Journal of Marine Technology and Environment 2016 Vol. 2

The main focus of this article is the development and use of clean renewable energy sources – energy saving devices, on ships. These mechanisms improve the propulsion performance and lower the fuel consumption of the ship using reaction fins for low-speed full ships and stator fins for high-speed slender ships. By using CFD - fluid flow computer program, we analyzed and evaluated the cavity propellers on ships equipped with energy-saving mechanism, including keel and rudder. This helps in understanding the flow characteristics such as pressure distribution on the propeller that would otherwise require many hours of effort and experimental analysis. The result is a high degree of propeller optimization and of the mechanism with the role of energy saving. The main reason of this article is to try to reduce cavitation around the propeller and show a modality for reducing ship pollution, so the quantity of fuel used, that mince, to reduce the price of transportation and it becomes a method of saving money for the ship owners and charters.

The production of oil and gas from offshore oil fields is, nowadays, more and more important. As a result of the increasing demand of oil, and being the shallow water reserves not enough, the industry is pushed forward to develop and exploit more difficult fields in deeper waters. In this paper, there will be deployed the new design code DNV 2012 in terms of checking an offshore pipeline as compliance with the requests of this new construction code, using the Bentley Autopipe V8i. The August 2012 revision of DNV offshore standard, DNV-OS-F101, Submarine Pipeline Systems is supported by AutoPIPE version 9.6. This paper provides a quick walk through for entering input data, analyzing and generating code compliance reports for a model with piping code selected as DNV Offshore 2012. As seen in the present paper, the simulations comprise geometrically complex pipeline subjected to various and variable loading conditions. At the end of the designing process the Engineer has to answer to a simple question: is that pipeline safe or not? The pipeline set as an example, has some sections that are not complying in terms of size and strength with the code DNV 2012 offshore pipelines. Obviously those sections have to be redesigned in a manner to meet the conditions.

The solution of diver’s thermal balance equation in subsea hyperbaric environment was validated by experimental diving with air breathing, in the simulator of Laboratory Hyperbaric Diving Center. They were calculated theoretically end temperatures of divers submerge in heat water (21-22 0C) and cold water (15-17 0C), with equation (1.3). They were measured temperatures of end diving, for each subject, in each scenario diving (depth, water temperature, stationary time, thickness suit, etc.). Theoretically temperatures were compared with those obtained experimentally and the differences between theoretical and real values were 0.1 – 0.5 0C. The mathematical proposed model is valid for diving in hyperbaric environment simulated wet, up to 60 m depth and for air breathing gas unit diving.

This paper presents the floods of the waters on Timis River in compliance with the provisions of the legislation from Romania correlated with that of the European Union modelling in MIKE11 software. Flooding that occurs in the Banat basin is a natural and frequent phenomenon on the water courses in this catchment area, where 1,085 km of the water courses are dammed and there are also numerous hydrotechnical and water management works. Although these works are well made and are intended to protect against floods, a review of these natural phenomena occurring in Banat highlights the fact that over a period of approximately 250 years, major flooding has occurred with a frequency of about once every 30 years, and in some cases these phenomena occur every few years, for example the floods of 2005 which occurred just five years after the floods of 2000. In almost every month in 2005 (February-September), throughout Romania, river water volumes exceeded the capacity that water defences were built to handle. The most important floods in Banat occurred in April. In April 2005 heavy rains were recorded in the Banat region: Oraviţa (226.4 mm), Resia (205.3 mm), Lugoj (201.2 mm), Caransebeş (200.6 mm). These rain falls exceeded reviously recorded maximum monthly levels. This rainfall combined with snow melt – the thickness of snow layers in the mountains at that time exceeded one meter (Ţarcu - 126 cm, Semenic - 26 cm) – led to historically significant flooding from April to September 2005, affecting extensive areas and resulting in casualties and significant property damage. In this paper we present a method of flow modelling (for year 20050) which can use with the same tools for another vulnerable areas.

In this paper we investigate the impact of pollution on the surface water and groundwater. For this, we collect samples from Harbour Tomis Constanta, South Mamaia, Siutghiol Lake, Tabacarie Lake , water from a fountain and water which proves from stink. We analised the physical and chemical parametres of all samples. Finally, the results demonstrated that water samples from areas North Mamaia, Harbour Tomis, Siutghiol Lake, Lake Tabacarie have the values of quality indicators higher that values from Water Pollution Technical Standards. The samples from fountain and from stink are not polluted. So, we can talk about pollution of those waters resulting from the activities undertaken by people of course, because of the attraction of these areas.

