Pub Date : 2021-06-16DOI: 10.22531/muglajsci.925192
B. Pişkin
{"title":"EFFECT of SYNTHESIS PARAMETERS on the STRUCTURAL STABILITY of La1-xCaxMnyAl1-y (LCMA)","authors":"B. Pişkin","doi":"10.22531/muglajsci.925192","DOIUrl":"https://doi.org/10.22531/muglajsci.925192","url":null,"abstract":"","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047741","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 : 2021-06-15DOI: 10.22531/muglajsci.886688
Derya Tatman, G. K. Günaydin
{"title":"NATURAL DYEING OF WOVEN FABRICS WITH EXTRACTS OF WALNUT, ACORN SHELL AND ONION SKIN: A STEP TOWARDS SUSTAINABLE TEXTILE","authors":"Derya Tatman, G. K. Günaydin","doi":"10.22531/muglajsci.886688","DOIUrl":"https://doi.org/10.22531/muglajsci.886688","url":null,"abstract":"","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116354711","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 : 2021-06-11DOI: 10.22531/muglajsci.852180
Fatma Almaz, M. Kulahci
{"title":"THE RESEARCH ON NORMAL CURVES IN THE SEMI-EUCLIDEAN SPACE E4 2","authors":"Fatma Almaz, M. Kulahci","doi":"10.22531/muglajsci.852180","DOIUrl":"https://doi.org/10.22531/muglajsci.852180","url":null,"abstract":"","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131194850","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 : 2021-05-10DOI: 10.22531/MUGLAJSCI.901966
Mutlu Tekir, Mutlucan Bayat, K. Arslan
This study presents energy, entropy, and exergy analyses of Al2O3-Cu/water hybrid nanofluid flow in a trapezoidal cross-sectioned channel under a turbulent regime ( 10 4
本研究首次对Al2O3-Cu/水混合纳米流体在湍流状态(10 4
{"title":"Energy, Entropy and Exergy Analyses of Hybrid Nanofluid Flow in a Trapezoidal Channel","authors":"Mutlu Tekir, Mutlucan Bayat, K. Arslan","doi":"10.22531/MUGLAJSCI.901966","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.901966","url":null,"abstract":"This study presents energy, entropy, and exergy analyses of Al2O3-Cu/water hybrid nanofluid flow in a trapezoidal cross-sectioned channel under a turbulent regime ( 10 4 <Re<10 5 ) for the first time. Understanding the main source of the entropy generation along the channel, also obtaining the total entropy variation of hybrid nanofluid comparing to single nanofluids (Al2O3/water and Cu/water) and base fluid is pursued objective. In other to perform these aforementioned analyses, a realistic model, in which all formulas are derived, is developed and thermodynamic concepts such as exergy efficiency and exergy destruction for hybrid nanofluid flow in a non-circular cross-sectioned channel are discussed for the first time. Results obtaining from the analyses of both hybrid and single nanofluids have been compared and discussed for volumetric concentrations of 1.0% and 2.0%. As a result, it is obtained that 2.0% volume concentration hybrid nanofluid offers the best convective heat transfer performance with 34% enhancement and best exergetic performance. Furthermore, hybrid nanofluid has the lowest entropy generation value.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130261423","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 : 2021-04-19DOI: 10.22531/MUGLAJSCI.855685
Tuğba Ören Varol
The fabrication of acid functionalized multi-walled carbon nanotube (fMWCNT) combined apple tissue based amperometric biosensor through a cross-linking agent-free approach has been presented for the phenol detection in this study. Apple tissue entrapped in fMWCNT-glassy carbon paste composite was employed as the natural polyphenol oxidase source for the enzymatic oxidation of phenol and the consumption of the dissolved oxygen was monitored via chronoamperometry as the biosensor response. The effect of experimental parameters (e.g. working potential, pH and tissue amount) were examined to obtain the optimum measurement conditions. Under optimized conditions, amperometric responses linearly increased in the range of 10-200 µM phenol and limit of detection was calculated as 3.26 µM (n=3). Apple tissue based biosensor was utilized for the phenol detection in tap water samples by serving satisfying recovery values.
