Items

  • SMART DEVICE FOR PET RECYCLING

    Fanel-Viorel PANAITESCU; Mariana PANAITESCU; Ionut VOICU; Marius Valentin DUMITRESCU; Diana-Mariana COCARTA
    4/1/2024
    10.53464/JMTE.01.2024.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    PET (polyethylene terephthalate) is a common plastic substance used to make water bottles, carbonated drinks, juices and others. PET is durable and easy to transport, but can be difficult to degrade in nature. If not recycled, PET can remain in the environment for hundreds of years, polluting the sea and other environmental areas. The work presents the creation of an smart device, which can easily, with low costs, be transformed in laboratory conditions, respecting the steps of the industrial technological process, of polyethylene terephthalate (PET) into recycled PET. The final goal is to research the mechanical characteristics of recycled PET. The method used is Computer Assisted Thermoplastic Extrusion, the main parameters of the entire technological process being permanently monitored. The results of mechanical and thermal tests were demonstrated that recycled PET can be transformed into filament for 3D printing of finished products that have properties similar to those obtained industrially.
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  • EXPERIMENTAL DETERMINATION OF ADDING CELLULOSE NITRATE TO THE OCTANIC NUMBER OF FUELS

    Traian DORDEA; Camil TUDOR; Lucian STĂNIA
    4/1/2024
    10.53464/JMTE.01.2024.02
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paperwork has as purpose improvement of anti-explosive properties of liquid fuels for spark ignition engines through nitrate addition and quantitative determination of the octane number resulting from the CFR ASTM Waukesha engine support.
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  • STUDYING THE INFLUENCE OF CELLULOSE TRINITRATE IN THE MODIFICATION OF PROPERTIES OF UNLEADED GASOLINE CO 95 AND VISUALIZING ITS INTERNAL STRUCTURE

    Traian DORDEA; Camil TUDOR; Lucian STĂNIA
    4/1/2024
    10.53464/JMTE.01.2024.01
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Celluloses as a part of biomass can be considered a source of cheap, renewal energy that can be transformed in energy directly through ignition or incorporating it is an usual fuel.
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  • ANALYSIS AND DIMENSIONING OF THE FUEL SUPPLY SYSTEM OF BULK-CARRIER

    Mihaela TUROF
    10/1/2023
    10.53464/JMTE.02.2023.14
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the context of the global oil crisis, in all fields, an optimization of fuel consumption and an improvement of the efficiency of energy installations are being attempted. Thus, the shipping and transport industry is converging towards this idea by implementing energy installations with increased yields and reduced consumption. At the same time, for this purpose, it is also tried to increase the efficiency through the appropriate preparation of the fuel or its burning in optimal conditions. Thus, in this context, the chosen topic aims to deal with aspects related to the dimensioning of the fuel supply system for a 178,000 tdw universal Bulk-Carrier. The ship is propelled by a B&W 8L60MC main engine that has been modernized in order to reduce consumption, noxious emissions and increase the energy efficiency index. Bulk-Carrier ships are intended for the transport of various goods in bulk: iron ore, grain, coal, phosphates and other similar goods.
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  • STATE OF THE ART IN BATTERY TECHNOLOGY: INNOVATIONS AND ADVANCEMENTS

    Nicolae Silviu POPA; Ciprian POPA; Vlad MOCANU
    10/1/2023
    10.53464/JMTE.02.2023.13
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper examines various types of batteries and their modes of operation in a rapidly evolving technological world. From the definition of batteries and the distinction between cells and batteries, to their history and uses in various applications, this study provides a comprehensive overview of the subject. Primary and secondary batteries are explored, with examples such as alkaline and nickel-metal hydride batteries, highlighting the characteristics of each. Additionally, lithium-ion batteries are examined in detail, including their specific properties and innovative mode of operation. The article also addresses charging and discharging methods, including LiFePO4 technology, providing a comprehensive understanding of these essential components in modern devices.
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  • REVIEW OF BATTERY TYPES AND APPLICATION TO WIND POWER GENERATION SYSTEM

