Journal of Marine Technology and Environment 2014 Vol. 1

  • ECOTOXICOLOGICAL ASSESSMENT IN SOME POINTS OF THE ROMANIAN BLACK SEA COASTAL ZONE

    Mirela- Iuliana SUNDRI
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    An ecotoxicological assessment on four points of the Romanian Black Sea coastal zones ecosystems was done using a 72 h algal growth inhibition microbiotest. Water samples toxicity has been tested on the Phaeodactylum tricornutum. Inhibition of algal growth ranged between 2% and 17%. Generally, Phaeodactylum tricornutum shows adaptability tendency to the specific conditions of the investigated areas during the time of the test.
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  • THE ANALYSIS OF SHORT-CIRCUIT CURRENTS IN A NAVAL ELECTRICAL NETWORK BY MEANS OF SOFTWARE TOOLS

    Gheorghe SAMOILESCU; Georgiana MARIN
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    Short circuits in naval electrical networks are complex phenomena affecting all electrical equipment due to the short length of circuits. The calculation of short circuit currents and their taking into account, ranging from design to the operation of naval equipment and installations, ensure the equipment reliability and optimization. Based on industry standard data, the paper analyzes the management of a particular ship power system, by performing the short-circuit current calculation based on a software tool, particularly designed for this purpose.
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  • THE ASSESSMENT OF CONVECTIVE COEFFICIENT OF HEAT TRANSFER IN EVAPORATORS WORKING WITH R 134a, USING KANDIKLAR EQUATIONS

    Daniela-Elena MITU
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    Heat transfer devices play important roles in the improvement of refrigeration systems performance and for this reason their design is a challenge for engineers. This paper deals with the assessment of convective coefficient of heat transfer in evaporators from one stage vapor compression systems working with R 134a, using Kandiklar equations. The general simple equations for heat exchanger analysis are introduced inside tube refrigeration evaporation where heat transfer correlations for thermal design are given. The sizing methodology of these type of heat exchangers are briefly discussed and a thermal design exemple is presented. The heat exchanger design provides missing information based on experiences, judgment and the requirements of the customer.
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  • CONSIDERATIONS ON THE PERFORMANCE OF SINGLE VAPOR COMPRESSION CYCLES WITH SUPERHEATING AND WITHOUT SUBCOOLING

    Feiza MEMET
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    In this paper it is evaluated the global performance of an one stage vapor compression cycle with superheating and no sub cooling, calculated as the ratio between refrigerating capacity and electrical power supplied to compressor (COP). It is stated that the superheating of the refrigerant in vapor state occurs inside the refrigerant space. This phenomenon is spontaneous and useful for the protection of the compressor. Since the ban of Hydrochlorofluorocarbons (HCFCs), Hydrofluorocarbons (HFCs) are used as alternative, one of the most visible in marine refrigeration being the non ozone depleting R134a. But the environmental issue does not only include the ozone layer; there is also an increasing worry about the global warming potential due to greenhouse effect. This is why the objective of this work is oriented on the performance of an one stage vapor compression cycle working with R134a and two more refrigerants, having lower GWP. These are R290 and R152a. The analysis for specific conditions will reveal that even if R152a has higher GWP than R290, its COP is better than R134a and R290.
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  • ANALYSIS OF SHIP OPERATION FOR A CONTAINER TERMINAL

    LOKE K.B.; A.H. SAHARUDDIN; A.R. IBRAHIM; I. RIZAL; A.S.A.KADER; A.M.ZAMANI
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    This study is looking for delay factors of ship operation in a container terminal. Ship operation is a complex process that is affected by many factors, such as weather delays, vessel delays and stevedore delays. These factors will slow down the handling performance and increase the handling time and cost. Hence, secondary data is collected from Malaysian Port and analysis by SPSS. Correlation and pie chart are used to analysis and display the result. The initial result showed that the main cause of delay is stevedore delays (82.60%) and have high correlation with berth turnaround time (0.831). This study further analysis stevedore delays; the results showed that waiting for prime mover is the main delay factor, which contributed to about 41.2% that affected the performance of ship operation. It also has high correlation with berth turnaround time (0.716). Therefore, this study concluded that the stevedore delays and waiting for prime mover is the main cause of delay in ship operation in a container terminal.
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  • NEW TECHNOLOGIES USED FOR AUTOMATION OF CONTAINER HANDLING AT TERMINALS

