-
Potential long-term effects of limiting CO2 and air pollutant emissions on fuels and technologies on the US electricity sector
AuthorsM Miller ; G Hester
Date published2000
AbstractThis paper comprises some 20 overhead projection slides exploring the potential long-term effects of limiting CO2 and air pollutant emissions on fuels and technologies in the US electricity sector. It is concluded that emission reductions need to be co-ordinated with accelerated development of advanced low-emitting technologies and that an analytic process to evaluate the ability of alternative policies to achieve this be undertaken before policy decisions are finalised.
AuthorsM Miller ; G Hester
Date published2000
-
Study on development trend of materials circulation and comprehensive mode of shipping on Dalian-Yantai line
AuthorsJin Yinyun
Date published2002
AbstractA study of the development trend of materials circulation and comprehensive mode of shipping on the Dalian-Yantai Line is presented. Materials circulating in this area are increasing. Making full use of Dalian-Yantai golden line is a necessary way to enhance the through capacity of materials circulation.
AuthorsJin Yinyun
Date published2002
-
Study on the evaluation of photovoltaic generation system installed on LPG tanker
AuthorsKazuyoshi Sumi
Date published2005
AbstractAlthough small yachts currently used PV (photovoltaic) generation systems the system isn't yet used as a power source by ocean-going vessels. Here a PV generation system installed on a LPG tanker is evaluated. The data was collected and analysed. The data were the PV power the PV energy the electric power of main diesel generator and the position of the vessel from April-December2004
AuthorsKazuyoshi Sumi
Date published2005
-
Wave induced forces on a submarine pipeline
AuthorsF Raichlen ; A Watanabe
Date published1997
AbstractThe wave-induced forces on an underwater sewage outfall were investigated using a laboratory model with the pipeline supported off the bottom on a pedestal faced with rock layers. Velocities were measured around the structure upstream and downstream. The virtual mass coefficient and lift coefficient were studied. The porosity of the rock support structure affected neither the virtual mass nor the lift significantly. The effect of the proximity of the structure to the free surface on the virtual mass coefficient was small but the effect on the lift coefficient was significant.
AuthorsF Raichlen ; A Watanabe
Date published1997
-
On the Dynamical Stability and on the Oscillations of Floating Bodies
AuthorsH. Moseley
Shelf LocationRR7b
AuthorsCatalogue numberH. Moseley
720.221
Shelf LocationRR7b
-
Current forces on a large pier near an existing pier
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
AbstractA new suspension bridge is being built over the Tacoma Narrows Washington. The bridge will be placed on a structure mounted on 2 large concrete caissons which will be exposed to strong currents. The caissons are being built at site while floating and moored in high currents. In order to determine the forces on the caisson due to current a series of scaled physical model tests of one of the caissons was carried out. The forces on the new caisson were measured in the presence of the existing bridge pier and the bottom contours of the Narrows were accurately modeled. The model scale was chosen as 1:100 and the tests were performed for the caisson at different drafts. This paper describes the test setup and measurement system for a series of fixed caisson tests and demonstrates the consistency of the test data. The measured inline drag and transverse lift forces on the fixed caisson at different drafts are presented and the effect of the fluid velocity and flow vorticity on the frequency contents in the forces is discussed. The interaction effect of the neighbouring existing pier on the current forces of the new caisson is investigated. Since the measured forces were applied in the design analysis of the caissons the scaling effect of the model test is also discussed.
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
-
Current forces on a large pier near an existing pier
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
AbstractA new suspension bridge is being built over the Tacoma Narrows Washington. The bridge will be placed on a structure mounted on 2 large concrete caissons which will be exposed to strong currents. The caissons are being built at site while floating and moored in high currents. In order to determine the forces on the caisson due to current a series of scaled physical model tests of one of the caissons was carried out. The forces on the new caisson were measured in the presence of the existing bridge pier and the bottom contours of the Narrows were accurately modeled. The model scale was chosen as 1:100 and the tests were performed for the caisson at different drafts. This paper describes the test setup and measurement system for a series of fixed caisson tests and demonstrates the consistency of the test data. The measured inline drag and transverse lift forces on the fixed caisson at different drafts are presented and the effect of the fluid velocity and flow vorticity on the frequency contents in the forces is discussed. The interaction effect of the neighbouring existing pier on the current forces of the new caisson is investigated. Since the measured forces were applied in the design analysis of the caissons the scaling effect of the model test is also discussed.
