Items

  • THERMAL BALANCE ANALYSIS OF THE MAN B&W 6S50ME-C MARINE DIESEL ENGINE

    Andrei Răzvan TUDOR; Bogdan Mihai VÂRLAN
    DOI:10.53464/JMTE.01.2026.10
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This study investigates the thermal balance of a MAN B&W 6S50ME-C two-stroke marine engine operating as the main propulsion system of a 40,000 DWT Oil/Chemical Tanker. Within the current maritime context, where fuel efficiency and emission reduction have become major priorities, a clear understanding of how thermal energy is distributed inside large marine engines is essential for performance optimization and energy recovery solutions. The objective of the paper is to determine how the energy released during fuel combustion is converted into useful mechanical work and how it is dissipated through various loss mechanisms. The analysis is based on a detailed thermal balance calculation using real operational data, such as effective engine power, specific fuel consumption, cooling fluid flow rates, lubrication oil parameters, and exhaust gas temperatures. The applied methodology consists of thermal balance calculations based on established thermodynamic relations, expressed in absolute, relative and percentage terms. The results indicate that approximately 40.98% of total thermal energy supplied by the fuel is transformed into effective mechanical output. A significant part of the remaining energy is lost through exhaust gases, accounting for about 29.37%, while cooling systems represent approximately 22.32% of total losses. Additional minor losses, including radiation and mechanical friction represent around 7.04%.The analysis confirms that exhaust gas losses constitute the dominant source of recoverable thermal energy. Consequently, the study highlights the importance of exhaust heat recovery systems as an effective means to improve overall engine efficiency, reduce fuel consumption, and support more sustainable marine propulsion operations.
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  • DETERMINATION OF OPTIMAL OPERATING MODES OF MARINE DIESEL ENGINES EXHAUST GAS BYPASS SYSTEMS

    Anton SAMUSENKO; Yurii ZABLOTSKYI; Sergii SAGYN
    DOI:10.53464/JMTE.01.2026.09
    No citations
    A method for determining the optimal operating modes of marine diesel exhaust gas bypass systems is considered. The aim of this research was to determine the optimal volume of exhaust gas bypass for a marine medium-speed diesel engine, specifically the 6L20 Wartsila. Electronic engine control allows flexible adjustment of exhaust gas bypass process within a range of 0 to 10 % of the total volume of gases exiting the diesel cylinder. The use of exhaust gas bypass contributes to improving the environmental performance of marine medium-speed diesel engines, particularly in the operational load range of 55–85 %, where NOx emissions in exhaust gases decrease by 3.5–15.4 %. The greatest reduction in NOx emissions occurs at loads of 75–85 %. The use of the exhaust gas bypass system is deemed effective for loads exceeding 75 %, with potential reductions in nitrogen oxide emissions ranging from 9.2 % to 15.4 %. For loads of 55–65 %, a reduction in nitrogen oxide emissions (3.3–5.6 %) is also observed, but with a simultaneous increase in specific fuel oil consumption (4.2–4.4 %). However, for certain bypass values, the diesel engine's thermal stress exceeds acceptable limits.
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  • ANALYSIS OF SPECIFIC FUEL CONSUMPTION BY SHIP INERT GAS GENERATOR: NITROGEN VS COMBUSTION-TYPE

    Kostiantyn RUDYK; Olga KHLIYEVA
    DOI:10.53464/JMTE.01.2026.08
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper compares two methods of generating inert gas on ships. The advantages and disadvantages of two inert gas generators are considered: membrane nitrogen generator and combustion-type generator. Based on the analysis of electricity and fuel consumption of both systems, it was shown that the membrane nitrogen generator outperforms the combustion-type inert gas generator. Specific fuel consumption for a nitrogen generator (at 5 % of oxygen on inert gas) is more than two times less compared with a combustion-type one: 34.8 kg/nm3 vs 78.5 kg/nm3. However, when the required oxygen content in the inert gas decreases, the membrane nitrogen generator will be inherent in higher electricity consumption, requiring further analysis of its feasibility compared to the combustiontype one.
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  • A REVIEW OF INNOVATIVE WIND TURBINES AND PHOTOVOLTAIC ARCHITECTURES

