Items

  • WATER-OIL AND WATER-COAL DUST ARTIFICIAL FUELS: ITS ENERGETIC, ECONOMIC AND ECOLOGICAL BENEFITS

    Tudor SAJIN ; Ștefania Roxana BUZDUGA; Florin ANITEI
    10/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    To stabilize the burning of heavy oils and coals with high content of water and reduce the pollution from the combustion installations, the fine emulsions of water in heavy oil and the fine suspensions of coal dust in water are prepared. Thus, from natural fuels with high water content are obtained artificial liquid fuels with water in excess, which improves some economic, energetic and ecological indicators of burning process. In principle, these fuels can be adapted for the utilization in the energetic installations off marine ships. This paper presents the economic, energetic and ecological indicators of combustion of water-oil emulsions and water-coal dust suspensions on a test installation.
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  • INDUCED MARITIME ACCIDENTS & SLOW SHIPPING

    MONTES DE OCA R, Reynaldo; MARTÍNEZ Marin. Jesus E.
    10/1/2013
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Maritime accidents, share some factors already considered by the International Maritime Organization (IMO) and the researchers of the maritime world. The accelerated technological’s changes, has allowed significant improvement of human activities, in many cases, improving the effectiveness and efficiency in the majority of the fields, of which marine transport is not the exception. Unfortunately in some cases, new technologies have led to relaxation in safety, so the idea to establish some minimum parameters, it is essential to ensure the safety of human life at sea, for increase the prevention of accidents and protection maritime environment.
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  • A THEORETICAL ANALYSIS OF A VAPOR COMPRESSION SYSTEM ON ENVIRONMENTAL AND THERMODYNAMIC BASIS

    Feiza MEMET
    10/1/2013
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Most of ships worldwide currently use as working agent hydrofluorocarbon R134a (HFC134a) in direct expansion refrigeration systems. International concern forces shipping sector to use refrigerants with low value of GWP (Global Warming Potential), an index comparing the climate impact of an emission of a greenhouse gas relative to that of emitting the same mass of carbon dioxide. The widespread refrigerant on board the ships, R134a, has a 100-year GWP=1300, while its possible alternative, the hydrofluorocarbon R152a (HFC-152a) has a GWP=140. Starting from the environmental benefit shown by R152a, a thermodynamic comparison between R134a and R152a is made in this paper. Results will indicate the opportunity of the substitution.
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  • ENERGY EFFICIENCY IMPROVEMENT OF SHIP MOTOR DRIVEN SYSTEMS. HIGH EFFICIENT MOTORS AND DRIVES

    Elena KATELIEVA
    10/1/2013
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of this paper is to show potential measures and practices for energy savings and to give recommendations for energy efficiency improvement of ship motor driven systems. For overall energy efficiency improvement of the ship is essential for companies to implement specific energy policy and to develop an energy management plan. As the motor driven systems are the largest energy consumer on ship optimisation of the performance of these systems will provide greatest energy savings. For achieving efficiency optimization it is necessary to determine baseline data of the system, identify and implement the most appropriate measures and practices.
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  • SUSTAINABLE PORT DEVELOPMENT IN CONNECTION WITH ENVIRONMENTAL REGULATIONS

    Valentina GRANCHAROVA; Ivaylo GRANCHAROV
    10/1/2013
    4 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Modern ports as a part of logistics chain and the transport networks are under sustainable development and process optimization. Port expansion should always be considered in the context of environmental legislation and its implementation in different national laws. The paper discusses the introducing of major environmental requirements for port development activities.
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  • VIRTUAL DIALOGUES WITH RUDOLF DIESEL: A SAMPLE OF TEACHING/LEARNING MATERIALS FOR BEGINNERS IN MARINE ENGINEERING

    Nadiya DEMYDENKO ; Skidanchuk SERHIY; Ochkovskiy SERHIY; Vigovskiy VIACHESLAV
    10/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents the materials of experimental class-room activity which is a part of the project approved by the Ministry of Education and Science of Ukraine. The project aims to create a Study Pack of Maritime English Introductory Course. One of the objectives is to find out methodological principles based on the interdisciplinary co-operation with specialists who are teaching major subjects. The great part of work has been done by senior students. The authors are thankful to the Department of Marine Engineering for the reasonable approach to the initiative, participation and assistance in preparatory work.
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  • STUDY OF CORROSION RESISTANCE OF CONTACT RIVETS OF ELECTRICAL APPARATUS WITH NANOSTRUCTURED COATINGS OF THE TI/TIN TYPE

