The Experts below are selected from a list of 396 Experts worldwide ranked by ideXlab platform
Ian P. Thompson - One of the best experts on this subject based on the ideXlab platform.
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Island Size and Bacterial Diversity in an Archipelago of Engineering Machines
Environmental microbiology, 2005Co-Authors: Christopher J. Van Der Gast, Andrew K. Lilley, Duane Ager, Ian P. ThompsonAbstract:There is an increasing realization that progress in bacterial ecology can be further advanced by applying theories and models developed in ecology. Consequently, there is a significant need to assess the applicability of such tools, developed specifically for macroorganisms, for investigating the underlying issues that determine bacterial diversity and community assemblage. In this study, we employed the island biogeography species-area model, originally conceived to assess colonization of islands by macroorganisms, to assess bacterial communities colonizing metal-cutting fluids from machines of increasing Sump Tank size, taking these to be analogous to islands of variable size. This system was selected because it is well studied and compared with other natural bacterial communities has a relatively low (manageable) diversity. Our findings show that island biogeography theory holds for the bacterial communities studied, in that smaller Sump Tanks contained lower and putatively less stable diversity, and larger Sumps had greater diversity and were temporally stable. It was found that the calculated power law indices (i.e. z-values) were similar for all sample sets, and strikingly, typical of those observed in classical ecology. This was not expected as bacteria have significant distinguishing features such as huge population sizes, rapid asexual reproduction and small body size that facilitate dispersal, and are particularly resistant to extinction.
Christopher J. Van Der Gast - One of the best experts on this subject based on the ideXlab platform.
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Island Size and Bacterial Diversity in an Archipelago of Engineering Machines
Environmental microbiology, 2005Co-Authors: Christopher J. Van Der Gast, Andrew K. Lilley, Duane Ager, Ian P. ThompsonAbstract:There is an increasing realization that progress in bacterial ecology can be further advanced by applying theories and models developed in ecology. Consequently, there is a significant need to assess the applicability of such tools, developed specifically for macroorganisms, for investigating the underlying issues that determine bacterial diversity and community assemblage. In this study, we employed the island biogeography species-area model, originally conceived to assess colonization of islands by macroorganisms, to assess bacterial communities colonizing metal-cutting fluids from machines of increasing Sump Tank size, taking these to be analogous to islands of variable size. This system was selected because it is well studied and compared with other natural bacterial communities has a relatively low (manageable) diversity. Our findings show that island biogeography theory holds for the bacterial communities studied, in that smaller Sump Tanks contained lower and putatively less stable diversity, and larger Sumps had greater diversity and were temporally stable. It was found that the calculated power law indices (i.e. z-values) were similar for all sample sets, and strikingly, typical of those observed in classical ecology. This was not expected as bacteria have significant distinguishing features such as huge population sizes, rapid asexual reproduction and small body size that facilitate dispersal, and are particularly resistant to extinction.
Juan J Ferrada - One of the best experts on this subject based on the ideXlab platform.
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Drain Tank Information for Developing Design Basis of the Preliminary Design
2012Co-Authors: Juan J FerradaAbstract:Tokamak Cooling Water System (TCWS) drain Tanks (DTs) serve two functions: normal operation and safety operation. Normal DTs are used for regular maintenance operations when draining is necessary. Safety DTs are used to receive the water leaked into the Vacuum Vessel (VV) after an in-vessel loss of coolant accident (LOCA) event. The preliminary design of the DTs shall be based on the information provided by this document. The capacity of the normal DTs is estimated based on the internal volume of in-vessel components [e.g., First Wall/Blanket (FW/BLK) and Divertor (DIV)]; Neutral Beam Injector (NBI) components; and TCWS piping, heat exchangers, electric heaters, pump casing, pressurizers, and valves. Water volumes have been updated based on 2004-design information, changes adopted because of approved Project Change Requests (PCRs), and data verification by US ITER and AREVA Federal Services, the US ITER A and E Company. Two Tanks will store water from normal draining operations of the FW/BLK and DIV Primary Heat Transfer Systems (PHTSs). One Tank will store water from normal draining operations of the NBI PHTS. The capacity of the safety DTs is based on analysis of a design basis accident: a large leak from in-vessel components. There are two safety DTs that will receive water from a VV LOCA event and drainage from the VV, as needed. In addition, there is one Sump Tank for the DIV that will be used for collecting drain water from the draining and drying processes and specifically for draining the DIV system as the DIV cassette lines are at a lower elevation than the DT connection point. Information documented in this report must be refined and verified during the preliminary design of the DTs, and there are several aspects to be considered to complete the preliminary design. Input to these design considerations is discussed in this report and includes, but is not limited to, water inventory; operating procedures/maintenance; Failure Modes and Effects Analysis (FMEA); Tank layout and dimensions, including design margin; classification under French Nuclear Pressure Directives, Equipements Sous Pression Nucleaires (ESPN); and adaptations for construction
