Fourier Transforms Tutorial Narrabri Synthesis Workshop Sep 2001 In this tutorial I am hoping to show you four essential properties of the Fourier plane, as it relates to interferometry. ... Why phase matters Roughly speaking, phase in the Fourier plane relates to location in the image plane. ... Now zero the phase and back-transform: unix% maths exp="<gauss_w10_o30.pf>*0" out=zerophase.pf unix% maths exp="<gauss_w10_o30.af>*1" out=zerophase.af unix% backward zerophase Now look at the .rb image. ...

. You can use the diff command to compare the contents of two directories: diff directory1 directory2 . The information given by the command tells you what to do to make the directories match. If there is no difference between the directories you are returned to the shell prompt . diff reports if a file or directory is only to be found in directory1 or directory2 . It also reports any line by line differences for files that are common to each directory. Example .

... This program was created for correlating chosen regions in the series of fts images. ... Chosen regions' . ... In this section the program counts the integral for each region of the grid for each image. ... As a matter of fact, the integral is total brightness of the region and it is counted by 'int_tabulated' IDL function. ... In addition, the program will show the count of the regions which correlate with the corresponding region (the brighter region means the bigger count) and its contour. ...

... At SAO, the ROSAT data for observation rp123456 will be in /data/rdata/godata/rp123456/ . The PROS package contains sample ROSAT and Einstein data which are in the directory /pros/xray/data which is loaded with the IRAF task ``xray''. ... Thus within an arbitrary working directory and within the IRAF environment, to look at an image the command is, tv> display "xdata$rp110590_im2" 1 If Einstein data are loaded at SAO they will appear in the directory /pool14/i1234/ . ...

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

Next: The /dev directory Up: The root filesystem Previous: The root filesystem . The /etc љ directory contains a lot of files. ... See the chapter on init љ for further information. /etc/passwd љ . ... Lists the filesystems mounted automatically at startup by the mount -a command (in /etc/rc љ or equivalent startup file). ... etc/issue љ . ... See the magic љ and file љ manual pages for more information. /etc/motd љ . ... Files executed at login or startup time by the Bourne or C shells. ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . Directory of astronomy web sites. ... Listed Since October 25, 2004 . ... Web Site . http://123world.com/astronomy/index.html . ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

The sections <Directory> , <Location> and <Files> can contain directives which only apply to specified directories, URLs or files respectively. Also htaccess files can be used inside a directory to apply directives to that directory. ... The order of merging is: . ... If multiple <Directory> sections apply to the same directory they are processed in the configuration file order. ... Using the options in question is only possible inside a <Directory> section (or a .htaccess file). ...

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 > Modules . ... To enable mod_dav , add the following to a container in your httpd.conf file: Dav On . ... In addition, a location for the DAV lock database must be specified in the global section of your httpd.conf file using the DavLockDB directive: DavLockDB /usr/local/apache2/var/DavLock . ... Use the Dav directive to enable the WebDAV HTTP methods for the given container: <Location /foo> Dav On </Location> . ...

... Starbirth in NGC 1808 . ... The center of galaxy NGC 1808 is bursting with new stars, but why? Being a barred spiral galaxy makes NGC 1808 somewhat similar to our own Milky Way Galaxy. But the disk of NGC 1808 (inset) is quite warped, and its center is unusually bright and blue. ... Sunspots are about the size of the Earth and frequently occur in groups, as shown above. ... Mars: Ridges Near the South Pole . ... Clouds Over Tharsis on Mars . ... When and where do clouds form on Mars? ...

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

filecommander (2.50-alpha16) squeeze; urgency=low * Alpha 16 - Optimise directory compare to be faster when comparing directories with a very large number of files. Improve the way the Make Archive dialog creates the target archive file name. Fix loading of [Archiver:TAR/XZ] config section. ... Enable TAB to switch between left & right panels when in full width mode. Fix display update bug when a left full width panel has a very long full path. ...

Next: GOCG Post-Observation Products . ... Reconstructed Orbit . JPL MMNAV Reconstructed Orbit . ... The JPL MMNAV files will be made available on the JPL MMNAV FTP site in directory [RAstron.ODDATA.JPLICV.TRACK] (note the capital letters). back to top . ... What: X-band Doppler tracking data will be transmitted in near real-time from the DSN GTS to the JPL MMNAV team and from the Pushchino GTS to the ASC navigation team, and post-pass (via FTP) from the GBTS to the JPL MMNAV team. ...

Microsymposium 38, MS083, 2003 (A4 format) MERCURY: LOCAL VARIATIONS OF THE PHOTOMETRIC RELIEF. ... Because of trajectory and pointing angle constraints the planet could be observed from Mariner 10 only over a small range of phase angles between about 75o and 110o. Therefore the photometric investigations are restricted to measuring the distribution of brightness on the Mercurian disk. ... Raw versions of real-time processing pictures FDS 0000984 and FDS 0000986 were used (images 196 and 202). ...

CALCSYM - complex evaluator . ... CALCSYM.exe and CALCSYMi.exe will allow you to obtain numeric solution for *.out file generated by both CIRSYM and MATSYM programs (computation of freqency responces, unknowns, determinants, sensitivity analysis etc.. ... Setup file name for CALCSYM is "setup.cal". ... CALCSYMi.exe will allow you to work with long double over the range from 3.4*E-4932 to 3.4*E+4932. ... To calculate, run CALCSYM.exe and enter "file_name.OUT" or click on the "ENTER" (in "OUT" case). ...

... It provides long range planning information to the scheduling team; it provides bright object, timing, and orientation information to the observation planning team; and it provides graphical description of the observations and their constraints. ... The GUI graphically displays the constraints that are computed by Spike and stored in the description files and in the database. ... BOAS processes all bright objects that have entered the database since the last time BOAS was run. ...

. Image of the inner 3 square degrees of the NGFS survey footprint compared with the size of the Moon. Low surface brightness dwarf galaxies are marked by red circles. Gray circles indicate previously known dwarf galaxies. The dwarf galaxies, which vastly outnumber the bright galaxies, may be the missing satellites predicted by cosmological simulations. NOAO

... Finding Stars . ... Handling Bad Pixels . ... The guide camera image controller can control one or more guide cameras. ... Each time the camera is read, the image is automatically saved to a fits file on a shared disk. ... Cameras that have bad pixels require "bad pixel maps" in order to find stars, centroid or even compute statistics for the image. ... View this image (for instance in NIH Image) and determine an upper and lower cutoff; pixels whose values are outside of this range are considered...

Next: File Manipulation Routines Up: File and Directory Manipulation Previous: File and Directory Manipulation . This basically involves calling appropriate functions. int chdir(char path) - changes directory to specified path string. ... NOTE: rindex() is a string handling function that returns a pointer to the last occurrence of character c in string s , or a NULL pointer if c does not occur in the string. ( index() is similar function but assigns a pointer to 1st occurrence.) ...

The bisque directory contains software for communicating with Software Bisque's Paramount ME. mks === This protocol is a native linux application. ... The protocol has been tested only with the Paramount ME's serial interface. ... It should be possible to switch back and forth between these applications. tsx === This protocol communicates with TheSkyX Professional (TSX) through its Orchestrate scripting program. ... At this time TSX and Orchestrate are available for Windows and Mac OSX, but not Linux. ...