1,874 research outputs found
Method for measuring the characteristics of a gas Patent
Device for simultaneously determining density, velocity, and temperature of streaming ga
Electrostatic plasma modulator for space vehicle re-entry communication Patent
Electrostatic modulator for communicating through plasma sheath formed around spacecraft during reentr
Internet sources for nursing and allied health
Lists and describes available Internet resources for nursing and allied health professionals. Procedure for subscribing and unsubscribing from the discussion lists; Newsgroups available for nurses; Accessing to gopher servers
OPserver: interactive online-computations of opacities and radiative accelerations
Codes to compute mean opacities and radiative accelerations for arbitrary
chemical mixtures using the Opacity Project recently revised data have been
restructured in a client--server architecture and transcribed as a subroutine
library. This implementation increases efficiency in stellar modelling where
element stratification due to diffusion processes is depth dependent, and thus
requires repeated fast opacity reestimates. Three user modes are provided to
fit different computing environments, namely a web browser, a local workstation
and a distributed grid.Comment: 5 pages, 1 figur
Photometric redshift of the GRB 981226 host galaxy
No optical afterglow was found for the dark burst GRB 981226 and hence no
absorption redshift has been obtained. We here use ground-based and space
imaging observations to analyse the spectral energy distribution (SED) of the
host galaxy. By comparison with synthetic template spectra we determine the
photometric redshift of the GRB 981226 host to be z_phot = 1.11+/-0.06 (68%
confidence level). While the age-metallicity degeneracy for the host SED
complicates the determination of accurate ages, metallicity, and extinction,
the photometric redshift is robust. The inferred z_phot value is also robust
compared to a Bayesian redshift estimator which gives z_phot=0.94+/-0.13. The
characteristics for this host are similar to other GRB hosts previously
examined. Available low resolution spectra show no emission lines at the
expected wavelengths. The photometric redshift estimate indicates an isotropic
energy release consistent with the Amati relation for this GRB which had a
spectrum characteristic of an X-ray flash.Comment: Accepted for publication in ApJ Letter
Comparing virtual patients with synthesized and natural speech
Virtual Patient (VP) simulations are often designed to use pre-recorded
speech in order to provide more realism and immersion. However, using actors for
recording these utterances has certain downsides. It can add to the cost during
implementation, can take considerable time especially when a large number of
VPs have to be created, and is not very flexible for example when sentences or
words have to be added frequently. This study aims to explore the use of
synthesized speech as an alternative to pre-recorded speech for VPs. Two medical
scenarios have been prepared for this study, and both have been implemented
using a VP with natural language or with synthesized speech. In a pilot study we
explored students' retention rates of the symptoms reported by the VP under both
conditions to investigate whether synthesized speech can serve as a good enough
alternative
Using Three-Body Recombination to Extract Electron Temperatures of Ultracold Plasmas
Three-body recombination, an important collisional process in plasmas,
increases dramatically at low electron temperatures, with an accepted scaling
of T_e^-9/2. We measure three-body recombination in an ultracold neutral xenon
plasma by detecting recombination-created Rydberg atoms using a
microwave-ionization technique. With the accepted theory (expected to be
applicable for weakly-coupled plasmas) and our measured rates we extract the
plasma temperatures, which are in reasonable agreement with previous
measurements early in the plasma lifetime. The resulting electron temperatures
indicate that the plasma continues to cool to temperatures below 1 K.Comment: 5 pages, 3 figure
What levels of cholesterol should be treated for primary prevention?
The levels of cholesterol that should be treated for primary prevention are based on low-density lipoprotein cholesterol (LDL-C) levels of > 100 mg/dL to > 190 mg/dL and vary according to whether the patient's risk is high, moderate, or low. See the table to estimate risk. Grade of recommendation for medication indications: A (on the basis of high-quality randomized controlled trials). Grade of recommendation for lifestyle indications: B (on the basis of extrapolations from randomized controlled trials)
Low-Altitude Reconnection Inflow-Outflow Observations during a 2010 November 3 Solar Eruption
For a solar flare occurring on 2010 November 3, we present observations using
several SDO/AIA extreme-ultraviolet (EUV) passbands of an erupting flux rope
followed by inflows sweeping into a current sheet region. The inflows are soon
followed by outflows appearing to originate from near the termination point of
the inflowing motion - an observation in line with standard magnetic
reconnection models. We measure average inflow plane-of-sky speeds to range
from ~150-690 km/s with the initial, high-temperature inflows being the
fastest. Using the inflow speeds and a range of Alfven speeds, we estimate the
Alfvenic Mach number which appears to decrease with time. We also provide
inflow and outflow times with respect to RHESSI count rates and find that the
fast, high-temperature inflows occur simultaneously with a peak in the RHESSI
thermal lightcurve. Five candidate inflow-outflow pairs are identified with no
more than a minute delay between detections. The inflow speeds of these pairs
are measured to be 10^2 km/s with outflow speeds ranging from 10^2-10^3 km/s -
indicating acceleration during the reconnection process. The fastest of these
outflows are in the form of apparently traveling density enhancements along the
legs of the loops rather than the loop apexes themselves. These flows could
either be accelerated plasma, shocks, or waves prompted by reconnection. The
measurements presented here show an order of magnitude difference between the
retraction speeds of the loops and the speed of the density enhancements within
the loops - presumably exiting the reconnection site.Comment: 31 pages, 13 figures, 1 table, Accepted to ApJ (expected publication
~July 2012
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