Eskisehir Region Research Articles

Investigation Of Usability of Sepiolite as a Pozzolan in Production of High Performance Cementitious Composites

The continuous growth of population and urbanization in the world significantly increases the demand for cement. In terms of sustainability, the cement industry needs to develop new and effective pozzolans with the appropriate recycling of alternative raw materials. It is also important to evaluate sepiolite, which has very limited resources in the world compared to other industrial minerals and whose economic deposits are limited to Spain and Türkiye. In this study, the usability of sepiolite as a pozzolan in cement and its effects on physical, mechanical and durability properties were investigated. First of all, the chemical and physical properties of sepiolite in Eskisehir region were investigated. Crude and ground sepiolite calcined at 500 ºC, 700 ºC and 900ºC were substituted for CEM I 42.5 R class standard Portland cement at 5-10-15% and 20% ratios. The pozzolanic activities of produced sepiolite substituted cement were determined according to ASTM C-311. As a result, crude sepiolite retains more water than calcined sepiolite, thus negatively affecting the strength properties of the concrete. Additionally, sepiolite is considered suspicious (harmful-harmless) in terms of alkali silica reactivity except 10%-15%-20% crude sepiolite substitutions. Overall, It has been observed that sepiolite does not have sufficient pozzolanic properties in cementitious composites.

Geothermal potential of granites: Case study- Kaymaz and Sivrihisar (Eskisehir region) Western Anatolia

Radiogenic granites are gaining importance due to their ability to generate a substantial amount of electricity and support the advancement of agricultural and water sectors. In the western Anatolian region, such granites occupy a cumulative area of 6910 km2 varying from 7 to 20 μW/m3, far above the heat generated by the average continental crust of 5 μW/ m3. One cubic. The granite plutons of the Eskisehir region are amongst such granites with radioactive heat generation kilometer of such granite can generate 79 × 106 kWh of electricity. In the present case, the Eskisehir granites are capable of generating 616 million kWh of carbon-free electricity. Besides electricity, the heat from the granites can be utilized for space heating and greenhouse cultivation. This energy can also be utilized for the generation of fresh water from the sea through the desalination process. Hydrofracturing of the granites to create a fracture network connecting injection and production well is being replaced with closed-loop system that do not require knowledge about the stress pattern of the region and reduce the risk of induced micro-seismicity that was a bottleneck for developing EGS projects. Although the currently estimated cost of electricity generated from EGS projects is 9 euro cents/kWh, this cost will get reduced due to technological development in drilling technology. The Western Anatolian region has an additional advantage over the cost, since the drilling depth to capture the heat from the granites is shallow (∼3 km) which gives further benefit to the cost due to the reduction in drilling depth cost. In addition to high radiogenic granites, the presence of curie point temperature at shallow depth, high heat flow, and high geothermal gradient makes this region a warehouse of energy making Turkey energy-food and water independent in the future.

Genesis of the Pliocene conglomerate: Kütahya and Eskişehir—central west Anatolia, Turkey

Agate formation in the Pliocene conglomerates is found as nodules in the central western part of Anatolia and is unique in terms of sepiolite replacement. Therefore, the geology, mineralogy, and genesis of agate nodules in polymictic conglomerates from Yazlica in the Kutahya region are presented in this study. Furthermore, the properties of Yazlica agate are compared to Dereyalak agate formed in Pliocene conglomerates from the Eskisehir region. Yazlica agate nodules are formed from three to 30 cm in diameter and have mainly four different colors with a zoned appearance. XRD analyses show that chalcedony is the main silica mineral constituting agates in this region. The existence of sepiolite in agates was detected using XRD analysis in this research. DTA analysis also confirmed endothermic peaks at approximately 724°C and 737°C followed by exothermic peaks at approximately 800°C and 830°C, further indicating that sepiolite exists in Yazlica agates. Dereyalak dendritic agate nodules were formed in the same period (Pliocene) so the Yazlica agate formation was compared to the Dereyalak agate formation. This research concluded that both agate occurrences were formed through sepiolite replacement via low-temperature, silica-rich hydrothermal solutions within fracture systems.

