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  • Improving an Expert-Supported Dynamic Programming Algorithm and Adaptive-Neuro Fuzzy Inference System for Long-Term Load Forecasting

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017Publisher:International Journal of Intelligent Systems and Applications in Engineering
    Authors: Nurettin Cetinkaya;

    doi: 10.18201/ijisae.2017533858

    Load forecasting is very important to manage the electrical power systems. Load forecasting can be analyzed in three different ways as short-term, medium-term and long-term. Long-term load forecasting (LTLF) is in need to plan and carry on future energy demand and investment such as size of energy plant. LTLF is affected by energy consumption, national incoming per year, rates of civilization, increasing population rates and moreover economical parameters. Some of the forecasting models use mathematical formulas and statistical models such as correlation and regression analysis. In this study, a new effective expert-supported dynamic programming algorithm (ESDP) has been improved. Additionally, adaptive neuro-fuzzy inference system (ANFIS) and mathematical modeling (MM) are used to forecast long term energy demand. ANFIS is one of the famous artificial intelligence and has widely used to solve forecasting problems in literature. In addition to numerical inputs, ANFIS has linguistics inputs. The results obtained from ESDP, ANFIS and MM are compared to show availability. In order to show error levels mean absolute percentage error (MAPE) and (MAE) are used. The obtained results show that the proposed algorithms are available.

    downloadFull-Text
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017
    Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
    Data sources: International Journal of Intelligent Systems and Applications in Engineering
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017 . Peer-reviewed
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    International Journal of Intelligent Systems and Applications in Engineering
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    International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017
      Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
      Data sources: International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017 . Peer-reviewed
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      International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
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  • Improving an Expert-Supported Dynamic Programming Algorithm and Adaptive-Neuro Fuzzy Inference System for Long-Term Load Forecasting

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017Publisher:International Journal of Intelligent Systems and Applications in Engineering
    Authors: Nurettin Cetinkaya;

    doi: 10.18201/ijisae.2017533858

    Load forecasting is very important to manage the electrical power systems. Load forecasting can be analyzed in three different ways as short-term, medium-term and long-term. Long-term load forecasting (LTLF) is in need to plan and carry on future energy demand and investment such as size of energy plant. LTLF is affected by energy consumption, national incoming per year, rates of civilization, increasing population rates and moreover economical parameters. Some of the forecasting models use mathematical formulas and statistical models such as correlation and regression analysis. In this study, a new effective expert-supported dynamic programming algorithm (ESDP) has been improved. Additionally, adaptive neuro-fuzzy inference system (ANFIS) and mathematical modeling (MM) are used to forecast long term energy demand. ANFIS is one of the famous artificial intelligence and has widely used to solve forecasting problems in literature. In addition to numerical inputs, ANFIS has linguistics inputs. The results obtained from ESDP, ANFIS and MM are compared to show availability. In order to show error levels mean absolute percentage error (MAPE) and (MAE) are used. The obtained results show that the proposed algorithms are available.

    downloadFull-Text
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017
    Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
    Data sources: International Journal of Intelligent Systems and Applications in Engineering
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017 . Peer-reviewed
    Data sources: Crossref
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    International Journal of Intelligent Systems and Applications in Engineering
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    International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017
      Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
      Data sources: International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017 . Peer-reviewed
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      International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
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  • KOORDİNELİ PİYASA EKONOMİLERİNDE TARIM, ORMAN ALANLARI VE ENERJİ TÜKETİMİNİN ÇEVRESEL KALİTE ÜZERİNDEKİ ETKİSİ: AMPİRİK BİR ANALİZ

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:Mehmet Akif Ersoy Universitesi Iktisadi ve Idari Bilimler Fakultesi Dergisi
    Authors: Hüseyin Safa Ünal; Oğuz Yusuf ATASEL;

    doi: 10.30798/makuiibf.863178 , 10.60692/q5czb-bgp93 , 10.60692/xrq33-83p88

    Bu çalışma, 1990-2016 döneminde koordineli piyasa ekonomileri için tarımsal katma değerin, orman alanlarının, ekonomik büyümenin ve yenilenebilir ve yenilenemez enerji tüketiminin çevresel kalite üzerindeki etkisini panel Common Corelated Effects (CCE) modelini kullanarak incelemeyi amaçlamaktadır. Panel CCE modelinden elde edilen uzun dönem katsayılara göre orman alanlarının çevre kalitesini arttırdığı, başka bir ifadeyle karbondioksit emisyonunu azalttığı, yenilenemez enerji tüketiminin ve ekonomik büyümenin ise çevre kalitesi üzerinde negatif bir etki oluşturduğu tespit edilmiştir. Ayrıca, incelenen dönemde tarımsal katma değerin ve yenilenebilir enerji tüketiminin çevre kalitesi üzerinde bir etki oluşturmadığı görülmüştür. Son olarak değişkenler arasındaki nedensellik ilişkisi Dumitrescu–Hurlin testi ile araştırılmıştır. Uygulanan nedensellik testi ile tarım ile karbondioksit emisyonları, tarım ile yenilenemez enerji tüketimi, yenilenebilir enerji tüketimi ile yenilenemez enerji tüketimi arasında çift yönlü nedensellik ilişkisi elde edilmiştir.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Mehmet Akif Ersoy Ün...arrow_drop_down
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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022 . Peer-reviewed
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
      Article . 2022 . Peer-reviewed
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
      Article . 2022
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      https://dx.doi.org/10.60692/q5...
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  • KOORDİNELİ PİYASA EKONOMİLERİNDE TARIM, ORMAN ALANLARI VE ENERJİ TÜKETİMİNİN ÇEVRESEL KALİTE ÜZERİNDEKİ ETKİSİ: AMPİRİK BİR ANALİZ

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:Mehmet Akif Ersoy Universitesi Iktisadi ve Idari Bilimler Fakultesi Dergisi
    Authors: Hüseyin Safa Ünal; Oğuz Yusuf ATASEL;

    doi: 10.30798/makuiibf.863178 , 10.60692/q5czb-bgp93 , 10.60692/xrq33-83p88

    Bu çalışma, 1990-2016 döneminde koordineli piyasa ekonomileri için tarımsal katma değerin, orman alanlarının, ekonomik büyümenin ve yenilenebilir ve yenilenemez enerji tüketiminin çevresel kalite üzerindeki etkisini panel Common Corelated Effects (CCE) modelini kullanarak incelemeyi amaçlamaktadır. Panel CCE modelinden elde edilen uzun dönem katsayılara göre orman alanlarının çevre kalitesini arttırdığı, başka bir ifadeyle karbondioksit emisyonunu azalttığı, yenilenemez enerji tüketiminin ve ekonomik büyümenin ise çevre kalitesi üzerinde negatif bir etki oluşturduğu tespit edilmiştir. Ayrıca, incelenen dönemde tarımsal katma değerin ve yenilenebilir enerji tüketiminin çevre kalitesi üzerinde bir etki oluşturmadığı görülmüştür. Son olarak değişkenler arasındaki nedensellik ilişkisi Dumitrescu–Hurlin testi ile araştırılmıştır. Uygulanan nedensellik testi ile tarım ile karbondioksit emisyonları, tarım ile yenilenemez enerji tüketimi, yenilenebilir enerji tüketimi ile yenilenemez enerji tüketimi arasında çift yönlü nedensellik ilişkisi elde edilmiştir.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Mehmet Akif Ersoy Ün...arrow_drop_down
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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022 . Peer-reviewed
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022
    Data sources: DOAJ
    https://dx.doi.org/10.60692/q5...
    Other literature type . 2022
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    Other literature type . 2022
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    TÜBİTAK ULAKBİM DergiPark
    Article . 2021
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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      TÜBİTAK ULAKBİM DergiPark
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  • The Nexus among Civil Aviation, Energy Performance Efficiency and GDP in terms of Ecological Footprint: Evidence from France and Finland

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:EconJournals
    Authors: Erdal Dursun;

    doi: 10.32479/ijeep.13399 , 10.60692/pcxz3-br663 , 10.60692/dh081-asj15

    The major goal of this research paper is to determine the long-run linkage among variables and the impact of civil aviation, energy productivity (efficiency), economic growth (GDP), on ecological footprint through conducting the multivariate regression method, Phillips‑Ouliaris and Engle‑Granger, Jarque – Bera Normality, and Cusum tests from 1970 to 2020. According to results of multivariate regression method, civil aviation, energy efficiency, and economic growth affect the ecological footprint from 1970 to 2020 in France which is coincide with Phillips‑Ouliaris and Engle‑Granger tests. On the contrary, there is no effect of independent variables on dependent variable (ecological footprint) in Finland which is consistent with Phillips‑Ouliaris and Engle‑Granger tests. In this respect, The long-run relation of the model is verified by the cointegration test of Engle-Granger and Phillips-Ouliaris for France. However, there is no long-run co-integration among variables for Finland from 1970-2020. To sum up, empirical results of France is verified EKC hypothesis. However, EKC hypothesis is not verified for Finland.

