In this study, the failures in Transformer Centers in Mersin Province Erdemli District have been investigated. The causes of the failures have been discussed. It is aimed to create a method for the reasons of possible failures of power transformer. The data have been collected by investigating the faults occurring at the Erdemli Substations. The failure statistics of the 200 power transformer failures that occurred between 2003 and 2019 in the Erdemli district of Mersin province have been examined. Examples of different power transformer failures have been given in fault analysis. The reasons of power transformer failures and the precautions to be taken have been explained.

Mathematical modeling has been extended to simulate some physical systems to calculate some parameters that may need a sophisticated cost or may have some obstacles to be measured directly with an experimental method. In this study, the Modified Callaway Model has been used to calculate size dependence lattice thermal conductivity (LTC), and the influence of carrier concentration for bulk Si and its nanowires (NWs) with diameters of 22, 37, 56, and 115 nm has been investigated. Calculations were performed from 3K to 1600K for all cases. The effects of carrier concentration on LTC has found to begin from (10 16 cm -1 ) for the bulk state and that increased to (10 24 cm -1 ) for the NW with a diameter of 22 nm. The temperature that the maximum effect of carrier concentration can occur, has found to be at (10 K) for the bulk, and that increased to (340 K) for the (22 nm) Si NW.

In this study, MAG welding method was used. 2 mm thick TRIP 800 steel sheets are used in different welding parameters. Microstructures of welded joints were analyzed by taking OM (optical microscope) images from the main metal areas of the welding zone, HAZ (the region under the influence of heat). Depending on the welding parameters, (welding current: 40-50-60 Ampere, and welding speed: 5-7.5 mm/sn), ferritic, HAZ and martensitic phase regions were determined in microstructures in the main metal, HAZ and welding regions, respectively. The strengths of the welded connections were measured using the tensile test. Welding wire speed is chosen to obtain high penetration and ideal width welding seams. The strength of the welded bond using these parameters is determined as 1266 MPa as the highest value. It was determined that grain growth and martensitic phase transformations occur in fusion regions and result in brittle fracture. The Fusion zone and other regions were analyzed with finite elements.

In this study, Penning ion trap, which traps ions using electric field and magnetic field, is investigated. Penning traps are used in many laboratories around the world. Penning trap is used for mass determination as a mass spectrometer in basic physics research, for controlling quantum states and for ion trapping. Simbuca simulation program was used for other quantities of single ion or multiple ions such as ion dynamics and ion temperature. Simbuca is a modular Penning (ion) trap simulation program written in C++ programming language. Ideal Trap was used for ions. It is also used as a simulation of ion movement in a Penning trap with realistic Buffer gas collisions and Coulomb interaction using the A Graphics Card. However, Coulomb is a program applicable to other applications requiring charged particle tracking under the influence of electric and magnetic fields, with or without interaction. Buffer Gas method was used to cool the trapped ions. Helium gas, one of the noble gas atoms, was used as buffer gas. Ion dynamics of ions before and after the use of buffer gas were investigated. The data from the trap is set to 1 ms. In addition, using the same trap parameters and initial values for ions, the temperature values before and after the application of buffer gas for 100 units of 7 Li and 11 B ions were calculated separately. In addition, temperature changes for different ions were investigated using Coulomb effect for 100 ions.

This study aims to investigate hydrogeological, geochemical and geotechnical properties of the Aksaray University campus area. Within this context, the hydrogeochemical results of water samples collected from 4 different water points from the campus area, geochemical analysis of 17 soil samples, and geotechnical properties of rock samples obtained from drill core and description of core-logging performed in 2008 were evaluated. Hydrogeological studies have shown that two different water facies with Na-Cl and Ca-Cl water types developed in the study area. These waters are classified as low quality, but usable, and 3rd quality for irrigation water according to irrigation water standards and electrical conductivity values. According to geotechnical experiments, it was determined that the argillaceous limestone, which spread widely under the cover of the campus area, had bearing capacity of 36.5 kg/cm2 and belonged to the low strength rock class. As and Pb contents of the soil samples are at higher values, compared to the average upper crust values. According to the anomaly distribution maps prepared for Cl and Na elements, it was determined that east, southwest and northwest parts of the campus area contain higher values of Na and Cl than that of other parts of campus. The results of this study will provide more planned and efficient green-area studies to be carried out in the campus area and protection of the green-areas.