4,872 research outputs found
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
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