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    International Journal of Energy Economics and Policy
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    International Journal of Energy Economics and Policy
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      International Journal of Energy Economics and Policy
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      International Journal of Energy Economics and Policy
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  • The Nexus among Civil Aviation, Energy Performance Efficiency and GDP in terms of Ecological Footprint: Evidence from France and Finland

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:EconJournals
    Authors: Erdal Dursun;

    doi: 10.32479/ijeep.13399 , 10.60692/pcxz3-br663 , 10.60692/dh081-asj15

    The major goal of this research paper is to determine the long-run linkage among variables and the impact of civil aviation, energy productivity (efficiency), economic growth (GDP), on ecological footprint through conducting the multivariate regression method, Phillips‑Ouliaris and Engle‑Granger, Jarque – Bera Normality, and Cusum tests from 1970 to 2020. According to results of multivariate regression method, civil aviation, energy efficiency, and economic growth affect the ecological footprint from 1970 to 2020 in France which is coincide with Phillips‑Ouliaris and Engle‑Granger tests. On the contrary, there is no effect of independent variables on dependent variable (ecological footprint) in Finland which is consistent with Phillips‑Ouliaris and Engle‑Granger tests. In this respect, The long-run relation of the model is verified by the cointegration test of Engle-Granger and Phillips-Ouliaris for France. However, there is no long-run co-integration among variables for Finland from 1970-2020. To sum up, empirical results of France is verified EKC hypothesis. However, EKC hypothesis is not verified for Finland.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
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    International Journal of Energy Economics and Policy
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    International Journal of Energy Economics and Policy
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      International Journal of Energy Economics and Policy
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      International Journal of Energy Economics and Policy
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  • Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy Mg50Ni50

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2024Publisher:Elsevier BV
    Authors: Chaker Briki; Maha M. Almoneef; Abdelhakim Settar; Mbarek Mohamed; +1 Authors

    doi: 10.1016/j.heliyon.2024.e31019

    pmid: 38803923

    pmc: PMC11128885

    In the present study, we explored the temperature evolution and hydrogen desorption properties of the Mg50Ni50 alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar. Simultaneously, a mathematical approach was employed to numerically investigate the temperature evolution within the hydride bed. Using COMSOL Multiphysics as a simulator, a numerical simulation was conducted based on experimental data. The study examined the impact of cooling temperature on hydride temperature evolution. Results revealed that hydrogen desorption kinetics of the amorphous Mg50Ni50 alloy are more significant compared to those of Mg2Ni compounds. Moreover, the effect of the warming temperature on the equilibrium pressure can also be observed in the hydrogen desorption isotherm curves. The experimental study of the Mg50Ni50 alloy provided activation energy data, along with determination of hydride formation enthalpy and entropy. On the other hand, we showed that the hydride temperature is maximum at the hydride-hydrogen interface within the hydride center.

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    Heliyon
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    License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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      License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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  • Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy Mg50Ni50

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2024Publisher:Elsevier BV
    Authors: Chaker Briki; Maha M. Almoneef; Abdelhakim Settar; Mbarek Mohamed; +1 Authors

    doi: 10.1016/j.heliyon.2024.e31019

    pmid: 38803923

    pmc: PMC11128885

    In the present study, we explored the temperature evolution and hydrogen desorption properties of the Mg50Ni50 alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar. Simultaneously, a mathematical approach was employed to numerically investigate the temperature evolution within the hydride bed. Using COMSOL Multiphysics as a simulator, a numerical simulation was conducted based on experimental data. The study examined the impact of cooling temperature on hydride temperature evolution. Results revealed that hydrogen desorption kinetics of the amorphous Mg50Ni50 alloy are more significant compared to those of Mg2Ni compounds. Moreover, the effect of the warming temperature on the equilibrium pressure can also be observed in the hydrogen desorption isotherm curves. The experimental study of the Mg50Ni50 alloy provided activation energy data, along with determination of hydride formation enthalpy and entropy. On the other hand, we showed that the hydride temperature is maximum at the hydride-hydrogen interface within the hydride center.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Heliyonarrow_drop_down
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    Article . 2024 . Peer-reviewed
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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      License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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  • High Tap Density Li4Ti5O12 Microspheres: Synthetic Conditions and Advanced Electrochemical Performance

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017 Saudi Arabia Publisher:Wiley
    Authors: Junwei Zheng; Qun Zhou; Jianxin Ren; Zhenyong Jia; +4 Authors

    doi: 10.1002/ente.201700069

    handle: 10754/623089

    AbstractPreparation of uniform, spherical Li4Ti5O12 with high tap density is significant to achieve a high volumetric energy density in lithium‐ion batteries. Herein, Li4Ti5O12 microspheres with variable tap density and tunable size distribution were synthesized by a newly designed industrial spray‐drying approach. The slurry concentration, sintering time, sintering conditions after spraying, and the effect of lithium/titanium molar ratio on the lithium‐ion (Li+) storage capability were investigated. A narrow particle size distribution of around 10 μm and a high tap density close to 1.4 g cm−3 of the Li4Ti5O12 spheres can be obtained under the optimized conditions. The Li4Ti5O12 spheres can deliver a much higher capacity of 168 mAh g−1 at a rate of 1 C and show a high capacity retention of 97.7 % over 400 cycles. The synthetic conditions are confirmed to be critical for improving the electron conductivity and Li+ diffusivity by adjusting the crystal and spatial structures. As‐prepared high‐performance Li4Ti5O12 is an ideal electrode for lithium‐ion batteries or capacitors; meanwhile, the presented approach is also applicable for preparing other kind of spherical materials.

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  • High Tap Density Li4Ti5O12 Microspheres: Synthetic Conditions and Advanced Electrochemical Performance

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017 Saudi Arabia Publisher:Wiley
    Authors: Junwei Zheng; Qun Zhou; Jianxin Ren; Zhenyong Jia; +4 Authors

    doi: 10.1002/ente.201700069

    handle: 10754/623089

    AbstractPreparation of uniform, spherical Li4Ti5O12 with high tap density is significant to achieve a high volumetric energy density in lithium‐ion batteries. Herein, Li4Ti5O12 microspheres with variable tap density and tunable size distribution were synthesized by a newly designed industrial spray‐drying approach. The slurry concentration, sintering time, sintering conditions after spraying, and the effect of lithium/titanium molar ratio on the lithium‐ion (Li+) storage capability were investigated. A narrow particle size distribution of around 10 μm and a high tap density close to 1.4 g cm−3 of the Li4Ti5O12 spheres can be obtained under the optimized conditions. The Li4Ti5O12 spheres can deliver a much higher capacity of 168 mAh g−1 at a rate of 1 C and show a high capacity retention of 97.7 % over 400 cycles. The synthetic conditions are confirmed to be critical for improving the electron conductivity and Li+ diffusivity by adjusting the crystal and spatial structures. As‐prepared high‐performance Li4Ti5O12 is an ideal electrode for lithium‐ion batteries or capacitors; meanwhile, the presented approach is also applicable for preparing other kind of spherical materials.

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  • Isı pompalı fotovoltaik/termal bütünleşik sistemin termodinamik analizi ve deneysel incelenmesi

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    descriptionPublicationkeyboard_double_arrow_right Doctoral thesis 2020 Turkey Publisher:Fen Bilimleri Enstitüsü
    Authors: Kırtepe, Erhan;

    handle: 11454/58323

    In this thesis, the design, installation and experimental analysis of the Heat Pump-Photovoltaic/Thermal (HP-PV/T) integrated system were carried out. This system can perform many functions such as electricity generation, space heating, space cooling and hot water storage for use. In addition, this system can be used all year round in different seasons and modes (heating mode and cooling mode). The main components used in the system are heat pump, PV/T collectors, balancing tanks, hot water tank, chiller, pumps and measuring instruments.In the first section of this thesis, an introduction has been made about the subject examined and in the second section, the studies on the subject in the literature have been mentioned. In the third section, detailed information about the calculation steps of the developed mathematical model of PV/T collectors used in the system is given. In the fourth section, information is given about the experimental setup and each component used in the experimental setup. In the fifth section, energy analysis has been carried out in detail for each component calculated in the experimental setup. In the sixth section, uncertainty analysis is performed on the results obtained from experimental analysis. In the seventh section, the results and evaluations obtained from the experimental study are mentioned. The results of the experimental study conducted in this section were analyzed in detail and the utilization rate of the system was found hourly for each experiment. In addition, in this section, the results obtained from the mathematical model developed for PV/T collectors and the results obtained from the experimental study were compared using Mean Bias Error (MBE), Root Mean Square Error (RMSE), Correlation Coefficient (CC) and Mean Percentage Error (MPE) statistical methods. In the last section, which is the eighth, a general evaluation of the results has been made and suggestions have been made for similar studies to be carried out in the future.In the uncertainty analysis performed for the results obtained from the experimental analysis, it was found that the values found experimentally had an uncertainty value of 2.83% to 7.72%. Since the temperature of the panel surface is kept low with the use of PV/T collectors, It has been determined that the efficiency losses that occur as the temperature rises in the PV panels are prevented to produce more electrical energy at rates ranging from 3.23% to 17.18% per hour. As a result of the hourly analysis, it has been determined that the coefficient of performance obtained by using the heat pump integrated with PV/T collectors is more than 2.83% to 22.02% compared to the heating coefficient of performance of the heat pump. Experimental analysis of the HP-PV/T integrated system on different days and in different modes was carried out and it was observed that the utilization rate of the system ranged from 1.151 to 2.581 as a result of hourly evaluations. Bu tez çalışması kapsamında, Isı Pompalı-Fotovoltaik/Termal (IP-PV/T) bütünleşik sistemin tasarımı, kurulumu ve deneysel analizi gerçekleştirilmiştir. Bu sistem elektrik üretimi, hacim ısıtma, hacim soğutma ve kullanım amaçlı sıcak su depolama gibi birçok işlevi yapabilmektedir. Ayrıca bu sistem tüm yıl boyunca farklı mevsimlerde ve modlarda (ısıtma modu ve soğutma modu) çalıştırılarak kullanılabilmektedir. Sistemde kullanılan en temel bileşenler ısı pompası, PV/T kolektörler, dengeleme tankları, sıcak su deposu, su soğutma grubu, pompalar ve ölçüm aletleridir. Bu tez çalışmasının ilk bölümünde incelenen konu hakkında bir giriş yapılmış ve ikinci bölümde bu konu ile ilgili literatürde yapılan çalışmalara değinilmiştir. Üçüncü bölümde sistemde kullanılan PV/T kolektörlere ait geliştirilen matematiksel modelin hesaplama adımları ile ilgili ayrıntılı bilgiler verilmiştir. Dördüncü bölümde kurulan deney düzeneği ve deney düzeneğinde kullanılan her bir bileşen hakkında bilgi verilmiştir. Beşinci bölümde deney düzeneğinde hesaplama yapılan her bir bileşen için ayrıntılı olarak enerji analizi gerçekleştirilmiştir. Altıncı bölümde deneysel analizlerden elde edilen sonuçlara dair hata analizi yapılmıştır. Yedinci bölümde yapılan deneysel çalışmadan elde edilen bulgulara ve değerlendirmelere değinilmiştir. Bu bölümde yapılan deneysel çalışma sonuçları ayrıntılı bir şekilde analiz edilmiş ve sistemin faydalanma oranı her bir deney için saatlik olarak bulunmuştur. Bunlara ek olarak bu bölümde PV/T kolektörlerle ilgili geliştirilen matematiksel modelden elde edilen sonuçlar ile deneysel çalışmadan elde edilen sonuçlar ortalama sistematik hata (OSH), hataların ortalama karekökü (HOK), korelasyon katsayısı (KK) ve ortalama yüzde hata (OYH) istatistiksel yöntemleri kullanılarak karşılaştırılmıştır. Sekizinci olan son bölümde ise sonuçların genel bir değerlendirmesi yapılmış ve sonraki yapılacak benzer çalışmalar için öneriler getirilmiştir. Deneysel analizlerden elde edilen sonuçlar için yapılan hata analizinde deneysel olarak bulunan değerlerin %2,83 ila %7,72 belirsizlik değerine sahip oldukları görülmüştür. PV/T kolektörlerin kullanılması ile panel yüzeyinin sıcaklığı düşük tutulduğu için, PV panellerdeki sıcaklık yükseldikçe ortaya çıkan verim kayıplarının önüne geçilerek saatlik olarak %3,23 ila %17,18 arasında değişen oranlarda daha fazla elektrik enerjisi ürettiği tespit edilmiştir. Saatlik olarak yapılan analizler sonucunda ısı pompasının PV/T kolektörler ile entegre bir şekilde kullanılması ile elde edilen etkinlik katsayısının, ısı pompasının ısıtma etkinlik katsayısına göre %2,83 ila %22,02 arasında değişen oranlarda daha fazla olduğu belirlenmiştir. IP-PV/T bütünleşik sistemin farklı günlerde ve farklı modlarda deneysel analizleri gerçekleştirilmiş ve yapılan saatlik değerlendirmeler neticesinde sistemden elde edilen faydalanma oranının 1,151 ila 2,581 arasında değiştiği görülmüştür. 161

