Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering最新文献_第3页

USAGE OF BILECIK LEFKE STONE AND BENTONITE CLAY FOR PHOSPHORUS REMOVAL IN WATER 使用比勒西克-莱夫克石和膨润土去除水中的磷

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-11-08 DOI: 10.18038/estubtda.1369455

Betül Çanga, Ramazan Meral, Çayan Alkan

{"title":"USAGE OF BILECIK LEFKE STONE AND BENTONITE CLAY FOR PHOSPHORUS REMOVAL IN WATER","authors":"Betül Çanga, Ramazan Meral, Çayan Alkan","doi":"10.18038/estubtda.1369455","DOIUrl":"https://doi.org/10.18038/estubtda.1369455","url":null,"abstract":"The rapid increase in the world population, the development of the industry, the excessive usage of fertilizers in agriculture, and the increase in detergents and chemicals used for cleaning accelerate the pollution of water resources. Conservation and recovery of damaged water resources along with the deteriorated ecosystem is of great importance for living things. An important part of water pollution in lakes and rivers is the increase in the content of nutrients. Nutrient elements, especially phosphorus, cause the transparency of water to decrease gradually. Over time, this situation, called eutrophication, causes an algae bloom and the aquatic ecosystem is disrupted. Uncontrolled discharge of wastewater containing phosphorus in high concentrations accelerates this process. These nutrients must be removed in order to maintain water quality and reduce the risk of eutrophication. The main ways of removing phosphorus from water are physical, chemical and biological methods. Among these, as an alternative to settling with chemical substances, the usage of clay (based on fixation) has an important place. In this study, different dosages of bentonite, lefke stone and ferrous sulphate heptahydrate (FeSO4.7H2O) were used in water with three different pH values (4, 7 and 10) and three different phosphorus contents (20, 40, 60 ppm). The per cent yields of the phosphorus removed with ferrous sulphate heptahydrate, lefke stone and bentonite are 72%, 57% and 39%, respectively. In addition, it was determined that the dosage of additives used should be renewed depending on the phosphorus content of the environment and that the high pH value of the environment increased the efficiency, especially in the usage of ferrous sulphate heptahydrate. In conclusion, as an alternative to the usage of chemicals, it has been revealed that lefke stone can be used for phosphorus removal in water, and its effectiveness can be further increased with further studies.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282479","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}

引用次数: 0

DETECTION OF RHODAMINE VIA SURFACE ENHANCED RAMAN SPECTROSCOPY UTILISING AG NANOWIRES 利用 Ag 纳米线的表面增强拉曼光谱法检测罗丹明

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-11-06 DOI: 10.18038/estubtda.1237440

K. Ay

{"title":"DETECTION OF RHODAMINE VIA SURFACE ENHANCED RAMAN SPECTROSCOPY UTILISING AG NANOWIRES","authors":"K. Ay","doi":"10.18038/estubtda.1237440","DOIUrl":"https://doi.org/10.18038/estubtda.1237440","url":null,"abstract":"Rhodamine, which is extensively used as a synthetic dye in food industry, is regarded as an illegal additive by European Food Safety Authority because of its carcinogenic and toxicological properties. Since it’s a colourless material at low concentrations such as 10-7 M, its detection via spectroscopical methods is very challenging and crucial in terms of food safety issues. Surface Enhanced Raman Spectroscopy (SERS) provides a fast and cheap method for detection of such molecules at ultra-low concentrations. It is based on the principle of boosting Raman signals, which have low intensity by nature, by utilising metal nanoparticles in order to enhance Raman signals by creating hot-spots. In this study Ag nanowires were synthesized, their crystal structure is characterized via XRD analysis, their surface morphology and radius are determined via SEM images and EDS analysis was performed for determining their chemical composition. Afterwards, rhodamine solutions which were prepared at 10-4 – 10-7 M was dropcasted onto Ag nanowire solutions. After selecting three characteristic Raman peaks belonging to the Rhodamine molecule, which are located at 612, 1189 and 1362 cm-1, detection of Rhodamine was performed at these ultra low concentrations. As a result, one can conclude that, Ag nanowires can be utilized as possible SERS substrates for detection of Rhodamine at low concentrations by exhibiting significant reproducibility, stability and recyclability.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139288688","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}

