The performance of several point absorber-type wave energy converters is studied by evaluating the annual energy production and the cost of energy in two locations off the Turkish coasts of the Black Sea. The added mass, hydrodynamic damping, and wave forces exerted on the floats are calculated by a 3D Boundary Element Method based on potential flow theory. The responses of the floats are evaluated in the time domain by employing a family of Runge-Kutta Methods with different orders of accuracy and the annual energy generated is calculated by taking the annual occurrence of sea states into account. The cost of energy generated by each wave energy converter is evaluated by calculating the Levelized Cost of Energy. The results show that the WECs with Berkeley Wedge-Shaped floats generate the maximum amount of energy in Sinop and Hopa. The most economical wave energy converters are those with a cone float and with a Berkeley Wedge-Shaped float in Sinop and Hopa, respectively.
{"title":"AN EVALUATION OF WAVE ENERGY GENERATION AND COST OF ENERGY IN THE BLACK SEA","authors":"İlkay Özer Erselcan","doi":"10.56850/jnse.1423490","DOIUrl":"https://doi.org/10.56850/jnse.1423490","url":null,"abstract":"The performance of several point absorber-type wave energy converters is studied by evaluating the annual energy production and the cost of energy in two locations off the Turkish coasts of the Black Sea. The added mass, hydrodynamic damping, and wave forces exerted on the floats are calculated by a 3D Boundary Element Method based on potential flow theory. The responses of the floats are evaluated in the time domain by employing a family of Runge-Kutta Methods with different orders of accuracy and the annual energy generated is calculated by taking the annual occurrence of sea states into account. The cost of energy generated by each wave energy converter is evaluated by calculating the Levelized Cost of Energy. The results show that the WECs with Berkeley Wedge-Shaped floats generate the maximum amount of energy in Sinop and Hopa. The most economical wave energy converters are those with a cone float and with a Berkeley Wedge-Shaped float in Sinop and Hopa, respectively.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"18 s2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140229682","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}
Among various modes of transportation, maritime transportation holds critical importance since it provides substantial carrying capacity with low unit costs. To perform seamless and efficient operations in maritime transportation plays a pivotal role in achieving sustainable development goals and the International Maritime Organization (IMO) targets. The execution of uninterrupted operations can only be carried out with the existence of reliable systems. Creating reliable systems onboard is possible through the implementation of planned and proactive maintenance strategies and leveraging experiences gained from past failures. 10-year failure records of bulk carriers have been scrutinized within the scope of system reliability to determine critical equipment and units. The data has been categorized into subgroups under four fundamental headings, and subsequent reliability analyses have been conducted on each subgroup. Within the subgroups, the reliability of navigation equipment should be improved since it has the highest failure rate and its malfunction can cause very serious marine accidents. This equipment is followed by fire-fighting systems, cargo equipment, and GMDSS instruments which are essential for ship operations based on reliability results. Therefore, regular failure records, planned and proactive maintenance strategies, and also extra efforts should be performed on this equipment to ensure sustainable and seamless operations in the maritime sector.
