Marine engineering and nautical studies
| 1. | Enco Tirelli, Dragan Martinović : A NEW MARINE GAS TURBINE GENERATION IN EXCHANGE OF THE LOW-SPEED MARINE DIESEL ENGINES |
| 2. | Josip Luzer: A MULTILINGUAL MARINE ENGINEERING DICTIONARY |
| 3. | Julije Skenderović, Jasminka Bonato: COLLISION AVOIDANCE AT SEA BASED ON NEURAL NETWORKS MODEL |
| 4. | Dinko Zorovic, Robert Mohovc, Dani Mohovic: A CONTRIBUTION TO THE DETERMINATION OF THE RELATION BETWEEN THE LENGTH AND PERIOD OF THE ADRIATIC SEA WAVES |
| 5. | Mica Savić: LINEAR IMPARTIAL EVALUATION AND THE LEAST SQUARE METHOD |
Dr. sc. Enco Tirelli Preliminary communications
Mr. sc. Dragan Martinović UDK: 621.436
Faculity of Maritime Studies 621.438
Studentska 2, Rijeka 629.5
E-mail: tirelli@pfri, dragec@pfri.hr
The environmental protection standards and the need for a better efficiency rate of propulsion engines have finally produced the first results. Large NOx emissions in low– speed marine diesel engines have been limited by new regulations as of the year 2000. Since 1997 most gas turbine manufacturers (IHI, KHI, Daihatsu Diesel, Niigata Engineering and Yanmar Diesel) have been working hard on the development of a new marine gas turbine generation called Super Marine Gas Turbine- SMGT. The SMGT has a tendency to become a more widely used unit than low-speed diesel engines of medium and high output. The paper aims at summerising all the advantages of the SMGT compared to low-speed marine diesel engines.
Key words: gas turbine, marine diesel engine
Josip Luzer Preliminary communications
Faculity of Maritime Studies UDK: 629.5 (038) = 111
Studentska 2, Rijeka
Croatia
Nowadays marine
engineering dictionaries either do not exist or do not fully meet the purpose.
On the other hand, it takes a long time to compile them whereas more and more
end users daily need them in their work. The authors of the present English-Croatian
dictionary, whose one entry has been thoroughly described, have jointly decided
to offer the completely elaborated English side of the Dictionary to other nations,
interested to take part in the project.
Presently the dictionary is yet incomplete
and stored in a computer data base. The proposed project involves three phases:
1. translation of the English side of the dictionary into mother tongue, 2.
regular updating of the dictionary, 3. enriching its contents with sketches,
photographs, illustrations and diagrams. The Dictionary contents would be available
either in a hard copy form, a CD or accessed through Internet in a bilingual
or multilingual version..
Key words: gas turbine, marine diesel engine
Mr. sc. Julije Skenderović Review work
Jasminka Bonato UDK: 519.85
Faculity of Maritime Studies 629.5.051.53
Rijeka, Studentska 2
Efficiency in avoiding collisions at sea depends on many parameters. This paper aims at presenting a method by means of which the influence of some of the parameters can be analysed. Some results, obtained by a group of Japanese researchers, of the influence of manoeuvrability and visibility on the ship domain are given too.
Key words: collision avoidance, ship domain, neural networks
Dinko Zorović Review work
Robert Mohović UDK: 656.61.052 (262.3)
Ðani Mohović 551.466 (262.3)
Faculity of Maritime Studies
Rijeka, Studentska 2
It is possible,
with great precision, to measure the height and the periods of the waves on
oceanographic buoys. On various seas of the World these correlations are different
due to many factors, especially the fetch length and the depth of the sea. The
parameters of the waves on the Adriatic Sea are measured, their heights, periods
and speeds are given, and computed are their lengths and speed.
It is, therefore, possible to give
simple empirical mathematical formulas showing the correlation between these
parameters. Based on the measured parameters, it is possible to give the following
equation, which determines the length of the wave as a function of the period:
l = 0,6517 T 2,042. By using this formula, based on the measured wave periods,
it is very easy to calculate the length of the wave on the Adriatic Sea.
Mica Savić Stručni article
Rijeka, Udatnoga 6 UDK: 311: 565.2 (497.5: 497.4)
Croatia
338.47: 656.2 (497.5: 497.4)
Statistical modelling
with the linear impartial evaluation and the least square method are used when
evaluating unknown parameters of classifying the population charasteristics
based on the sampling method. While the linear impartial evaluation can be applied,
with more or less success, by linear dependence only, the least square method
is applied even in cases of non-linear dependence. A special attention is paid
in this paper to the least square method.
The paper aims at presenting the benefits
of the least square method for calculating and describing problems from different
fields in questions which can be expressed as problems evaluating unknown parameters
of classifying characteristics. The application of the least square method is
illustrated with the example of comparing the cargo traffic of the Republic
of Croatia with that of the Republic of Slovenia.
Key words: least square method, linear impartial evalution, railway traffic