    Ciprian POPA; Andrei-Darius DELIU
    DOI:10.53464/JMTE.01.2026.07
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This study is framed by the accelerating displacement of fossil energy carriers, driven by depletion and externalities (GHG emissions and ecosystem impacts), and by the global shift toward converter-interfaced variable renewable energy (VRE). The objective is to justify, using recent deployment evidence, why next-generation photovoltaic (PV) and wind energy conversion system (WECS) technologies constitute the highest-leverage innovation targets for near-term capacity scale-up and grid-compatible decarbonization. Methodologically, the work combines (i) macro-trend interrogation of IRENA renewable capacity statistics (2015–2024) with (ii) a structured technology review of emerging wind concepts (vortex-induced vibration bladeless harvesters, passive/ducted building-integrated turbines, and modular multi-rotor architectures) and advanced PV architectures (bifacial modules and transparent PV/TLSC devices), focusing on dominant physical mechanisms, conversion chains, and deployment constraints. Results show that 2024 delivered a record +585 GW (+15.1%) renewable capacity expansion, with PV (+452 GW; +32.2%) and wind (+113 GW; +11.1%) contributing 96.6% of net additions, whereas hydro, bioenergy, and geothermal exhibited marginal growth. Key technology bottlenecks are identified: resonance-bandwidth limits in VIV harvesters (addressable via adaptive stiffness tuning), aerodynamic losses and siting dependence in passive systems, and load/wake management in multi-rotor arrays; bifacial PV bankability remains coupled to rear-irradiance modelling and mismatch control, while TPV is constrained by the transparency-efficiency trade-off. The findings indicate that accelerating PV/WECS innovation is pivotal for sustained renewable expansion under realistic environmental variability.
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  • THE IMPLICATIONS OF NEUROMARKETING IN CONTEMPORARY MARKETING TECHNIQUES AND CONSUMER BEHAVIOUR

    Vanesa PETRAȘCU; Elena CARP
    DOI:10.53464/JMTE.01.2026.06
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Neuromarketing is an emerging interdisciplinary field that combines neuroscience with marketing research to uncover insights into consumer behavior at the neural level. This article offers an academic examination of how neuromarketing techniques are applied in modern marketing practices and analyzes their implications for consumer decision-making. The study outlines the theoretical foundations of neuromarketing, including its methods for investigating consumers’ subconscious responses. Key findings indicate that neuromarketing has significantly influenced areas such as advertising design, branding strategies, pricing tactics, and product development by revealing unspoken preferences and emotional reactions from consumers.
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  • ENERGY-EXERGY ANALYSIS VERSUS ENERGY, EXERGY AND THERMOECONOMIC ANALYSIS – A CASE OF STUDY

    Feiza MEMET
    DOI:10.53464/JMTE.01.2026.05
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    On board of ships, cascade refrigeration systems are used when both frozen and refrigerated products are transported. In such a situation, two different levels of temperature are ensured in the same time. There are needed two conventional refrigeration systems which are coupled by a cascade heat exchanger. Thermodynamic analysis of these systems are important when aiming efficient design and performance optimization. The main objective of this paper is to present different analysis means such as energy, exergy or thermoeconomic (exergoeconomic). Also, there are analysed the challenges to be faced by engineers when developing a thermoeconomic analysis of cascade vapour compression refrigeration systems. Thermoeconomics analysis is a “sensitive issue” due to the interdisciplinary approach, being combined concepts of economics and thermodynamics to evaluate cost formation process of these thermal systems.
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  • EFFECT OF CAVITATION EROSION OVER A NI-AL-BRONZE PROPELLER

