Abstract In this paper, a dynamic interaction model of the coupled system railway bridge, foundation, subsoil, ballast, track, and high-speed train is presented, with special emphasis on longitudinal between track bridge structure, taking into account flexibility ballast. After description system, equations motion are given separately for each subsystem. The discretization bedded rails performe...

A high-resolution cryo-EM structure of kinesin bound to its microtubule track allows for near-atomistic visualization of nucleotide-dependent conformational changes in this motor protein.

The SchwartzReport tracks emerging trends that will affect the world, particularly the United States. For EXPLORE it focuses on matters of health in the broadest sense of that term, including medical issues, changes in the biosphere, technology, and policy considerations, all of which will shape our culture and our lives.

In Egypt, girls have traditionally been educationally disadvantaged. This disadvantage, however, has been focused on the failure to enter school. Increasingly it is recognized that girls who ever-enroll are at least as likely to complete primary and secondary education as boys. Still the belief persists that girls, especially those from poor families, will be disadvantaged in terms of school ex...