Година XCIII, Книжка 6s, 2021Следващ бройАрхивПредишен брой
В броя:
Статии
Статии
SURVEY OF MARITIME STUDENT SATISFACTION: A CASE STUDY ON THE INTERNATIONAL STUDENT SURVEY TO IDENTIFY THE SATISFACTION OF STUDENTS IN MATHEMATICAL COURSES
This study presents the analyses of students' preferences, satisfaction and perception of learning mathematical subjects at higher education maritime institutions in Croatia, Latvia, Estonia and Poland. All these institutions participate as project partners in...
higher maritime education institutions; STEM; learning difficulties; mathematics students learning habits
EVALUATION OF CRUISER TRAFFIC VARIABLES IN SEAPORTS OF THE REPUBLIC OF CROATIA
The paper analyses the data on ship and passenger availability in the busiest ports in the Republic of Croatia. In order to evaluate the variables related to cruiser traffic in seaports in the period from 2015 to 2023 in the Republic of Croatia, it was first n...
cruisers; quantification of variables; cruising; seaports for cruise trips
ADDRESSING MARITIME INDUSTRY FEEDBACK FOR CONTINUOUS IMPROVEMENT: A PROCESS MODEL
Stakeholders’ satisfaction is essential for sustainability. It provides opportunities for learning the strengths and weaknesses of an institution or organization to design and improve the quality of its services to promote goodwill and effective partnerships w...
Maritime university; stakeholders’ satisfaction; industry feedback; process model; industry expectations
COMPARATIVE ANALYSIS OF THE CONTRACTS FOR MARITIME TRANSPORT SERVICES. CHAIN OF CHARTER PARTIES
A basic principle in Law is the freedom of contract. Particularly, in Private Shipping Law, contractual parties may agree on all lawful terms and conditions which are most appropriate for the performance of the carriage. During the years of maritime trade prac...
maritime transport; charter party; liner bill of larding; voyage charter; time charter; bareboat charte; shipowners; disponent owners; carriers; charterers; commercial management; risks
INFLUENCE OF OPTIMISM UPON THE ACCUMULATION OF STRESS, MENTAL STATE AND PERCEIVED RISKS FOR THE FUTURE OF STUDENTS, IN THE CONDITIONS OF COVID–19 PANDEMIC
An empirical psychological study was conducted with students from Nikola Vaptsarov Naval Academy, using both quantitative and qualitative approaches. The aim of the research was to test the role of optimism on the accumulation of stress in the conditions of pa...
optimism; COVID-19 pandemic; social isolation; accumulated stress; mental stat
THE LIGHTSHIP MASS CALCULATION MODEL OF A MERCHANT SHIP BY EMPIRICAL METHODS
Estimating the lightship mass is an important factor in the early stage of ship design given its impact on shipbuilding costs. The mass of the hull and equipment, as well as its distribution, affects the hull strength, deadweight, and stability of the ship. Fu...
Preliminary ship design; database; lightship mass calculation; regression analysis; empirical methods; calibration; merchant ships; bulk carriers; container ships; tankers
IMPACT OF ENGINE ROOM SIMULATOR AS A TOOL FOR TRAINING AND ASSESSING BSMARE STUDENTS' PERFORMANCE IN ENGINE WATCHKEEPING
Ship engine room simulator is a tool used by maritime academies that offer the Marine Engineering Program. According to the Standards of Training Certification and Watchkeeping for Seafarers (STCW), to provide physical realism in training and assessment, simul...
simulators; engine watchkeeping; marine engineering; assessment
THE CHALLENGES OF TEACHING ENGLISH TO THE MARINE ELECTRICAL ENGINEERING STUDENTS
Teaching requirements for Maritime English teachers have been adapting to changes in social and work setting. The changing nature of the learning environment and the growing demand for the ETO (Electro-Technical Officer) at the seafaring market called for the...
Electro-technical officer; blended learning; twinning; marine electrical engineering
ON EDUCATION AND TRAINING IN MARITIME COMMUNICATIONS AND THE GMDSS DURING THE COVID-19
This paper presents the experience of Nikola Vaptsarov Naval Academy (NVNA) teaching staff in providing education and training to students in Maritime communications and the GMDSS during the pandemic crisis. Within a one-year time period including a number of...
maritime education and training; online education; e-learning; simulators
STUDY OF MALARIA CASES AMONG SEAFARERS IN CROATIA AND THE CAUSES OF INEFFECTIVE CHEMOPROPHYLAXIS AMONG THEM
Introduction: Malaria in Croatia was endemic until 1954, when the last autochthonous cases were reported. Now we have imported cases and the disease still most commonly affects seafarers and workers temporarily employed in malaria endemic countries. The aim of...
malaria; seafarers; chemoprophylaxis
AIR POLLUTANT EMISSION MEASUREMENT
One of the main methods for estimating air pollutant emissions from ships is the method developed by Carlo Trozzi, which was later accepted and recommended by the European Environment Agency in its air pollutant emission inventory guidebooks. Consequently, it...
air pollutants estimating; emission; shipping
SWARM OF AUTONOMOUS UNDERWATER VEHICLES – PRELIMINARY RESULTS OF THE CONTROL SYSTEM
A swarm of autonomous underwater vehicles can be a valuable alternative for fully equipped and very expensive super-vehicles. A distributed system of tightly cooperating vehicles can be cheaper, simpler in maintenance, more reliable, more flexible and universa...
swarm; autonomous underwater vehicles; neuro-evolution; neural networks
ASSESSMENT OF LNG BUNKERING ACCIDENTS
The maritime safety is of great concern for the entire maritime community. Ships using LNG for propulsion are already sailing the seas, but the majority of the ports are not yet prepared for this kind of supply. As the process of LNG bunkering is only seemingl...
