32 research outputs found
Técnicas cualitativas para el control de calidad del agua
A la cabeza del tÃtulo: Taller regional sobre control y calidad del agu
On the redshift dependence of scintillating AGN: results of the MASIV Survey and follow-up observations
Interstellar scintillation, AGN physics and the SKA
A large fraction of compact, extragalactic radio sources exhibit rapid variability at centimetre wavelengths as their radio emission is scattered by electron density fluctuations in the interstellar medium of the Galaxy. Next-generation wide-field radio telescopes will have to account for this in forming deep images of the radio sky. Interstellar scintillation offers a unique probe of very small-scale structure in both the ionized interstellar medium and the compact jets of the radio sources themselves. The effective resolution is two orders of magnitude higher than achievable with very long baseline interferometry. The recent Micro-Arcsecond Scintillation-Induced Variability Survey revealed a reduction in ISS at 4.9 GHz with increasing source redshift, implying either an increase in the apparent angular size of high-redshift radio cores beyond that expected due to a cosmological decrease in brightness, or a decrease in the microarcsecond-scale core dominance towards high redshift. The result could be due either to source-intrinsic evolution in the selected sample, or to scatter-broadening in the intergalactic medium
Suggested microbiological water quality tests for developing countries and rural and isolated North American communities
Developing a self-sustained microbiological water quality testing capability in a remote aboriginal community
The table of contents for this item can be shared with the requester. The requester may then choose one chapter, up to 10% of the item, as per the Fair Dealing provision of the Canadian Copyright Ac
Use of simple, inexpensive microbial water quality tests : results of a three continent, eight country research project
Assessment of the efficiency of drinking water treatment using the coliphage, total coliform and H2S paper strip tests
North and South American studies on the potential of coliphage as a water quality indicator
Related to, but not direct output of IDRC project 85-000