55 research outputs found
Accommodating Students with Dietary Restrictions and Food Allergies
When working with students with dietary restrictions and/or food allergies who are requesting specific accommodations, collaboration between disability services and on-campus dining services is essential. April Beckwith, Student Accessibility Services coordinator at Clemson University, and Martha Green, registered dietitian with Aramark, will share their efforts to create a streamlined, multi-tiered process for accommodating students with dietary restrictions and/or food allergies. Participants will leave with a better understanding of how to collaborate with campus stakeholders, as well as suggestions for creating a systematic process for accommodating these students holistically
Tantalum sound velocity under shock compression
We used several variations of the shock compression method to measure the longitudinal sound velocity of shocked tantalum over the pressure range 37â363âGPa with a typical uncertainty of 1.0%%. These data are consistent with Ta remaining in the bcc phase along the principal Hugoniot from ambient pressure to â300âGPa, at which pressure melting occurs. These data also do not support the putative melting phenomena reported below 100âGPa in some static compression experiments
Tantalum sound velocity under shock compression
We used several variations of the shock compression method to measure the longitudinal sound velocity of shocked tantalum over the pressure range 37â363âGPa with a typical uncertainty of 1.0%%. These data are consistent with Ta remaining in the bcc phase along the principal Hugoniot from ambient pressure to â300âGPa, at which pressure melting occurs. These data also do not support the putative melting phenomena reported below 100âGPa in some static compression experiments
The c2d Spitzer Spectroscopic Survey of Ices Around Low-Mass Young Stellar Objects. IV. NH3 and CH3OH
NH3 and CH3OH are key molecules in astrochemical networks leading to the
formation of more complex N- and O-bearing molecules, such as CH3CN and
HCOOCH3. Despite a number of recent studies, little is known about their
abundances in the solid state. (...) In this work, we investigate the ~ 8-10
micron region in the Spitzer IRS (InfraRed Spectrograph) spectra of 41 low-mass
young stellar objects (YSOs). These data are part of a survey of interstellar
ices in a sample of low-mass YSOs studied in earlier papers in this series. We
used both an empirical and a local continuum method to correct for the
contribution from the 10 micron silicate absorption in the recorded spectra. In
addition, we conducted a systematic laboratory study of NH3- and
CH3OH-containing ices to help interpret the astronomical spectra. We clearly
detect a feature at ~9 micron in 24 low-mass YSOs. Within the uncertainty in
continuum determination, we identify this feature with the NH3 nu_2 umbrella
mode, and derive abundances with respect to water between ~2 and 15%.
Simultaneously, we also revisited the case of CH3OH ice by studying the nu_4
C-O stretch mode of this molecule at ~9.7 micron in 16 objects, yielding
abundances consistent with those derived by Boogert et al. 2008 (hereafter
paper I) based on a simultaneous 9.75 and 3.53 micron data analysis. Our study
indicates that NH3 is present primarily in H2O-rich ices, but that in some
cases, such ices are insufficient to explain the observed narrow FWHM. The
laboratory data point to CH3OH being in an almost pure methanol ice, or mixed
mainly with CO or CO2, consistent with its formation through hydrogenation on
grains. Finally, we use our derived NH3 abundances in combination with
previously published abundances of other solid N-bearing species to find that
up to 10-20 % of nitrogen is locked up in known ices.Comment: 31 pages, 15 figures, accepted for publication in Ap
Imaging Shock Waves in Diamond with Both High Temporal and Spatial Resolution at an XFEL
The advent of hard x-ray free-electron lasers (XFELs) has opened up a variety of scientific opportunities in areas as diverse as atomic physics, plasma physics, nonlinear optics in the x-ray range and protein crystallography. In this article, we access a new field of science by measuring quantitatively the local bulk properties and dynamics of matter under extreme conditions, in this case by using the short XFEL pulse to image an elastic compression wave in diamond. The elastic wave was initiated by an intense optical laser pulse and was imaged at different delay times after the optical pump pulse using magnified x-ray phase-contrast imaging. The temporal evolution of the shock wave can be monitored, yielding detailed information on shock dynamics, such as the shock velocity, the shock front width and the local compression of the material. The method provides a quantitative perspective on the state of matter in extreme conditions
Neuropsychologic function in toddlers exposed to cocaine in utero: A preliminary study
Feasibility of studying brain morphology in major depressive disorder with structural magnetic resonance imaging and clinical data from the electronic medical record: A pilot study
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