{"title":"THE RELIABILITY EVALUATION OF THE DECK MACHINERY AND GALLEY EQUIPMENT OF A BULK CARRIER BY UTILIZING THE FAILURE RECORDS","authors":"Alper Seyhan, Murat Bayraktar, O. Yüksel","doi":"10.56850/jnse.1430191","DOIUrl":"https://doi.org/10.56850/jnse.1430191","url":null,"abstract":"Among various modes of transportation, maritime transportation holds critical importance since it provides substantial carrying capacity with low unit costs. To perform seamless and efficient operations in maritime transportation plays a pivotal role in achieving sustainable development goals and the International Maritime Organization (IMO) targets. The execution of uninterrupted operations can only be carried out with the existence of reliable systems. Creating reliable systems onboard is possible through the implementation of planned and proactive maintenance strategies and leveraging experiences gained from past failures. 10-year failure records of bulk carriers have been scrutinized within the scope of system reliability to determine critical equipment and units. The data has been categorized into subgroups under four fundamental headings, and subsequent reliability analyses have been conducted on each subgroup. Within the subgroups, the reliability of navigation equipment should be improved since it has the highest failure rate and its malfunction can cause very serious marine accidents. This equipment is followed by fire-fighting systems, cargo equipment, and GMDSS instruments which are essential for ship operations based on reliability results. Therefore, regular failure records, planned and proactive maintenance strategies, and also extra efforts should be performed on this equipment to ensure sustainable and seamless operations in the maritime sector.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"52 s39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140230010","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 article introduces a steganographic algorithm designed for hiding data in the color images, along with two different algorithm designs derived from this method. The bits of the hidden message are embedded sequentially into each pixel using the bit comparison. The comparison method works by matching the bits of the image and the message. The least significant bits (LSB) of the carrier (cover) image bytes change depending on the number of matching bits between the carrier image and the hidden message. The proposed method has the potential to hide 1 byte of data within 5 bytes under optimal conditions. The designed algorithms have been tested on a series of color images, and satisfactory results have been achieved in terms of embedding a sufficient amount of data into the images without compromising image quality.
{"title":"Development of Novel Comparison Based Steganography Algorithms on Multimedia to Hide Private Data","authors":"Musa Milli, Daniyar Khassenov","doi":"10.56850/jnse.1385482","DOIUrl":"https://doi.org/10.56850/jnse.1385482","url":null,"abstract":"This article introduces a steganographic algorithm designed for hiding data in the color images, along with two different algorithm designs derived from this method. The bits of the hidden message are embedded sequentially into each pixel using the bit comparison. The comparison method works by matching the bits of the image and the message. The least significant bits (LSB) of the carrier (cover) image bytes change depending on the number of matching bits between the carrier image and the hidden message. The proposed method has the potential to hide 1 byte of data within 5 bytes under optimal conditions. The designed algorithms have been tested on a series of color images, and satisfactory results have been achieved in terms of embedding a sufficient amount of data into the images without compromising image quality.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"499 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011196","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}
A test propeller designed as a fixed pitch (FPP) propeller has been made to operate on CPP principles with geometric modifications to the blade and hub geometry. The hydrodynamic performance of this modified propeller compared to its parent FPP propeller is investigated. The study was solved in a computer environment using computational fluid dynamics (CFD) methods. The flow around the propeller is modeled as a three-dimensional, time-dependent, incompressible and turbulent flow. The Realizable k-ε turbulence model is commonly chosen to represent and characterize turbulence in fluid flow. It is seen that the optimum efficiency point in propeller design conditions is J=0.8, the negative pitch angle changes of the blades at the advance coefficients below this point, and the positive pitch angle changes at the advance coefficients above this point, the propeller efficiency values exceed the FPP version propeller efficiency values.
