The molecular dynamics simulations are performed to show that in aque- ous environments, a short single-walled carbon nanotube (SWCNT) guided by a long SWCNT, either inside or outside the longer tube, is capable of ...The molecular dynamics simulations are performed to show that in aque- ous environments, a short single-walled carbon nanotube (SWCNT) guided by a long SWCNT, either inside or outside the longer tube, is capable of moving along the nanotube axis unidirectionally in an electric field perpendicular to the carbon nanotube (CNT) axis with the linear gradient. The design suggests a new way of molecule transportation or mass delivery. To reveal the mechanism behind this phenomenon, the free energy profiles of the system are calculated by the method of the potential of mean force (PMF).展开更多
The time evolution of both proton and anti-proton v2 flows from Au+Au collisions at √SNN=7.7 GeV are examined by using both pure cascade and mean-field potential versions of the UrQMD model. Due to a stronger repuls...The time evolution of both proton and anti-proton v2 flows from Au+Au collisions at √SNN=7.7 GeV are examined by using both pure cascade and mean-field potential versions of the UrQMD model. Due to a stronger repulsion at the early stage introduced by the repulsive potentials and hence much less annihilation probabilities, anti-protons are frozen out earlier with smaller v2 values. Therefore, the experimental data of anti-proton v2 as well as the flow difference between proton and anti-proton can be reasonably described with the potential version of UrQMD.展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.11372175 and 11272197)the Research Fund for the Doctoral Program of Higher Education of China(No.20103108110004)the Innovation Program of Shanghai Municipality Education Commission(No.14ZZ095)
文摘The molecular dynamics simulations are performed to show that in aque- ous environments, a short single-walled carbon nanotube (SWCNT) guided by a long SWCNT, either inside or outside the longer tube, is capable of moving along the nanotube axis unidirectionally in an electric field perpendicular to the carbon nanotube (CNT) axis with the linear gradient. The design suggests a new way of molecule transportation or mass delivery. To reveal the mechanism behind this phenomenon, the free energy profiles of the system are calculated by the method of the potential of mean force (PMF).
基金the National Natural Science Foundation of China(Grant Nos.1137506211547312,and 11275068)the project sponsored by SRF for ROCS,SEM,and the Doctoral Scientific Research Foundation(Grant No.11447109)
文摘The time evolution of both proton and anti-proton v2 flows from Au+Au collisions at √SNN=7.7 GeV are examined by using both pure cascade and mean-field potential versions of the UrQMD model. Due to a stronger repulsion at the early stage introduced by the repulsive potentials and hence much less annihilation probabilities, anti-protons are frozen out earlier with smaller v2 values. Therefore, the experimental data of anti-proton v2 as well as the flow difference between proton and anti-proton can be reasonably described with the potential version of UrQMD.