scholarly journals REDUCING SHIP EMISSIONS: A REVIEW OF POTENTIAL PRACTICAL IMPROVEMENTS IN THE PROPULSIVE EFFICIENCY OF FUTURE SHIPS

2021 ◽  
Vol 156 (A2) ◽  
Author(s):  
A F Molland ◽  
S R Turnock ◽  
D A Hudson ◽  
I K A P Utama
Keyword(s):  
Conflicts Of Interest ◽  
Environmental Issues ◽  
Point Of View ◽  
Propulsive Efficiency ◽  
Operational Strategies ◽  
Environmental Requirements ◽  
Hull Forms ◽  
Fuel Costs ◽  
Emission Of Greenhouse Gases ◽  
Propulsive Power

Environmental issues such as the emission of greenhouse gases, pollution, wash and noise are having an increasing impact on the design and operation of ships. These environmental issues together with economic factors, such as rising fuel costs, all ultimately lead to the need to minimise ship propulsive power. Various methods and devices for reducing propulsive power are reviewed and discussed. The most favourable methods, from a feasible and practical point of view, are identified and quantified. It is found that potential reductions in the resistance of existing good hull forms are relatively small, but optimising hull-propeller-rudder interaction offers very promising prospects for improvement. The biggest potential savings in power arise from optimised operational strategies such as the use of optimum trim, speed and weather routeing. Potential conflicts of interest when considering both economic and environmental requirements are investigated and discussed. Suitable design methodologies and procedures, taking into account economic and environmental factors, are suggested for the design of future ships.

scholarly journals Reducing Ship Emissions: A Review of Potential Practical Improvements in the Propulsive Efficiency of Future Ships

2014 ◽  
Vol 156 (A2) ◽  
Keyword(s):  
Conflicts Of Interest ◽  
Environmental Issues ◽  
Point Of View ◽  
Propulsive Efficiency ◽  
Operational Strategies ◽  
Environmental Requirements ◽  
Hull Forms ◽  
Fuel Costs ◽  
Emission Of Greenhouse Gases ◽  
Propulsive Power

Environmental issues such as the emission of greenhouse gases, pollution, wash and noise are having an increasing impact on the design and operation of ships. These environmental issues together with economic factors, such as rising fuel costs, all ultimately lead to the need to minimise ship propulsive power. Various methods and devices for reducing propulsive power are reviewed and discussed. The most favourable methods, from a feasible and practical point of view, are identified and quantified. It is found that potential reductions in the resistance of existing good hull forms are relatively small, but optimising hull-propeller-rudder interaction offers very promising prospects for improvement. The biggest potential savings in power arise from optimised operational strategies such as the use of optimum trim, speed and weather routing. Potential conflicts of interest when considering both economic and environmental requirements are investigated and discussed. Suitable design methodologies and procedures, taking into account economic and environmental factors, are suggested for the design of future ships.

Integrating Environmental Requirements into Vietnamese Sectoral Laws – Roles and Recommendations

2020 ◽  
pp. 1-9
Author(s):  
Mai Thanh Dung ◽  
Nguyen Minh Khoa ◽  
Phan Thi Thu Huong
Keyword(s):  
Sustainable Development ◽  
Law Enforcement ◽  
Environmental Protection ◽  
Legal System ◽  
Environmental Regulations ◽  
Environmental Issues ◽  
Environmental Policies ◽  
Environmental Concerns ◽  
Environmental Requirements ◽  
Environmental Considerations

The need for sustainable development underscores the role and importance of integrating environmental concerns in non-environmental policies because it is evident that environmental regulations only are insufficient to manage all environmental issues. Law enforcement on environmental protection in Vietnam clearly demonstrates this situation. Vietnam’s legal system of environmental protection is incompatible or overlapped with other sectoral laws and in fact many environmental matters have been implemented in accordance with sectoral laws while disregarding environmental considerations due to the lack of specific and explicit environmental provisions or requirements in sectoral laws and regulations. From that situation, the paper emphasizes the need to integrate environmental protection requirements into the sectoral laws of Vietnam and proposes some fundamental criteria and procedures to integrate environmental requirements into sectoral laws.