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Drain Tank Information for Developing Design Basis of the Preliminary Design
2011Co-Authors: Juan J FerradaAbstract:Tokamak Cooling Water System (TCWS) drain Tanks (DTs) serve two functions: normal operation and safety operation. Normal DTs are used for regular maintenance operations when draining is necessary. Safety DTs are used to receive the water leaked into the Vacuum Vessel (VV) after an in-vessel loss of coolant accident (LOCA) event. The preliminary design of the DTs shall be based on the information provided by this document. The capacity of the normal DTs is estimated based on the internal volume of in-vessel components [e.g., First Wall/Blanket (FW/BLK) and Divertor (DIV)]; Neutral Beam Injector (NBI) components; and TCWS piping, heat exchangers, electric heaters, pump casing, pressurizers, and valves. Water volumes have been updated based on 2004-design information, changes adopted because of approved Project Change Requests (PCRs), and data verification by US ITER and AREVA Federal Services, the US ITER A and E Company. Two Tanks will store water from normal draining operations of the FW/BLK and DIV Primary Heat Transfer Systems (PHTSs). One Tank will store water from normal draining operations of the NBI PHTS. The capacity of the safety DTs is based on analysis of a design basis accident: a large leak from in-vessel components. There are two safety DTsmore » that will receive water from a VV LOCA event and drainage from the VV, as needed. In addition, there is one Sump Tank for the DIV that will be used for collecting drain water from the draining and drying processes and specifically for draining the DIV system as the DIV cassette lines are at a lower elevation than the DT connection point. Information documented in this report must be refined and verified during the preliminary design of the DTs, and there are several aspects to be considered to complete the preliminary design. Input to these design considerations is discussed in this report and includes, but is not limited to, water inventory; operating procedures/maintenance; Failure Modes and Effects Analysis (FMEA); Tank layout and dimensions, including design margin; classification under French Nuclear Pressure Directives, Equipements Sous Pression Nucleaires (ESPN); and adaptations for construction.« less
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Drain Tank Information for Developing Design Basis of the Preliminary Design - R00
2011Co-Authors: Juan J FerradaAbstract:Tokamak Cooling Water System (TCWS) drain Tanks (DTs) serve two functions: normal operation and safety operation. Normal DTs are used for regular maintenance operations when draining is necessary. Safety DTs are used to receive the water leaked into the Vacuum Vessel (VV) after an in-vessel loss of cooling accident (LOCA) event. The preliminary design of the DTs shall be based on the information provided by this document. The capacity of the normal DTs is estimated based on the internal volume of in-vessel components [e.g., First Wall/Blanket (FW/BLK) and Divertor (DIV)], Neutral Beam Injector (NBI) components, and TCWS piping, heat exchangers, electric heaters, pump casing, pressurizers, and valves. Water volumes have been updated based on 2004 design information, changes adopted because of approved Project Change Requests (PCRs), and data verification by U.S. ITER. Two Tanks will store water from normal draining operations of the FW/BLK and DIV Primary Heat Transfer Systems (PHTSs). One Tank will store water from normal draining operations of the NBI PHTS. The capacity of the safety DTs is based on analysis of a design-basis accident:1 a large leak from in-vessel components. There are two safety DTs that will receive water from a VV LOCA event and drainage from the VV, as needed. In addition, there is one Sump Tank for the DIV that will be used for collecting drain water from the draining and drying processes and specifically for draining the DIV system as the DIV cassettes lines are at a lower elevation than the DT connection point. Information documented in this report must be refined and verified during the preliminary design of the DTs, and there are several aspects to be considered to complete the preliminary design. Input to these design considerations is discussed in this report and includes, but is not limited to, water inventory; operating procedures/maintenance; Failure Modes and Effects Analysis (FMEA); Tank layout anddimensions, including design margin; classification under French Nuclear Pressure Directives, Equipements Sous Pression Nucleaires (ESPN); and adaptations for construction
Vibha P. Pode - One of the best experts on this subject based on the ideXlab platform.
