{"title":"Energy and Exergy Analysis of Diesel-Hydrogen and Diesel-Ammonia Fuel Blends in Diesel Engine","authors":"Kubilay Bayramoğlu","doi":"10.4274/jems.2024.46503","DOIUrl":"https://doi.org/10.4274/jems.2024.46503","url":null,"abstract":"","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141378553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmed S.A. Ibrahim, Anas M. El Molla, Hany G. I. Ahmed
Within the framework of constructing mega coastal ports in Egypt, this research aims to achieve coastal management sustainability in its surroundings by modeling the Longshore Sediment Transport “LST”. The literature in the fields of modeling and sediment transport was reviewed and scrutinized. The model was calibrated by contrasting the calculated wave data against 2003 measured data at the Damietta Buoy. The model inputs were tuned to produce a result that was similar to the observed data. Moreover, the model results were validated against 2005 measured data at the Damietta Buoy. Likewise, MIKE21 SM was used to estimate 2011 bed levels within Damietta Port, where 2010 bathymetrical survey data were used. Confident with the model results, it was employed to synthesize transport data for 1940-2020 in terms of LST, Gross LST “GLST” and Net LST “NLST” while considering human intervention and implementing ERA5 wave data. Results were obtained and analyzed, and there was a significant correlation between the significant wave height “Hs” and the wave period “Tp” and GLST (i.e. R=0.91-0.79, respectively). The analyzed trend results highlighted that in the pre-construction phase of Damietta Port, increases in GLST and NLST were modest (1139.9 and 243.7 m 3 /year, respectively). However, in the post-construction phase of Damietta Port, they escalated between 4679.47 and 3962 m 3 /year. The analyzed results indicated that after introducing coastal protection, GLST and NLST decreased to 2978.1 and 2176 m 3 /year, respectively.
{"title":"Modeling Longshore Sediment Transport for Sustainable Coastal Management in the Damietta Port Area","authors":"Ahmed S.A. Ibrahim, Anas M. El Molla, Hany G. I. Ahmed","doi":"10.4274/jems.2024.35119","DOIUrl":"https://doi.org/10.4274/jems.2024.35119","url":null,"abstract":"Within the framework of constructing mega coastal ports in Egypt, this research aims to achieve coastal management sustainability in its surroundings by modeling the Longshore Sediment Transport “LST”. The literature in the fields of modeling and sediment transport was reviewed and scrutinized. The model was calibrated by contrasting the calculated wave data against 2003 measured data at the Damietta Buoy. The model inputs were tuned to produce a result that was similar to the observed data. Moreover, the model results were validated against 2005 measured data at the Damietta Buoy. Likewise, MIKE21 SM was used to estimate 2011 bed levels within Damietta Port, where 2010 bathymetrical survey data were used. Confident with the model results, it was employed to synthesize transport data for 1940-2020 in terms of LST, Gross LST “GLST” and Net LST “NLST” while considering human intervention and implementing ERA5 wave data. Results were obtained and analyzed, and there was a significant correlation between the significant wave height “Hs” and the wave period “Tp” and GLST (i.e. R=0.91-0.79, respectively). The analyzed trend results highlighted that in the pre-construction phase of Damietta Port, increases in GLST and NLST were modest (1139.9 and 243.7 m 3 /year, respectively). However, in the post-construction phase of Damietta Port, they escalated between 4679.47 and 3962 m 3 /year. The analyzed results indicated that after introducing coastal protection, GLST and NLST decreased to 2978.1 and 2176 m 3 /year, respectively.","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An analysis of the damage caused to vessels by collisions shows that the wreck of most struck ships is mainly due to underwater damage developed because of the accident. Such damage is caused, as a rule, by the presence of bulbs on striking ships that have high longitudinal rigidity and strength exceeding the load-bearing capacity of the framing system several times. Scientists in many countries are looking for ways to reduce the consequences of collisions with ships that have bulbs. Based on the results of the research, schemes for modernizing the forward end of ship hulls by installing bulbs with increased longitudinal compliance to reduce the consequences of ship collisions were proposed, and recommendations were developed for the selection of their characteristics, which make it possible to avoid underwater holes on a struck ship. Bulbs with increased longitudinal compliance were designed using methods of plastic limit analysis. The effectiveness of a modernized deformable bow structure was studied using ANSYS LS-DYNA non-linear finite element method computations. The developed technical solutions ensure that in case of collision in the underwater part of a struck vessel, the deformations of the framing systems will remain insignificant, thereby avoiding the appearance of damage below the waterline.
