Inverse combs

Prosa, T.J., Winokur, M.J., Moulton J., Smith R, and Heeger, A.J., X-ray structural studies of poly(3-alkylthiophenes) An example of an inverse comb. Macromolecules 25, 4364, 1992. 

PZ (beta is a number between 0 and 1.0, and L is the total length of the string) causes notches to appear in the spectrum at multiples ofy / p. This can be modeled explicitly by feeding in the appropriate initial condition. We can also cleverly get the same effect by placing an inverse comb filter (all zero, harmonically spaced notches) in the excitation path, and adjusting the length to cause the correct nulls in the spectrum. 

The QCPMG FID in the time domain is a continuous series of ca. 10—250 refocused echoes. Since the Fourier transform (FT) of this comb-like function is an inverse comb-fike function, performing an FT of the echo train in the time domain produces a SSNMR spectrum composed of a series of individual spikelets that trace out the manifold of the... 

Class /c, inverse combs, that is, with rigid backbones and flexible side chains. Nematic liquid crystals were obtained by Weissflog and Demus with fairly short backbones. Polymers with higher molecular masses were synthesized by Ballauff. A number of polyesters with polystyrene side chains of different length and number per main chain were obtained by Heitz, Rohrbach and Hocker. ... 

HanP81 Hanlon, P. A cycle-index sum inversion theorem. J. Comb. Theory A30 (1981) 248-269. 

The Doppler-free excitation can best be understood in the frequency domain where the train of pulses appears as a comb of modes, all equally spaced in frequency and covering a spectral region which is roughly equal to the inverse of the pulse duration of a single pulse in the train. For a typical dye laser this might be 500 GHz. If one of the modes is in two-photon resonance with the sample... 

Portier M, Rinaldi-Carmona M, Pecceu F, Combes T, Poinot-Chazel C, Calandra B, Barth F, Le Fur G, Casellas P (1999) SR 144528, an antagonist for the peripheral cannabinoid receptor that behaves as an inverse agonist. J Pharmacol Exp Ther 288 582-589... 

Bouaboula M, Desnoyer N, Carayon P, Combes T, CaseUas P (1999a) Gi protein modulation induced by a selective inverse agonist for the peripheral cannabinoid receptor CB2 impUcation for intraceUular signalization cross-regulation. Mol Pharmacol 55 473-480... 

By adding the backside Cr patterning and the protecting resist to the conventional techniques, comb-shaped 3-D micromesh Ni structures were fabricated as shown in Fig. 5.13. The gap between the micromeshes is 30 pm, the height of the mesh structure is 20 pm, and the diameter of the inclined micropillar is about 3 pm. The inverse-micromesh mold was filled with Ni using a ring-shaped Au as a seed layer for electroplating. Adequate metal is required on the Ni surface for actual use. 

Combes et al. reported investigations of the equilibrium constant of reaction (1.2.4) in the molten KCl-NaCl equimolar mixture [119, 180, 240], The experimental routine consists in addition of a weight of O2- donor to the melt afterwards the equilibrium e.m.f. of the cell with the indicator oxygen electrode (NilNiOlZr02) is measured and the e.m.f. values are determined at partial pressures of water vapour from 0.0013 to 0.011 atm. The calculations of the equilibrium constant of reaction (1.2.4), performed using the obtained e.m.f. values, show that in the temperature range 737-817 °C the dependence of the pK of the equilibrium (1.2.4) upon the inverse temperature is expressed by the following equation ... 

Fig. 5.17. Partial volume of comb-shaped polystyrene chains, in solution in benzene, as a function of the inverse of the total number of links (skeleton and teeth).

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