The work is devoted to the implementation of the hydrodynamic laws to the head-on heavy ion collisions within the energy range 50-100 MeV/A.The hydrodynamic mechanisms of the bubble and ring structures formation are i...The work is devoted to the implementation of the hydrodynamic laws to the head-on heavy ion collisions within the energy range 50-100 MeV/A.The hydrodynamic mechanisms of the bubble and ring structures formation are investigated.It is shown that there is a possible hydrodynamic explanation of the different structures being formed in the case of soft(K=200 MeV) and stiff(K=400 MeV) equations of state.Within the suggested approach the final geometry of the system is defined in the initial stage of the collision and is very dependent on the sound velocity in the nuclear matter.The obtained results are in a good correspondence with the Boltzmann-like transport theory calculations and the experimental data for the selected energy range.展开更多
Based on the primitive equations in polar coordinates and with the supposition that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure agrees with the Fujita form...Based on the primitive equations in polar coordinates and with the supposition that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure agrees with the Fujita formula, a set of equations are derived, which describe the impact of perturbations of central pressure, position of tropical cyclones, direction and velocity of movement of tropical cyclones on the wind field. It is proved that the second order approximation of the kinetic energy of tropical cyclones can be described by the equations under linear approximation. Typhoon Wipha (2007) is selected to verify the above interpretation method, and the results show that the interpretation method of the wind field could give very good results before the landfall of tropical cyclones, while making no apparent improvement after the landfall. The dynamical interpretation method in this paper is applicable to improving the forecasts of the wind field of tropical cyclones close to the coast.展开更多
The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling ...The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br（2P3/2） and Br（2P1/2） atoms from photodissociation of m-bromofluorobenzene have been measured at diff）rent photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via （pre-）dissociation of the two low-lying 1ππ excited states dominate the production process of the ground state Br（2P3/2） atoms. Because of the weak spin-orbit coupling eff）ct among the low-lying triplet and singlet states, the spin-orbit excited Br（2P1/2） atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.展开更多
Here we use a two-layer model to study the dynamics of the intrusion of the Kuroshio onto the continental shelf. Results show that the interaction of the Kuroshio water and shelf water produces a stable upwelling zone...Here we use a two-layer model to study the dynamics of the intrusion of the Kuroshio onto the continental shelf. Results show that the interaction of the Kuroshio water and shelf water produces a stable upwelling zone above 100 m depth northeast of Talwan, which provides a dynamical explanation to the presence of the cold core previously observed by satellite. The affected shelf water from the interaction has an onshore portion, which turns right and becomes a northward alongshore flow when it moves closer to shore. This implies that the Kuroshio water cannot penetrate deep onto the inner part of the continental shelf, but it generates a strong northward jet that is formed mainly by the shelf water.展开更多
基金Supported by National Natural Science Foundation of China(NSFC) projects (Nos.11025524 and 11161130520)National Basic Research Program of China(2010CB832903)Ministry of Education,Science Youth and Sports of Ukraine project(No.M/175-2012)
文摘The work is devoted to the implementation of the hydrodynamic laws to the head-on heavy ion collisions within the energy range 50-100 MeV/A.The hydrodynamic mechanisms of the bubble and ring structures formation are investigated.It is shown that there is a possible hydrodynamic explanation of the different structures being formed in the case of soft(K=200 MeV) and stiff(K=400 MeV) equations of state.Within the suggested approach the final geometry of the system is defined in the initial stage of the collision and is very dependent on the sound velocity in the nuclear matter.The obtained results are in a good correspondence with the Boltzmann-like transport theory calculations and the experimental data for the selected energy range.
基金National Basic Research Program of China (973 Program) (2009CB421505)Major Projects for Science and Technology Development of Zhejiang Province (2007C13G1610002)Natural Science Foundation Project of Zhejiang Province(Y505286)
文摘Based on the primitive equations in polar coordinates and with the supposition that parcel velocity in tropical cyclones is in linear variation and that the distribution of surface pressure agrees with the Fujita formula, a set of equations are derived, which describe the impact of perturbations of central pressure, position of tropical cyclones, direction and velocity of movement of tropical cyclones on the wind field. It is proved that the second order approximation of the kinetic energy of tropical cyclones can be described by the equations under linear approximation. Typhoon Wipha (2007) is selected to verify the above interpretation method, and the results show that the interpretation method of the wind field could give very good results before the landfall of tropical cyclones, while making no apparent improvement after the landfall. The dynamical interpretation method in this paper is applicable to improving the forecasts of the wind field of tropical cyclones close to the coast.
基金financially supported by the National Key R&D Program of China(2017YFA0303502)the National Natural Science Foundation of China(No.21773221 and No.21727804)the Fundamental Research Funds for the Central Universities of China
文摘The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br（2P3/2） and Br（2P1/2） atoms from photodissociation of m-bromofluorobenzene have been measured at diff）rent photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via （pre-）dissociation of the two low-lying 1ππ excited states dominate the production process of the ground state Br（2P3/2） atoms. Because of the weak spin-orbit coupling eff）ct among the low-lying triplet and singlet states, the spin-orbit excited Br（2P1/2） atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.
基金supported by the National Natural Science Foundation of China(Grant No.41076013)the Major State Basic Research Development Program of China(Grant No.2007CB411800)
文摘Here we use a two-layer model to study the dynamics of the intrusion of the Kuroshio onto the continental shelf. Results show that the interaction of the Kuroshio water and shelf water produces a stable upwelling zone above 100 m depth northeast of Talwan, which provides a dynamical explanation to the presence of the cold core previously observed by satellite. The affected shelf water from the interaction has an onshore portion, which turns right and becomes a northward alongshore flow when it moves closer to shore. This implies that the Kuroshio water cannot penetrate deep onto the inner part of the continental shelf, but it generates a strong northward jet that is formed mainly by the shelf water.
