14,836 research outputs found
Experiments on Visual Acuity and the Visibility of Markings on the Ground in Long-duration Earth-Orbital Space Flight
Visual acuity and visibility of markings on ground in long duration earth orbital space fligh
Unsafe at Any Campus: Don\u27t Let Colleges Become the Next Cruise Ships, Nursing Homes, and Food Processing Plants
The decision to educate our students via in-person or online learning environments while COVID-19 is unrestrained is a false choice, when the clear path to achieve our chief objective safely, the education of our students, can be done online. Our decision-making should be guided by the overriding principle that people matter more than money. We recognize that lost tuition revenue if students delay or defer education is an institutional concern, but we posit that many students and parents would prefer a safer online alternative to riskier in-person options, especially as we get closer to fall, and American death tolls rise. This Article argues the extra stress of trying to maintain safety from infection with a return to campus will make teaching and learning less effective. While high density classrooms promote virus transmission and potentially super-spreader events, we can take the lessons we learned during the spring and provide courses without the stressors of spreading the virus. We argue the socially responsible decision is to deliver compassionate, healthy, and first-rate online pedagogy, and we offer a vision of how to move forward into this brave new world
Unsafe at Any Campus: Don\u27t Let Colleges Become the Next Cruise Ships, Nursing Homes, and Food Processing Plants
The decision to educate our students via in-person or online learning environments while COVID-19 is unrestrained is a false choice, when the clear path to achieve our chief objective safely, the education of our students, can be done online. Our decision-making should be guided by the overriding principle that people matter more than money. We recognize that lost tuition revenue if students delay or defer education is an institutional concern, but we posit that many students and parents would prefer a safer online alternative to riskier in-person options, especially as we get closer to fall, and American death tolls rise. This Article argues the extra stress of trying to maintain safety from infection with a return to campus will make teaching and learning less effective. While high density classrooms promote virus transmission and potentially super-spreader events, we can take the lessons we learned during the spring and provide courses without the stressors of spreading the virus. We argue the socially responsible decision is to deliver compassionate, healthy, and first-rate online pedagogy, and we offer a vision of how to move forward into this brave new world
A universal velocity distribution of relaxed collisionless structures
Several general trends have been identified for equilibrated,
self-gravitating collisionless systems, such as density or anisotropy profiles.
These are integrated quantities which naturally depend on the underlying
velocity distribution function (VDF) of the system. We study this VDF through a
set of numerical simulations, which allow us to extract both the radial and the
tangential VDF. We find that the shape of the VDF is universal, in the sense
that it depends only on two things namely the dispersion (radial or tangential)
and the local slope of the density. Both the radial and the tangential VDF's
are universal for a collection of simulations, including controlled collisions
with very different initial conditions, radial infall simulation, and
structures formed in cosmological simulations.Comment: 13 pages, 6 figures; oversimplified analysis corrected; changed
abstract and conclusions; significantly extended discussio
Unsafe at any Campus: Don\u27t Let Colleges Become the Next Cruise Ships, Nursing Homes, and Food Processing Plants
The decision to educate our students via in-person or online learning environments while COVID-19 is unrestrained is a false choice, when the clear path to achieve our chief objective safely, the education of our students, can be done online. Our decision-making should be guided by the overriding principle that people matter more than money. We recognize that lost tuition revenue if students delay or defer education is an institutional concern, but we posit that many students and parents would prefer a safer online alternative to riskier in-person options, especially as we get closer to fall, and American death tolls rise. This Article argues the extra stress of trying to maintain safety from infection with a return to campus will make teaching and learning less effective. While high density classrooms promote virus transmission and potentially super-spreader events, we can take the lessons we learned during the spring and provide courses without the stressors of spreading the virus. We argue the socially responsible decision is to deliver compassionate, healthy, and first-rate online pedagogy, and we offer a vision of how to move forward into this brave new world
"How May I Help You?": Modeling Twitter Customer Service Conversations Using Fine-Grained Dialogue Acts
Given the increasing popularity of customer service dialogue on Twitter,
analysis of conversation data is essential to understand trends in customer and
agent behavior for the purpose of automating customer service interactions. In
this work, we develop a novel taxonomy of fine-grained "dialogue acts"
frequently observed in customer service, showcasing acts that are more suited
to the domain than the more generic existing taxonomies. Using a sequential
SVM-HMM model, we model conversation flow, predicting the dialogue act of a
given turn in real-time. We characterize differences between customer and agent
behavior in Twitter customer service conversations, and investigate the effect
of testing our system on different customer service industries. Finally, we use
a data-driven approach to predict important conversation outcomes: customer
satisfaction, customer frustration, and overall problem resolution. We show
that the type and location of certain dialogue acts in a conversation have a
significant effect on the probability of desirable and undesirable outcomes,
and present actionable rules based on our findings. The patterns and rules we
derive can be used as guidelines for outcome-driven automated customer service
platforms.Comment: 13 pages, 6 figures, IUI 201
Nova Sagittarii 1994 #1 (V4332 Sagittarii): The Discovery and Evolution of an Unusual Luminous Red Variable Star
We report photometry and spectroscopy of the evolution of Nova Sagittarii
1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and
spectral evolution of this outburst to known classes of outbursts -- including
classical novae and outbursts occurring on symbiotic stars -- and find this
object does NOT conform to any known class of outburst. The closest match to
the behavior of this unusual object is M31 RV, an extremely luminous and red
variable object discovered in the bulge of M31 in 1988. However, the temporal
behavior and maximum luminosity of the two events differ by several orders of
magnitude, requiring substantial intrinsic variation if these two events are
members the same type of outburst.
Our model of the spectroscopic evolution of this outburst shows that the
effective temperature cooled from 4400 K to 2300 K over the three month span of
our observations. In combination with line diagnostics in our later spectra,
including [OI] lambda 5577 and the dramatic increase in the Halpha to Hbeta
ratio, we infer the existence of a cool, dense (N_e ~ 10^{8-9} cm^{-3})
envelope that is optically thick in the Hydrogen Balmer recombination lines
(case C). We suggest that a nuclear event in a single star, in which a slow
shock drove the photosphere outwards, can power the observed luminosity
evolution and the emission spectrum.Comment: Accepted for publication in AJ. 24 pages including 8 embedded
postscript figures. Also available at
http://www.astronomy.ohio-state.edu/~martini/pub
Subcritical Flow at Open Channel Structures Open Channel Expansions
Analyzing the hydraulics of open channel constrictions has been modified to allow the analysis of energy loss in open channel expansions. The modified technique has been compared with previous methods of analysis using data collected in the laboratory on open channel expansions with vertical walls, and triangular-shaped baffles. Also, a design procedure for such baffled outlet structures has been developed
The Relationship Between Tolerance For Ambiguity And Students Propensity To Cheat On A College Exam
Businesses in the United States are being ravaged internally for a total of up to $400 billion yearly by white-collar crime (Martin, 1998).   Fraud, the culprit, is defined as, “deceit; trickery; cheating” (Webster’s New World dictionary, 1978).  This phenomenon knows no bounds, has no feelings, respects no one; and its perpetrators are described as the “greatest threat to businesses of all sizes” by Mark Simmons, a New York-based auditor with 20 years’ experience of fighting fraud (Applegate, 1998).  This exploratory study is aimed at gaining a greater understanding of the psychological consistency of these perpetrators, who remain a constant threat to business education
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