    Bohos APRAHAMIAN; Alexander GAYDARDZHIEV; Maik STREBLAU
    10/1/2013
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The article presents the results of studies of corrosion resistance, in particular the resistance of contact rivets of electrical apparatus with nanostructured multilayer coatings of the Ti/TiN type – the so-called superlattices, to salt sea mist. The possibility of using these contact bodies at sea has been experimentally proven.
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  • ONLINE TRAINING FOR HIGHER EDUCATION

    Liviu-Constantin STAN
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Last years showed an increased interest on the concept of life long learning, especially in the European countries. Many activity fields, including maritime area involve this concept. A modern society must keep the level of knowledge of its citizens continuously updated to actual development, mainly in the fields of interest. This requirement can be accomplished by teaching and studying solutions that will use all available options including internet. The present paper is showing on already applied online teaching system used by our university, designed to offer easy access to information for teachers and students, but also available for former students, now officers onboard ships, in order to be able to update latest information’s about technical development in maritime field necessary in their duty activities. The online teaching techniques are used for the development of the concept “train the trainers” in our university for younger lecturers, to help them to integrate in the academic training system, through the project named “Seafarers’ environmental, social and cultural implications of sharing life on board ship within multinational crews – SeaCultLife”, dedicated to the development of the younger and experienced lecturers competencies related to the training domain requirement and also development and improvement of the skills in using of the newest teaching and training techniques.
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  • OPERATIONAL MANAGEMENT WITH APLICABILITY ON ANTIFOULING MARITIME ECOLOGICAL SYSTEM

    Ileana-Irina PANAITESCU; Fanel-Viorel PANAITESCU
    4/1/2013
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The triggering mechanism of tin copolymer antideposit products for hull protection was reproduced in a system based on the unique technology that uses copper acryl. Similar performance levels of antifoulling (that can last up to 3 years) are results of a new tin free system for coastline ships. The auto-polishing characteristics of copper acryl result from a controlled hydrolytic process, which is similar to the tin copolymer triggering mechanism. The active agent releasing level is sustained throughout the lifetime of the cover, by the chemical control of size and composition of the active zone. Performance characteristics are specially designed for coastline ships, the sustained releasing level of the biocide substance is made for long docking periods and high levels of antifoulling levels permit maximum efficiency for operating ships. The economic and environmental benefits are done by giving up to usual antifoulling auto polish substances and using Ecoloflex instead. Thus money is saved by reducing fuel consumption and environmental taxes. Ecoflex antifoulling systems contain only copper based biocide that decays fast when released in a marine environment.
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  • WATER DROPLETS ELECTROCOALESCENCE AND INSTABILITIES IN CLEANER PROCESS OF OILS AND FUEL OILS FOR MARINE ENGINES

    Constantin-Narcis OSTAHIE; Tudor SAJIN
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    An analysis of water droplets electrocoalescence from a water-in-dielectric liquid emulsion, in an electrostatic oil cleaner process is maded in this paper. The efficiency of electrostatic purging of marine fuels and oils is analyzed. It is studied an electroseparator for dielectric liquids by own conception and the effect on water droplets instabilities under an electric field. It is studied a case that is not studied frequently, that of an inhomogeneous electric field. The process is simulated using CFD software with the capability to provide visual and mathematical data.
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  • SOME ASPECTS REGARDING AN ELECTROSTATIC CLEANER PROCESS OF MARINE OILS AND DIESEL FUELS

    Tudor SAJIN; Constantin-Narcis OSTAHIE
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper treats the problem of cleaning and reconditioning of waste oils and diesel fuels with mechanical impurities used in marine engines. The influence of different physical quantities involved in the electrostatic cleaner process are considered on the basis of dimensional analysis. The relative processing time is determined against the criteria, on which depends the kinetics of electrical separation in order to determine the efficiency of the process.
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  • THEORETICAL STUDY FOR EFFICIENT LENGTH AND DIAMETER APPLIED TO A COMPRESSED AIR INSTALLATION

    Ion OMOCEA
    4/1/2013
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    A compressed air installation becomes efficie4nt if the investment made leads to minimal expenses per cubic meter of compressed air. This is why we will analyze it from the economic viewpoint. All parts of the installation have a significant contribution in investment and expenses.
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  • EFFECT OF WELDING PROCESS ON MECHANICAL AND MICROSTRUCTURE PROPERTIES OF 5083 ALUMINIUM ALLOY JOINTS USED IN SHIPBUILDING