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
-
Hydrodynamic wave loading on offshore structures simulated by a two-phase flow model
AuthorsRik Wemmenhove ; Erwin Loots ; Arthur E P Veldman
Date published2005
AbstractDuring violent weather conditions offshore structures are subject to different types of wave impact. The impacting waves are complex mixtures of water and air the properties of the mixture having a serious effect on velocity fields around and pressure levels on offshore structures. The numerical simulation of hydrodynamic wave loading on different types of offshore structures is important to predict forces on and water motion around these structures. A numerical study of two-phase flow over a sloping bottom with the presence of breaking waves is presented. The details of the numerical model an iVOF (improved volume of fluid) method are presented. The program has been developed initially to study the sloshing of liquid fuel in satellites. This micro-gravity environment requires a very accurate and robust description of the free surface. Later the numerical model has been used for calculations of green water loading and the analysis of anti-roll and sloshing tanks including the coupling with ship motions. The model has been extended recently to take two-phase flow effects into account. Two-phase flow effects are particularly important near the free surface where loads on offshore structures strongly depend on the interaction between different phases like air and water. Entrapment of air pockets and entrainment of bubble clouds have a cushioning effect on breaking wave impacts. The velocity field around the interface of air and water being continuous across the free surface requires special attention. By using a newly developed gravity-consistent discretisation spurious velocities at theX40537 Hydrodynamic strength and fatigue foil design
AuthorsRik Wemmenhove ; Erwin Loots ; Arthur E P Veldman
Date published2005
-
On the interaction of pipe lines on the seabed
AuthorsK G Rados
Date published2000
AbstractIn many cases particularly in the development and operation of subsea satellite oil wells more than one pipe is required to be laid along the same path on the seabed. In this case there exists no general technique to evaluate how the stability of each pipe is affected by both the surrounding pipes and the seabed. In this paper two methods are described which have been developed to account for the effects of the seabed and the interaction between the pipes. The first is the 'boundary layer-wake' interaction technique in which the wake due to a uniform inflow velocity field is embedded in a 1/7th power law boundary layer profile. The second is the 'real-imaginary' pipe wake interaction technique in which the effects of the seabed are considered by means of the wake of a mirrored imaginary pipe. For multiple wake interaction modelling a quadratic formula based on energy considerations is used. Preliminary results of these techniques are presented for two patterns of pipe bundles: one in a pyramid shape and the other consisting of pipes lying parallel to each other (flat pack). It is shown that the forces on the pipe all increase with pipe diameter spacing and velocity. It is also noted that the forces on 'flat pack' pipe configurations are less than those developed by a pyramid configuration.
AuthorsK G Rados
Date published2000
-
Dynamic stability and effect of water on deck on small fishing vessels
AuthorsAlberto Francescutto ; Antonio Cardo ; Guilio Russo Krauss
Date published2001
AbstractStarting from the analysis of casualties at sea involving small fishing vessels the results are presented of an experimental study on the capsizing resistance in beam or following steep or high waves. Attention is given to the physical mechanisms leading to capsizing. The experimental results are compared with existing theoretical approaches. The results stress the importance of deck wetness and of the presence of fishing nets as wave trappers on the probability of capsizing.
AuthorsAlberto Francescutto ; Antonio Cardo ; Guilio Russo Krauss
Date published2001
-
On a prediction method of hydrodynamic forces acting on ship hull including the effect of hull form
AuthorsK Kijima ; Y Furukawa ; K Yukawa et al.
Shelf Location213c
AbstractAn attempt is made to predict the hydrodynamic forces acting on ship hull theoretically based on slender body theory. From numerical calculations the present prediction method is found to give good agreement between predicted hydrodynamic forces and experimental results considering the parameter s that expresses distance between separation point and initial position of free vortices shed from the separation point. The formulation and the numerical calculations are discussed.
