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Ankara, Turkey

Gazi University is a public university primarily located in Ankara, Turkey.It was established in 1926 by Mustafa Kemal Atatürk as Gazi Teacher Training Institute. In 1982, it was reorganized by merging with the Bolu Academy of Engineering and Architecture, Ankara Academy of Economics and Commercial science, the Ankara College of Technical Careers, the Ankara Girls' College of Technical Careers, and the Ankara State Academy of Engineering and Architecture to become a large metropolitan university as part of the act which created the Board of Higher Education. Prior to 1982 when the Board of Higher Education Law came into effect, institutes of higher education in Turkey were organized under different structures as universities, academies, institutes, and schools. In 1992 faculties and vocational schools in Bolu became Abant Izzet Baysal University.Gazi University comprises 21 faculties, 4 schools, 11 vocational schools of higher education, 48 research centers and 7 graduate institutes. The student enrollment of Gazi University has reached approximately 77,000 in total of whom about 1,500 come from the Turkic states of Central Asia. Five thousand students are enrolled in graduate programmes. The total size of the teaching faculty exceeds 3,000 persons. Wikipedia.

Turker A.R.,Gazi University
Separation and Purification Reviews

This review presents the most recent applications of solid phase extraction for the separation, preconcentration and speciation of metals, metalloids, and organometals. The review focuses on solid phase, column treatments and on the applications of this technique to various samples. This review also intends to discuss some applications and limitations associated to solid phase extraction techniques due to the necessity on limited selectivity. Nevertheless, the solid phase extraction is still an efficient, sensitive and inexpensive technique to perform removal of metal ions from environmental samples, preconcentration of metal ions for analytical purposes and speciation of the metal and metalloids as shown by the variety of applications presented and discussed in this review. A literature survey of the last three years (2008-2010) offering a critical review of solid phase extraction for separation, preconcentration and speciation of metal ions from various sample matrices is provided. © 2012 Copyright Taylor and Francis Group, LLC. Source

Arikan F.,Gazi University
Expert Systems with Applications

In today's severe competitive environment the selection of appropriate suppliers is a significantly important decision for effective supply chain management. Appropriate suppliers reduce purchasing costs, decrease production lead time, increase customer satisfaction and strengthen corporate competitiveness. In this study a multiple sourcing supplier selection problem is considered as a multi objective linear programming problem. Three objective functions are minimization of costs, maximization of quality and maximization of on-time delivery respectively. In order to solve the problem, a fuzzy mathematical model and a novel solution approach are proposed to satisfy the decision maker's aspirations for fuzzy goals. The proposed approach can be efficiently used to obtain non-dominated solutions. A numerical example is given to illustrate how the approach is utilized. © 2012 Elsevier Ltd. All rights reserved. Source

Sevik S.,Gazi University
Energy Conversion and Management

In this experimental study, a new type solar dryer has been designed and manufactured by using double-pass solar air collector, heat pump and photovoltaic unit. The performance of solar dryer has been tested for carrot drying. In drying system, double-pass solar air collector (DPSAC) has provided the system heat energy requirement for drying process. Constant drying air temperature has been provided with PID (proportional-integral-derivative) control. Carrot slices were dried from initial moisture content 7.76 g water/g dry matter (dry basis) to final moisture content 0.1 g water/g dry matter (dry basis) at 50 °C drying air temperature and variable air volume. Velocity of air has been changed depending upon air inlet temperature of drying cabinet. During the drying operation, the air velocity was measured 0.4-0.9 m/s. The thermal efficiency of the double-pass collector was calculated from 60% to 78% according to experimental results. Carrot slices were dried at 220 min by using double-pass solar air collector in solar-heat pump dryer. Consequently, system (solar-heat pump dryer) can be comfortably operated without the need to the heat pump under normal ambient air conditions.© 2013 Elsevier Ltd. All rights reserved. Source

Cakir H.,Gazi University
Computers and Education

Web 2.0 technologies allow average computer users to be able to publish on the Internet without having to know complex computer technical knowledge, which gives these technologies powerful potential to facilitate student engagement in various learning environments. However, a knowledge gap exists in the literature related to factors affecting student engagement with Web 2.0 technologies. The purpose of this study is to understand factors affecting student engagement in a pre-service teacher education program that uses blogs to expand in-class discussions about technology integration. First year pre-service teachers in a mathematics education department participated in the study. Data were collected with a survey that was developed to measure student engagement with blog use. Results show that student motivation, reasons to use blog in the course, and level of challenge perceived by the students affect students' engagement with blog use. Gender and technical ability of students do not impact students' engagement. As a result, blogs can be utilized to expand in-class discussions equally well for all students. © 2013 Elsevier Ltd. All rights reserved. Source

Sahin R.,Gazi University
Expert Systems with Applications

In this article, a bi-objective facility layout problem (BOFLP) is considered by combining the objectives of minimization of the total material handling cost (quantitative) and the maximization of total closeness rating scores (qualitative), with the predetermined weights are assigned to the respective objectives. A simulated annealing (SA) algorithm is proposed to solve the BOFLP, as well as a comparison of SA with the previous works is provided. It is shown that the SA algorithm works better than the previous works; thus proving the fact that the proposed SA algorithm is an efficient method for solving BOFLP. © 2010 Elsevier Ltd. All rights reserved. Source

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