{"title":"Development of Constructive Measures to Reduce the Consequences of Ship Collisions","authors":"Pavel Burakovskiy","doi":"10.4274/jems.2024.24582","DOIUrl":"https://doi.org/10.4274/jems.2024.24582","url":null,"abstract":"An analysis of the damage caused to vessels by collisions shows that the wreck of most struck ships is mainly due to underwater damage developed because of the accident. Such damage is caused, as a rule, by the presence of bulbs on striking ships that have high longitudinal rigidity and strength exceeding the load-bearing capacity of the framing system several times. Scientists in many countries are looking for ways to reduce the consequences of collisions with ships that have bulbs. Based on the results of the research, schemes for modernizing the forward end of ship hulls by installing bulbs with increased longitudinal compliance to reduce the consequences of ship collisions were proposed, and recommendations were developed for the selection of their characteristics, which make it possible to avoid underwater holes on a struck ship. Bulbs with increased longitudinal compliance were designed using methods of plastic limit analysis. The effectiveness of a modernized deformable bow structure was studied using ANSYS LS-DYNA non-linear finite element method computations. The developed technical solutions ensure that in case of collision in the underwater part of a struck vessel, the deformations of the framing systems will remain insignificant, thereby avoiding the appearance of damage below the waterline.","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141381127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Emrah Akdamar, E. F. Akgül, Maruf Göğebakan, Evrim Işık
Shipping and world trade have grown simultaneously as a result of the increased need for freight transportation capacity brought about by the expansion of world trade. It is important for countries to compare their maritime trade performance in relation to their respective characteristics. It is essential to adhere to the competitive circumstances in order to obtain a larger proportion of the world trade. This study compares maritime trade performance of the 20 countries with the greatest number of ports of call worldwide using multi criteria decision making techniques. Six indicators are weighted by Criteria Importance Through Intercriteria Correlation method and the performances of the countries are ranked by VIšeKriterijumska Optimizacija I Kompromisno Resenje method. Rankings for the years 2018-2022 were constructed independently, and after using the Borda approach to integrate them together, the final ranking was produced. The results provide a perspective for countries to improve their maritime trade performance and the opportunity to make an assessment from macro perspective
由于世界贸易的扩大导致对货运能力的需求增加，航运业和世界贸易同时增长。重要的是，各国应根据各自的特点比较其海运贸易业绩。为了在世界贸易中获得更大的份额，必须坚持竞争环境。本研究采用多标准决策技术，比较了全球停靠港口最多的 20 个国家的海上贸易绩效。通过标准间相关性的标准重要性法对六项指标进行加权，并通过 VIšeKriterijumska Optimizacija I Kompromisno Resenje 法对各国的表现进行排名。2018-2022 年的排名是独立构建的，在使用博尔达方法将它们整合在一起后，得出了最终排名。这些结果为各国改善其海上贸易绩效提供了一个视角，并为从宏观角度进行评估提供了机会
{"title":"Temporal Analysis of Factors Influencing Countries’ Maritime Trade Performance with CRITIC-based VIKOR Method","authors":"Emrah Akdamar, E. F. Akgül, Maruf Göğebakan, Evrim Işık","doi":"10.4274/jems.2024.55798","DOIUrl":"https://doi.org/10.4274/jems.2024.55798","url":null,"abstract":"Shipping and world trade have grown simultaneously as a result of the increased need for freight transportation capacity brought about by the expansion of world trade. It is important for countries to compare their maritime trade performance in relation to their respective characteristics. It is essential to adhere to the competitive circumstances in order to obtain a larger proportion of the world trade. This study compares maritime trade performance of the 20 countries with the greatest number of ports of call worldwide using multi criteria decision making techniques. Six indicators are weighted by Criteria Importance Through Intercriteria Correlation method and the performances of the countries are ranked by VIšeKriterijumska Optimizacija I Kompromisno Resenje method. Rankings for the years 2018-2022 were constructed independently, and after using the Borda approach to integrate them together, the final ranking was produced. The results provide a perspective for countries to improve their maritime trade performance and the opportunity to make an assessment from macro perspective","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper showcases a data-driven non-linear adaptive controller design employing an unfalsification approach to attain optimal estimates for unknown parameters in an autonomous underwater vehicle (AUV). These estimates are applied to the controller to enable precise trajectory tracking. The controller design presented is capable of adapting to parametric changes and uncertainties while fulfilling the desired performance criteria using an effective parameter update method of unfalsification. The results were validated through simulations conducted using MATLAB/SIMULINK
