Now showing items 1-10 of 90
Homoclinic solutions of quasiperiodic Lagrangian systems
(Khayyam Publishing, 1995)
We consider quasiperiodic positive definite Lagrangian systems and establish the existence of one or more solutions homoclinic (namely asymptotic as $t o \pm \infty$) to a quasiperiodic solution. These results are obtained ...
Forced oscillations for singular dynamical systems with an application to the restricted three body problem
We consider forced dynamical systems with two degrees of freedom having singular potentials and we prove existence of infinitely many classical (noncollision) periodic solutions. These solutions have a prescribed rotation ...
Doubly asymptotic trajectories of Lagrangian systems in homogeneous force fields
(Springer Verlag (Germany), 1998)
We study Lagrangian systems with symmetry under the action of a constant generalized force in the direction of the symmetry field. After Routh's reduction, such systems become nonautonomous with Lagrangian quadratic in ...
Homoclinic solutions of almost periodic Hamiltonian systems
(World Scientific, 1998)
Doubly asymptotic trajectories of Lagrangian systems and a problem by Kirchhoff
(European Mathematical Society, 1997)
We consider Lagrangian systems with Lagrange functions which exhibit a quadratic time dependence. We prove the existence of infinitely many solutions tending, as t → ± ∞, to an «equilibrium at infinity». This result is ...
Aufbruch zu neuen Märkten – Vom Markt zum Produkt
(Carl Hanser Verlag, 1998)
Nach Jahren der Rationalisierung besinnt sich die deutsche Wirtschaft nun wieder auf eine ihrer ureigenen Stärken: die Entwicklung innovativer Produkte ! Die Anzahl Patentanmeldungen zeigt, daß der Erfindergeist deutscher ...
A new proposal for urease mechanism based on the crystal structures of the native and inhibited enzyme from Bacillus pasteurii: Why urea hydrolysis costs two nickels
(Elsevier (Cell Press), 1999)
Background: Urease catalyzes the hydrolysis of urea, the final step of organic nitrogen mineralization, using a bimetallic nickel centre. The role of the active site metal ions and amino acid residues has not been elucidated ...