{"title":"Development of Apple Tissue and Acid Treated Multi-Walled Carbon Nanotube Based Amperometric Biosensor for Phenol Detection","authors":"Tuğba Ören Varol","doi":"10.22531/MUGLAJSCI.855685","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.855685","url":null,"abstract":"The fabrication of acid functionalized multi-walled carbon nanotube (fMWCNT) combined apple tissue based amperometric biosensor through a cross-linking agent-free approach has been presented for the phenol detection in this study. Apple tissue entrapped in fMWCNT-glassy carbon paste composite was employed as the natural polyphenol oxidase source for the enzymatic oxidation of phenol and the consumption of the dissolved oxygen was monitored via chronoamperometry as the biosensor response. The effect of experimental parameters (e.g. working potential, pH and tissue amount) were examined to obtain the optimum measurement conditions. Under optimized conditions, amperometric responses linearly increased in the range of 10-200 µM phenol and limit of detection was calculated as 3.26 µM (n=3). Apple tissue based biosensor was utilized for the phenol detection in tap water samples by serving satisfying recovery values.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129153654","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 : 2021-03-08DOI: 10.22531/MUGLAJSCI.870989
E. Isen
In this study, 2.5 kW single-phase pulse-width modulated rectifier is simulated with three different control techniques to investigate the performance of controllers. Rectifier simulation is performed in Matlab / Simulink environment by using hysteresis current control, sinusoidal pulse width modulation and voltage oriented control techniques. In the performance comparison of the control techniques, considering the switching frequencies, the total harmonic content of the current drawn from the grid, the phase difference between the grid voltage and the grid current, and the DC bus voltage regulation at the output are considered as comparison criteria. The switching frequency is set to 35 kHz in sinusoidal pulse width modulation and voltage oriented control techniques. Since the switching frequency is variable in the hysteresis current control technique, the average and instantaneous switching frequency are calculated for different hysteresis band values. In the results with the technique, the switching frequency varies between 18.52 kHz and 47.6 kHz, while the average switching frequency is 34.6 kHz. As a result, the total harmonic distortion of the grid current with hysteresis current control, sinusoidal pulse width modulation and voltage oriented control techniques is 3.69%, 1.12% and 1.82%, respectively. The synchronization with the grid voltage is achieved with all techniques, and the DC voltage is regulated with active power.
{"title":"COMPARATIVE STUDY OF SINGLE-PHASE PWM RECTIFIER CONTROL TECHNIQUES","authors":"E. Isen","doi":"10.22531/MUGLAJSCI.870989","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.870989","url":null,"abstract":"In this study, 2.5 kW single-phase pulse-width modulated rectifier is simulated with three different control techniques to investigate the performance of controllers. Rectifier simulation is performed in Matlab / Simulink environment by using hysteresis current control, sinusoidal pulse width modulation and voltage oriented control techniques. In the performance comparison of the control techniques, considering the switching frequencies, the total harmonic content of the current drawn from the grid, the phase difference between the grid voltage and the grid current, and the DC bus voltage regulation at the output are considered as comparison criteria. The switching frequency is set to 35 kHz in sinusoidal pulse width modulation and voltage oriented control techniques. Since the switching frequency is variable in the hysteresis current control technique, the average and instantaneous switching frequency are calculated for different hysteresis band values. In the results with the technique, the switching frequency varies between 18.52 kHz and 47.6 kHz, while the average switching frequency is 34.6 kHz. As a result, the total harmonic distortion of the grid current with hysteresis current control, sinusoidal pulse width modulation and voltage oriented control techniques is 3.69%, 1.12% and 1.82%, respectively. The synchronization with the grid voltage is achieved with all techniques, and the DC voltage is regulated with active power.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121412698","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 : 2021-02-27DOI: 10.22531/MUGLAJSCI.824451
A. Kalay, K. Ulgen, Ali Ağçal
Inductive loads demand reactive power that does not turn into useful energy from the energy source, adversely affects system components, and releases excessive thermal energy. The control of the power factor (cos φ) decreases the negative effect of reactive power in the system by performing reactive power compensation (RPC). In this study, RPC is applied to a Photovoltaic (PV) system to increase the overall system. The designed system's main components' mathematical modeling and performance simulations are made using MATLAB codes and Simulink modellings. Simulation-based performance data were compared with the data obtained from the experimental setup. As a result of the study, the system's current-carrying capacity (CCC) is increased, a reduction in thermal energy is obtained; therefore, the system performance is optimized.
{"title":"REACTIVE POWER COMPENSATION BASED OPTIMIZATION OF MICRO-SCALE STAND-ALONE PHOTOVOLTAIC SYSTEMS","authors":"A. Kalay, K. Ulgen, Ali Ağçal","doi":"10.22531/MUGLAJSCI.824451","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.824451","url":null,"abstract":"Inductive loads demand reactive power that does not turn into useful energy from the energy source, adversely affects system components, and releases excessive thermal energy. The control of the power factor (cos φ) decreases the negative effect of reactive power in the system by performing reactive power compensation (RPC). In this study, RPC is applied to a Photovoltaic (PV) system to increase the overall system. The designed system's main components' mathematical modeling and performance simulations are made using MATLAB codes and Simulink modellings. Simulation-based performance data were compared with the data obtained from the experimental setup. As a result of the study, the system's current-carrying capacity (CCC) is increased, a reduction in thermal energy is obtained; therefore, the system performance is optimized.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131277100","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 : 2021-02-23DOI: 10.22531/MUGLAJSCI.794422
F. Hacivelioğlu
The purpose of the paper is to investigate the backscattering at a triangular cylinder with one soft (electric) face and two hard (magnetic) faces and to reveal the scattering properties of the geometry. In the paper, the backscattered field in the far-zone is introduced using the Physical Theory of Diffraction (PTD), one of the powerful high-frequency approximation techniques. First-order PTD approximation is obtained as a sum of the primary edge waves. Graphical results that have minimums in the radar cross-section represent the importance of geometry in applications of stealth technology. The method used in the paper allows the radar cross section (RCS) to calculate easily using simple trigonometric functions.
