201 Works

Chemical Abundance Verifiction of Candidate Omega Centauri Tidal Debris Stars

Joy Skipper
The Omega Centauri star system has several peculiar features that set it apart from other Milky Way globular clusters, such as its large mass, extended size, oblate shape, internal rotation, large age and metallicity spreads, and retrograde orbit. Because of these properties it is thought that Omega Cen may instead be a heavily stripped remnant of a Milky Way-captured dwarf spheroidal galaxy , now currently orbiting (backwards) near the Galactic plane (e.g., Lee et al....

Introduction to Mindfulness Practice for College and University Students: an Instructor’s Manual and Syllabus

Samuel Green
There are doubtless many effective ways to teach an introductory mindfulness practice class in a college or university setting. This is one of them. Mindfulness practice can only be taught from one’s own experience. My experience, as a student and a teacher, has come mainly through the MBSR Program developed by Jon Kabat-Zinn and described in detail in Full Catastrophe Living. It is not my purpose to restate or summarize that work. Rather, I would...

Poetic Data and the News in Poems: A *For Better for Verse* Memoir

Herbert Tucker
This essay introduces scholars of Victorian poetry to an open-access, on-line scansion tutorial developed at my initiative and maintained under my guidance by the Scholars' Lab at the University of Virginia. I explain what and whom it is for, how it works, and what sorts of issue arose during its development. I then go into the sort of issue that should matter most to journal readers, viz. freshly enabled understanding of the metrical structure of...

Consensus, Disorder, and Ideology on the Supreme Court

David Klein & Paul Edelman
Ideological models are widely accepted as the basis for many academic studies of the Supreme Court because of their power in predicting the justices’ decision making behavior. Not all votes are easily explained or well predicted by attitudes, however. Consensus in Supreme Court voting, particularly the extreme consensus of unanimity, has often puzzled Court observers who adhere to ideological accounts of judicial decision making. Are consensus and (ultimately) unanimity driven by extreme factual scenarios or...


Herbert Tucker

Dependence of Inner Accretion Disk Stress on Parameters: The Schwarzschild Case

John Hawley
We explore the parameter dependence of inner disk stress in black hole accretion by contrasting the results of a number of simulations, all employing three-dimensional general relativistic MHD in a Schwarzschild spacetime. Five of these simulations were performed with the intrinsically conservative code HARM3D, which allows careful regulation of the disk aspect ratio, H/R; our simulations span a range in H/R from 0.06 to 0.17. We contrast these simulations with two previously reported simulations in...

The Corrosion Crisis in Flint, Michigan: A Call for Improvements in Technology Stewardship

John Scully
The water contamination crisis in Flint, Michigan, vividly demonstrates that the current approach to technology stewardship in the face of problems that may lead to calamity is not working. Lessons often are tragically not learned or used during decision making. A more proactive approach to technology stewardship, risk assessment, and public policy practice is recommended, drawing on lessons from previous experiences and supporting timely, data-driven decisions and actions by well-informed authorities. Without such cultural and...

Just Google It: Young Children’s Preferences for Touchscreens versus Books in Hypothetical Learning Tasks

Sierra Eisen & Angeline Lillard
Children today regularly interact with touchscreen devices (Rideout, 2013) and thousands of “educational” mobile applications are marketed to them (Shuler, 2012). Understanding children’s own ideas about optimal learning has important implications for education, which is being transformed by electronic mobile devices, yet we know little about how children think about such devices, including what children think touchscreens are useful for. Based on a prior result that children prefer a book over a touchscreen for learning...

Using Mobile Sensing to Test Clinical Models of Depression, Social Anxiety, State Affect, and Social Isolation

Laura Barnes, Bethany Teachman, Philip Chow, Yu Huang, Haoyi Xiong, Wesley Bonelli & Karl Fua
Background: Research in psychology demonstrates a strong link between state affect (moment-to-moment experiences of positive or negative emotionality) and trait affect (eg, relatively enduring depression and social anxiety symptoms), and a tendency to withdraw (eg, spending time at home). However, existing work is based almost exclusively on static, self-reported descriptions of emotions and behavior that limit generalizability. Despite adoption of increasingly sophisticated research designs and technology (eg, mobile sensing using a global positioning system [GPS]),...

1990 AMS Library Survey

James Rovnyak & Nancy Anderson
In 1990 an ad hoc committee of the American Mathematical Society conducted a survey of mathematics research libraries in doctoral-granting institutions in the United States and Canada. This file contains the summary report and detailed final report with budget figures from that survey. A follow-up survey was done in 1996: http://libra.virginia.edu/catalog/libra-oa:697.

Mining the Time-Space Matrix: Commemorative Postage Stamps and US World's Fairs, 1893-1915

Richard Handler
This paper examines turn-of-the-twentieth-century United States world’s fairs and the postage stamps that were issued in their honor. The fairs celebrated the progress of industrial civilization, in part by anchoring themselves to a historical origin point (such as Columbus’ voyages), and the post office designed the accompanying stamps to commemorate a historical story deemed to be nationally significant. Both the origin point and the history associated with it were located within a time-space matrix defined...

Increasing Faculty Awareness of Open Access in 5 Minutes or Less

Ellen Ramsey
This paper provides ideas on increasing faculty awareness of scholarly communication issues.

