... Whereas the Fourier transform involves real and imaginary numbers and a complex sum of sinus oidal functions, the Hartley transform involves only real numbers and a real sum of sinusoidal functions. ... Hartley gave up the directIon of his SCIENTIFIC AMERICAN June 1989 © 1989 SCIENTIFIC AMERICAN, INC 93 THE FOURIER AND HARTlEY TRANSFORMS The Fourier and Hartley transforms convert functions of time into functions of frequency that encode phase and amplitude information. ... THE HARTLEY TRANSFORM. ...

Еще в разделе: (Показать все результаты (>2) - hea-www.harvard.edu/ )

... These colors are not only beautiful, they give us clues to the stars’ sizes, ages and life cycle status. ... While stellar life is interesting, stellar death results in many of the objects that amateur astronomers love to observe including planetary nebulae, supernova remnants and black holes. ... Dr. Russell Pinizzotto is currently the Dean of the Faculty of Science and Engineering at Merrimack College in North Andover, MA. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Еще в разделе: (Показать все результаты (>4) - www.atmob.org/ )

During science week in May, the ATNF, in conjunction with the Anglo Australian Observatory (AAO), mounted an exhibit as part of the Powerhouse Museum's exhibition, " Eternal Life - the science of living forever" . It was held over four days from 13-16 May. ... Visitors were encouraged to touch and attempt to lift the meteorite. ... Pictures of the event as well as an interactive computer display can be accessed on the Web at URL: http://www.parkes.atnf.csiro.au/people/jsarkiss/eternal_life . ...

Еще в разделе: (Показать все результаты (>6) - www.atnf.csiro.au/ )

... Its the first time in the history of biology that ther es been anything found that can use one of the differ ent elements in the basic structure," says Paul Davies, dir ector of BEYOND: Center for Funda mental Concepts in Arsenic Discovery continued on page 13 Arsenic Discovery May Affect Search for Life Elsewhere By Dan Harrison In a major discovery that could broaden the search for life beyond Earth, NASA last month announced discover y of an Earth microbe that thrives on arsenic. ...

Еще в разделе: (Показать все результаты (>12) - www.aaa.org/ )

• http://www.aaa.org/EyepieceFiles/aaa/2011_09_September_Eyepiece.pdf
• http://www.aaa.org/EyepieceFiles/aaa/2008_07_July_Eyepiece.pdf

A&A 467, 991­1001 (2007) DOI: 10.1051/0004-6361:20066758 c ESO 2007 Astronomy & Astrophysics Metallicity and age gradients in round elliptical galaxies M. Baes1 , O. K. Sil'chenko2,3 ,A.V. Moiseev4 , and E. A. Manakova2 1 2 3 4 Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, 9000 Gent, Belgium Sternberg Astronomical Institute, University av. ... We probe the stellar population age and metallicity distributions in nearby elliptical galaxies over the largest extension to date. ...