Modulation double

Figure 10.49 Combinatorial biosynthesis of the PK library L29 from modified DEBS modules double- and triple-domain substitution products.

Two signal enhancement schemes capable of providing large signal-to-noise gains in static and MAS NMR spectra of the central transition of half-integer quadrupolar nuclei have been presented by Schurko et al. Amplitude-modulated double-frequency sweeps (AM-DFS) and rotor-assisted population... 

Figure 5 Frequency-modulated double resonance profiles for various pumping schemes in c/s-propionic acid. The sign displayed on the common energy level Indicates whether the pump causes an increase or decrease in the population of that level. (Reproduced with permission from Stiefvater OL (1975) Z Naturforsch 30a 1800.)...

This experiment (double resonance) can be carried out in several ways. Anders et first described a modulated double-resonance... 

The modulated double-resonance technique has the advantage of permitting small changes in product ion intensity to be directly observed and displayed. However, it has the disadvantage of not permitting the total product intensity to be observed during the experiments, and such information can often be useful. 

Dowrey A E and Maroott C 1982 A double-modulation Fourier transform infrared approaoh to studying adsorbates on metal surfaoes Appl. Spectrosc. 36 414-16... 

Double resonance modulated spectroscopy pyridines and benzo derivatives, 2, 104 Dowicil S-13 as fungicide, 2, 515 Doxepin... 

One method of volume variations is by speed modulation. Another, more common method, is the use of clearance pockets, with or without valve unloading. With clearance pockets, the cylinder performance is modified. With valve unloading, one or more inlet valves are physically open. Capacity may be regulated in a single- or double-acting cylinder with single or multiple cylinder configuration. 

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