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Evaluating Performance of Centrifugal Pump through CFD while Modifying the Suction Side for Easting Discharge
2016Co-Authors: Vibha P. Pode, Prof. S. V. Channapattana, Prof. A. A. BagadeAbstract:Abstract- The conventional suction geometry is not efficient for higher capacity of pump and thus reduced discharge on the delivery side. Intake manifold is being designed for this work. The previous configuration would be studied using CFD techniques while pursuing the objective of arriving at the most efficient geometry for the given application. The marginal increment in the discharge for the Centrifugal Pump tends to depreciate with each marginal rise in capacity the pump; especially for the higher order pumps (25HP and above). The prominence of vortices along with turbulent flow at the regions in the suction pipe affects the flow of water and consequently the discharge. The discharge the `Sump ' is not favorably designed for aiding the intake through the suction pipe. This work would focus on Design alternatives for minimizing the vortices within the suction pipe and enhancing the discharge through possible use manifold at the suction end. Alternatively, efforts would be pursued for addressing the Design of the Sump (Tank) for facilitating the flow of water at the suction end while smoothing out the in pipe. Index Terms- alternative geometry, pressure drop, suction side, performance of pump, flow analysis I
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Assessment for Alternatives of Geometry for the Intake Side of the Sump to Enhance Performance of Centrifugal Pump
International journal of innovative research and development, 2014Co-Authors: Vibha P. Pode, Shylesha ChannapattanaAbstract:"The increment in the discharge for the Centrifugal Pump tends to depreciate with the pump; especially for the higher order pumps (above 25 HP). The turbulence of vortices along with turbulent flow at the regions in the suction pipe affects the flow of water and consequently the discharge. The discharge the `Sump' is not favorably designed for aiding the intake through the suction pipe. This work would focus on Design alternatives for reducing the vortices within the suction pipe and enhancing the discharge through possible use manifold at the suction end. Alternatively, efforts would be pursued for addressing the Design of the Sump (Tank) for facilitating the flow of water at the inlet end while smoothing out the in rush of water at the extreme end of the suction pipe.”
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Evaluating Performance of Centrifugal Pump through CFD while Modifying the Suction Side for Easting Discharge
International Journal of Research in Engineering and Technology, 2014Co-Authors: Vibha P. Pode, Shylesha Channapattana, A. A. BagadeAbstract:The conventional suction geometry is not efficient for higher capacity of pump and thus reduced discharge on the delivery side. Intake manifold is being designed for this work. The previous configuration would be studied using CFD techniques while pursuing the objective of arriving at the most efficient geometry for the given application. The marginal increment in the discharge for the Centrifugal Pump tends to depreciate with each marginal rise in capacity the pump; especially for the higher order pumps (25HP and above). The prominence of vortices along with turbulent flow at the regions in the suction pipe affects the flow of water and consequently the discharge. The discharge theSump' is not favorably designed for aiding the intake through the suction pipe. This work would focus on Design alternatives for minimizing the vortices within the suction pipe and enhancing the discharge through possible use manifold at the suction end. Alternatively, efforts would be pursued for addressing the Design of the Sump (Tank) for facilitating the flow of water at the suction end while smoothing out the in pipe.
David W. Hoeppner - One of the best experts on this subject based on the ideXlab platform.
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Corrosion-Fatigue Properties of Recrystallization Annealed Ti-6A1-4V
Corrosion-Fatigue Technology, 1Co-Authors: Jt Ryder, We Krupp, De Pettit, David W. HoeppnerAbstract:The corrosion-fatigue crack growth properties of recrystallization annealed (RA) Ti-6Al-4V were studied in room-temperature laboratory air, dry air, high-humidity air, Sump-Tank water, and 3.5 percent sodium chloride (NaCI) solution environments. The alloy was characterized by chemical, microstructural, and tensile properties. Corrosion fatigue tests were conducted using wedge-opening-load (WOL), center-cracked-through (CCT) and part-through-cracked (PTC) specimens. Frequency and environmental interactions were studied as well as the effects of orientation and stress ratio. The effect of frequency was to increase the fatigue crack growth rate as the frequency was decreased. A severe effect of frequency was noted in Sump-Tank water and saltwater where at low frequencies, crack growth rates increased to such a high level that failure occurred at K m a x levels significantly below those expected. Fractographic studies showed no apparent cause of this phenomenon.
