It expatiates on the the kinetic energy of the train and the adhesion in the rail-wheel affecting the emergency brake distance.

Based on the classically elastic theory and the Lennard-Jones potential law,the elastic model of adhesive contact is established to investigate such problems as adhesion,contact and deformation in micro-mechanical systems,and the variations with the gap between two spheres of the adhesive force,deformation and contact radius are obtained.

It considers the cohesion force of filling soil and the adhesive force on interfaces of retaining walls.

For the locomotive under the mine application, the adhesion coefficient reduces greatly due to water or coal mud on the surface of rail.

When the creepage is 0,the adhesion coefficient is about 0.

Simultaneously,a novel model of adhesive contact between a rigid sphere and an elastic plane is established to investigate the adhe- sion problems in micro-and nano-systems,which is capable of obtaining the variations with the distance of the adhesive force,the deformation and the contour of the plane.

In the present paper, the discovery history of condensin, its functions in mitosis and meiosis, relations with cohesin and roles in re.

In eukaryotic cells,its main function,which depends on the proteolytic cleavage of cohesin subunit Scc1,is to hold replicated sister chromatids together until their segregation at anaphase.

Cohesion is established in the S phase, by a phylogenetically conserved multi-protein complex called cohesin, to link newly replicated sister chromatids together until removed from chromosomes in proper time.