    George Ciprian IATAN; Adrian LUNGU
    DOI:10.53464/JMTE.01.2026.04
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Commercial vessels with large deadweight capacity engaged in international voyages are generally powered by a single propeller. Hence, because the responsibility for developing the thrust force lays upon a single thrust component and redundancy cannot be ensured, a comprehensive evaluation for the operational conditions is to be carried out, as the propeller is closely related with the hydrodynamic seaworthiness of the vessel, which should precede any propulsion analysis, [1-2]. Despite the proven reliability of the nickel–aluminium-bronze alloy (NAB hereafter) used in its manufacturing, a marine propellers exposed to the risk of extended cavitation, the propeller is prone to localised wear and surface degradation. This is the reason of the present research aimed at is addressing the problematics of cavitation erosion of NAB propellers by employment of CFD investigation instruments. Cavitation occurrence is emphasised on a simplified three blades propeller together with hydrodynamic characteristics evaluation. Hence, the initiation of the cavitation on the blades surfaces is described together with a brief introduction of the most commonly used mitigation and recondition techniques of cavitation affected areas of propeller blades through modern methodologies.
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  • GREENING THE OPERATION OF THE ARLEIGH BURKE-CLASS (DDG-51) VESSEL UNDER CLIMATE CHANGE SCENARIOS: A COST AND EMISSIONS PERSPECTIVE

    A. DESHPANDE
    DOI:10.53464/JMTE.01.2026.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Since its inception in 1991, the DDG-51 naval class vessel continues to be a workhorse for the US Navy. In the coming three decades, naval performance is expected to be influenced by climate change. We would like to investigate whether the current marine diesel run vessel will benefit from retrofitting any other technology to tackle climate change impact and contribute to a greener operation. We argue that substituting diesel with methane gas while retrofitting with air lubrication can indeed lend help to this effort. More technically, drawing inspiration from maritime logistics, we arrive at our conclusion that the conventional diesel run DDG-51 naval vessel with air lubrication will offer similar CO2 per ton nautical mile emissions and related costs per ton nautical mile like the environmentally better methane gas fuel run without air lubrication. We thus conclude that the methane gas run vessel with air lubrication is better than diesel run vessel with air lubrication. This conclusion is shown to be valid via a climate scenario projection for three decades into the future.
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  • SIMPLIFIED MODELING AND SIMULATION OF RUDDER CONTROL FOR PARAMETRIC ROLLING REDUCTION IN SHIPS

    Dumitru DELEANU
    DOI:10.53464/JMTE.01.2026.02
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Parametric rolling is a resonance phenomenon affecting the safety and operational performance of ships, especially in head or following seas. This paper investigates the possibility of attenuation of parametric roll oscillations by using rudder-based stabilization. To this goal, the ship is represented as a single-degree of freedom oscillator with nonlinear damping and time-varying nonlinear stiffness, subjected to a proportional-derivative (PD) control applied via the rudder. Numerical simulations are performed to measure the influence of the main model parameters, including control gains, initial conditions, encounter wave frequency, on the ship response in roll. Results demonstrate that PD rudder control are able to reduce substantially roll amplitudes for an extensive range of operating conditions. The findings provide insight into the effectiveness of rudder-based control of ship rolling and can be used as a foundation for future research using more complex ship models. Key words: parametric roll, rudder-based control.
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  • 18 YEARS OF STORIES FOR JOURNAL OF MARINE TECHNOLOGY AND ENVIRONMENT – MORE MATURE, MORE DEDICATED

