Next: Implementation Up: Compensation for Read-Out Noise Previous: Compensation for Read-Out Noise . Various methods are being used to compensate for the resolution loss that is present in image data acquired by the Hubble Space Telescope. ... There are a variety of noise sources present in HST image data acquired with a CCD camera. ... We use the term background counts for the cumulative effect of these extraneous electrons. Background counts are Poisson distributed. ...

... Let be a random deviate which follows a Poissonian probability distribution about the expectation value . Although the Poisson distribution itself is only defined for integer , one can find the following continuous `envelope function' to the Poisson values: . ... where is the gamma function . ... The expectation value of is . ... Equation 5 is used both in the present program and in boxdetect to estimate the null-hypothesis probability distribution of the weighted sum of Poissonian images. ...

... Next: Cheating Poisson: A Up: Statistical Analysis Previous: Spatial Models and . ... The spatial distribution of stars in the Local Group dwarf irregular galaxy NGC 6822 has been studied, using recent positions and deep photometry for about 15,000 stars in the galaxy. Based on photometrical data, OB stars and red stars could be studied separately. Spatial statistical tools have been applied to the analysis of the spatial structure. ... Figure: Model selection by the aid of CAIC . ...

... Using sl_array . Array information . ... Inline::SLang . Doug's Home Page . ... Since the support for arrays in S-Lang and Perl do not match, the conversion of array values between the two languages is not entirely seemless, as shown in the examples below. ... The third option is to use a Perl Array_Type object to store the data; the Array_Type class is part of Inline::SLang and is as inefficient as using an array reference but does retain knowledge about the array size and type. ...

... The Boolean object is an object wrapper for a boolean value. ... JavaScript 1.3: added toSource method . ... If value is omitted or is 0, -0, null, false, NaN , undefined, or the empty string ( "" ), the object has an initial value of false. All other values, including any object or the string "false" , create an object with an initial value of true. ... For Boolean objects and values, the built-in toString method returns the string "true" or "false" depending on the value of the boolean object. ...

... The changebar (represented by two hyphens in the image) appears in the 10px space to the left of the paragraph. The illustration shows a vertical line that represents the left edge of the paragraph's containing block. ... The change bars (two red hyphens) appear to the left of the word "THIS", which begins the fourth line of text. The following PRE element simulates the example. Vertical bars represent the left containing block edge. ... to the left of the line containing | ...

Spectrophotometric resources (galaxies and stars) . HyperLeda home | ... LL_ELODIE "low-resolution" ELODIE archive . Resolution 0.055 nm (FWHM); W-range: 400 - 680 nm; 1388 stars; 1962 spectra . ... Resolution 0.013 nm (FWHM); W-range: 400 - 680 nm; 1388 stars; 1962 spectra . ... Resolution 0.4 nm; W-range: 580 - 1020 nm; 137 spectra; 126 stars . ... Resolution 1 nm; W-range: 480 to 770 nm; 18 spectra; 18 stars . ... Resolution 0.15 nm (FWHM); W-range: 395 - 475 nm; 78 spectra; 78 stars . ...

Next: Radial velocity of the Up: Optical spectrum of IRAS04296 Previous: Observations and spectra reduction . ... However, molecular emission features are only very rarely observed in the optical spectra of PPNe. ... On the other hand, it is well known that cometary nuclei spectra show prominent Swan band emission. In both spectra of IRAS04296 we have discovered strong emission in the (0;0) and (0;1) bands of the Swan system of the molecule. ... Now consider the case of IRAS04296. ...

... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

Following are instructions to build and install the programs in this distribution. Make sure that you have all necessary tools for building executables. ... The automatic build process expects a configuration file called Config.local . ... The configuration file specifies the directory in which to install the binaries, as well as control over the generation of debugging code and reference clock support. ... Cleans out object files, programs and temporary files. make distclean . ...

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Results on nonequilibrium distributions of charged particles and radioisotope sources of current are as the following: . the new power-law distribution of charged particles in nonequilibrium media, for example, in the thin metalic films, under powerful energy source pumping were obtained ( together with V.I.Karas, V.M.Kontoriovich, V.E.Novikov); . ...

