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Le rythme ultradien est un rythme biologique se présentant avec une fréquence supérieure au rythme circadien (fréquence pluriquotidienne), il est donc plus rapide que le rythme circadien. En général, les phases ainsi rythmées se représentent avec une durée de quelques dizaines de minutes à plusieurs heures. Les rythmes ultradiens se retrouvent notamment dans le sommeil (phases du sommeil) et les divers états de vigilance durant le jour.
Monthly Archive for January, 2011
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The threshold pressure P0 for infiltration of Al–12 wt.% Si alloy into compacts of mixtures of alumina and silicon carbide particles having largely different size is investigated. The results are in line with those recently derived from infiltrations of Al into bimodal SiC compacts, namely, P0 remains almost constant for fractions of coarse particles below that which gives the maximum particle volume fraction, decreasing there onwards down to the value corresponding to coarse particles. The experimental data for P0 can be reasonably fitted by generalizing an approach, recently developed for SiC bimodal compacts, which gives P0 in terms of the mixture specific surface area calculated by means of the linear rule of mixtures.
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Liquid metal cooled reactor – Wikipedia, the free encyclopedia
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A Four Step Process for Evaluating Risks in Social Business
via @thierry_lefort
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Fnuck la Fnac et ses ebooks aux DRM !
Enorme! Merci Korben
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calibre is a free and open source e-book library management application developed by users of e-books for users of e-books. It has a cornucopia of features divided into the following main categories:Library Management E-book conversion Syncing to e-book reader devices Downloading news from the web and converting it into e-book form Comprehensive e-book viewer Content server for online access to your book collection (via Korben)
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Lausanne Bondy Blog l’actualité décalée de Lausanne et de ses quartiers
via @romanding
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L’annuaire d’entreprise au cœur de l’intelligence collective | Collaboratif-Info
via @thierry_lefort
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Royal Pingdom » Internet 2010 in numbers
via @oliviertripet
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Les chiffres de l’eCommerce en 2010 | Les chiffres-clés de l’Internet et des nouvelles technologies
via Thierry Lefort
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Comparing US states with countries: US equivalents | The Economist
via @JeanBoileau
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Clickstream Analysis Tools: * Google Analytics (google.com/analytics) – Free * Yahoo Web Analytics (web.analytics.yahoo.com) – Free * Crazy Egg (crazyegg.com) – $9-$99/month Competitive Intelligence Tools * Compete (compete.com) – Prices vary Experimentation and Testing Tools * Google Website Optimizer (google.com/websiteoptimizer) – Free * Optimizely (optimizely.com) – $19-$399/month Voice of Customer Tools * Kissinsights from Kiss Metrics (kissinsights.com) – Free to $29/month * 4Q by iPerceptions (4qsurvey.com) – Free * ClickTale (clicktale.com) – Free to $990 (3 months free on paid plans) Social Analytics * Facebook Insights – Free * Twitalyzer (twitalyzer.com) – Free via Thierry Lefort
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AT&T Matches Verizon’s Prepaid Data Plans: Tech News and Analysis «
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via @anaisle
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YouTube – Extreme Climbing to top of 1768 ft radio tower
This video is an absolute nightmare for anyone subject to acrophobia… Via http://skepticblog.org/2011/01/13/fear-of-heights-sort-of/
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No scientific discovery is named after its original discoverer. via @mfavez
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On nomme loi de Zipf une observation empirique de la fréquence des mots dans un texte. Elle a pris le nom de son auteur, George Kingsley Zipf (1902-1950). Cette loi a été par la suite généralisée par Benoit Mandelbrot. via @anhtuann
