Pub Date : 2024-03-23DOI: 10.17350/hjse19030000329
Mohammed Ali Mohammed Mohammed, Fuat Türk
Cryptocurrencies have revolutionized the financial landscape by providing decentralized and anonymous payment systems, making them an intriguing subject for investors and researchers. This article delves into applying machine learning techniques for predicting cryptocurrency prices, mainly focusing on Bitcoin, Ethereum, and Binance Coin. Employing a range of machine learning models, including XGBoost, Linear Regression, and Gaussian Processes, the study aims to evaluate their predictive performance comprehensively. The results are promising; our models outperform existing studies, achieving impressively low RMSE values of 0.0040 for Bitcoin, 0.028 for Ethereum, and 0.027 for Binance Coin. These findings contribute valuable insights into the volatility and dynamics of cryptocurrency prices and underscore the potential of machine learning in shaping financial decision-making. Future directions include integrating advanced deep learning models, additional data sources, and ensemble methods to enhance prediction accuracy and robustness.
{"title":"A Research: Investigation of Financial Applications with Blockchain Technology","authors":"Mohammed Ali Mohammed Mohammed, Fuat Türk","doi":"10.17350/hjse19030000329","DOIUrl":"https://doi.org/10.17350/hjse19030000329","url":null,"abstract":"Cryptocurrencies have revolutionized the financial landscape by providing decentralized and anonymous payment systems, making them an intriguing subject for investors and researchers. This article delves into applying machine learning techniques for predicting cryptocurrency prices, mainly focusing on Bitcoin, Ethereum, and Binance Coin. Employing a range of machine learning models, including XGBoost, Linear Regression, and Gaussian Processes, the study aims to evaluate their predictive performance comprehensively. The results are promising; our models outperform existing studies, achieving impressively low RMSE values of 0.0040 for Bitcoin, 0.028 for Ethereum, and 0.027 for Binance Coin. These findings contribute valuable insights into the volatility and dynamics of cryptocurrency prices and underscore the potential of machine learning in shaping financial decision-making. Future directions include integrating advanced deep learning models, additional data sources, and ensemble methods to enhance prediction accuracy and robustness.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":" 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140386833","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}
Pub Date : 2024-02-27DOI: 10.17350/hjse19030000327
Ebubekir Seyyarer, Faruk Ayata
With the impact of the COVID-19 outbreak, almost all scientists and nations began to show great interest in the subject for a long time. Studies in the field of outbreak, diagnosis and prevention are still ongoing. Issues such as methods developed to understand the spread mechanisms of the disease, prevention measures, vaccine and drug research are among the top priorities of the world agenda. The accuracy of the tests applied in the outbreak management has become extremely critical. In this study, it is aimed to obtain a function that finds the positive or negative COVID-19 test from the blood gas values of individuals by using Machine Learning methods to contribute to the outbreak management. Using the Multivariate Linear Regression (MLR) model, a linear function is obtained to represent the COVID-19 dataset taken from the Van province of Turkey. The data set obtained from Van Yüzüncü Yıl University Dursun Odabaş Medical Center consists of blood gas analysis samples (109 positive, 1146 negative) taken from individuals. It is thought that the linear function to be obtained by using these data will be an important method in determining the test results of individuals. Gradient Descent optimization methods are used to find the optimum values of the coefficients in the function to be obtained. In the study, the RMSProp optimization algorithm has a success rate of 58-91.23% in all measurement methods, and it is seen that it is much more successful than other optimization algorithms.
