Inviting students to determine for themselves what it means to write across the disciplines

Situated in the literature on threshold concepts and transfer of prior knowledge in WAC/WID and composition studies, with particular emphasis on the scholarship of writing across difference, our article explores the possibility of re-envisioning the role of the composition classroom within the broader literacy ecology of colleges and universities largely comprised of students from socioeconomically and ethno- linguistically underrepresented communities. We recount the pilot of a composi- tion course prompting students to examine their own prior and other literacy values and practices, then transfer that growing meta-awareness to the critical acquisition of academic discourse. Our analysis of students’ self-assessment memos reveals that students apply certain threshold concepts to acquire critical agency as academic writ- ers, and in a manner consistent with Guerra’s concept of transcultural repositioning. We further consider the role collective rubric development plays as a critical incident facilitating transcultural repositioning

A Ulysses Detection of Secondary Helium Neutrals

The Interstellar Boundary EXplorer (IBEX) mission has recently studied the flow of interstellar neutral He atoms through the solar system, and discovered the existence of a secondary He flow likely originating in the outer heliosheath. We find evidence for this secondary component in Ulysses data. By coadding hundreds of Ulysses He beam maps together to maximize signal-to-noise, we identify a weak signal that is credibly associated with the secondary component. Assuming a laminar flow from infinity, we infer the following He flow parameters: V=12.8+/-1.9 km/s, lambda=74.4+/-1.8 deg, beta=-10.5+/-4.1 deg, and T=3000+/-1100 K; where lambda and beta are the ecliptic longitude and latitude direction in J2000 coordinates. The secondary component has a density that is 4.9+/-0.9% that of the primary component. These measurements are reasonably consistent with measurements from IBEX, with the exception of temperature, where our temperature is much lower than IBEX's T=9500 K. Even the higher IBEX temperature is suspiciously low compared to expectactions for the outer heliosheath source region. The implausibly low temperatures are due to the incorrect assumption of a laminar flow instead of a diverging one, given that the flow in the outer heliosheath source region will be deflecting around the heliopause. As for why the IBEX and Ulysses T values are different, difficulties with background subtraction in the Ulysses data are a potential source of concern, but the discrepancy may also be another effect of the improper laminar flow assumption, which could affect the IBEX and Ulysses analyses differently.Comment: 9 pages, 4 figures, to appear in The Astrophysical Journa

Revisiting Ulysses Observations of Interstellar Helium

We report the results of a comprehensive reanalysis of Ulysses observations of interstellar He atoms flowing through the solar system, the goal being to reassess the interstellar He flow vector and to search for evidence of variability in this vector. We find no evidence that the He beam seen by Ulysses changes at all from 1994-2007. The direction of flow changes by no more than ~0.3 deg and the speed by no more than ~0.3 km/s. A global fit to all acceptable He beam maps from 1994-2007 yields the following He flow parameters: V_ISM=26.08+/-0.21 km/s, lambda=75.54+/-0.19 deg, beta=-5.44+/-0.24 deg, and T=7260+/-270 K; where lambda and beta are the ecliptic longitude and latitude direction in J2000 coordinates. The flow vector is consistent with the original analysis of the Ulysses team, but our temperature is significantly higher. The higher temperature somewhat mitigates a discrepancy that exists in the He flow parameters measured by Ulysses and the Interstellar Boundary Explorer, but does not resolve it entirely. Using a novel technique to infer photoionization loss rates directly from Ulysses data, we estimate a density of n_He=0.0196+/-0.0033 cm^-3 in the interstellar medium.Comment: to appear in The Astrophysical Journa

A Think Tank on the Left: The Institute for Policy Studies and Cold War America, 1963-1989

