Leibniz University of Hanover

About: Leibniz University of Hanover is a education organization based out in Hanover, Niedersachsen, Germany. It is known for research contribution in the topics: Finite element method & Computer science. The organization has 14283 authors who have published 29845 publications receiving 682152 citations.

A large deformation frictional contact formulation using NURBS‐based isogeometric analysis

Abstract: This paper focuses on the application of NURBS-based isogeometric analysis to Coulomb frictional contact problems between deformable bodies, in the context of large deformations. A mortar-based approach is presented to treat the contact constraints, whereby the discretization of the continuum is performed with arbitrary order NURBS, as well as C0-continuous Lagrange polynomial elements for comparison purposes. The numerical examples show that the proposed contact formulation in conjunction with the NURBS discretization delivers accurate and robust predictions. Results of lower quality are obtained from the Lagrange discretization, as well as from a different contact formulation based on the enforcement of the contact constraints at every integration point on the contact surface. Copyright © 2011 John Wiley & Sons, Ltd.

German Consumer Decision‐Making Styles

Abstract: The lack of previous relevant consumer research in Germany, together with the need to test the generalizability of consumer decision-making styles in different countries and with non-student samples, prompted an investigation of German shoppers. The original U.S. eight-factor model could not be confirmed completely, but support was found for six factors: Brand Consciousness, Perfectionism, Recreational/Hedonism, Confused by Overchoice, Impulsiveness, and Novelty-Fashion Consciousness. Variety Seeking was novel to Germany and replaced brand loyalty and price-value consciousness factors found in previous countries. Explanations for the differences are discussed as well as the marketing implications.

Fast atomic transport without vibrational heating

Abstract: We use the dynamical invariants associated with the Hamiltonian of an atom in a one dimensional moving trap to inverse engineer the trap motion and perform fast atomic transport without final vibrational heating. The atom is driven nonadiabatically through a shortcut to the result of adiabatic, slow trap motion. For harmonic potentials this only requires designing appropriate trap trajectories, whereas perfect transport in anharmonic traps may be achieved by applying an extra field to compensate the forces in the rest frame of the trap. The results can be extended to atom stopping or launching. The limitations due to geometrical constraints, energies, and accelerations involved are analyzed along with the relation to previous approaches based on classical trajectories or ``fast-forward'' and ``bang-bang'' methods, which can be integrated in the invariant-based framework.