Next: Examples and Hints Up: CCD Detectors Previous: Cleaning Images . The COMPUTE/IMAGE command can be used to perform the operation of dark subtraction and flat fielding. ... To do a dark subtraction enter the following: COMPUTE/IMAGE DENOM = FLAT_AVG-DARK_AVG . where DENOM is the result frame, FLAT_AVG is the average of flat fields, and DARK_AVG is the average of dark frames. ... To flat--field a data frame, enter the following: COMPUTE/IMAGE SCIE_FLAT = (SCIE_IN-DARK_AVG)/DENOM . ...

You can also sort on a specific part of a field if necessary. To define which part of a field to sort on you give the position in the field at which to start the sort followed by the position in the field at which to end the sort. The position at which to start the sort is given as the number of fields to skip followed by the number of characters to skip. ... tells sort to skip the first two fields and the first three characters of field 3. ...

In this chapter we will consider an example of visual expert system written on the Actor Prolog language. ... There are a lot of methods of oil field bed stimulation that increase output of the oil production: thermal, physical-chemical, gas, microbiological, and others. ... Fig. ... The Top-Most diagram consists of three blocks: the "Describe parameters of hydrocarbon field" block, the "Check adaptability of existed methods of oil production" block, and the "Display solution" block. ... Gas methods. ...

... Doug's Home Page . ... S-Lang structures are converted to hash references in Perl , as shown below. ... n\n ; print Structure contents:\n ; # you can treat $s as a reference to a hash array in most respects, except: # - the order of the keys in the array matches that of the # original S-Lang structure # while ( my ( $ key , $ value ) = each %{$s} ) { print key $ key \t has a value of $ value \n ; } print \n ; $$s{afield} = 'a changed field value '; print ...

... This appendix describes how to use the JavaScript console to evaluate expressions and display error messages to the user. ... Displaying Error Messages with the Console JavaScript 1.2 and earlier versions. ... You can specify whether to automatically open the console when a JavaScript error occurs or to display a dialog box for each JavaScript error. ... To open a dialog box each time an error occurs, add the following line to prefs.js : user_pref("javascript.classic.error_alerts", true); . ...

... Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point along the field line (drawing below). Field lines converge where the magnetic force is strong , and spread out where it is weak. ... Exploration" home page (index) Glossary . ...

We describe a correspondence between from family of plane quartics over a field k to a family of abelian threefolds over k. This correspondence is the Jacobian up to isogeny. This leads to a solution of Serre's conjecture on non hyperelliptic genus 3 curves. When k is the field of complex numbers, Serre's conjecture reduces to an identity of Klein on Thetanullwerte of genus 3. We give a precise form of Klein's identity in the case considered here . ...

... Summary of reduced ISAAC fields . ... This data release includes eight fully reduced VLT/ISAAC fields in J,H,K s bands covering 50 arcmin 2 of the GOODS region in the Chandra Deep Field South (CDFS). ... 8 ISAAC fields) . ... The 8 ISAAC fields which are part of this data release are superimposed onto a SOFI image (J+K) (part of a previous EIS data release). ... In one case (GOODS field 11/J-band), for which not enough standard stars were available, the ZP was boostrapped from previous SOFI/EIS data...

... Data Reduction Guide . ... Please note that all the instructions herein are specifically for the DIS RED chip, the same goes for the BLUE chip, just redo everything but with filenames having "b's" in them instead of "r's". Incidentally as best as I can tell the image region for the RED chip is [145:755,230:665] and for the BLUE chip it is [125:480,125:375] . ... At this point you need to load the ccdredd package. ... Oh, and the read-noise for both chips is 9.5 electrons. ...

. Main Page Data Structures File List Data Fields Globals . Data for OI_TARGET FITS table. More... #include < exchange.h > . int . revision . int . ntarget . target * . targ . Data for OI_TARGET FITS table. int _oi_target::revision . int _oi_target::ntarget . target * _oi_target::targ . The documentation for this struct was generated from the following file: . exchange.h . Generated on Mon Apr 7 11:31:33 2003 for OI FITS Example Code by 1.2.14 written by Dimitri van Heesch , 1997-2002

... Files in red?history) . ... Field Lines . ... EM Waves . ... Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. ... Maxwell Most scientists nowadays view field lines as intangible abstractions, useful only for describing magnetic fields. ... Maxwell also showed (perhaps his greatest achievement) that an "electromagnetic wave" was possible, a rapid interplay of electric and magnetic fields spreading with the velocity of light. ...