{"title":"COVID-19 Diagnosis from Blood Gas Using Multivariate Linear Regression","authors":"Ebubekir Seyyarer, Faruk Ayata","doi":"10.17350/hjse19030000327","DOIUrl":"https://doi.org/10.17350/hjse19030000327","url":null,"abstract":"With the impact of the COVID-19 outbreak, almost all scientists and nations began to show great interest in the subject for a long time. Studies in the field of outbreak, diagnosis and prevention are still ongoing. Issues such as methods developed to understand the spread mechanisms of the disease, prevention measures, vaccine and drug research are among the top priorities of the world agenda. The accuracy of the tests applied in the outbreak management has become extremely critical. In this study, it is aimed to obtain a function that finds the positive or negative COVID-19 test from the blood gas values of individuals by using Machine Learning methods to contribute to the outbreak management. Using the Multivariate Linear Regression (MLR) model, a linear function is obtained to represent the COVID-19 dataset taken from the Van province of Turkey. The data set obtained from Van Yüzüncü Yıl University Dursun Odabaş Medical Center consists of blood gas analysis samples (109 positive, 1146 negative) taken from individuals. It is thought that the linear function to be obtained by using these data will be an important method in determining the test results of individuals. Gradient Descent optimization methods are used to find the optimum values of the coefficients in the function to be obtained. In the study, the RMSProp optimization algorithm has a success rate of 58-91.23% in all measurement methods, and it is seen that it is much more successful than other optimization algorithms.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"30 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140425019","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}
Pub Date : 2024-02-22DOI: 10.17350/hjse19030000326
Selin Onay, Ömer Refet Çaylan, Zarife Göknur Büke, Itır Köymen
In recent years, there has been extensive research on the memristor, a non-volatile memory device that demonstrates effective emulation of biological synapses. The implementation of graphene as a top electrode in memristive switching systems presents an intriguing alternative to conventional materials such as Platinum. Graphene, as a carbon-derived material, possesses a remarkable area- to-volume ratio, biocompatibility, adsorption capabilities, and high electrical conductivity and thereby offers a promising avenue for the fabrication of biosensors with superior characteristics. This study reports a novel fabrication method of utilizing graphene as a top electrode in memristive devices. Characterization results of micrometric devices as well as larger memristive devices are also discussed. Larger devices show promising results to be used as memristive sensors. Microstructures have been fabricated successfully through developing a process flow and patterning graphene using photolithography and lift-off. E-beam evaporation and sputtering were used for depositing bottom metal electrodes and active layer respectively. Graphene was produced using the chemical vapor deposition (CVD) method and subsequently transferred using the fishing technique. Ultimately Pt/TiO2/TiOx/Graphene memristive devices were fabricated.
{"title":"A Fabrication Method for Memristors with Graphene Top Electrodes and their Characterization","authors":"Selin Onay, Ömer Refet Çaylan, Zarife Göknur Büke, Itır Köymen","doi":"10.17350/hjse19030000326","DOIUrl":"https://doi.org/10.17350/hjse19030000326","url":null,"abstract":"In recent years, there has been extensive research on the memristor, a non-volatile memory device that demonstrates effective emulation of biological synapses. The implementation of graphene as a top electrode in memristive switching systems presents an intriguing alternative to conventional materials such as Platinum. Graphene, as a carbon-derived material, possesses a remarkable area- to-volume ratio, biocompatibility, adsorption capabilities, and high electrical conductivity and thereby offers a promising avenue for the fabrication of biosensors with superior characteristics. This study reports a novel fabrication method of utilizing graphene as a top electrode in memristive devices. Characterization results of micrometric devices as well as larger memristive devices are also discussed. Larger devices show promising results to be used as memristive sensors. Microstructures have been fabricated successfully through developing a process flow and patterning graphene using photolithography and lift-off. E-beam evaporation and sputtering were used for depositing bottom metal electrodes and active layer respectively. Graphene was produced using the chemical vapor deposition (CVD) method and subsequently transferred using the fishing technique. Ultimately Pt/TiO2/TiOx/Graphene memristive devices were fabricated.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"7 4‐5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140438489","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}
Pub Date : 2024-01-22DOI: 10.17350/hjse19030000330
Halil Yılmaz, Bülent Alkan, Hasan Feyzi Budak
The deformation behavior of single crystals of manganese pillars generated by focused ion beam (FIB), with diameters ranging from ~1 m to ~4.5 m, has been studied as a function of specimen size using micropillar compression at ambient temperature. The manganese pillars were machined from randomly chosen larger grains of polycrystalline metal. At ambient temperature, single crystals of manganese display chaotic slip planes emerging on the sample surface and brittle plastic deformation when the sample size is decreased to the micrometer scale. The manganese pillars reached very high flow stresses in the range of 4-5.6 GPa. The stress-strain curves of all tested manganese pillars demonstrated significant work hardening and smooth flow behavior, with strains up to 8-10%. After 10% strain, however, the flow stresses remained constant with no work hardening. As previously reported, the manganese pillars with undetermined orientation demonstrated a less pronounced size effect (-0.14) by the size effect exponent of BCC pillars.
