Double line sign

In the hip, avascular necrosis (osteonecrosis) has a characteristic double-line sign appearance. 

The worksheet can be made easier to look at by adding lines that separate the column labels and numbers. To create a line under the labels one moves the cell pointer to cell C7, type then =. In LOTUS the backslash ( ) serves as a repeating label prefix. Whatever is typed after the backslash is repeated until it fills the cell. After pressing RETURN cell C7 now contains a row of equal signs ( = ). To continue the double line across the worksheet from cell C7 to cell 07 one can use the / Copy Command. 

It is evident that the projections of the fixed points A and B, in the EJ map, always lie on relative equilibria of type I, but that the position of the overlapping projections of C and D depends on the sign of b — a. If > b the double point is isolated between the two type I equilibria, and quantum monodromy is expected, for a sufficiently dense quantum lattice. If, on the other hand, the critical point lies on the type II relative equilibrium line and... 

The ENDOR technique refers to electron-nuclear double resonance. This consists of the effect on a partially saturated ESR line of simultaneously irradiating the sample with a radiofrequency to induce nuclear resonance transitions of hyperfine coupled nuclei. It may enable one to obtain information about signs of coupling constants. ELDOR is the technique corresponding to electron-electron double resonance. Such techniques, coupled with TRIPLE resonance, have been utilized and well described in a discussion of pyridine and 4,4-bipyridyl radical anion ESR spectra measured in sodium/liquid ammonia (80JMR<41)17). 

Fig. 15. Constitutional formula of pyridox- al (vitamine Bg) as generated on the line printer, an asterisk marks a single bond, a H plus sign a double bond...

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