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Balkesir, Turkey

Balıkesir University is a public university in Turkey. Wikipedia.

Demirtas M.,Balikesir University
Energy Conversion and Management | Year: 2011

In this paper, a new method of tuning Proportional Integral (PI) coefficients for a permanent magnet brushless DC (PMBLDC) motor drives is proposed. Artificial neural network is used to identify the whole system using maximum overshoot and settling time obtained from the application circuit for different Kp-Ki pairs. Optimal values of PI controller coefficients are obtained using genetic algorithm. Motion Control Kit (MCK243) is used to carry out digital motion control applications. The MCK243 kit includes a power module and a three-phase brushless motor. TMS320F243 programs are used for PMBLDC motor speed control. Experimental results are given to show the validity of this method. © 2010 Published by Elsevier Ltd. Source

This paper presents a novel approach to temperature probability density distribution and function. Probability density functions and frequency are successfully used in wind speed and solar energy analyses in literature. This study applies these data to temperature data analysis. The present model is developed using the indoor and outdoor temperature as a parameter. Outdoor temperature distribution is crucial for the calculation of monthly and total degree-hour. In this paper, using past weather data, the outdoor temperature probability density functions are modeled for four cities in different regions in Turkey via a new computer program. The main advantage of this approach is to allow us to determine heating and cooling loads with respect to different indoor and outdoor temperatures. © 2010 Elsevier Ltd. All rights reserved. Source

Kucukozer H.,Balikesir University
Computers and Education | Year: 2013

Abstract The purpose of this study was to investigate the long-term effectiveness of a three-dimensional (3D) computer modeling supported predict-observe-explain (POE) strategy on pre-service science teachers' understanding of lunar concepts. Thirty-three preservice teachers participated in the study. A questionnaire was used to assess participants' understanding of the phases of the Moon and eclipses before, after, and 22 months after the instruction. Semi-structured interviews were conducted with six participants before and after the instruction. The results demonstrated that few participants had a scientific understanding about the targeted lunar concepts before the instruction. However, the majority of the participants had a scientific understanding after the instruction indicating that the instructional intervention was quite effective in facilitating conceptual change. The results also demonstrated that twenty-two months after the instruction most participants maintained their scientific conceptual understanding suggesting that the powerful learning environment designed for this study was effective in promoting a durable conceptual change. © 2013 Elsevier Ltd. All rights reserved. Source

A simple, rapid, sensitive, and inexpensive dispersive liquid-liquid microextraction method was developed for the determination of trace amounts of copper by flame atomic absorption spectrometry (FAAS). N,N-bis-(2-hydroxy-5-bromobenzyl)-2-hydroxy-1,3-diiminopropane was used as the chelating ligand. Several analytical parameters affecting the microextraction efficiency such as, sample pH, volume of extraction solvent (carbon tetrachloride), concentrations of the chelating ligand and NaCl, and sample volume were investigated and optimized. The effect of the interfering ions on the recovery of copper was also examined. Under the optimum conditions, the detection limit (3σ) was 0.75 μg L-1 for copper with a sample volume of 10 mL, and a preconcentration factor of 20 was achieved. The relative standard deviation (R.S.D) for ten independent determinations of a 10 μg L-1 solution of Cu(II) was 2.3 %. In order to verify the accuracy of the developed method, different certified reference materials (SLRS-5, QCS-19, Rice flour unpolished high level of Cd NIES 10c) were analyzed and the results obtained were in good agreement with the certified values. The proposed method was applied to tap water, river water, seawater, rice flour, and wheat flour samples. The percentage recovery values for spiked water samples were between 95.4 and 108.4. © 2014 Springer International Publishing Switzerland. Source

Koc E.,Balikesir University
Journal of Travel and Tourism Marketing | Year: 2013

This study aims to explore gluttony as a liminoidal and inversionary form of behavior on all-inclusive holidays and its possible relationship with obesity. The study particularly looks at tourists' attitudes toward food and drinks on all-inclusive holidays, that is, whether they consume food and drinks excessively on holidays; and if they do, whether their excessive eating and drinking habits are continued after their all-inclusive holidays. The findings suggest that people who go on all-inclusive holidays consume more food and drinks (both in terms quantity and variety) and a significant proportion of them, though to a varying extent, continue their excessive consumption habits after their holidays. © 2013 Copyright Taylor and Francis Group, LLC. Source

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