{"title":"NUMERICAL INVESTIGATION OF THE HYDRODYNAMIC PERFORMANCE OF A PROPELLER CONVERTED FROM FPP TO CPP","authors":"Ahmet YURTSEVEN","doi":"10.56850/jnse.1325575","DOIUrl":"https://doi.org/10.56850/jnse.1325575","url":null,"abstract":"A test propeller designed as a fixed pitch (FPP) propeller has been made to operate on CPP principles with geometric modifications to the blade and hub geometry. The hydrodynamic performance of this modified propeller compared to its parent FPP propeller is investigated. The study was solved in a computer environment using computational fluid dynamics (CFD) methods. The flow around the propeller is modeled as a three-dimensional, time-dependent, incompressible and turbulent flow. The Realizable k-ε turbulence model is commonly chosen to represent and characterize turbulence in fluid flow. It is seen that the optimum efficiency point in propeller design conditions is J=0.8, the negative pitch angle changes of the blades at the advance coefficients below this point, and the positive pitch angle changes at the advance coefficients above this point, the propeller efficiency values exceed the FPP version propeller efficiency values.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135204177","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}
Welcome to the first issue for the year 2023, a significant milestone for us as we celebrate the centennial of the Republic of Türkiye, the quarter-millennial anniversary of the Turkish Naval Academy (TNA), and the vicennial celebration of the Journal of Naval Sciences and Engineering (JNSE). These historical connections symbolize the remarkable progress achieved by our country, academy, and journal. In this issue, we are delighted to present five research papers that contribute to the advancement of naval sciences and engineering. These papers cover a wide range of topics, including the production of translucent alumina ceramics by tape casting, spectroscopic investigation of argon glow discharge in a plasma medium, thermal analysis of XLPE insulated submarine cables for different loading conditions, scale effects on the linear hydrodynamic coefficients of DARPA SUBOFF, and numerical investigation of HVAC systems in a naval ship compartment. We would also like to remind you that starting from September 1, 2022, we have been providing Digital Object Identifiers (DOIs) for accepted papers, ensuring their persistent identification. Additionally, we have implemented a new publishing process where papers are made available online before the printed hardcopy format, allowing for broader accessibility and faster dissemination of research findings. Our November 2023 issue is dedicated to highlighting cutting-edge advancements and research in naval technology and engineering. We have published a call for papers online, encouraging submissions on various topics, including 3D modeling, digital twin technology, IoT applications, 3D printing, virtual and augmented reality, high-performance computing, automation with robots, drones, and autonomous vehicles, shipyard construction and maintenance cost analysis, lean production methodologies, corrosion protection, wearable technologies for personnel monitoring, and big data analytics in preventive maintenance. We eagerly invite researchers and scholars to submit their work, contributing to this issue. The submitted papers in these areas will be given special attention alongside the journal's regular coverage, offering a comprehensive exploration of the latest advancements in naval sciences and engineering. We would like to extend our heartfelt gratitude to the authors for their valuable contributions to this issue, as well as our dedicated editorial and advisory board members for their expertise and guidance. We are also immensely grateful to the diligent reviewers who have generously contributed their time and expertise to ensure the quality and rigor of the papers published in this issue. Your insightful feedback and constructive criticism have played a vital role in shaping the content of this journal. Additionally, we would like to express our appreciation to our readers for their continued support and trust in JNSE. Thank you all for your invaluable contributions. Fatih ERDEN, Ph.D. Edito
{"title":"FOREWORD FROM THE EDITOR-IN-CHIEF","authors":"F. Erden","doi":"10.56850/jnse.3052023","DOIUrl":"https://doi.org/10.56850/jnse.3052023","url":null,"abstract":"Welcome to the first issue for the year 2023, a significant milestone for us as we celebrate the centennial of the Republic of Türkiye, the quarter-millennial anniversary of the Turkish Naval Academy (TNA), and the vicennial celebration of the Journal of Naval Sciences and Engineering (JNSE). These historical connections symbolize the remarkable progress achieved by our country, academy, and journal. \u0000 \u0000In this issue, we are delighted to present five research papers that contribute to the advancement of naval sciences and engineering. These papers cover a wide range of topics, including the production of translucent alumina ceramics by tape casting, spectroscopic investigation of argon glow discharge in a plasma medium, thermal analysis of XLPE insulated submarine cables for different loading conditions, scale effects on the linear hydrodynamic coefficients of DARPA SUBOFF, and numerical investigation of HVAC systems in a naval ship compartment. \u0000 \u0000We would also like to remind you that starting from September 1, 2022, we have been providing Digital Object Identifiers (DOIs) for accepted papers, ensuring their persistent identification. Additionally, we have implemented a new publishing process where papers are made available online before the printed hardcopy format, allowing for broader accessibility and