Weighting of BLEG data with drainage and catchment properties to enhance Au anomalies

This research aims to take the effect of drainage sediment dilution into consideration by using catchment weighted-bulk leachable extractable gold (CW-BLEG) data in order to enhance and recognize Au anomalies. As a case study, an area in the Eskisehir region in Western Turkey was selected. In this area, gold-bearing crystalline quartz veins, of probable orogenic type, containing up to 20 g/t Au, occur in low-grade schists and marbles of the Karakaya Complex in the vicinity of the Sogut area. To classify the final geochemical maps of the BLEG data to differentiate Au anomalies from background, the singularity model was applied. After that, in order to take the sediments dilution effect (DE) into account, the other important factors in the study area such as the sinuosity index (SI) of the stream sediments per catchment, and the topography slope and area of each catchment were taken into consideration and implemented on the BLEG data. To do so, the CW-BLEG models based on the relation between the Au concentrations and each factor (i.e., C × sinuosity as DE-sinuosity, C × slope as DE-slope, and C × area as DE-area) were generated. Because of the insufficient number of known mineral deposits within the study area to evaluate the effectiveness of the models statistically, the models generated were compared with each other and studied using cross-validation. It demonstrated that the DE-area and DE-sinuosity models work better than the other model in recognizing strong and very strong anomalies considering the known mineral deposits. The cross-validation results show that the DE-area model provides a more robust result compared the other models. Considering the models generated, the very strong and strong Au anomalies in the western part of the study area are corresponded to the known gold mineralization (e.g., Sogut and Mayislar) hosted by the Karakaya Complex, and the anomalies in the eastern and central parts of the study area are associated with the Damdaca mineralization.

Investigation of the SCID mutant allele in Turkish Arabian horses reared in some private farms of the Eskişehir region in Turkey

There are several known hereditary diseases in Arabian horses. Many studies have been conducted on molecular diagnostic methods of the mutations that cause these hereditary defects in horses. A five-base deletion in the short arm ECA9p12 of the equine chromosome 9, starting with codon 9480, which occurs in the catalytic subunit gene of the DNA-dependent protein kinase DNAPKcs results in severe combined immunodeficiency SCID hereditary disorder. SCID is an autosomal recessive disorder wherein the immune system of the affected foal is very weak. Purebred Turkish Arabian horses reared in the Eskisehir region have contributed greatly to Turkish Arabian horse breeding and racing. The aim of this study was to detect the SCID mutant allele by using DNA sequencing analysis in Turkish Arabian horses, raised in nine different private farms in Eskisehir. It was determined that none of the horses evaluated in this study carried the SCID mutant allele.

Evaluation of Posterior Segment Diseases Using Optos and Telemedicine Application in Eskisehir Region

Evaluation of Posterior Segment Diseases Using Optos and Telemedicine Application in Eskisehir Region

The Early Neolithic pottery of Keçiçayiri and its place in the North-western Anatolian Neolithisation process

The region of Inner North-western Anatolia was a key node in the transmission of the Neolithic lifestyle from the Near East to Marmara, and from there to the Balkans and the rest of Europe. It formed the intersection between several important routes and trade networks, and the settlement of Keçiçayırı, the subject of this paper, had an essential role in the transfer of cultural elements during the Neolithic. The settlement is located on a natural communication route that connects the region of Emirdag-Bolvadin with Eskisehir across the mountainous area of Phrygia, between the distribution areas of the Hacılar and Fikirtepe cultural groups. Finds from the site include both Pre-Pottery Neolithic material and Early Neolithic ceramics, and it is therefore among the earliest permanent settlements of the Eskisehir region, and contains some of the earliest evidence for the Neolithisation process. In this paper, the pottery assemblage of the Early Neolithic settlement at Keçiçayırı is discussed, and its place in the spread of Neolithisation from the Near East to Northwestern Anatolia is evaluated when compared to other known sites.

