Writing the bicycle: women, rhetoric, and technology in late nineteenth-century America

This project examines the intersections among rhetoric, gender, and technology, examining in particular the ways that American women appropriated the new technology of the bicycle at the turn of the twentieth century. It asks: how are technologies shaped by discourse that emanates both from within and beyond professional boundaries? In what ways do technologies, in turn, reshape the social networks in which they emerge--making available new arguments and rendering others less persuasive? And to what extent are these arguments furthered by the changed conditions of embodiment and materiality that new technologies often initiate? Writing the Bicycle: Women, Rhetoric and Technology in Late Nineteenth-Century America addresses these questions by considering how women's interactions with the bicycle allowed them to make new claims about their minds and bodies, and transformed the gender order in the process. The introduction, Rhetoric, Gender, Technology, provides an overview of the three broad conversations to which the project primarily contributes: science and technology studies, feminist historiography, and rhetorical theory. In addition, it outlines a techno-feminist materialist methodology that emphasizes the material and rhetorical agency of users in shaping technologies beyond their initial design and distribution phases. The second chapter, Technology and the Rhetoric of Bicycle Design, describes the context in which the bicycle craze emerged and explains how the popular safety model responded to users' concerns about its predecessor, the high wheeled ordinary bicycle. The third chapter, Popular Magazines and the Rise of the Woman Bicyclist, offers a glimpse at a genre that generated both wider acceptance of the new technology and specific prescriptions as to how it might be useful to women. Finally, the fourth and fifth chapters--titled, respectively, Bicycling and the Invention of Women's Athletic Dress and The Medical Bicycle --examine two discourses that shaped the women's bicycling phenomenon, both rhetorically and materially, and that were in turn transformed by this phenomenon: the heated issues of women's dress reform and women's health

Ice Lines, Planetesimal Composition and Solid Surface Density in the Solar Nebula

To date, there is no core accretion simulation that can successfully account for the formation of Uranus or Neptune within the observed 2-3 Myr lifetimes of protoplanetary disks. Since solid accretion rate is directly proportional to the available planetesimal surface density, one way to speed up planet formation is to take a full accounting of all the planetesimal-forming solids present in the solar nebula. By combining a viscously evolving protostellar disk with a kinetic model of ice formation, we calculate the solid surface density in the solar nebula as a function of heliocentric distance and time. We find three effects that strongly favor giant planet formation: (1) a decretion flow that brings mass from the inner solar nebula to the giant planet-forming region, (2) recent lab results (Collings et al. 2004) showing that the ammonia and water ice lines should coincide, and (3) the presence of a substantial amount of methane ice in the trans-Saturnian region. Our results show higher solid surface densities than assumed in the core accretion models of Pollack et al. (1996) by a factor of 3 to 4 throughout the trans-Saturnian region. We also discuss the location of ice lines and their movement through the solar nebula, and provide new constraints on the possible initial disk configurations from gravitational stability arguments.Comment: Version 2: reflects lead author's name and affiliation change, contains minor changes to text from version 1. 12 figures, 7 tables, accepted for publication in Icaru

The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function

We present a current catalog of 21 cm HI line sources extracted from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey over ~2800 square degrees of sky: the alpha.40 catalog. Covering 40% of the final survey area, the alpha.40 catalog contains 15855 sources in the regions 07h30m < R.A. < 16h30m, +04 deg < Dec. < +16 deg and +24 deg < Dec. < +28 deg and 22h < R.A. < 03h, +14 deg < Dec. < +16 deg and +24 deg < Dec. < +32 deg. Of those, 15041 are certainly extragalactic, yielding a source density of 5.3 galaxies per square degree, a factor of 29 improvement over the catalog extracted from the HI Parkes All Sky Survey. In addition to the source centroid positions, HI line flux densities, recessional velocities and line widths, the catalog includes the coordinates of the most probable optical counterpart of each HI line detection, and a separate compilation provides a crossmatch to identifications given in the photometric and spectroscopic catalogs associated with the Sloan Digital Sky Survey Data Release 7. Fewer than 2% of the extragalactic HI line sources cannot be identified with a feasible optical counterpart; some of those may be rare OH megamasers at 0.16 < z < 0.25. A detailed analysis is presented of the completeness, width dependent sensitivity function and bias inherent in the current alpha.40 catalog. The impact of survey selection, distance errors, current volume coverage and local large scale structure on the derivation of the HI mass function is assessed. While alpha.40 does not yet provide a completely representative sampling of cosmological volume, derivations of the HI mass function using future data releases from ALFALFA will further improve both statistical and systematic uncertainties.Comment: 62 pages, 28 figures. See http://egg.astro.cornell.edu/alfalfa/data for ASCII and CSV datafiles corresponding to Tables 1, 2 and 3. A higher resolution PDF version can be found at http://egg.astro.cornell.edu/alfalfa/pubs.php. To appear in Nov 2011 Astron.

Decolonizing cascadia?

This essay reflects on attempts to organize a conference that sought to trouble the colonial nature of conference structures, academic knowledges and hierarchies, and the ‘Cascadia’ bioregion of Northwestern North America