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The physics of consolidation of a thawing soil is formulated in terms of the well-known theories of heat conduction and of linear consolidation of a compressible soil. A moving boundary problem results, and closed form solutions have been obtained for several cases of practical interest. The results are presented in terms of normalized pore pressure distributions. It is shown that the excess pore pressures and the degree of consolidation in thawing soils depend primarily on the thaw consolidation ratio.

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Phosphorus chemical shifts are relative to phosphoric acid and not as stated. In compound ( 5 ) the phosphorus chemical shift of the P2C3 ring was omitted; it is +35.6 p.p.m.Typeset and printed by Black Bear Press Limited,

The electron transmission spectra of 1,3,5-tri-tert-butylbenzene, 2,4,6-tri-tert-butylpyridine, 2,4,6-tri-tertbutylphosphabenzene, and 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene have been investigated and interpreted by means of quantum chemical calculations. Scaled virtual orbital energies obtained from calculations without employing diffuse functions provide good numerical values for the vertical electron attachment energies (VAEs). B3LYP/6-311+G* VAEs, calculated as the energy difference between the anion and the neutral molecule, were in good agreement with experiment, with the molecules investigated here having VAEs of less than about 1 eV. The first anion state of phosphabenzene is predicted to lie at the edge of stability. The gradual replacement of CH units by phosphorus in π systems results in a significant stabilization of the anionic states, which contrasts with the relative invariance of the electron donor properties. This behavior can be explained by considering that for the PdC π system both the interaction between the atomic levels ( ) and the overlap are smaller than for the CdC π system.