Astronomical & Astrophysical Transactions The Journal of the Eurasian Astronomical Society Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713453505 Flux density evolution of the sources 3C273, 3C279 and 3C454.3 at the frequencies 102 MHz-36.8 GHz A. E. Volvach a; L. N. Volvach a; M. G. Larionov b; H. D. Aller...

TheUSVirtual Astronomical Observatorywas a software infrastructure anddevelopment project designed both to begin the establishment of an operational Virtual Observatory (VO) and to provide the US coordination with the international VO effort. The concept of the VO is to provide the means by which an astronomer is able to discover, access, and process data seamlessly, regardless of its physical ...

Errors in the planetary coordinates of the Astronomical Almanac are approximated by comparing their fundamental ephemerides, upon which they are based, with a more recent ephemeris. JPL’s DE200 provided the fundamental planetary and lunar ephemerides of the Astronomical Almanac for the years, 1984–2002, and DE405 has replaced DE200 in that role, starting in 2003. Recently, new observational mea...

A DIRECTOR OF A UNIVERSITY LffiRARY has many problems. Besides financial problems, he must decide how to build collections, what resources in the collections can best serve faculty and students, what kind of bibliographical control must be provided, how to cope with the growth of collections and building problems that ensue, how to make more effective public services, how to provide instruction...

This paper gives a compilation of physical mechanisms producing red-shifts of astronomical objects. Over sixty proposed mechanisms are listed here for the purpose of quantitative comparisons. These mechanisms may not individually account for all observations but are adapted to particular situations such as the solar limb redshift, the red-shift of quasars or the cosmological red-shift. However,...

Multiresolution transforms, including a wavelet transform, are applied to image visualization, image restoration, filtering and compression, and object detection. Variance stabilization is used, when appropriate, to cater for common astronomical image noise models. We discuss validation of such methods in the case of astronomical image processing. A range of examples illustrate the effectivenes...

Virtually all of our knowledge of astronomical objects was gained by observation of their light. We know how to make many kinds of detailed measurements on light, among them brightness, spectrum, polarization state, degree of coherence, and the shape of light-emitting regions. We also know a great deal about the mechanisms by which light can be produced in nature, and we can thus use any accura...

Photos have been commonly used in our society to convey information, and the associated contextual information (i.e., the capture time and location) is a key part of what a photo conveys. However, the contextual information can be easily tampered or falsely claimed by forgers to achieve malicious goals, e.g., creating fear among the general public or distorting public opinions. Thus, this paper...

Application functionality in business-to-business marketplaces today covers a smaller range of a company's overall procurement activities. Not every product or service can be acquired using catalogs, auctions or tenders. With the growing number of market transactions to be supported electronically, we expect a range of applications that will handle other forms of transactions. We hold that to a...