AuthorsDate publishedK Kijima ; Y Furukawa ; K Yukawa et al.
1996
Shelf Location213c
-
The system-wide impact of technologies for on-line testing of emergency isolation valves
AuthorsD Essam ; K Robinson
Date published2000
AbstractOn-line testing of emergency isolation valves is an emerging technology but it is important to understand the impact such testing can have on safety systems as a whole. Using a variety of risk analysis techniques the varying effects of different on-line testing strategies are demonstrated. Based on the experience of Drallim Industries and liaison with standards bodies various pitfalls are highlighted and strategies for avoiding them are presented.
AuthorsD Essam ; K Robinson
Date published2000
-
Analysis of the dynamical behaviour of an offshore supply vessel with water on deck
AuthorsManuel Laranjinha ; Jeffrey M Falzarano ; Carlos Guedes Soares
Date published2002
AbstractThis paper describes a study of the influence of the water on deck on the dynamical behaviour of an offshore supply vessel with a large open aft deck. The deck under certain load and sea conditions can become partially or totally immersed. This study focuses on the roll motion that can be of large amplitude and therefore has implications and risks for the ship's safety. The Glimm's method is used to model the three-dimensional flow of shallow water on the deck. A parametric study is made in order to show the effect of the relevant parameters. It is shown that the water on deck has a significant influence on the ship's dynamical response.
AuthorsManuel Laranjinha ; Jeffrey M Falzarano ; Carlos Guedes Soares
Date published2002
-
Discussions on the operational aspects of WIG craft at the IMO sub-committee on safety of navigation
AuthorsA I Bogdanov
PublisherInstitute of Marine Engineers (Sydney Branch)
AbstractThe discussion on operational aspects of WIG craft at the 42nd session of the International Maritime Organisation (IMO) sub-committee on safety of navigation held in July 1996 is described. A discussion of ships' routing and related matters working group on an establishment of ways is also recounted. It was concluded that for the prevention of collisions the ekranoplan is similar to the seaplane or nondisplacement craft and no special provisions or amendments to the COLREGs (International Regulations for Preventing Collisions at Sea) are needed. However special provisions for avoidance may be necessary in the future.
AuthorsDate publishedA I Bogdanov
1996
PublisherInstitute of Marine Engineers (Sydney Branch)
-
Experimental investigation on radial loads induced by partial cavitation on liquid oxygen turbopump inducer of the Ariane 5 Vulcain Engine
AuthorsA Zocco ; G Malagnino ; M Motta et al.
Date published1995
AbstractThe main results of the experimental activity carried out on the pump axial stage of the Ariane 5 Vulcain engine liquid oxygen turbopump in partial cavitating condition are presented. Effects of asymmetric cavitation phenomena have been studied with particular attention given to the evaluation of the radial loads arising on the inducer in partial cavitation condition and to the presence of eventual vibrations of the blades. Tests were performed to investigate the influence of flow coefficient rotational speed and water temperature on these asymmetric cavitation phenomena.
AuthorsA Zocco ; G Malagnino ; M Motta et al.
Date published1995
-
Influence of diffusion coatings on the strength of steel 2nd ed
AuthorsG V Karpenko ; V I Pokhmurovskiv ; V B Dalisov et al.
Shelf Location210d
AbstractThe book is based chiefly on investigations carried out at the Physical-Mechanical Institute of the Ukranian Academy of Science and deals with the influence of coatings on the physical and mechanical properties of steel. Great attention has been given to the influence of diffusion impregnation on the ultimate strength, stress-rupture strength and fatigue strength of steel. Residual stresses have also been studied and classified and investigations made on defect annealing by metallizing. The book also contains data on the influence of electrodeposited metals on the mechanical properties of metal articles.
AuthorsPublisherG V Karpenko ; V I Pokhmurovskiv ; V B Dalisov et al.