faster dissemination of research findings. \u0000 \u0000Our November 2023 issue is dedicated to highlighting cutting-edge advancements and research in naval technology and engineering. We have published a call for papers online, encouraging submissions on various topics, including 3D modeling, digital twin technology, IoT applications, 3D printing, virtual and augmented reality, high-performance computing, automation with robots, drones, and autonomous vehicles, shipyard construction and maintenance cost analysis, lean production methodologies, corrosion protection, wearable technologies for personnel monitoring, and big data analytics in preventive maintenance. We eagerly invite researchers and scholars to submit their work, contributing to this issue. The submitted papers in these areas will be given special attention alongside the journal's regular coverage, offering a comprehensive exploration of the latest advancements in naval sciences and engineering. \u0000 \u0000We would like to extend our heartfelt gratitude to the authors for their valuable contributions to this issue, as well as our dedicated editorial and advisory board members for their expertise and guidance. We are also immensely grateful to the diligent reviewers who have generously contributed their time and expertise to ensure the quality and rigor of the papers published in this issue. Your insightful feedback and constructive criticism have played a vital role in shaping the content of this journal. \u0000 \u0000Additionally, we would like to express our appreciation to our readers for their continued support and trust in JNSE. Thank you all for your invaluable contributions. \u0000 \u0000Fatih ERDEN, Ph.D. \u0000Edito","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124411693","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}
Alpay Acar, Murat Uryan, Ali Doğrul, Asım Sinan Karakurt, Doç. Dr. Cenk Çeli̇k
HVAC system design and optimization of the ventilation and air-conditioning of indoor environments are crucial for human comfort. Especially in recent years, due to the Covid pandemic, the importance of this hot topic is noticed. This study aims to focus on the HVAC performance of a dorm compartment onboard a naval surface ship since the ship environment is a good example of indoor air ventilation problem. The HVAC performance was investigated using a RANS solver. The numerical analyses were conducted for different scenarios and the results were finally discussed in terms of HVAC system location, air temperature, air intake and outlet conditions. As a conclusion, the current HVAC system design was found insufficient and alternative solutions were proposed in order to improve indoor air quality and thermal comfort.
{"title":"BİR SAVAŞ GEMİSİ KOMPARTIMANINDA HVAC SİSTEMLERİNİN SAYISAL İNCELENMESİ: DOĞAL HAVALANDIRMA VE İKLİMLENDİRME","authors":"Alpay Acar, Murat Uryan, Ali Doğrul, Asım Sinan Karakurt, Doç. Dr. Cenk Çeli̇k","doi":"10.56850/jnse.1274350","DOIUrl":"https://doi.org/10.56850/jnse.1274350","url":null,"abstract":"HVAC system design and optimization of the ventilation and air-conditioning of indoor environments are crucial for human comfort. Especially in recent years, due to the Covid pandemic, the importance of this hot topic is noticed. This study aims to focus on the HVAC performance of a dorm compartment onboard a naval surface ship since the ship environment is a good example of indoor air ventilation problem. The HVAC performance was investigated using a RANS solver. The numerical analyses were conducted for different scenarios and the results were finally discussed in terms of HVAC system location, air temperature, air intake and outlet conditions. As a conclusion, the current HVAC system design was found insufficient and alternative solutions were proposed in order to improve indoor air quality and thermal comfort.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121449656","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}
Submarine cables are critical assets that play an indispensable role in interconnected power systems, particularly in cross-sea energy transmission and offshore wind turbines. Their importance is further accentuated in exigent situations such as natural disasters and war, which emphasize the need for secure, reliable and uninterrupted energy supply. Furthermore, the investment and operating costs of submarine cables are relatively higher than other power system equipment, making it essential to operate them under the rated operating conditions to prevent possible faults and ensure power system stability. As thermal stress can lead to damage of cable insulation, it is an essential parameter to consider. Overloading increases thermal stress, resulting in rapid aging of the cable insulation and a shorter cable lifetime. Therefore, it is imperative to determine the maximum conductor temperatures and current carrying capacities of submarine cables under varying loading rates and ambient conditions using thermal analysis. In this study, thermal analyses are carried out for a three-phase, 220 kV HVAC, XLPE insulated submarine cable under different loading conditions. The findings demonstrate that the maximum temperature, current carrying capacity, and total losses of the cable are significantly impacted by loading rate, phase imbalance, and seawater temperature.
