Informetrics:theory,methods and applications records the research contents of informetrics in different periods,reveals the development motivation of"Three Metrics"to"Five Metrics",and is of great ...Informetrics:theory,methods and applications records the research contents of informetrics in different periods,reveals the development motivation of"Three Metrics"to"Five Metrics",and is of great significance to the future trend of informetrics.This article reviews the research and development history of Professor Qiu Junping's team of"Three Metrics"and"Five Metrics",and analyzes and summarizes their academic influence and contribution to the field of international informetrics in combination with the chapter content,innovation,and practicality of the books.It can be seen that Informetrics:theory,methods and applications not only explains the complete research paradigm of informetrics,but also showed to the world the multi-dimensional breakthrough and innovation of Chinese informetrics research,and provided new ideas for the development of international informetrics.展开更多
Viscous flow past a rotating sphere with a constant rotating speed about an axis aligned with the free stream was investigated numerically by solving the three-dimensional Navier-Stokes equations using the finite elem...Viscous flow past a rotating sphere with a constant rotating speed about an axis aligned with the free stream was investigated numerically by solving the three-dimensional Navier-Stokes equations using the finite element method. To elucidate the character of this flow in the near wake, the flow structures at different Reynolds numbers and rotating speeds are examined. The axisymmetric and non-axisymmetric flow structures were observed at Re=200 and 250, respectively, which rotate as a whole around the rotating axis steadily. At Re=300, the vortex shedding appears and the wake becomes more complicated. At low rotating speeds, the flow is dominated by the vortex shedding at higher Reynolds numbers. As the rotating speed increases, the rotating effect gets stronger and the interaction between the rotating action and the vortex shedding results a swirling vortex pattern in the near wake of the sphere.展开更多
Fano resonances in the symmetry-broken gold-SiO2-gold(BGSG)nanotubes and the associated dimers have been investigated based on the finite element method.In the BGSG nanotube,the symmetry breaking induced the interacti...Fano resonances in the symmetry-broken gold-SiO2-gold(BGSG)nanotubes and the associated dimers have been investigated based on the finite element method.In the BGSG nanotube,the symmetry breaking induced the interactions of the inner gold core and outer gold nanoshell plasmons of all multipolar orders and hence the red-shifts of the plasmon resonance modes and the enhanced quadrupole mode peaks were observed.The interference of the quadrupole mode peak with the subradiant dipole mode caused a Fano-dip in the scattering spectrum.By increasing the core offset-value in the BGSG nanotube,the Fano dip with low energy showed a red-shift and became deeper.Unexpectedly the plasmon coupling between a GSG nanotube and a BGSG nanotube can lead to two strong Fano dips in the scattering spectra of the dimer.It was further noted that the thin side of the BGSG nanotube located at two sides of the dimer gap can lead to the strong near-field coupling between two BGSG nanotubes and hence a deeper and broader Fano dip.展开更多
文摘Informetrics:theory,methods and applications records the research contents of informetrics in different periods,reveals the development motivation of"Three Metrics"to"Five Metrics",and is of great significance to the future trend of informetrics.This article reviews the research and development history of Professor Qiu Junping's team of"Three Metrics"and"Five Metrics",and analyzes and summarizes their academic influence and contribution to the field of international informetrics in combination with the chapter content,innovation,and practicality of the books.It can be seen that Informetrics:theory,methods and applications not only explains the complete research paradigm of informetrics,but also showed to the world the multi-dimensional breakthrough and innovation of Chinese informetrics research,and provided new ideas for the development of international informetrics.
文摘Viscous flow past a rotating sphere with a constant rotating speed about an axis aligned with the free stream was investigated numerically by solving the three-dimensional Navier-Stokes equations using the finite element method. To elucidate the character of this flow in the near wake, the flow structures at different Reynolds numbers and rotating speeds are examined. The axisymmetric and non-axisymmetric flow structures were observed at Re=200 and 250, respectively, which rotate as a whole around the rotating axis steadily. At Re=300, the vortex shedding appears and the wake becomes more complicated. At low rotating speeds, the flow is dominated by the vortex shedding at higher Reynolds numbers. As the rotating speed increases, the rotating effect gets stronger and the interaction between the rotating action and the vortex shedding results a swirling vortex pattern in the near wake of the sphere.
基金supported by the National Basic Research Program of China(Grant No.2012CB921504)the National Natural Science Foundation of China(Grant Nos.11174113,11204129 and 11274171)+1 种基金the Research Fund for the Doctoral Program of Higher Education of China(RFDP)(Grant Nos.20120091110001 and 20130091130004)Qing Lan Project of Jiangsu Province
文摘Fano resonances in the symmetry-broken gold-SiO2-gold(BGSG)nanotubes and the associated dimers have been investigated based on the finite element method.In the BGSG nanotube,the symmetry breaking induced the interactions of the inner gold core and outer gold nanoshell plasmons of all multipolar orders and hence the red-shifts of the plasmon resonance modes and the enhanced quadrupole mode peaks were observed.The interference of the quadrupole mode peak with the subradiant dipole mode caused a Fano-dip in the scattering spectrum.By increasing the core offset-value in the BGSG nanotube,the Fano dip with low energy showed a red-shift and became deeper.Unexpectedly the plasmon coupling between a GSG nanotube and a BGSG nanotube can lead to two strong Fano dips in the scattering spectra of the dimer.It was further noted that the thin side of the BGSG nanotube located at two sides of the dimer gap can lead to the strong near-field coupling between two BGSG nanotubes and hence a deeper and broader Fano dip.
