3,554 research outputs found
The Skyâs the Limit: Scholarly Communication, Digital Initiatives, Institutional Repositories, and Subject Librarians
The University of Central Floridaâs institutional repository, Showcase of Text, Archives, Research, and Scholarship (STARS), has presented new opportunities for collaboration among the Librariesâ Office of Scholarly Communication, Digital Initiatives, Research Services, and subject librarians. Building on efforts to proactively promote scholarly communication initiatives to the university community, these four units have used the institutional repository as a foundation for collaboration, outreach, marketing, and educational efforts. This article will give an overview of a panel presentation given by members of these four units on STARS and highlight the role the institutional repository has in increasing the collaborative efforts of these four units. Additionally, it will highlight four different perspectives and discuss strategies designed to generate institutional repository interest from the university community. Successful ventures and lessons learned will provide insight into creating a productive interdepartmental framework that is geared toward supporting students and faculty institutional repository projects
Advantageous grain boundaries in iron pnictide superconductors
High critical temperature superconductors have zero power consumption and
could be used to produce ideal electric power lines. The principal obstacle in
fabricating superconducting wires and tapes is grain boundaries-the
misalignment of crystalline orientations at grain boundaries, which is
unavoidable for polycrystals, largely deteriorates critical current density.
Here, we report that High critical temperature iron pnictide superconductors
have advantages over cuprates with respect to these grain boundary issues. The
transport properties through well-defined bicrystal grain boundary junctions
with various misorientation angles (thetaGB) were systematically investigated
for cobalt-doped BaFe2As2 (BaFe2As2:Co) epitaxial films fabricated on bicrystal
substrates. The critical current density through bicrystal grain boundary
(JcBGB) remained high (> 1 MA/cm2) and nearly constant up to a critical angle
thetac of ~9o, which is substantially larger than the thetac of ~5o for YBCO.
Even at thetaGB > thetac, the decay of JcBGB was much smaller than that of
YBCO.Comment: to appear in Nature Communication
From Molecular Cores to Planet-forming Disks: An SIRTF Legacy Program
Crucial steps in the formation of stars and planets can be studied only at midâ to farâinfrared wavelengths, where the Space Infrared Telescope (SIRTF) provides an unprecedented improvement in sensitivity. We will use all three SIRTF instruments (Infrared Array Camera [IRAC], Multiband Imaging Photometer for SIRTF [MIPS], and Infrared Spectrograph [IRS]) to observe sources that span the evolutionary sequence from molecular cores to protoplanetary disks, encompassing a wide range of cloud masses, stellar masses, and starâforming environments. In addition to targeting about 150 known compact cores, we will survey with IRAC and MIPS (3.6â70 Îźm) the entire areas of five of the nearest large molecular clouds for new candidate protostars and substellar objects as faint as 0.001 solar luminosities. We will also observe with IRAC and MIPS about 190 systems likely to be in the early stages of planetary system formation (ages up to about 10 Myr), probing the evolution of the circumstellar dust, the raw material for planetary cores. Candidate planetâforming disks as small as 0.1 lunar masses will be detectable. Spectroscopy with IRS of new objects found in the surveys and of a select group of known objects will add vital information on the changing chemical and physical conditions in the disks and envelopes. The resulting data products will include catalogs of thousands of previously unknown sources, multiwavelength maps of about 20 deg^2 of molecular clouds, photometry of about 190 known young stars, spectra of at least 170 sources, ancillary data from groundâbased telescopes, and new tools for analysis and modeling. These products will constitute the foundations for many followâup studies with groundâbased telescopes, as well as with SIRTF itself and other space missions such as SIM, JWST, Herschel, and TPF/Darwin
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