    MOHD NOOR C.W.; FERRY M.; AZLAN M.
    4/1/2013
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The present investigation is aimed to study the effect of welding processes such as TIG and MIG on mechanical and microstructure properties of 5083 aluminium alloy. The preferred welding processes of this alloy are frequently tungsten inert gas (TIG) and metal inert gas (MIG) due to their comparatively easier applicability and better economy. In this alloy, the weld fusion zones typically exhibit coarse columnar grains because of the prevailing thermal conditions during weld metal solidification. This often causes inferior weld mechanical properties and poor resistance to hot cracking. Two sets of 5083 aluminium alloy plates which normally used in ship construction have been selected as a sample material. The mechanical testing and microsture examination were performed and the results are compared. From this study it is found that TIG joints of 5083 aluminium alloy showed superior mechanical properties compared to TIG joints.
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  • ENTROPY GENERATION IN A STEADY STATE HEAT CONDUCTION: A STUDY FOR THE PLANE WALL

    Feiza MEMET
    4/1/2013
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In technical applications, there are many processes developed at high temperatures. Loss of heat to the surrounding represent a loss of energy, an important task of engineers being to minimize heat losses. In all types of heat transfer processes, thermodynamic irreversibility is associated with entropy generation, which results in the destruction of available work. In a pure heat conduction process, the generation of entropy is the result of heat transfer through a finite temperature difference. This paper investigates entropy generation during onedimensional steady state conduction through a plane wall. Are considered two situations: uniform thermal conductivity without additional internal heat source and uniform thermal conductivity with additional internal heat source. For the both situation will be discussed the temperature distribution in the plane wall.
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  • FLOW FIELDS IN THE CONICAL CHANNEL OF MICRO HYDROPOWER CONVERTER IN PRESENCE AND IN ABSENCE OF TURBINE STAGES

    Tudor SAJIN; Gheorghe Marius MARIAN
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    For a new concept of micro hydropower converter with positioned in gravitational vortex flow multistage turbine rotor with different values of specific speed has been modeled the velosity field of water flow through the conical channel in the absence of the turbine stages and was determined the flow structure by the computer simulation in the presence of the turbine stages. In the first case, the stream lines appear as helical spirals. The distributions of circular, radial and axial velocity components in the boundary layer, in the potential flow (zone of the free vortex) and in the forced vortex was determined. In the second case the structure of the water flow is changes with the formation of individual swirls in every area between the blades. The water velocity increases rapidly as proximity to the drain hole and strongly depends on sink and vortex strengths.
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  • ENERGY CAPTURE IN THE GRAVITATIONAL VORTEX WATER FLOW

    Gheorghe-Marius MARIAN; Tudor SAJIN
    4/1/2013
    10 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The theoretical and experimental study of a new type of micro hydropower converter is realized. The converter may be used for energy conversion of river water with small heads and coastal currents into mechanical work by local restructuring of water flow through a vertical conical channel in spiral form of gravitational vortex. In this vortex, at different heights of the conical channel, are positioned the rotor blades of the turbine with different values of specific speed. The characteristics of the gravitational vortex flow of water through the conical channel, the speed and the power characteristics of the micro hydropower converter were investigated and experimentally validated.
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  • THE PERCEPTIONS OF RESPONSIBLE TURKISH OFFICERS FOR INFIRMARY OF THEIR PROBLEM SOLVING ABILITIES

    Kuleyin BARIS ; Koseoglu BURAK ; Ali-Cemal TOZ
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Comparing to all assigned jobs or work to earn a descent income, money, then no other professions that are more risky compare to seafarers. For we know that all of the jobs or works are all risky too but a seafarer is the most risky profession of all. After graduation from own school, many officers assigned for health officers on board although lack of experience. The aim of the study is to determine the perceptions of responsible Turkish officers for infirmary of their problem solving abilities’ level and to find out whether their perceptions differ according to age, gender, marital status, school graduated, competency level, experience and additional health training. In this study survey (questionnaire) method was used. Problem solving inventory (PSI) which was developed by Heppner and Petersen in 1982 and in 1993 PSI was realigned in Turkish Version by Sahin and Sahin was filled to the officers by their companies which they work as an officer. Frequency tables, descriptive statistics, reliability analysis, Kolmogorov - Smirnov Z test, single direction variance analysis (ANOVA), LSD test and independent sample t test are used in the analyses of data.
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  • SAFE ACCESS AND OPERATIONS WITHIN PORT AREA