    Mariana PANAITESCU; Fanel-Viorel PANAITESCU
    DOI:10.53464/JMTE.01.2026.01
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Journal of Marine Technology JMTE has come of age. This year, it’s celebrating its 18th birthday! His journal has ISSN (Print): 1844-6116 ISSN (Online): 2501-8795 (from Volume 2/2016 to present). Number of articles published over the years: 2008, issue 1-14 articles; 2009-issue 1,15 articles; issue 2, 19 articles; 2010-issue 1,33 articles; issue 2-23 articles; 2011-issue 1,issue 2,17; 2012-issue 1,20; issue 2,13; 2013-issue 1,20; issue 2,16; 2014-issue 1,11; issue 2,13; 2015-issue 1,13; issue 2,13;l 2016-issue 1,11; issue 2,12; 2017-issue 1,11; issue 2,17; 2018-issue1,9; issue 2,6; 2020-issue 1,6; issue 2,8; 2021-issue 1,7; issue 2-11; 2022-issue 1, 12; issue 2, 10; 2023-issue 1,10; issue 2,14; 2024-issue 1,11; issue 2,9; 2025-issue 1,11; issue 2,9; 2025-issue 1,12; issue 2,11. From 2008 to 2015, the editor-inchief was Associate Professor Feiza Memet, Ph.D., Eng., and from 2016 to the present, it has been Professor Mariana Panaitescu, Ph.D., Eng. Initially, the journal published a short abstract. Later, the full-length articles were published. Between 2013 and 2015, the journal was indexed in Copernicus (ICV 2013: 5.69; ICV 2015: 72.06). The Editorial team is currently working to index the journal in other internationally recognized databases. As of 2026, the journal is open access (Creative Commons Attribution 4.0 International License).
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  • GASIFICATION OF AGRICULTURAL RESIDUAL BIOMASS AND ORGANIC WASTE FROM THE FOOD INDUSTRY

    Lucian-Georgel UNGUREANU; Ana-Bianca MITITELU
    10/1/2025
    DOI:10.53464/JMTE.02.2025.11
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Biogas is an increasingly important renewable energy resource in a world facing environmental challenges and the urgent need for sustainable solutions. Produced through the anaerobic decomposition of organic materials, biogas offers an efficient means of valorising organic waste. The production process yields a gas mixture, primarily methane and carbon dioxide, that can be converted into electricity, heat, or fuel, thereby contributing to the reduction of greenhouse gas emissions. Moreover, it supports a sustainable resource cycle, making this technology a highly promising solution for the future of green energy. This study presents a comparative analysis of the operational performance of the Moara-Suceava biogas plant when using agricultural residual biomass (corn and animal waste) versus organic waste from the food industry. The results indicate that, although larger quantities of raw material are required to produce the same volumetric amount of biogas from food industry waste, the latter yields higher lower heating values (5.81–6.20 kWh/Nm³) compared to agricultural residual biomass (4.50–4.91 kWh/Nm³).
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  • OVERVIEW STUDY ON GREENHOUSE GAS EMISSIONS IN ROMANIA

    Mirela-Iuliana ŞUNDRI; Feiza MEMET
    10/1/2025
    DOI:10.53464/JMTE.02.2025.10
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This study provides an overview of greenhouse gas (GHG) emissions in Romania between 1970 and 2023, highlighting long-term trends, sectoral contributions, and their implications for climate policy. Using data from the Emissions Database for Global Atmospheric Research (EDGAR), annual values of CO₂, CH₄, N₂O, and F-gases were analysed across eight major anthropogenic sectors. Results show that Romania experienced a peak of approximately 280 MtCO₂eq in 1988, followed by a sharp decline after the political and economic transition in 1989. By 2023, emissions decreased to around 105 MtCO₂eq, representing a 62% reduction. This decline was largely driven by the restructuring of heavy industry, closure of inefficient energy facilities, and adoption of EU-aligned environmental policies. However, transport, agriculture, and waste sectors gained increasing relevance as industrial and power-related emissions fell. Despite progress, sustained challenges remain for achieving Romania’s climate neutrality targets by 2050, particularly in transport decarbonization, agricultural emissions control, and methane capture from waste management.
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  • DESIGN AND VALIDATION OF A LOW-COST SONAR PROTOTYPE FOR SYNTHETIC DATASET GENERATION IN UNDERWATER MINE DETECTION