引用次数: 0

CONJUGATED LINOLEIC ACID AND FATTY ACID ISOMERS IN SELECTED COLD PRESSED OILS: ANALYSIS BY GC/FID TECHNIQUE 精选冷榨油中的共轭亚油酸和脂肪酸异构体：采用 GC/FID 技术进行分析

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-10-30 DOI: 10.18038/estubtda.1315013

Fatma Nur Arslan

{"title":"CONJUGATED LINOLEIC ACID AND FATTY ACID ISOMERS IN SELECTED COLD PRESSED OILS: ANALYSIS BY GC/FID TECHNIQUE","authors":"Fatma Nur Arslan","doi":"10.18038/estubtda.1315013","DOIUrl":"https://doi.org/10.18038/estubtda.1315013","url":null,"abstract":"The conjugated linoleic acid (CLA) isomers in cold pressed oils [pomegranate seed oil (PGSO), linseed oil (LSO), black cumin seed oil (BCSO), nettle seed oil (NSO),grape seed oil (GSO), sesame seed oil (SSO),safflower oil (SFO), pumpkin seed oil (PSO), wheat germ oil (WGO), fig seed oil (FSO), coriander oil (CO), walnut oil (WO) and coconut oil (CNO)] extracted with lab–scale screw press machine were further subjected to gas chromatography/flame ionization detection (GC/FID) analysis. The composition of polyunsaturated fatty acids (PUFAs), monounsaturated fatty acids (MUFA) and saturated fatty acids (SFAs) of the samples was also determined. The five different positional and geometric isomers of CLA [cis–9, cis–11 CLA, cis–9, trans–11 CLA, trans–9, cis–11 CLA, trans–9, trans–11 CLA and trans–10, cis–12 CLA] were also well separated by a highly polar column (100m×0.2μm×0.25mm i.d; HP–88 cyanopropyl) and an applied GC temperature program. It was concluded that the samples were all rich in total CLA (∑CLA) and they were found between 0.14% for PSO and 2.11% for SSO. The most abundant CLA isomer was in general to be cis–9, trans–11 CLA form, which represented the content of isomer between 3.15% and 72.08% of ∑CLA. Besides, the ∑SFA values were detected between 2.43% and 93.14%, ∑MUFA values were between 4.60% and 71.11% and ∑PUFA values were between 1.79% and 87.59%. Therefore, this study might offer valuable information for the introduction of new food sources, as well as incorporation into medicinal purposes and food formulations which have the potential to be commercially valuable.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139311264","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}

引用次数: 0

SYNTHESIS OF POLYMER ELECTROLYTE MEMBRANES BASED ON IONIC LIQUID DOPED SPEEK 基于离子液体掺杂 speek 的聚合物电解质膜的合成

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-10-12 DOI: 10.18038/estubtda.1236278

Şeyda Korkmaz, Mesut Yılmazoğlu

{"title":"SYNTHESIS OF POLYMER ELECTROLYTE MEMBRANES BASED ON IONIC LIQUID DOPED SPEEK","authors":"Şeyda Korkmaz, Mesut Yılmazoğlu","doi":"10.18038/estubtda.1236278","DOIUrl":"https://doi.org/10.18038/estubtda.1236278","url":null,"abstract":"The sustainable and environmentally benign energy demand of the world has been increasing. Among the various options, proton exchange membrane fuel cell is an attractive choice for energy supply due to its high efficiency and application conditions without waste. In this research, triazole-based ionic liquid doped sulfonated polyether ether ketone (SPEEK) composite membranes were presented for proton exchange membrane fuel cell (PEMFC) applications. Composite membranes were prepared by incorporating 1,2,3-triazole-based ionic liquids (TIL 1-2-3) into poly(ether ether ketone) (PEEK) matrices. The mechanical, structural, and thermal properties of both composite membranes and the triazole-based ionic liquids were thoroughly characterized using dynamic mechanical analysis (DMA), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The performance and viability of composites for PEMFC applications that involve elevated temperatures were conducted by proton conductivity test across a broad range of temperatures (30-180 oC). High-temperature proton conductivity was measured as 1.73x10-2 S/cm for SPEEK/TIL-3(1.0). According to the proton conductivity test results, it was concluded that the composite membranes may exhibit improved performance in PEMFC applications due to increased proton conductivity values.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139319840","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}

