5,073 research outputs found
Water resources data for Alachua, Bradford, Clay, and Union Counties, Florida
A study of the water resources of Alachua, Bradford, Clay, and
Union counties, Florida (fig. 1), was made by the Water Resources
Division of the U. S. Geological Survey in cooperation with the
Florida Geological Survey during the period 1957-61. The results
of this study will be published by the Florida Geological Survey
in the following reports by William E. Clark, Rufus H. Musgrove,
Clarence G. Menke, and Joseph W. Cagle, Jr.: "Interim Report
on the Water Resources of Alachua, Bradford, Clay, and Union
Counties, Florida," "Water Resources of Alachua, Bradford,
Clay, and Union Counties, Florida," and "Hydrology of Brooklyn
Lake, near Keystone Heights, Florida." (Document has 161 pages.
Breakdown of scale-invariance in the coarsening of phase-separating binary fluids
We present evidence, based on lattice Boltzmann simulations, to show that the
coarsening of the domains in phase separating binary fluids is not a
scale-invariant process. Moreover we emphasise that the pathway by which phase
separation occurs depends strongly on the relation between diffusive and
hydrodynamic time scales.Comment: 4 pages, Latex, 4 eps Figures included. (higher quality Figures can
be obtained from [email protected]
Estimation of the hydraulic parameters of unsaturated samples by electrical resistivity tomography
In situ and laboratory experiments have shown that electrical resistivity tomography (ERT) is an effective tool to image transient phenomena in soils. However, its application in quantifying soil hydraulic parameters has been limited. In this study, experiments of water inflow in unsaturated soil samples were conducted in an oedometer equipped to perform three-dimensional electrical measurements. Reconstructions of the electrical conductivity at different times confirmed the usefulness of ERT for monitoring the evolution of water content. The tomographic reconstructions were subsequently used in conjunction with a finite-element simulation to infer the water retention curve and the unsaturated hydraulic conductivity. The parameters estimated with ERT agree satisfactorily with those determined using established techniques, hence the proposed approach shows good potential for relatively fast characterisations. Similar experiments could be carried out on site to study the hydraulic behaviour of the entire soil deposi
Determination of Deuteron Beam Polarizations at COSY
The vector and tensor polarizations of a deuteron beam have been measured
using elastic deuteron-carbon scattering at 75.6 MeV and deuteron-proton
scattering at 270 MeV. After acceleration to 1170 MeV inside the COSY ring, the
polarizations of the deuterons were checked by studying a variety of nuclear
reactions using a cluster target at the ANKE magnet spectrometer placed at an
internal target position of the storage ring. All these measurements were
consistent with the absence of depolarization during acceleration and provide a
number of secondary standards that can be used in subsequent experiments at the
facility.Comment: 12 pages, 13 figure
CSF neurofilament light chain reflects corticospinal tract degeneration in ALS
Objective: Diffusion tensor imaging (DTI) is sensitive to white matter tract
pathology. A core signature involving the corticospinal tracts (CSTs) has been
identified in amyotrophic lateral sclerosis (ALS). Raised neurofilament light
chain protein (NfL) in cerebrospinal fluid (CSF) is thought to reflect axonal
damage in a range of neurological disorders. The relationship between these
two measures was explored. Methods: CSF and serum NfL concentrations and
DTI acquired at 3 Tesla on the same day were obtained from ALS patients
(n = 25 CSF, 40 serum) and healthy, age-similar controls (n = 17 CSF, 25
serum). Within-group correlations between NfL and DTI measures of microstructural integrity in major white matter tracts (CSTs, superior longitudinal
fasciculi [SLF], and corpus callosum) were performed using tract-based spatial
statistics. Results: NfL levels were higher in patients compared to controls. CSF
levels correlated with clinical upper motor neuron burden and rate of disease
progression. Higher NfL levels were significantly associated with lower DTI
fractional anisotropy and increased radial diffusivity in the CSTs of ALS
patients, but not in controls. Interpretation: Elevated CSF and serum NfL is, in
part, a result of CST degeneration in ALS. This highlights the wider potential
for combining neurochemical and neuroimaging-based biomarkers in neurological disease.The project was funded by The Motor Neurone Disease Association (Malaspina/ Apr13/6097), Barts and The London Charities (468/1714). The Oxford MND Centre (M. R. T., K. T.) receives funding from the Motor Neurone Disease Association U. K. M. R. T. is funded by the Medical Research Council & Motor Neurone Disease Association Lady Edith Wolfson Fellowship (G0701923 and MR/K01014X/1), and E. G. through the PROMISES project award to M. R. T. by the Thierry Latran Foundation. J. K. is funded by an ECTRIMS Research Fellowship Programme and by the Research Funds of the University of Basel, Switzerland
Local Hadronic Calibration
The scheme of the hadronic calibration is discussed. Based on the cluster reconstruction an effective noise suppression is achieved. In a first step clusters are classified as electromagnetic or hadronic clusters. The weighting scheme to correct for the different e/pion response in the ATLAS calorimeter is presented. Dead material corrections and out of cluster corrections yield finally a signal which is rather close to the energy deposited by the final state particles in the ATLAS calorimeter. The constants and algorithms are derived from single pion MC studies and tested with jets. The validation of the scheme using testbeam data is presented as well
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