162 research outputs found
An eLearning Narration Modality Study: In Pursuit of Faster, Cheaper, and Almost the Same
The purpose of this study is to examine the effects of five different eLearning modality practices on workplace learning and perceived learner satisfaction. Using a factorial posttest comparison design (with a control group), this experimental field study explored the learning effects and learner perceived satisfaction associated with the use of different modality approaches within an eLearning course delivered in a workplace. More than 3,000 study participants, who are part of a U.S. federal workforce, where randomly assigned to one of five narration groups. A Learning Management System (LMS) gathered demographic data, administered the course, recorded individual test scores, learner satisfaction scores, and recorded times associated with course completion.
Findings from this study suggest that in a U.S. workplace environment, eLearning using text-only (i.e., no voice narration) has similar learning outcomes to eLearning with narration. The important potential benefit of this finding is the reduction to costs associated with eLearning development and implementationāthat is, faster and cheaper eLearning development while achieving almost the same learning outcomes. Coupled with the learner satisfaction finding in this study, that workplace learners preferred text-only over any of the forms of narration in this study, then a strong case begins to form for using text-only with straightforward content, for eLearning to be implemented in a U.S. workplace setting
The Full-sky Astrometric Mapping Explorer -- Astrometry for the New Millennium
FAME is designed to perform an all-sky, astrometric survey with unprecedented
accuracy. It will create a rigid astrometric catalog of 4x10^7 stars with 5 <
m_V < 15. For bright stars, 5 < m_V < 9, FAME will determine positions and
parallaxes accurate to < 50 microarcseconds, with proper motion errors < 50
microarcseconds/year. For fainter stars, 9 < m_V < 15, FAME will determine
positions and parallaxes accurate to < 500 microarcseconds, with proper motion
errors < 500 microarcseconds/year. It will also collect photometric data on
these 4 x 10^7 stars in four Sloan DSS colors.Comment: 6 pages, 4 figures, to appear in "Working on the Fringe
The Single-Case Reporting Guideline In BEhavioural Interventions (SCRIBE) 2016 statement
We developed a reporting guideline to provide authors with guidance about what should be reported when writing a paper for publication in a scientific journal using a particular type of research design: the single-case experimental design. This report describes the methods used to develop the Single-Case Reporting guideline In BEhavioural interventions (SCRIBE) 2016. As a result of 2 online surveys and a 2-day meeting of experts, the SCRIBE 2016 checklist was developed, which is a set of 26 items that authors need to address when writing about single-case research. This article complements the more detailed SCRIBE 2016 Explanation and Elaboration article (Tate et al., 2016) that provides a rationale for each of the items and examples of adequate reporting from the literature. Both these resources will assist authors to prepare reports of single-case research with clarity, completeness, accuracy, and transparency. They will also provide journal reviewers and editors with a practical
checklist against which such reports may be critically evaluated. We recommend that the SCRIBE 2016 is used by authors preparing manuscripts describing single-case research for publication, as well as journal reviewers and editors who are evaluating such manuscripts.Funding for the SCRIBE project was provided by the Lifetime Care and Support Authority of New South Wales, Australia. The funding body was not involved in the conduct, interpretation or writing of this work. We acknowledge the contribution of the responders to the Delphi surveys, as well as administrative assistance provided by Kali Godbee and Donna Wakim at the SCRIBE consensus meeting. Lyndsey Nickels was funded by an Australian Research Council Future Fellowship (FT120100102) and Australian Research Council Centre of Excellence in Cognition and Its Disorders (CE110001021). For further discussion on this topic, please visit the Archives of Scientific Psychology online public forum at http://arcblog.apa.org. (Lifetime Care and Support Authority of New South Wales, Australia; FT120100102 - Australian Research Council Future Fellowship; CE110001021 - Australian Research Council Centre of Excellence in Cognition and Its Disorders)Published versio