    Vallentina GRANCHAROVA; Ivaylo GRANCHAROV
    4/1/2013
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    An important aspect of all operations performed in port area is safety. This means protection of marine environment, port structure, facilities and human’s life. The paper offers an overview of some important points, concerning safe berthing access, navigation and safety performing of cargo handling operations within the port area.
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  • MARINE PRACTICE GUIDELINES FOR FUEL CELL APPLICATIONS

    GONZALO-MUÑOZ A.; MAS-SOLER J.; NAVARRO E.; LEO TERESA J.
    4/1/2013
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper focuses on the implementation of fuel cells in marine systems as a propulsion system and energy source. The objective is to provide an overview of the pertinent legislation for marine applications of fuel cells. This work includes a characterization of some guidelines for the safe application of fuel cell systems on ships. It also describes two ships that have implemented fuel cells to obtain energy, the Viking Lady, the first marine ship to include this technology, and Greentug, a reference for new tugs.
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  • TECHNO-ECONOMIC STUDY OF ELECTRIC CATAMARAN FERRYING PASSENGERS CROSSING KUALA TERENGGANU RIVER

    FERRY M.; C.W.NOOR; AMAHEKA S.
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Catamaran floats on two demihulls, that are slimmer, shallower than single hull of an equivalent capacity, has less weight, small draught, more deck area for passengers and more stable. Due to these features catamaran may be powered by electric energy makes it more economical. Electric motors as the prime mover maintains high efficiency over a wide range of loads and speeds, has small weight, very low maintenance and repair cost compared to diesel engines or outboard motors. Battery is used as energy storage that enables the catamaran operates as ferry for transportation at rivers which is more efficiently due to its low operational cost; pollution free hence environmental friendly. The obstacle of this transportation system is that the distance to be traveled is limited and depends on the capacity of the battery. Recharging the battery should be done through an electric charger with high charging capacity per hour connected to the electricity line exist at the jetty. The monthly operational cost of catamaran boat is more less compare to the monohull diesel boat. Such type of ferry is effective for connecting two closed places on rivers or as a means of inland waterways transportation for tourism along rivers, canals or small lakes with limited sailing time. In this case the route is taken for Kuala Terengganu River at Kuala Terengganu, Malaysia.
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  • TEACHING MARITIME ENGLISH: WRITING GLOSSARIES IN EDUCATIONAL PURPOSES

    Naduya DEMYDENKO
    4/1/2013
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper suggests the analysis of what a glossary is and how glossaries can be used in the process of teaching/learning materials development. A glossary is considered to be a form of a dictionary. Its various formats and purposes may be of great help when planning everyday practical language or specialist teachers’ activities including assessment sessions in case if the knowledge of a term and its definition are required. The description is supported by the samples used in work with Marine Engineers.
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  • RADAR IMAGE DESCRIPTION USING AUTOREGRESIVE AR(4) TIME SERIES AND HIGH ORDER SPECTRAL MOMENTS APPROACH

    DOYNOV Bozhidar; ZACHARY Popov; CHAVDAR Alexandrov
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This article presents an attempt for modeling and estimation of radar images of a ship (presented as a rough surface) using high order spectral moments and time series. Experiments with real images obtained by a costal surveillance radar are described. The results are estimated by using autoregressive models of fourth order. Experimental results with AR(2) and AR(4) have been compared and discussed.
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  • MODEL-BASED TORSIONAL VIBRATION OF MARINE INTERNAL COMBUSTION ENGINES - Part 2

    Nicolae BUZBUCHI; Liviu-Constantin STAN
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of the present paper is to be a tutorial one, intended to show the model of torsional vibration of the high power marine engine shafting systems. Extension of the analytic method for a multi-dimensional system, modeling of typical marine propulsion plant, and results for some realistic examples are also presented.
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  • MODEL-BASED TORSIONAL VIBRATION OF MARINE INTERNAL COMBUSTION ENGINES Part 1

    BUZBUCHI Nicolae; STAN Liviu-Constantin
    4/1/2013
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of the present paper is to be a tutorial one, intended to show the model of torsional vibration of the high power marine engine shafting systems. Extension of the analytic method for a multi-dimensional system, modeling of typical marine propulsion plant, and results for some realistic examples are also presented.
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  • PSEUDORANDOM NUMBER GENERATOR

    Denitsa BOTEVA; Tsanev YONKO; Marian TRENDAFILOV
    4/1/2013
    3589 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper presents a random numbers generator based on linear feedback shift register (LFSR) and hash function. The development is made under MatLAB and some statistical tests are applied to output sequences. The generator is based on dsPIC microcontroller and has an ability to modulate sine wave by FM and BPSK.
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