{"title":"THERMAL ANALYSIS OF XLPE INSULATED SUBMARINE CABLES FOR DIFFERENT LOADING CONDITIONS","authors":"A. Arabul, C. F. Kumru","doi":"10.56850/jnse.1252303","DOIUrl":"https://doi.org/10.56850/jnse.1252303","url":null,"abstract":"Submarine cables are critical assets that play an indispensable role in interconnected power systems, particularly in cross-sea energy transmission and offshore wind turbines. Their importance is further accentuated in exigent situations such as natural disasters and war, which emphasize the need for secure, reliable and uninterrupted energy supply. Furthermore, the investment and operating costs of submarine cables are relatively higher than other power system equipment, making it essential to operate them under the rated operating conditions to prevent possible faults and ensure power system stability. As thermal stress can lead to damage of cable insulation, it is an essential parameter to consider. Overloading increases thermal stress, resulting in rapid aging of the cable insulation and a shorter cable lifetime. Therefore, it is imperative to determine the maximum conductor temperatures and current carrying capacities of submarine cables under varying loading rates and ambient conditions using thermal analysis. In this study, thermal analyses are carried out for a three-phase, 220 kV HVAC, XLPE insulated submarine cable under different loading conditions. The findings demonstrate that the maximum temperature, current carrying capacity, and total losses of the cable are significantly impacted by loading rate, phase imbalance, and seawater temperature.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130711908","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}
As well known, forces and moments acting on a ship are functions of Froude and Reynolds numbers. As a ship gets larger in size, these two numbers grow, which leads to different flow regimes around the hull. However, the state-of-the-art in maneuvering calculations is to consider the hydrodynamic coefficients as constants for model and full ship scales. For submerged bodies, the Froude number is insignificant due to the distant free water surface; therefore, these forces only depend on the Reynolds number. In this study, we consider the benchmark ‘DARPA’ Suboff form, which is extensively studied in the literature, and investigated the scale effects on the hydrodynamic coefficients with respect to the Reynolds number. Numerical studies are carried out on the bare hull form of the submarine. Captive motions of static drift and pure yaw motions are conducted utilizing the oblique towing and rotating arm tests via RANS-based CFD. Linear hydrodynamic coefficients are expressed with logarithmic equations as functions of the Reynolds number, explicitly showing the dependency on the ship’s model scale.
{"title":"SCALE EFFECT ON THE LINEAR HYDRODYNAMIC COEFFICIENTS OF DARPA SUBOFF","authors":"Furkan Kiyçak, Ö. Kinaci","doi":"10.56850/jnse.1250094","DOIUrl":"https://doi.org/10.56850/jnse.1250094","url":null,"abstract":"As well known, forces and moments acting on a ship are functions of Froude and Reynolds numbers. As a ship gets larger in size, these two numbers grow, which leads to different flow regimes around the hull. However, the state-of-the-art in maneuvering calculations is to consider the hydrodynamic coefficients as constants for model and full ship scales. For submerged bodies, the Froude number is insignificant due to the distant free water surface; therefore, these forces only depend on the Reynolds number. In this study, we consider the benchmark ‘DARPA’ Suboff form, which is extensively studied in the literature, and investigated the scale effects on the hydrodynamic coefficients with respect to the Reynolds number. Numerical studies are carried out on the bare hull form of the submarine. Captive motions of static drift and pure yaw motions are conducted utilizing the oblique towing and rotating arm tests via RANS-based CFD. Linear hydrodynamic coefficients are expressed with logarithmic equations as functions of the Reynolds number, explicitly showing the dependency on the ship’s model scale.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130863712","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}
In this study, UV-VIS-NIR (Ultraviolet Visible Near-Infrared) spectra emitted from Argon Glow discharge plasma in a low vacuum were recorded with a high-resolution Czerny-Turner type spectrometer. Argon plasma was produced at a pressure of 5mTorr and with a voltage of 584 V. Argon plasma was produced between two parallel stainless steel plates anode and cathode with a diameter of 15 cm, a thickness of 0.8 cm, and a distance of 13 cm between them. The radiative and collisional processes of the Argon plasma medium were modeled by the PrismSPECT atomic physics software (Software). The distributions of ion densities were calculated using the Saha-Boltzmann equation. The intensity of the excited energy levels of Ar(I) and Ar (II) ions were calculated in the electron temperature range of (0.4-3.5eV) and the mass density of (10-4-10-1gr/cm3). The UV-Visible-NIR spectra were simulated and compared with experimental spectra. The ratios of the intensities of the ArII/ArI (1s22s22p63s23p44f1/1s22s22p63s23p54p1) spectral lines were obtained for different plasma temperatures and densities. The temperature of the argon plasma was obtained from the spectral line intensity ratios.
