Topological fluid mechanics of point vortex motions

Topological techniques are used to study the motions of systems of point vortices in the infinite plane, in singly-periodic arrays, and in doubly-periodic lattices. The reduction of each system using its symmetries is described in detail. Restricting to three vortices with zero net circulation, each reduced system is described by a one degree of freedom Hamiltonian. The phase portrait of this reduced system is subdivided into regimes using the separatrix motions, and a braid representing the topology of all vortex motions in each regime is computed. This braid also describes the isotopy class of the advection homeomorphism induced by the vortex motion. The Thurston-Nielsen theory is then used to analyse these isotopy classes, and in certain cases strong conclusions about the dynamics of the advection can be made

Better Together: An Analysis of Public Participation in Flower Mound, Texas

Public participation has become a buzzword among planners and local officials in the past few decades as citizens demand more transparency and involvement in local matters. This study analyzes the existing condition in Flower Mound based on the CLEAR toolkit developed by the European Committee for Local and Regional Democracy, supplemented by the Town of Flower Mound Resident Survey. The audit evaluates the 5 elements- Can do, Like to, Enabled to, Asked to, and Responded to- that support vibrant public engagement.Ope

Local Climatological Data, 1901-1962 : Hillsboro

Hillsboro is a farming and commercial center and the county seat of Montgomery County. The surrounding area is part of the Springfield Plain Physiographic Section. The topography is generally flat with broad, shallow valleys. The topography has no effect on the weather and climate of the Hillsboro area.published or submitted for publicationis peer reviewedOpe

Selecting Research Collections for Digitization: Applying the Harvard Model

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Introduction to Library Trends 48 (4) 2000: Collection Development in an Electronic Environment

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The landscape and mineral resources of Illinois

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Technology: Servant or Master of the Online Teacher?

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Single-molecule microscopy of nanocatalysis

Nanoparticles are important catalysts. Understanding their structure-activity correlation is paramount for developing better catalysts, but hampered by their inherent inhomogeneity: individual nanoparticles differ from one to another, and for every nanoparticle, it can change from time to time, especially during catalysis. Furthermore, each nanoparticle presents on its surface various types of sites, which are often unequal in catalytic activity. I will present our work of using single-molecule fluorescence microscopy to overcome these challenges and study single-nanoparticle catalysis at the single-turnover resolution and nanometer precision. I will present how we interrogate the catalytic activity and dynamics of individual metal nanoparticles, map the reactivity of different surface sites, and uncover surprising spatial reactivity patterns within single facets at the nanoscale. This spatiotemporally resolved catalysis mapping also enables us to probe the communication between catalytic reactions at different locations on a single nanocatalyst, in much relation to allosteric effects in enzymes.Ope

A Preliminary Report on Unique Hail and Tornadic Storm Observations in Central Illinois and Eastern Indiana on 3 April 1974

published or submitted for publicationis peer reviewedOpe

Waterfowl Harvest and Hunter Use at Carlyle Lake During the 1972 Season

Division of Wildlife Resources Migratory Bird Section, Periodic Report No. 1Report issued on: March 26, 197