    Singh OJASWIT; Talwar RITVIK
    10/1/2025
    DOI:10.53464/JMTE.02.2025.09
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Detection of underwater mines is very important for military, maritime security, and environment safety applications. However, the development of machine learning models is limited heavily because of the lack of quality labeled sonar datasets, especially in military contexts as the data there is highly confidential and expensive. The problem with current synthetic datasets is that they fail to properly replicate how complex operational underwater environments are which leads to major performance gaps when deployed in the real world. This work shows the design and validation of a low-cost sonar prototype, specifically developed for synthetic dataset generation to work on the issue of the scarcity of data in applications of mine detection underwater. The sonar prototype was built using an Arduino Uno microcontroller, Texas Instruments TUSS4470 ultrasonic analog front end along with a 200khz waterproof transducer in a controlled water tank environment. For echo analysis the system generates 16 cycle bursts and captures approximately 850 samples at 13 μs intervals. The signal processing consists of zero-phase low-pass Butterworth filtering, short-time energy analysis, and adaptive thresholding which is for echo detection. Under varying conditions (like, salinity 0-35 ppt and temperature 10-30°C), the sonar prototype operated successfully and was able to produce high fidelity acoustic datasets. These datasets are suitable for training machine learning models. The sonar prototype provides a proper platform for the generation of acoustic datasets that are realistic under varying environmental conditions and offers a lot of potential for improving the training of machine learning models and generalization in applications of detecting underwater mines.
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  • A CASE OF STUDY ON YOUTH INTEREST IN ENVIRONMENTAL ENIGINEER PROFESSION WHICH IS IN THE HEART OF RENEWABLES

    Feiza MEMET; Iuliana SUNDRI
    10/1/2025
    DOI:10.53464/JMTE.02.2025.08
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Environmental engineering programs are extremely important having in view the projected job growth and the increase in global demand for solutions to face environmental challenges. Universities all over the world respond to this need by providing specialized environmental engineering degrees. It is also the case of Constanta Maritime University which is coming to reply to this request by developing the Engineering and Environmental Protection in Industry program. This is a result of the fact that there is a strong need that each of us should be informed about the environment situation, through out environmental awareness. This concept leads to public health and well being of the environment. On the other hand, we assist to population growth- process direct linked to higher energy demand. In this context, the use of renewable energy sources is of great importance since their impact on the environment is considerable less then traditional ones. This paper exposes a planned and carried out activity by Constanta Maritime University and its 4 partners- high schools with energy profile in the country. The activity called “I choose to become a specialist in renewables” is, in fact, a competition aiming to rank essays reflecting the vision of high school students regarding this profession, to analyze a survey conducted to assess the level of environment awareness of the young participants and to facilitate a discussion between the respondents and teachers specialized in the field. The findings are encouraging: the scientific board of the competition found motivating ideas in the presented essays and the survey revealed that the students coming from high schools with such a profile shows maturity and understanding of current environmental issues.
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  • PROSPECTS FOR THE USE OF R290 REFRIGERANT IN MARINE REFRIGERATION EQUIPMENT

    Matvii MALTSEV; Olga KHLIYEVA
    10/1/2025
    DOI:10.53464/JMTE.02.2025
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The need to replace traditional refrigerants in marine refrigeration equipment with low-GWP alternatives is growing due to international climate regulations. This paper discusses the current status and potential of R290 (propane) as a long-term substitute in marine air conditioning systems. Compared to other refrigerants, R290 offers higher energy efficiency, low environmental impact, and compatibility with existing system designs. Challenges related to flammability are addressed through compliance with safety standards and technical solutions approved by major classification societies. Calculations of performance parameters under different climatic conditions support the feasibility of switching to R290 as a sustainable alternative.
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  • HOW TO ADDRESS THE CHALLENGES IN THE BLACK SEA REGION IN THE CONTEXT OF THE DEVELOPMENT OF THE BLUE ECONOMY

