The article presents a study of the possible use of materials with Shape Memory Effect (SME) in shipbuilding, which have two special abilities of transformation and changing shape with changing of temperature or deformation. Among the most well-known SME materials, our study focuses on Ni-Ti and Cu- based alloys. An example of the existing fabrication presents casting of Ni-Ti in the form of a disk, and a new approach – continuous casting of Ni-Ti and CuAlNi alloys in the form of rods. In the article some results are shown of characterisation of microstructure and the basic properties. This was done in accordance with the fact that such scientific approach could define the starting point for further identification of the functional characteristics of these alloys by knowing the their chemical content and microstructure. Numerous studies are being carried out today in order to find the optimal functional characteristics of SME alloys. All of this is aimed at optimising the fabrication of these alloys, with the achievement of suitable properties for application in shipbuilding.
This research paper discusses preventive protection of the marine engine against abrasive effects of the catalyst fines in fuel. The relevant facts were gathered while analysing the performance of the slow-speed Wärtsilä RTA engine on an Aframax tanker. The analysis comprised fuel properties, regular and extraordinary examinations of the engine, including the control and replacement of piston rings and the measurement of the liner wear rate. The research particularly focused on the top compression ring as it withstands highest loads and fastest wear. On the other side, the research involved a chemical analysis of the piston rings with the purpose of establishing their chemical properties, structure, coating thickness and micro-hardness. In addition to a number of preventive measures that can be taken on board before injecting the fuel into the combustion chamber, the selection of a piston ring's material quality affects its wear rate to a large extent. The wear rate also depends on the catalyst fines in fuel. In practice, the piston ring of GGV type proved to be resistant to abrasive wear and its chemical properties were established through laboratory material testing.
Prevention of air pollution from ships, according to MARPOL Annex VI, regulates the emission of specific pollutants contained in the exhaust gases into the atmosphere. In this paper, the Port of Kotor is analysed as a case study because of its distinct geographical features, permanent attraction for tourists, and the title of the third busiest port in the Adriatic in 2017. Ships arriving to the Port of Kotor represent one of the major sources of air pollution not only in the Port area, but also in Boka Kotorska Bay as an approach route towards the Port. For calculation of air pollution inventory in this case study, ship engines’ power method was used. The focus of the research analysis is on the cruise ships visiting the Port of Kotor in 2018. For that reason, all ships under 500 GT were excluded from the analysis. The pollution shows clear seasonal pattern characteristic for ports in the Mediterranean. This behaviour is emphasised as an increasing problem that needs to be addressed. The seasonal pattern causes 82.6% of all air pollution from cruise vessels concentrated in the period from May to November.
Boka is undeniably one of the most beautiful destinations in the world. This may be a subjective opinion, however being included in UNESCO’s world heritage list may be an objective proof of such a statement. This is recognized by the Government, and nautical tourism has been set as one of the main development strategies for this area. The economic growth, on the other side brings problems that our limited sources can hardly cope with. Increased traffic i.e. number and size of vessels (boats/yachts/ships) that are visiting Boka Bay, enormous fuel quantities burnt by giant engines on mega cruisers, by-products of every day processes such as garbage and sewage cause many side effects that could be hidden. These are all risks that could create catastrophic consequences if not handled properly, and in long term, may turn one of the finest destinations into a place to be avoided. Navigation is a skill. Years of experience are required to become professional navigator. It is not a sport and it is risky to treat it like that. Risk management concept will be utilized for assessing mentioned risks and for establishing controls that will definitely reduce them. After short introduction of the concept, priority will be given to analysis of all factors that must be taken into account for successful risk assessment. Special attention will be paid for database that must be established for Boka Bay area. Next step in the process is identification of all hazards related to visits of different types of vessels. Setting the criteria and matrixes that are relevant for this special area is essential before final part of the research focused on risk assessment.
Considering the importance of adequate understanding of instruction books and manuals on board vessels all over the world, as well as the challenges it imposes to the English language teachers and course designers, this paper aims to answer important research questions in relation to the quantity and type of vocabulary required for their adequate reading comprehension. In this study we use the method of Lexical Frequency Profiling and the software developed by Anthony Laurence – AntWordProfiler 1.4.0w. The corpus is comprised of 1,769,821 running words obtained from instruction books and manuals of various ship and machinery types. The results of this study point to the high technicality and lexical demand of the corpus, which calls for a highly technical English courses’ design and further research in marine engineering (English) vocabulary. Additionally, the research findings point to the need of creating a marine engineering-specific word list.
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