在环境温度下，使用微柱压缩技术研究了由聚焦离子束（FIB）产生的直径从 ~1 m 到 ~4.5 m 的锰柱单晶体的变形行为与试样尺寸的函数关系。锰柱是从随机选择的较大的多晶金属晶粒中加工出来的。在常温下，当试样尺寸减小到微米级时，锰的单晶体在试样表面显示出混乱的滑移面和脆性塑性变形。锰柱达到了非常高的流动应力，范围在 4-5.6 GPa 之间。所有测试锰柱的应力-应变曲线都显示出明显的加工硬化和平滑的流动行为，应变高达 8-10%。然而，应变达到 10%后，流动应力保持不变，没有加工硬化。如之前的报告所述，按 BCC 柱的尺寸效应指数计算，取向未定的锰柱的尺寸效应（-0.14）不太明显。
{"title":"Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars","authors":"Halil Yılmaz, Bülent Alkan, Hasan Feyzi Budak","doi":"10.17350/hjse19030000330","DOIUrl":"https://doi.org/10.17350/hjse19030000330","url":null,"abstract":"The deformation behavior of single crystals of manganese pillars generated by focused ion beam (FIB), with diameters ranging from ~1 m to ~4.5 m, has been studied as a function of specimen size using micropillar compression at ambient temperature. The manganese pillars were machined from randomly chosen larger grains of polycrystalline metal. At ambient temperature, single crystals of manganese display chaotic slip planes emerging on the sample surface and brittle plastic deformation when the sample size is decreased to the micrometer scale. The manganese pillars reached very high flow stresses in the range of 4-5.6 GPa. The stress-strain curves of all tested manganese pillars demonstrated significant work hardening and smooth flow behavior, with strains up to 8-10%. After 10% strain, however, the flow stresses remained constant with no work hardening. As previously reported, the manganese pillars with undetermined orientation demonstrated a less pronounced size effect (-0.14) by the size effect exponent of BCC pillars.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"72 5-6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140499063","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}
Pub Date : 2023-12-04DOI: 10.17350/hjse19030000323
Dilek Şenol Arslan, Hasan Hacifazlioğlu
This study explores the potential use of waste cooking sunflower oil (WSO) as an eco-friendly collector for coal slime flotation. WSO and coal slime are both wastes and are hazardous to human health and the environment, if not disposed of properly. In this study, co-disposal of the two wastes was investigated; a gas oil (petroleum derived oil) and crude sunflower oil (CSO) were used for collector efficiency comparisons. This study also presents a green, low-cost and environmentally friendly alternative. Kinetic flotation tests were carried out to study the flotation selectivity, flammability and combustible recovery. Contact angle measurements were performed with 3 different oils (CSO, WSO and gas oil) by sessile drop technique to determine the hydrophobicity and surface properties of coal. Fourier-transform infrared (FTIR) spectroscopy was utilized to analyze the chemical composition of both waste oil and coal samples. Keywords: Sunflower oil, waste cooking oil, gas oil, coal slime, flotation
{"title":"Performance Comparison of Waste Cooking Oil on Coal Slime Flotation with Sunflower Oil and Gas Oil","authors":"Dilek Şenol Arslan, Hasan Hacifazlioğlu","doi":"10.17350/hjse19030000323","DOIUrl":"https://doi.org/10.17350/hjse19030000323","url":null,"abstract":"This study explores the potential use of waste cooking sunflower oil (WSO) as an eco-friendly collector for coal slime flotation. WSO and coal slime are both wastes and are hazardous to human health and the environment, if not disposed of properly. In this study, co-disposal of the two wastes was investigated; a gas oil (petroleum derived oil) and crude sunflower oil (CSO) were used for