Data Assimilation Enhancements to Air Force Weathers Land Information System
The United States Air Force (USAF) has a proud and storied tradition of enabling significant advancements in the area of characterizing and modeling land state information. 557th Weather Wing (557 WW; DoDs Executive Agent for Land Information) provides routine geospatial intelligence information to warfighters, planners, and decision makers at all echelons and services of the U.S. military, government and intelligence community. 557 WW and its predecessors have been home to the DoDs only operational regional and global land data analysis systems since January 1958. As a trusted partner since 2005, Air Force Weather (AFW) has relied on the Hydrological Sciences Laboratory at NASA/GSFC to lead the interagency scientific collaboration known as the Land Information System (LIS). LIS is an advanced software framework for high performance land surface modeling and data assimilation of geospatial intelligence (GEOINT) information
Two mini-Neptunes Transiting the Adolescent K-star HIP 113103 Confirmed with TESS and CHEOPS
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits
( d for HIP 113103 b and d for HIP 113103 c) around
the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first
identified from the TESS mission, and was confirmed via additional photometric
and spectroscopic observations, including a 17.5 hour observation for the
transits of both planets using ESA CHEOPS. We place min and
min limits on the absence of transit timing variations over the three year
photometric baseline, allowing further constraints on the orbital
eccentricities of the system beyond that available from the photometric transit
duration alone. With a planetary radius of
, HIP 113103 b resides within the
radius gap, and this might provide invaluable information on the formation
disparities between super-Earths and mini-Neptunes. Given the larger radius
for HIP 113103 c, and close proximity
of both planets to HIP 113103, it is likely that HIP 113103 b might have lost
(or is still losing) its primordial atmosphere. We therefore present simulated
atmospheric transmission spectra of both planets using JWST, HST, and Twinkle.
It demonstrates a potential metallicity difference (due to differences in their
evolution) would be a challenge to detect if the atmospheres are in chemical
equilibrium. As one of the brightest multi sub-Neptune planet systems suitable
for atmosphere follow up, HIP 113103 b and HIP 113103 c could provide insight
on planetary evolution for the sub-Neptune K-star population.Comment: 18 pages, 12 figures, accepted for publication in the Monthly Notices
of the Royal Astronomical Societ
Exploring the Diversity of Groups at 0.1<z<0.8 with X-ray and Optically Selected Samples
We present the global group properties of two samples of galaxy groups
containing 39 high quality X-ray selected systems and 38 optically
(spectroscopically) selected systems in coincident spatial regions at
0.12<z<0.79. Only nine optical systems are associable with X-ray systems. We
discuss the confusion inherent in the matching of both galaxies to extended
X-ray emission and of X-ray emission to already identified optical systems.
Extensive spectroscopy has been obtained and the resultant redshift catalog and
group membership are provided here. X-ray, dynamical, and total stellar masses
of the groups are also derived and presented. We explore the effects of
applying three different kinds of radial cut to our systems: a constant cut of
1 Mpc and two r200 cuts, one based on the velocity dispersion of the system and
the other on the X-ray emission. We find that an X-ray based r200 results in
less scatter in scaling relations and less dynamical complexity as evidenced by
results of the Anderson-Darling and Dressler-Schectman tests, indicating that
this radius tends to isolate the virialized part of the system. The constant
and velocity dispersion based cuts can overestimate membership and can work to
inflate velocity dispersion and dynamical and stellar mass. We find Lx-sigma
and Mstellar-Lx scaling relations for X-ray and optically selected systems are
