Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering最新文献

{"title":"THE NOVEL CONFORMABLE METHODS TO SOLVE CONFORMABLE TIME- FRACTIONAL COUPLED JAULENT-MIODEK SYSTEM","authors":"Özkan Avit, Halil Anaç","doi":"10.18038/estubtda.1380255","DOIUrl":"https://doi.org/10.18038/estubtda.1380255","url":null,"abstract":"This research utilizes two novel methods, specifically the conformable q-homotopy analysis transform method (Cq-HATM) and the conformable Elzaki Adomian decomposition method (CEADM), to examine the numerical solutions for the conformable time-fractional coupled Jaulent-Miodek system. One of the two unique methods proposed is the Cq-HATM, which is a hybrid approach that combines the q-homotopy analysis transform method with the Laplace transform, employing the concept of conformable derivative. The CEADM method, similar to the aforementioned approach, is a hybrid technique that combines the Adomian decomposition method with Elzaki transform through the utilization of the concept of conformable derivative. The computer simulations were performed to offer validation for the effectiveness and dependability of the suggested approaches. After conducting a comparison between the exact solutions and the solutions acquired using the unique methods, it is apparent that both of these approaches demonstrate simplicity, effectiveness, and competency in tackling nonlinear conformable time-fractional coupled systems.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"40 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140493226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE TRAVELING WAVE SOLUTIONS OF THE CONFORMABLE TIME-FRACTIONAL ZOOMERON EQUATION BY USING THE MODIFIED EXPONENTIAL FUNCTION METHOD","authors":"Aslı Alkan, T. Aktürk, Hasan Bulut","doi":"10.18038/estubtda.1370631","DOIUrl":"https://doi.org/10.18038/estubtda.1370631","url":null,"abstract":"The present study focuses on the acquisition of traveling wave solutions associated with the conformable time-fractional Zoomeron equation through the utilization of the modified exponential function method (MEFM). The solution functions derived from mathematical computations encompass hyperbolic, trigonometric, and rational functions. Various graphical representations, such as 2D, 3D, contour graphs, and density graphs, are utilized to visually depict the distinct features of the solution functions derived from the determination of suitable parameters.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"110 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS, CHARACTERIZATION OF CYANIDE COMPLEXES WITH 2-(HYDROXYMETHYL)PYRIDINE BY VIBRATIONAL SPECTROSCOPIC, THERMAL STUDIES AND ELECTRICAL PROPERTIES","authors":"E. Sayin, G. S. Kürkçüoğlu","doi":"10.18038/estubtda.1229463","DOIUrl":"https://doi.org/10.18038/estubtda.1229463","url":null,"abstract":"In this investigation, we present synthesis and characterized of three new heteropolynuclear cyanide complexes with 2-(Hydroxymethyl)pyridine (hmpH) of [M(H2O)(hmpH)Ni(CN)4]2·nH2O, (M(II) = Fe, Co and Ni); n = 12 for Fe, 2 for Co and Ni). The obtained complexes have been studied by elemental, thermal analysis, FT-IR, and Raman spectroscopic measurement techniques. Considering the alterations in characteristic peaks of cyanide, aqua, and hmpH ligands, general knowledge about the structural features of the complexes was detected from the vibrational spectra. The Ni(II) ion is coordinated by four cyanide-carbon atoms forming a square planar geometry. In addition, thermal analyses and electrical features of the complexes were investigated.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"377 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVERTED BRAYTON CYCLE ENGINE OPTIMIZATION FOR HYPERSONIC FLIGHT","authors":"Mustafa Karabacak, O. Turan","doi":"10.18038/estubtda.1270986","DOIUrl":"https://doi.org/10.18038/estubtda.1270986","url":null,"abstract":"Optimization of inverted Brayton cycle engine is made by particle swarm optimization method in this study. The optimum specific thrust value is reached by staying within the optimization constraints. When the total temperature of the cooling section is examined, it is seen that a temperature above the freezing temperature of the air is obtained. A very high specific thrust value, 451 N.s/kg is obtained at the hypersonic flight Mach Number (5 Mach) as a result of optimization. Temperature decrease with increasing altitude effect performance dramatically as positive. Low preburner exit total temperature and turbine total pressure ratio values and high afterburner exit total temperature values are desirable in terms of performance but values of total temperature at cooling section effect performance conversely in terms of specific thrust and specific fuel consumption","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"420 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A GIS-SUPPORTED ANALYSIS ON ACCESSIBILITY IN WOMEN-FRIENDLY SOCIETIES: EVALUATION OF WALKING ROUTES AT NIGHT HOURS","authors":"Ezgi Tükel, K. Çubukçu, S. Cabuk, Gürkan Öztürk","doi":"10.18038/estubtda.1283488","DOIUrl":"https://doi.org/10.18038/estubtda.1283488","url":null,"abstract":"Developing safe cities is one of the Sustainable Development Goals (SDGs) and a vital factor in creating sustainable communities and cities. From this point, ensuring that women use urban spaces accessibly and safely is crucial. This study aims to determine the walking routes between the most used venues in Kadıköy district, Türkiye, open at night hours, and the transportation points using GIS methods. Density analysis was made using Foursquare check-in data collected from 4 different categories in July 2021, and the closest walking routes between the locations and the bus stops were developed using closest facility analysis. The results were classified in a 5-scale suitability range, in which 5 refers to the highest density and more accessible (closest) bus stops. Zone 2 has 266 shortest routes, while zone 5 has 90 shortest routes and there are many eating and drinking places on the shortest routes. Lastly, some sample routes from the densest and least dense routes were observed using Google Street views in terms of safety criteria. The results and the approach used in this study are expected to encourage the local authorities and the decision-makers to improve safe access between the venues and transportation points.