The Early Neolithic pottery of Keçiçayiri and its place in the North-western Anatolian Neolithisation process

The region of Inner North-western Anatolia was a key node in the transmission of the Neolithic lifestyle from the Near East to Marmara, and from there to the Balkans and the rest of Europe. It formed the intersection between several important routes and trade networks, and the settlement of Keçiçayırı, the subject of this paper, had an essential role in the transfer of cultural elements during the Neolithic. The settlement is located on a natural communication route that connects the region of Emirdag-Bolvadin with Eskisehir across the mountainous area of Phrygia, between the distribution areas of the Hacılar and Fikirtepe cultural groups. Finds from the site include both Pre-Pottery Neolithic material and Early Neolithic ceramics, and it is therefore among the earliest permanent settlements of the Eskisehir region, and contains some of the earliest evidence for the Neolithisation process. In this paper, the pottery assemblage of the Early Neolithic settlement at Keçiçayırı is discussed, and its place in the spread of Neolithisation from the Near East to Northwestern Anatolia is evaluated when compared to other known sites.

Exploration of Parents’ Digital Parenting Efficacy through Several Demographic Variables

As digital technologies develop, they provide individuals with new opportunities in various areas of daily life. However, these technologies also bring about some potential risks. Through digital technologies, several risks including but not limited to malicious content, cyberbullying, pornography, and sexually-explicit messages can easily reach out to households. The most vulnerable group for such risks is the children. As parents are primarily responsible for the well-being of their children, they have an important role in protecting the children in the digital environment. Parents need to get acquainted with the digital age so that they could protect their children from the risks pertaining to the use of digital technologies. The purpose of this study was twofold: (a) to identify digital parenting efficacy domains and their indicators, and (b) to examine parents’ efficacy levels in terms of some demographic variables through a measure based on the identified indicators. The study was survey research with two phases. In the first phase, based on a literature review and a focus group interview with experts, digital parenting efficacy fields and their indicators were identified. In the second phase, a digital parenting self-efficacy scale was developed and administered to 576 parents in Eskisehir region to explore the participants’ self-efficacy levels based on parenting roles, internet use, income level, occupation, and educational level. The digital parenting competencies and their indicators used in the scale development process consisted of seven dimensions. Through the participation of separate samples of parents, the factorial structure of the scale was examined through exploratory (n=520) and confirmatory factor analyses (n=556). After construct validity steps, indicators were gathered under three factors as digital literacy, digital safety, and digital communication. These indicators did not differ based on parents’ role in the process, internet use, socio-economic status, occupation, and level of education.

Development of using local raw materials deposits in Eskisehir region, Turkey

Local clayey raw materials and feldspathic rocks of Eskisehir sources were characterized, and its influence in facade cladding tile compositions was evaluated. Dilatometric studies for disclosing peak firing temperatures and regimes showed significant and substantial linear shrinkages as densification proceeded. The results also indicated that the standard composition did not resist over 920 °C. Body compositions containing feldspathic rocks yielded the lowest water absorption and highest strength values at 1160 °C due to improved densification. SEM of a selected sample at 1160 °C showed the presence of uniformly distributed, spherical and isolated pores in the matrix. In addition, water absorption values were advanced in group AIIa European standards (EN 14411), breaking strength increased and acceptable colours were obtained.

EFFICIENCY ANALYSIS OF THE SOLAR TRACKING PV SYSTEMS IN ESKISEHIR REGION

In this study, efficiency analysis of the tracking solar photovoltaic (PV) system in Eskisehir region is considered for onsite real solar power generation values. It is shown that the tracking system’s power generations are always higher than fixed one, but increased yield ratio is changing according to weather conditions (sunny or cloudy times). In order to make a fair analysis/comparison, all the instantaneous real solar power generations between 1 July and 30 October 2016 are used to figure out the ratio of sunny and cloudy days of whole year. The averaged total generation values are calculated and it is revealed that tracking system provides approximately 33 % higher yield from same capacity fixed PV panels for Eskisehir region.

