Synopsis of the Executive Profile of Environmental Management: Mesoamerican Subregion

This executive profile summarized here identifies the great environmental challenges of the Mesoamerican region, highlights the achievements of the last decade, and points out the future course that will guide the region's environmental management advancements. There are three main issues addressed here: natural resources management, environmental impact of urban and industrial development and the relationship between the environment and competitiveness. This document was presented at the Environment Network of the Regional Policy Dialogue's 1st Hemispheric Meeting: Towards an Effective Environmental Management held on April 4th and 5th, 2002.Environment & Natural Resources :: Environmental Policy, Environment & Natural Resources :: Biodiversity, Environment & Natural Resources :: Natural Resources Management, Environmental Management

\u3ci\u3eEnallagma Anna,\u3c/i\u3e A Damselfly New to the Great Lakes Region (Odonata: Coenagrionidae)

Enallagma anna, a predominantly western North America damselfly, is now recorded from southwestern Michigan and southwestern Ontario for the first time

Josephson Junctions with a synthetic antiferromagnetic interlayer

We report measurements of the critical current vs. Co thickness in Nb/Cu/Co/Ru/Co/Cu/Nb Josephson junctions, where the inner Co/Ru/Co trilayer is a "synthetic antiferromagnet" with the magnetizations of the two Co layers coupled antiparallel to each other via the 0.6 nm-thick Ru layer. Due to the antiparallel magnetization alignment, the net intrinsic magnetic flux in the junction is nearly zero, and such junctions exhibit excellent Fraunhofer patterns in the critical current vs. applied magnetic field, even with total Co thicknesses as large as 23 nm. There are no apparent oscillations in the critical current vs. Co thickness, consistent with theoretical expectations for this situation. The critical current of the junctions decays over 4 orders of magnitude as the total Co thickness increases from 3 to 23 nm. These junctions may serve as useful templates for future explorations of spin-triplet superconducting correlations, which are predicted to occur in supercon- ducting/ferromagnetic hybrid systems in the presence of certain types of magnetic inhomogeneity.Comment: 4 pages, 5 figure

Proximity-induced density-of-states oscillations in a superconductor/strong-ferromagnet system

We have measured the evolution of the tunneling density of states (DOS) in superconductor/ferromagnet (S/F) bilayers with increasing F-layer thickness, where F in our experiment is the strong ferromagnet Ni. As a function of increasing Ni thickness, we detect multiple oscillations in the DOS at the Fermi energy from differential conductance measurements. The features in the DOS associated with the proximity effect change from normal to inverted twice as the Ni thickness increases from 1 to 5 nm.Comment: 4 pages, 4 figure

Pamphlet, envelope, and blanks for The Pratt Teachers\u27 Agency.

Pamphlet detailing the services provided by The Pratt Teachers\u27 Agency as well as an envelope and blanks from the same

The Pratt Teachers\u27 Agency

Booklet describing the Pratt Teachers\u27 Agency as well as an envelope from the same

Switching Current vs. Magnetoresistance in Magnetic Multilayer Nanopillars

We study current-driven magnetization switching in nanofabricated magnetic trilayers, varying the magnetoresistance in three different ways. First, we insert a strongly spin-scattering layer between the magnetic trilayer and one of the electrodes, giving increased magnetoresistance. Second, we insert a spacer with a short spin-diffusion length between the magnetic layers, decreasing the magnetoresistance. Third, we vary the angle between layer magnetizations. In all cases, we find an approximately linear dependence between magnetoresistance and inverse switching current. We give a qualitative explanation for the observed behaviors, and suggest some ways in which the switching currents may be reduced.Comment: 3 pages, 4 figure