    Ciprian POPA; Ion CHIABURU; Hristache ISAC
    10/1/2023
    10.53464/JMTE.02.2023.12
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper discusses diverse energy storage technologies, highlighting the limitations of lead-acid batteries and the emergence of cleaner alternatives such as lithium-ion batteries. It covers battery inspections, factors affecting battery life, and repurposing retired batteries. Additionally, it addresses challenges in wind power generation and the successful application of LL-type VRLA batteries in stabilizing power fluctuations.
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  • THE EIS METHOD CAN IDENTIFY CHANGES IN WATER CONTENT IN SOIL PORES: DETECTION OF DRY AND WET SOIL BY EIS METHOD IN THE CHERRY ORCHARD IN ŽABČICE, CZECH REPUBLIC

    Jana PAŘÍLKOVÁ; Zbyněk ZACHOVAL; Yanko YANEV; Tymoteusz ZYDROŃ; Andrzej GRUCHOT; David JUŘIČKA; Mariana PANAITESCU; Dana PAVELKOVÁ; Milan GOMBOŠ
    10/1/2023
    10.53464/JMTE.02.2023.11
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Climate change is a complex and to some extent defining problem of our time, including the issue of their monitoring. From shifting weather patterns that threaten food production, to rising sea levels that increase the risk of catastrophic flooding, the impacts of climate change are global in scope and unprecedented in scale. The each other interconnected processes of mass and energy transfer are well visible in an integrated dynamic system called the hydrosphere. The hydrosphere is the combined mass of water found on, under, and above the surface of the Earth. Meteorological conditions undoubtedly have, in addition to different agro-ecological conditions, a significant influence on the monitored yields and crop quality. The paper presents the results of the soil monitoring at cherry orchard Žabčice, Czech Republic in place with different species of grassland with different lengths of their roots. Monitoring was realized manually with frequency one per month with using Z-meter devices developed through international EUREKA programme. The monitoring system allows measurement at one selected frequency of the measuring signal, or measurement in a frequency band. Both approaches were used to monitor changes in soil water content. Changes in the water content in the soil were monitored during artificial irrigation of grass (frequency spectrum) with a mobile probe and due to changes in the weather - drought and after torrential rain on the site (chosen frequency of the measuring signal) with stable probes. For practical reasons to limit the influence of uncertainties, the measurement was conceived as relative, and therefore calibration was not carried out for e.g. relative humidity of the soil. The monitoring results show the possibility of using the measuring system for the given purpose in full, including the possibility of its automation.
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  • METOCEAN SPECIFICATIONS FOR WIND DATA BASE ON THE BLACK SEA

    Fănel-Viorel PANAITESCU; Mariana PANAITESCU; Cornel PANAITESCU; Alexandru Andrei SCUPI; Liviu STAN; FAITAR Catalin FAITAR; SUCIU George SUCIU; Madalin SILION; Stefan STEFANESCU; Nicoleta CAPBUN; Nikolay ZLATEV
    10/1/2023
    10.53464/JMTE.02.2023.10
    4 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper we present the steps to establish a design of floating wind turbine in offshore area. In order to be able to design a floating wind turbine in the offshore area of the Black Sea, data about the wind potential, the potential of waves and sea currents are needed, as well as wave-wind cross-data and other atmospheric data. It is assumed that the location of the floating turbine is the area of the Galata platform, Varna, Bulgaria, located at 25 km south-east of the city of Varna in the South-West Black Sea area. The wind dataset can downloaded from a server in NetCDF file form. The spatial data are used to generate wind maps showing the distribution of the mean wind speed for the full-time distribution (i.e. total time) and for the four seasons, respectively.
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  • EARLY TRANSHUMANISM IDEAS AND THEIR EXTENSIONS REGARDING EVOLUTION OF TECHNOLOGY AND OF ARTIFICIAL INTELLIGENCE