The frequency of occult HBV infection in Eskisehir region of turkey between 2001-2015

The frequency of occult HBV infection in Eskisehir region of turkey between 2001-2015

The Distribution of Hepatitis C Virus Genotypes of Patients with Chronic Hepatitis C Infection in the Eskisehir Region of Turkey

The Distribution of Hepatitis C Virus Genotypes of Patients with Chronic Hepatitis C Infection in the Eskisehir Region of Turkey

The distribution of hepatitis C virus genotypes of patients with chronic hepatitis C infection in Eskisehir Region of Turkey

The distribution of hepatitis C virus genotypes of patients with chronic hepatitis C infection in Eskisehir Region of Turkey

The frequency of occult HBV infection in Eskisehir region of Turkey between 2001 and 2015

The frequency of occult HBV infection in Eskisehir region of Turkey between 2001 and 2015

Screening for bovine leukocyte adhesion deficiency, deficiency of uridine monophosphate synthase, bovine citrullinaemia and factor XI deficiency in Holstein cattle

Holstein cattle reared in Eskisehir region were monitored with respect to the genetic disorders defined as bovine leukocyte adhesion deficiency (BLAD), deficiency of uridine monophosphate synthase (DUMPS), bovine citrullinaemia (BC) and factor XI deficiency (FXID). To determine the presence of BLAD, DUMPS, BC and FXID genotypes, Holstein cattle (219) were sampled. Three BLAD and 2 FXID carriers were identified among the 219 Holstein cattle examined, while none of the cows carried DUMPS and BC. Current study demonstrated that carriers of BLAD and FXID are present in the Turkish Holstein population in Eskisehir region, although at a low frequency. Since, artificial insemination is widely used in these populations, determination of the carriers of hereditary disorders within the population of breeding sires has become essential. To prevent economic losses resulting from genetic disorders, it is advised to screen breeding sires for these genotypes. The aim of this study was to investigate existence and prevalence of BLAD, DUMPS, BC and FXID alleles in Holstein cattle reared in Eskisehir region by using PCR and PCR-RFLP methods.

HCl leaching behaviour of a bastnasite ore in terms of thorium and rare earth elements

Today, nuclear energy is considered as one of the most important energy sources. Thorium (Th) is also very important for nuclear energy because it can exist in nature spontaneously just as uranium (U) without depending on presence of another radioactive element. As plutonium and other trans-uranium elements are produced in lesser amounts compared to U in Th fuel cycle, Th is considered as the cleanest nuclear plant fuel. Bastnasite is one of the minerals which Th can be economically obtained. Bastnasite (Ce, La)FCO3, which is a rare earth fluorocarbonate, contains approximately 0.2–0.3% Th and 75% rare earth oxides. Within the scope of this study, dissolution behaviour of Th and rare earth element (REE) contents present in the bastnasite ores which is obtained from Eskisehir region of Turkey, with HCl leaching method was examined. In this context, the effects of different leaching parameters such as leaching time, HCl concentration and pulp temperature on Th and REE (Ce, Nd, La) dissolution efficiency and the best results have been obtained in the conditions of 5.48 M of HCl dosage, 220 min. of leach time and 70°C pulp temperature. In these optimum conditions, Th, Ce, Nd and La were obtained with dissolution efficiencies of 80.12, 77.12, 70.12 and 71.13%, respectively.

The positivity for human papillomavirus (HPV) DNA and evaluation of probable risk factors among women in Eskisehir region

The positivity for human papillomavirus (HPV) DNA and evaluation of probable risk factors among women in Eskisehir region

Plant Location Selection in Natural Stone Industry

Determining the most convenient plant location is one of the commonly encountered problems in engineering applications. This paper presents an Analytic Hierarchy Process (AHP) model, which is developed for selecting the optimum plant location for marble/travertine factories in natural stones processing industry. The whole criteria which affect the decision making process in marble industry were determined to solve plant location problem in the AHP model. To determine optimum marble plant location for a new marble factory, which is planned to install by a mining firm located in the Eskisehir region in Turkey, an analysis was carried out by introducing the AHP method which is one of the well-known classical Multiple Attribute Decision Making (MADM) methods. This analysis shows that the AHP method can successfully be applied for the selection of plant location as well as any decision making process in natural stone industry.

Determination of Slake Durability Index with Spherical Samples

In this study, the preparation method of the equivalent sized spherical samples which is called as Pasha Method is applied to slake durability index test. In order to apply this sample preparation method, white and pink tuff samples were collected at the tuff quarries located at the Eskisehir region in Turkey. After sample preparation stage, these tuff samples were subjected to the Slake Durability Index test in the laboratory. According to the test results presented in this paper, the highest slake durability index values were obtained from equal-sized spherical test samples that are prepared according to the new method, Pasha Method, when compared to the other two types of samples.