scholarly journals Comparison Between the Action of Nano-Oxides and Conventional EP Additives in Boundary Lubrication

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 54
Author(s):  
Valdicleide Silva Mello ◽  
Marinalva Ferreira Trajano ◽  
Ana Emilia Diniz Silva Guedes ◽  
Salete Martins Alves
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Friction And Wear ◽  
Film Formation ◽  
Environmental Issues ◽  
Protective Film ◽  
Extreme Pressure ◽  
Extreme Pressure Additives ◽  
Environmental Requirements ◽  
Lubrication Conditions

Additives are essential in lubricant development, improving their performance by the formation of a protective film, thus reducing friction and wear. Some such additives are extreme pressure additives. However, due to environmental issues, their use has been questioned because their composition includes sulfur, chlorine, and phosphorus. Nanoparticles have been demonstrated to be a suitable substitute for those additives. This paper aims to make a comparison of the tribological performance of conventional EP additives and oxides nanoparticles (copper and zinc) under boundary lubrication conditions. The additives (nanoparticles, ZDDP, and sulfur) were added to mineral and synthetic oils. The lubricant tribological properties were analyzed in the tribometer HFRR (high frequency reciprocating rig), and during the test, the friction coefficient and percentual of film formation were measured. The wear was analyzed by scanning electron microscopy. The results showed that the conventional EP additives have a good performance owing to their anti-wear and small friction coefficient in both lubricant bases. The oxides nanoparticles, when used as additives, can reduce the friction more effectively than conventional additives, and displayed similar behavior to the extreme pressure additives. Thus, the oxide nanoparticles are more environmentally suitable, and they can replace EP additives adapting the lubricant to current environmental requirements.

Ship Drag Reduction by Microalgal Biopolymers: A Feasibility Analysis

2007 ◽  
Vol 51 (04) ◽  
pp. 326-337
Author(s):  
K. Gasljevic ◽  
E. F. Matthys
Keyword(s):  
Drag Reduction ◽  
Consumption Rate ◽  
Synthetic Polymers ◽  
Point Of View ◽  
Technical Issues ◽  
Fuel Costs ◽  
Propulsion Power ◽  
Ship Speed ◽  
In Situ Production

We have investigated the feasibility of using high-molecular-weight polysaccharides produced by marine microalgae to reduce the drag on ships and therefore to be able to reduce the needed propulsion power and fuel costs or, alternatively, to increase the ship speed. Experimental and analytical studies were used to answer four critical questions:How suitable are the biopolymers for drag reduction on ships?What is the needed polymer consumption rate at a given level of drag reduction?What is the achievable polymer production rate that can be achieved by the microalgae?What are possible modes of implementation of the proposed technology? It is seen that in situ production of biopolymers by microalgae growing on the hull may be a possible approach to polymeric ship drag reduction. Production of biopolysaccharide off the ship and even harvesting it from the ocean are other possibilities. The use of biopolymers is naturally advantageous from an environmental point of view as well. Some comparison of biopolymers and synthetic polymers is also presented. Several technical issues remain to be investigated, but the information available suggests that biopolymers may be the best additives for drag reduction on ships.

Nuclear, Solar and Desalination Working Together Symbiotically

2016 ◽  
Author(s):  
Hamad Alwashmi ◽  
Jay F. Kunze
Keyword(s):  
Drinking Water ◽  
Greenhouse Gases ◽  
Nuclear Power ◽  
Fossil Fuels ◽  
Energy Systems ◽  
Capital Costs ◽  
The World ◽  
Working Together ◽  
Fuel Costs ◽  
Emission Of Greenhouse Gases

