848 research outputs found
Space shuttle main engine hardware simulation
The Huntsville Simulation Laboratory (HSL) provides a simulation facility to test and verify the space shuttle main engine (SSME) avionics and software system using a maximum complement of flight type hardware. The HSL permits evaluations and analyses of the SSME avionics hardware, software, control system, and mathematical models. The laboratory has performed a wide spectrum of tests and verified operational procedures to ensure system component compatibility under all operating conditions. It is a test bed for integration of hardware/software/hydraulics. The HSL is and has been an invaluable tool in the design and development of the SSME
Whole-blood sorting, enrichment and in situ immunolabeling of cellular subsets using acoustic microstreaming
Analyzing undiluted whole human blood is a challenge due to its complex composition of hematopoietic cellular populations, nucleic acids, metabolites, and proteins. We present a novel multi-functional microfluidic acoustic streaming platform that enables sorting, enrichment and in situ identification of cellular subsets from whole blood. This single device platform, based on lateral cavity acoustic transducers (LCAT), enables (1) the sorting of undiluted donor whole blood into its cellular subsets (platelets, RBCs, and WBCs), (2) the enrichment and retrieval of breast cancer cells (MCF-7) spiked in donor whole blood at rare cell relevant concentrations (10 mL− 1), and (3) on-chip immunofluorescent labeling for the detection of specific target cellular populations by their known marker expression patterns. Our approach thus demonstrates a compact system that integrates upstream sample processing with downstream separation/enrichment, to carry out multi-parametric cell analysis for blood-based diagnosis and liquid biopsy blood sampling
Swelling of acetylated wood in organic liquids
To investigate the affinity of acetylated wood for organic liquids, Yezo
spruce wood specimens were acetylated with acetic anhydride, and their swelling
in various liquids were compared to those of untreated specimens. The
acetylated wood was rapidly and remarkably swollen in aprotic organic liquids
such as benzene and toluene in which the untreated wood was swollen only
slightly and/or very slowly. On the other hand, the swelling of wood in water,
ethylene glycol and alcohols remained unchanged or decreased by the
acetylation. Consequently the maximum volume of wood swollen in organic liquids
was always larger than that in water. The effect of acetylation on the maximum
swollen volume of wood was greater in liquids having smaller solubility
parameters. The easier penetration of aprotic organic liquids into the
acetylated wood was considered to be due to the scission of hydrogen bonds
among the amorphous wood constituents by the substitution of hydroxyl groups
with hydrophobic acetyl groups.Comment: to be published in J Wood Science (Japanese wood research society
Observation of Magnetic Supercooling of the Transition to the Vortex State
We demonstrate that the transition from the high-field state to the vortex
state in a nanomagnetic disk shows the magnetic equivalent of supercooling.
This is evidence that this magnetic transition can be described in terms of a
modified Landau first-order phase transition. To accomplish this we have
measured the bulk magnetization of single magnetic disks using nanomechanical
torsional resonator torque magnetometry. This allows observation of single
vortex creation events without averaging over an array of disks or over
multiple runs.Comment: 11 pages preprint, 4 figures, accepted to New Journal of Physic
Dopant Spatial Distributions: Sample Independent Response Function And Maximum Entropy Reconstruction
We demonstrate the use of maximum entropy based deconvolution to reconstruct
boron spatial distribution from the secondary ion mass spectrometry (SIMS)
depth profiles on a system of variously spaced boron -layers grown in
silicon. Sample independent response functions are obtained using a new method
which reduces the danger of incorporating real sample behaviour in the
response. Although the original profiles of different primary ion energies
appear quite differently, the reconstructed distributions agree well with each
other. The depth resolution in the reconstructed data is increased
significantly and segregation of boron at the near surface side of the
-layers is clearly shown.Comment: 5 two-columne pages, 3 postscript figures, to appear in Phys. Rev.
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UGA’s Green Infrastructure Plan: Student Envisioned Plans to Improve Ecosystem Services on Campus
Proceedings of the 2011 Georgia Water Resources Conference, April 11, 12, and 13, 2011, Athens, Georgia.Graduate students from the “Nature and Sustainability” studio course at UGA’s College of Environment and Design created Green Infrastructure Plans for UGA’s Campus. Objectives of this service learning project included gathering inventory information, analyzing existing conditions, garnering stakeholder input and crafting plans at two scales. Students individually prepared campus wide plans, and then created site plans for a specific area. These proposed interventions were based on creating or enhancing a network of linkages and hubs (corridors and patches), otherwise known as Green Infrastructure, which supports ecosystem services such as water and nutrient cycling. Unfortunately, legacy land use and substantial impermeable area on campus hinders ecosystem function. In order to reverse these trends to approach a more sustainable trajectory, students sought to preserve, enhance and/or restore critical ecosystem services. This planning process may inform future planning efforts undertaken by the Office of University Architects to improve the green infrastructure of campus and further sustainability goals.Sponsored by:
Georgia Environmental Protection Division
U.S. Geological Survey, Georgia Water Science Center
U.S. Department of Agriculture, Natural Resources Conservation Service
Georgia Institute of Technology, Georgia Water Resources Institute
The University of Georgia, Water Resources FacultyThis book was published by Warnell School of Forestry and Natural Resources, The University of Georgia, Athens, Georgia 30602-2152. The views and statements advanced in this publication are solely those of the authors and do not represent official views or policies of The University of Georgia, the U.S. Geological Survey, the Georgia Water Research Institute as authorized by the Water Research Institutes Authorization Act of 1990 (P.L. 101-307) or the other conference sponsors
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