1,770 research outputs found
Performance experience with the new jpl wind tunnel data acquisition system
Performance characteristics of data acquisition system for wind tunnel digital data functio
Retrospective Policy Analysis of Kentucky House Bill 1
Background: In 2011, the Centers for Disease Control (CDC) coined the phrase, âopioid epidemicâ in response to the staggering increase in opioid use and opioid- related deaths. Kentucky House Bill 1 (HB1) passed in 2012, attempted to stifle the impact of the opioid epidemic on the citizens of the Commonwealth by imposing supply-side restrictions on the prescription and dispensing of opioid pills. Objective: The primary objective of this analysis is to evaluate the effectiveness of HB1 on the reduction of opioid-related deaths, opioid prescription rates, and intravenous opioid drug use rates. Methods: This analysis employed Eugene Bardachâs framework for policy analysis- the Eightfold Path, to systematically assess the policy and other options at that time. Results: After HB1 a decrease in the rate of opioid prescriptions in Kentucky was observed. However, the rate of opioid-related overdose deaths increased. Discussion/Recommendation: Supply-side restrictions on opioid pills may lead to the unintended consequence of diversion to intravenous opioid abuse, which carries even greater public health implications. Comprehensive policy should include both supply-side regulations as well as provisions for treatment and recovery for those suffering from addiction
An eye-tracking study examining the role of question-answer congruency in childrenâs comprehension of only: A preliminary report
âCrainâs puzzleâ is a term that has been used to describe childrenâs difficulty comprehending the focus
operator only when it is in subject position (subject-only), showing a tendency to interpret only as if
it preceded the verb phrase instead. While some researchers attribute childrenâs difficulty to impoverished
pragmatics in the discourse (Hackl et al., 2015), others argue that childrenâs grammar fundamentally
differs from adultsâ Notley et al. (2009), yielding a debate regarding whether childrenâs misinterpretation
reflects a non-adult-like linguistic representation of only or some computational burden on their processing
of meaning. This study addresses this debate by using eye-tracking to examine whether pragmatic
felicity guides childrenâs eye-movements to incorporate the necessary information during processing on
par with adults. Following Hackl et al. (2015), we experimentally manipulated whether the prompt question
preceding the target sentence is pragmatically congruent or incongruent in felicitously introducing
the only-statement in terms of which element in the sentence is focused by only. Emerging findings reveal
that pragmatic richness in the discourse affected processing in both adults and children in a condition that
was logically false. Results thus far provide support for an account which posits an important role for
pragmatics
JPL preferred parts list: Reliable electronic components
The JPL Preferred Parts List was prepared to provide a basis for selection of electronic parts for JPL spacecraft programs. Supporting tests for the listed parts were designed to comply with specific spacecraft environmental requirements. The list tabulates the electronic, magnetic, and electromechanical parts applicable to all JPL electronic equipment wherein reliability is a major concern. The parts listed are revelant to equipment supplied by subcontractors as well as fabricated at the laboratory
The Factory and The Beehive II. Activity and Rotation in Praesepe and the Hyades
Open clusters are collections of stars with a single, well-determined age,
and can be used to investigate the connections between angular-momentum
evolution and magnetic activity over a star's lifetime. We present the results
of a comparative study of the relationship between stellar rotation and
activity in two benchmark open clusters: Praesepe and the Hyades. As they have
the same age and roughly solar metallicity, these clusters serve as an ideal
laboratory for testing the agreement between theoretical and empirical
rotation-activity relations at 600 Myr. We have compiled a sample of
720 spectra --- more than half of which are new observations --- for 516
high-confidence members of Praesepe; we have also obtained 139 new spectra for
130 high-confidence Hyads. We have collected rotation periods () for
135 Praesepe members and 87 Hyads. To compare emission, an indicator
of chromospheric activity, as a function of color, mass, and Rossby number
, we first calculate an expanded set of values, with which we can
obtain the to bolometric luminosity ratio, ,
even when spectra are not flux-calibrated and/or stars lack reliable distances.
Our values cover a broader range of stellar masses and colors (roughly
equivalent to spectral types from K0 to M9), and exhibit better agreement
between independent calculations, than existing values. We find no difference
between the two clusters in their equivalent width or
distributions, and therefore take the merged
and data to be representative of 600-Myr-old stars. Our analysis
shows that activity in these stars is saturated for
. Above that value activity declines as a
power-law with slope , before dropping off rapidly
at ...Comment: 17 pages, 15 figures, Accepted by Ap
The Factory and The Beehive I. Rotation Periods For Low-Mass Stars in Praesepe
Stellar rotation periods measured from single-age populations are critical
for investigating how stellar angular momentum content evolves over time, how
that evolution depends on mass, and how rotation influences the stellar dynamo
and the magnetically heated chromosphere and corona. We report rotation periods
for 40 late-K to mid-M stars members of the nearby, rich, intermediate-age
(~600 Myr) open cluster Praesepe. These rotation periods were derived from ~200
observations taken by the Palomar Transient Factory of four cluster fields from
2010 February to May. Our measurements indicate that Praesepe's mass-period
relation transitions from a well-defined singular relation to a more scattered
distribution of both fast and slow rotators at ~0.6 Msun. The location of this
transition is broadly consistent with expectations based on observations of
younger clusters and the assumption that stellar-spin down is the dominant
mechanism influencing angular momentum evolution at 600 Myr. However, a
comparison to data recently published for the Hyades, assumed to be coeval to
Praesepe, indicates that the divergence from a singular mass-period relation
occurs at different characteristic masses, strengthening the finding that
Praesepe is the younger of the two clusters. We also use previously published
relations describing the evolution of rotation periods as a function of color
and mass to evolve the sample of Praesepe periods in time. Comparing the
resulting predictions to periods measured in M35 and NGC 2516 (~150 Myr) and
for kinematically selected young and old field star populations suggests that
stellar spin-down may progress more slowly than described by these relations.Comment: To appear in the ApJ. 18 pages, 12 figures; version with higher
resolution figures available at
http://www.astro.columbia.edu/~marcel/papers/praesepe.pdf. Paper title
inspired by local news; see http://tinyurl.com/redhone
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