... Classes . ... Definition at line 87 of file SDSourceHandler.h . ... Definition at line 114 of file SDSourceHandler.h . ... Definition at line 137 of file SDSourceHandler.h . ... Definition at line 116 of file SDSourceHandler.h . ... Definition at line 139 of file SDSourceHandler.h . ... Definition at line 134 of file SDSourceHandler.h . ... Definition at line 117 of file SDSourceHandler.h . ... Definition at line 138 of file SDSourceHandler.h . ... Definition at line 131 of file SDSourceHandler.h . ...

... As a result of BTA observations of 23 chemically peculiar stars with strong magnetic fields, it was found that in 22 of them the longitudinal magnetic field, measured from the hydrogen line cores are considerably lower (by about 1/3) than the value measured from metal lines in the same spectra. ... New approaches need to be developed in order to interpret the data. ... The Zeeman spectrum of a star with a strong magnetic field, 53 Cam. ...

... This API (Application Programming Interface) document has pages corresponding to the items in the navigation bar, described as follows. The Overview page is the front page of this API document and provides a list of all packages with a summary for each. ... Each package has a page that contains a list of its classes and interfaces, with a summary for each. ... Each of these pages has three sections consisting of a class/interface description, summary tables, and detailed member descriptions: . ...

Follow-up astrometry and recoveries are made with the ANU 40 inch (1.0-m) f/8 reflector at Siding Spring Observatory (IAU code 413). ... A routine follow-up of 2003 WY153 on 2003 Dec 15 became much more than routine when a faint object with unusual motion vector was found close to the target asteroid. ... During routine astrometry with the 1.0-m to improve the orbit of the Apollo asteroid 2004 CB, the asteroid was found on March 30 to have a short tail! ... Siding Spring Survey Main Page . ...

... Bit Fields . Bit Fields: Practical Example . ... NOTE: The combination of pointers and bit-level operators makes C useful for many low level applications and can almost replace assembly code. ... To illustrate many points of bitwise operators let us write a function, Bitcount , that counts bits set to 1 in an 8 bit number ( unsigned char ) passed as an argument to the function. int bitcount(unsigned char x) { int count; for (count=0; x != 0; x>>=1); if ( x & 01) count++; return count; } . ...

Blackholes2 Forum Message . ... Post . ... A Field Does Not Contain Energy? ... Post Message | ... Here are two sites of many which use rest mass terminology. http://www.iop.org/EJ/abstract/0026-1394/41/5/S04/ . ... This site refers to the energy contained in a static gravitational field. http://www.ias.ac.in/currsci/mar25/articles27.htm . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... The database contains data of magnetic field observations obtained in the following observatories: Central astronomical observatory ( GAO ) , Crimean astrophysical observatory ( KrAO ) , Institute of terrestrial magnetism and radiowave propagation of Siberian division of RAS (Irkutsk) ( SibIZMIR ) , Institute of terrestrial magnetism and radiowave propagation (Troitsk) ( IZMIRAN ) , Shemacha astrophysical observatory of Azerbajanian AS ( ... GAO IZMIRAN SibIZMIR KrAO UsAO UrAO ShAO . ...

This module provides the ability to set environment variables based upon attributes of the request. ... The mod_setenvif module allows you to set environment variables according to whether different aspects of the request match regular expressions you specify. ... BrowserMatch . ... Syntax: BrowserMatch regex env-variable [= value ] [ env-variable [= value ]] .. ... Module: mod_setenvif . ... The BrowserMatch directive defines environment variables based on the User-Agent HTTP request header field. ...

... 2004 December 30 . M81 and M82: GALEX Full Field . Credit: GALEX Team , Caltech , NASA . Explanation: Intriguing galaxy pair M81 and M82 shine in this full-field view from the orbiting GALEX observatory. GALEX - the Galaxy Evolution Explorer - scans the cosmos in ultraviolet light , a view that follows star formation and galaxy evolution through the Universe . ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...