The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Jerome P. Sikora - One of the best experts on this subject based on the ideXlab platform.
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Double hull tanker research : Further studies. Discussion
Transactions of the Society of Naval Architects and Marine Engineers, 1995Co-Authors: Jerome P. Sikora, Robert W. Michaelson, D. P. Roseman, R. H. Juers, William M. Melton, M. D. Debbink, A. D. Sandiford, D. Pippenger, J. SirkarAbstract:A research and development program devoted to the Advanced Double Hull concept (a uni-directional, Longitudinal Framing system) has recently been completed at the Carderock Division, Naval Surface Warfare Center). This paper describes a design study of several advanced double hull structural variants of 40,000 DWT product tanker.
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DOUBLE HULL TANKER RESEARCH: FURTHER STUDIES
1995Co-Authors: Jerome P. Sikora, Robert W. MichaelsonAbstract:A research and development program devoted to the Advanced Double Hull (ADH) concept (a uni-directional, Longitudinal Framing system) has recently been completed in the U.S. This paper describes a design study of several ADH structural variants of a 40,000 dwt product tanker. Producibility concerns focused on modular construction of the hull structure and evaluating automated welding techniques. For high block coefficient product tankers, parallel blocks of cells were designed to take advantage of automated welding processes by making separate modules for the inner-bottom and side shells. In addition, several automated and semi-automated welding techniques were evaluated as to their effectiveness for the long straight runs of the double hull cells. Among the welding methods evaluated are: electrogas, electroslag, PAWS, non-vacuum electron beam, and high energy laser. ADH variants of an existing 40,000 dwt product tanker design were designed and compared with the existing conventional double hull structural design. Design considerations included trade-off studies for ease of inspection of cells and cargo tank cleaning versus structural weight. Steel construction cost estimates were made based on material costs, weld lengths, and labour fabrication hours.
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DOUBLE HULL GROUNDING EXPERIMENTS
1995Co-Authors: J L Rodd, Jerome P. SikoraAbstract:A series of large scale double hull grounding experiments have been conducted in the U.S. using the newly constructed grounding test machine (the only one of its kind in the world). This test machine consists of: a 227-tonne test vehicle built on twin railcars to carry each grounding model down an inclined set of railroad tracks to an impact area at 12 knots actual speed; an impact area, which includes a round-tipped steel cone, instrumented for force measurements, mounted to a 2-million point reinforced concrete reaction mass to serve as the gounding "rock". Video and high speed photography are used to trace the detailed failure mechanisms that lead to the rupture of the inner shell of a double hull tanker during grounding incident. The tanker bottom models (ranging in size from 7 x 9 ft to 8 x 24 ft) were developed for two different designs in the 30,000-40,000 dwt range: the baseline double hull (conventional transverse and Longitudinal Framing) and the advanced double hull (ADH: unidirectional cellular structure with no transverse frames). This paper presents the results of the grounding tests and compares them with previously conducted stranding tests. The immediate payoff from these experiments is the expertise gained in the nature of the structural failure mechanisms during stranding and grounding accidents. As a result, this work has inspired the development of a crashworthiness system for ADH tankers. This system has the potential to minimize or eliminate inner shell rupture during the high energy dissipation of a grounding accident. These results are being used to validate numerical analysis tools and to develop design guidelines to minimze oil spill pollution and the associated environmental damage.
Robert W. Michaelson - One of the best experts on this subject based on the ideXlab platform.
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Double hull tanker research : Further studies. Discussion
Transactions of the Society of Naval Architects and Marine Engineers, 1995Co-Authors: Jerome P. Sikora, Robert W. Michaelson, D. P. Roseman, R. H. Juers, William M. Melton, M. D. Debbink, A. D. Sandiford, D. Pippenger, J. SirkarAbstract:A research and development program devoted to the Advanced Double Hull concept (a uni-directional, Longitudinal Framing system) has recently been completed at the Carderock Division, Naval Surface Warfare Center). This paper describes a design study of several advanced double hull structural variants of 40,000 DWT product tanker.
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DOUBLE HULL TANKER RESEARCH: FURTHER STUDIES
1995Co-Authors: Jerome P. Sikora, Robert W. MichaelsonAbstract:A research and development program devoted to the Advanced Double Hull (ADH) concept (a uni-directional, Longitudinal Framing system) has recently been completed in the U.S. This paper describes a design study of several ADH structural variants of a 40,000 dwt product tanker. Producibility concerns focused on modular construction of the hull structure and evaluating automated welding techniques. For high block coefficient product tankers, parallel blocks of cells were designed to take advantage of automated welding processes by making separate modules for the inner-bottom and side shells. In addition, several automated and semi-automated welding techniques were evaluated as to their effectiveness for the long straight runs of the double hull cells. Among the welding methods evaluated are: electrogas, electroslag, PAWS, non-vacuum electron beam, and high energy laser. ADH variants of an existing 40,000 dwt product tanker design were designed and compared with the existing conventional double hull structural design. Design considerations included trade-off studies for ease of inspection of cells and cargo tank cleaning versus structural weight. Steel construction cost estimates were made based on material costs, weld lengths, and labour fabrication hours.
