Pub Date : 2024-06-14DOI: 10.16984/saufenbilder.1399655
Emine Baş
In this study, Mountain Gazelle Optimization (MGO) and Gazelle Optimization Algorithm (GOA) algorithms, which have been newly proposed in recent years, were examined. Although MGO and GOA are different heuristic algorithms, they are often considered the same algorithms by researchers. This study was conducted to resolve this confusion and demonstrate the discovery and exploitation success of both algorithms. While MGO developed the exploration and exploitation ability by being inspired by the behavior of gazelles living in different groups, GOA model was developed by being inspired by the behavior of gazelles in escaping from predators, reaching safe environments and grazing in safe environments. MGO and GOA were tested on 13 classical benchmark functions in seven different dimensions and their success was compared. According to the results, MGO is more successful than GOA in all dimensions. GOA, on the other hand, works faster than MGO. Additionally, MGO and GOA were tested on three different engineering design problems. While MGO was more successful in the tension/compression spring design problem and welded beam design problems, GOA achieved better results in the pressure vessel design problem. The results show that MGO improves the ability to explore and avoid local traps better than GOA. MGO and GOA are also compared with three different heuristic algorithms selected from the literature (GSO, COA, and ZOA). According to the results, MGO has shown that it can compete with new algorithms in the literature. GOA, on the other hand, lags behind comparison algorithms.
{"title":"A Detailed Comparison of Two New Heuristic Algorithms Based on Gazelles Behavior","authors":"Emine Baş","doi":"10.16984/saufenbilder.1399655","DOIUrl":"https://doi.org/10.16984/saufenbilder.1399655","url":null,"abstract":"In this study, Mountain Gazelle Optimization (MGO) and Gazelle Optimization Algorithm (GOA) algorithms, which have been newly proposed in recent years, were examined. Although MGO and GOA are different heuristic algorithms, they are often considered the same algorithms by researchers. This study was conducted to resolve this confusion and demonstrate the discovery and exploitation success of both algorithms. While MGO developed the exploration and exploitation ability by being inspired by the behavior of gazelles living in different groups, GOA model was developed by being inspired by the behavior of gazelles in escaping from predators, reaching safe environments and grazing in safe environments. MGO and GOA were tested on 13 classical benchmark functions in seven different dimensions and their success was compared. According to the results, MGO is more successful than GOA in all dimensions. GOA, on the other hand, works faster than MGO. Additionally, MGO and GOA were tested on three different engineering design problems. While MGO was more successful in the tension/compression spring design problem and welded beam design problems, GOA achieved better results in the pressure vessel design problem. The results show that MGO improves the ability to explore and avoid local traps better than GOA. MGO and GOA are also compared with three different heuristic algorithms selected from the literature (GSO, COA, and ZOA). According to the results, MGO has shown that it can compete with new algorithms in the literature. GOA, on the other hand, lags behind comparison algorithms.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"32 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141338901","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 : 2023-10-16DOI: 10.16984/saufenbilder.1225445
A. Şami̇l, E. Kuşvuran
In this work aromatic organochlorinated pesticides were first extracted from water using a solvent mixture (hexane:dichloromethane) and the quantities were then determined using a GC-MS fitted with an Electron Ionization (EI) and Selective Ion Monitoring (SIM) method. At the same time changes in the recovery ratios of spike levels were seen ranging from 73.6% to 96.1% (Chlorfenapyr). The recovery values that we found to be the lowest and greatest were 0.100 µg L-1 and 1.600 µg L-1 respectively. We also noticed that the Bromophos-ethyl, Bromophos-methyl and Chlorfenapyr pesticides had the lowest recovery efficiency. Additionally, the important values of pesticides with double benzene rings were detected in the following decreasing order: 4.4'-DDE > 4.4'-DDD > o.p'-DDE > Chlorfenapyr > 2.4'-DDD.
