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Evolution in range expansions with competition at rough boundaries.
J Theor Biol
October 2019
Department of Physics, University of California, Merced, CA 95343, USA. Electronic address:
When a biological population expands into new territory, genetic drift develops an enormous influence on evolution at the propagating front. In such range expansion processes, fluctuations in allele frequencies occur through stochastic spatial wandering of both genetic lineages and the boundaries between genetically segregated sectors. Laboratory experiments on microbial range expansions have shown that this stochastic wandering, transverse to the front, is superdiffusive due to the front's growing roughness, implying much faster loss of genetic diversity than predicted by simple flat front diffusive models.
View Article and Find Full Text PDFQuantitative and Atomic-Scale View of CO-Induced Pt Nanoparticle Surface Reconstruction at Saturation Coverage via DFT Calculations Coupled with in Situ TEM and IR.
J Am Chem Soc
March 2017
Department of Chemical and Environmental Engineering, ⊥Program in Materials Science and Engineering, and #UCR Center for Catalysis, University of California Riverside, Riverside, California 92521, United States.
Atomic-scale insights into how supported metal nanoparticles catalyze chemical reactions are critical for the optimization of chemical conversion processes. It is well-known that different geometric configurations of surface atoms on supported metal nanoparticles have different catalytic reactivity and that the adsorption of reactive species can cause reconstruction of metal surfaces. Thus, characterizing metallic surface structures under reaction conditions at atomic scale is critical for understanding reactivity.
View Article and Find Full Text PDFReproducibly creating hierarchical 3D carbon to study the effect of Si surface functionalization on the oxygen reduction reaction.
Nanoscale
June 2016
School of Engineering, University of California, Merced, 5200 North Lake Road, Merced, CA 95343, USA.
We report a new method to reproducibly fabricate functional 3D carbon structures directly on a current collector, e.g. stainless steel.
View Article and Find Full Text PDFThermal Evolution and Instability of CO-Induced Platinum Clusters on the Pt(557) Surface at Ambient Pressure.
J Am Chem Soc
February 2016
Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon 34141, Republic of Korea.
Carbon monoxide (CO) is one of the most-studied molecules among the many modern industrial chemical reactions available. Following the Langmuir-Hinshelwood mechanism, CO conversion starts with adsorption on a catalyst surface, which is a crucially important stage in the kinetics of the catalytic reaction. Stepped surfaces show enhanced catalytic activity because they, by nature, have dense active sites.
View Article and Find Full Text PDFPhase-field model for reconstructed stepped surface.
Phys Rev E Stat Nonlin Soft Matter Phys
July 2013
Department of Mathematics, University of Maryland, College Park, Maryland 20742, USA.
We formulate a phase-field, or diffuse-interface, model for the evolution of stepped surfaces under surface diffusion in the presence of distinct material parameters across nanoscale terraces. In the sharp-interface limit, our model reduces to a Burton-Cabrera-Frank (BCF)-type theory for the motion of noninteracting steps separating inhomogeneous terraces. This setting aims to capture features of reconstructed semiconductor, e.
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