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Showing posts from November, 2011

### Unary Day

I wouldn't have spent this special day with unary sequence 11h1111s at 11/11/11 without a terrible pun, mentioning it as the anniversary of Attila , since it's "an invasion of the Huns" ("huns" for "ones", uttered with an awful accent); even made a Facebook page for that: Attila Fest . Not proud :) Yet this dull (not in the Ramanujan sense ) sequence reminded me of two nice formula for the golden ratio (aka $\phi$, or the divine proportion): one rational, one radical. So it seems $\phi$ could be tamed (or approched) quite easily. Indeed, it is one of the simplest non-rational numbers, as a root of a basic equation of degree 2. Thus, far from being transcendental . Surprisingly, $\phi$ bears some kind of transcendence (in the religious sense) as it is, somehow, beyond the grasp of the human mind, meaning it cannot be approched easily in a "rational" way, i.e. worse that any other number, as stated in a theorem by Adolf Hurwitz (1856-

### Advances in signal and image processing for physico-chemical analysis

Looking for new frontiers in signal and image processing applications in chemical related analysis? Consider the following call for contributions.  Call for papers: Dossier, Special issue on Advances in signal and image processing for physico-chemical analysis ( pdf ) Deadlines - Intent: December 12th, 2011 / Final manuscript: January 8th, 2012 Oil & Gas Science and Technology - Revue d'IFP Energies Nouvelles (online journal) With the advent of more affordable, higher resolution or innovative data acquisition techniques (for instance hyphenated instrumentation such as two-dimensional chromatography), the need for advanced signal and image processing tools has grown in physico-chemical analysis, together with the quantity and complexity of acquired measurements. Either with mono- (signals) or two-dimensional (from hyphenated techniques to standard images) data, processing generally aims at improving quality and at providing more precise quantitative