منابع مشابه
Pierre Auger Observatory: Status Report
The Pierre Auger Observatory is a large international effort to provide measurements of extensive air showers (EAS) initiated in the upper atmosphere by cosmic rays with energies above 10 eV , the Ultra High Energy Cosmic Rays (UHECR’s). The explanations for the origin, acceleration processes and composition of the UHECR’s face theoretical and experimental difficulties, due to the extremely low...
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Over the past 13 years, the Chandra X-ray Observatory’s ability to provide high resolution X-ray images and spectra have established it as one of the most versatile and powerful tools for astrophysical research in the 21 century. Chandra explores the hot, high-energy regions of the universe, observing X-ray sources with fluxes spanning more than 10 orders of magnitude, from the X-ray brightest,...
متن کامل( refereed ) Tony Cook and Christine
The current mechanism for providing affordable housing through the planning system in England is based on negotiation within the framework of Planning Policy Guidance Note 3 and Circular 6/98. In this paper the authors examine three groups of questions. First, on the development of the policy, they look at how the need for affordable housing is assessed, how the policy evolved, and how it is cu...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1967
ISSN: 0004-6256
DOI: 10.1086/110403