The sensitivity and specificity of clinical measures of sport concussion: three tests are better than one

Jacob Resch
Context: A battery of clinical measures of neurocognition, balance and symptoms has been recommended for the management of sport concussion (SC) but is based on variable evidence. Objective: To examine the sensitivity and specificity of a battery of tests to assess SC in college athletes. Design: Cross-sectional. Setting: Research laboratory. Patients or other participants: Division 1 athletes diagnosed with a SC (n=40) who were 20.2±1.60 years of age and 180.5±11.12 cm tall and healthy athletes...

Risky Subjects: Insurance, Sexuality, and Capital

Geeta Patel
The essay investigates the production of "risky subjects" constituted through "life-finance" in South Asia. Focusing primarily on insurance as a technology of risk, the essay interrogates the ways in which risk has infiltrated daily life and capital been made quotidian through pedagogies, through commonalities, families and communities produced by risk pooling, through new notions of labor, through wellness programs, through shifts in ideas of governance, through new practices of farming. Turning to sexualized subjects such...

Resistivity-Driven State Changes in Vertically Stratified Accretion Disks

John Hawley, Jacob Simon & Kris Beckwith
We investigate the effect of shear viscosity, ν, and Ohmic resistivity, η, on the magnetorotational instability (MRI) in vertically stratified accretion disks through a series of local simulations with the Athena code. First, we use a series of unstratified simulations to calibrate physical dissipation as a function of resolution and background field strength; the effect of the magnetic Prandtl number, Pm = ν/η, on the turbulence is captured by ∼32 grid zones per disk scale...

Increased default mode network activity in socially anxious individuals during reward processing

Erin Maresh & Joseph Allen
Background Social anxiety has been associated with potentiated negative affect and, more recently, with diminished positive affect. It is unclear how these alterations in negative and positive affect are represented neurally in socially anxious individuals and, further, whether they generalize to non-social stimuli. To explore this, we used a monetary incentive paradigm to explore the association between social anxiety and both the anticipation and consumption of non-social incentives. Eighty-four individuals from a longitudinal community sample...

Virginia Goes Fer Gopher

Melinda Baumann

The HOPS/class C Vps complex tethers membranes by binding to one Rab GTPase in each apposed membrane

Ruoya Ho & Christopher Stroupe
Many Rab GTPase effectors are membrane-tethering factors, that is, they physically link two apposed membranes before intracellular membrane fusion. In this study, we investigate the distinct binding factors needed on apposed membranes for Rab effector– dependent tethering. We show that the homotypic fusion and protein-sorting/class C vacuole protein-sorting (HOPS/class C Vps) complex can tether low-curvature membranes, that is, liposomes with a diameter of ∼100 nm, only when the yeast vacuolar Rab GTPase Ypt7p is present...

Scale dependence of sex ratio in wild plant populations: implications for social selection

Brian Sanderson, Malcolm Augat, Douglas Taylor & Edmund Brodie
Social context refers to the composition of an individual’s social interactants, including potential mates. In spatially structured populations, social context can vary among individuals within populations, generating the opportunity for social selection to drive differences in fitness functions among individuals at a fine spatial scale. In sexually polymorphic plants, the local sex ratio varies at a fine scale and thus has the potential to generate this opportunity. We measured the spatial distribution of two wild populations of the gynodioecious plant Silene vulgaris...

Iteroparity in the Variable Environment of the Salamander Ambystoma tigrinum

Henry Wilbur, Don Church, Larissa Bailey & Jim Hines
Abstract. Simultaneous estimation of survival, reproduction, and movement is essential to understanding how species maximize lifetime reproduction in environments that vary across space and time. We conducted a four-year, capture–recapture study of three populations of eastern tiger salamanders (Ambystoma tigrinum tigrinum) and used multistate mark–recapture statistical methods to estimate the manner in which movement, survival, and breeding probabilities vary under different environmental conditions across years and among populations and habitats. We inferred how individuals may...

Freshwater savings from marine protein consumption

Jessica Gephart
Marine fisheries provide an essential source of protein for many people around the world. Unlike alternative terrestrial sources of protein, marine fish production requires little to no freshwater inputs. Consuming marine fish protein instead of terrestrial protein therefore represents freshwater savings (equivalent to an avoided water cost) and contributes to a low water footprint diet. These water savings are realized by the producers of alternative protein sources, rather than the consumers of marine protein. This...

Cellular Automata on the Micron Automata Processor

Ke Wang & Kevin Skadron
A cellular automaton (CA) is a well-studied and widely used time-evolving discrete model. CAs are studied in many fields of science, such as computability theory, mathematics, physics, complexity science, theoretical biology and microstructure modeling. Some CA models have been proven to be Turing Complete, such as the elementary cellular automaton (ECA) of Rule-110 and Conways Game of Life. Micron's Automata Processor (AP) is a hardware implementation of non-deterministic finite automata (NFAs). The core feature of...

Uninvited Guests

Bethany Nowviskie
Five considerations addressed and three strategies proposed, for the the use of social media systems like Twitter at invitation-only academic events.

A Field of Magpies: Disciplinary Emergence as Modus Vivendi in English Studies

Herbert Tucker
Our summons to draw “Lessons from the Past: The Emergence of University English” evokes, inescapably, some prominent institutional dimensions. These deserve such careful attention at present that I must acknowledge them in starting and, although the following discussion will chiefly trace out other dimensions of the topic, must return to them in closing as well. To the extent that “University English” involves matters such as organizational authority and clout, departmental viability and adaptation, the task...

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