For American intellectuals, the Cold War involved a battle far more important than the ones taking place in faraway lands. While the nearly half-decade conflict never degenerated into a nuclear war, the combat between intellectuals resembled a nuclear explosion at times. Participants in the war of words believed that intellectual debates would determine the direction of American foreign policy, and possibly whether the United States survived the Cold War. Led by groups such as the Americans for Democratic Action, liberal intellectuals held the dominant position during the first decades of the Cold War as they became hardened Cold Warriors intent on containing the Communist menace. By the late 1960s, however, the liberal consensus collapsed under the pressure of the Vietnam War. This dissertation looks at the instrumental role played by the Institute for Policy Studies (IPS), a leftist think tank located in Washington D.C., in causing the breakup of the liberal consensus, as well as the Institute’s attempt to restore liberalism to its true form. From the time that IPS opened its doors in 1963 until the end of the Cold War in 1989, the Institute served as the guardian of a genuine liberalism corrupted by the actions undertaken by liberals in pursuit of victory in the Cold War. Analyzing the intellectual contributions of the activists and writers associated with IPS from 1963 until the end of the Cold War, this dissertation probes a heretofore unexamined set of ideas regarding liberalism, democracy, and American foreign policy. Given life just as a New Left came into being in America, IPS carried forth the ideals of groups like Students for a Democratic Society by calling for a non-interventionist and non-ideological foreign policy, greater participatory democracy, and a more moral and humane world. Thus, despite the demise of liberalism and the concomitant rise of conservatism, a more progressive form of liberalism survived at IPS. At the same time, this study demonstrates the inherent difficulties facing intellectuals trying to influence policymakers, particularly when offering a progressive vision for America at home and abroad in a conservative climate. Drawing upon the think tank’s records and the expansive writings of IPS intellectuals, this study reveals the ways in which the think tank kept alive the promise of a reconstructed liberalism in Cold War America

Nationalism, Self-Determination, and Empire

Daniel Immerwahr, How to Hide an Empire: A History of the Greater United States (New York: Farrar, Straus and Giroux, 2019). 516 pp. Hardcover. Adom Getachew, Worldmaking After Empire: The Rise and Fall of Self-Determination (Princeton: Princeton University Press, 2019). 288 pp. Hardcover. Natasha Zaretsky, Radiation Nation: Three Mile Island and the Political Transformation of the 1970s (New York: Columbia University Press, 2018). 312 pp. Paperback

Visual Acceleration Perception for Simple and Complex Motion Patterns.

Humans are able to judge whether a target is accelerating in many viewing contexts, but it is an open question how the motion pattern per se affects visual acceleration perception. We measured acceleration and deceleration detection using patterns of random dots with horizontal (simpler) or radial motion (more visually complex). The results suggest that we detect acceleration better when viewing radial optic flow than horizontal translation. However, the direction within each type of pattern has no effect on performance and observers detect acceleration and deceleration similarly within each condition. We conclude that sensitivity to the presence of acceleration is generally higher for more complex patterns, regardless of the direction within each type of pattern or the sign of acceleration

Climate variability and inter-provincial migration in South America, 1970–2011

We examine the effect of climate variability on human migration in South America. Our analyses draw on over 21 million observations of adults aged 15-40 from 25 censuses conducted in eight South American countries. Addressing limitations associated with methodological diversity among prior studies, we apply a common analytic approach and uniform definitions of migration and climate across all countries. We estimate the effects of climate variability on migration overall and also investigate heterogeneity across sex, age, and socioeconomic groups, across countries, and across historical climate conditions. We also disaggregate migration by the rural/urban status of destination. We find that exposure to monthly temperature shocks has the most consistent effects on migration relative to monthly rainfall shocks and gradual changes in climate over multi-year periods. We also find evidence of heterogeneity across demographic groups and countries. Analyses that disaggregate migration by the rural/urban status of destination suggest that much of the climate-related inter-province migration is directed toward urban areas. Overall, our results underscore the complexity of environment-migration linkages and challenge simplistic narratives that envision a linear and monolithic migratory response to changing climates

Rise in Malaria Incidence Rates in South Africa: A Small-Area Spatial Analysis of Variation in Time Trends

Using Bayesian statistical models, the authors investigated spatial and temporal variations in small-area malaria incidence rates for the period mid-1986 to mid-1999 for two districts in northern KwaZulu Natal, South Africa. Maps of spatially smoothed incidence rates at different time points and spatially smoothed time trends in incidence gave a visual impression of the highest increase in incidence occurring where incidence rates previously had been lowest. This was confirmed by conditional autoregressive models, which showed that there was a significant negative association between time trends and smoothed baseline incidence before the steady rise in caseloads began. Growth rates also appeared to be higher in the areas close to the Mozambican border. The main findings of this analysis were that: 1) the spatial distribution of the rise in malaria incidence is uneven and strongly suggests a geographic expansion of high-malaria-risk areas; 2) there is evidence of a stabilization of incidence in areas that had the highest rates before the current escalation of rates began; and 3) areas immediately adjoining the Mozambican border appear to have undergone larger increases in incidence, in contrast to the general pattern of low growth in the more northern, high-baseline-incidence areas, but this was not confirmed by modeling. Smoothing of small-area maps of incidence and growth in incidence (trend) is important for interpretation of the spatial distribution of disease incidence and the spatial distribution of rapid changes in disease incidenc