collector efficiency comparisons. This study also presents a green, low-cost and environmentally friendly alternative. Kinetic flotation tests were carried out to study the flotation selectivity, flammability and combustible recovery. Contact angle measurements were performed with 3 different oils (CSO, WSO and gas oil) by sessile drop technique to determine the hydrophobicity and surface properties of coal. Fourier-transform infrared (FTIR) spectroscopy was utilized to analyze the chemical composition of both waste oil and coal samples. \u0000Keywords: Sunflower oil, waste cooking oil, gas oil, coal slime, flotation","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138602926","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}
Pub Date : 2023-11-29DOI: 10.17350/hjse19030000318
Ü. Şafak, Hande Sonsun, Nusret Nurlu
The Dağpazarı village in the Mut (Mersin-S Turkey) region served as the main subject of the study and from the research area, 2 measured stratigraphic sections have been obtained. By analyzing the ostracod fauna of the Dağpazarı, Ballı and Mut Formations in these portions and using strontium isotope chemostratgraphic dating, the Middle-Late Miocene period in the area was thoroughly examined. The upper levels of the Mut/Köselerli formations, which are Burdigalian and Serravallian, mark the beginning of the Miocene succession in the research region. The Dağpazarı formation, which includes plentiful silty-clay, Ostrea fossiliferous, and lignite layers, is unconformably deposited just above these levels. This formation contains the following ostacode types; Bairdia subdeltoidea, C. glypta, Cytheridea acuminata acuminata, Acanthocythereis hystrix, Krithe monosteracensis, Neomonoceratina mouliana, Hemicyprideis sp., Cistacythereis caelatura, Cyherella terguemi, T. prava, K. langhiana, A. ulicznyi, Pokornyella deformis minor, Loxoconcha alata, Tenedocythere salebrosa. Furthermore, the planktonic foraminifera species are; O. universa, Globigerinoides trilobus, Glb. ruber, Orbulina bilobata, Glb. sacculifer, O. suturalis, and the formation includes abundant bryozoa, echinoid spines, gastropods such as Terebralia at distinct levels and fish otolith. The formation, which dates from the late Serravallian to the early Tortonian, exhibits the shallow reef character that continued to develop in the late Miocene. The formation consists of dark green, bulbous weathered claystone, Bairdia subdeltoidea and Ostrea which are reduced in size at the levels that pass into hard clayey sandstone, abundant benthic foraminifera with abundant echinide spines. The formation is made up of benthic foraminifera, hard clayey sandstone, and weathered dark green claystone with a lot of echinide spines. Ostrea and Bairdia subdeltoidea are also present. The superior section of the examined succession finishes with silty, hard, clayey limestone and light-colored limestone bands. The level, the Tırtar7Ballı formation, which is compatible with the Dağpazarı formation, indicates the top of a recent reef formation in the Tortonian. Ostracod species such as Aurila pigadiana, Thalmannia hodgii, Buntonia sublatissima dertonensis, Bairdia subdeltoidea, Aurila sp. B Bassiouni have been defined. The limestones furthermore include abundant benthic foraminifera and echinoid spines. The ratio of 87Sr/86Sr analyzed from the carbonate sample obtained from the Dağpazarı formation is 0.708920. The age of the Dağpazarı formation was calculated as 8.7 Ma based on these isotope data.