    Marusya LYUBCHEVA; Milen DIMITROV; Mihaela BĂRHALESCU
    10/1/2025
    DOI:10.53464/JMTE.02.2025 .06
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The publication examines the challenges facing the countries of the Black Sea region and the key role of human resources in the development of the blue economy, analyses how they can be effectively adapted to the new realities related to technologies, skills and policies. The data are based on our own researches, the reports and discussions of the annual National Round Table "The Sea - Border or Door". They show how the challenges can be addressed in order to improve cooperation processes, ensure citizen participation in management processes, increase knowledge about marine resources and accelerate the process of blue growth in the region.
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  • APPLICATION OF RKFMEA, FOR ASSESSING THE RISK AND SUSTAINABILITY IN THE BLACK SEA BASIN

    Vladimir KANEV; Sabina NEDKOVA; Plamena ATANASOVA
    10/1/2025
    DOI:10.53464/JMTE.02.2025.05
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The Black Sea basin is a territory that is distributed between countries with different status and level of economic and social development, in which various historical, cultural and social transformations have been and continue to be realized, in which challenges and risks of a different nature are encountered. Nowadays the territory around the Black Sea is identified as the "Black Sea Region". That is the reason for which it is important to create models through which various risks are managed - economic, social, natural, technological. The research is aimed at preventing natural and technological risks in coastal zones and the water area, as a prerequisite for sustainable development, associated with the ever-complicating technical and technological processes. The development proposes the use of specialized software for risk assessment and analysis and prevention management, the application of which creates a prospect for safer socio-economic development and sustainable growth and the assets we assess and seek to improve.
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  • ENERGY EFFICIENCY STRATEGIES FOR OFFSHORE VESSELS WITH DYNAMIC POSITIONING SYSTEMS

    Cătălin-Alexandru GHEORGHE; Nicoleta ACOMI
    10/1/2025
    DOI:10.53464/JMTE.02.2025.04
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The maritime and offshore sectors are under increasing pressure to reduce greenhouse gas (GHG) emissions in line with European Union regulations. Starting from January 2025, the revised EU Monitoring, Reporting, and Verification (MRV) framework extends its scope to offshore vessels above 400 Gross Tonnage. In this context, energy efficiency has come increasingly into focus of operational team of offshore vessels equipped with Dynamic Positioning (DP) systems. Aiming to identify the strategies to optimise fuel consumption and to improve energy efficiency in DP operations, the authors adopted a simulation-based approach using Kongsberg K-POS simulator. This research study analyses the performance of a DP-equipped vessel under varying environmental conditions, system settings, and operational modes. The results highlight several practical pathways for reducing energy consumption: lower gain, the use of green mode, and the optimisation of vessel heading relative to external forces. The conclusions confirm that strategic adjustments to DP system parameters and vessel orientation can yield meaningful reductions in fuel consumption and emissions, thereby lowering operational costs and supporting compliance with EU MRV requirements. This research demonstrates the utility of simulator-based analysis in evaluating energy efficiency strategies and provides practical insights for offshore operators seeking to improve sustainability and compliance to EU regulations.
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  • THE EVALUATION OF THE WATER QUALITY OF TABACARIE’S LAKE

    Cristian-Gabriel DUMITRU; Lavinia-Maria CARABAȘU; Ștefania-Vali ȘERBAN
    10/1/2025
    DOI:10.53464/JMTE.02.2025.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the present paper, we will tackle the water quality problem in the lentic environment of one of the most well-known lakes in Constanta, Tăbăcărie. The pollution degree will be evaluated to identify the qualitative composition of the microbiota from the analysis sites, respectively, the chlorophyll indicator and the physical-chemical parameters (ammonium and phosphate ions, dissolved oxygen (DO), biochemical oxygen demand (BOD) and pH).
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  • INNOVATIVE LEADERSHIP IN ALIGNING SEAFARERS’ SKILLS AND POLICY IN THIS ERA OF EMERGING TECHNOLOGIES: IMPLICATIONS FOR A REGIONAL STRATEGIC POLICY AND TRAINING FRAMEWORK TOWARDS SUCCESS IN A DYNAMIC WORLD

