/sci/ - Science & Math

Anonymous Wed Jun 20 16:17:58 2012 No.4795679 [View]
File: 13 KB, 500x150, major total syntheses of aspidospermine.gif [View same] [iqdb] [saucenao] [google]

>>4795506
the Computation of Average Transients (CAT) is used routinely in FT-NMR spectroscopy (nuclear magnetic resonance) to improve the signal-noise ratio of nmr spectra. The signal is measured repeatedly n times and then averaged.

Assuming that the noise is white and that its variance is constant in time it follows by error propagation that

Thus, if 10,000 measurements are averaged the signal to noise ratio is increased by a factor of 100, enabling the measurement of 13C NMR spectra at natural abundance (1.1%) of 13C.

>Special consideration should be given to comparing the strategies of Stork '63, Martin '80, Heathcock '00, Aube '00, and Zard '06.
http://www.scripps.edu/nicolaou/images/pdfs/MS456.pdf

Your review on Quantum Physics http://punsterproductions.com/~sciencehistory/pdf/Paislect.pdf

Pic related, its major total syntheses of aspidospermine

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