    Valentina GRANCHAROVA
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    Introducing of advanced and innovative technology for optimizing physical operations resulted from increased flow of goods through container terminals. The paper highlight about automatization in the terminals, which might lead to better productivity level, flexible work environment and effective utilization of resources. Many terminals are seeking the proper solutions for reducing the operational costs and providing an increased level of service to its customers. Information technology is now essential element of global economy. Container terminal operators are providers of container handling services and deals with the shifting of trend towards containerization of exports and imports. The efficient operation of a container terminal also depends on how efficiently it can process large volumes of information. Therefore the application of information technology to container terminal operations and management is critical to the success of the terminal. This will also include electronic data interchange of information between the terminal and its users. In this paper are proposed some decisions, concerning automation of process at terminals.
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  • AUTOMATED AND MECHANICAL EQUIPMENT FOR COLLECTING OF METEOROLOGICAL INFORMATION ON BOARD OF THE SHIP

    Ivaylo GRANCHAROV
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    The need for reliable, accurate and comprehensive information about the weather conditions is essential for the safety of shipping. This paper discusses the various types of equipment for obtaining information about meteorological parameters on board of the vessels, their advantages and disadvantages. It emphasis the need for automation of the process to assess the weather situation in a view to save valuable time in the busiest shipping today. Officer of the Watch (OOW) should use all equipment available on board to make meteorological observations. The systems Navtex and Inmarsat-C serve to transmit MSI to ships. Constantly measuring the meteorological parameters the mariners can assess the reliability of weather forecasts prepared by coastal meteorological centers. Considering that OOW have very limited time for measuring the weather parameters, the introduction of the weather stations on board of the vessels is a key innovative technology for the safety of navigation and gives clear and precise meteorological information.
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  • QUANTUM DOTS INTERACTION WITH PROKARYOTES INVOLVED IN THE MARINE BIOREMEDIATION PROCESS

    Simona GHITA; Iris SARCHIZIAN
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    Semiconductor nanocrystals (quantum dots QDs) are known to show desirable optical characteristics like photostability, fluorescence properties, broad absorption spectra and sizedependent narrow emission spectra, leading to major advances in medical diagnostics, targeted therapeutics, microbiology, molecular and cell biology. In this paper we present our results concerning the interaction of CdSe/ZnS core-shell quantum dots (490 nm; 520 nm; 560 nm and 600 nm) with long chain amine capping agent with hydrocarbon-oxidizing bacteria. The biological samples used are natural populations of cyanobacteria and heterotrophic bacteria from the Black Sea. Quantum dots that emit at 520 nm and 600 nm allow the visualization of the microorganisms, but the experimental values obtained are close to the number of dead cells (PI positive) and not the total number of cells (DAPI), suggesting that QD label almost exclusively dead cells.
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  • NEW TRENDS IN THE CONTENT OF THE BULGARIAN NAUTICAL NAVIGATION CHARTS

    DACHEV YURIY
    4/1/2014
    Marine sciences and engineering ; Renewable energies ; Marine renewable energies and Sustenability ; Advanced technologies for MET ; Climate changes
    International standard for nautical navigation charts consists in international nautical navigation charts and their symbols. This charts are published by the United Kingdom Hydrographic Office. From several years we have seen new trends in worldwide view for preparation of the nautical navigation charts. Hydrographic Offices of many maritime countries, including Bulgaria, began to make a significant changes in the nature and the content of their modern nautical navigation charts. The most important changes are observed in the symbols, in the used colors, in the duplication of all texts on local and English languages, in standardization of the characteristics of navigational aids, in the ground of the seabed, in the sources of information, etc. The major advantage of all these changes is that the nautical navigation charts of these countries will become competitive to the international charts issued by the United Kingdom Hydrographic Office. The report examines the Bulgarian nautical navigation charts issued until now and trends in their content in accordance with international standards in this field and increases their competitiveness in the market for this product.
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  • PRINTED THICK FILM HEATING ELEMENTS FOR USE IN SHIPS

    Bohos APRAHAMIAN
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    The paper presents our work in developing printed thick film heater elements on ceramic substrates for heating in the range of 300 – 400 oC. Two types of samples are realized and experimentally investigated. Their leakage currents are measured and their resistance to the sea mist impact is checked. The heater elements on ceramic substrates are considered promising for application in ships.
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  • CONSIDERATIONS REGARDING THE IMPACT OF SHIP INTACT STABILITY LOSS ON MARINE POLLUTION

    Cristian ANDREI; Marinel-Dănuț LAMBA; HANZU - Pazara-Radu; Belev BLAGOVEST
    4/1/2014
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes
    The article presents very important aspects of marine pollution generated by the loss of intact ship stability. Based on the statistics issued by maritime organizations, it is presented the correlation between loss of ships intact stability and the hull structural failure, being revealed that the first can be considered as a primary event in certain accidents of marine pollution. Moreover, the paper illustrates correlation between loss of intact ship stability and pollution of marine environment not only by oil but also by harmful substances contained in bulk cargo transported on board ships and accidentally discharged into the sea due to ship stability failure.
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