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  • Isı pompalı fotovoltaik/termal bütünleşik sistemin termodinamik analizi ve deneysel incelenmesi

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    descriptionPublicationkeyboard_double_arrow_right Doctoral thesis 2020 Turkey Publisher:Fen Bilimleri Enstitüsü
    Authors: Kırtepe, Erhan;

    handle: 11454/58323

    In this thesis, the design, installation and experimental analysis of the Heat Pump-Photovoltaic/Thermal (HP-PV/T) integrated system were carried out. This system can perform many functions such as electricity generation, space heating, space cooling and hot water storage for use. In addition, this system can be used all year round in different seasons and modes (heating mode and cooling mode). The main components used in the system are heat pump, PV/T collectors, balancing tanks, hot water tank, chiller, pumps and measuring instruments.In the first section of this thesis, an introduction has been made about the subject examined and in the second section, the studies on the subject in the literature have been mentioned. In the third section, detailed information about the calculation steps of the developed mathematical model of PV/T collectors used in the system is given. In the fourth section, information is given about the experimental setup and each component used in the experimental setup. In the fifth section, energy analysis has been carried out in detail for each component calculated in the experimental setup. In the sixth section, uncertainty analysis is performed on the results obtained from experimental analysis. In the seventh section, the results and evaluations obtained from the experimental study are mentioned. The results of the experimental study conducted in this section were analyzed in detail and the utilization rate of the system was found hourly for each experiment. In addition, in this section, the results obtained from the mathematical model developed for PV/T collectors and the results obtained from the experimental study were compared using Mean Bias Error (MBE), Root Mean Square Error (RMSE), Correlation Coefficient (CC) and Mean Percentage Error (MPE) statistical methods. In the last section, which is the eighth, a general evaluation of the results has been made and suggestions have been made for similar studies to be carried out in the future.In the uncertainty analysis performed for the results obtained from the experimental analysis, it was found that the values found experimentally had an uncertainty value of 2.83% to 7.72%. Since the temperature of the panel surface is kept low with the use of PV/T collectors, It has been determined that the efficiency losses that occur as the temperature rises in the PV panels are prevented to produce more electrical energy at rates ranging from 3.23% to 17.18% per hour. As a result of the hourly analysis, it has been determined that the coefficient of performance obtained by using the heat pump integrated with PV/T collectors is more than 2.83% to 22.02% compared to the heating coefficient of performance of the heat pump. Experimental analysis of the HP-PV/T integrated system on different days and in different modes was carried out and it was observed that the utilization rate of the system ranged from 1.151 to 2.581 as a result of hourly evaluations. Bu tez çalışması kapsamında, Isı Pompalı-Fotovoltaik/Termal (IP-PV/T) bütünleşik sistemin tasarımı, kurulumu ve deneysel analizi gerçekleştirilmiştir. Bu sistem elektrik üretimi, hacim ısıtma, hacim soğutma ve kullanım amaçlı sıcak su depolama gibi birçok işlevi yapabilmektedir. Ayrıca bu sistem tüm yıl boyunca farklı mevsimlerde ve modlarda (ısıtma modu ve soğutma modu) çalıştırılarak kullanılabilmektedir. Sistemde kullanılan en temel bileşenler ısı pompası, PV/T kolektörler, dengeleme tankları, sıcak su deposu, su soğutma grubu, pompalar ve ölçüm aletleridir. Bu tez çalışmasının ilk bölümünde incelenen konu hakkında bir giriş yapılmış ve ikinci bölümde bu konu ile ilgili literatürde yapılan çalışmalara değinilmiştir. Üçüncü bölümde sistemde kullanılan PV/T kolektörlere ait geliştirilen matematiksel modelin hesaplama adımları ile ilgili ayrıntılı bilgiler verilmiştir. Dördüncü bölümde kurulan deney düzeneği ve deney düzeneğinde kullanılan her bir bileşen hakkında bilgi verilmiştir. Beşinci bölümde deney düzeneğinde hesaplama yapılan her bir bileşen için ayrıntılı olarak enerji analizi gerçekleştirilmiştir. Altıncı bölümde deneysel analizlerden elde edilen sonuçlara dair hata analizi yapılmıştır. Yedinci bölümde yapılan deneysel çalışmadan elde edilen bulgulara ve değerlendirmelere değinilmiştir. Bu bölümde yapılan deneysel çalışma sonuçları ayrıntılı bir şekilde analiz edilmiş ve sistemin faydalanma oranı her bir deney için saatlik olarak bulunmuştur. Bunlara ek olarak bu bölümde PV/T kolektörlerle ilgili geliştirilen matematiksel modelden elde edilen sonuçlar ile deneysel çalışmadan elde edilen sonuçlar ortalama sistematik hata (OSH), hataların ortalama karekökü (HOK), korelasyon katsayısı (KK) ve ortalama yüzde hata (OYH) istatistiksel yöntemleri kullanılarak karşılaştırılmıştır. Sekizinci olan son bölümde ise sonuçların genel bir değerlendirmesi yapılmış ve sonraki yapılacak benzer çalışmalar için öneriler getirilmiştir. Deneysel analizlerden elde edilen sonuçlar için yapılan hata analizinde deneysel olarak bulunan değerlerin %2,83 ila %7,72 belirsizlik değerine sahip oldukları görülmüştür. PV/T kolektörlerin kullanılması ile panel yüzeyinin sıcaklığı düşük tutulduğu için, PV panellerdeki sıcaklık yükseldikçe ortaya çıkan verim kayıplarının önüne geçilerek saatlik olarak %3,23 ila %17,18 arasında değişen oranlarda daha fazla elektrik enerjisi ürettiği tespit edilmiştir. Saatlik olarak yapılan analizler sonucunda ısı pompasının PV/T kolektörler ile entegre bir şekilde kullanılması ile elde edilen etkinlik katsayısının, ısı pompasının ısıtma etkinlik katsayısına göre %2,83 ila %22,02 arasında değişen oranlarda daha fazla olduğu belirlenmiştir. IP-PV/T bütünleşik sistemin farklı günlerde ve farklı modlarda deneysel analizleri gerçekleştirilmiş ve yapılan saatlik değerlendirmeler neticesinde sistemden elde edilen faydalanma oranının 1,151 ila 2,581 arasında değiştiği görülmüştür. 161

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  • Optimal orientation angles for maximizing energy yield for solar PV in Saudi Arabia

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2019 Canada Publisher:Elsevier BV
    Authors: Hassan Z. Al Garni; Hassan Z. Al Garni; David Wright; Anjali Awasthi;

    doi: 10.1016/j.renene.2018.10.048

    Abstract This paper uses research-quality, ground measurements of irradiance and temperature that are accurate to ±2% to estimate the electric energy yield of fixed solar modules for utility-scale solar power plants at 18 sites in Saudi Arabia. The calculation is performed for a range of tilt and azimuth angles and the orientation that gives the optimum annual energy yield is determined. A detailed analysis is presented for Riyadh including the impact of non-optimal tilt and azimuth angles on annual energy yield. It is also found that energy yield in March and October are higher than in April and September, due to milder operating temperatures of the modules. A similar optimization of tilt and azimuth is performed each month separately. Adjusting the orientation each month increases energy yield by 4.01% compared to the annual optimum, but requires considerable labour cost. Further analysis shows that an increase in energy yield of 3.63% can be obtained by adjusting the orientation at five selected times during the year, thus significantly reducing the labour requirement. The optimal orientation and corresponding energy yield for all 18 sites is combined with a site suitability analysis taking into account climate, topography and proximity to roads, transmission lines and protected areas. Six sites are selected as having high suitability and high energy yield: Albaha, Arar, Hail, Riyadh, Tabuk and Taif. For these cities the optimal tilt is only slightly higher than the latitude, however the optimum azimuth is from 20° to 53° west of south due to an asymmetrical daily irradiance profile.

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  • Optimal orientation angles for maximizing energy yield for solar PV in Saudi Arabia

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2019 Canada Publisher:Elsevier BV
    Authors: Hassan Z. Al Garni; Hassan Z. Al Garni; David Wright; Anjali Awasthi;

    doi: 10.1016/j.renene.2018.10.048

    Abstract This paper uses research-quality, ground measurements of irradiance and temperature that are accurate to ±2% to estimate the electric energy yield of fixed solar modules for utility-scale solar power plants at 18 sites in Saudi Arabia. The calculation is performed for a range of tilt and azimuth angles and the orientation that gives the optimum annual energy yield is determined. A detailed analysis is presented for Riyadh including the impact of non-optimal tilt and azimuth angles on annual energy yield. It is also found that energy yield in March and October are higher than in April and September, due to milder operating temperatures of the modules. A similar optimization of tilt and azimuth is performed each month separately. Adjusting the orientation each month increases energy yield by 4.01% compared to the annual optimum, but requires considerable labour cost. Further analysis shows that an increase in energy yield of 3.63% can be obtained by adjusting the orientation at five selected times during the year, thus significantly reducing the labour requirement. The optimal orientation and corresponding energy yield for all 18 sites is combined with a site suitability analysis taking into account climate, topography and proximity to roads, transmission lines and protected areas. Six sites are selected as having high suitability and high energy yield: Albaha, Arar, Hail, Riyadh, Tabuk and Taif. For these cities the optimal tilt is only slightly higher than the latitude, however the optimum azimuth is from 20° to 53° west of south due to an asymmetrical daily irradiance profile.

