The cal values are normally measured using the sky/absorber technique . The data taking setup is normally 25Mhz*4 bands of 256 lags each. Do 3 seconds calOn followed by 3 seconds calOff. Then step the band by 100 Mhz until the entire receiver band is done. ... This cal value uses the Y factor so call it calK_Y. It is also possible to measure the cals using just the absorber or just the sky if you know the receiver temperature (and you assume the reflection coef in the receiver is small). ...

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Next: Third: Create a session Up: Starting up correlator control Previous: First: Log on to б  Contents . Both the correlator interface and the correlator spectra display program are run from lbaccc . ... lbaccc . ... A more complete explanation of SPD, including available commands, is found in Appendix C. Next: Third: Create a session Up: Starting up correlator control Previous: First: Log on to б  Contents . ...

Computer Ephemeris. Second order reduction quantities. Explanations. This page consist of four little tables. First and second tables contains J a (in 0.000001 s ) and J d (0.0001") for nothern declination, third and fourth contains the same information but for southern declination. Each table have 13 informational columns headed with right ascension values, and some amount of rows, labelled with date. ...

... The acquisition of an object for an FGS operating in TRANSFER mode is carried out in the same sequence described above, with the exception that the FGS remains in CoarseTrack until a specified spacecraft time. ... In a TRANSFER mode observation the DF 224 computer steps the FGS's IFOV across the photocenter (determined by CoarseTrack) along a diagonal path in detector space for a distance specified in the original proposal. Each sweep across the target is referred to as a scan. ...

... We then updated to PVCam 2.7.4.2, but we still see corrupt images if we don't close and reopen the camera after every exposure sequence, and the camera sometimes fails to respond to a trigger pulse. ... Close and re-init the camera, as follows: ... pl_cam_close(0) pl_pvcam_uninit() pl_pvcam_init() . ... power off camera . ... Call pl_exp_start_cont (to start a continuous exposure sequence into a circular buffer) with a circular buffer that holds too many images and you will hang your computer. ...

U.S. NAVAL OBSERVATORY WASHINGTON, D.C. 20392-5420 July 23, 1998 No. 64 TIME SERVICE ANNOUNCEMENT SERIES 14 UTC TIME STEP 1. The International Earth Rotation Service (IERS) has announced the introduction of a time step to occur at the end of December, 1998. ... Coordinated Universal Time (UTC) will be retarded by 1.0s so that the sequence of dates of the UTC markers will be: 1998 December 31 23h 59m 59s 1998 December 31 23h 59m 60s 1999 January 01 0h 0m 0s 3. ... Time Service Dept., ...

All stars derive their energy through the thermonuclear fusion of light elements in to heavy elements. High temperatures are required so that the mutual electrostatic repulsion of the protons in each fusing atomic nucleus is overcome. ... Elements with more protons in their nuclei require higher temperatures. ... This sequence is now shown in the animation below. ... First Step of the Proton-Proton Chain Narration . Second Step of the Proton-Proton Chain Narration . ...

Next: The Quasi--Newton Method. Up: Outline of the Previous: The Newton--Raphson Method. ... At each iteration, one computes . ... Neglecting the second derivatives matrix , we obtain the ``normal equations'' and the Gauss--Newton direction . This so--called Gauss--Newton method is intended for problems where is small. ... The algorithm implemented here is a modification of that Gauss--Newton method, that allows convergence even for rank deficient Jacobians or for large residuals. ...

NCR 53CF94, 53CF96 FLYER INFORMATION The NCR 53CF94 and 53CF96 Fast SCSI Controllers are high-performance CMOS devices conforming to ANSI standards X3.131-1986 (SCSI-1) and X3.131-199X (SCSI-2) for the Small Computer Systems Interface (SCSI). ... The NCR 53CF94 and 53CF96 feature 10 megabytes per second (MB/s) Fast SCSI-2 data transfers, improved single-ended SCSI operation, a 24-bit transfer counter, and enhanced SCSI-2 command functionality. ...

... Meade Instruments Corporation . ... Autostar Computer Controllers . 497 Autostar . ... One of the most important advances in telescope control in the past 25 years, th