In many parts of the world, drinking water is not available except through desalination. Most of these areas have an abundance of solar energy, with few cloudy periods. Energy is required for desalination and for producing electricity. Traditionally this energy has been supplied by fossil fuels. However, even in those parts of the world that have abundant fossil fuels, using them for these purposes is being discouraged for two reasons: 1) the emission of greenhouse gases from combustion of fossil fuels, and 2) the higher value of fossil fuels when used for transportation. Nuclear power and solar power are both proposed as replacements for fossil fuels in these locations. Both of these energy systems have high capital costs, and negligible fuel costs (zero for solar) Instead of these two primary forms of energy competing, this paper shows how they can compliment each other, especially where a significant part of the electricity demand is used for desalination.

scholarly journals USE OF SLUDGE FROM SANITARY SEWAGE TREATMENT PLANTS (S.T.P) AND THEIR USE AS RAW MATERIAL IN THE MANUFACTURE OF BRICKS

2019 ◽  
Vol 16 (33) ◽  
pp. 823-840
Author(s):  
M. K. TARABAI ◽  
S. G. de AZEVEDO
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Sewage Treatment ◽  
Point Of View ◽  
Test Method ◽  
Raw Material ◽  
Environmental Preservation ◽  
Ceramic Block ◽  
Environmental Requirements ◽  
The One

This paper discusses a possible solution regarding the final disposal of sludge from Sanitary Sewage Treatment Stations (ET), aiming at environmental preservation. The solid waste generated after the wastewater treatment processes is highly contaminating and detrimental to the area in which it is deposited. Given this, the use of sludge with the application of reuse techniques becomes pertinent, both from the economic point of view and from the ecological point of view. By replacing the use of aggregates from mineral deposits, the main clay raw material in the manufacture of ceramic products (Vieira, 2000), by the treated sludge of WWTP we will save on the sources of granular materials. Aiming its reintegration to the production cycle through the introduction of sludge as raw material incorporated in the ceramic mass in the manufacture of hollow bricks, the viability of use was verified through performance analysis, compared to the control brick made of pottery, without the addition of sludge. Specimens were prepared with three types of samples: 90% clay and 10% sludge; 80% clay and 20% sludge; 70% clay and 30% sludge. Mass loss, water absorption index and compressive strength tests were performed. As for the tests, the specimens with 10% and 20% of sludge were the ones that had better adaptation to the technical requirements, but because it is a larger volume of the residue for the application of reuse techniques, the brick with 20% sludge dosage. is the most suitable. NBR7.171, November 1992: Ceramic Block for masonry; Specification NBR 6.461, June 1983: Masonry Ceramic Block - Compressive Strength Check: Test Method; NBR 8.947, November 1992: Ceramic Tile- Determination of Mass and Water Absorption: Test Method. As for the tests, the specimen with 20% of sludge was the one that had the best adaptation to technical and environmental requirements. The present article approaches a possible solution regarding the destination of the sludge coming from Sanitary Sewage Treatment Stations, aiming at environmental preservation. Aiming at its reintegration into the productive cycle through applications of reuse techniques, the sludge became raw material when the ceramic mass was incorporated into the brick fabrication. Three types of samples were elaborated: 90% of clay and 10% of mud; 80% clay and 20% sludge; 70% clay and 30% sludge. As for the tests, the test specimen with 20% of sludge was the one that had more adequacy to the technical and environmental requirements.

scholarly journals Geographic Information System (GIS) and Its Application in Urban Planning and Environment

2014 ◽  
Vol 3 (6) ◽  
pp. 78-85
Author(s):  
Masood Safari Ali Akbari
Keyword(s):  
Urban Planning ◽  
Environmental Issues ◽  
Point Of View ◽  
Land Evaluation ◽  
Rapid Expansion ◽  
Land Uses ◽  
Urban Green Spaces ◽  
New Methods ◽  
Clear Point ◽  
Data Layers

