Further Remarks on First-order Infinitesimal Mechanisms

On Infinitesimal Conformal Transformations of the Tangent Bundles with the Generalized Metric

Let  be an n-dimensional Riemannian manifold, and  be its tangent bundle with the lift metric. Then every infinitesimal fiber-preserving conformal transformation  induces an infinitesimal homothetic transformation on .  Furthermore,  the correspondence   gives a homomorphism of the Lie algebra of infinitesimal fiber-preserving conformal transformations on  onto the Lie algebra of infinitesimal ...

Remarks on Modern Track Geometry Maintenance

A short survey on modern track maintenance methods is given, concentrating on the developments in recent years. The ongoing refinement of the machinery should be shown as the influence of IT-solutions. On top the economic view to the track infrastructure is briefly demonstrated. Further developments in track hardware solutions must respect the obtained high level of track work mechanization. H...

Research must look at what interventions work as well as when and why.

This discussion paper is well-written and up to date. A strong feature is its attention to the biological and behavioural mechanisms that connect exposure to certain job characteristics with illness. First, some remarks are made with respect to the definition and measurement of psychosocial risk factors. It is concluded that we do know which factors in work are major risk factors for stress and...

Linear and Nonlinear Mechanisms of Information Propagation

The mechanisms of information transmission are investigated in a lattice of coupled continuous maps, by analyzing the propagation of both finite and infinitesimal disturbances. Two distinct regimes are detected: in the former case, both classes of perturbations spread with the same velocity; in the latter case, finite perturbations propagate faster than infinitesimal ones. The transition betwee...

A Characterization of the Infinitesimal Conformal Transformations on Tangent Bundles