre-test scores and post-test scores was found to be a statistical significant difference. (C) 2015 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - Conference ObjectAçık Erişim2015Determination Of Levels Of Use Of Basic Process Skills Of High School Students
Gürses, Ahmet; Çetinkaya, Songul; Dogar, Cetin; Sahin, Elif; Uzunboylu, H
It aims to determine the abilities of use of basic process skills of the students and the levels of conceptual learning of the students as oriented to general chemistry topics. The sampling comprises 160 students whose were studying at 10th and 11th grades of seven different high schools in Turkey. The study design is based on Survey model. The questionnaire prepared by considering the levels of conceptualization of chemistry topics of the students aims to measure their ability of use of science process skills. The questions and items were selected in the manner that it covers basic skills such as observation, classification, measurement, the sensing of space-time relationship and communicating, and also classified on the Bloom Taxonomy of cognitive development which consist of knowledge, comprehension, application, analysis, synthesis, and evaluation. The results from analysis of variance (ANOVA) show that. The differences between students' grade levels, score and order of admission to high school and the type of school have a significantly effect on the potential of use of basic process skills. (C) 2015 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - Conference ObjectAçık Erişim2015A New Approach for Learning: Interactive Direct Teaching Based Constructivist Learning (IDTBCL)
Gurses, Ahmet; Dogar, Cetin; Gunes, Kubra; Alevriadou, A
A world-wide formal teaching practice related with courses is almost entirely a teacher-led one. Therefore, main problem to be addressed is what will be learners' position in teacher-led applications. Also, a full constructivist change requires a more comprehensive change beyond the grasp of understanding. For this, it is tried to propose a novel model that depends on rearrangement of interactive direct teaching approach on the basis of the constructivist learning In this model named as Interactive Direct Teaching Based on Constructivist Learning (IDTBCL), learning is evaluated as a mental transition or an oriented change from understanding (two dimensions) to conceptualization or conception (three dimensions). In this study, participants are twenty five students whose are attending at Department of Chemistry Education at Ataturk University, in Erzurum, Turkey. Pretest-posttest with no control group, which is a pre-experimental research design, was applied for determining the effectiveness in practice of the model proposed. In Physical Chemistry course the interactive direct instruction based on constructivist was conducted during one term. Before applications, a conceptual questionnaire which contains 10 multiply-choose questions was administrated to this group as a pre-test. According to pretest results, there was no difference in group in terms of conceptual achievement. Although, after applications it was observed that there is a significant positive difference between pre-test and post-test results. This can be attributed to success of the model in terms of the conceptualization and the creation of three-dimensional mental space of the knowledge. (C) 2015 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - Conference ObjectAçık Erişim2014Analysis of the factors that influence the attitudes of elementary students for the internet
Dogar, Cetin; Kaplan, Mesut; Gürses, Ahmet; IIhan, AC; Miralay, F
It is important that the level of students' access to the internet in the information age. The purpose of this study is to determine certain variables of primary school students on their attitudes to the Internet. Working in the academic year 2011-2012 was made and research method is carried out by using survey method. The sampling consists of 272 elementary school students. Data was obtained by using Internet Attitude Scale (.874) of a 20-item and interpretative analysis were applied to the data. The results showed that preference of binding sites to the Internet, educational level, the Examination of Degree Identity(EDI), and gender aspects of the statistically significant differences on primary students' attitudes toward the Internet were found. (C) 2013 The Authors. Published by Elsevier Ltd.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2007Relations between hearing duration, sum of the monocular shifts of two eyes and nonverbal intelligence in university mathematics students
Dane, Arif; Dogar, Cetin; Dane, Senol
Objective: The aim of this study was to test the relations between the hearing duration of the right and left ears, the sum of the monocular shifts of two eyes and non-verbal intelligence. Material and Methods: The study group included 36 male and 34 female students of the Ataturk University, Faculty of Erzincan Education, Department of Mathematics. The hearing duration of the left ear was higher among left-handed students than in the right handed ones, and as the left ear hearing duration increased the non-verbal intelligence point increased also. Results: A significant negative relationship was found between the sum of the monocular shifts of the two eyes and non-verbal intelligence point. Non-verbal intelligence point was higher in the left-handed subjects than in the right-handed ones. Conclusion: In the light of these results, we may suggest that nonverbal intelligence is associated with hearing duration and the sum of the monocular shifts of the two eyes.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2005Removal of phenolic and lignin compounds from bleached kraft mill effluent by fly ash and sepiolite
