http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13954 Thu, 23 Apr 2026 07:02:36 GMT 2026-04-23T07:02:36Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14758 Archaeometric Investigation of Gold Coins (Byzantine Period, Romanus Iii) By Means of Portable Xrf: Characterization and Comparison BAYAZİT, Murat; ŞEKER, Nesrin Some of the ancient materials in museums can only be examined on-site, which requires in-situ analysis techniques. Coins made of precious metals are one of such materials and portable X-ray fluorescence (p-XRF) spectrometry is one of the most preferred technique for gold and silver-based coins that need to be characterized in situ and non-destructively. In this study, a detailed archaeometric investigation was carried out for the gold coins which were unearthed after the excavations in Melik Ahmet Street (Diyarbakır, 1992) and brought to Directorate of Diyarbakır Museum through confiscation. The chemical compositions of the samples were specified by means of portable XRF which was applied on 45 gold coins of the Romanus III period. The main element in the composition was found as gold detected as 93.89% in average. Silver was the most abundant element after gold, however the highest silver rate did not exceed 9% (5.25% in average). Copper and iron were identified respectively in 12 coins (Cu: 1.05-2.46%) and 18 coins (Fe: 0.87-6.5%). Manganese, nickel, titanium, lead, iridium and osmium were seen in one sample each. The hierarchical clustering analysis applied with gold-silver-copper-iron and gold-silver suggested three different groups. The hierarchical clustering analysis was also applied considering the p-XRF data achieved in this study (belonging to the Romanus III period), solidus samples belonging to six Byzantine period emperors, and for the hollow coins belonging to four Byzantine period emperors. Taking into account the distribution, classification and the variations, the coins of different emperor periods were compared. Sat, 01 Jan 2022 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14758 2022-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14756 On Certain Properties of Bipolar Fuzzy Supra Preopen Sets PAZAR VAROL, Banu supra preopen set, BF supra precontinuous mapping. Abstract The goal of this paper is to investigate the certain properties of bipolar fuzzy supra preopen sets (BF supra preopen set). We introduce and study the concepts of bipolar fuzzy supra pre-interior (BF supra pre-interior) and bipolar fuzzy supra pre-closure (BF supra pre-closure) operators. Furthermore, we define new type of bipolar fuzzy supra continuous mapping based on the BF preopen sets. Sat, 01 Jan 2022 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14756 2022-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14754 The Effect of Periodic Inspection and Safety Criteria on the Service Life of Steel Construction Conveyors GÜVEN, Ersin Asım Steel construction structures are seen in many different applications in our country and in the world. However, the periodic maintenance of these steel construction products is explained by national and international laws and regulations. According to the relevant regulation in our country, it is obligatory to carry out periodic inspections of these constructive structures, which are referred to as machinery and equipment, once a year. As in many facilities, it is obvious that these structures are the main elements of the facility and will be used throughout the life of the facility. It is not clear under which conditions these structures, which are generally produced using structural steels and which are connected by welding or bolts, will be examined in the periodic inspections. As a result of the research on the lifetime of general structural steels, it has been proved by many researchers that these structures have an infinite life if they reach the number of million repetitions. However, the life of welding or bolts, which are the connecting elements of the structure, remains uncertain. In this study, accident breaking studies were carried out by detailing the damage due to a tragic accident in a steel construction that has served for about 36 years. By keeping company and personal information confidential, the steel structure and bolt connections of the construction were examined in terms of strength, hardness and microstructure, and the results were detailed Sat, 01 Jan 2022 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14754 2022-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14753 Evaluation of Structural Safety of a Steel School Building with Partially Modified Structural System PEKGÖKGÖZ, R. Kadir; AVCİL, Fatih; GÜREL, M. Arif In order to meet the basic needs of foreign asylum seekers coming to our countries such as shelter, nutrition, and education, our government has established temporary shelters in different regions of our country. One of them is a completely disassembled steel school building with 23 classrooms, the carrier system of which is steel construction, in order to meet the educational needs of the temporary shelter located in the Ceylanpınar district of Şanlıurfa city. The roof of this school was designed as a plane truss system made of steel construction. The truss system, which was designed as a single part in the architectural and static application projects of the building, was separated from the symmetry axis and manufactured in two parts since it provides ease of transportation, manufacturing, and assembly by the contractor company. These parts were connected with bolts during manufacturing. In this study, as a result of the examinations carried out according to the regulations and standards in force at the time the building was designed, it was determined that constructing the system in two parts and connecting it with bolts does not pose a problem in terms of service safety of the building. Sat, 01 Jan 2022 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14753 2022-01-01T00:00:00Z