Freund Publishing
Shelf LocationDate published210d
1979
-
Radial loads and axial thrusts on centrifugal pumps
AuthorsInstitution of Mechanical Engineers (IMechE)
Shelf Location2
AbstractPapers presented at a seminar organised by by the Fluid Machinery Committee of the Power Industries Division of the Institution of Mechanical Engineers, and held at the Institution of Mechanical Engineers on 5 February 1986. Papers are: Review of parameters influencing hydraulic forces on centrifugal impellers; The effect of fluid forces at various operation conditions on the vibrations of vertical turbine pumps; A review of the pump rotor axial equilibrium problem; Dynamic hydraulic loading on a centrifugal pump impeller; Experimental research on axial thrust loads of double suction centrifugal pumps; A comparison of pressure distribution and radial loads on centrifugal pumps; A theoretical and experimental investigation of axial thrusts within a multi-stage centrifugal pump.
AuthorsPublisherInstitution of Mechanical Engineers (IMechE)
London : The Institution of Mechanical Engineers, 1986.
Shelf LocationDate published2
1986
-
RoRo 77 Proceedings- The International Conference on Marine Transport using Roll-on/Roll-off Methods 21-22 June 1977 London
AuthorsRoRo
Shelf Location215f
AbstractInt Conf held in London 21 - 22 June 1977 Papers are A ship operators view and experiences RoRo into West Africa - problems and solutions The Tarros concept for RoRo tonnage - do wheels and cells really go together? Perspectives of the competitive efficiency of Roll on/Roll off Port congestion in the Arabian Peninsular - reasons for and measures taken to overcome including the introduction of RoRo and container services "Seaspeed Arabia" and "Seaspeed Asia" - the largest RoRo ships in service Cost implications of the choice of RoRo equipment Further developments in the LUF system Stowage considerations for large RoRo ships - design and practical aspects The design and use of shipboard ramps The impact of Roll on/Roll off on ports and shipping in developing countries Report of the IAPH sub committee on standardisation of RoRo ramps Instant RoRo - the modular concept using uniflotes and bridging Rationalisation of handling systems for a RoRo terminal - utilisation and suitability
AuthorsPublisherRoRo
BML
Shelf LocationDate published215f
1977
-
The effects of the market concentration in the maritime transport on the strategies of the container terminal operators
AuthorsR Midoro ; F Parola
Date published2002
AbstractThe strategic behaviour of global stevedoring companies over the last few years have been research and results of this research are presented. The investigation focuses in particular on the strategic decisions of the top management of the main container terminal operators. The impact of the strategies of the global terminal operators in the different markets and geographical areas is evaluated highlighting on the one hand the burden of investment assets focusing on the increase in productivity and in terminal capacity and on the other hand on the influence on traffic flows especially with reference to the transhipment terminals. With regard to the main container terminals weaknesses and strengths relating to operating activities and to management problems are underlined. Particular attention is given to the study of the vertical integration of some global carriers along the transport chain.
AuthorsR Midoro ; F Parola
Date published2002
-
The impact of biomedical bleeding on horseshoe crab Limulus polyphemus movement patterns on Cape Cod Massachusetts
AuthorsW Kurz ; M J James-Pirri
Date published2002
Abstractbiomedical bleeding effects Due to observed declines in spawning populations of horseshoe crabs Limulus polyphemus throughout their range conservation measures for this marine invertebrate have increased. Within Cape Cod National Seashore there exist two major threats to the horseshoe crab populations: harvesting as bait for eel and whelk fisheries; and exploitation by the biomedical industry for the production of LAL Limulus ameobocyte lysate. Biomedical companies extract blood from live horseshoe crabs for the production LAL. LAL is used for the detection of endotoxins pathogenic to humans in all injectable drugs and implantable medical devices. All bled horseshoe crabs collected for LAL production must be released within 72 hours of capture. Previous studies on the effects of bleeding on horseshoe crab estimate mortality from 8 % to 15 %. The influence of bleeding on movement patterns and long-term survival are not known. A project is presented which attempts to determine if female horseshoe crabs that have been bled differ in their movement patterns compared to control (unbled) horseshoe crabs.
AuthorsW Kurz ; M J James-Pirri
Date published2002