By Luca Turin

ISBN-10: 0061133841

ISBN-13: 9780061133848

One man's ardour for fragrance leads him to discover probably the most exciting medical mysteries: What makes one molecule odor of garlic whereas one other smells of rose? during this witty, engrossing, and wildly unique quantity, writer Luca Turin explores the 2 competing theories of scent. Is smell made up our minds through molecular form or molecular vibrations? Turin describes in attention-grabbing element the technological know-how, the proof, and the usually contentious debate—from the beginnings of natural chemistry to the current day—and can pay homage to the scientists who went prior to. With its uniquely available and alluring method of technological know-how through paintings, the key of odor will entice a person who has ever puzzled in regards to the so much mysterious of the 5 senses.

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Extra resources for The Secret of Scent: Adventures in Perfume and the Science of Smell

Example text

7) specifies the intensity of the nth spectral line of the mean-squared noise current for a group of N mono-energetic (equal ωrev ) particles with random initial phases. In reality we are faced with a distribution of revolution frequencies between ωrev ± ωrev /2. Clearly, then, the different components contribute current in the range n(ωrev ± ωrev /2) around each harmonic n. We thus have a band spectrum, the so-called ‘Schottky noise spectrum’ (or ‘Schottky band spectrum’) of a coasting beam. For a subgroup with a very narrow range dωrev of frequencies we can apply Eq.

Then there is a gain of a factor of 3 in the maximum momentum spread which the system can handle with the same cooling band. As in the filter method sum pickups with their high inherent sensitivity are used. However the electronic noise is—a priory—not reduced, in contrast to filter cooling. g. in the AA, LEAR and the AD at CERN). In the antiproton accumulators, it is used for pre-cooling the low intensity 34 2 Simplified Theory, Time-Domain Picture beam whereas Palmer cooling (with large bandwidth) is applied to control the stack.

It is clear from the analysis that they are due to the oscillatory nature of the particle motion. On average, the particle reveals only half the information on its amplitude when passing the pickup and the position has to transform to an angular error to be corrected at the kicker. The optimum phase-advance pickup to kicker is 28 2 Simplified Theory, Time-Domain Picture π/2 (modulo π ), as anticipated in Sect. 1. In analogy with Eq. 31) the cooling rate, Eq. 42), has a maximum which is proportional to [(1 − M˜ −2 ) sin( ψ)]2 .

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The Secret of Scent: Adventures in Perfume and the Science of Smell by Luca Turin

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