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  • Yol ve Yol-Dışı Yüzeylerde Taşıt Dinamiği Benzetimleri – Karşılaştırmalı Bir Analiz

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2018Publisher:Sakarya University Journal of Science
    Authors: Erdem Uzunsoy;

    doi: 10.16984/saufenbilder.333872

    Tasit dinamigi modellemelerinde kullanilan lastik modelleri genellikle tasitlarin ozel olarak insa edilmis ve tutunmaya yonelik ozellikleri tanimlanmis yollar uzerindeki davranislarina dayali gelistirilmis modellerdir. Yol ve yol disi surulebilen tasitlarin her iki farkli yuzey uzerindeki davranislari ise degiskendir. Bu calismada; hem yol hem de yol disi olarak uyarlanabilen bir lastik modeli temelinde standart tasit dinamigi manevralari uzerinden simulatif karsilastirmalarla gercekte olan ya da karsilasilabilen durumlara bir yaklasim gosterilmektedir. Modelleme ve simulasyon ortami olarak Matlab/Simulink kullanilmistir.

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  • Yol ve Yol-Dışı Yüzeylerde Taşıt Dinamiği Benzetimleri – Karşılaştırmalı Bir Analiz

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2018Publisher:Sakarya University Journal of Science
    Authors: Erdem Uzunsoy;

    doi: 10.16984/saufenbilder.333872

    Tasit dinamigi modellemelerinde kullanilan lastik modelleri genellikle tasitlarin ozel olarak insa edilmis ve tutunmaya yonelik ozellikleri tanimlanmis yollar uzerindeki davranislarina dayali gelistirilmis modellerdir. Yol ve yol disi surulebilen tasitlarin her iki farkli yuzey uzerindeki davranislari ise degiskendir. Bu calismada; hem yol hem de yol disi olarak uyarlanabilen bir lastik modeli temelinde standart tasit dinamigi manevralari uzerinden simulatif karsilastirmalarla gercekte olan ya da karsilasilabilen durumlara bir yaklasim gosterilmektedir. Modelleme ve simulasyon ortami olarak Matlab/Simulink kullanilmistir.

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  • COMPARSION OF BIODIESEL AND ETHANOL AS AN ALTERNATIVE DIESEL ENGINE FUEL

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article 2005 Turkey Publisher:Pamukkale University
    Authors: Usta, Nazım; Can, Özer; Öztürk, Erkan;

    handle: 11499/39606

    Biodiesel and ethanol are alternative renewable diesel engine fuels and their mixtures with diesel fuel No. 2 at different proportions can be used in diesel engines. Although ethanol is unique chemical molecule and has certain specifications, specifications of biodiesel may vary depending on type of the oil used in the production and esterification technique. In this study, the specifications of ethanol and two different biodiesels were compared with those of diesel fuel No. 2. Effects of ethanol and the biodiesels on performance and emissions of a turbocharged indirect injection diesel engine were investigated. The alternative fuels used in the experiments caused increase in NOx emission, while they reduced CO, soot and SO2 emissions. Although ethanol addition caused some power reduction, the biodiesel addition resulted in slightly higher power with respect to the diesel fuel. Biyodizel ve etanol, dizel motorlar için yenilenebilir alternatif yakıtlardır ve farklı oranlarda No. 2 dizel yakıta karıştırılarak dizel motorlarda kullanılabilirler. Etanol tek bir kimyasal yapıya ve belli özelliklere sahip yakıt olmasına rağmen, biyodizellerin özellikleri elde edildikleri yağın cinsine ve esterleştirme metodlarına bağlı olarak değişmektedir. Bu çalışmada etanol ve iki farklı biyodizelin özellikleri No. 2 dizel yakıt ile karşılaştırılmış, etanol ve biyodizellerin ön yanma odalı turbo dizel bir motorun performans ve emisyonlarına etkileri incelenmiştir. Kullanılan alternatif yakıtlar CO, is ve SO2 emisyonlarının azalmasını sağlarken, NOx emisyonunda artışa sebep olmuştur. Etanol ilavesi güçte bir miktar düşmeye sebep olurken, biyodizel ilavesi dizel yakıta göre çok az oranda güç artışı sağlamıştır.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Pamukkale University...arrow_drop_down
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    Pamukkale University Journal of Engineering Sciences
    Article . 2005
    Data sources: DOAJ
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    Pamukkale GCRIS Database
    Article . 2005
    Data sources: Pamukkale GCRIS Database
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    Pamukkale University Journal of Engineering Sciences
    Article . 2005 . Peer-reviewed
    Data sources: TÜBİTAK ULAKBİM DergiPark
    TÜBİTAK ULAKBİM DergiPark
    Article . 2015
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      Pamukkale University Journal of Engineering Sciences
      Article . 2005
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      Article . 2005
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Pamukkale University Journal of Engineering Sciences
      Article . 2005 . Peer-reviewed
      Data sources: TÜBİTAK ULAKBİM DergiPark
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      Article . 2015
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  • COMPARSION OF BIODIESEL AND ETHANOL AS AN ALTERNATIVE DIESEL ENGINE FUEL

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article 2005 Turkey Publisher:Pamukkale University
    Authors: Usta, Nazım; Can, Özer; Öztürk, Erkan;

    handle: 11499/39606

    Biodiesel and ethanol are alternative renewable diesel engine fuels and their mixtures with diesel fuel No. 2 at different proportions can be used in diesel engines. Although ethanol is unique chemical molecule and has certain specifications, specifications of biodiesel may vary depending on type of the oil used in the production and esterification technique. In this study, the specifications of ethanol and two different biodiesels were compared with those of diesel fuel No. 2. Effects of ethanol and the biodiesels on performance and emissions of a turbocharged indirect injection diesel engine were investigated. The alternative fuels used in the experiments caused increase in NOx emission, while they reduced CO, soot and SO2 emissions. Although ethanol addition caused some power reduction, the biodiesel addition resulted in slightly higher power with respect to the diesel fuel. Biyodizel ve etanol, dizel motorlar için yenilenebilir alternatif yakıtlardır ve farklı oranlarda No. 2 dizel yakıta karıştırılarak dizel motorlarda kullanılabilirler. Etanol tek bir kimyasal yapıya ve belli özelliklere sahip yakıt olmasına rağmen, biyodizellerin özellikleri elde edildikleri yağın cinsine ve esterleştirme metodlarına bağlı olarak değişmektedir. Bu çalışmada etanol ve iki farklı biyodizelin özellikleri No. 2 dizel yakıt ile karşılaştırılmış, etanol ve biyodizellerin ön yanma odalı turbo dizel bir motorun performans ve emisyonlarına etkileri incelenmiştir. Kullanılan alternatif yakıtlar CO, is ve SO2 emisyonlarının azalmasını sağlarken, NOx emisyonunda artışa sebep olmuştur. Etanol ilavesi güçte bir miktar düşmeye sebep olurken, biyodizel ilavesi dizel yakıta göre çok az oranda güç artışı sağlamıştır.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Pamukkale University...arrow_drop_down
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    Pamukkale University Journal of Engineering Sciences
    Article . 2005
    Data sources: DOAJ
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    Pamukkale GCRIS Database
    Article . 2005
    Data sources: Pamukkale GCRIS Database
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Pamukkale University Journal of Engineering Sciences
    Article . 2005 . Peer-reviewed
    Data sources: TÜBİTAK ULAKBİM DergiPark
    TÜBİTAK ULAKBİM DergiPark
    Article . 2015
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      Pamukkale University Journal of Engineering Sciences
      Article . 2005
      Data sources: DOAJ
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      Article . 2005
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      Pamukkale University Journal of Engineering Sciences
      Article . 2005 . Peer-reviewed
      Data sources: TÜBİTAK ULAKBİM DergiPark
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      Article . 2015
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  • Evaluation of the proximity effect on flow-accelerated corrosion

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2010Publisher:Elsevier BV
    Authors: Wael H. Ahmed;

    doi: 10.1016/j.anucene.2009.12.020

    Abstract Flow-accelerated corrosion (FAC) is a degradation mechanism that affects carbon steel piping in power plants. The failures and degradation due to FAC have necessitated numerous replacements in many power plants. Several computer codes around the world were developed as part of a systematic program or process to control FAC in power plant utilities. The typical plant model requires the input of the flow parameters, piping configuration and the plant water chemistry. The results on FAC rate are considered the key to proper selection of components for inspection. The lack of information on the effect of the upstream components located in the proximity limited the accuracy of the FAC prediction tools and hence will affect the accuracy in identifying potential inspection locations. In the present study 211 inspection data for 90° carbon steel elbows from several nuclear power plants were used to determine the effect of the proximity between two components on the FAC wear rate. The effect of the velocity as well as the distance between the elbows and the upstream components is discussed in the present analysis. Based on the analyzed trends obtained from the inspection data, significant increase in the wear rate of approximately 70% on average is identified to be due to the proximity.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Annals of Nuclear Energy
    Article . 2010 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Annals of Nuclear Energy
      Article . 2010 . Peer-reviewed
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  • Evaluation of the proximity effect on flow-accelerated corrosion

