Second Narrows Bridge

Freeman, R, Otter, J. R. H., The collapse of the Second Narrows Bridge, Vancouver, Proc. Instn. Civ. Engrs., 1959, 12, April, N36-41. 

Report of the British Columbia Royal Commission, Second Narrows Bridge Enquiry, Vol. I, 1958, British Columbia, Canada. 

Quite complex kinetic behavior has been identified on some surfaces. For instance, on Ir(100), the TPD data from NO-saturated surfaces display two N2 desorption peaks, one at 346 K from the decomposition of bridge-bonded NO, and a second at 475 K from the decomposition of atop-bonded NO molecules [13], Interestingly, the first feature is quite narrow, indicating an autocatalytic process for which the parallel formation of N20 appears to be the crucial step. An additional complication arises from the fact that this Ir(100) surface undergoes a (1x5) reconstruction, and that NO adsorbed on the metastable unreconstructed (lxl) phase leads to N2 desorption at lower temperatures. In another example, on the reconstructed hexagonal Pt(100) surface, when a mixed NO + CO adsorbed layer is heated, a so-called surface explosion is observed where the reaction products (N2, C02 and N20) desorb simultaneously in the form of sharp peaks with half-widths of only 7 to 20 K. The shape of the TPD spectra suggests again an autocatalytic mechanism [14],... 

Figure 8.58. Stereo view in space-filling representation of scallop cross-bridge (SI) showing narrow clefts emanating in two directions from the nucleotide binding site, located by the white circle. One cleft runs upward to the actin binding site, and the second direction is toward the hydrophobic association between the amino-terminal domain and the head of the lever arm in A to effect the hydrophobic...

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