... These computer models are doing very well, but not yet well enough. The problem is dynamic range: any simulation that models a large enough piece of the universe to be representative (a cube of 100 Mpc on a side seems sufficient), cannot have the resolution to accurately follow what happens on galactic scales ( kpc). At present, each point in the n-body code represents around , and you cannot model star formation and galaxy dynamics with only particles. ...

... Base class for random number generators. ... Resets the random number generator. virtual uInt . ... Return the 32-random bits as an unsigned integer. ... A distinction must be made between random number generators , implemented by class derived from RNG , and random number distributions . ... Random distributions are constructed from classes derived from RNG , the actual random number generators. The RNG class contains no data; it only serves to define the interface to random number generators. ...

All teams have to inform the Olympic Coordinating Council (OCC) and the Local Organizing Committee (LOC) about their participation not later than the dates determined by the Acting Statutes/Regulations on the International Astronomy Olympiad , send applications and pre-applications in time. ... For the countries, starting their activity at the International Astronomy Olympiad (see the Supplementary Instructions N 3 ), the requirements for the short report are not strong. ... Personal data for visas. ...

This module illustrates many of the aspects of the Apache 1.2 API and, when used, demonstrates the manner in which module callbacks are triggered by the server. ... Source File: mod_example.c . ... The files in the src/modules/example directory under the Apache distribution directory tree are provided as an example to those that wish to write modules that use the Apache API. ... Example . ... Uncomment the "AddModule modules/example/mod_example" line near the bottom of the src/Configuration file. ...

ERS -1,2 SAR . ... SIR-C/X SAR . ... European Remote Sensing Satellite (ERS-1) was launched on 17 July 1991, and the follow mission ERS-2 (with the same sensors and an Ozone monitoring instrument added) was launched on 21 April 1995. ... The Spaceborne Imaging Radar-C/X-band Synthetic Radar (SIR-C/X-SAR), carried in the cargo bay of the Space Shuttle Endeavour in April and October of 1994, simultaneously recorded SAR data at three wavelengths (L-, C-, and X-bands; 23.5, 5.8, and 3.1 cm, respectively). ...

Appendix H. VDPAU Support . ... The maximum supported resolution is 4096x4096. ... The maximum supported resolution is 8192x8192. ... Appendix A, Supported NVIDIA GPU Products lists which GPUs support which video feature set. ... Minimum width or height: 3 macroblocks (48 pixels). Maximum width or height: 128 macroblocks (2048 pixels). Maximum macroblocks: 8192 . ... Maximum width: 127 macroblocks (2032 pixels). Maximum height: 128 macroblocks (2048 pixels). ... Appendix G. XvMC Support . ...

Variations of total ozone content and lower ozone stratosphere temperature in Antarctic Region during winter-spring period A.V. Grytsai National Taras Shevchenko University of Kyiv Astronomy and Space Physics Department assen@univ.kiev.ua Data, used in the work work Total ozone: Total Ozone Mapping Spectrometer (TOMS) measurements during 1979 - 2005 and Ozone Monitoring Instrument (OMI) ones for 2006, for http://toms.gsfc.nasa.gov/ftpdata.html. ... A long-term TOC decrease is significant. ...

... The data from the images during this period is as follows: 09_1846.fit sur,sig= 2669.5 8.8 plat,sig= 2682.6 7.9 P-S= 13.1 DT= 0.8 . 09_1852.fit sur,sig= 2666.5 8.0 plat,sig= 2679.2 8.1 P-S= 12.7 DT= 0.6 . ... 09_1912.fit sur,sig= 2659.9 8.4 plat,sig= 2669.5 8.1 P-S= 9.6 DT= 0.0 . ... The filenames are date_mst.fit; sur,sig give the mean level in the image of the surround and the noise. plat,sig give the mean level in the heated plate and its noise. ... noise: < 0.16 C-deg-(min)^0.5 . ...