J. Sirkar - One of the best experts on this subject based on the ideXlab platform.
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Double hull tanker research : Further studies. Discussion
Transactions of the Society of Naval Architects and Marine Engineers, 1995Co-Authors: Jerome P. Sikora, Robert W. Michaelson, D. P. Roseman, R. H. Juers, William M. Melton, M. D. Debbink, A. D. Sandiford, D. Pippenger, J. SirkarAbstract:A research and development program devoted to the Advanced Double Hull concept (a uni-directional, Longitudinal Framing system) has recently been completed at the Carderock Division, Naval Surface Warfare Center). This paper describes a design study of several advanced double hull structural variants of 40,000 DWT product tanker.
J L Rodd - One of the best experts on this subject based on the ideXlab platform.
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DOUBLE HULL GROUNDING EXPERIMENTS
1995Co-Authors: J L Rodd, Jerome P. SikoraAbstract:A series of large scale double hull grounding experiments have been conducted in the U.S. using the newly constructed grounding test machine (the only one of its kind in the world). This test machine consists of: a 227-tonne test vehicle built on twin railcars to carry each grounding model down an inclined set of railroad tracks to an impact area at 12 knots actual speed; an impact area, which includes a round-tipped steel cone, instrumented for force measurements, mounted to a 2-million point reinforced concrete reaction mass to serve as the gounding "rock". Video and high speed photography are used to trace the detailed failure mechanisms that lead to the rupture of the inner shell of a double hull tanker during grounding incident. The tanker bottom models (ranging in size from 7 x 9 ft to 8 x 24 ft) were developed for two different designs in the 30,000-40,000 dwt range: the baseline double hull (conventional transverse and Longitudinal Framing) and the advanced double hull (ADH: unidirectional cellular structure with no transverse frames). This paper presents the results of the grounding tests and compares them with previously conducted stranding tests. The immediate payoff from these experiments is the expertise gained in the nature of the structural failure mechanisms during stranding and grounding accidents. As a result, this work has inspired the development of a crashworthiness system for ADH tankers. This system has the potential to minimize or eliminate inner shell rupture during the high energy dissipation of a grounding accident. These results are being used to validate numerical analysis tools and to develop design guidelines to minimze oil spill pollution and the associated environmental damage.
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STRANDING EXPERIMENTS ON DOUBLE HULL TANKER STRUCTURES
1994Co-Authors: J L Rodd, M P Phillips, E D AndersonAbstract:Three different hull designs were evaluated in the 30,000-40,000 ton (27,210,000-36,280,000 kg) range; a baseline conventional double hull bottom with transverse and Longitudinal Framing, an advanced double hull (ADH) with unidirectional Longitudinal web, and a variant of the AH design incorporating curved plates. A large fabricated 'rock' was used to indent each structure vertically, causing first rupture of the outer shell, and then rupture of the inner shell. Inner shell rupture occurred at model loads of up to 750,000 lbs (340.200 kgs), and the rock intrusion into the ship was nearly twice the double hull spacing. The results are proving to be vital in validating numerical modeling tools needed to develop reliable design and analysis methods. In addition, efforts are already underway to develop an ADH crash worthiness system that can minimize or eliminate rupture of the inner shell during the high energy dissipation that occurs during grounding.
Shelley Thompson - One of the best experts on this subject based on the ideXlab platform.
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news about nanotechnology a Longitudinal Framing analysis of newspaper reporting on nanotechnology
2011Co-Authors: Shelley ThompsonAbstract:Governments and businesses around the world have invested billions of pounds in nanotechnology research and development, and more than a thousand consumer products which manufacturers claim to involve nanotechnology are currently on the market. As such, the applications from this emerging field of science and technology have the potential for great impact on individuals and society, making it a recurring subject of news reporting worldwide. Scholars say mainstream news media are the primary places in which citizens learn about science and technology, therefore creating opportunities for democratic debate about these topics. This thesis explores the ways in which nanotechnology is reported in order to understand how journalists strive to make sense of it for their audiences. It analyses 759 articles from two opinion-leading newspapers – The Guardian and The New York Times – in order to address the following research questions: How do journalists frame nanotechnology for their audiences? How do the characteristic features of the Framing processes change over time? And to what extent does the reporting open opportunities for meaningful, democratic discussion around nanotechnology? To answer these questions, the research evaluates literature around the reporting of science and technology, in particular nanotechnology. Using quantitative and qualitative approaches to Framing, this thesis finds the coverage is overwhelmingly positive in its treatment of nanotechnology, suggesting it closely aligns with the business and government interests. Additionally, claims about the potential benefits of nanotechnology are prioritised over risk claims in news articles, with the most common risk and benefit claims being those that are more likely to materialise decades into the future, if ever. Altogether, in failing to discuss applications and potential risks of nanotechnology without drawing on popular culture references limits the opportunity for meaningful, democratic discussion and debate.