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"39 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"KAOLIN FORMATION IN YATAĞAN (MUĞLA) LIGNITE DEPOSIT","authors":"Z. Büçkün, M. Çolak","doi":"10.18038/estubtda.1370311","DOIUrl":"https://doi.org/10.18038/estubtda.1370311","url":null,"abstract":"The 30-km-long and 10-km-wide, coal-bearing Yatağan Basin is located in SW Anatolia, close to the eastern coast of the Aegean Sea, Türkiye. The basement consists of Menderes Massif metamorphics in the NW part of this intermontane basin, c. 80-km2-large area (Turgut lignite deposit). The Neogene and Quaternary sedimentary filling comprises fluvioterrestrial, limnic and telmatic sediments which contain a mineable coal seam up to 15 m thick, unconformably overlain the basement. Two fresh and six weathered samples were picked up from the Menderes Massif gneiss outcrops of the catchment area. Eight sedimentary rocks, inorganics over and underlying the coal seam, were obtained from four borehole cores. All samples were examined under the optical microscope; XRD, SEM-EDX and ICP-MS analyses were later performed. This study aims to examine the mineralogical content and geochemical processes of the sedimentary rocks from different formations, namely Sekköy and Turgut Formations, which are over- and underlying the lignite horizon, to assess the clay mineral formations and transformations. Gneiss samples contain mainly quartz, plagioclase, K-feldspar, muscovite and biotite with a lesser amount of tourmaline, chlorite, garnet, apatite, zoisite, zircon and Fe-oxides. The -2 µm fraction consists mainly of illite, with fewer smectite and kaolinite. Sericitizitation of feldspar is the main product in gneisses. Coal over-and underlying sedimentary rock samples contain mainly quartz, plagioclase, K-feldspar, muscovite, and biotite with less pyrite and iron oxides. The -2 µm fraction of the sedimentary rock samples consists of variable clay mineral contents. Kaolin content is higher in acidic conditions with an opposite correlation to smectite occurrences. The geochemistry of Menderes Massif gneisses shows that it gave felsic material to the catchment area, whereas the geochemistry of sedimentary rocks is not coherent in all cases. Geochemical parameters like CIA and PIA proved that weathering processes of the source materials prevailed during the generation of these sedimentary units.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139209803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECT OF BENTONITE AND DOLOMITE ADDITIVES ON RIGID POLYURETHANE","authors":"Sinem Tümük, Bilgehan Güzel, Erdem Deli̇l","doi":"10.18038/estubtda.1367889","DOIUrl":"https://doi.org/10.18038/estubtda.1367889","url":null,"abstract":"In this study, clay minerals such as bentonite and dolomite were included to increase the compressive tensile strength and decrease the thermal conductivity of rigid polyurethane foam. The effect of different combinations and amounts of clay minerals on the test parameters of the foam was investigated. The surface morphology of the doped foams was investigated by scanning electron microscopy (SEM). Polyurethane foams were subjected to compressive-tensile strength and thermal conductivity tests. Improvement was observed in the thermal conductivity of polyurethane foams containing 1% bentonite and in the compressive and tensile strengths of polyurethane foams containing 2% dolomite. When clay minerals were added to polyurethane foam in combination, both thermal conductivity and compressive and tensile strengths were improved.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"129 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TUZLUCA (IĞDIR-TÜRKİYE) ÇEVRESİNDE YÜZEYLENEN MİYOSEN YAŞLI KAYAÇLARIN MİNERALOJİK VE JEOKİMYASAL ÖZELLİKLERİ","authors":"Türker Yakupoğlu, Enver Karasu","doi":"10.18038/estubtda.1369922","DOIUrl":"https://doi.org/10.18038/estubtda.1369922","url":null,"abstract":"In this study, Miocene lithostratigraphic units (Turabi, Çincavat and Tuzluca formations) outcropping in the Neogene Kağızman-Tuzluca Basin in the west of Iğdır province were studied. The units are represented by evaporatic, carbonate and clayey rocks. The study aims to determine the mineralogical and geochemical properties of these rocks and to interpret the paleoenvironmental conditions. XRD (X-ray diffraction) whole rock and clay fraction analyzes, OM (Optical Microscope) studies, element determination with XRF (X-ray fluorescence) and, FE-SEM / EDS (Field emission scanning electron microscopy-energy dispersive X-ray spectrometry) studies of rock samples taken along the sections measured in the field were carried out for this purpose. Quartz, feldspar, mica, calcite, gypsum and halite minerals were determined in whole rock compositions