{"title":"Strontium isotopic, Ostracod fauna, and paleoenvironmental features of the Late Miocene sequence in Mut/Dağpazarı region (Southern Turkey)","authors":"Ü. Şafak, Hande Sonsun, Nusret Nurlu","doi":"10.17350/hjse19030000318","DOIUrl":"https://doi.org/10.17350/hjse19030000318","url":null,"abstract":"The Dağpazarı village in the Mut (Mersin-S Turkey) region served as the main subject of the study and from the research area, 2 measured stratigraphic sections have been obtained. By analyzing the ostracod fauna of the Dağpazarı, Ballı and Mut Formations in these portions and using strontium isotope chemostratgraphic dating, the Middle-Late Miocene period in the area was thoroughly examined. The upper levels of the Mut/Köselerli formations, which are Burdigalian and Serravallian, mark the beginning of the Miocene succession in the research region. The Dağpazarı formation, which includes plentiful silty-clay, Ostrea fossiliferous, and lignite layers, is unconformably deposited just above these levels. This formation contains the following ostacode types; Bairdia subdeltoidea, C. glypta, Cytheridea acuminata acuminata, Acanthocythereis hystrix, Krithe monosteracensis, Neomonoceratina mouliana, Hemicyprideis sp., Cistacythereis caelatura, Cyherella terguemi, T. prava, K. langhiana, A. ulicznyi, Pokornyella deformis minor, Loxoconcha alata, Tenedocythere salebrosa. Furthermore, the planktonic foraminifera species are; O. universa, Globigerinoides trilobus, Glb. ruber, Orbulina bilobata, Glb. sacculifer, O. suturalis, and the formation includes abundant bryozoa, echinoid spines, gastropods such as Terebralia at distinct levels and fish otolith. The formation, which dates from the late Serravallian to the early Tortonian, exhibits the shallow reef character that continued to develop in the late Miocene. The formation consists of dark green, bulbous weathered claystone, Bairdia subdeltoidea and Ostrea which are reduced in size at the levels that pass into hard clayey sandstone, abundant benthic foraminifera with abundant echinide spines. The formation is made up of benthic foraminifera, hard clayey sandstone, and weathered dark green claystone with a lot of echinide spines. Ostrea and Bairdia subdeltoidea are also present. The superior section of the examined succession finishes with silty, hard, clayey limestone and light-colored limestone bands. The level, the Tırtar7Ballı formation, which is compatible with the Dağpazarı formation, indicates the top of a recent reef formation in the Tortonian. Ostracod species such as Aurila pigadiana, Thalmannia hodgii, Buntonia sublatissima dertonensis, Bairdia subdeltoidea, Aurila sp. B Bassiouni have been defined. The limestones furthermore include abundant benthic foraminifera and echinoid spines. The ratio of 87Sr/86Sr analyzed from the carbonate sample obtained from the Dağpazarı formation is 0.708920. The age of the Dağpazarı formation was calculated as 8.7 Ma based on these isotope data.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212562","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}
Pub Date : 2023-11-28DOI: 10.17350/hjse19030000322
Çağrıalp Arslan, Ümit Tayfun, Mehmet Dogan
The surface contact between the polymer and the mineral additive is one of the most significant aspects influencing the efficiency of mineral-filled polymeric composites. In this work, three distinct compatibilizers were introduced to composites based on polypropylene (PP) and perlite to improve interactions between the constituents. On composites comprising 10% expanded perlite content, three different ratios of ethylene vinyl acetate copolymer (EVA), thermoplastic polyurethane elastomer (TPU), and maleic anhydride grafted polypropylene (MA-PP) compatibilizers were employed. The composite was produced using an approach designated melt blending followed by injection molding. The composites containing MA-PP compatibilizer possessed the most outstanding performance, according to the results of mechanical, physical, and dynamic mechanical evaluations and morphological characterizations. The investigated aspects indicated a rise in the composites containing 10 percent compatibilizer with the lowest adding amount, whereas performances declined at high compatibilizer contents. Along with these results, it was determined that the compatibilizers included in the PP/perlite composite system assisted in the fabrication of the composites by promoting the force values and melt flow rates identified during melt mixing. Following the test outcomes, MA-PP performed better than TPU and EVA in terms of compatibilizer efficiency. In general, it has been revealed that the selection of MA-PP compatibilizer in the manufacturing stages would offer benefits in terms of both simplicity of processing and mechanical strength where expanded perlite will be adopted as a natural filler for PP-based composites.
