Study On The Stokes Efficiency Of The Brown Ratchet Driven By AC Driving Force

In the past few decades,the study of directional transport of biomolecular motors in the body of life has aroused great interest of scholars.Numbers of motor proteins exist in life body,and these types of motors have been complex.These molecular motors can transport material to a specified position of cell.There are also lots of molecular motors that play the role of information transmission.The study of the molecular motor attracts a great deal of attention due to its high efficiency.The characteristic of the molecular motor has great advantages in the transmission of genetic material and transmembrane transport.Typically,molecular motor can be simulated as a brown particle in a moving environmentmole according to the size of a molecular motors.Consenquently,different models are proposed by people to explore the properties of biomolecular motors.The optimal condition for directional transport can be found and the energy imputed to the system can be improved by studying the mechanism of producing directional motion.According to the mechanism of the transport environment,a particular ratchet model was discussed.The problem of directional transport and Stokes efficiency of a molecular motor under a simple harmonic force was discussed in this paper.Furthermore,the influence on the directional transport of the ratchet of the spatial asymmetry,the amplitude of external bias force,the height of external potential and the intensity of the thermal noise has been analyzed deeply.Results show that the brown particles can produce a reverse probability.Meanwhile,the inverse probability flow of brown particles can reach the strongest point under suitable spatial asymmetry,and the particle flow capacity of brown particles can be improved when the external bias force amplitude take a suitable value.Moreover,it is found that the Stokes efficiency of brown ratchet can be improved under the proper barrier height,and the performance of brown particles to overcome the viscous resistance and the directional transport hace been enhanced.Therefore,different types of ratchets to enhance the directional transport of particles can be designed according to the results of this study,and the transport efficiency of brown particles can be improved.In addition,a theoretical basis for medical drug delivery can also provided and nanoscale device control can be researched.