{"title":"Data-Driven Approach for Parameter Estimation and Control of an Autonomous Underwater Vehicle","authors":"Tabassum Rasul, Koena Mukherjee","doi":"10.4274/jems.2024.10438","DOIUrl":"https://doi.org/10.4274/jems.2024.10438","url":null,"abstract":"This paper showcases a data-driven non-linear adaptive controller design employing an unfalsification approach to attain optimal estimates for unknown parameters in an autonomous underwater vehicle (AUV). These estimates are applied to the controller to enable precise trajectory tracking. The controller design presented is capable of adapting to parametric changes and uncertainties while fulfilling the desired performance criteria using an effective parameter update method of unfalsification. The results were validated through simulations conducted using MATLAB/SIMULINK","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141380973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eralp Özkaya, Ali Yasin Kaya, Fatih Tonoğlu, Özkan Uğurlu, Jin Wang
In this study, exhaust emissions originating from purse seine fishing vessels were calculated. A bottom-up method based on ship activities was used for emission calculations. Necessary information for the calculations was obtained from the BAGIS (Fishing Vessels Monitoring System) system. Eighteen purse seiners in the Black Sea region with a length of 20 m or more engaged in fishing activities in the 2017-2018 fishing season were used as samples. These vessels were categorized into three different groups according to their length. The emissions produced by each length group were calculated separately under different conditions for vessels identified as “port”, “operation”, and “navigation”. The total emissions in the Black Sea region and Türkiye were estimated. This study provides emission estimates using operational conditions and real data from Turkish-flagged purse seiners engaged in fishing in the Black Sea. In this respect, this research presents novelty and addresses an important gap in the existing literature. The annual emission amount of purse seine fishing vessels in the Black Sea is 260,000 tons, while the annual emission amount from purse seine vessels throughout Türkiye has been calculated as 440,000 tons. As a result, the effectiveness of the Emission Control Area (ECA)/Sulphur ECA region implementation in reducing emissions from maritime activities has been demonstrated. In addition, this study constitutes a source for the exhaust emission inventory of purse seiners in the Black Sea region.
{"title":"Effect of Exhaust Emissions Produced by Fishing Vessels on Air Pollution: A Case Study of Purse Seine Vessels Operating in the Black Sea","authors":"Eralp Özkaya, Ali Yasin Kaya, Fatih Tonoğlu, Özkan Uğurlu, Jin Wang","doi":"10.4274/jems.2024.61214","DOIUrl":"https://doi.org/10.4274/jems.2024.61214","url":null,"abstract":"In this study, exhaust emissions originating from purse seine fishing vessels were calculated. A bottom-up method based on ship activities was used for emission calculations. Necessary information for the calculations was obtained from the BAGIS (Fishing Vessels Monitoring System) system. Eighteen purse seiners in the Black Sea region with a length of 20 m or more engaged in fishing activities in the 2017-2018 fishing season were used as samples. These vessels were categorized into three different groups according to their length. The emissions produced by each length group were calculated separately under different conditions for vessels identified as “port”, “operation”, and “navigation”. The total emissions in the Black Sea region and Türkiye were estimated. This study provides emission estimates using operational conditions and real data from Turkish-flagged purse seiners engaged in fishing in the Black Sea. In this respect, this research presents novelty and addresses an important gap in the existing literature. The annual emission amount of purse seine fishing vessels in the Black Sea is 260,000 tons, while the annual emission amount from purse seine vessels throughout Türkiye has been calculated as 440,000 tons. As a result, the effectiveness of the Emission Control Area (ECA)/Sulphur ECA region implementation in reducing emissions from maritime activities has been demonstrated. In addition, this study constitutes a source for the exhaust emission inventory of purse seiners in the Black Sea region.","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The coronavirus epidemic, which emerged in Wuhan at the end of 2019, spread worldwide and caused more than 4 million deaths as of 2021. The cruise industry, whose goal is to maintain customer satisfaction at the highest possible level, like all service