    Cătălin Silviu NUTU
    10/1/2023
    10.53464/JMTE.02.2023.09
    5 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents some very early transhumanism ideas and their relationship with the development of technology and how they almost virtually became reality in our days. Writers like Samuel Butler, Aldous Huxley or George Orwell have long time ago predicted some of the issues humankind will face and some of them also even suggested possible solutions to these future problems which nowadays have become reality. This paper also makes predictions about and presents extensions of these early transhumanism ideas, related to the very recent evolutions in technology and artificial intelligence, but it also presents related dangers and possible future evolutions and solutions to these actual problems, as envisioned by the author of this paper .
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  • A POINT OF VIEW ON FORMATIVE- EVALUATION OF PART- TIME STUDENTS IN CONSTANTA MARITIME UNIVERSITY- A CASE OF STUDY

    Feiza MEMET
    10/1/2023
    10.53464/JMTE.02.2023.08
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Part- time education is very attractive for students and universities, due to its obvious benefits related with economic, mobility and friendly education environment aspects. In Constanta Maritime University, part- time education is available for marine engineering, electrical engineering and navigation and waterborne transport programs. According to the Romanian legislation, the evaluation of part- time students consists in two types of assessment: formative evaluation and final evaluation. The formative evaluation is carried on by the use of the university’ E- Platform, while the final evaluation is face to face type- exactly like the one of full- time students. In the case of study, it is described the formative evaluation of part- time students enrolled in Marine Engineering program, second year of study, in the case of students’ performance assessment in Thermodynamics 1 Course. There are enrolled 52 students, but only 25 attended the formative evaluation, despite of the fact that this evaluation has a percentage in the final grade. This paper describes the manner in which this evaluation took place. Also, where analysed the reasons for not attendance and mistakes in test solving. Where identified the ways in which students performance might be improved, for a better understanding of the curricula.
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  • GENERATING A MESH TO DETERMINE THE BATHYMETRY IN THE HARBOUR

    Andreea-Irina IGNAT; Mariana PANAITESCU; Fănel-Viorel PANAITESCU; Ionut VOICU; Jana PAŘÍLKOVÁ
    10/1/2023
    10.53464/JMTE.02.2023.07
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper we present the steps to determine the bathymetry in the harbour. For this we can use software MIKE Zero to create various meshes, each designed to apply for a special modelling task. The bathymetry mesh is created from scratch and optimised to a satisfactory .
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  • ASSESSMENT OF THE QUALITY OF THE AQUATIC ENVIRONMENT IN THE AREAS BORDERING THE DEVELOPMENT OF FISHING ACTIVITIES

    Simona GHIȚĂ; Irina STANCIU; Adrian SABĂU; Sabina ZĂGAN; Iuliana ȘUNDRI
    10/1/2023
    10.53464/JMTE.02.2023.06
    5 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the present study, the main physical-chemical parameters (temperature, conductivity, turbidity, pH, dissolved oxygen, biochemical oxygen consumption, ammonium, nitrate and phosphate ions) and the representative groups of phytoplankton (green algae, cyanobacteria, diatoms and cryptophytics) are analysed with direct influence on the quality of aquatic life. The average values obtained by analysing the samples collected in July 2023 in the bordering area of fishing activities (marine site –Midia-Navodari area and Lake sites – Tasaul Lake and Siutghiol Lake) are presented and discussed. The modern techniques of in situ analysis of the physical-chemical and biological parameters of the water allowed an evaluation of the quality of the surface waters regarding the trophic potential. The optimal values of the indicators of the eutrophication regime and of the oxygen regime, as well as the presence of the main groups of primary producers, suggest the existence of favourable conditions for the development of fishing and aquaculture activities. The study contributes to the achievement of the general objective of the Dobrogea North FLAG strategy for the development of fishing activities based on the knowledge of environmental aspects, in order to maintain economic and ecological sustainability.
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  • STUDY OF HYDRO-METEOROLOGICAL CONDITIONS AND FUEL CONSUMPTION ON THE USUAL TRADING ROUTES OF VLCC (VERY LARGE CRUDE CARRIERS