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2010Publisher:Elsevier BV
    Authors: Wael H. Ahmed;

    doi: 10.1016/j.anucene.2009.12.020

    Abstract Flow-accelerated corrosion (FAC) is a degradation mechanism that affects carbon steel piping in power plants. The failures and degradation due to FAC have necessitated numerous replacements in many power plants. Several computer codes around the world were developed as part of a systematic program or process to control FAC in power plant utilities. The typical plant model requires the input of the flow parameters, piping configuration and the plant water chemistry. The results on FAC rate are considered the key to proper selection of components for inspection. The lack of information on the effect of the upstream components located in the proximity limited the accuracy of the FAC prediction tools and hence will affect the accuracy in identifying potential inspection locations. In the present study 211 inspection data for 90° carbon steel elbows from several nuclear power plants were used to determine the effect of the proximity between two components on the FAC wear rate. The effect of the velocity as well as the distance between the elbows and the upstream components is discussed in the present analysis. Based on the analyzed trends obtained from the inspection data, significant increase in the wear rate of approximately 70% on average is identified to be due to the proximity.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Annals of Nuclear Energy
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Annals of Nuclear Energy
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  • Improving an Expert-Supported Dynamic Programming Algorithm and Adaptive-Neuro Fuzzy Inference System for Long-Term Load Forecasting

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017Publisher:International Journal of Intelligent Systems and Applications in Engineering
    Authors: Nurettin Cetinkaya;

    doi: 10.18201/ijisae.2017533858

    Load forecasting is very important to manage the electrical power systems. Load forecasting can be analyzed in three different ways as short-term, medium-term and long-term. Long-term load forecasting (LTLF) is in need to plan and carry on future energy demand and investment such as size of energy plant. LTLF is affected by energy consumption, national incoming per year, rates of civilization, increasing population rates and moreover economical parameters. Some of the forecasting models use mathematical formulas and statistical models such as correlation and regression analysis. In this study, a new effective expert-supported dynamic programming algorithm (ESDP) has been improved. Additionally, adaptive neuro-fuzzy inference system (ANFIS) and mathematical modeling (MM) are used to forecast long term energy demand. ANFIS is one of the famous artificial intelligence and has widely used to solve forecasting problems in literature. In addition to numerical inputs, ANFIS has linguistics inputs. The results obtained from ESDP, ANFIS and MM are compared to show availability. In order to show error levels mean absolute percentage error (MAPE) and (MAE) are used. The obtained results show that the proposed algorithms are available.

    downloadFull-Text
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017
    Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
    Data sources: International Journal of Intelligent Systems and Applications in Engineering
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017 . Peer-reviewed
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    International Journal of Intelligent Systems and Applications in Engineering
    Article
    License: CC BY SA
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    International Journal of Intelligent Systems and Applications in Engineering
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ International Journa...arrow_drop_down
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017
      Full-Text: https://www.ijisae.org/index.php/IJISAE/article/download/511/pdf
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017 . Peer-reviewed
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      International Journal of Intelligent Systems and Applications in Engineering
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  • Improving an Expert-Supported Dynamic Programming Algorithm and Adaptive-Neuro Fuzzy Inference System for Long-Term Load Forecasting

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017Publisher:International Journal of Intelligent Systems and Applications in Engineering
    Authors: Nurettin Cetinkaya;

    doi: 10.18201/ijisae.2017533858

    Load forecasting is very important to manage the electrical power systems. Load forecasting can be analyzed in three different ways as short-term, medium-term and long-term. Long-term load forecasting (LTLF) is in need to plan and carry on future energy demand and investment such as size of energy plant. LTLF is affected by energy consumption, national incoming per year, rates of civilization, increasing population rates and moreover economical parameters. Some of the forecasting models use mathematical formulas and statistical models such as correlation and regression analysis. In this study, a new effective expert-supported dynamic programming algorithm (ESDP) has been improved. Additionally, adaptive neuro-fuzzy inference system (ANFIS) and mathematical modeling (MM) are used to forecast long term energy demand. ANFIS is one of the famous artificial intelligence and has widely used to solve forecasting problems in literature. In addition to numerical inputs, ANFIS has linguistics inputs. The results obtained from ESDP, ANFIS and MM are compared to show availability. In order to show error levels mean absolute percentage error (MAPE) and (MAE) are used. The obtained results show that the proposed algorithms are available.

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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017
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    International Journal of Intelligent Systems and Applications in Engineering
    Article . 2017 . Peer-reviewed
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    International Journal of Intelligent Systems and Applications in Engineering
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017
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      International Journal of Intelligent Systems and Applications in Engineering
      Article . 2017 . Peer-reviewed
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  • KOORDİNELİ PİYASA EKONOMİLERİNDE TARIM, ORMAN ALANLARI VE ENERJİ TÜKETİMİNİN ÇEVRESEL KALİTE ÜZERİNDEKİ ETKİSİ: AMPİRİK BİR ANALİZ

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:Mehmet Akif Ersoy Universitesi Iktisadi ve Idari Bilimler Fakultesi Dergisi
    Authors: Hüseyin Safa Ünal; Oğuz Yusuf ATASEL;

    doi: 10.30798/makuiibf.863178 , 10.60692/q5czb-bgp93 , 10.60692/xrq33-83p88

    Bu çalışma, 1990-2016 döneminde koordineli piyasa ekonomileri için tarımsal katma değerin, orman alanlarının, ekonomik büyümenin ve yenilenebilir ve yenilenemez enerji tüketiminin çevresel kalite üzerindeki etkisini panel Common Corelated Effects (CCE) modelini kullanarak incelemeyi amaçlamaktadır. Panel CCE modelinden elde edilen uzun dönem katsayılara göre orman alanlarının çevre kalitesini arttırdığı, başka bir ifadeyle karbondioksit emisyonunu azalttığı, yenilenemez enerji tüketiminin ve ekonomik büyümenin ise çevre kalitesi üzerinde negatif bir etki oluşturduğu tespit edilmiştir. Ayrıca, incelenen dönemde tarımsal katma değerin ve yenilenebilir enerji tüketiminin çevre kalitesi üzerinde bir etki oluşturmadığı görülmüştür. Son olarak değişkenler arasındaki nedensellik ilişkisi Dumitrescu–Hurlin testi ile araştırılmıştır. Uygulanan nedensellik testi ile tarım ile karbondioksit emisyonları, tarım ile yenilenemez enerji tüketimi, yenilenebilir enerji tüketimi ile yenilenemez enerji tüketimi arasında çift yönlü nedensellik ilişkisi elde edilmiştir.

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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022 . Peer-reviewed
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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
      Article . 2022 . Peer-reviewed
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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  • KOORDİNELİ PİYASA EKONOMİLERİNDE TARIM, ORMAN ALANLARI VE ENERJİ TÜKETİMİNİN ÇEVRESEL KALİTE ÜZERİNDEKİ ETKİSİ: AMPİRİK BİR ANALİZ

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:Mehmet Akif Ersoy Universitesi Iktisadi ve Idari Bilimler Fakultesi Dergisi
    Authors: Hüseyin Safa Ünal; Oğuz Yusuf ATASEL;

    doi: 10.30798/makuiibf.863178 , 10.60692/q5czb-bgp93 , 10.60692/xrq33-83p88

    Bu çalışma, 1990-2016 döneminde koordineli piyasa ekonomileri için tarımsal katma değerin, orman alanlarının, ekonomik büyümenin ve yenilenebilir ve yenilenemez enerji tüketiminin çevresel kalite üzerindeki etkisini panel Common Corelated Effects (CCE) modelini kullanarak incelemeyi amaçlamaktadır. Panel CCE modelinden elde edilen uzun dönem katsayılara göre orman alanlarının çevre kalitesini arttırdığı, başka bir ifadeyle karbondioksit emisyonunu azalttığı, yenilenemez enerji tüketiminin ve ekonomik büyümenin ise çevre kalitesi üzerinde negatif bir etki oluşturduğu tespit edilmiştir. Ayrıca, incelenen dönemde tarımsal katma değerin ve yenilenebilir enerji tüketiminin çevre kalitesi üzerinde bir etki oluşturmadığı görülmüştür. Son olarak değişkenler arasındaki nedensellik ilişkisi Dumitrescu–Hurlin testi ile araştırılmıştır. Uygulanan nedensellik testi ile tarım ile karbondioksit emisyonları, tarım ile yenilenemez enerji tüketimi, yenilenebilir enerji tüketimi ile yenilenemez enerji tüketimi arasında çift yönlü nedensellik ilişkisi elde edilmiştir.

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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
    Article . 2022 . Peer-reviewed
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    Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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      Mehmet Akif Ersoy Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi
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  • The Nexus among Civil Aviation, Energy Performance Efficiency and GDP in terms of Ecological Footprint: Evidence from France and Finland

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:EconJournals
    Authors: Erdal Dursun;

    doi: 10.32479/ijeep.13399 , 10.60692/pcxz3-br663 , 10.60692/dh081-asj15

    The major goal of this research paper is to determine the long-run linkage among variables and the impact of civil aviation, energy productivity (efficiency), economic growth (GDP), on ecological footprint through conducting the multivariate regression method, Phillips‑Ouliaris and Engle‑Granger, Jarque – Bera Normality, and Cusum tests from 1970 to 2020. According to results of multivariate regression method, civil aviation, energy efficiency, and economic growth affect the ecological footprint from 1970 to 2020 in France which is coincide with Phillips‑Ouliaris and Engle‑Granger tests. On the contrary, there is no effect of independent variables on dependent variable (ecological footprint) in Finland which is consistent with Phillips‑Ouliaris and Engle‑Granger tests. In this respect, The long-run relation of the model is verified by the cointegration test of Engle-Granger and Phillips-Ouliaris for France. However, there is no long-run co-integration among variables for Finland from 1970-2020. To sum up, empirical results of France is verified EKC hypothesis. However, EKC hypothesis is not verified for Finland.

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    International Journal of Energy Economics and Policy
    Article . 2022 . Peer-reviewed
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  • The Nexus among Civil Aviation, Energy Performance Efficiency and GDP in terms of Ecological Footprint: Evidence from France and Finland

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:EconJournals
    Authors: Erdal Dursun;

    doi: 10.32479/ijeep.13399 , 10.60692/pcxz3-br663 , 10.60692/dh081-asj15

    The major goal of this research paper is to determine the long-run linkage among variables and the impact of civil aviation, energy productivity (efficiency), economic growth (GDP), on ecological footprint through conducting the multivariate regression method, Phillips‑Ouliaris and Engle‑Granger, Jarque – Bera Normality, and Cusum tests from 1970 to 2020. According to results of multivariate regression method, civil aviation, energy efficiency, and economic growth affect the ecological footprint from 1970 to 2020 in France which is coincide with Phillips‑Ouliaris and Engle‑Granger tests. On the contrary, there is no effect of independent variables on dependent variable (ecological footprint) in Finland which is consistent with Phillips‑Ouliaris and Engle‑Granger tests. In this respect, The long-run relation of the model is verified by the cointegration test of Engle-Granger and Phillips-Ouliaris for France. However, there is no long-run co-integration among variables for Finland from 1970-2020. To sum up, empirical results of France is verified EKC hypothesis. However, EKC hypothesis is not verified for Finland.

