TWO IMPORTANT ISSUES FOR FFT SPECTROMETERS June 28, 2003 Carl Heiles ABSTRACT We discuss two important issues for power spectra derived from FFTing a time series. These are weighting, which eliminates spectral leakage, and \overlapping the chunks", which eliminates the nonessential increased variance that results from dividing the time series into chunks. ... We have M consecutive chunks of N-point time series, so that we have a continuous time series of length NM with no gaps. ...

... Moon . ... Earth Satellites . ... M42 Orion Nebula (M42) showing complete nebulous complex, including M43, and the combined emission/reflection nebulous complex consisting of NGC 1973, NGC 1975, NGC 1977 (left of frame).( ... Our next spooky spectacle is not too far away as its hiding around the right foot of Orion, at the bright blue supergiant star of Rigel shining like a torch in the dark, and this stellar torch lights up a mischievously secret nebula, IC2118 or the Witch Head Nebula ! ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... les plus belles images de l'Univers dУ?cryptУ?es pour vous . ... des pages consacrУ?es У  la publication de vos photos Mais c'est aussi une vraie communautУ? avec laquelle partager votre passion et nourrir votre curiositУ?. Accueil Lire/Voir/Ecouter Lire/Voire/Ecouter . ... Proposant de nombreuses destinations selon le mois de l'annУ?e, ce guide vous offrira des conditions mУ?tУ?o idУ?ales pour dУ?couvrir les ciels lointains. ...

... Home Articles NYC Urban Starfest ? Background & History of the Event . ... Urban Starfest in Central Park . ... Beyond New York City . ... A History of the First Forty Years of the Amateur Astronomers Association . ... NYC Urban Starfest - Background History of the Event . ... Today the NYC Urban Starfest, while somewhat smaller in nature & scope, but still a most wonderful event, is solely coordinated and directed by the Amateur Astronomer?s Association and the NYC Urban Park Rangers. ...

... Developed by AMD and key industry partners, the Super7 platform supercharges Socket 7 by adding support for 100-MHz and 95-MHz bus interfaces and the Accelerated Graphics Port (AGP) specification and by delivering other leading-edge features, including 100-MHz SDRAM, USB, Ultra DMA, ACPI, and PC 98. Other planned enhancements based on the AMD-K6ў processor family include support for a full-speed backside L2 cache and an optional frontside L3 cache. ... AMD had revenues of $2.4 billion in 1997. ...

Глава 5. ... Изменение массы и размеров небесных тел . Все небесные тела Солнечной системы от Солнца до метеорных тел постепенно увеличивают свою массу посредством вычерпывания диффузной материи, ее аккреции на поверхность небесных тел и падений на небесные тела Солнечной системы других, более мелких небесных тел, как принадлежавших ранее ей, так и не принадлежавших. ... Растет плотность и по мере приближения небесных тел к Солнцу, да и к другим центральным телам. ... Вращение небесных тел. ...