Objective During the sea-level lowstands of the Late Quatemary, paleo-channels resulting from large-scale glacial regressions were extensively developed on continental shelves worldwide. Great attention has been paid...Objective During the sea-level lowstands of the Late Quatemary, paleo-channels resulting from large-scale glacial regressions were extensively developed on continental shelves worldwide. Great attention has been paid to the mechanisms and ages of these successions of fluvial incisions, which provide insight into the sedimentary evolution and processes of shelves.展开更多
Under complex currents, the motion governing equations of marine cables are complex and nonlinear, and the calculations of cable configuration and tension become difficult compared with those under the uniform or simp...Under complex currents, the motion governing equations of marine cables are complex and nonlinear, and the calculations of cable configuration and tension become difficult compared with those under the uniform or simple currents. To obtain the numerical results, the usual Newton-Raphson iteration is often adopted, but its stability depends on the initial guessed solution to the governing equations. To improve the stability of numerical calculation, this paper proposed separated the particle swarm optimization, in which the variables are separated into several groups, and the dimension of search space is reduced to facilitate the particle swarm optimization. Via the separated particle swarm optimization, these governing nonlinear equations can be solved successfully with any initial solution, and the process of numerical calculation is very stable. For the calculations of cable configuration and tension of marine cables under complex currents, the proposed separated swarm particle optimization is more effective than the other particle swarm optimizations.展开更多
Main marine 8, utility （M ＆ U） systems are essential to the routine operation of offshore units, and are extremely important as they are the system that will ensure the basic safety of offshore platforms. This pape...Main marine 8, utility （M ＆ U） systems are essential to the routine operation of offshore units, and are extremely important as they are the system that will ensure the basic safety of offshore platforms. This paper gave a general explanation and guideline of the marine ＆ utility systems in offshore projects including their interface with topside, M ＆ U engineering, equipment sizing operation and control.展开更多
基金funded by the National Natural Science Foundation of China(grant No.41406077)China Geological Survey(grants No.1212011220113,GZH200800501,GZH201400205 and GZH201500203)
文摘Objective During the sea-level lowstands of the Late Quatemary, paleo-channels resulting from large-scale glacial regressions were extensively developed on continental shelves worldwide. Great attention has been paid to the mechanisms and ages of these successions of fluvial incisions, which provide insight into the sedimentary evolution and processes of shelves.
基金supported by the National Natural Science Foundation of China(Grant Nos.51009092 and 51279107)the Scientific Research Foundation of State Education Ministry for the Returned Overseas Chinese Scholars
文摘Under complex currents, the motion governing equations of marine cables are complex and nonlinear, and the calculations of cable configuration and tension become difficult compared with those under the uniform or simple currents. To obtain the numerical results, the usual Newton-Raphson iteration is often adopted, but its stability depends on the initial guessed solution to the governing equations. To improve the stability of numerical calculation, this paper proposed separated the particle swarm optimization, in which the variables are separated into several groups, and the dimension of search space is reduced to facilitate the particle swarm optimization. Via the separated particle swarm optimization, these governing nonlinear equations can be solved successfully with any initial solution, and the process of numerical calculation is very stable. For the calculations of cable configuration and tension of marine cables under complex currents, the proposed separated swarm particle optimization is more effective than the other particle swarm optimizations.
文摘Main marine 8, utility （M ＆ U） systems are essential to the routine operation of offshore units, and are extremely important as they are the system that will ensure the basic safety of offshore platforms. This paper gave a general explanation and guideline of the marine ＆ utility systems in offshore projects including their interface with topside, M ＆ U engineering, equipment sizing operation and control.