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    International Journal of Energy Economics and Policy
    Article . 2022 . Peer-reviewed
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  • Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy Mg50Ni50

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    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2024Publisher:Elsevier BV
    Authors: Chaker Briki; Maha M. Almoneef; Abdelhakim Settar; Mbarek Mohamed; +1 Authors

    doi: 10.1016/j.heliyon.2024.e31019

    pmid: 38803923

    pmc: PMC11128885

    In the present study, we explored the temperature evolution and hydrogen desorption properties of the Mg50Ni50 alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar. Simultaneously, a mathematical approach was employed to numerically investigate the temperature evolution within the hydride bed. Using COMSOL Multiphysics as a simulator, a numerical simulation was conducted based on experimental data. The study examined the impact of cooling temperature on hydride temperature evolution. Results revealed that hydrogen desorption kinetics of the amorphous Mg50Ni50 alloy are more significant compared to those of Mg2Ni compounds. Moreover, the effect of the warming temperature on the equilibrium pressure can also be observed in the hydrogen desorption isotherm curves. The experimental study of the Mg50Ni50 alloy provided activation energy data, along with determination of hydride formation enthalpy and entropy. On the other hand, we showed that the hydride temperature is maximum at the hydride-hydrogen interface within the hydride center.

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    License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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      License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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  • Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy Mg50Ni50

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 2024Publisher:Elsevier BV
    Authors: Chaker Briki; Maha M. Almoneef; Abdelhakim Settar; Mbarek Mohamed; +1 Authors

    doi: 10.1016/j.heliyon.2024.e31019

    pmid: 38803923

    pmc: PMC11128885

    In the present study, we explored the temperature evolution and hydrogen desorption properties of the Mg50Ni50 alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar. Simultaneously, a mathematical approach was employed to numerically investigate the temperature evolution within the hydride bed. Using COMSOL Multiphysics as a simulator, a numerical simulation was conducted based on experimental data. The study examined the impact of cooling temperature on hydride temperature evolution. Results revealed that hydrogen desorption kinetics of the amorphous Mg50Ni50 alloy are more significant compared to those of Mg2Ni compounds. Moreover, the effect of the warming temperature on the equilibrium pressure can also be observed in the hydrogen desorption isotherm curves. The experimental study of the Mg50Ni50 alloy provided activation energy data, along with determination of hydride formation enthalpy and entropy. On the other hand, we showed that the hydride temperature is maximum at the hydride-hydrogen interface within the hydride center.

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    License: http://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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  • High Tap Density Li4Ti5O12 Microspheres: Synthetic Conditions and Advanced Electrochemical Performance

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017 Saudi Arabia Publisher:Wiley
    Authors: Junwei Zheng; Qun Zhou; Jianxin Ren; Zhenyong Jia; +4 Authors

    doi: 10.1002/ente.201700069

    handle: 10754/623089

    AbstractPreparation of uniform, spherical Li4Ti5O12 with high tap density is significant to achieve a high volumetric energy density in lithium‐ion batteries. Herein, Li4Ti5O12 microspheres with variable tap density and tunable size distribution were synthesized by a newly designed industrial spray‐drying approach. The slurry concentration, sintering time, sintering conditions after spraying, and the effect of lithium/titanium molar ratio on the lithium‐ion (Li+) storage capability were investigated. A narrow particle size distribution of around 10 μm and a high tap density close to 1.4 g cm−3 of the Li4Ti5O12 spheres can be obtained under the optimized conditions. The Li4Ti5O12 spheres can deliver a much higher capacity of 168 mAh g−1 at a rate of 1 C and show a high capacity retention of 97.7 % over 400 cycles. The synthetic conditions are confirmed to be critical for improving the electron conductivity and Li+ diffusivity by adjusting the crystal and spatial structures. As‐prepared high‐performance Li4Ti5O12 is an ideal electrode for lithium‐ion batteries or capacitors; meanwhile, the presented approach is also applicable for preparing other kind of spherical materials.

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  • High Tap Density Li4Ti5O12 Microspheres: Synthetic Conditions and Advanced Electrochemical Performance

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2017 Saudi Arabia Publisher:Wiley
    Authors: Junwei Zheng; Qun Zhou; Jianxin Ren; Zhenyong Jia; +4 Authors

    doi: 10.1002/ente.201700069

    handle: 10754/623089

    AbstractPreparation of uniform, spherical Li4Ti5O12 with high tap density is significant to achieve a high volumetric energy density in lithium‐ion batteries. Herein, Li4Ti5O12 microspheres with variable tap density and tunable size distribution were synthesized by a newly designed industrial spray‐drying approach. The slurry concentration, sintering time, sintering conditions after spraying, and the effect of lithium/titanium molar ratio on the lithium‐ion (Li+) storage capability were investigated. A narrow particle size distribution of around 10 μm and a high tap density close to 1.4 g cm−3 of the Li4Ti5O12 spheres can be obtained under the optimized conditions. The Li4Ti5O12 spheres can deliver a much higher capacity of 168 mAh g−1 at a rate of 1 C and show a high capacity retention of 97.7 % over 400 cycles. The synthetic conditions are confirmed to be critical for improving the electron conductivity and Li+ diffusivity by adjusting the crystal and spatial structures. As‐prepared high‐performance Li4Ti5O12 is an ideal electrode for lithium‐ion batteries or capacitors; meanwhile, the presented approach is also applicable for preparing other kind of spherical materials.

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  • Isı pompalı fotovoltaik/termal bütünleşik sistemin termodinamik analizi ve deneysel incelenmesi

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Doctoral thesis 2020 Turkey Publisher:Fen Bilimleri Enstitüsü
    Authors: Kırtepe, Erhan;

    handle: 11454/58323

    In this thesis, the design, installation and experimental analysis of the Heat Pump-Photovoltaic/Thermal (HP-PV/T) integrated system were carried out. This system can perform many functions such as electricity generation, space heating, space cooling and hot water storage for use. In addition, this system can be used all year round in different seasons and modes (heating mode and cooling mode). The main components used in the system are heat pump, PV/T collectors, balancing tanks, hot water tank, chiller, pumps and measuring instruments.In the first section of this thesis, an introduction has been made about the subject examined and in the second section, the studies on the subject in the literature have been mentioned. In the third section, detailed information about the calculation steps of the developed mathematical model of PV/T collectors used in the system is given. In the fourth section, information is given about the experimental setup and each component used in the experimental setup. In the fifth section, energy analysis has been carried out in detail for each component calculated in the experimental setup. In the sixth section, uncertainty analysis is performed on the results obtained from experimental analysis. In the seventh section, the results and evaluations obtained from the experimental study are mentioned. The results of the experimental study conducted in this section were analyzed in detail and the utilization rate of the system was found hourly for each experiment. In addition, in this section, the results obtained from the mathematical model developed for PV/T collectors and the results obtained from the experimental study were compared using Mean Bias Error (MBE), Root Mean Square Error (RMSE), Correlation Coefficient (CC) and Mean Percentage Error (MPE) statistical methods. In the last section, which is the eighth, a general evaluation of the results has been made and suggestions have been made for similar studies to be carried out in the future.In the uncertainty analysis performed for the results obtained from the experimental analysis, it was found that the values found experimentally had an uncertainty value of 2.83% to 7.72%. Since the temperature of the panel surface is kept low with the use of PV/T collectors, It has been determined that the efficiency losses that occur as the temperature rises in the PV panels are prevented to produce more electrical energy at rates ranging from 3.23% to 17.18% per hour. As a result of the hourly analysis, it has been determined that the coefficient of performance obtained by using the heat pump integrated with PV/T collectors is more than 2.83% to 22.02% compared to the heating coefficient of performance of the heat pump. Experimental analysis of the HP-PV/T integrated system on different days and in different modes was carried out and it was observed that the utilization rate of the system ranged from 1.151 to 2.581 as a result of hourly evaluations. Bu tez çalışması kapsamında, Isı Pompalı-Fotovoltaik/Termal (IP-PV/T) bütünleşik sistemin tasarımı, kurulumu ve deneysel analizi gerçekleştirilmiştir. Bu sistem elektrik üretimi, hacim ısıtma, hacim soğutma ve kullanım amaçlı sıcak su depolama gibi birçok işlevi yapabilmektedir. Ayrıca bu sistem tüm yıl boyunca farklı mevsimlerde ve modlarda (ısıtma modu ve soğutma modu) çalıştırılarak kullanılabilmektedir. Sistemde kullanılan en temel bileşenler ısı pompası, PV/T kolektörler, dengeleme tankları, sıcak su deposu, su soğutma grubu, pompalar ve ölçüm aletleridir. Bu tez çalışmasının ilk bölümünde incelenen konu hakkında bir giriş yapılmış ve ikinci bölümde bu konu ile ilgili literatürde yapılan çalışmalara değinilmiştir. Üçüncü bölümde sistemde kullanılan PV/T kolektörlere ait geliştirilen matematiksel modelin hesaplama adımları ile ilgili ayrıntılı bilgiler verilmiştir. Dördüncü bölümde kurulan deney düzeneği ve deney düzeneğinde kullanılan her bir bileşen hakkında bilgi verilmiştir. Beşinci bölümde deney düzeneğinde hesaplama yapılan her bir bileşen için ayrıntılı olarak enerji analizi gerçekleştirilmiştir. Altıncı bölümde deneysel analizlerden elde edilen sonuçlara dair hata analizi yapılmıştır. Yedinci bölümde yapılan deneysel çalışmadan elde edilen bulgulara ve değerlendirmelere değinilmiştir. Bu bölümde yapılan deneysel çalışma sonuçları ayrıntılı bir şekilde analiz edilmiş ve sistemin faydalanma oranı her bir deney için saatlik olarak bulunmuştur. Bunlara ek olarak bu bölümde PV/T kolektörlerle ilgili geliştirilen matematiksel modelden elde edilen sonuçlar ile deneysel çalışmadan elde edilen sonuçlar ortalama sistematik hata (OSH), hataların ortalama karekökü (HOK), korelasyon katsayısı (KK) ve ortalama yüzde hata (OYH) istatistiksel yöntemleri kullanılarak karşılaştırılmıştır. Sekizinci olan son bölümde ise sonuçların genel bir değerlendirmesi yapılmış ve sonraki yapılacak benzer çalışmalar için öneriler getirilmiştir. Deneysel analizlerden elde edilen sonuçlar için yapılan hata analizinde deneysel olarak bulunan değerlerin %2,83 ila %7,72 belirsizlik değerine sahip oldukları görülmüştür. PV/T kolektörlerin kullanılması ile panel yüzeyinin sıcaklığı düşük tutulduğu için, PV panellerdeki sıcaklık yükseldikçe ortaya çıkan verim kayıplarının önüne geçilerek saatlik olarak %3,23 ila %17,18 arasında değişen oranlarda daha fazla elektrik enerjisi ürettiği tespit edilmiştir. Saatlik olarak yapılan analizler sonucunda ısı pompasının PV/T kolektörler ile entegre bir şekilde kullanılması ile elde edilen etkinlik katsayısının, ısı pompasının ısıtma etkinlik katsayısına göre %2,83 ila %22,02 arasında değişen oranlarda daha fazla olduğu belirlenmiştir. IP-PV/T bütünleşik sistemin farklı günlerde ve farklı modlarda deneysel analizleri gerçekleştirilmiş ve yapılan saatlik değerlendirmeler neticesinde sistemden elde edilen faydalanma oranının 1,151 ila 2,581 arasında değiştiği görülmüştür. 161