LNG; bunkering; risk assessment; dispersion; CFD; UDM model
EGR OPERATION INFLUENCE ON THE MARINE ENGINE EFFICIENCY
In the work presented, the focus is on the influence of the EGR operation on the engine performance factors. Basic principles of the EGR operation are considered and experiment with electronically controlled engine is carried out on a Kongsberg marine simulato...
EGR (exhaust gas recirculation); marine engine simulator experiment; EGR basic concept; EGR influence evaluation
THE RELIABILITY OF WATERTIGHT LONGITUDINAL GIRDERS OF FUEL TANKS ON AGING BULK CARRIERS
During the exploitation of bulk carriers, the condition of structural elements and areas depends on the type of the cargo transported, operational conditions and maintenance systems. Corrosion significantly accelerates the aging of metal plates and girders thu...
corrosion; bulk carriers; reliability; wear
THE MEASUREMENT OF EXHAUST GAS EMISSIONS BY TESTO 350 MARITIME – EXHAUST GAS ANALYZER
This paper presents the measurement process of the emissions from marine diesel engines. The emission measurement was carried out by the certified TESTO 350 Maritime exhaust gas analyzer on the Juraj Dalmatinac ferry Caterpillar C32 engines. The gas analyzer r...
emission measurement; exhaust gas analyzer; marine ports; marine diesel engines
IMPLEMENTATION OF A SYSTEMATIC MATERIALS SELECTION METHOD IN THE PRELIMINARY DESIGN OF PROPELLER SHAFTS
The materials selection charts also known as “Ashby” charts are a versatile tool in engineering design. The use of such material property charts is due to technical difficulties in specifying properties during the design of a complex and major component as in...
main propulsion shafting; tensile strength; fatigue strength; dimensioning
PROPELLER LOAD MODELLING IN THE CALCULATIONS OF MARINE SHAFTING TORSIONAL VIBRATIONS
Technical rules of IACS classification societies require that calculations of torsional vibrations for all propulsion shafting systems, as well as for shafting systems of auxiliary machinery above certain power, shall be prepared, submitted and validated for t...
propeller curve; simulation modelling; propulsion system; steadystate dynamic response
MODELING OF THE DEPENDENCE OF CO\(_{2}\) CONTAINED IN THE EXHAUST GASES ON THE AMOUNT OF HYDROGEN GAS SUPPLIED TO THE ENGINE
The idea of this publication is to show how mathematical modeling presents dependence of \(\mathrm{CO}_{2}\) in the exhaust gases. Using quadratic function obtained results are with good approximation. The future below to hydrogen about marine uses. Mathemati...
hydrogen; marine engine; modelling dependence of \(\mathrm{CO}_{2}\) in exhaust gases
TECHNICAL DIAGNOSTICS OF MARINE EQUIPMENT WITH PSEUDO-DISCRETE FEATURES
We present a system for technical diagnostics (TD) that can recognize the actual state of marine equipment. A Bayesian classifier is trained to identify the different classes of a piece of equipment, monitored through multiple pseudodiscrete features. Data lea...
fuzzy-probabilistic merging; pseudo-bayesian parameter estimation; learning information, pattern recognition
CONTRIBUTION TO THE REDUCTION OF THE SHIP’S SWITCHBOARD BY APPLYING SENSOR TECHNOLOGY
The paper discusses the contribution to energy efficiency by reducing the dimensions of the main switchboard (medium voltage or High Voltage - used on ship). Reducing the dimensions of the switchboards can be achieved by reducing the dimensions of the bus bar...
medium voltage switchgear; voltage sensors; ship’s electrical system; energy efficiency rogowski coil sensor
THE STAND FOR FIN DRIVES ENERGY TESTING
The development of recreational diving and the new biomimetic vehicles for civilian and military purposes indicates that fins drives' effectiveness should be a standard research procedure. The different sizes, construction and technical solutions of fin thrust...
fins; efficiency; methodology; test stand
INTRODUCTION OF 3D PRINTING INTO MARINE ELECTRICAL ENGINEERING EDUCATION – A CASE STUDY
The research on 3D printing aboard ships is already under way. The private sector and the navy are both experimenting with its usage. This type of education is however missing in mariner education (e.g. Electrotechnical Officer) and in International Convention...
3d Printing; electrotechnical officer; mariner education; problem based learning; spare parts
MODELING OF THE DEPENDENCE OF THE PRODUCED AMOUNT OF HYDROGEN GAS (Y) ON THE AMPERAGE OF CELL (X) OF A MARINE DIESEL ENGINE SKL 3NVD24
The introduction of new fuels in the field of maritime transport is considered a serious challenge due to the harsh environmental conditions in which the motor ship must operate. Modern marine engines are designed to improve the overall efficiency of the marin...
marine engine; hydrogen; dependence hydrogen gas
SHIPYARD CRANE MODELING METHODS
The article discusses various crane mathematical modelling and simulation methodologies. The purpose of this study is to assess the effect of wind force on the dynamic of shipyard cranes, particularly hook movements in the horizontal plane. Appropriate simulat...
shipyard crane; nonlinear dynamic system; state space; transmittance; Simscape multibody simulation