{"title":"AN APPLICATION OF PRIMARY PTD APPROXIMATION: BACKSCATTERING AT TRIANGULAR CYLINDER","authors":"F. Hacivelioğlu","doi":"10.22531/MUGLAJSCI.794422","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.794422","url":null,"abstract":"The purpose of the paper is to investigate the backscattering at a triangular cylinder with one soft (electric) face and two hard (magnetic) faces and to reveal the scattering properties of the geometry. In the paper, the backscattered field in the far-zone is introduced using the Physical Theory of Diffraction (PTD), one of the powerful high-frequency approximation techniques. First-order PTD approximation is obtained as a sum of the primary edge waves. Graphical results that have minimums in the radar cross-section represent the importance of geometry in applications of stealth technology. The method used in the paper allows the radar cross section (RCS) to calculate easily using simple trigonometric functions.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129892113","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 : 2021-02-04DOI: 10.22531/MUGLAJSCI.820783
Bircan Dinç, Muhammad Ilyas, H. Kaygusuz, O. Ucan
The use of 5 GHz Wi-Fi has spread and potential effects on microorganisms and human health are still under investigation. To investigate the possible effects for that, experiments were performed using three different microorganisms, Escherichia coli, SH-SY5Y human neuroblastoma cells and Caernohabditis elegans. The maximum allowed temperature for the Wi-Fi Access Point (AP) was considered in the measurement setup in order not to harm the internal circuitry of the router which can result impact the performance of the router. Suspension turbidity, optical density measurements and simultaneous counting of E. coli were performed. It was observed that 5 GHz Wi-Fi exposure slow down the E. coli growth rate at the same temperature conditions with sham exposed groups especially after the first 6 h. 5 GHz Wi-Fi induced decrease in cell viability remarkably for the cells seeded at densities 20,40, 100 (×10 3 ) and viability values were varied between 20 and 30%. C. elegans which is a nematode, plays key role in nutrient cycling and soil fertilization was affected by the radiation and egg-laying rates changed by 27.49%.
{"title":"5 GHz Wi-Fi effects on Escherichia coli, Caenorhabditis Elegans and human neuroblastoma cells","authors":"Bircan Dinç, Muhammad Ilyas, H. Kaygusuz, O. Ucan","doi":"10.22531/MUGLAJSCI.820783","DOIUrl":"https://doi.org/10.22531/MUGLAJSCI.820783","url":null,"abstract":"The use of 5 GHz Wi-Fi has spread and potential effects on microorganisms and human health are still under investigation. To investigate the possible effects for that, experiments were performed using three different microorganisms, Escherichia coli, SH-SY5Y human neuroblastoma cells and Caernohabditis elegans. The maximum allowed temperature for the Wi-Fi Access Point (AP) was considered in the measurement setup in order not to harm the internal circuitry of the router which can result impact the performance of the router. Suspension turbidity, optical density measurements and simultaneous counting of E. coli were performed. It was observed that 5 GHz Wi-Fi exposure slow down the E. coli growth rate at the same temperature conditions with sham exposed groups especially after the first 6 h. 5 GHz Wi-Fi induced decrease in cell viability remarkably for the cells seeded at densities 20,40, 100 (×10 3 ) and viability values were varied between 20 and 30%. C. elegans which is a nematode, plays key role in nutrient cycling and soil fertilization was affected by the radiation and egg-laying rates changed by 27.49%.","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116878841","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 : 2021-01-29DOI: 10.22531/muglajsci.840663
D. Akbay, Nazmi Şengün, G. Ekincioğlu, R. Altindag
{"title":"INVESTIGATION OF SAMPLE SIZE EFFECT ON FLEXURAL STRENGTH OF CARBONATE ROCKS ACCORDING TO TS EN 12372","authors":"D. Akbay, Nazmi Şengün, G. Ekincioğlu, R. Altindag","doi":"10.22531/muglajsci.840663","DOIUrl":"https://doi.org/10.22531/muglajsci.840663","url":null,"abstract":"","PeriodicalId":149663,"journal":{"name":"Mugla Journal of Science and Technology","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126332547","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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