not dissimilar. The mean fraction of mass found in stars for our systems is
approximately 0.014 with a logarithmic standard deviation of 0.398 dex. We also
define and investigate a sample of groups which are X-ray underluminous given
the total group stellar mass. For these systems the fraction of stellar mass
contributed by the most massive galaxy is typically lower than that found for
the total population of groups implying that there may be less IGM contributed
from the most massive member in these systems. (Abridged)Comment: Accepted for publication in the Astrophysical Journal (ApJ). 27
pages, 14 figures, 12 table
Initial Visible and Mid-IR Characterization of P/2019 LDā (ATLAS), an Active Transitioning Centaur Among the Trojans, with Hubble, Spitzer, ZTF, Keck, APO and GROWTH Imaging and Spectroscopy
We present visible and mid-infrared imagery and photometry of Jovian co-orbital comet P/2019 LDā (ATLAS) taken with Hubble Space Telescope/WFC3 on 2020 April 1, Spitzer Space Telescope/IRAC on 2020 January 25, Zwicky Transient Facility between 2019 April 9 and 2019 Nov 8 and the GROWTH telescope network from 2020 May to July, as well as visible spectroscopy from Keck/LRIS on 2020 August 19. Our observations indicate that LDā has a nucleus with radius 0.2-1.8 km assuming a 0.08 albedo and that the coma is dominated by ā¼100 Ī¼ m-scale dust ejected at ā¼1 m/s speeds with a ā¼1" jet pointing in the SW direction. LDā experienced a total dust mass loss of ā¼10āø kg and dust mass loss rate of ā¼6 kg/s with AfĻ/cross-section varying between ā¼85 cm/125 kmĀ² and ā¼200 cm/310 kmĀ² between 2019 April 9 and 2019 Nov 8. If the AfĻ/cross-section increase remained constant, it implies that LDā has remained active since ā¼2018 November when it came within 4.8 au of the Sun, a typical distance for comets to begin sublimation of HāO. From our 4.5 Ī¼m Spitzer observations, we set a limit on CO/COā gas production of ā¼10Ā²ā·/ā¼10Ā²ā¶ mol/s. Multiple bandpass photometry of LDā taken by the GROWTH network measured in a 10,000 km aperture provide color measurements of g-r = 0.59Ā±0.03, r-i = 0.18Ā±0.05, and i-z = 0.01Ā±0.07, colors typical of comets. We set a spectroscopic upper limit to the production of HāO gas of ā¼80 kg/s. Improving the orbital solution for LDā with our observations, we determine that the long-term orbit of LDā is that of a typical Jupiter Family Comet having close encounters with Jupiter coming within ā¼0.5 Hill radius in the last ā¼3 y to within 0.8 Hill radius in ā¼9 y and has a 95% chance of being ejected from the Solar System in < 10 Myr
Updated Guidance Regarding The Risk ofAllergic Reactions to COVID-19 Vaccines and Recommended Evaluation and Management: A GRADE Assessment, and International Consensus Approach
This guidance updates 2021 GRADE (Grading of Recommendations Assessment, Development and Evaluation) recommendations regarding immediate allergic reactions following coronavirus disease 2019 (COVID-19) vaccines and addresses revaccinating individuals with first-dose allergic reactions and allergy testing to determine revaccination outcomes. Recent meta-analyses assessed the incidence of severe allergic reactions to initial COVID-19 vaccination, risk of mRNA-COVID-19 revaccination after an initial reaction, and diagnostic accuracy of COVID-19 vaccine and vaccine excipient testing in predicting reactions. GRADE methods informed rating the certainty of evidence and strength of recommendations. A modified Delphi panel consisting of experts in allergy, anaphylaxis, vaccinology, infectious diseases, emergency medicine, and primary care from Australia, Canada, Europe, Japan, South Africa, the United Kingdom, and the United States formed the recommendations. We recommend vaccination for persons without COVID-19 vaccine excipient allergy and revaccination after a prior immediate allergic reaction. We suggest against \u3e 15-minute postvaccination observation. We recommend against mRNA vaccine or excipient skin testing to predict outcomes. We suggest revaccination of persons with an immediate allergic reaction to the mRNA vaccine or excipients be performed by a person with vaccine allergy expertise in a properly equipped setting. We suggest against premedication, split-dosing, or special precautions because of a comorbid allergic history
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