    Iulian ENE
    10/1/2023
    10.53464/JMTE.02.2023.05
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper will be introduced some of the usual worldwide navigation routes of VLCC type vessels, with presentation of the data collected by the author on the voyages made by a ship with DWT = 307284 tons, during the period December 2015 – December 2018. For reasons of relevance, trips to the high seas lasting more than 7 days were chosen as much as possible. The objective is to investigate the usual hydro-meteorological conditions on some of the main trading patterns of the VLCC - Very Large Crude Carriers, (vessels intended for the transport of crude oil, with a carrying capacity of approximately two million barrels, DWT approximately 270000 - 330000 tons). Diagrams and tables with data collected are also presented. This may be of further assistance in studying the opportunities of using renewable energy sources, in particular the wind one, in order to improve the energy efficiency of such voyages.
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  • SEARCH AND RESCUE AUTONOMOUS VESSEL

    Ovidiu CRISTEA; Ștefan-Vlăduț ONEA; Silviu Nicolae POPA
    10/1/2023
    10.53464/JMTE.02.2023.04
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Search and rescue operations in maritime environments are critical for saving lives and ensuring the safety of individuals in distress. The advancement of autonomous technologies has led to the development of Search and Rescue Autonomous Vessels (SRAVs), which have the potential to revolutionize the efficiency and effectiveness of such operations. This paper presents an example of the design, capabilities, and challenges associated with SRAVs. The integration of various sensors, communication systems, and artificial intelligence algorithms allows these vessels to navigate autonomously, detect and identify distress signals, locate survivors, and provide immediate assistance. Also, there are presented results from testing the SRAV and future development perspective.
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  • FOUR-BAR MECHANISM FOR A PORTAL CRANE: A BRIEF OVERVIEW

    Milis Nilgun CAIBULA; Constantin MILITARU; Sorin CĂNĂNĂU
    10/1/2023
    10.53464/JMTE.02.2023.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The present article aims to increase knowledge of a four-bar mechanism. A four-bar system is a planar mechanism. There are many types of simple mechanisms, such as: Chebyshev, Chebyshev lamda, Hoecken, Roberts, Watt’s, Grasshopper, horse-head, pantograph and Peaucelier. More complex mechanisms are: Stewart platform or Jansen’s linkage. The determination of the degrees of freedom (DOF) for a system is done using the Chebychev-Gruebler-Kutzbach relationship. Due to this fact, the DOF for the four-bar system has the value one. Moreover, we analyze the following angles: θ, α, β and φ3in the mechanism. Finally, using Matlab software the drawing and the dynamic simulation of a four-bar mechanism is carried out. Besides, the dynamic simulation is represented after 3s, 6s and 12s.
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  • THE GREEN SHIPPING. STUDY ON REGULATIONS AND SUSTAINABLE OPTIONS FOR DECARBONISATION

    Grațiela BRÂNZĂ
    10/1/2023
    10.53464/JMTE.02.2023.02
    6 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The maritime sector is responsible for more than 90% of world trade. This generates increasing international shipping fleet, that means significant contribution to environment pollution. In this context, appears the need for a cleaner maritime transport, a green one. The paper presents the concepts of “green shipping”, “eco-ship” and regulations that must be respected in relation to environment protection. This study highlights also the IMO’s regulations for green shipping, as IMO is the most important organization that support the reduction of greenhouse gas emissions from ships. The work examines briefly few options for decarbonisation in shipping, outlining the role of government policies, for huge investments in new and clean technologies and, also, in infrastructure for the production, distribution and utilisation of alternative marine fuels and biofuels.
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  • THE ROLE OF SOCIAL MEDIA IN USER HEALTH

    Mihaela-Luminița BĂRHALESCU, Elena COSTESCU
    10/1/2023
    10.53464/JMTE.02.2023.01
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Human beings are social creatures. We need the company of others to thrive in life, and the power of our connections has a huge impact on our mental health and happiness. Being socially connected to others can alleviate stress, anxiety and depression, increase self-esteem, provide comfort and joy, prevent loneliness and even add years to your life. On the other hand, the lack of strong social connections can pose a serious risk to your mental and emotional health. In today's world, many of us rely on social media platforms like Facebook, Twitter, Snapchat, YouTube, and Instagram to find and connect with each other. While each has its benefits, it's important to remember that social media can never be a substitute for real-world human connection. It takes personal contact with others to trigger the hormones that relieve stress and make you feel happier, healthier, and more positive. Ironically, for a technology that's designed to bring people closer together, spending too much time interacting with social media can make you feel lonelier and more isolated — and exacerbate mental health issues like anxiety and depression. If you spend an excessive amount of time on social media and feelings of sadness, dissatisfaction, frustration or loneliness are affecting your life, it may be time to re-examine your online habits and find a healthier balance.
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  • AN ATTEMPT TO IMPROVE ENERGY EFFICIENCY OF VAPOUR COMPRESSION REFRIGERATION ON SYSTEMS WORKING WITH R134a

