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Potential for Novel Magnetic Structures by Nanowire Growth Mechanisms
R. R. LaPierre,M. C. Plante 한국자기학회 2005 Journal of Magnetics Vol.10 No.3
GaAs nanowires were grown on GaAs (111)B substrates in a gas source molecular beam epitaxy system, using self-assembled Au particles with diameters between 25 and 200 ㎚ as the catalytic agents. The growth rate and structure of the nanowires were investigated for substrate temperatures between 500 and 600 ℃ to study the mass transport mechanisms that drive the growth of these crystals. The possibilities for fabrication of novel magnetic nanostructures by suitable choice of growth conditions are discussed.
Periodic Solutions of a System of Piecewise Linear Difference Equations
Tikjha, Wirot,Lapierre, Evelina Department of Mathematics 2020 Kyungpook mathematical journal Vol.60 No.2
In this article we consider the following system of piecewise linear difference equations: x<sub>n+1</sub> = |x<sub>n</sub>| - y<sub>n</sub> - 1 and y<sub>n+1</sub> = x<sub>n</sub> + |y<sub>n</sub>| - 1. We show that when the initial condition is an element of the closed second or fourth quadrant the solution to the system is either a prime period-3 solution or one of two prime period-4 solutions.
Choi, E.,Petersen, C.P.,Lapierre, L.A.,Williams, J.A.,Weis, V.G.,Goldenring, J.R.,Nam, K.T. American Association of Pathologists and Bacteriol 2015 The American journal of pathology Vol.185 No.8
Doublecortin-like kinase 1 (Dclk1) is considered a reliable marker for tuft cells in the gastrointestinal tract. We investigated the dynamic changes of tuft cells associated with mouse models of oxyntic atrophy and metaplasia in the stomach. Increases in the numbers of Dclk1-positive tuft cells were observed in several models of parietal cell loss. However, the expanded population of Dclk1-expressing cells showed a morphologically distinct structure in apical microvilli and acetylated microtubules, which was not seen in the tuft cells present in the normal gastric mucosa. These microvillar sensory cells (MVSCs) showed no evidence of proliferation. The expansion of the MVSCs induced by oxyntic atrophy was reversible after the return of parietal cells. More important, expansion of MVSCs after induced parietal cell loss was not observed in Gast<SUP>-/-</SUP> mice. Although the Dclk1-expressing cells in the normal gastric mucosa were in part derived from Lrig1-expressing stem cells, the Lrig1-lineaged cells did not produce the expanded Dclk1-expressing cells associated with oxyntic atrophy. These studies indicate that loss of parietal cells leads to the reversible emergence of a novel Dclk1-expressing sensory cell population in the gastric mucosa.
On the Role of Chromium in Dynamic Transformation of Austenite
K. Chadha,Davood Shahriari,C. Jr. Aranas,Louis‑Philippe Lapierre‑Boire,Mohammad Jahazi 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The effect of Chromium (Cr) on the dynamic transformation (DT) of austenite to ferrite at temperatures up to 430 °C aboveAe3was studied in a medium-carbon low-alloy steel. Hot compression tests were performed using Gleeble 3800® thermomechanicalsimulator followed by microstructural examinations using electron microscopy (FESEM-EBSD). Driving forcecalculation using austenite flow stress and ferrite yield stress on an inverse absolute temperature graph indicated that Crincreases the driving force for the transformation of austenite to ferrite; however, when the influence of stress and thermodynamicanalysis are taken into account, it was observed that Cr increases the barrier energy and therefore, emerges as abarrier to the transformation. An analysis, based on lattice and pipe diffusion theories is presented that quantifies the role ofstress on the diffusivity of Cr and is compared with other the main alloying elements such as C, Si and Mn and its impact,positive or negative, on the DT barrier energy. Finally, a comparison is made on the differential effects of temperature andstress on the initiation of DT in medium-carbon low-alloy steels.