of the samples. Smectite, illite, chlorite and paligorskite minerals were found in the clay fractions. It has been determined that feldspars altered to smectite by SEM and EDS studies. Optical microscopy and paleoenvironment studies indicate that the origins of gypsum, halite and palygorskite minerals are authigenic. It was also determined that calcite was authigenic and detritic, while chlorite, illite, quartz, feldspar and mica were detrital. The predominance of smectite, as well as the presence of chlorite, illite and palygorskite indicate that the basin developed under alkaline conditions, mostly hot and humid, and occasionally arid and cold conditions. In geochemical analyzes, the positive correlation of SiO2 with other major oxides (excluding CaO, MgO and SO3) is the input of clay and clastic materials, while the negative correlation of SiO2 with SO3 and CaO is associated with the decrease in the rate of CaSO4 sediments as a result of shallowing of the basin due to evaporation of water.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139209536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE ROLE AND IMPORTANCE OF MEERSCHAUM-TYPE SEPIOLITE IN THE PROMOTION OF TÜRKİYE","authors":"Nusret Güngör, Behzat Gökçen Demi̇r, Ali Koray Özdoğan","doi":"10.18038/estubtda.1370092","DOIUrl":"https://doi.org/10.18038/estubtda.1370092","url":null,"abstract":"The main factors in the recognition and promotion of countries, cities and regions can be summarised as economic strength, sports achievements, cultural accumulations, underground resources, and scientific and technological developments. Within the scope of underground resources, meerschaum-type sepiolite continues to be used in the production of ornaments, jewellery and souvenirs, and the display of items made of this type of sepiolite in showcases and museums in areas where other types of sepiolite cannot be used continues to ensure the recognition of the countries and cities where it is produced and processed. The meerschaum-type sepiolite is a magnesium-based clay mineral that has played an important role in the recognition and promotion of our country in the world for centuries. The role and importance it plays in the recognition and promotion of Türkiye is considered to be the work of its attributive properties based on its formation mechanism. Many of these unique features have enabled it to find more and more usage areas, turn into a work of art, and be recognised. This first recognised type of Turk sepiolite is described as an ambassador of culture and peace, as it has served as a bridge between our country and some countries for centuries. The quality of the Turk meerschaum-type sepiolite based on its superior properties, the fact that it has maintained this quality throughout the reserve for a long time, and the very important works created by valuable craftsmen and artisans are another point that plays an important role in the recognition of our country. In addition to training meerschaum masters and artisans when processed, it also creates significant added value. The export of raw meerschaum was banned in 1972 due to its importance in recognising and promoting our country by creating significant added value as well as training meerschaum masters and artisans. Meerschaum-type sepiolite has given birth to both an important business line and a branch of art in Eskişehir. Meerschaum processing workshops, which are intensively visited by local and foreign tourists coming to Eskişehir, and the Meerschaum Museum in Odunpazarı district will accelerate the better explanation and promotion of this important clay and the abandonment of the name “Vienna Stone”.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139283128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"WHOLE ROCK AND CLAY MINERALOGY OF EARLY MIOCENE SEDIMENTARY ROCKS OUTCROPPING IN THE NORTHEAST OF KORKUT (MUŞ-TÜRKİYE)","authors":"T. Yakupoğlu, Kerem Erdoğanli","doi":"10.18038/estubtda.1369882","DOIUrl":"https://doi.org/10.18038/estubtda.1369882","url":null,"abstract":"This study was carried out to reveal the origins and formations of the minerals by determining the mineralogical compositions of Early Miocene aged sedimentary rocks outcropping in the northeast of Korkut district, 20 km from Muş. 75 rock samples were taken by measuring two stratigraphic sections from Mollababa Formation (Aquitanian) and Aktaş Formation (Burdigalian) cropping out in the study area. XRD (X-ray diffraction) WR (whole-rock) analyzes were performed on these rock samples, and calcite, quartz, feldspar, clinoptilolite and clay minerals were determined in their compositions. CF (clay fraction) mineralogical compositions were determined by performing XRD detailed clay analyzes on 20 selected rock samples. In clay fractions; chlorite, illite, serpentine, mixed- layered chlorite-vermiculite (C-V) and non-clay minerals such as calcite, quartz and feldspar were determined. SEM-EDS (scanning electron microscope - energy dispersive X-Ray Spectroscopy) studies were carried out on five selected samples, and in addition to clay minerals such as feldspar, calcite, chlorite and C-V, fossils were also observed. When all the data were evaluated, it was interpreted that the chemical and biogenic origin of the calcite mineral, the detrital origin of the quartz, feldspar, chlorite and serpentine minerals, the neoformation product of clinoptilolite, C-V mineral formed from dark-colored minerals with negative transformation.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"208 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}