... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

... Apache HTTP Server Version 2.4 . Apache > HTTP Server > Documentation > Version 2.4 . ... The Shared Object Cache provides a means to share simple data across all a server's workers, regardless of thread and process models . ... Initialize the cache. ... Destroy a given cache instance object. apr_status_t store(ap_socache_instance_t *instance, server_rec *s, const unsigned char *id, unsigned int idlen, apr_time_t expiry, unsigned char *data, unsigned int datalen, apr_pool_t *pool) . ...

... Classes . ... casa::ArrayQuantColumn< T > . ... Provides read/write access to Array Quantum columns in Tables. ... reference (const ArrayQuantColumn < T > &that) . ... IPosition shape (2, 3, 2); Array Quantum Double qArr(shape); Bool deleteIt; Quantum Double * q_p = qArr.getStorage(deleteIt); q_p - setValue(1.41212); q_p - setUnit( GHz ); q_p ++; q_p - setValue(1.4921); q_p - setUnit( deg ); q_p ++; q_p - setValue(1.4111); q_p - setUnit( ms-1 ); q_p ++; q_p - setValue(1.4003...

... Next: An Abstract Data Up: Data Models and Previous: What is an . ... We describe a possible data structure designed to improve propagation of physics information in an analysis system, and an associated subroutine library for combining physical units. ... It has the size and shape of the physical data array, and its pixel values represent the exposure time for that element of the array. ... A Unit handling library parses physical unit definitions, and provides simple routines to combine them. ...

... Animation . Arrow . ... I created the first animation by running Script-Fu / Animators / Fire on the head of an arrow. ... I merged the animation with the background image, and specified a final X offset of -128 (the background is 128 pixels wide). This results in an animation with a nice moving background. Note that you can also use a background that is wider than the image, as long as you specify the width of the background for the final X offset if you want the final animation to loop. ...

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. ...

... The STECF IRAF layered package impol provides five tasks specifically aimed at reduction of HST imaging polarimetry data for ACS, FOC, NICMOS and WFPC2. ... Reduction of HST polarimetry data and simulation of raw polarimetry images, together with polarization vector plotting, are covered. ... hstpolsim -- Produce simulated polarization input data frames for HST instruments from images of the total signal, the linear polarization and the position angle of the polarization vectors. ...