Ugurlu, Mehmet; Gurses, Ahmet; Yalcin, Mehmet; Dogar, Cetin
This study aimed to remove phenolic and lignin compounds from paper mill industry (4500 m3/h) wastewaters, which is discharged to sea from a plant located in the western Turkey. As adsorbent, fly ash, raw sepiolite and heat-activated sepiolite were used. The effect of factors such as, particle size, temperature and pH on adsorption process was investigated. From kinetic studies, equilibrium time was found as 1 h for both. The kinetic data supports pseudo-second order model but shows very poor fit for pseudo-first order model. Intraparticle model also shows that there are two separate stages in sorption process, namely, external diffusion and pore diffusion. Adsorption isotherms for fly ash and activated sepiolite were obtained at two different temperatures. From experiments carried out at different pHs, it was observed that pH plays an important role in the adsorption process in removing of both lignin and phenolic compounds, providing both ionizating the compounds and modifying sorbent surfaces. It was also observed that heat-activated sepiolite is more effective than raw sepiolite and fly ash to remove these compounds. Adsorption of lignin and phenolic compounds increases with decreasing particle size. In addition, the efficiency of adsorption decreases with increasing adsorption temperature for both fly ash and untreated sepiolite.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2003The investigation of adsorption thermodynamics and mechanism of a cationic surfactant, CTAB, onto powdered active carbon
Gurses, Ahmet; Yalcin, Mehmet; Sozbilir, Mustafa; Dogar, Cetin
In this study, the adsorption mechanism of cethyltrimethylammonium bromide (CTAB), a cationic surfactant, onto powdered active carbon (PAC) from aqueous solution was investigated and also some thermodynamic quantities such as isosteric adsorption enthalpy and entropy for this system were determined. In addition, the mechanistic and thermodynamic results of the experiments were supported with the surface zeta potential measurements. It was found that 5 min is sufficient in order to reach adsorption equilibrium. The adsorption of CTAB onto active carbon/water interface mainly takes place through ion exchange, the ion pairing and hydrophobic bonding. The predominant mechanisms in the lower CTAB concentrations are probably ion exchange and ion pairing. The hydrophobic bonding mechanism predominates with the increasing CTAB concentration. It was determined that the signs of isosteric adsorption enthalpy (ΔHζ) and isosteric adsorption entropy (ΔSζ) for adsorption of CTAB onto PAC are negative and positive, respectively. As temperature increases, the amount of CTAB adsorbed is decreased indicating the exothermic nature of adsorption process. This decreasing verifies the negative sign expected of (ΔHads)ζ. As a result of the adsorption, since the number of the water molecules surrounding the hydrocarbon tails of CTAB molecules decreases and thus the degree of freedom of the water molecules increases, the positive sign of (ΔSads)ζ points out the hydrophobic bonding mechanisms.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2003Removal of Remazol red RB by using AI (III) as coagulant-flocculant: Effect of some variables on settling velocity
Gürses, Ahmet; Yalçin, Mehmet; Dogar, Cetin
This study addresses the research of the removal of a textile dye from aqueous solutions by using aluminum ions as coagulant-flocculant. A simulated textile wastewater was prepared from Remazol Red RB textile dye. The purpose of this study was to investigate the effects of temperature, pH, and concentrations of the cationic surfactant and electrolyte concentration on the settling velocity of the simulated textile wastewater. While investigating these factors, levels of variables were determined by considering the characteristics of traditional textile wastewater like pH, temperature, and dye concentration. Although traditional coagulation-flocculation processes make use of different aluminium salts as coagulant-flocculent, in this study, Al ions dissolved in pH and temperature of traditional textile wastewater were used. Furthermore, sludge volume index values (SVI) were determined and conductivity measurements carried out. The results showed that, in the working range of these variables, the spectroscopic color measurement revealed 100% decolorization yield of wastewater. In conclusion, researchers found that the optimum settling velocity conditions were as follows: low temperature (273K), surfactant concentration of 0.10 g L-1, electrolyte concentration of 0.10 g L-1, dye concentration of 0.025 g L-1 and a pH of 10.05. Finally, by conducting experiments twice under the obtained optimum values, mean settling velocity was 0.014 m min-1 and the mean sludge volume index 140 mL g-1.
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