From a two-vortex interaction model in atmospheric and oceanic systems, a nonlocal counterpart with shifted parity and delayed time reversal is derived by a simple AB reduction. To obtain some approximate analytic sol...From a two-vortex interaction model in atmospheric and oceanic systems, a nonlocal counterpart with shifted parity and delayed time reversal is derived by a simple AB reduction. To obtain some approximate analytic solutions of this nonlocal system, the multi-scale expansion method is applied to get an AB-Burgers system. Various exact solutions of the AB-Burgers equation, including elliptic periodic waves, kink waves and solitary waves, are obtained and shown graphically.To show the applications of these solutions in describing correlated events, a simple approximate solution for the two-vortex interaction model is given to show two correlated dipole blocking events at two different places. Furthermore, symmetry reduction solutions of the nonlocal AB-Burgers equation are also given by using the standard Lie symmetry method.展开更多
The hydrostatic-pressure-induced transition phase of BaS from the NaCl-type structure （B1） to the CsCl-type structure （B2） is investigated by ab initio plane-wave pseudopotential den-sity functional theory method....The hydrostatic-pressure-induced transition phase of BaS from the NaCl-type structure （B1） to the CsCl-type structure （B2） is investigated by ab initio plane-wave pseudopotential den-sity functional theory method. It is found that the transition pres-sure from B1 to B2 phases is 8.2 GPa according to the usual con-dition of equal enthalpy. Through the quasi-harmonic Debye model,the dependences of the relative volume V/V0 on the pres-sure P,the thermal expansion parameter ratio on pressure P,and the Debye temperature Θ and heat capacity CV on pressure P and temperature T are estimated.展开更多
Aiming at the hysteretic characteristics of classification problem existed in current intemet traffic identification field, this paper investigates the traffic characteristic suitable for the on-line traffic classific...Aiming at the hysteretic characteristics of classification problem existed in current intemet traffic identification field, this paper investigates the traffic characteristic suitable for the on-line traffic classification, such as quality of service （QoS）. By the theoretical analysis and the experimental observation, two characteristics （the ACK-Len ab and ACK-Len ha） were obtained. They are the data volume which first be sent by the communication parties continuously. For these two characteristics only depend on data＇s total length of the first few packets on the flow, network traffic can be classified in the early time when the flow arrived. The experiment based on decision tree C4.5 algorithm, with above 97% accuracy. The result indicated that the characteristics proposed can commendably reflect behavior patterns of the network application, although they are simple.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11405110,11275129,and 11472177)the Natural Science Foundation of Zhejiang Province of China(Grant No.LY18A050001)
文摘From a two-vortex interaction model in atmospheric and oceanic systems, a nonlocal counterpart with shifted parity and delayed time reversal is derived by a simple AB reduction. To obtain some approximate analytic solutions of this nonlocal system, the multi-scale expansion method is applied to get an AB-Burgers system. Various exact solutions of the AB-Burgers equation, including elliptic periodic waves, kink waves and solitary waves, are obtained and shown graphically.To show the applications of these solutions in describing correlated events, a simple approximate solution for the two-vortex interaction model is given to show two correlated dipole blocking events at two different places. Furthermore, symmetry reduction solutions of the nonlocal AB-Burgers equation are also given by using the standard Lie symmetry method.
基金Supported by the Natural Science Foundation of the Education Department of Henan Province of China (2009B590001)the Research Project of Henan Science and Technology Agency of China (092102210314)
文摘The hydrostatic-pressure-induced transition phase of BaS from the NaCl-type structure （B1） to the CsCl-type structure （B2） is investigated by ab initio plane-wave pseudopotential den-sity functional theory method. It is found that the transition pres-sure from B1 to B2 phases is 8.2 GPa according to the usual con-dition of equal enthalpy. Through the quasi-harmonic Debye model,the dependences of the relative volume V/V0 on the pres-sure P,the thermal expansion parameter ratio on pressure P,and the Debye temperature Θ and heat capacity CV on pressure P and temperature T are estimated.
基金supported by the National Natural Science Foundation of China (60903130)
文摘Aiming at the hysteretic characteristics of classification problem existed in current intemet traffic identification field, this paper investigates the traffic characteristic suitable for the on-line traffic classification, such as quality of service （QoS）. By the theoretical analysis and the experimental observation, two characteristics （the ACK-Len ab and ACK-Len ha） were obtained. They are the data volume which first be sent by the communication parties continuously. For these two characteristics only depend on data＇s total length of the first few packets on the flow, network traffic can be classified in the early time when the flow arrived. The experiment based on decision tree C4.5 algorithm, with above 97% accuracy. The result indicated that the characteristics proposed can commendably reflect behavior patterns of the network application, although they are simple.