Using satellite data and GIS, the location of various urban land uses, including new methods for locating is quick. This study, based on a method of analysis - descriptive, and benefit from the resources in this area to assess the effectiveness of GIS in urban planning and environment, is discussed, and attempted to make a clear point of view, this can provide. Our results indicate that, nowadays, several researchers, from capabilities of GIS are used for localization. Because GIS is able to analyze large amounts of data layers is. Use of GIS in urban planning, with the rapid expansion of cities and increased levels of SAM binding information that must be processed for urban management, is clear. Abnormal location for the development of suitable sites for the establishment of urban green spaces, places for waste disposal and land evaluation, and its features and many other environmental issues, it can be pointed out.

scholarly journals Premises of Sustainable Development Concept Occurence

2019 ◽  
Vol 24 (1) ◽  
pp. 45-53
Author(s):  
Elisabeta-Emilia Halmaghi ◽  
Mihai-Marcel Neag
Keyword(s):  
Sustainable Development ◽  
Animal Species ◽  
Environmental Changes ◽  
Environmental Issues ◽  
Biodiversity Loss ◽  
Point Of View ◽  
Pesticide Use ◽  
Political Debate ◽  
Toxic Product ◽  
Difficult Issue

Abstract It has long been considered that the environment can withstand all the pressure exerted by human activities on it: extensive agriculture, pesticide use, strong industrialization, noxious gas emissions into the atmosphere, toxic product discharge into lakes, rivers, seas and oceans, massive deforestation to obtain new areas for housing or agriculture. The result was environmental and soil degradation, increased water and/or air pollution, climate change, biodiversity loss, the disappearance of plant and/or animal species, the depletion of some natural resources. These environmental changes have begun to be studied by specialists in the field, who have raised a flag to irreversible environmental changes. The concept of “sustainable development” arose at a time when environmental issues were at the heart of political debate: sustainable development is seen as a complex and difficult issue to solve because there is a diversity of interests of different states. International agreements and cooperation from the point of view of globalization and economic harmonization have also had as their object the issues of sustainable development, by launching the attempt to reconcile the economy with the environment.

Strategically Informed, Environmentally Conscious Information Requirements for Accounting Information Systems

2005 ◽  
Vol 19 (2) ◽  
pp. 79-103 ◽  
Author(s):  
Darrell L. Brown ◽  
Jesse F. Dillard ◽  
R. Scott Marshall
Keyword(s):  
Information Systems ◽  
Management Strategies ◽  
Information Matrix ◽  
Accounting Information ◽  
Environmental Issues ◽  
Environmental Risks ◽  
Environmentally Conscious ◽  
Business World ◽  
Accounting Information Systems ◽  
Environmental Requirements

Accounting information systems (AIS) should provide the information firms need to manage organizational activities. Environmental considerations are increasingly important in the business world, so firms are attending more to environmental risks and activities. AIS must respond to these emerging environmental requirements. We develop an information matrix for identifying alternative management strategies for framing and responding to environmental issues. The proposed matrix provides a tool for identifying the information collected, stored, analyzed, and reported in environmentally attuned accounting information systems.

A Case Study of Mifos Implementation at Asomi

2010 ◽  
pp. 72-91 ◽  
Author(s):  
Puspadhar Das
Keyword(s):  
Open Source ◽  
The State ◽  
Point Of View ◽  
The Other ◽  
Loan Portfolio ◽  
Operational Strategies ◽  
Microfinance Institution

Mifos is an open source enterprise solution for microfinance. This chapter is a practitioner’s point of view on implementation of Mifos in an organization, based on the author’s experience in implementing Mifos at Asomi, a microfinance institution operating in the state of Assam, India. The factors to be considered in selection and implementation of Mifos are discussed. Various inputs, analyses and resources required for implementation are discussed. Any organization must have a concrete set of operational strategies that enables it to track its borrowers and loan portfolio effectively and on time in order to succeed. Wrong assumptions and choice of wrong technology may only aggravate MIS implementation. Development of technology has removed all the barriers to technologies and has enabled organizations to develop computerised systems streamlined to their operational needs and not the other way round. It is attempted to justify this by using the case of Mifos.

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