    Angelica M.BAYLON; Vadm Eduardo Ma. R. SANTOS
    10/1/2025
    DOI:10.53464/JMTE.02.2025.02
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper investigates the impact of emerging technologies on seafarers' roles, focusing on how various Asia-Pacific countries are adapting their policies and skills development in the digital era. Using a descriptive research methodology—comprising observation, literature review, and content analysis, the paper explores the challenges and opportunities associated with the adoption of advanced maritime technologies and also examines the evolving landscape of seafarers' skills and policies amidst emerging technological advancements in the maritime sector, with focus on their implications for regional strategic policy development and training frameworks within the Asia-Pacific region. As digitalization, automation, and innovative maritime technologies reshape maritime operations, the demand for a highly skilled, adaptable, and technologically proficient seafarer workforce becomes paramount. The study explores current skills gaps, policy challenges, and opportunities for harmonizing regional standards to support sustainable maritime growth. Furthermore, it proposes a comprehensive strategic policy framework and a modular training program tailored to the unique needs of Asia-Pacific maritime nations, fostering resilience, safety, and competitiveness in the face of rapid technological change. Moreover, the findings also inform policymakers, industry stakeholders, and maritime education providers on effective strategies to equip seafarers with future-ready skills, ensuring the region's maritime sector remains robust and responsive to ongoing technological transformations. Ultimately, the study provide a roadmap for regional stakeholders especially in the Asian countries to harness emerging technologies effectively, ensuring a resilient, competent, and future-ready maritime workforce in the Asia-Pacific maritime context towards success in a dynamic world.
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  • STUDY ON RADIO DIRECTION ESTIMATION ALGORITHMS

    Andreea APOSTOL; Annamaria SÂRBU
    10/1/2025
    DOI:10.53464/JMTE.02.2025.01
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The presented paper analyses the steps by which radio direction estimation algorithms are used to visualize the direction from which a radio signal originates. This study aims to use ULA (Uniform Linear Array) and URA (Uniform Rectangular Array) antennas and integrate them into a simulation in order to find the direction of origin of the signals, what the contrast between the phase and time differences is when the signal reaches the antennas and how the systems for estimating the directions of arrival (DOA) affect the signal at the receptor. The difference between ULA and URA antennas is exemplified by using them in a more complex system that can be implemented physically and not just digitally. These two arrays of antennas have several particularities such as the DOA algorithms used by each antenna, its angled directions and their representation from a matrix point of view. The simulation was conducted as a preliminary study for a hardware implementation of this system using a USRP N 310 software defined radio platform.
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  • DIVERGENCE AND RECONVERGENCE OF SCIENCE AND RELIGION. RECONCILING MAN AND HUMAN SCIENCE WITH GOD

    Catalin Silviu NUTU
    4/1/2025
    10.53464/JMTE.01.2025.12
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper analyses the evolution of science in time and regards the relationship between science and religion from early times until present times. It shows that the origins of early science are to be found in monasteries and churches and the first universities were founded around these religious institutions. Later on, due to various motivations, mainly because of the abuses of the medieval church and of its representatives, but also due to rationalism which claimed to have all answers to scientific issues, the science continuously diverges from the religious belief. The present-day stage of the science, however, and the complicate issues science is struggling today with to solve, cannot anymore be explained by the blunt rationalism. Entering such serious predicaments, such as presented in this paper, the usual tool of the science which is the human reasoning is completely insufficient to explain many of the weird phenomena of Nature, and it seems that man should abolish this way of the blunt rationalism and should access mainly unknown forces like love or true faith.
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  • A MULTIDISCIPLINARY APPROACH OF COLD CHAIN TRANSPORTATION

