43,891 research outputs found
Study of composites as substrate materials in large space telescopes
Nonmetallic composites such as the graphite/epoxy system were investigated as possible substrates for the primary mirror of the large space telescope. The possible use of fiber reinforced metal matrix composites was reviewed in the literature. Problems arising out of the use of composites as substrate materials such as grinding, polishing, adherence of reflective coatings, rigidity of substrate, hygrospcopici tendency of the composites, thermal and temporal stability and other related problems were examined
Superspace formulation and correlation functions of 3d superconformal field theories
We study SCFTs in the superspace formalism and discuss superfields and
on-shell higher spin current multiplets in free SCFTs with and superconformal symmetry. For 3d SCFTs we
determine the superconformal invariants in superspace needed for constructing
3-point functions of higher spin operators, find the non-linear relations
between the invariants and consequently write down all the independent
invariant structures, both parity even and odd, for various 3-point functions
of higher spin operators.Comment: typos corrected, references added. Accepted for publication in JHE
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