{"title":"Determination of Pesticide Residues in Water Using Extraction Method","authors":"A. Şami̇l, E. Kuşvuran","doi":"10.16984/saufenbilder.1225445","DOIUrl":"https://doi.org/10.16984/saufenbilder.1225445","url":null,"abstract":"In this work aromatic organochlorinated pesticides were first extracted from water using a solvent mixture (hexane:dichloromethane) and the quantities were then determined using a GC-MS fitted with an Electron Ionization (EI) and Selective Ion Monitoring (SIM) method. At the same time changes in the recovery ratios of spike levels were seen ranging from 73.6% to 96.1% (Chlorfenapyr). The recovery values that we found to be the lowest and greatest were 0.100 µg L-1 and 1.600 µg L-1 respectively. We also noticed that the Bromophos-ethyl, Bromophos-methyl and Chlorfenapyr pesticides had the lowest recovery efficiency. Additionally, the important values of pesticides with double benzene rings were detected in the following decreasing order: 4.4'-DDE > 4.4'-DDD > o.p'-DDE > Chlorfenapyr > 2.4'-DDD.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318835","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 : 2023-10-06DOI: 10.16984/saufenbilder.1241012
Semih Cengi̇z, Mehmet Şen, Muciz Özcan
With the increase in population in cities, the number of solid waste to be collected has also increased. Because the garbage collection route must be traveled repeatedly, even minor improvements in these routes can result in a significant increase in fuel usage. Shortening the journey would provide a significant contribution to lowering fuel expenses in all towns, especially given the rising cost of fossil fuels. Furthermore, lowering fuel usage is critical for Turkey to meet its national objectives under the Paris Agreement. The Simulated Annealing (SA) algorithm, one of the heuristic optimization techniques used to identify the best solutions to complicated problems, is employed to solve the routing problem of solid waste collection vehicles in this study. This method, which was inspired by the metal annealing process, stands out for its ability to avoid regional minima while looking for the optimal solution. The applicant region was selected as the Kosova Neighborhood of Konya's Selçuklu District. The container distances needed for the method to execute were acquired by extracting the coordinates of the containers. Kosova Neighborhood was separated into 7 distinct regions due to the restricted capacity of rubbish collection vans. All regions were analyzed independently, and the best feasible routes were estimated using the SA algorithm approach, and the results were compared to the greedy algorithm findings. The SA algorithm outperformed the greedy algorithm by 26.49%.
随着城市人口的增加，需要收集的固体垃圾数量也在增加。由于垃圾收集路线必须反复穿行，因此即使对这些路线稍作改进，也会导致燃料使用量大幅增加。特别是在化石燃料成本不断上涨的情况下，缩短路程将大大有助于降低所有城镇的燃料支出。此外，降低燃料使用量对于土耳其实现《巴黎协定》规定的国家目标至关重要。模拟退火（SA）算法是用于确定复杂问题最佳解决方案的启发式优化技术之一，本研究采用该算法来解决固体废物收集车辆的路由问题。该方法受金属退火过程的启发，在寻找最优解的过程中能够避免区域性最小值，因而脱颖而出。申请区域被选定为科尼亚塞尔丘克鲁区的科索瓦居民区。通过提取集装箱的坐标，获得了执行该方法所需的集装箱距离。由于垃圾收集车的容量有限，Kosova 街区被划分为 7 个不同的区域。对所有区域进行了独立分析，并使用 SA 算法方法估算了最佳可行路线，将结果与贪婪算法结果进行了比较。SA算法的结果比贪婪算法的结果高出26.49%。
{"title":"Developing an optimization model for minimizing solid waste collection costs","authors":"Semih Cengi̇z, Mehmet Şen, Muciz Özcan","doi":"10.16984/saufenbilder.1241012","DOIUrl":"https://doi.org/10.16984/saufenbilder.1241012","url":null,"abstract":"With the increase in population in cities, the number of solid waste to be collected has also increased. Because the garbage collection route must be traveled repeatedly, even minor improvements in these routes can result in a significant increase in fuel usage. Shortening the journey would provide a significant contribution to lowering fuel expenses in all towns, especially given the rising cost of fossil fuels. Furthermore, lowering fuel usage is critical for Turkey to meet its national objectives under the Paris Agreement. The Simulated Annealing (SA) algorithm, one of the heuristic optimization techniques used to identify the best solutions to complicated problems, is employed to solve the routing problem of