Repulsion, induced from quantum vacuum fluctuations, for an anisotropically polarizable atom on the symmetry axis of annular disc is studied. There exists two torsion free points each side disc, where interaction energy orientation independent. The position second points, either shown to determine dependence at distances far plate, revealing a geometrical dependence. In ring limit new repulsion...

The Casimir effect is considered for a wedge with opening angle α, with perfectly conducting walls, when the interior region is filled with an isotropic and nondispersive medium with permittivity ǫ and permeability μ. The electromagnetic energy-momentum tensor in the bulk is calculated, together with the surface stress on the walls. A discussion is given on the possibilities for measuring the i...

Abstract. A data assimilation system for aerosol, based on an ensemble Kalman filter, has been developed the ECHAM – Hamburg Aerosol Model (ECHAM-HAM) global aerosol model and applied to POLarization Directionality of Earth's Reflectances (POLDER)-derived observations optical properties. The advantages this is that ECHAM-HAM modal scheme carries both particle numbers mass which are used in as s...

Abstract A summer polder had developed a deficit in surface elevation of about 20 cm respect to rising sea level during its almost one-hundred-year period embankment. We addressed the questions whether distance restored site intertidal flats and continuation livestock grazing could hamper surface-elevation change first 10 years after de-embankment polder. The showed similar positive linear rela...

The lateral Casimir-Polder force between an atom and a corrugated surface should allow one to study experimentally nontrivial geometrical effects in the electromagnetic quantum vacuum. Here, we derive the theoretical expression of this force in the scattering approach. We show that large corrections to the "proximity force approximation" could be measured using present-day technology with a Bos...

We investigate the stability of magnetically trapped atomic Bose-Einstein condensates and thermal clouds near the transition temperature at small distances 0.5 microm< or =d< or =10 microm from a microfabricated silicon chip. For a 2 microm thick copper film, the trap lifetime is limited by Johnson noise induced currents and falls below 1 s at a distance of 4 microm. A dielectric surface does n...

Abstract. We establish a general relation between dispersion forces. First, based on QED in causal media, leading-order perturbation theory is used to express both the single-atom CasimirPolder and the two-atom van der Waals potentials in terms of the atomic polarizabilities and the Green tensor for the body-assisted electromagnetic field. Endowed with this geometryindependent framework, we the...