Huygens

P.D. Wilcox, R.S.C. Monkhouse, M.J.S. Lowe and P. Cawley, The use of Huygens principle to model the acoustic field from interdigital Lamb wave transducers, Review of Progress in Quantitative NDE, Vol 17, Plenum Press, New York, 1998 (in press). 

Dutch mathematician Christiaan Huygens first states his wave theory of light, published in Traite de la lumiere in 1690. 

For example, by retaining only one term which differs from x we derive from (2.27) > (x) = x + xy xi. The solution of this equation represents the different planar planted trees with n nodes which have only vertices of degrees 1 and 3. Cayley already established this result, 2. Cf. F. Levi, Christiaan Huygens, 2 (1922), pp. 307-314, No. 5, further A. Errera, Mdimoires de I Acad mie royale de Belgique 11, 1931, pp. 1-26, No. 15-16. Both contain (2.28) in different form and investigations of planar free trees. 

The most recent results from the successful Cassini-Huygens mission will be discussed in Sect. 11.1.1.3. 

The IRIS spectra of Titan s atmosphere returned from Voyager I show extensive organic composition across the entire disc of Titan (Figure 10.7) and only promises (or threatens) more organic complexity when the measurements from the gas chromatography/mass spectrometry instruments on the Huygens probe are returned. 

It is clear that a complex hydrocarbon polymer chemistry must exist in the atmosphere of Titan involving polyyne species, polynitrile species and mixtures of the two, and additional routes to polyaromatic hydrocarbon formation. This presents a significant problem for the gas chromatography/mass spectrometry instruments on the Huygens probe. There should be hydrocarbon fragments, producing perhaps... 

---