solid waste collection vehicles in this study. This method, which was inspired by the metal annealing process, stands out for its ability to avoid regional minima while looking for the optimal solution. The applicant region was selected as the Kosova Neighborhood of Konya's Selçuklu District. The container distances needed for the method to execute were acquired by extracting the coordinates of the containers. Kosova Neighborhood was separated into 7 distinct regions due to the restricted capacity of rubbish collection vans. All regions were analyzed independently, and the best feasible routes were estimated using the SA algorithm approach, and the results were compared to the greedy algorithm findings. The SA algorithm outperformed the greedy algorithm by 26.49%.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"161 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139322414","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 : 2023-10-03DOI: 10.16984/saufenbilder.1250945
Aykut ILGAZ, Mehmet BAYIRLI
In this paper, the internal structure and dielectric properties of unsaturated polyester resin-based neat and single-walled carbon nanotube reinforced composites were comprehensively evaluated with the fractal analysis using the Fast Fourier Transform (FFT). The greyscale images, bitmap (BMP) images and 3D tomographic images were obtained by converting the scanning electron microscope images of the materials. It was observed that the distributions of components in the resin for both materials are irregular and their surfaces exhibit anisotropic behaviors. The surface coating rate (SCR) and fractal dimensionality (FD) of the materials were also calculated using the power spectrum. It has been observed that the fractal dimensionality of the composites can be changed by the doping process and the fractalization of the nanotube doped sample increases compared to the pure material due to nanotube agglomeration, spatial distribution and the orientation. The increase in fractalization as a result of this agglomeration and orientation in carbon nanotubes explains the high dielectric constant values observed at low frequencies by increasing the number and size of carbon nanotubes clusters that act as micro capacitors in certain regions of the matrix. It has been reported that the calculations for the surface coverage ratios for both samples also support these results.
{"title":"Fractal Approach to Dielectric Properties of Single Walled Carbon Nanotubes Reinforced Polymer Composites","authors":"Aykut ILGAZ, Mehmet BAYIRLI","doi":"10.16984/saufenbilder.1250945","DOIUrl":"https://doi.org/10.16984/saufenbilder.1250945","url":null,"abstract":"In this paper, the internal structure and dielectric properties of unsaturated polyester resin-based neat and single-walled carbon nanotube reinforced composites were comprehensively evaluated with the fractal analysis using the Fast Fourier Transform (FFT). The greyscale images, bitmap (BMP) images and 3D tomographic images were obtained by converting the scanning electron microscope images of the materials. It was observed that the distributions of components in the resin for both materials are irregular and their surfaces exhibit anisotropic behaviors. The surface coating rate (SCR) and fractal dimensionality (FD) of the materials were also calculated using the power spectrum. It has been observed that the fractal dimensionality of the composites can be changed by the doping process and the fractalization of the nanotube doped sample increases compared to the pure material due to nanotube agglomeration, spatial distribution and the orientation. The increase in fractalization as a result of this agglomeration and orientation in carbon nanotubes explains the high dielectric constant values observed at low frequencies by increasing the number and size of carbon nanotubes clusters that act as micro capacitors in certain regions of the matrix. It has been reported that the calculations for the surface coverage ratios for both samples also support these results.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135743648","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 : 2023-10-03DOI: 10.16984/saufenbilder.1339199
