Evidence for an increasing 59 s period in the X-ray emission from Geminga

Summary Einstein Observatory and EXOSAT X-ray data from 1E0630+178 reveal a ∼50% periodic emission at ≳59s. This confirms the early SAS-II and COS-B findings on 2CG 195+04 atE>50 MeV and provides the temporal signature for the identification of Geminga. The observations, spanning over a decade (1973–1983), also suggest a very high positive which has become still higher in 1979–1983. The X-ray data used for this work have been collected in part during the Einstein Observatory Guest Observer Program and in part from the EXOSAT mission.     

EFFECT OF COMPOSITION AND PROCESSING CONDITION ON MICROSTRUCTURAL PROPERTIES AND DURABILITY OF FLUOROPOLYMER/ACRYLIC BLENDS

Fluoropolymer blends have been widely used as binders for exterior coatings because of their excellent resistance to ultra-violet (UV) radiation as well as to many corrosive chemical agents.It is known that the fluorinated component usually has a lower glass transition temperature and easily crystallizes in the final structure depending upon the blend composition and sample annealing condition.We investigated the effect of blend composition and annealing process (slow and fast cooling) on the surface mor...     

Decoherence via the dynamical casimir effect

We derive a master equation for a mirror interacting with the vacuum field via radiation pressure. The dynamical Casimir effect leads to decoherence of a superposition state in a time scale that depends on the degree of "macroscopicity" of the state components, and which may be much shorter than the relaxation time scale. Coherent states are selected by the interaction as pointer states.     

A programme for X-ray/optical identification of Soft-γ-ray sources observed by the SIGMA telescope

Summary Anad hoc programme aimed at the search for the optical counterparts of the hard-X-ray/soft-γ-ray sources discovered and/or observed by the SIGMA telescope is described and some of the results, obtained so far, are presented. Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990.