引用次数: 0

A NEW BIO-INSPIRED WING DESIGN WITH 3D ADDITIVE MANUFACTURING SCANNING AND PRINTING METHOD: MJF TECHNOLOGY 采用三维快速成型扫描和打印方法的新型生物启发式机翼设计：MJF 技术

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-09-29 DOI: 10.18038/estubtda.1269086

Neslihan Aydin

引用次数: 0

THE EFFECT OF SYNTHETIC FIBER TYPE ON FRESH, HARDENED AND TOUGHNESS PROPERTIES OF HSFR-SCC 合成纤维类型对hsfr-scc新鲜、硬化和韧性的影响

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-06-21 DOI: 10.18038/estubtda.1201120

Ceren Kina, Esma Balalan, K. Türk

{"title":"THE EFFECT OF SYNTHETIC FIBER TYPE ON FRESH, HARDENED AND TOUGHNESS PROPERTIES OF HSFR-SCC","authors":"Ceren Kina, Esma Balalan, K. Türk","doi":"10.18038/estubtda.1201120","DOIUrl":"https://doi.org/10.18038/estubtda.1201120","url":null,"abstract":"This study presents the experimental results about the effects of Polyvinyl-alcohol (PVA) and Polypropylene (PP) fibers on the fresh and mechanical properties including compressive, splitting tensile strength, modulus of rupture (MOR) as well as toughness of the hybrid fiber reinforced self-compacting concrete (SCC). PVA and PP fibers were added into SCC mixtures having only macro steel fiber and also having binary hybridization of both macro and micro steel fiber. The results showed that the use of micro steel fiber replaced by macro steel fiber improved the workability, compressive and splitting tensile strength, MOR and toughness and also caused reduction in the weight loss percentage compared to the use of only macro steel fiber. Moreover, it was emphasized that PVA or PP enhanced the residual flexural performance of SCC, generally, while it negatively influenced the workability and the residual strengths according to the use of single steel fiber and binary steel fiber hybridization. Compared to the effect of synthetic fibers, PP had slightly more positive effect in the view of workability while PVA enhanced the residual mechanical properties more.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128522336","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}

引用次数: 0

MODELLING OF DIFFERENT MOTHER WAVELET TRANSFORMS WITH ARTIFICIAL NEURAL NETWORKS FOR ESTIMATION OF SOLAR RADIATION 不同母小波变换在太阳辐射估计中的人工神经网络建模

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-06-21 DOI: 10.18038/estubtda.1184918

Kubra Kaysal, F. Hocaoglu

{"title":"MODELLING OF DIFFERENT MOTHER WAVELET TRANSFORMS WITH ARTIFICIAL NEURAL NETWORKS FOR ESTIMATION OF SOLAR RADIATION","authors":"Kubra Kaysal, F. Hocaoglu","doi":"10.18038/estubtda.1184918","DOIUrl":"https://doi.org/10.18038/estubtda.1184918","url":null,"abstract":"IIn recent years, the interest in renewable energy sources has increased due to environmental damage and, the increasing costs of fossil fuel resources, whose current reserves have decreased. Solar energy, an environmentally friendly, clean and sustainable energy source, is one of the most important renewable energy sources. The amount of electrical energy produced from solar energy largely depends on the intensity of solar radiation. For this reason, it is essential to know and accurately predict the characteristics of the solar radiation intensity of the relevant region for the healthy sustainability of the existing solar energy systems and the systems planned to be installed. For this purpose, a two-stage forecasting model was developed using the hourly solar radiation intensity of 2014 in a region in Turkey. In the first stage of the study, the second month of each season was selected to investigate the seasonal effects of the region and large, medium, and small-scale events in the study area were examined using discrete wavelet transform. The performances of different mother wavelets in the Artificial Neural Network model with Wavelet Transform (W-ANN) are compared in the second stage. July, the most successful estimation result in seasonal solar radiation intensity was obtained. The most successful RMSE values for January, April, July and October were 65,9471W/m^2, 74,3183 W/m^2, 54,3868 W/m^2, 78,4085 W/m^2 respectively, the coiflet mother wavelet measured it.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123330717","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}