    Ionela TICU; Elena GOGU
    4/1/2023
    10.53464/JMTE.01.2023.10
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Refrigeration is an industry of high importance in our modern times. It plays also a key role in maritime transport of perishables, where vapour compression refrigeration systems are dominant. These energy systems are indispensable, but they should be wise exploited because their high energy necessity. One of the frequent refrigerant chemical adopted in this system is the hydrofluorocarbon R134a. This refrigerant came to substitute traditional refrigerants, such as chlorofluorocarbons or hydro chlorofluorocarbons – substances being under environmental regulations. In this study, it is approached a single stage vapour compression refrigeration system working with R134a. The aim is to find the conditions in which this system is more energy efficient. In this respect, based on the laws of thermodynamics, are obtained information on Coefficient of Performance and energy destruction trends – when the evaporator temperature increases. Our results indicate that, although the analysis based on the first law of thermodynamics reveals that the performance of the system is higher for high evaporator temperatures, the energy destructions in this system increase together with the evaporator temperature increase.
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  • PERFORMANCE ANALYSIS OF INERT GAS PLANT WITH SCRUBBER USING ANSYS FOR A VLCC SHIP

    Liviu Constantin STAN; Cătălin FAITAR
    4/1/2023
    10.53464/JMTE.01.2023.09
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Through the 1978 SOLAS Protocol and then through the introduction of amendments from 1981 and 1983, new specifications are brought regarding the design, operation, maintenance, verification of inert gas systems intended for both oil tanks and bulk chemical tanks, and, in general, the systems of safety on board ships carrying dangerous goods. The inerting method using a gas system with generator and scrubber involves a continuous and very efficient process, with a low level of supervision and maintenance, that is why this type of installation was chosen in this study. Installations with a scrubber type unit require the installation of an inert gas generator that operates at a pressure of 8-10 bar and releases nitrogen at 7-9 bar. The quality of the air will depend on the type of generator used, scrubber type unit, but air without impurities with the best possible quality is recommended. Nitrogen quality for a given unit varies with production rate and is generally 95-97% pure. By connecting high-quality scrubbers, nitrogen can be brought to 99% purity, but at lower production rates and much higher energy consumption rates of any system on board ship is specifically identified with its reliability. So as to get the best out of marine motors, it is critical to screen their performances and take measures to accomplish productive combustion. As a result of heat gains on board ships from engine rooms and crew, the increase in humidity as well as due to the various releases of gases from on board systems, room air deteriorates, requiring replacement and its processing through the HVAC (heat, ventilation and air conditioning) system. The combustion process in diese.
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  • NUMERICAL SIMULATION OF CENTRIFUGAL PUMP

    Andrei Alexandru SCUPI; Mariana PANAITESCU; Fănel-Viorel PANAITESCU
    4/1/2023
    10.53464/JMTE.01.2023.08
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Centrifugal pumps are most commonly used pumping devices in industry their being fit for pumping water. There are several types of centrifugal pumps, their differences in construction is due to their size and how cloggy the pumped water is. In the paper it was simulated a 2D centrifugal pump of small size used in daily activities. The simulation, performed with CFD (ANSYS-Fluent), was made for different inlet velocities of water. Different parameters, such as inlet pressure, outlet pressure, maximum velocity and flow rate, were calculated and graphically represented against inlet velocity. Also, graphical representation of pressure distribution .
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  • FTA ON SHIP FIREFIGHTING PLANT

