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KTU
Trabzon, Turkey

Kudzys A.,Institute of Architecture and Construction | Lukoseviciene O.,KTU | Baltrukenaite-Kroskiene I.,UAB Projektu Centras
Journal of Civil Engineering and Management | Year: 2010

The expediency of using probability-based approaches in the analysis of beams subjected to lateral-torsional buckling is discussed. The values of buckling resistance moments and their uncertainties for rolled and equivalent welded I sections as particular members of the designed structures are analyzed. The safety margins of buckling steel sections exposed to permanent and variable vertical loads are modeled. The survival probability and reliability index of sections exposed to lateral-torsional buckling are considered. The prediction of probability-based safety of rolled and welded beams in buildings and civil engineering works are provided and illustrated by numerical examples. Source


Diglys D.,KTU
Proceedings of the International Conference on Information Technology Interfaces, ITI | Year: 2010

Precise Global Navigation Satellite System (GNSS) positioning using Real Time Kinematics (RTK) correction data is currently utilized in many fields of surveying, mapping and precision agriculture. In the near future, sub decimeter precision data usage is expected to extend to autonomous vehicles navigation and public safety areas. To satisfy this increasing demand of precision positioning correction bandwidth, new techniques and protocols in assistance and correction data transmission are needed. This paper reviews one such possible technique involving sending correction dataset via public wireless cellular networks. The data will be transmitted through a hybrid system integrating correction data broadcasted in the wireless cellular network control plane with AGNSS assistance data and correction metadata in the user plane. Through this system, the bandwidth intensive, low refresh rate data of GNSS system ephemeris, reference station and satellite identification is omitted from the main data stream. Instead, a constant bit rate (CBR) stream for correction data is used and bandwidth is conserved. The results show that the proposed system can achieve scalability required for widespread usage of sub decimeter level positioning data from GNSS. Source


Demir G.,Ondokuz Mayis University | Aytekin M.,University of Bahrain | Akgun A.,KTU
Arabian Journal of Geosciences | Year: 2014

Turkey confronts loss of life and large economic losses due to natural disasters caused by its morphologic structure, geographical placement, and climate characteristics. The Kuzulu (Koyulhisar) landslide, which caused loss of life and property on 17th March 2005, occurred in an area near the country's most important active fault, the North Anatolian Fault Zone. To mitigate and prevent landslide damages, prediction of landslide susceptibility areas based on probabilistic methods has a great importance. The purpose of this study was to produce a landslide susceptibility map by the logistic regression and frequency ratio methodologies for a 733-km2 area near the North Anatolian Fault Zone from the southeast of Niksar to Resadiye in Tokat province. Conditioning parameters, such as elevation, slope gradient, slope aspect, distance to streams, roads, and faults, drainage density, and fault density, were used in the analysis. Before susceptibility analysis, the landslides observed in the area were separated into two groups for use in analysis and verification, respectively. The susceptibility maps produced had five different susceptibility classes such as very low, low, moderate, high, and very high. To test the performance of the susceptibility maps, area under curve (AUC) approach was used. For the logistic regression method, the AUC value was 0.708; while for the frequency rate method, this value was 0.744. According to these AUC values, it could be concluded that the two landslide susceptibility maps obtained were successful. © 2014 Saudi Society for Geosciences. Source


Calik M.,KTU | Coll R.K.,University of Waikato
Journal of Science Education and Technology | Year: 2010

This paper reports on an investigation of the effectiveness an intervention using several different methods for teaching solution chemistry. The teaching strategy comprised a four-step approach derived from a constructivist view of learning. A sample consisting of 44 students (18 boys and 26 girls) was selected purposively from two different Grade 9 classes in the city of Trabzon, Turkey. Data collection employed a purpose-designed 'solution chemistry concept test', consisting of 17 items, with the quantitative data from the survey supported by qualitative interview data. The findings suggest that using different methods embedded within the four-step constructivist-based teaching strategy enables students to refute some alternative conceptions, but does not completely eliminate student alternative conceptions for solution chemistry. © Springer Science+Business Media, LLC 2009. Source


Yaylali-Abanuz G.,KTU | Tuysuz N.,KTU | Akaryali E.,Gumushane University
Journal of Geochemical Exploration | Year: 2012

The Arzular gold mineralization is located at the southern part of the Black Sea Tectonic Unit in northern Turkey. This belt hosts several high-potential epithermal gold deposits and it is highly probable that there are a number of undiscovered occurrences in the region. The presence of intensely altered areas, suitable structural elements and acidic intrusions indicates that the region has an important potential for epithermal gold. Soil geochemistry surveys are widely used for the exploration of buried mineral deposits. In this work the applicability of soil geochemistry surveys for exploration of buried mineral deposits was tested using various statistical methods. In this respect, concentrations of 16 elements have been assayed in about 50 soil samples collected from the Arzular area. Soil samples were taken from the B horizon. The data revealed elevated concentrations for gold (0.20-259.2 μg/kg), silver (23-26,972 μg/kg), arsenic (1.7-301.8. mg/kg), copper (54.09-170.7. mg/kg), zinc (5.1-261.3. mg/kg) and lead (2.6-385.45. mg/kg). Gold is significantly correlated with elements such as Sb, Cd, Pb, Ag, As, Cu and Mo. Relatively high anomaly contrasts between Au, As, Ag and Sb and their coinciding anomalies along an E-W trending fault at the eastern part of the field might indicate that As, Ag and Sb could be used as a pathfinder element for exploration of gold deposits. Factor analysis was applied to elements in soil samples and then distribution diagrams were prepared using the factor scores obtained. In a distribution diagram for mineralization-associated factor score, two anomaly fields along the E-W trending fracture line and one anomaly field at the eastern part were distinguished. The largest anomaly in an ellipsoidal shape with long axis of 350. m was obtained from the southeast part of the area. Anomaly patterns show that factor scores might yield suitable and net results for the exploration. NE-SW trending fracture system is not related to mineralization and is younger than E-W trending fracture line. However, the E-W trending fault system controls the mineralization; therefore, the eastern extent of this fault zone needs to be investigated. © 2011 Elsevier B.V. Source

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