2,569 research outputs found
Superconductivity and magnetism in platinum-substituted SrFe2As2 single crystals
Single crystals of SrFe2-xPtxAs2 (0 < x < 0.36) were grown using the self
flux solution method and characterized using x-ray crystallography, electrical
transport, magnetic susceptibility, and specific heat measurements. The
magnetic/structural transition is suppressed with increasing Pt concentration,
with superconductivity seen over the range 0.08 < x < 0.36 with a maximum
transition temperature Tc of 16 K at x = 0.16. The shape of the phase diagram
and the changes to the lattice parameters are similar to the effects of other
group VIII elements Ni and Pd, however the higher transition temperature and
extended range of superconductivity suggest some complexity beyond the simple
electron counting picture that has been discussed thus far.Comment: 6 pages, 6 figure
Intensive Rotational Grazing of Steers at the Andrew Jackson Demonstration Farm
Fifty head of crossbred steers started grazing 51 acres of pasture on May 1 in a rotational grazing system using a variable density paddock system. Twenty-two head grazed 92 days, 27 grazed 140 days, and one steer died. A total of 11,922 pounds was produced on 5,804 animal-days of grazing. The average daily gain was 2.02 pounds for group 1 and 2.07 for group 2. The stocking rate for the first 92 days was .98 steers per acre and .53 for the final 48 days. The animal days of grazing per acre was 113 and the pounds of gain per acre was 233. Total return for land, labor and management for the demonstration was 55.49/acre
Management Intensive Grazing of Stockers at the Andrew Jackson Demonstration Farm (1996 – 1998)
The Andrew Jackson Demonstration Farm (AJDF) is located in central Jackson County in east central Iowa. A board of directors operates the farm for the purpose of demonstrating different production practices and management strategies. From 1996 to 1998 management intensive grazing practices and the grazing of stockers on a combination of permanent and tillable pasture have been demonstrated. Grazing strategies or practices demonstrated during these years included establishment of Eastern Gamagrass and Big Bluestem, variable density grazing, measuring forage on-offer, estimating dry matter intake, grazing corn, pasture renovation, and fencing and water systems. Production performance data were gathered for the three years stockers that were grazed. During this time the stockers averaged 121 animal days of grazing, a 1.1 head per acre stocking rate, a 1.85 pound average daily gain, and 228 pounds of gain per acre. The financial measures evaluated the value of gain on pasture and the pasture cost of the gain. The value of gain per pound was positive for 1996 and 1997 at .52 whereas in 1998 it was a -.12 to $.16. Production performance is only one part of the profit picture when evaluating a stocker operation. Buysell margins are the other significant part that can greatly impact the profit potential of a summer grazing program
Structure and superconductivity of LiFeAs
The lithium ions in Lithium iron arsenide phases with compositions close to
LiFeAs have been located using powder neutron diffraction. These phases exhibit
superconductivity at temperatures at least as high as 16 K demonstrating that
superconductivity in compounds with [FeAs]- anti-PbO-type anionic layers occurs
in compounds with at least three different structure types and occurs for a
wide range of As-Fe-As bond angles.Comment: 3 pages, 3 figures, 3 table
Pressure shift of the superconducting T_c of LiFeAs
The effect of hydrostatic pressure on the superconductivity in LiFeAs is
investigated up to 1.8 GPa. The superconducting transition temperature, T_c,
decreases linearly with pressure at a rate of 1.5 K/GPa. The negative pressure
coefficient of T_c and the high ambient pressure T_c indicate that LiFeAs is
the high-pressure analogue of the isoelectronic SrFe_2As_2 and BaFe_2As_2.Comment: 3 pages, 2 figure
Library Publishing Toolkit
Both public and academic libraries are invested in the creation and distribution of information and digital content. They have morphed from keepers of content into content creators and curators, and seek best practices and efficient workflows with emerging publishing platforms and services. The Library Publishing Toolkit looks at the broad and varied landscape of library publishing through discussions, case studies, and shared resources. From supporting writers and authors in the public library setting to hosting open access journals and books, this collection examines opportunities for libraries to leverage their position and resources to create and provide access to content.The Library Publishing Toolkit is a project funded partially by Bibliographic Databases and Interlibrary Resources Sharing Program funds which are administered and supported by the Rochester Regional Library Council. The toolkit is a united effort between Milne Library at SUNY Geneseo and the Monroe County Library System to identify trends in library publishing, seek out best practices to implement and support such programs, and share the best tools and resources. Our goals include to: Develop strategies libraries can use to identify types of publishing services and content that can be created and curated by libraries. Assess trends in digital content creation and publishing that can be useful in libraries and suggesting potential future projects. Identify efficient workflows for distributing content for free online and with potential for some cost-recovery in print on demand markets.
A list of chapters is available in the full record.https://knightscholar.geneseo.edu/idsproject-press/1002/thumbnail.jp
Determination of characteristic muon precession and relaxation signals in FeAs and FeAs2, possible impurity phases in pnictide superconductors
We report muon-spin relaxation measurements of highly homogeneous samples of
FeAs and FeAs2, both previously found as impurity phases in some samples of
recently synthesized pnictide superconductors. We observe well defined muon
precession in the FeAs sample with two precession frequencies of 38.2(3) and
22.7(9) MHz at 7.5 K, with the majority of the amplitude corresponding to the
lower frequency component. In FeAs2 we confirm previous measurements showing
that no long-ranged magnetic order occurs above 2 K and measure the muon spin
relaxation rate, which increases on cooling. Our results exclude the
possibility that previous muon-spin relaxation measurements of pnictide
superconductors have been measuring the effect of these possible impurities.Comment: 4 pages, 3 figures, corrected Figure
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