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... LWN.net FAQ . ... Read-copy-update (RCU) is a mutual exclusion technique which can operate without locking most of the time. It can yield significant performance benefits when the data to be protected is accessed via a pointer, is read frequently, changed rarely, and references to the structure are not held while a kernel thread sleeps. The core idea behind RCU is that, when the data requires updating, a pointer to a new structure containing the new data can be stored immediately. ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Hayabusa update . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Next: FITS Checksum Verification Up: Data Models and Previous: A Proposed Convention . ... The FITSIO Subroutine Library has been available for 3 years, and has matured into a stable, full-featured interface for reading and writing FITS format files. ... The FITSIO subroutine library for reading and writing FITS files is now three years old and is used by many projects as the standard programming interface for accessing FITS format data files. ...

... The purpose of these tools is to provide updates to the tables SPIKE used for determining a target's orbital viewing. These parameters come from the SPSS orbit model and must be updated at least once per year depending on the degradation of the HST orbit. The Tool Must: . ... inputs needed are fit_start, fit_end, projection_end (in time), possibly the name of the old constraint file, possibly a parameter to print plots. list_hst_orbit_fits, fit_hst_orbit, fit_orbit1.for in [LRP.TOOLS] . ...

Copies of The Nine Planets are maintained at several dozen different locations around the world in addition to my primary site at SEDS. ... You may find it faster to access one of the mirror sites that's near to you. ... The Nine Planets has been translated into French , Spanish , Italian , Polish , Portuguese , Slovenian, Norwegian , French , Dutch , Danish, German , Chinese, and Japanese . ... This mirror and a Dutch translation of TNP are maintained by Guido Hemeleers . ... Mirrors .. ...

... R-FITS is an R library designed to enable reading in FITS format files into the R environment. ... You must already have R and cfitsio installed. ... To install, first download the tar file that contains all the necessary files to a suitable directory (e.g., /path/to/rfits/installation/directory/ ) and then type cd /path/to/rfits/installation/directory/ gunzip -c rfits.tar.gz | ... rfits_read_image(file,hdu=1) . rfits_read_col(file,col=1,width=1,hdu=2) . rfits_read_key(file,key,hdu=2) . ...

The vertex software has encoder corrections that can be interactively modified via the ocu or lcu interface. ... When adding a correction, the display position includes the correction. Preset mode works fine with the correction (eg. start at 270, add correction=1deg, display reads 271, preset to 270 moves the telescope be 1 degree). I think that program track mode works differently with the offsets.. mainly because we had an offset of 1 degree for 5 months and we could still see sources. ...

... Links . ... Hubble space telescope Hubble's Universe and Skywatch video podcast . ... Astronomy picture of the day . ... Bad Astronomy blog . ESO for science users . ... Check the e-Journal access for ESO-users on the ESO-library page. ... Astronomy & Astrophysics . ... Astronomical Journal . ... Astrophysics and Space Science . Chinese Astronomy and Astrophysics . ... Astrophysics and Space Science Proceedings . New pages in the SciOps wiki (internal, only inside ESO web) Rivi; Sep 2007 ...

... These HTML pages can be downloaded from SET.GMD.DE (/pub/misc/XFree86OS2/html) by FTP. This is XFree86 for OS/2, version 3.3.6 You don't have to download all files; just get the marked required files first, and then read the files and decide what you further need. ... Latest Information required (LATEST.OS2) . ... There are two flavours available, the full server and the small server which does not have the seldomly used PEX, XI, XIE extensions built in. 8514 server, full small (X8514.zip) . ...

... In addition to bug fixes and minor changes too numerous to mention, here is a list of the more significant fixes and enhancements: - The program runs at least 3-4X faster (and more so for certain operations), and now requires 128MB instead of the 256MB previously. ... Except for Tycho- and PGC-only objects, it is possible to label all deep-sky objects, provided the current magnitude limits are set faint enough. ... Multiple labels are no longer simultaneously drawn (less clutter). ...

