Iskenderun Technical University

İskenderun, Turkey

Iskenderun Technical University

İskenderun, Turkey
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Turan C.,Iskenderun Technical University
Biochemical Systematics and Ecology | Year: 2015

Microsatellites were used to investigate population genetic structure of Atlantic bonito Sarda sarda from the Black Sea, Marmara Sea, Aegean Sea, north-eastern Mediterranean Sea and Adriatic Sea. Overall average observed heterozygosity was high (0.93). Average observed heterozygosity per locus ranged from 0.79 to 0.98. Pairwise FST estimates for all loci between populations ranged from 0 to 0.07626, and significant FST values (P < 0.001) were detected between populations; the Blacks Sea and Marmara Sea samples were not significantly different from each other, but significant different from the other samples, and Aegean Sea and north-eastern Mediterranean Sea samples were also not significantly different from each other, but significantly different from all other samples. The Adriatic Sea sample was significant different from all other samples. The Mantel test revealed a significant (P < 0.001, r = 0.68) isolation-by-distance for these 11 populations. Neighbour-joining analysis clustered the Black Sea and Marmara Sea samples together while collections from Aegean Sea and north-eastern Mediterranean Sea were clustered close to each other and far from the others. On the other hand, the Adriatic Sea collection presented very distinctive relationship from the others. © 2015 Elsevier Ltd.


Yapici A.,Iskenderun Technical University | Saracoglu G.,Iskenderun Technical University
Engineering Failure Analysis | Year: 2016

This paper describes the fatigue failure of a rotary dryer in a chemical plant. The process conditions required the dryer to be rotated continuously at a speed of about two and half revolutions per minute. The shell structure of this large drum is formed by combining segmented shell parts using bolted ring flange joints. Because of the gross weight of the dryer in operation time, each joint was subjected to bending moment. In the first two years in service, micro cracks were occurred by fatigue. The failure was analyzed using the fatigue curves given in ASME Boiler and Pressure Vessel Code Section VIII Division 2 and EN 13445 Unfired Pressure Vessels Part 3 Codes. Finally, flange joints were removed from the drum and new cylindrical parts adapted to the drum using butt welding after reaching better results in FEM and fatigue calculation. © 2016 Elsevier Inc.


Bikce M.,Iskenderun Technical University
Natural Hazards | Year: 2016

Considering the possibility of the reoccurrence of the earthquakes in which loss of life and property have accrued, the possibility of future losses can be minimized. In Turkey, although the information about the fatalities and damaged buildings might be contrived in the resources, those have limited information and contain substantial differences. Moreover, that information might not be presented in a common database. Some information presented by Turkey Prime Ministry Disaster & Emergency Management Authority, Kandilli Observatory and Earthquake Research Institute and United States Geological Survey is inconsistent not only in the number of earthquakes, fatalities, damaged buildings, the magnitude and intensity of earthquakes, but also at the date of the same earthquake. In this study, first, the resources providing the data regarding the earthquakes causing fatalities and damage between 1900 and 2014 in Turkey have been analyzed. Then, through examining all the databases, literature and available historical documents, a single updated list of the earthquakes that shows the fatalities and damages between 1900 and 2014 in Turkey has been prepared. Finally, in light of the data rearranged, the statistical facts about the losses in the historical earthquakes are presented. © 2016 Springer Science+Business Media Dordrecht


Ozbay E.,Iskenderun Technical University | Erdemir M.,Adana Cement Factory Iskenderun Plant | Durmus H.I.,Adana Cement Factory Iskenderun Plant
Construction and Building Materials | Year: 2016

Ground granulated blast furnace slag (GGBFS) is a byproduct from the blast-furnaces of iron and it is a very beneficial in the mortar and concrete production. The present paper reviews the literature related to the utilization and the efficiency of GGBFS on the properties of mortar/concrete. Firstly, general information about GGBFS production, reaction mechanism and heat of hydration are presented. Then, workability, setting time, bleeding, rheological properties, slump loss, segregation resistance and early age cracking potential and finishability are addressed among the fresh concrete properties. Strength and rate of strength gain, modulus of elasticity, creep, shrinkage, influence of curing on performance of GGBFS, permeability, resistance to freeze/thaw cycles, carbonation resistance, deicing salt scaling, alkali-silica reaction and sulfate attack are among reviewed hardened concrete properties. © 2015 Elsevier Ltd.


