Classical Integrable 2-dim Models Inspired by SUSY Quantum Mechanics

A class of integrable 2-dim classical systems with integrals of motion of fourth order in momenta is obtained from the quantum analogues with the help of deformed SUSY algebra. With similar technique a new class of potentials connected with Lax method is found which provides the integrability of corresponding 2-dim hamiltonian systems. In addition, some integrable 2-dim systems with potentials expressed in elliptic functions are explored.Comment: 19 pages, LaTeX, final version to be published in J.Phys.

PROBLEMS OF RAILWAYS, BRIDGES AND TRANSPORT TUNNELS CONSTRUCTION QUALITY IMPROVEMENT

The article deals with new materials and technologies that are used in the construction of railways, including their construction in special climatic conditions in the permafrost, low temperatures and highland. Russian and international experience in railroad construction, in particular, in the mountainous part of the China – Tibet is taken into consideratio