Adapazar, Turkey
Adapazar, Turkey

Sakarya University is located in Sakarya, Turkey. It was founded as Sakarya Engineering and Architecture in 1970. It renamed as Sakarya State Engineering and Architecture Academy in 1971. It opened Master of Science and Doctorate of Philosophy programs in 1980. The programs were executed by İTÜ Institute of Pure and Applied science. It was bounded to İstanbul Technical University in 1982 as Sakarya Engineering Faculty in 1982. Vocational Schools of Sakarya and Düzce were bounded to her at same year. Finally It left from ITÜ and became Engineering Faculty of Sakarya University in 1992. Düzce Vocational School left from Sakarya Engineering Faculty and bounded to Abant Izzet Baysal University at same year. Wikipedia.

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Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: GC.NMP.2012-1 | Award Amount: 3.41M | Year: 2012

Electric car is considered as the most promising technical solution for automotive industries in 21st century since the use of electric energy not only slows down the petrol consumption but also contribute to reduce the CO2 emission and toxic air pollutants. Due to its good performance, Li-ion battery is generally studied to meet the above demands. However, it is still not satisfactory for long distance use because of its limited energy density. Therefore Li-air batteries have attracted worldwide attentions as an ideal alternative, because their outstanding energy density is extremely high compared to other rechargeable batteries. In this project, a multidisciplinary work team in materials synthesis and characterization, cell assembly and test will cooperate to perform a joint research to deliver a Li-air battery cell for EVs with high capacity and long cycle life in laboratory scale. This project focuses on innovations of battery anode, cathode, electrolyte materials and technologies, as well as assembly of batteries cells which are crucial on battery performance, cost and environmental impact. Improvement of lifetime and cyclability of Li-air batteries through finding highly active bifunctional catalysts to effectively regenerate batteries, protecting the Li anode from dendrites formation using suitable membranes and obtaining stable electrolyte with additives to render solubility of Li2O2 that blogs on cathode will be studied. Activities will focus especially on 1) optimization of cathode structures; 2) the selection of active catalysts and dehydration membranes; 3) modification of anode structure with necessary protecting layers, additives or surfactants; 4)modification of electrolyte properties. The final aim is to obtain Li-air battery cells with specific capacity of >2000mAh/g and an improvement of cycle life to 100-150 cycles.

Biochar is carbon-rich product generated from biomass through pyrolysis. In this study, the effects of pyrolysis temperature and heating rate on the yield and physicochemical and morphological properties of biochars obtained from safflower seed press cake were investigated. The results showed that the biochar yield and quality depend principally on the applied temperature where pyrolysis at 600°C leaves a biochar with higher fixed carbon content (80.70%) and percentage carbon (73.75%), and higher heating value (30.27MJkg-1) in comparison with the original feedstock (SPC) and low volatile matter content (9.80%). The biochars had low surface areas (1.89-4.23m2/g) and contained predominantly aromatic compounds. The biochar could be used for the production of activated carbon, in fuel applications, and water purification processes. © 2012 Elsevier Ltd.

Findik F.,Sakarya University
Materials and Design | Year: 2011

Explosion welding (EXW) is one of the joining methods consisting of a solid state welding process in which controlled explosive detonation on the surface of a metal. During the collision, a high velocity jet is produced to remove away the impurities on the metal surfaces. Flyer plate collides with base plate resulting in a bonding at the interface of metals. The metal plates are joined at an internal point under the influence of a very high pressure and causes considerable local plastic deformation at the interface in which metallurgical bonding occurs in nature and even stronger than the parent metals. Similar and dissimilar materials can be joined by explosive welding. In this paper, after detection the theories of welding and wave formation, experimental research and numerical studies on explosive welding are reviewed for the last four decades. Also, future developments in explosive welding are predicted and criticized in an outlook. © 2010 Elsevier Ltd.

Findik F.,Sakarya University
Materials and Design | Year: 2014

Wear is closely related to friction and lubrication; the study of these three subjects is known as tribology. In science and technology it is concerned with interacting surfaces in relative motion. Soft or hard film coating, alloying and composite structuring have all been developed to control wear and friction. This is achieved by improving materials and surfaces with some characteristics that improve resistance to friction and wear. In recent years, several new solid lubricant and modern lubrication concepts have been developed to achieve better lubricity and longer wear life in demanding tribological applications. Most of the traditional solid lubricants were prepared in the form of metal, ceramic and polymer-matrix composites. They have been used successfully in various engineering applications. Recent progress in thin-film deposition technologies has led to the synthesis of new generations of self-lubricating coatings with composite or multilayered architectures, by using multiplex surface treatments. In this study, typical wear behaviors of representative materials of metallic alloys, ceramics, polymeric materials, and composites are reviewed in relation to their friction behaviors. Additionally, modeling for the wear prediction is outlined. © 2013 Elsevier Ltd.

