What is the primary beam response of an interferometer with unequal elements?

The EVN stations encompass elements with a range of diameters, even including an interferometer (the Westerbork Telescope, with up to 14 elements used together as a tied array). In combination, the various station pairs will each produce their own primary beam envelopes, with which the interferometer pattern is modulated. People sometimes forget that in the case of unequal elements, this combined primary beam envelope is different from the beam of each element separately. The reason for this is reviewed, the results for a number of station pairs are summarized, and some of the practical consequences are discussed. The increased interest in wide-field applications, as illustrated by several recent results, underlines the need for a proper determination of the interferometer beam envelope.Comment: 2 pages. no figures. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Editors: R. Bachiller, F. Colomer, J.-F. Desmurs, P. de Vicente (Observatorio Astronomico Nacional), p. 273-274. Needs evn2004.cl

Symplectic reduction of quasi-morphisms and quasi-states

We prove that quasi-morphisms and quasi-states on a closed integral symplectic manifold descend under symplectic reduction to symplectic hyperplane sections. Along the way we show that quasi-morphisms that arise from spectral invariants are the Calabi homomorphism when restricted to Hamiltonians supported on stably displaceable sets.Comment: 20 pages; v2: added remarks and updated references, to appear in Journal of Symplectic Geometr

The evolution of young stellar object disks and their environment

The main efforts were directed towards determining the frequency of disk occurrence and the timescales for disk evolution for solar-type and intermediate mass stars. The results of the investigation showed that optically thick disks are accretion disks. The projected accomplishments are also discussed

The properties and environment of primitive solar nebulae as deduced from observations of solar-type pre-main sequence stars

The following topics were discussed: (1) current observation evidence for the presence of circumstellar disks associated with solar type pre-main sequence (PMS) stars; (2) the properties of such disks; and (3) the disk environment

Asian Varieties of Service Capitalism?

There is currently only limited empirical research and theoretical conceptualisation of the role of knowledge-intensive business services (KIBS) in the economies of Asia within economic geography or elsewhere in the wider social scientific literature. This paper argues that existing theoretical understandings of KIBS are inadequate to conceptualise the nature of ongoing KIBS development in Asian economies – both emerging and mature – and seeks to address this absence by developing a theoretical framework that draws on a range of existing theoretical approaches within and beyond economic geography. To do this, it proposes the concept of ‘service capitalism’, developed from work concerned with varieties of capitalism (VoC), variegated capitalism and advanced service industries. The paper elaborates its theoretical argument by presenting research into two forms of Asian service capitalism through two case studies examining respectively the specific nature of Japanese KIBS and the development of KIBS in China. Using the case studies, it demonstrates how service industry development in both these Asian economies exhibits distinctive characteristics that are a consequence of both local institutional, corporate, and socio-cultural contexts but are also interconnected the wider global economy in complex ways. The paper thus presents a significant and disruptive challenge to existing theories of KIBS development as based on the western experience, and contemporary deployments of the varieties of capitalism and variegated capitalism approaches

Study of abundance analysis of stars in the spectral range B5 through G2 Semiannual progress report, 1 Jun. - 30 Nov. 1969

Research in helium abundance, blue stragglers, and stars in contraction phas

Model atmospheres for RR Lyrae stars

Model atmospheres for RR Lyrae star