    Feiza MEMET
    4/1/2025
    10.53464/JMTE.01.2025.11
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Perishables requested by consumers all over the world are transported intensively and request no interruption of the cold chain. In this context, cold chain logistics, quality and safety of the products together with convenient comprehensive cost of cold chain transportation are under the attention of all actors involved in the process. Refrigeration is the technology with a key role in this activity. It is a technology with high energy consumption and rises environmental problems. In this paper cold chain transportation is approached multidisciplinary, so that this manuscript can be used as a guidance for different specialists. Are provided fundamentals of vapour compression refrigeration systems and formulae for costs affecting the total cost of this activity. It is taken into discussion multimodal transport, being considered costs reflecting on shore and on board transport of perishables.
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  • ADVOCACY FOR OCEAN LITERACY AS A FUNDAMENTAL REQUIREMENT IN HUMANITIES SCIENCES GLOBALLY FOR SUSTAINABLE AND EFFECTIVE OCEAN GOVERNANCE

    Ciku Wanjiku KARANJA
    4/1/2025
    10.53464/JMTE.01.2025.10
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The implementation of UN [1] Sustainable Development Goals, specifically Goal 14, and the UN Decade of Ocean Science for Sustainable Development 2021- 2030, (UNESCO, 2021), has generated global interest in ocean literacy, albeit without corresponding formal impetus for formal adoption of the concept - as is the case for many developing countries. This paper explores the inextricable links between Sustainable Development Goals (SDGs) 14, 4 and 17. Ocean literacy is needed as a fundamental human science requirement for student and youth learning, across geographies, languages and curricula. Evidently, there are global examples of successful OL [2] initiatives which have been shown to be effective tools in creating unique, immersive, life-impacting learning experiences about the marine environment for both learners and educators. (Mann-Borgese et al., 2018) (Fauville et al., 2018a) Cognisance is also given to the current period of the UN Decade of Indigenous Languages 2022 – 32 (Martin, 2017), aptly displayed in the translation of the International Ocean Literacy Survey [3] (IOLS) framework into 16 international languages. (Fauville et al., 2018) The introduction of learner-friendly material, including in story-telling formats, is proposed as an effective learning tool for young learners. One such example is a cartoon publication in story format, illustrating ocean-literate choices based on IMO principles, translated by this paper’s author, into Africa’s most widely spoken Sub-Saharan language, Swahili,[4] – with relevance of indigenous languages. (Salawu, 2006). This submission advocates for learning systems that define relevant content and introduce ocean pedagogies aimed as empowering learners by establishing ocean literacy as a fundamental human science. The ability to effect positive and self-driven personal behaviour creates the best defence for ocean and planet sustainability by enhancing learners’ familiarity with ocean literacy principles, creating or strengthening the people-planet relationship, affect paradigm shifts in anthropogenic activities and inclusion of alternative marine environment education. (Watanabe, 2020). A collaborative approach amongst all stakeholders is necessary for the sake of the planet, people and progress.
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  • THE EUROPEAN GREEN DEAL: ARE GREEN ALTERNATIVES RELIABLE?

    Ștefan-Andrei GAIȚĂ
    4/1/2025
    10.53464/JMTE.01.2025.09
    9 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The European Green Deal embodies an audacious and all-encompassing vision for the European Union to tackle urgent environmental issues, counteract climate change, and foster sustainable growth. Renewable energy sources, including wind, solar, and hydropower, have become increasingly prominent. Renewable energy sources have exceeded the use of solid fossil fuels in their contribution to the overall energy supply in recent years. The European Union must devise a strategy to eliminate its most significant sources of pollution. This paper seeks to tackle the persistent energy issue by guaranteeing a smooth and effective transition to clean and efficient energy sources. The process entails expanding the range of energy sources, enhancing the grid infrastructure, and advocating for energy efficiency. In the last paragraph, it will be examined a potential course of action for executing the European Green Deal. Some of present suggestions include allocating funds towards renewable energy, enhancing the efficiency of public transit, and investing in education.
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