559 research outputs found
Determination of changes in pebble sphericity and roundness in a downstream direction in Clear Creek, Fairfield -- Hocking Counties, Ohio
Evaluation of the data obtained is used to show the relationships between roundness and sphericity of pebbles and the distance downstream these pebbles were collected, with lithology of the pebbles and glacial boundaries crossed by the stream taken into account. Evaluations are based on data taken from sixteen locations on Clear Creek and one location on the Hocking River in Fairfield-Hocking Counties, Ohio.No embarg
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Controlled hydrothermal processing
Production of alkanes from an alkyl bound to a heteroatom under controlled hydrothermal conditions at supercritical or near critical water conditions including the use of an additive. The method reduces the extent of oxidation, generates useful and recoverable products, alters product distributions, promotes product yield, and enhances reaction rates. Additives alter product distributions and neutralize or consume mineral acids.Board of Regents, University of Texas Syste
Atomic layer deposition of titanium nitride for quantum circuits
Superconducting thin films with high intrinsic kinetic inductance are of
great importance for photon detectors, achieving strong coupling in hybrid
systems, and protected qubits. We report on the performance of titanium nitride
resonators, patterned on thin films (9-110 nm) grown by atomic layer
deposition, with sheet inductances of up to 234 pH/square. For films thicker
than 14 nm, quality factors measured in the quantum regime range from 0.4 to
1.0 million and are likely limited by dielectric two-level systems.
Additionally, we show characteristic impedances up to 28 kOhm, with no
significant degradation of the internal quality factor as the impedance
increases. These high impedances correspond to an increased single photon
coupling strength of 24 times compared to a 50 Ohm resonator, transformative
for hybrid quantum systems and quantum sensing.Comment: 10 pages, 8 figures including supplemental material
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Integrating GIS with Benthic Metrics: Calibrating a Biotic Index to Effectively Discriminate Stream Impacts in Urban Areas of the Blackland Prairie Eco-Region
Rapid Bioassessment Protocols integrate a suite of community, population, and functional metrics, determined from the collection of benthic macroinvertebrates or fish, into a single assessment. This study was conducted in Dallas County Texas, an area located in the blackland prairie eco-region that is semi-arid and densely populated. The objectives of this research were to identify reference streams and propose a set of metrics that are best able to discriminate between differences in community structure due to natural variability from those caused by changes in water quality due to watershed impacts. Using geographic information systems, a total of nine watersheds, each representing a different mix of land uses, were chosen for evaluation. A total of 30 metrics commonly used in RBP protocols were calculated. Efficacy of these metrics to distinguish change was determined using several statistical techniques. Ten metrics were used to classify study area watersheds according to stream quality. Many trends, such as taxa presence along habitat quality gradients, were observed. These gradients coincided with expected responses of stream communities to landscape and habitat variables
Quantum Fields on the Groenewold-Moyal Plane
We give an introductory review of quantum physics on the noncommutative
spacetime called the Groenewold-Moyal plane. Basic ideas like star products,
twisted statistics, second quantized fields and discrete symmetries are
discussed. We also outline some of the recent developments in these fields and
mention where one can search for experimental signals.Comment: 50 pages, 3 figures. v2: published versio
Magnetic resonance imaging correlates of neuro-axonal pathology in the MS spinal cord.
In people with multiple sclerosis (MS), the spinal cord is the structure most commonly affected by clinically detectable pathology at presentation, and a key part of the central nervous system involved in chronic disease deterioration. Indices, such as the spinal cord cross-sectional area at the level C2 have been developed as tools to predict future disability, and-by inference-axonal loss. However, this and other histo-pathological correlates of spinal cord magnetic resonance imaging (MRI) changes in MS remain incompletely understood. In recent years, there has been a surge of interest in developing quantitative MRI tools to measure specific tissue features, including axonal density, myelin content, neurite density, and orientation, among others, with an emphasis on the spinal cord. Quantitative MRI techniques including T1 and T2 , magnetization transfer and a number of diffusion-derived indices have all been applied to MS spinal cord. Particularly diffusion-based MRI techniques combined with microscopic resolution achievable using high magnetic field scanners enable a new level of anatomical detail and quantification of indices that are clinically meaningful.Barts Charity (grants # 468/1506 & G‐001109
Tegaserod Treatment for Dysmotility-Like Functional Dyspepsia: Results of Two Randomized, Controlled Trials
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/74639/1/j.1572-0241.2008.01953.x.pd
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