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    Doctoral thesis . 2020
    License: CC BY
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  • Isı pompalı fotovoltaik/termal bütünleşik sistemin termodinamik analizi ve deneysel incelenmesi

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Doctoral thesis 2020 Turkey Publisher:Fen Bilimleri Enstitüsü
    Authors: Kırtepe, Erhan;

    handle: 11454/58323

    In this thesis, the design, installation and experimental analysis of the Heat Pump-Photovoltaic/Thermal (HP-PV/T) integrated system were carried out. This system can perform many functions such as electricity generation, space heating, space cooling and hot water storage for use. In addition, this system can be used all year round in different seasons and modes (heating mode and cooling mode). The main components used in the system are heat pump, PV/T collectors, balancing tanks, hot water tank, chiller, pumps and measuring instruments.In the first section of this thesis, an introduction has been made about the subject examined and in the second section, the studies on the subject in the literature have been mentioned. In the third section, detailed information about the calculation steps of the developed mathematical model of PV/T collectors used in the system is given. In the fourth section, information is given about the experimental setup and each component used in the experimental setup. In the fifth section, energy analysis has been carried out in detail for each component calculated in the experimental setup. In the sixth section, uncertainty analysis is performed on the results obtained from experimental analysis. In the seventh section, the results and evaluations obtained from the experimental study are mentioned. The results of the experimental study conducted in this section were analyzed in detail and the utilization rate of the system was found hourly for each experiment. In addition, in this section, the results obtained from the mathematical model developed for PV/T collectors and the results obtained from the experimental study were compared using Mean Bias Error (MBE), Root Mean Square Error (RMSE), Correlation Coefficient (CC) and Mean Percentage Error (MPE) statistical methods. In the last section, which is the eighth, a general evaluation of the results has been made and suggestions have been made for similar studies to be carried out in the future.In the uncertainty analysis performed for the results obtained from the experimental analysis, it was found that the values found experimentally had an uncertainty value of 2.83% to 7.72%. Since the temperature of the panel surface is kept low with the use of PV/T collectors, It has been determined that the efficiency losses that occur as the temperature rises in the PV panels are prevented to produce more electrical energy at rates ranging from 3.23% to 17.18% per hour. As a result of the hourly analysis, it has been determined that the coefficient of performance obtained by using the heat pump integrated with PV/T collectors is more than 2.83% to 22.02% compared to the heating coefficient of performance of the heat pump. Experimental analysis of the HP-PV/T integrated system on different days and in different modes was carried out and it was observed that the utilization rate of the system ranged from 1.151 to 2.581 as a result of hourly evaluations. Bu tez çalışması kapsamında, Isı Pompalı-Fotovoltaik/Termal (IP-PV/T) bütünleşik sistemin tasarımı, kurulumu ve deneysel analizi gerçekleştirilmiştir. Bu sistem elektrik üretimi, hacim ısıtma, hacim soğutma ve kullanım amaçlı sıcak su depolama gibi birçok işlevi yapabilmektedir. Ayrıca bu sistem tüm yıl boyunca farklı mevsimlerde ve modlarda (ısıtma modu ve soğutma modu) çalıştırılarak kullanılabilmektedir. Sistemde kullanılan en temel bileşenler ısı pompası, PV/T kolektörler, dengeleme tankları, sıcak su deposu, su soğutma grubu, pompalar ve ölçüm aletleridir. Bu tez çalışmasının ilk bölümünde incelenen konu hakkında bir giriş yapılmış ve ikinci bölümde bu konu ile ilgili literatürde yapılan çalışmalara değinilmiştir. Üçüncü bölümde sistemde kullanılan PV/T kolektörlere ait geliştirilen matematiksel modelin hesaplama adımları ile ilgili ayrıntılı bilgiler verilmiştir. Dördüncü bölümde kurulan deney düzeneği ve deney düzeneğinde kullanılan her bir bileşen hakkında bilgi verilmiştir. Beşinci bölümde deney düzeneğinde hesaplama yapılan her bir bileşen için ayrıntılı olarak enerji analizi gerçekleştirilmiştir. Altıncı bölümde deneysel analizlerden elde edilen sonuçlara dair hata analizi yapılmıştır. Yedinci bölümde yapılan deneysel çalışmadan elde edilen bulgulara ve değerlendirmelere değinilmiştir. Bu bölümde yapılan deneysel çalışma sonuçları ayrıntılı bir şekilde analiz edilmiş ve sistemin faydalanma oranı her bir deney için saatlik olarak bulunmuştur. Bunlara ek olarak bu bölümde PV/T kolektörlerle ilgili geliştirilen matematiksel modelden elde edilen sonuçlar ile deneysel çalışmadan elde edilen sonuçlar ortalama sistematik hata (OSH), hataların ortalama karekökü (HOK), korelasyon katsayısı (KK) ve ortalama yüzde hata (OYH) istatistiksel yöntemleri kullanılarak karşılaştırılmıştır. Sekizinci olan son bölümde ise sonuçların genel bir değerlendirmesi yapılmış ve sonraki yapılacak benzer çalışmalar için öneriler getirilmiştir. Deneysel analizlerden elde edilen sonuçlar için yapılan hata analizinde deneysel olarak bulunan değerlerin %2,83 ila %7,72 belirsizlik değerine sahip oldukları görülmüştür. PV/T kolektörlerin kullanılması ile panel yüzeyinin sıcaklığı düşük tutulduğu için, PV panellerdeki sıcaklık yükseldikçe ortaya çıkan verim kayıplarının önüne geçilerek saatlik olarak %3,23 ila %17,18 arasında değişen oranlarda daha fazla elektrik enerjisi ürettiği tespit edilmiştir. Saatlik olarak yapılan analizler sonucunda ısı pompasının PV/T kolektörler ile entegre bir şekilde kullanılması ile elde edilen etkinlik katsayısının, ısı pompasının ısıtma etkinlik katsayısına göre %2,83 ila %22,02 arasında değişen oranlarda daha fazla olduğu belirlenmiştir. IP-PV/T bütünleşik sistemin farklı günlerde ve farklı modlarda deneysel analizleri gerçekleştirilmiş ve yapılan saatlik değerlendirmeler neticesinde sistemden elde edilen faydalanma oranının 1,151 ila 2,581 arasında değiştiği görülmüştür. 161

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ YÖK Açık Bilim - CoH...arrow_drop_down
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    YÖK Açık Bilim - CoHE Open Science
    Doctoral thesis . 2020
    License: CC BY
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      YÖK Açık Bilim - CoHE Open Science
      Doctoral thesis . 2020
      License: CC BY
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  • Optimal orientation angles for maximizing energy yield for solar PV in Saudi Arabia

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2019 Canada Publisher:Elsevier BV
    Authors: Hassan Z. Al Garni; Hassan Z. Al Garni; David Wright; Anjali Awasthi;

    doi: 10.1016/j.renene.2018.10.048

    Abstract This paper uses research-quality, ground measurements of irradiance and temperature that are accurate to ±2% to estimate the electric energy yield of fixed solar modules for utility-scale solar power plants at 18 sites in Saudi Arabia. The calculation is performed for a range of tilt and azimuth angles and the orientation that gives the optimum annual energy yield is determined. A detailed analysis is presented for Riyadh including the impact of non-optimal tilt and azimuth angles on annual energy yield. It is also found that energy yield in March and October are higher than in April and September, due to milder operating temperatures of the modules. A similar optimization of tilt and azimuth is performed each month separately. Adjusting the orientation each month increases energy yield by 4.01% compared to the annual optimum, but requires considerable labour cost. Further analysis shows that an increase in energy yield of 3.63% can be obtained by adjusting the orientation at five selected times during the year, thus significantly reducing the labour requirement. The optimal orientation and corresponding energy yield for all 18 sites is combined with a site suitability analysis taking into account climate, topography and proximity to roads, transmission lines and protected areas. Six sites are selected as having high suitability and high energy yield: Albaha, Arar, Hail, Riyadh, Tabuk and Taif. For these cities the optimal tilt is only slightly higher than the latitude, however the optimum azimuth is from 20° to 53° west of south due to an asymmetrical daily irradiance profile.