    Mariana PANAITESCU; Fănel-Viorel PANAITESCU; Ionuț VOICU
    4/1/2023
    10.53464/JMTE.01.2023.07
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    One of the main causes of accidents on board ships is fire. This is because of the presence of high temperature, the excess quantity of flammable oil and other combustible materials. A ship is fitted with various types of fire retardant and firefighting equipment so as to fight any kind of fire and extinguish it as soon as possible before it turns into a major catastrophic situation. Purpose: This paper presents the crisis management on ship’s firefighting plant, Technical data for firefighting plant with foam, Fault Tree Analysis data, Fault tree block diagram, Failure probability and basic events of fault tree, The equations of fire analysis, The method of simulation, The simulation of a fire incident in the firefighting plant, for a ship named "Mamola Defender" which is a vessel that provides the supply of marine drilling platforms. The results are: Foam firefighting plant diagram, Locations for firefighting systems, Fire Control and Safety Plans, Fault tree block diagram, The values of probabilities, The relationship between input and output events. The results of simulation for a scenario are: radiant heat distribution of a jet fire, the heat flux, the temperature distribution on different stage of fire, the flame propagations. Conclusions: The methods which used for simulation present a possible fire incident in a plant with many hazardous materials. This method of simulation is useful to assistance plant owners and operators in different events of emergency situations. This methodology is useful to prevent human casualties and important structures.
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  • RELIGIOUS BELIEF, SCIENTIFIC REASONING AND ABILITY OF MAN TO SOLVE CLIMATE AND ENVIRONMENT ISSUES

    Cătălin Silviu NUTU
    4/1/2023
    10.53464/JMTE.01.2023.06
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents the main complicate science issues man has to solve, but it also presents reasons to explain his present incapacity to solve them. It also shows ways to address more successfully those complicate issues, in order to find their solutions.
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  • THE LOGIC OF HAPPINESS AND ITS RELATIONSHIP WITH ENVIRONMENTAL AND CLIMATE ISSUES

    Cătălin Silviu NUTU
    4/1/2023
    10.53464/JMTE.01.2023.05
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper is concerned with the logic of happiness, whereas happiness is most commonly seen by man as a function of fulfilled wishes. It also shows the disastrous consequences for man and his home planet when engaging in this damaging way to search for happiness. This paper also shows that the main reason for consume and overuse of planet’s resources is that man has been trained to consumerism by various tactics and strategies which were applied to him in the recent past, with the purpose of making him “successful” and a “good” citizen. This paper also provides some more conventional and some more nonconventional solutions to undone this evil of the “induced” necessity to consume in order to be happy.
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  • HURDLES IN APPROACHING SCIENCE AND IN SOLVING CLIMATE AND ENVIRONMENT ISSUES

    Cătălin Silviu NUTU
    4/1/2023
    10.53464/JMTE.01.2023.04
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Showing complicate issues in science, like the strange facts and realities pertaining to the quantum world, this paper explains why it is so difficult to understand and to solve those complicate issues. This paper also stresses the important fact, that in order to understand these strange realities pertaining to the quantum phenomena but also in order to solve other complicate problems of science such as the climate change issues, one should give up the traditional way of thinking of the science and should also renounce the false idea of the rationalism, stating that the entire reality can be known and understood by using scientific reasoning.
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  • EVALUATION OF THE SPECIFIC HEAT CAPACITY (SHC) OF WATER-Al2O3 NANO FLUIDS BASED ON A THEORETICAL MODEL

    Feiza MEMET
    4/1/2023
    10.53464/JMTE.01.2023.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Adding of nanoparticles in a base working agent leads to Nano fluids representing of a new type of working fluid. Due to an increase surface area, there is a gain in the surface area needed for heat transfer between nanoparticles and base fluid. Sein the poor heat transfer properties of water, water base Nano fluids present improved heat transfer performance and require smaller heat exchangers. This paper deals with the estimation of specific heat transfer capacity of water-Al2O3 Nano fluid. The decrease of volume concentration, from 13% to 3%, will reveal a gain in SHC of 27% - for nanoparticles diameter of 60 nm and a gain of 40% - for 30 nm diameter. At high temperature, SHC shows better values, also when the volume concentration is lower.
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