Erdogan Y.,Iskenderun Technical University
Bulletin of the Mineral Research and Exploration | Year: 2016

Buildings are large consumers of energy in all countries. In regions with harsh climatic conditions, a substantial share of energy goes to heat and cool buildings. This paper reports an investigation of the insulation materials made from mixing carpet wastes with a solution with added crude colemanite ore, one of boron minerals, and a solution with added colemanite wastes from a barrage. A new building insulation material was produced which is name, Halibor. Optimum mixing ratios were determined for mass production and the physical properties of the product were established. In addition, the material produced was compared with similar products used in buildings in terms of physical properties. As a result of the investigations, it was established that the product provides high heat and sound insulation and can be used easily in building and construction industry.


Balcikanli M.,Iskenderun Technical University | Ozbay E.,Iskenderun Technical University
Composites Part B: Engineering | Year: 2016

In this research, individual and interactional effect of curing temperature (CT), curing time (CTime), sodium concentration (SC) and silicate modulus (SM) on the compressive strength, chloride ion permeability, oxygen permeability and thermal conductivity of alkali activated slag (AAS) concretes were investigated and the best possible combination of CT, CTime, SC and SM for the maximization of compressive strength while for the minimization of chloride ion permeability, oxygen permeability and thermal conductivity of AAS concretes were determined. An experimental program that contains 21 different combinations of independent parameters (CT, CTime, SC and SM) was conducted by using the central composite design method. Alkali solution-slag ratio was kept constant at 0.53 in all production. The effects of the independent parameters were characterized and analyzed by using statistically significant quadratic regression models on the measured properties (dependent parameters). Optimum values of the independent parameters were determined by solving a multi-objective optimization problem obtained by using the proposed regression models for dependent parameters. The results of test and the analysis indicate that the independent parameters affect the dependent parameters considerably; however, the most effective parameter for the compressive strength, chloride ion permeability, oxygen permeability and thermal conductivity is the sodium concentration. The optimum combination of CT, CTime, SC and SM is 46.8 °C, 8.3 h, 5.5% and 2.0, respectively, for the minimization of chloride ion permeability, oxygen permeability and thermal conductivity and the maximization of compressive strength of AAS concretes. © 2016 Elsevier Ltd.


Mistikoglu S.,Iskenderun Technical University | Yavuz H.,Cukurova University
International Journal of Green Energy | Year: 2016

The increasing awareness of environmental issues attracts more attention on environmentally friendly energy sources. This leads to increasing research on effective use of renewable energy sources. Among them, wave energy offers a high potential. The wave energy converter systems used for transforming the wave energy into electrical energy have been a main research topic for decades. However, only a few of these systems has been successfully implemented. There seems to be some technical problems one of which is on their control applications. It has been reported that by means of appropriate control implementation, the performance of the wave energy converter system could be improved considerably. In literature, many different control techniques are reported. They appear to be weak due to implementation related restrictions. The present study proposes a novel control technique that is far more practical based on quantization of control settings. Various quantization levels and their effect on system power capture performance are studied. The technique assumes use of realistic off-the-shelf components with realistic features. The proposed method utilizes time-series-analysis technique with online parameter estimation feature. This new method does not require any knowledge of previous or future states of any of the system or sea state parameters, but only the currently available and measurable ones. The approach of the new control technique sets it apart from most of the previously reported ones. Therefore, the proposed technique is not only very much practical but also very much useful in improvement of the system power performance relative to passive techniques. © 2016 Taylor & Francis Group, LLC.