{"title":"Optimizing perlite-polymer ınterface interactions in composites based on polypropylene via the utilization of several compatibilizers","authors":"Çağrıalp Arslan, Ümit Tayfun, Mehmet Dogan","doi":"10.17350/hjse19030000322","DOIUrl":"https://doi.org/10.17350/hjse19030000322","url":null,"abstract":"The surface contact between the polymer and the mineral additive is one of the most significant aspects influencing the efficiency of mineral-filled polymeric composites. In this work, three distinct compatibilizers were introduced to composites based on polypropylene (PP) and perlite to improve interactions between the constituents. On composites comprising 10% expanded perlite content, three different ratios of ethylene vinyl acetate copolymer (EVA), thermoplastic polyurethane elastomer (TPU), and maleic anhydride grafted polypropylene (MA-PP) compatibilizers were employed. The composite was produced using an approach designated melt blending followed by injection molding. The composites containing MA-PP compatibilizer possessed the most outstanding performance, according to the results of mechanical, physical, and dynamic mechanical evaluations and morphological characterizations. The investigated aspects indicated a rise in the composites containing 10 percent compatibilizer with the lowest adding amount, whereas performances declined at high compatibilizer contents. Along with these results, it was determined that the compatibilizers included in the PP/perlite composite system assisted in the fabrication of the composites by promoting the force values and melt flow rates identified during melt mixing. Following the test outcomes, MA-PP performed better than TPU and EVA in terms of compatibilizer efficiency. In general, it has been revealed that the selection of MA-PP compatibilizer in the manufacturing stages would offer benefits in terms of both simplicity of processing and mechanical strength where expanded perlite will be adopted as a natural filler for PP-based composites.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139219328","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}
Pub Date : 2023-11-17DOI: 10.17350/hjse19030000324
Ahmet Elbir
The rapid increase in consumer societies means an increase in waste facilities. Especially considering the amount of power used in waste plants and the corresponding amount of waste heat, an approach to recover waste heat in these plants has been proposed. The waste heat from the solid waste facility was first evaluated in the rankine cycle. An ORC system has been added to the lower cycle of the steam rankine cycle. The integrated system was completed by adding the waste heat from the Rankin steam cycle to the carbon dioxide cycle. These power generating systems are designed with two turbines each with gradual expansion. 1 kg/s of air at 873.2 K was obtained by evaluating the waste heat with sub-cycles. In terms of energy efficiency, it is seen that the R744 cascade cycle has the highest energy and exergy efficiency. Cooling with water in heat exchangers reduces the exhaust efficiency. The mass flow requirement is highest in ORC, where R123 fluid is used. The energy efficiency for the entire system was calculated as 11.2% and the exergy efficiency for the entire system was calculated as 4%. When Exergo Environment Analysis was made, exergy stability factor was found to be 0.453, exergetic sustainability index was found to be 0.04 . There is also 370K waste heat. This is recommended for use in drying units. Calculations were made with the EES (Engineering Equation Solver) program.
{"title":"Thermodynamic Analysis of the Integrated System that Produces Energy by Gradual Expansion from the Waste Heat of the Solid Waste Facility","authors":"Ahmet Elbir","doi":"10.17350/hjse19030000324","DOIUrl":"https://doi.org/10.17350/hjse19030000324","url":null,"abstract":"The rapid increase in consumer societies means an increase in waste facilities. Especially considering the amount of power used in waste plants and the corresponding amount of waste heat, an approach to recover waste heat in these plants has been proposed. The waste heat from the solid waste facility was first evaluated in the rankine cycle. An ORC system has been added to the lower cycle of the steam rankine cycle. The integrated system was completed by adding the waste heat from the Rankin steam cycle to the carbon dioxide cycle. These power generating systems are designed with two turbines each with gradual expansion. 1 kg/s of air at 873.2 K was obtained by evaluating the waste heat with sub-cycles. In terms of energy efficiency, it is seen that the R744 cascade cycle has the highest energy and exergy efficiency. Cooling with water in heat exchangers reduces the exhaust efficiency. The mass flow requirement is highest in ORC, where R123 fluid is used. The energy efficiency for the entire system was calculated as 11.2% and the exergy efficiency for the entire system was calculated as 4%. When Exergo Environment Analysis was made, exergy stability factor was found to be 0.453, exergetic sustainability index was found to be 0.04 . There is also 370K waste heat. This is recommended for use in drying units. Calculations were made with the EES (Engineering Equation Solver) program.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"114 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139263112","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}
Pub Date : 2023-10-27DOI: 10.17350/hjse19030000319
F. Karaçam
Bending of a laminated composite beam under to a sinusoidal loading is carried out for simply support boundary condition for a specific cross-ply stacking sequence. To demonstrate the accuracy of the analytical results, a computer-aided engineering (CAE) approach is used. In the analytical solution, a unified shear deformation theory with a parabolic shape function is used. The longitudinal and vertical displacements, normal and shear stresses, namely, the bending stresses of analytical and CAE solutions are obtained and compared with the literature. Although two different methods are used in the study, the analysis results converge to the reference values. The variation of the displacements, normal and shear stresses are illustrated in the graphics with respect to the beam length and thickness respectively.