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    Renewable Energy
    Article
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    Article . 2018
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    Renewable Energy
    Article . 2019 . Peer-reviewed
    License: Elsevier TDM
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  • Optimal orientation angles for maximizing energy yield for solar PV in Saudi Arabia

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2019 Canada Publisher:Elsevier BV
    Authors: Hassan Z. Al Garni; Hassan Z. Al Garni; David Wright; Anjali Awasthi;

    doi: 10.1016/j.renene.2018.10.048

    Abstract This paper uses research-quality, ground measurements of irradiance and temperature that are accurate to ±2% to estimate the electric energy yield of fixed solar modules for utility-scale solar power plants at 18 sites in Saudi Arabia. The calculation is performed for a range of tilt and azimuth angles and the orientation that gives the optimum annual energy yield is determined. A detailed analysis is presented for Riyadh including the impact of non-optimal tilt and azimuth angles on annual energy yield. It is also found that energy yield in March and October are higher than in April and September, due to milder operating temperatures of the modules. A similar optimization of tilt and azimuth is performed each month separately. Adjusting the orientation each month increases energy yield by 4.01% compared to the annual optimum, but requires considerable labour cost. Further analysis shows that an increase in energy yield of 3.63% can be obtained by adjusting the orientation at five selected times during the year, thus significantly reducing the labour requirement. The optimal orientation and corresponding energy yield for all 18 sites is combined with a site suitability analysis taking into account climate, topography and proximity to roads, transmission lines and protected areas. Six sites are selected as having high suitability and high energy yield: Albaha, Arar, Hail, Riyadh, Tabuk and Taif. For these cities the optimal tilt is only slightly higher than the latitude, however the optimum azimuth is from 20° to 53° west of south due to an asymmetrical daily irradiance profile.

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    Article . 2018
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    Renewable Energy
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  • Yol ve Yol-Dışı Yüzeylerde Taşıt Dinamiği Benzetimleri – Karşılaştırmalı Bir Analiz

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    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2018Publisher:Sakarya University Journal of Science
    Authors: Erdem Uzunsoy;

    doi: 10.16984/saufenbilder.333872

    Tasit dinamigi modellemelerinde kullanilan lastik modelleri genellikle tasitlarin ozel olarak insa edilmis ve tutunmaya yonelik ozellikleri tanimlanmis yollar uzerindeki davranislarina dayali gelistirilmis modellerdir. Yol ve yol disi surulebilen tasitlarin her iki farkli yuzey uzerindeki davranislari ise degiskendir. Bu calismada; hem yol hem de yol disi olarak uyarlanabilen bir lastik modeli temelinde standart tasit dinamigi manevralari uzerinden simulatif karsilastirmalarla gercekte olan ya da karsilasilabilen durumlara bir yaklasim gosterilmektedir. Modelleme ve simulasyon ortami olarak Matlab/Simulink kullanilmistir.

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  • Yol ve Yol-Dışı Yüzeylerde Taşıt Dinamiği Benzetimleri – Karşılaştırmalı Bir Analiz

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2018Publisher:Sakarya University Journal of Science
    Authors: Erdem Uzunsoy;

    doi: 10.16984/saufenbilder.333872

    Tasit dinamigi modellemelerinde kullanilan lastik modelleri genellikle tasitlarin ozel olarak insa edilmis ve tutunmaya yonelik ozellikleri tanimlanmis yollar uzerindeki davranislarina dayali gelistirilmis modellerdir. Yol ve yol disi surulebilen tasitlarin her iki farkli yuzey uzerindeki davranislari ise degiskendir. Bu calismada; hem yol hem de yol disi olarak uyarlanabilen bir lastik modeli temelinde standart tasit dinamigi manevralari uzerinden simulatif karsilastirmalarla gercekte olan ya da karsilasilabilen durumlara bir yaklasim gosterilmektedir. Modelleme ve simulasyon ortami olarak Matlab/Simulink kullanilmistir.

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  • COMPARSION OF BIODIESEL AND ETHANOL AS AN ALTERNATIVE DIESEL ENGINE FUEL

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    descriptionPublicationkeyboard_double_arrow_right Article 2005 Turkey Publisher:Pamukkale University
    Authors: Usta, Nazım; Can, Özer; Öztürk, Erkan;

    handle: 11499/39606

    Biodiesel and ethanol are alternative renewable diesel engine fuels and their mixtures with diesel fuel No. 2 at different proportions can be used in diesel engines. Although ethanol is unique chemical molecule and has certain specifications, specifications of biodiesel may vary depending on type of the oil used in the production and esterification technique. In this study, the specifications of ethanol and two different biodiesels were compared with those of diesel fuel No. 2. Effects of ethanol and the biodiesels on performance and emissions of a turbocharged indirect injection diesel engine were investigated. The alternative fuels used in the experiments caused increase in NOx emission, while they reduced CO, soot and SO2 emissions. Although ethanol addition caused some power reduction, the biodiesel addition resulted in slightly higher power with respect to the diesel fuel. Biyodizel ve etanol, dizel motorlar için yenilenebilir alternatif yakıtlardır ve farklı oranlarda No. 2 dizel yakıta karıştırılarak dizel motorlarda kullanılabilirler. Etanol tek bir kimyasal yapıya ve belli özelliklere sahip yakıt olmasına rağmen, biyodizellerin özellikleri elde edildikleri yağın cinsine ve esterleştirme metodlarına bağlı olarak değişmektedir. Bu çalışmada etanol ve iki farklı biyodizelin özellikleri No. 2 dizel yakıt ile karşılaştırılmış, etanol ve biyodizellerin ön yanma odalı turbo dizel bir motorun performans ve emisyonlarına etkileri incelenmiştir. Kullanılan alternatif yakıtlar CO, is ve SO2 emisyonlarının azalmasını sağlarken, NOx emisyonunda artışa sebep olmuştur. Etanol ilavesi güçte bir miktar düşmeye sebep olurken, biyodizel ilavesi dizel yakıta göre çok az oranda güç artışı sağlamıştır.

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    Article . 2005
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    Article . 2005
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    Article . 2005 . Peer-reviewed
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  • COMPARSION OF BIODIESEL AND ETHANOL AS AN ALTERNATIVE DIESEL ENGINE FUEL

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    descriptionPublicationkeyboard_double_arrow_right Article 2005 Turkey Publisher:Pamukkale University
    Authors: Usta, Nazım; Can, Özer; Öztürk, Erkan;

    handle: 11499/39606

    Biodiesel and ethanol are alternative renewable diesel engine fuels and their mixtures with diesel fuel No. 2 at different proportions can be used in diesel engines. Although ethanol is unique chemical molecule and has certain specifications, specifications of biodiesel may vary depending on type of the oil used in the production and esterification technique. In this study, the specifications of ethanol and two different biodiesels were compared with those of diesel fuel No. 2. Effects of ethanol and the biodiesels on performance and emissions of a turbocharged indirect injection diesel engine were investigated. The alternative fuels used in the experiments caused increase in NOx emission, while they reduced CO, soot and SO2 emissions. Although ethanol addition caused some power reduction, the biodiesel addition resulted in slightly higher power with respect to the diesel fuel. Biyodizel ve etanol, dizel motorlar için yenilenebilir alternatif yakıtlardır ve farklı oranlarda No. 2 dizel yakıta karıştırılarak dizel motorlarda kullanılabilirler. Etanol tek bir kimyasal yapıya ve belli özelliklere sahip yakıt olmasına rağmen, biyodizellerin özellikleri elde edildikleri yağın cinsine ve esterleştirme metodlarına bağlı olarak değişmektedir. Bu çalışmada etanol ve iki farklı biyodizelin özellikleri No. 2 dizel yakıt ile karşılaştırılmış, etanol ve biyodizellerin ön yanma odalı turbo dizel bir motorun performans ve emisyonlarına etkileri incelenmiştir. Kullanılan alternatif yakıtlar CO, is ve SO2 emisyonlarının azalmasını sağlarken, NOx emisyonunda artışa sebep olmuştur. Etanol ilavesi güçte bir miktar düşmeye sebep olurken, biyodizel ilavesi dizel yakıta göre çok az oranda güç artışı sağlamıştır.

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    Pamukkale University Journal of Engineering Sciences
    Article . 2005
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    Pamukkale GCRIS Database
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    Pamukkale University Journal of Engineering Sciences
    Article . 2005 . Peer-reviewed
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  • Evaluation of the proximity effect on flow-accelerated corrosion

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2010Publisher:Elsevier BV
    Authors: Wael H. Ahmed;

    doi: 10.1016/j.anucene.2009.12.020

    Abstract Flow-accelerated corrosion (FAC) is a degradation mechanism that affects carbon steel piping in power plants. The failures and degradation due to FAC have necessitated numerous replacements in many power plants. Several computer codes around the world were developed as part of a systematic program or process to control FAC in power plant utilities. The typical plant model requires the input of the flow parameters, piping configuration and the plant water chemistry. The results on FAC rate are considered the key to proper selection of components for inspection. The lack of information on the effect of the upstream components located in the proximity limited the accuracy of the FAC prediction tools and hence will affect the accuracy in identifying potential inspection locations. In the present study 211 inspection data for 90° carbon steel elbows from several nuclear power plants were used to determine the effect of the proximity between two components on the FAC wear rate. The effect of the velocity as well as the distance between the elbows and the upstream components is discussed in the present analysis. Based on the analyzed trends obtained from the inspection data, significant increase in the wear rate of approximately 70% on average is identified to be due to the proximity.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
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    Annals of Nuclear Energy
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • Evaluation of the proximity effect on flow-accelerated corrosion

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    descriptionPublicationkeyboard_double_arrow_right Article , Journal 2010Publisher:Elsevier BV
    Authors: Wael H. Ahmed;

    doi: 10.1016/j.anucene.2009.12.020

    Abstract Flow-accelerated corrosion (FAC) is a degradation mechanism that affects carbon steel piping in power plants. The failures and degradation due to FAC have necessitated numerous replacements in many power plants. Several computer codes around the world were developed as part of a systematic program or process to control FAC in power plant utilities. The typical plant model requires the input of the flow parameters, piping configuration and the plant water chemistry. The results on FAC rate are considered the key to proper selection of components for inspection. The lack of information on the effect of the upstream components located in the proximity limited the accuracy of the FAC prediction tools and hence will affect the accuracy in identifying potential inspection locations. In the present study 211 inspection data for 90° carbon steel elbows from several nuclear power plants were used to determine the effect of the proximity between two components on the FAC wear rate. The effect of the velocity as well as the distance between the elbows and the upstream components is discussed in the present analysis. Based on the analyzed trends obtained from the inspection data, significant increase in the wear rate of approximately 70% on average is identified to be due to the proximity.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Annals of Nuclear En...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Annals of Nuclear Energy
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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