Arrest of flow and emergence of activated processes at the glass transition of a suspension of particles with hard sphere-like interactions

By combining aspects of the coherent and self intermediate scattering functions, measured by dynamical light scattering on a suspension of hard sphere-like particles, we show that the arrest of particle number density fluctuations spreads from the position of the main structure factor peak. Taking the velocity auto-correlation function into account we propose that as density fluctuations are arrested the system's ability to respond to diffusing momentum currents is impaired and, accordingly, the viscosity increases. From the stretching of the coherent intermediate scattering function we read a quantitative manifestation of the undissipated thermal energy, the source of those, ergodicity restoring, processes that short-circuit the sharp transition to a perfect glass.Comment: 9 pages, 4 figure

A Case Study for Georgia Southwestern State University: The Discrepancies\u27 of Financial Aid Services that Impact Student Enrollment

At many traditional universities, the federal timelines for determining financial aid eligibility is based on releasing of the Free Application of Federal Student Aid each January, and the subsequent financial aid processing cycle July 1- June 30th. These federally established dates can conflict with traditional August class starts and creates a backlog and delayed processing of information that, in turn, hinders students from receiving timely information in order to make informed decisions based on financial aid awards. The purpose of this case study of a traditional university in Georgia was to apply net price theory and rational choice theory to evaluate the impact of timeline conflicts and how students make decisions about which institution to attend. Data consisted of internal documents, including the results of a prior survey of 425 freshmen, and 13 alumni focus group and survey participants. All data were inductively coded and analyzed using a constant comparative method to reveal key themes. Key findings indicated decision making by prospective students largely focused on accurate and timely communication and cost of attendance. One discrepant area was the decision maker\u27s ability to differentiate between cost of attendance and net price which impacted some student decisions to enroll. The findings are consistent with both net price and rational choice theory. Recommendations to university leaders include encouraging early communication to prospective students and retraining efforts for financial aid staff in order to meet regulatory demands and timelines, increase student enrollment, and reduce anxieties for potential students and families associated with the financial aid process. These outcomes enhance social change by potentially opening doors to higher education for new generations of students

Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare

We report on optical and infrared observations of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937, made during its ongoing X-ray flare which started in 2007 March. We detected the source in the optical I and near-infrared Ks bands in two ground-based observations and obtained deep flux upper limits from four observations, including one with the Spitzer Space Telescope at 4.5 and 8.0 microns. The detections indicate that the source was approximately 1.3--1.6 magnitudes brighter than in 2003--2006, when it was at the tail of a previous similar X-ray flare. Similar related flux variations have been seen in two other AXPs during their X-ray outbursts, suggesting common behavior for large X-ray flux variation events in AXPs. The Spitzer flux 1E 1048.1-5937 limits are sufficiently deep that we can exclude mid-infrared emission similar to that from the AXP 4U 0142+61, which has been interpreted as arising from a dust disk around the AXP. The optical/near-infrared emission from probably has a magnetospheric origin. The similarity in the flux spectra of 4U 0142+61 and 1E 1048.1-5937 challenges the dust disk model proposed for the latter.Comment: 5 pages, 1 figure, accepted by Ap