Determination of the Superconductor-Insulator Phase Diagram for One-Dimensional Wires

We establish the superconductor-insulator phase diagram for quasi-one dimensional wires by measuring a large set of MoGe nanowires. This diagram is consistent with the Chakravarty-Schmid-Bulgadaev phase boundary, namely with the critical resistance being equal to R_Q = h/4e^2. We find that transport properties of insulating nanowires exhibit a weak Coulomb blockade behavior.Comment: 5 pages, 4 figure

10-An Archaeological Survey of Calhoun and Jackson Counties, Michigan: 1980 Multiple Transect Survey in the Upper Kalamazoo River Valley

In 1980 the Kalamazoo Basin Survey moved upstream into the upper valley of Calhoun and Jackson Counties, establishing and investigating three transects located between the communities of Battle Creek on the west and Concord on the east (Fig. 1). Transect A encompasses 94.5 km2 of Convis, Emmett, Marshall and Pennfield Townships in Calhoun County. Transect B comprises 74.1 km2 of Albion, Eckford, Marengo and Sheridan Townships in the same county. Transect C includes 82.9 km2 of Concord and Pulaski Townships in Jackson County and represents the final transect to be investigated as part of the project. As in past years, transect boundaries are purposefully irregular, reflecting our desire to include within each survey universe as much ecological diversity as possible

That Dear Home On The Farm

https://digitalcommons.library.umaine.edu/mmb-vp/6627/thumbnail.jp

Grain Boundary Scars and Spherical Crystallography

We describe experimental investigations of the structure of two-dimensional spherical crystals. The crystals, formed by beads self-assembled on water droplets in oil, serve as model systems for exploring very general theories about the minimum energy configurations of particles with arbitrary repulsive interactions on curved surfaces. Above a critical system size we find that crystals develop distinctive high-angle grain boundaries, or scars, not found in planar crystals. The number of excess defects in a scar is shown to grow linearly with the dimensionless system size. The observed slope is expected to be universal, independent of the microscopic potential.Comment: 4 pages, 3 eps figs (high quality images available from Mark Bowick

Cavity Approach to the Random Solid State

The cavity approach is used to address the physical properties of random solids in equilibrium. Particular attention is paid to the fraction of localized particles and the distribution of localization lengths characterizing their thermal motion. This approach is of relevance to a wide class of random solids, including rubbery media (formed via the vulcanization of polymer fluids) and chemical gels (formed by the random covalent bonding of fluids of atoms or small molecules). The cavity approach confirms results that have been obtained previously via replica mean-field theory, doing so in a way that sheds new light on their physical origin.Comment: 4 pages, 2 figure