Hide Zen home . ... SAI RVO . ... This web page is dedicated to WAL of PostgreSQL. WAL is a Write-Ahead Log used to save transaction information and checkpoints ahead of actual sync of the data to disk. This enables ACID and allows to recover data in the event of crash. SiteMap Changes HowTo 2016-04-11 2016-04-10 Blog . 0 Comments on WAL This page is read-only View other revisions Administration . Last edited 2003-08-25 21:23 UTC by mg.cs.concordia.ca (diff) . ... Zen, 2003-2007 ...
... He was alive 400 years ago to be able to see the youngest supernova in the Milky Way that has been seen from Earth. Amazingly, he was able to see the Kepler supernova without the aid of a telescope. ... The explosion is referred to as a supernova and the light that it gives off can be brighter than the light given off by an entire galaxy. It will look like an extremely bright star and can be seen with the naked eye for many days and sometimes months after it starts. ...
... Astronomers at the US DOE?s Berkeley Lab have found the most distant Type 1a supernova ever. б SN SCP-0401 is roughly 10 billion light-years away from Earth. б That means the supernova happened 10 billion years ago. б Given that Big Bang theory estimates the universe being created roughly 13.77 billion years ago, the discovery of SN SCP-0401 is particularly exciting. ... Just like all living things stars have a life cycle. ...
... Cassiopeia A has been famous for being the youngest supernova remnant in the Milky Way for a long time. That changed in 2008 with the discovery of G1.9+0.3 by Stephen Reynolds at North Carolina State University. G1.9+0.3 is estimated to be 140 years old where as Cassiopeia A is estimated to be about 340 years old. б G1.9+0.3 is estimated to be roughly 26,000 light-years away whereas Cassiopeia A is around 11,000 light-years away. ...
... It?s official. б NASA?s Fermi Gamma-ray Space Telescope has found evidence that supernova remnants speed up cosmic rays to extremely high speeds. ... Amazingly, physicist Enrico Fermi postulated in 1949 that high speed cosmic rays were sped up in the magnetic fields of interstellar gas clouds. б Since then, scientists have focused on supernova remnants as a possible candidate for this process. Over 60 years later, the Fermi Gamma-ray Space Telescope has proven Enrico Fermi?s thinking to be true. ...
... Meet G1.9+0.3, the youngest supernova in the Milky Way that has ever been found. б This image б is a combination of a radio image from the NRAO?s VLA taken in 1985 and an x-ray image taken from NASA?s Chandra X-ray telescope taken in 2007. ... G1.9 +0.3 is approximately 25,000 light-years away from Earth. б At 140 years old, it should probably hold the title of youngest supernova in our galaxy for quite a long time. Just like all living things stars have a life cycle. ...
... Prefered term (PT) - is the term selected among synonyms to be the one used for indexing and retrieval purposes. ... TZ uses subdictionary (should be defined in tsearch2 configuration) to normalize thesaurus text. ... For example, consider thesaurus (with simple subdictionary) rules with pattern 'swsw' ('s' designates stop-word and 'w' - known word): a one the two : swsw the one a two : swsw2 . ... Dictionary="en_stem" defines dictionary (snowball english stemmer) to use for thesaurus normalization....
Hide Zen home . ... SAI RVO . SAI CAS . ... headline() produces text fragments with query terms to help users identify search results. It's tempting to use extents , which we already use to compute ranks . Get extents . ... Choose 2-3 extents . We want headline to be informative, so extents should be dense ( more query terms in shorter text) and dispersed (more different query terms). ... 0 Comments on ExtentsBasedHeadline This page is read-only View other revisions Administration . ...