The purpose of this paper is to find a solution for route planning in a maritime transport networks, where the costs of tracks, factor of safety and travel time are ambiguous. In this paper author propose a hybrid routing algorithm with Ant Colony Optimization.

Vapor compression technology is used in the majority of space cooling and food refrigeration applications. Refrigerated ships and marine branches, such as merchant, naval, fishing or cruise-shipping are used to transport perishables. This system is running in several situations on R134a, a HFC refrigerant having excellent thermodynamic and thermo-physical properties, but an adverse environmental impact, considering its global warming potential. This paper deals with a theoretical performance study of a vapor compression refrigeration system working with the pure refrigerant R134a and a mixture, R290/R600a (50% / 50%), considering the effect of the main factors that affect the coefficient of performance: interior tube diameters, working pressures and inlet water temperatures. Are highlighted cases in which the performance when using the mixture is higher than the one when using R134a.

Employees with higher job involvement would pay attention to their work. At the same time, it would increase organizational efficient and effective. Therefore, this study analyzed the personality factors and job involvement in container terminal, to determine the personality factors that affected the degree of job involvement. Mann-Whitney U and Kruskal-Wallis tests are used to analyze the data. The results are displayed that education background and job specification are affected the job involvement. The initial output can use in managerial decision making, to assist in organization planning.

For many years, the large amount of sludge generated at the WWTPs in Romania has been of great trouble, raising significant concerns for plants operators. This paper reviews the current situation of sludge production, management, treatment and disposal routes. The continuous development of the wastewater sector and the need to align to the European regulations that state that all settlements with over 2000 inhabitants should have sewerage systems connected to a wastewater treatment plant which includes a sludge processing line, will lead to a great increase in the total amount of sludge generated. The total sludge production in Romania has been growing in the past decade and current studies estimate that by the end of 2018 the total amount will exceed 400000 tonnes. Choosing the most appropriate sludge treatment technology is a key factor in the application of integrated sewage sludge management system. Together with economic and social considerations, sludge managers need to implement more sustainable management systems. Decision makers should combine in an optimum way the alternatives for sewage sludge handling, considering all available information on technical, economic and environmental issues.

The paper presents the results of a very thorough and prolonged activity. Even if results are succinctly presented, by graphics and diagrams, the volume of data behind them is a huge one, detailed in the paper’s informations. In the first stage, starting from a very detailed body plan, the 3D model of the hull was conceived in CAD/CAE - Solidworks. The level of complexity of the model is a very high one, but this one was limited as well by the processing capacity of the calculus system used. In the second stage, the propeller’s maximum force was determined when going astern, by a hydrodynamic analysis and then this force was applied as a percentage on the ship in seven different studies, using loads of 100%, 95%, 90%, 85%, 80%, 60% and 40%. In order to perform these studies the CAE ANSYS12.1 was used. In the end of these studies an interesting conclusion is reached from the scientific point of view finalized by a very useful recommendation for masters.

EU waste policy has evolved over the last 30 years through a series of environmental action plans and a framework of legislation that aims to reduce negative environmental and health impacts and create an energy and resource-efficient economy. The EU’s Sixth Environment Action Programme (2002- 2012) identified waste prevention and management as one of four top priorities. In this paper we will present the implementation of a new integrated municipal waste system in Constanta county. An important feature of the Constanta county, with implications for integrated waste management is represented by the high degree of urbanization: 70% of the county population lives in urban areas, of which over 70% in towns located in the Black Sea area. The overall objective of the system of waste Constanta is developing an integrated, sustainable waste management, by improving waste management based on adequate infrastructure, reducing the number of contaminated sites in the county, mainly aimed at respecting the acquis communautaire of environment and having the effect to grow living environmental and standards in Constanta County.

The use of electronic equipment for navigation is widely considered both necessary and useful. The introduction of electronic charts and ECDIS equipment has substantially reduced the officers’ workload previously burdened by paper chart navigation. The amount of time previously spent for handling and correcting the paper charts during navigational watch gives the dimension of the effort required by the traditional paper navigation. The valuable time saved by the paperless navigation offers the deck officer the possibility to properly lookout, evaluate and assess the situation before making decisions. The advanced technologies offer multiple benefits, through sophisticated functions, used during navigation to greater or lesser extent. These functions are generally regarded as providing assistance for the safety of navigation and therefore their understanding is paramount. Several casualties related to ECDIS navigation have proved that the deck officers over-rely on the electronic equipment. In many cases, these officers failed to analyse and synthetize the information provided by the electronic equipment. This paper aims at advancing factual information relating to ECDIS navigational incidents and analysing their occurrence with regard to ECDIS implementation timetable. The main result of this review is the understanding of human resistance to change, in spite of common openness to using new technologies.