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Pub Date : 2023-10-24DOI: 10.17350/hjse19030000317
Gizem Bakir
For heat extraction in nuclear systems, interest in the design of nuclear reactors with heat pipes has increased. Determination of heat limitations is one of the the remarkable factors when heat pipes is used for nuclear systems. In this article, capillary and entrainment limit values for the heat pipe were calculated in a heat pipe reactor with potassium working fluid operating at 650 K. Five different effective porous radius (10.1x10-6, 10.225x10-6, 10.35x10-6, 10.425x10-6 and 10.6x10-6 m) and five different wick permeability (4.75x10-12, 5x10-12, 5.25x10-11, 5.5x10-12 and 5.75x10-12 m2) were considered for sintered copper wick heat pipe. While the effects of effective porosity radius, wick permeability, and wick radius on the capillary barrier were studied, only the effects of effective porosity radius were studied. The highest values of the capillary and entrainment limits were obtained when the porosity radius is 10.1x10-6 m. Besides, maximum capillary limits achieved when the wick permeability is 5.75x10-12 m2 and the wick radius.
为了在核系统中提取热量，人们对使用热管设计核反应堆的兴趣与日俱增。当热管用于核系统时，热量限制的确定是重要因素之一。本文计算了在 650 K 温度下使用钾工作流体的热管反应堆中热管的毛细管极限值和夹带极限值。1x10-6、10.225x10-6、10.35x10-6、10.425x10-6 和 10.6x10-6 m），并考虑了烧结铜芯热管的五种不同芯渗透率（4.75x10-12、5x10-12、5.25x10-11、5.5x10-12 和 5.75x10-12 m2）。虽然研究了有效孔隙半径、灯芯渗透率和灯芯半径对毛细管阻隔的影响，但只研究了有效孔隙半径的影响。当孔隙率半径为 10.1x10-6 m 时，毛细极限和夹带极限值最高。
{"title":"THE EFFECT OF WICK PERMEABILITY AND POROUS RADIUS ON CAPILLARY AND ENTRAINMENT LIMIT IN A HEAT PIPE REACTOR","authors":"Gizem Bakir","doi":"10.17350/hjse19030000317","DOIUrl":"https://doi.org/10.17350/hjse19030000317","url":null,"abstract":"For heat extraction in nuclear systems, interest in the design of nuclear reactors with heat pipes has increased. Determination of heat limitations is one of the the remarkable factors when heat pipes is used for nuclear systems. In this article, capillary and entrainment limit values for the heat pipe were calculated in a heat pipe reactor with potassium working fluid operating at 650 K. Five different effective porous radius (10.1x10-6, 10.225x10-6, 10.35x10-6, 10.425x10-6 and 10.6x10-6 m) and five different wick permeability (4.75x10-12, 5x10-12, 5.25x10-11, 5.5x10-12 and 5.75x10-12 m2) were considered for sintered copper wick heat pipe. While the effects of effective porosity radius, wick permeability, and wick radius on the capillary barrier were studied, only the effects of effective porosity radius were studied. The highest values of the capillary and entrainment limits were obtained when the porosity radius is 10.1x10-6 m. Besides, maximum capillary limits achieved when the wick permeability is 5.75x10-12 m2 and the wick radius.","PeriodicalId":285705,"journal":{"name":"Hittite Journal of Science and Engineering","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139314872","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}
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