Fadime Canbolat, Nihan AKINCI KENANOĞLU, Tuğba Nurcan Yüksel, A. A. Berber
Valproic acid (VPA) is among the most commonly used antiepileptic drugs in childhood and adult epilepsy. Antioxidants can reverse drugs' toxic and genotoxic effects. Therefore, our study is aimed to evaluate the antigenotoxic protective effect of quercetin (QUE) against VPA genotoxicity by in vitro comet assay analysis method. Comet assay analysis was performed in 5 different groups. Group I; negative control (Sterile H2O), Group II; positive control (H2O2), Group III; VPA was applied in four different dose ranges, Group IV; QUE was applied in four different dose ranges, Group V; For the simultaneous combined administration of VPA and QUE, three different doses of VPA + Four different doses of QUE were administered. Low-dose administration of QUE was more effective in ameliorating the damage caused by low-dose VPA (62.5 μg/ml) administration. It is seen that the genotoxic damage caused by the application of 125 μg/ml VPA can be eliminated by QUE at all doses. It was determined that different doses of QUE exhibited a significant antigenotoxic effect against damage caused by 125 µg/mL VPA (P
丙戊酸（VPA）是治疗儿童和成人癫痫最常用的抗癫痫药物之一。抗氧化剂可以逆转药物的毒性和基因毒性作用。因此，我们的研究旨在通过体外彗星试验分析方法，评估槲皮素（QUE）对 VPA 基因毒性的抗原毒性保护作用。彗星试验分析在 5 个不同的组中进行。第一组；阴性对照组（无菌 H2O）；第二组；阳性对照组（H2O2）；第三组；VPA 四种不同剂量范围；第四组；QUE 四种不同剂量范围；第五组；VPA 和 QUE 同时联合给药，三种不同剂量的 VPA + 四种不同剂量的 QUE。低剂量 QUE 能更有效地改善低剂量 VPA（62.5 μg/ml）造成的损害。由此可见，施用 125 μg/ml VPA 所造成的基因毒性损伤在所有剂量下都能被 QUE 消除。经测定，不同剂量的 QUE 对 125 μg/ml VPA 所造成的损伤有显著的抗原毒性作用（P＜0.05）。
{"title":"Evaluation of the Antigenotoxic Effect of Quercetin Against Antiepileptic Drug Genotoxicity by Comet Analysis","authors":"Fadime Canbolat, Nihan AKINCI KENANOĞLU, Tuğba Nurcan Yüksel, A. A. Berber","doi":"10.16984/saufenbilder.1339199","DOIUrl":"https://doi.org/10.16984/saufenbilder.1339199","url":null,"abstract":"Valproic acid (VPA) is among the most commonly used antiepileptic drugs in childhood and adult epilepsy. Antioxidants can reverse drugs' toxic and genotoxic effects. Therefore, our study is aimed to evaluate the antigenotoxic protective effect of quercetin (QUE) against VPA genotoxicity by in vitro comet assay analysis method. Comet assay analysis was performed in 5 different groups. Group I; negative control (Sterile H2O), Group II; positive control (H2O2), Group III; VPA was applied in four different dose ranges, Group IV; QUE was applied in four different dose ranges, Group V; For the simultaneous combined administration of VPA and QUE, three different doses of VPA + Four different doses of QUE were administered. Low-dose administration of QUE was more effective in ameliorating the damage caused by low-dose VPA (62.5 μg/ml) administration. It is seen that the genotoxic damage caused by the application of 125 μg/ml VPA can be eliminated by QUE at all doses. It was determined that different doses of QUE exhibited a significant antigenotoxic effect against damage caused by 125 µg/mL VPA (P","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139323884","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 : 2023-09-27DOI: 10.16984/saufenbilder.1342645
Birkan Durak, Hasan Ömür Özer, Aziz Sezgi̇n, Lütfi Emir Sakman
A large variety of new methods are being developed for fast and efficient solutions of nonlinear boundary value problems. Some of these methods are, Adomian decomposition (ADM), differential transform (DTM), least squares vector machines (LSSVMM), and multiple variational iteration (MVIM). A natural question arises as to how efficient and simple to use these newer methods are compared to classical methods. One of the simplest and widely applicable classical methods is the collocation method. The overall performance of collocation method and the newer methods are compared on a number of problems, which were previously used to benchmark the newer methods. It is concluded that, at least for the problems considered, the collocation method performs as successfully as the newer methods.