... Hu ChangSong for his Chinese translation * Ciprian Manea for his Romanian translation * Neil Muller for his suggestions on making bbclone work with register_globals off * Carlos Oliva for his Spanish translation * Vilius Simonaitis for his Lithuanian translation * Chad Schmidt for his numerous corrections * Gregori Arjona for his Catalan translation * Engelbert Gruber for his suggestions on correcting fopenlock() * Josef Pinc for his Czech ...

OptInt PmWiki : Pm Wiki / Upgrades . ... PmWiki is designed to make it easy to upgrade the PmWiki software without affecting your existing data files or installation. For most upgrades, you simply copy the files in the new release over your existing installation. ... See PmWiki:Upgrading From PmWiki 1 for more details. ... For example, if your existing PmWiki installation is in a directory called pmwiki , then one way to copy the new files over the existing ones is to enter the command: . ...

XMM­Newton CCF Release Note XMM­CCF­REL­89 EPIC PN Bad Pixels M Smith September 21, 2001 1 Changes Changes with respect to previous CCFs consist of one additional line being set bad at the read­out end of all CCDs and the implementation of the July 2001 bad pixel table. ... This includes additional bad pixels which constitute a further clean­up of bad pixels caused by the event in revolution 156, and those considered bad after the change of the offset map calculation to ``median correction off ''. ...

... Apache HTTP Server Version 2.2 . ... htpasswd is used to create and update the flat-files used to store usernames and password for basic authentication of HTTP users. ... Resources available from the Apache HTTP server can be restricted to just the users listed in the files created by htpasswd . ... Files managed by htpasswd may contain both types of passwords; some user records may have MD5-encrypted passwords while others in the same file may have passwords encrypted with crypt() . ... Delete user...

... Classes . ... casa::ByteIO . ... Abstract base class for IO on a byte stream. ... Write size bytes to the byte stream. virtual Int . read ( uInt size, void *buf, Bool throwException= True )=0 . Read size bytes from the byte stream. virtual void . ... Get the length of the byte stream. virtual Bool . ... ByteIO is the abstract base class for all classes doing IO on byte streams. ... virtual casa::ByteIO::~ByteIO . ... virtual Int casa::ByteIO::read . ... Read size bytes from the byte stream. ...

Copies of The Nine Planets are maintained at more than 50 different locations around the world in addition to my primary site at SEDS. ... The Nine Planets has been translated into French , Italian , Polish , Portuguese , Slovenian , Norwegian , Dutch , German , Chinese , and Japanese . ... This mirror is maintained by Alan Cairns . ... This mirror is maintained by the site's Webmaster . ... This mirror and a Dutch translation of TNP are maintained by Guido Hemeleers . ... Mirrors .. ...

... 03/26/09 - Chelmsford Historic Society holds a star party. Reading Chronicle article on Reading TV astronomy show. ... Front page picture of Barrows School Star Party from Reading Advocate , February 2, 2006. ... Front page photo in Reading Daily Times Chronicle of star party at Killam School. ... Article on front page of Reading Daily Times Chronicle about star party at Killam School, and the pictures published with it. ... Star Parties . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Class . ... ImageJ Plugin for reading an AVI file into an image stack (one slice per video frame) Version 2008-07-03 by Michael Schmid, based on a plugin by Daniel Marsh and Wayne Rasband Restrictions and Notes: - Only few formats supported: - uncompressed 8 bit with palette (=LUT) - uncompressed 8 16 bit grayscale - uncompressed 24 32 bit RGB (alpha channel ignored) - uncompressed 32 bit AYUV (alpha channel ignored) - various YUV 4:2:2 compressed formats - png or jpeg-encoded individual frames. ...

... This is called disk buffering , and the memory used for the purpose is called the buffer cache . Since memory is, unfortunately, a finite, nay, scarce resource, the buffer cache usually cannot be big enough (it can't hold all the data one ever wants to use). ... On the one hand, data that is written is often soon read again (e.g., a source code file is saved to a file, then read by the compiler), so putting data that is written in the cache is a good idea. ...