79 research outputs found
Geology of the Engigstciak Archaeological Site, Yukon Territory
Reports geological investigations is 1956-1957 to aid in dating the archeological finds. Quaternary sediments in a clay and a sand sequence are described; their stratigraphic relationships have been disrupted by soil movements resulting from freezing and thawing and from downslope creep. These soil movements, their mechanisms and rates postulated, apparently buried an organic layer containing artifacts progressively between two layers of marine clay. Due to overturning and mixing of layers of different ages, further complicated by a possible upthrust of the marine clay by glacier ice, the artifacts cannot be dated by geological means. From evidence indicating only one marine invasion coincident with glacial advance however, the archeological material is concluded to postdate the last Pleistocene glaciation
Thermodynamic perturbation theory for dipolar superparamagnets
Thermodynamic perturbation theory is employed to derive analytical
expressions for the equilibrium linear susceptibility and specific heat of
lattices of anisotropic classical spins weakly coupled by the dipole-dipole
interaction. The calculation is carried out to the second order in the coupling
constant over the temperature, while the single-spin anisotropy is treated
exactly. The temperature range of applicability of the results is, for weak
anisotropy (A/kT << 1), similar to that of ordinary high-temperature
expansions, but for moderately and strongly anisotropic spins (A/kT > 1) it can
extend down to the temperatures where the superparamagnetic blocking takes
place (A/kT \sim 25), provided only the interaction strength is weak enough.
Besides, taking exactly the anisotropy into account, the results describe as
particular cases the effects of the interactions on isotropic (A = 0) as well
as strongly anisotropic (A \to \infty) systems (discrete orientation model and
plane rotators).Comment: 15 pages, 3 figure
Observations on Pressures Exerted by Creeping Snow, Mount Seymour, British Columbia, Canada
International Conference on Low Temperature Science. I. Conference on Physics of Snow and Ice, II. Conference on Cryobiology. (August, 14-19, 1966, Sapporo, Japan
The distribution and morphometry of lakes and reservoirs in British Columbia: a provincial inventory
- …