The InternationaL TeLecommunication Union, the United Nations speciaLized agency for information and communication technology （ICT）, has Launched a new research initiative to identify emerging and future ICT sector ...The InternationaL TeLecommunication Union, the United Nations speciaLized agency for information and communication technology （ICT）, has Launched a new research initiative to identify emerging and future ICT sector network demands, beyond 2030 and the advances expected of IMT-2020 （SG） systems. This work wiLL be carried out by the newly established ITU Focus Group on TechnoLogies for Network 2030, which is open to all interested parties.展开更多
The introduction of Intelligent and Converged Networks is the latest initiative to emerge from ITU’s burgeoning partnership with Tsinghua University,a partnership grounded in our mutual commitment to strengthening th...The introduction of Intelligent and Converged Networks is the latest initiative to emerge from ITU’s burgeoning partnership with Tsinghua University,a partnership grounded in our mutual commitment to strengthening the bonds between Academia and ITU.展开更多
Ship propulsion performance heavily depends on cavitation,increasing the recent interest in this field to lower ship emissions.Academic research on the effects of cavitation is generally based on the open-water propel...Ship propulsion performance heavily depends on cavitation,increasing the recent interest in this field to lower ship emissions.Academic research on the effects of cavitation is generally based on the open-water propeller performance but the interactions of the cavitating propeller with the ship hull significantly affect the propulsion performance of the ship.In this study,we first investigate the INSEAN E779A propeller by a RANSE-based CFD in open-water conditions.The numerical implementation and the selected grid after sensitivity analysis partially succeeded in modeling the cavitating flow around the propeller.Satisfactory agreement was observed compared to experimental measurements.Then,using the open-water data as input,the propeller’s performance behind a full-scale ship was calculated under self-propulsion conditions.Despite being an undesired incident,we found a rare condition in which cavitation enhances propulsion efficiency.Atσ=1.5;the propeller rotation rate was lower,while the thrust and torque coefficients were higher.展开更多
文摘The InternationaL TeLecommunication Union, the United Nations speciaLized agency for information and communication technology （ICT）, has Launched a new research initiative to identify emerging and future ICT sector network demands, beyond 2030 and the advances expected of IMT-2020 （SG） systems. This work wiLL be carried out by the newly established ITU Focus Group on TechnoLogies for Network 2030, which is open to all interested parties.
文摘The introduction of Intelligent and Converged Networks is the latest initiative to emerge from ITU’s burgeoning partnership with Tsinghua University,a partnership grounded in our mutual commitment to strengthening the bonds between Academia and ITU.
文摘Ship propulsion performance heavily depends on cavitation,increasing the recent interest in this field to lower ship emissions.Academic research on the effects of cavitation is generally based on the open-water propeller performance but the interactions of the cavitating propeller with the ship hull significantly affect the propulsion performance of the ship.In this study,we first investigate the INSEAN E779A propeller by a RANSE-based CFD in open-water conditions.The numerical implementation and the selected grid after sensitivity analysis partially succeeded in modeling the cavitating flow around the propeller.Satisfactory agreement was observed compared to experimental measurements.Then,using the open-water data as input,the propeller’s performance behind a full-scale ship was calculated under self-propulsion conditions.Despite being an undesired incident,we found a rare condition in which cavitation enhances propulsion efficiency.Atσ=1.5;the propeller rotation rate was lower,while the thrust and torque coefficients were higher.
