1,527 research outputs found
Corner effects on the perturbation of an electric potential
We consider the perturbation of an electric potential due to an insulating
inclusion with corners. This perturbation is known to admit a multipole
expansion whose coefficients are linear combinations of generalized
polarization tensors. We define new geometric factors of a simple planar domain
in terms of a conformal mapping associated with the domain. The geometric
factors share properties of the generalized polarization tensors and are the
Fourier series coefficients of a kind of generalized external angle of the
inclusion boundary. Since the generalized external angle contains the Dirac
delta singularity at corner points, we can determine the criterion for the
existence of corner points on the inclusion boundary in terms of the geometric
factors. We illustrate and validate our results with numerical examples
computed to a high degree of precision using integral equation techniques,
Nystr\"om discretization, and recursively compressed inverse preconditioning.Comment: 25 pages, 6 figure
Protein Kinase C-Regulated AĪ² Production and Clearance
Alzheimer's disease (AD) is the most common form of dementia among the elderly population. AD, which is characterized as a disease of cognitive deficits, is mainly associated with an increase of amyloid Ī²-peptide (AĪ²) in the brain. A growing body of recent studies suggests that protein kinase C (PKC) promotes the production of the secretory form of amyloid precursor protein (sAPPĪ±) via the activation of Ī±-secretase activity, which reduces the accumulation of pathogenic AĪ² levels in the brain. Moreover, activation of PKCĪ± and mitogen-activated protein kinase (MAPK) is known to increase sAPPĪ±. A novel type of PKC, PKCĪµ, activates the AĪ² degrading activity of endothelin converting enzyme type 1 (ECE-1), which might be mediated via the MAPK pathway as well. Furthermore, dysregulation of PKC-MAPK signaling is known to increase AĪ² levels in the brain, which results in AD phenotypes. Here, we discuss roles of PKC in AĪ² production and clearance and its implication in AD
The Determinants of Adult Education and Training Participation in the US: A Machine Learning Approach
This study aims to explore the determinants of adult education and training (AET) participation of working adults. Through random forest analysis, we discovered important factors contributing to AET participation
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