引用次数: 0

CLINICAL DECISION SUPPORT SYSTEM FOR EARLY DIAGNOSIS OF HEART ATTACK USING MACHINE LEARNING METHODS 基于机器学习方法的心脏病早期诊断临床决策支持系统

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-06-21 DOI: 10.18038/estubtda.1025092

B. Kurt, İlknur BUÇAN KIKRBİR

{"title":"CLINICAL DECISION SUPPORT SYSTEM FOR EARLY DIAGNOSIS OF HEART ATTACK USING MACHINE LEARNING METHODS","authors":"B. Kurt, İlknur BUÇAN KIKRBİR","doi":"10.18038/estubtda.1025092","DOIUrl":"https://doi.org/10.18038/estubtda.1025092","url":null,"abstract":"Heart attack which is the main cause of death for both men and women is the leader among deaths due to heart diseases. Therefore, early diagnosis is very important for patients who are having a heart attack. Therefore, the study aimed to develop a clinical decision support system for the diagnosis of a heart attack to help physicians. In the study, variables were obtained accompanied by physicians by statistical analysis methods, where the optimum variables were selected from these variables considering the patient’s unconscious state in some cases. Different decision models were developed using probit regression, decision tree, SVM, and ANN methods. As a result, the developed clinical decision support models for heart attack diagnosis were compared and evaluated. Consequently, the best diagnosis model was obtained using ANN with selected variables. In addition to these, the proposed study is significantly noticed with a sensitivity of 98% and specificity of 93.7% for heart attack diagnosis with optimum variables compared to similar studies in the literature. By using the proposed decision support system, it is possible to determine whether a patient has a heart attack or not and help the physician in the process of diagnosis of a heart attack.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116807269","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}

引用次数: 0

USING INTUITIONISTIC FUZZY C-MEANS CLUSTERING ALGORITHMS TO MODEL COVID-19 CASES FOR COUNTRIES IN THE WORLDWIDE 采用直觉模糊c均值聚类算法对世界各国COVID-19病例进行建模

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-03-23 DOI: 10.18038/estubtda.1258361

N. İnce, Sevil Sentürk

{"title":"USING INTUITIONISTIC FUZZY C-MEANS CLUSTERING ALGORITHMS TO MODEL COVID-19 CASES FOR COUNTRIES IN THE WORLDWIDE","authors":"N. İnce, Sevil Sentürk","doi":"10.18038/estubtda.1258361","DOIUrl":"https://doi.org/10.18038/estubtda.1258361","url":null,"abstract":"Every day, the number of newly confirmed cases of coronavirus (COVID-19) rises in many countries. It is critical to adjust policies and plans in order to investigate the relationships between the distributions of the spread of this virus in other countries. During this study, the intuitionistic fuzzy c-means (IFCM) clustering method is used to compare and cluster the distributions of COVID-19 spread in 62 countries. Using the IFCM clustering algorithm, the study aims to cluster the countries that use environmental, economic, social, health, and related measurements that affect disease spread to implement policies that regulate disease spread. As a result, countries that have similar factors can take proactive measures to address the pandemic. The data are obtained for 62 countries, and six different feature variables (factors associated with the spread of COVID-19) are determined. The data are obtained for 62 countries, and six variables with different characteristics (linked to the spread of COVID-19) are identified. In this study, the IFCM clustering algorithm is used to determine the dynamic behavior of COVID-19 based on real-world data for multiple countries and Turkey around the world. Data analysis is performed through MATLAB 2018a and R programs. The clustering results revealed that the distribution of dissemination in Brazil, India, and the United States was nearly identical and distinct from that of the 59 other countries.","PeriodicalId":436776,"journal":{"name":"Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127281849","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}

引用次数: 0

QUARTZ FIBER RADOME AND SUBSTRATE FOR AEROSPACE APPLICATIONS 航空航天用石英光纤天线罩和衬底

Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering Pub Date : 2023-03-22 DOI: 10.18038/estubtda.1247951

Mete Bakir

引用次数: 1