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“An experimental characterization of the abrasive wear behavior of clay and clay plus short carbon fiber filled polyamide66/polypropylene (PA66/PP) nanocomposites has been investigated. Two-body abrasive wear studies were carried out using pin-on-disc wear tester under multi-pass condition against the water proof silicon carbide abrasive paper. It was observed that the

clay reinforcement is detrimental to the abrasive wear resistance of PA66/PP blend. A combination of clay and short carbon fiber in PA66/PP blend improved the abrasive wear performance than those of 17DMAG order clay filled PA66/PP nanocomposites. Further, on the basis of microscopic observation of the worn surfaces, dominant wear mechanisms were discussed. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119:2292-2301, 2011″
“We report Mizoribine manufacturer on extremely sensitive measurements of changes in the microwave properties of high purity nonintentionally-doped single-crystal semiconductor samples of gallium phosphide, gallium arsenide, and 4H-silicon carbide when illuminated with light of different wavelengths at cryogenic temperatures. Whispering gallery modes were excited in the semiconductors while they were cooled on the coldfinger of a single-stage cryocooler and their frequencies and Q-factors measured under light and dark conditions.

With these materials, the whispering gallery mode technique is able to resolve changes of a few parts per million in the permittivity and the microwave losses as compared with those measured in darkness. A phenomenological model is proposed to explain the observed changes, which result not from direct valence to conduction band transitions but from detrapping and retrapping of carriers from impurity/defect sites with ionization energies that lay in the semiconductor band gap. Detrapping and retrapping relaxation times have been evaluated from comparison with measured data. (C) 2010 American Institute of Physics. [doi:10.1063/1.3514009]“
“Recent studies suggest strong interactions between cerebrovascular and Alzheimer’s disease (AD) pathology. These conditions share common risk

factors and individuals having both frequently show greater cognitive impairment than those affected by only one disease. Many studies point to early see more vascular dysregulations in AD. The exchange between vascular and neural cells occurs through mechanisms not completely understood, involving interactions among endothelial, glial, neuronal and smooth muscle cells within the neurovascular unit. Studies suggest that the dysregulation of the unit is likely associated with hypertension and other systemic diseases. Associations between hypertension and cognitive decline are not established, but other variables associated with hypertension could create a causal link. Many studies have lacked a consistent, quantitative neuropsychological approach for assessing cognitive functions.