Saracoglu G.,Iskenderun Technical University | Yapici A.,Iskenderun Technical University
Engineering Failure Analysis | Year: 2016

This paper describes the fatigue failure of girth gear manufactured from low alloy cast steel of rotary dryer in a chemical plant. The cracks of T-section web of the girth gear occurred at the end of 25 year working period because of stress intensity factor. Because of normal condition of working surfaces of teeth, spare gear was not thought and repair welding was the only option. Nickel based super alloy electrode was used for repairing and it had been successful until the new gear was ordered. The factors behind the fatigue failure and the reasons of temporary repairment were discussed using the cause-effect diagram. Higher grade bolt using instead of design grade, insufficient stiffener of web, insufficient preparation of repair welding and wide section welding beads at the welding deposits were found as the reasons of changing the girth gear with the new one. © 2016 Elsevier Inc.


Bikce M.,Iskenderun Technical University | Celik T.B.,Iskenderun Technical University
Engineering Failure Analysis | Year: 2016

In the Van Earthquake of magnitude Mw = 7.2 on October 23, 2011, 48,666 buildings were severely damaged or collapsed, 604 people lost their lives and 1301 people were injured. During this earthquake, not only the buildings designed in accordance with the old earthquake codes but also the ones designed in accordance with the current Turkish Earthquake Code (TEC) were severely damaged. The purpose of this study is to reveal the reasons why the RC buildings designed in accordance with the current TEC as a result of static and dynamic calculations were severely damaged in the recent earthquakes. In this study, first, the buildings that were designed in accordance with the last two earthquake codes and damaged during the Van Earthquake on 23 October 2011 have been examined. Then, another severely damaged building that was designed in accordance with the TEC 2007 has been chosen as a possible model for similar situations. In order to explore the reasons behind the damage, detailed examination has been made both in the damaged structure and in its design calculations. Both situations in the project and implementation of the design have been analyzed by using IdeCAD and Sta4CAD modeling, as well as Sap2000 through which weak structural members have been determined. The findings have been evaluated in terms of design and implementation flaws, in compliance with the TEC 2007, modeling and acceptance error. When analyzed by modeling of its project, the building has not revealed any insufficient columns; however, in its implementation analysis, the damaged members have appeared to be insufficient. It has been determined that the damage was due to improper implementation of the project, incompatible production according to the TEC 2007 and lack of inspection. To mitigate possible fatalities and damages in the future earthquakes, implementations should be fully represented in the model of the projects, structural members in the projects should be built identically to their design, attention should be paid to the anticipated limitations in TEC 2007 during implementation, and stages of project and implementation should be inspected sufficiently. © 2016 Elsevier Inc.


Turker H.T.,Iskenderun Technical University | Ozbay E.,Iskenderun Technical University | Balcikanli M.,Iskenderun Technical University
Construction and Building Materials | Year: 2016

In this study, an experimental investigation was conducted on normal strength concrete to examine the pullout capacity variation of cast in place anchors with the embedded circular surrounding studs around the anchored rebar under monotonic loading. Keeping constant the compressive strength of concrete, diameter and embedment length of anchored rebar, influence of number of embedded studs and distance between the circular surrounding studs and anchored rebar were chosen as the experimental parameters. Studs were embedded circularly around the anchored rebar with 10 and 20 cm diameter and number of studs was 4, 6 and 8 in each layer. For control purpose, anchored rebar without embedded studs were also tested. Unconfined tension test was performed according to the guideline of European technical approval of metal anchors for use in plain concrete. Test results revealed that embedded studs increased the pullout capacity of cast in place anchored rebar, increasing the number of studs increased the pullout capacity gradually; however, there was no meaningful difference in the pullout capacity of anchored rebar with the increase of stud layer. © 2015 Elsevier Ltd.

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