Yuksel I.,Sakarya University
Renewable Energy | Year: 2013

In the last decade, Turkish electricity demand has increased more than 8% per annum as a result of economic development. Being one of the renewable energy sources par excellence, non-exhaustible, non-polluting and economically more attractive than other renewable sources, hydropower has turned out to be an important contributor to the future energy mix of the country. Turkey's renewable energy sources especially hydropower sources are plentiful and extensive, and represent the second-largest domestic energy sources after coal. Turkey has a total gross hydropower potential of 433 TWh/year and 140 TWh/year of this capacity can be used economically. Currently, Turkey has 172 hydroelectric power plants in operation with total installed capacity of 13,700 MW generating an average of 48,000 GWh/year, which is 35% of the economically viable hydroelectric potential. 148 hydroelectric power plants are under construction 8,600 MW of installed capacity to generate average annual 20,000 GWh representing 14% of the economically viable potential. The share of renewables in total electricity generation is 17%, while that of thermal is 80% in 2009. The projection for the period 2010-2020 is for annual growth of 8% in total electricity generation. The additional generation capacity needed up to 2020 will require huge investments. This paper deals with present situation and future prospect of renewable energy and the role of hydropower in Turkey. © 2012 Elsevier Ltd.

A numerical technique is presented in order to assess formability conditions for tearing type sheet metal failures in automotive stamping applications. The proposed technique is based on the plastic instability and uses Swift's diffuse necking and Hill's localized necking concepts. Both necking models are transformed into a set of differential equations that may be applied both for proportional and non-proportional loadings and expressed an incremental form suitable for finite element (FE) analysis. Next, the numerical models are implemented into Ls-Dyna FE program and applied to predict the forming limit curve (FLC) of a high-strength dual-phase steel using in-plane proportional loadings of a single shell element. Then cup drawing processes of the same steel grade are simulated and failure heights for three square blanks are predicted. Allowable maximum punch strokes predicted with the necking models are compared with the results from {square cup} drawing tests under the same blankholder force. Model predictions were in accord with the experimental data and determined to be conservative for this steel grade. An investigation of cup failure heights determined with conventional technique revealed that the FE post-processing using the experimental FLC resulted in erroneous failure predictions and not conservative. © 2011 Elsevier Ltd.

Sumer M.,Sakarya University
Construction and Building Materials | Year: 2012

This paper presents the results of an experimental investigation carried out to evaluate compressive strength and sulfate resistance properties of concrete mixtures in which Turkish Class C and Class F fly ashes were partially replaced with cement. A total of 39 mixtures with different mix designs were prepared. Compressive strength tests were carried out and the mixtures with similar compressive strength values were used for sulfate resistance tests. The degree of sulfate attack was evaluated using expansion and weight loss tests. Compression test results indicate that the concrete mixture with Class C fly ash showed higher compressive strength than that with Class F fly ash. Moreover, regardless the fly ash type, the addition of fly ash significantly increased the resistance to sulfate attack. © 2012 Elsevier Ltd. All rights reserved.

The purpose of this study is to produce the low-cost activated carbon from the sour cherry (Prunus cerasus L.) stones, known as a waste of fruit juice industry, by chemical activation using zinc chloride. The effects of the activation temperature and the impregnation ratio on the surface and chemical properties of activated carbon were investigated. Also, the mathematical correlation between the activation process variables and outputs such as activated carbon yield and surface area were examined by using the Response surface methodology. The activation temperatures and impregnation ratios were selected at the range of 500-900 °C and 1:1-4:1, respectively. In the study, it was observed that the optimum conditions for the activated carbon production were activation temperature of 700 °C and impregnation ratio of 3:1. The optimum conditions resulted in an activated carbon with a carbon content of 80.78% and a yield of 16.22%, while the Brunauer-Emmett-Teller surface area evaluated using nitrogen adsorption isotherm corresponds to 1704 m2 g-1, with the total pore volume of 1.566 cm3 g -1. The activated carbon was het-eroporous with the micropore volume contributing to 62.84%. Also, experimental results showed that the activation temperature and the impregnation ratio have significant effects on the pore structure of the activated carbon and sour cherry stones seemed to be an alternative precursor for the commercial activated carbon productions. © 2013 Elsevier Ltd. All rights reserved.

Yuksel I.,Sakarya University
Renewable and Sustainable Energy Reviews | Year: 2010

Turkey has a total gross hydropower potential of 433 GWh/year, but only 125 GWh/year of the total hydroelectric potential of Turkey can be economically used. By the commissioning of new hydropower plants, which are under construction, 36% of the economically usable potential of the country would be tapped. Turkey presently has considerable renewable energy sources. The most important renewable sources are hydropower, biomass, geothermal, solar and wind. Turkey's geographical location has several advantages for extensive use of most of these renewable energy sources. Over the last two decades, global electricity production has more than doubled and electricity demand is rising rapidly around the world as economic development spreads to emerging economies. Not only has electricity demand increased significantly, it is the fastest growing end-use of energy. Therefore, technical, economic and environmental benefits of hydroelectric power make it an important contributor to the future world energy mix, particularly in the developing countries. © 2009.

Experimenal tests were investigated to evaluate the performance, emission and combustion of a diesel engine using neat rapeseed oil and its blends of 5%, 20% and 70%, and standard diesel fuel separately. The results indicate that the use of biodiesel produces lower smoke opacity (up to 60%), and higher brake specific fuel consumption (BSFC) (up to 11%) compared to diesel fuel. The measured CO emissions of B5 and B100 fuels were found to be 9% and 32% lower than that of the diesel fuel, respectively. The BSFC of biodiesel at the maximum torque and rated power conditions were found to be 8.5% and 8% higher than that of the diesel fuel, respectively. From the combustion analysis, it was found that ignition delay was shorter for neat rapeseed oil and its blends tested compared to that of standard diesel. The combustion characteristics of rapeseed oil and its diesel blends closely followed those of standard diesel. © 2009 Elsevier Ltd. All rights reserved.

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