3,379 research outputs found
A Model for Conductive Percolation in Ordered Nanowire Arrays
The combined processes of anodization and electrodeposition lead to highly
ordered arrays of cylindrical nanowires. This template-based self-assembly
fabrication method yields nanowires embedded in alumina. Commonly, chemical
etching is used to remove the alumina and free the nanowires. However, it has
been experimentally observed during the etching process that the nanowires tend
to form clumps. In this work, the nanowires are modeled as elastic rods subject
to surface interaction forces. The dynamics of the model give rise to the
aforementioned clumping behavior which is studied via percolation theory. This
work finds that percolation takes place with probability ,
where the exponent and is the time at which percolation takes
place. The critical exponents which entirely determine the system are found to
be for (dimension) , and .Comment: 5 pages, 8 figure
More advanced Alzheimer's disease may be associated with a decrease in cerebrospinal fluid pressure
In a recent article, elevated cerebrospinal fluid pressure (CSFP) consistent with very early normal pressure hydrocephalus (NPH), was found in a small subset of Alzheimer's disease (AD) patients (possible AD-NPH hybrids) enrolled in a clinical trial for chronic low-flow cerebrospinal fluid drainage. Also in the same study, was another interesting finding that merits further discussion: a substantial proportion of AD patients had very low CSFP. Based on the characteristics of these subjects, we hypothesize that more advanced AD may be associated with a decrease in CSFP. Reduced CSFP among a group of AD patients could provide a clue towards a better understanding of the high rate of comorbidity reported between AD and glaucoma since it has been shown that mean CSFP is lower in subjects with primary open-angle glaucoma. This could result in an abnormally high trans-lamina cribrosa pressure difference and lead to glaucomatous damage
Crystal structure of N-[(2S,5R)-4-oxo-2,3-diphenyl-1,3-thiazinan-5-yl]acetamide 0.375-hydrate
Acknowledgements We acknowledge NSF funding (CHEM-0131112) for the X-ray diffractometer. We also express gratitude to Euticals for the gift of T3P in 2-methyltetrahydrofuran, and to Oakwood Products for the gift of N-acetyl-L-cysteine.Peer reviewedPublisher PD
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