industries, has passed a difficult test with serious coronavirus disease-2019 (COVID-19) cases that emerged on various ships. The new rules of the COVID-19 pandemic are reflected in the service processes of the ships that started to sail again after a long-term pause in the sector. The main motivation of this study is to determine whether the factors affecting customers’ perceived service quality have changed during the pandemic period in the cruise industry, which is one of the sectors where service quality should be maintained high. Therefore, this study aims to determine the factors affecting the perceived service quality of cruise passengers and determine the new factors that occurred during the pandemic. To achieve this goal, the online narratives of 418 passengers cruising in the European Region between September 2020 and September 2021 were analyzed using Leximancer software, and key elements of passengers’ perceptions of service quality were determined. As a result of the study, it was found that cabin location, restaurant quality, and COVID-related variables became significant factors affecting the perceived service quality of cruise passengers during the pandemic period. Additionally, disembarkation and embarkation, which were important variables in the pre-COVID period, were reclassified under the COVID category. The study also determined that adherence to COVID-19 measures by cruise companies positively impacted customer satisfaction during this period.
{"title":"Cruise Passengers’ Perceived Service Quality During the Pandemic Period via User-Generated Content","authors":"Batuhan Çullu, Nergis Özispa, Gamze Arabelen","doi":"10.4274/jems.2024.35403","DOIUrl":"https://doi.org/10.4274/jems.2024.35403","url":null,"abstract":"The coronavirus epidemic, which emerged in Wuhan at the end of 2019, spread worldwide and caused more than 4 million deaths as of 2021. The cruise industry, whose goal is to maintain customer satisfaction at the highest possible level, like all service industries, has passed a difficult test with serious coronavirus disease-2019 (COVID-19) cases that emerged on various ships. The new rules of the COVID-19 pandemic are reflected in the service processes of the ships that started to sail again after a long-term pause in the sector. The main motivation of this study is to determine whether the factors affecting customers’ perceived service quality have changed during the pandemic period in the cruise industry, which is one of the sectors where service quality should be maintained high. Therefore, this study aims to determine the factors affecting the perceived service quality of cruise passengers and determine the new factors that occurred during the pandemic. To achieve this goal, the online narratives of 418 passengers cruising in the European Region between September 2020 and September 2021 were analyzed using Leximancer software, and key elements of passengers’ perceptions of service quality were determined. As a result of the study, it was found that cabin location, restaurant quality, and COVID-related variables became significant factors affecting the perceived service quality of cruise passengers during the pandemic period. Additionally, disembarkation and embarkation, which were important variables in the pre-COVID period, were reclassified under the COVID category. The study also determined that adherence to COVID-19 measures by cruise companies positively impacted customer satisfaction during this period.","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Calculation of Time-Independent Maneuvering Coefficients of an Underwater Vehicle Based on Single Grid Structure","authors":"Oguzhan Kirikbas, Şakir Bal","doi":"10.4274/jems.2024.02703","DOIUrl":"https://doi.org/10.4274/jems.2024.02703","url":null,"abstract":"","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141110970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yen Thi Pham, Ngoc Cuong Truong, Phung Hung Nguyen, Hwanseong Kim
{"title":"Decision-Making for Shipping Networks Based on Adaptive Cumulative Prospect Theory: A Case Study in Vietnam","authors":"Yen Thi Pham, Ngoc Cuong Truong, Phung Hung Nguyen, Hwanseong Kim","doi":"10.4274/jems.2024.76993","DOIUrl":"https://doi.org/10.4274/jems.2024.76993","url":null,"abstract":"","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141110905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fire Safety Analysis Onboard Passenger Ships by using Fire Dynamics Simulations: Case Study of a Turkish Domestic Passenger Ship","authors":"Tolga Aycı, Barış Barlas, Aykut Ölçer","doi":"10.4274/jems.2024.56514","DOIUrl":"https://doi.org/10.4274/jems.2024.56514","url":null,"abstract":"","PeriodicalId":41280,"journal":{"name":"Journal of Eta Maritime Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141111334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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