{"title":"Approximate solutions of nonlinear boundary value problems by collocation methods compared to newer methods.","authors":"Birkan Durak, Hasan Ömür Özer, Aziz Sezgi̇n, Lütfi Emir Sakman","doi":"10.16984/saufenbilder.1342645","DOIUrl":"https://doi.org/10.16984/saufenbilder.1342645","url":null,"abstract":"A large variety of new methods are being developed for fast and efficient solutions of nonlinear boundary value problems. Some of these methods are, Adomian decomposition (ADM), differential transform (DTM), least squares vector machines (LSSVMM), and multiple variational iteration (MVIM). A natural question arises as to how efficient and simple to use these newer methods are compared to classical methods. One of the simplest and widely applicable classical methods is the collocation method. The overall performance of collocation method and the newer methods are compared on a number of problems, which were previously used to benchmark the newer methods. It is concluded that, at least for the problems considered, the collocation method performs as successfully as the newer methods.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"195 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335303","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 : 2023-09-26DOI: 10.16984/saufenbilder.1292075
Munyaradzı Gondobwe, Aydın Demir
In this study, a numerical progressive collapse response evaluation was performed on a 40-story high-rise building designed according to the Turkish Earthquake Code of 2018 (TEC 2018). The alternate path method specified in the General Services Administration of 2016 (GSA-2016) and the Unified Facilities Criteria (UFC 4-023-03) was used for the evaluation. A total of 18 scenarios were investigated for column and shear wall removals. In the cases where hinges were observed, the extent of damage was evaluated using the performance criteria given in the Turkish Seismic Code and the American Society of Civil Engineers (ASCE) 41-17. In this study, the most damage was observed when the corner column was removed at the bottom floor, while the least damage was observed on the shear walls close to the center and core of the building. For all the scenarios evaluated, no collapse was observed. The study showed that the high-rise buildings designed according to TEC-2018 have sufficient resistance to progressive collapse.
{"title":"Progressive Collapse Evaluation of a Reinforced Concrete High-rise Building Designed According to Turkish Earthquake Code","authors":"Munyaradzı Gondobwe, Aydın Demir","doi":"10.16984/saufenbilder.1292075","DOIUrl":"https://doi.org/10.16984/saufenbilder.1292075","url":null,"abstract":"In this study, a numerical progressive collapse response evaluation was performed on a 40-story high-rise building designed according to the Turkish Earthquake Code of 2018 (TEC 2018). The alternate path method specified in the General Services Administration of 2016 (GSA-2016) and the Unified Facilities Criteria (UFC 4-023-03) was used for the evaluation. A total of 18 scenarios were investigated for column and shear wall removals. In the cases where hinges were observed, the extent of damage was evaluated using the performance criteria given in the Turkish Seismic Code and the American Society of Civil Engineers (ASCE) 41-17. In this study, the most damage was observed when the corner column was removed at the bottom floor, while the least damage was observed on the shear walls close to the center and core of the building. For all the scenarios evaluated, no collapse was observed. The study showed that the high-rise buildings designed according to TEC-2018 have sufficient resistance to progressive collapse.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"97 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335805","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 : 2023-09-26DOI: 10.16984/saufenbilder.1340863
V. Ugraskan
The TE characteristics of polyvinyl alcohol/poly (3,4-ethylenedioxy thiophene)/titanium carbide (PVA/PEDOT/TiC) composites were explored in this work. The composite films with varying TiC weight ratios were made using the solvent casting process. The homogeneous distribution of TiC particles in the composite structure was revealed by SEM micrographs. The presence of TiC particles in the crystallinity of PVA/PEDOT was revealed by XRD patterns. The electrostatic interactions in the composite structure were revealed by FTIR-ATR studies. The electrical conductivity of PVA/PEDOT rose from 0.06 S/cm to 1.15 S/cm with the contribution of 5% TiC, while the Seebeck coefficient increased from 3.9 µV/K to 98.8 µV/K with the contribution of 1% TiC, according to TE studies. The composite samples exhibited a maximum power factor of 0.72 µW/mK2, which is 104 times greater compared to PVA/PEDOT.
