Microscopic Theory of Magnon-Drag Thermoelectric Transport in Ferromagnetic Metals

A theoretical study of the magnon-drag Peltier and Seebeck effects in ferromagnetic metals is presented. A magnon heat current is described perturbatively from the microscopic viewpoint with respect to electron--magnon interactions and the electric field. Then, the magnon-drag Peltier coefficient \Pi_\MAG is obtained as the ratio between the magnon heat current and the electric charge current. We show that \Pi_\MAG=C_\MAG T^{5/2} at a low temperature $T$; that the coefficient C_\MAG is proportional to the spin polarization $P$ of the electric conductivity; and that $P>0$ for C_\MAG<0, but $P0$. From experimental results for magnon-drag Peltier effects, we estimate that the strength of the electron--magnon interaction is about 0.3 eV$\cdot\AA^{3/2}$ for permalloy.Comment: 3 pages, 2 figures, accepted for publication in Journal of the Physical Society of Japa

The importance of ground water in the Great Lakes Region /

Includes bibliographical references (p. 13).Mode of access: Internet

Study of fouling and corrosion problems related to a solar sea power plant. Progress report, April 1--June 30, 1977

The OTEC heat transfer simulation device, which was developed at CMU in order to investigate heat exchanger biofouling by monitoring heat transfer coefficients, has now been used in several experiments at Keahole Point, Hawaii. The field results have confirmed that the equipment works as expected with a precision in measuring heat transfer coefficients of about 1%. The results show that the biofouling growth is very slow during an initial transient period of about six weeks at which time the fouling resistance is R/sub f/ approximately equal to 20 x 10/sup -5/ hr ft/sup 2/ /sup 0/F/Btu. After this transient, the growth is essentially linear, rising at the rate of about 7 x 10/sup -5/ hr ft/sup 2/ /sup 0/F/Btu-week. These results are independent of material (titanium or aluminum) and flow velocity (6 or 3 feet per second). During the course of these same experiments a preliminary cleaning test was done with a M.A.N. brush. It was found that six passes of the brush reduced the fouling resistance from about 32 hr ft/sup 2/ /sup 0/F/Btu to zero

Hydrogeology and effects of tailings basins on the hydrology of Sands plain, Marquette County, Michigan /

One folded map in pocket.Spine title: Hydrogeology of Sands plain, Marquette County, Michigan.Bibliography: p. 75-77.Mode of access: Internet

Water resources of Lac Vieux Desert Indian community and vicinity, western Upper Peninsula, Michigan /

Shipping list no.: 99-0140-P.Includes bibliographical references (p. 15).Mode of access: Internet

Ground-water contamination in East Bay Township, Michigan /

Five maps on folded sheets in pocket.Bibliography: p. 51-52.Mode of access: Internet

An annotated bibliography of selected references on the estimated rates of direct ground-water discharge to the Great Lakes /

Shipping list no.: 99-0198-P."Prepared in cooperation with the U.S. Army Corps of Engineers, Detroit District."Includes bibliographical references (p. 20-24).Mode of access: Internet

Hydrology and land use in Grand Traverse County, Michigan /

Three maps on 3 folded leaves in pocket.Shipping list no.: 90-741-P.Includes bibliographical references (p. 58-60).Mode of access: Internet