{"title":"Spectroscopic Investigation of Argon DC Glow Discharge in Plasma Medium","authors":"Esra Okumuş","doi":"10.56850/jnse.1179169","DOIUrl":"https://doi.org/10.56850/jnse.1179169","url":null,"abstract":"In this study, UV-VIS-NIR (Ultraviolet Visible Near-Infrared) spectra emitted from Argon Glow discharge plasma in a low vacuum were recorded with a high-resolution Czerny-Turner type spectrometer. Argon plasma was produced at a pressure of 5mTorr and with a voltage of 584 V. Argon plasma was produced between two parallel stainless steel plates anode and cathode with a diameter of 15 cm, a thickness of 0.8 cm, and a distance of 13 cm between them. The radiative and collisional processes of the Argon plasma medium were modeled by the PrismSPECT atomic physics software (Software). The distributions of ion densities were calculated using the Saha-Boltzmann equation. The intensity of the excited energy levels of Ar(I) and Ar (II) ions were calculated in the electron temperature range of (0.4-3.5eV) and the mass density of (10-4-10-1gr/cm3). The UV-Visible-NIR spectra were simulated and compared with experimental spectra. The ratios of the intensities of the ArII/ArI (1s22s22p63s23p44f1/1s22s22p63s23p54p1) spectral lines were obtained for different plasma temperatures and densities. The temperature of the argon plasma was obtained from the spectral line intensity ratios.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116729560","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}
Professor Oleg A. Tretyakov is recognized in the field of radiophysics as the founder of the Evolutionary Approach to Electromagnetics (EAE). His analytical time domain approach which was acknowledged as an alternative to the method of complex amplitudes successfully applied to cavity and waveguide problems. In his final years, he proposed a novel format of Maxwell’s equations in SI units where electric and magnetic field strength vectors have a common physical dimension of inverse meter. In this article, we pay special tribute to his exceptional career and contributions to science and extend his last work to derive a novel format of the wave equation in SI units.
Oleg A. Tretyakov教授是放射物理学领域公认的电磁学进化方法(EAE)的创始人。他的时域分析方法被认为是复振幅法的另一种选择，成功地应用于腔和波导问题。在他生命的最后几年，他提出了一种新的单位制麦克斯韦方程组格式，其中电场和磁场强度向量具有一个共同的逆米物理维度。在这篇文章中，我们特别赞扬他杰出的职业生涯和对科学的贡献，并扩展他最后的工作，推导出一种新的SI单位波动方程格式。
{"title":"AN EXTENSION OF THE LAST WORK OF OLEG A. TRETYAKOV: A NOVEL FORMAT OF THE WAVE EQUATION IN SI UNITS","authors":"F. Erden, Ahmet A. Cosan","doi":"10.56850/jnse.1181938","DOIUrl":"https://doi.org/10.56850/jnse.1181938","url":null,"abstract":"Professor Oleg A. Tretyakov is recognized in the field of radiophysics as the founder of the Evolutionary Approach to Electromagnetics (EAE). His analytical time domain approach which was acknowledged as an alternative to the method of complex amplitudes successfully applied to cavity and waveguide problems. In his final years, he proposed a novel format of Maxwell’s equations in SI units where electric and magnetic field strength vectors have a common physical dimension of inverse meter. In this article, we pay special tribute to his exceptional career and contributions to science and extend his last work to derive a novel format of the wave equation in SI units.","PeriodicalId":413796,"journal":{"name":"Journal of Naval Sciences and Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115087941","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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