{"title":"Thermoelectric Properties of Flexible Polyvinyl Alcohol/Poly (3,4-Ethylenedioxy thiophene)/Titanium Carbide Ternary Composites","authors":"V. Ugraskan","doi":"10.16984/saufenbilder.1340863","DOIUrl":"https://doi.org/10.16984/saufenbilder.1340863","url":null,"abstract":"The TE characteristics of polyvinyl alcohol/poly (3,4-ethylenedioxy thiophene)/titanium carbide (PVA/PEDOT/TiC) composites were explored in this work. The composite films with varying TiC weight ratios were made using the solvent casting process. The homogeneous distribution of TiC particles in the composite structure was revealed by SEM micrographs. The presence of TiC particles in the crystallinity of PVA/PEDOT was revealed by XRD patterns. The electrostatic interactions in the composite structure were revealed by FTIR-ATR studies. The electrical conductivity of PVA/PEDOT rose from 0.06 S/cm to 1.15 S/cm with the contribution of 5% TiC, while the Seebeck coefficient increased from 3.9 µV/K to 98.8 µV/K with the contribution of 1% TiC, according to TE studies. The composite samples exhibited a maximum power factor of 0.72 µW/mK2, which is 104 times greater compared to PVA/PEDOT.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"2016 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335861","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 : 2023-09-25DOI: 10.16984/saufenbilder.1308329
Mehmet Şafak Baran, O. H. Mete
Machining method is the most commonly used manufacturing method in the industry. The product, which is chipped on the raw material with the help of a cutting tool is finalized. The energy required in all these processes is provided by CNC machines. The manufactured product must be within the dimensional and geometric tolerances determined by the designer in order to discharge its functionality. In addition to these tolerances, surface quality is expected especially for powertrains, linear guides, pistons, sealing surfaces, control gauges. In this study, the effect of the process parameters on the surface quality of the milling operation, which is the most commonly used machining method was investigated as experimentally. GG25 cast iron material was used as test material. Experimental design was carried out by using Taguchi L18 orthogonal array and the effect of four process parameters on the surface quality was investigated. ANOVA was carried out in order to investigate the effect of process parameters on experiment results and their statistical significance. The validity of experimental model was investigated by comparing the actual experimental results with the estimated results obtained by Minitab 19. Actual experiment results were converted to S/N ratios by using Taguchi’s smaller is better function and optimum levels of each process parameter on the surface quality were determined.
{"title":"Investigation of Effect of Machining Process Parameters on Surface Quality","authors":"Mehmet Şafak Baran, O. H. Mete","doi":"10.16984/saufenbilder.1308329","DOIUrl":"https://doi.org/10.16984/saufenbilder.1308329","url":null,"abstract":"Machining method is the most commonly used manufacturing method in the industry. The product, which is chipped on the raw material with the help of a cutting tool is finalized. The energy required in all these processes is provided by CNC machines. The manufactured product must be within the dimensional and geometric tolerances determined by the designer in order to discharge its functionality. In addition to these tolerances, surface quality is expected especially for powertrains, linear guides, pistons, sealing surfaces, control gauges. In this study, the effect of the process parameters on the surface quality of the milling operation, which is the most commonly used machining method was investigated as experimentally. GG25 cast iron material was used as test material. Experimental design was carried out by using Taguchi L18 orthogonal array and the effect of four process parameters on the surface quality was investigated. ANOVA was carried out in order to investigate the effect of process parameters on experiment results and their statistical significance. The validity of experimental model was investigated by comparing the actual experimental results with the estimated results obtained by Minitab 19. Actual experiment results were converted to S/N ratios by using Taguchi’s smaller is better function and optimum levels of each process parameter on the surface quality were determined.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"128 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139336039","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 : 2023-09-18DOI: 10.16984/saufenbilder.1302803
Abdullah ŞENER, Burhan ERGEN
Early detection and diagnosis of brain tumors have a critical impact on the treatment of brain tumor patients. This is because initiating interventions early directly impacts the patient's chances of continuing their life. In the field of medical research, various methods are employed for the detection of brain tumors. Among these methods, magnetic resonance imaging (MRI) is the most popular due to its superior image quality. By leveraging technological advancements, the utilization of deep learning techniques in the identification of brain tumors ensures both high accuracy and simplification of the process. In a conducted study, a new model was developed by utilizing the VGG-19 architecture, a popular convolutional neural network model, to achieve high accuracy in brain tumor detection. In the study, precision, F1 score, accuracy, specificity, Matthews correlation coefficient, and recall metrics were used to evaluate the performance of the developed model. The deep learning model developed for brain tumor detection was trained and evaluated on an open-source dataset consisting of MRI images of gliomas, meningiomas, pituitary tumors, and healthy brains. The results obtained from the study demonstrate the promising potential of using the developed model in clinical applications for brain tumor detection. The high accuracy achieved by the developed model emphasizes its potential as an auxiliary resource for healthcare professionals in brain tumor detection. This research aims to evaluate the model as a valuable tool that can assist physicians in making informed treatment decisions regarding brain tumor diagnosis.
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