1,786 research outputs found
Who Are the Fatal Accident Drivers in Iowa?
A study of accident drivers in Iowa for five years reveals that fatal-accident drivers are mostly men. The 20-24 year and the 60-64 year groups show an excess of accident drivers. Five per cent of drivers did not carry a license. Out-of-state drivers have twice as many accidents as expected
Relative Changes in Percentages of Iowa Driver Licensees and Traffic Involvement By Age Groups Between 1953 and 1958
Dynamical Measurements of Black Hole Masses in Four Brightest Cluster Galaxies at 100 Mpc
We present stellar kinematics and orbit superposition models for the central
regions of four Brightest Cluster Galaxies (BCGs), based upon integral-field
spectroscopy at Gemini, Keck, and McDonald Observatories. Our integral-field
data span radii from < 100 pc to tens of kpc. We report black hole masses,
M_BH, of 2.1 +/- 1.6 x 10^10 M_Sun for NGC 4889, 9.7 + 3.0 - 2.6 x 10^9 M_Sun
for NGC 3842, and 1.3 + 0.5 - 0.4 x 10^9 M_Sun for NGC 7768. For NGC 2832 we
report an upper limit of M_BH < 9 x 10^9 M_Sun. Stellar orbits near the center
of each galaxy are tangentially biased, on comparable spatial scales to the
galaxies' photometric cores. We find possible photometric and kinematic
evidence for an eccentric torus of stars in NGC 4889, with a radius of nearly 1
kpc. We compare our measurements of M_BH to the predicted black hole masses
from various fits to the relations between M_BH and stellar velocity
dispersion, luminosity, or stellar mass. The black holes in NGC 4889 and NGC
3842 are significantly more massive than all dispersion-based predictions and
most luminosity-based predictions. The black hole in NGC 7768 is consistent
with a broader range of predictions.Comment: 24 pages, 18 figures. Accepted for publication in Ap
Developing Student Leadership Opportunities through Mentoring
Graduate assistants fulfill many roles and functions within the university setting. The partnership formed with supervisors is critical for mutual development and implementation of programs, building professionalism and student confidence. Supervisors provide many opportunities through coaching, sponsoring and connector roles. Intentional collaboration maximizes best practices supporting graduate student leadership development
Engaging community planners and local elected officials with local food systems producers to integrate local food systems into community plans and policies
Researchers examined three key obstacles to making progress in local food systems from a planning and land use perspective that could be handled by applying community planning tactics
1146-107 Severe frequent ventricular ectopy after exercise as a predictor of death in patients with advanced systolic heart failure
An early sex difference in the relation between mental rotation and object preference
Accumulating evidence suggests that males outperform females on mental rotation tasks as early as infancy. Sex differences in object preference have also been shown to emerge early in development and precede sex-typed play in childhood. Although research with adults and older children is suggestive of a relationship between play preferences and visuospatial abilities, including mental rotation, little is known about the developmental origins of this relationship. The present study compared mental rotation ability and object preference in 6- to 13-month-old infants. We used a novel paradigm to examine individual differences in infants’ mental rotation abilities as well as their differential preference for one of two sex-typed objects. A sex difference was found on both tasks, with boys showing an advantage in performance on the mental rotation task and exhibiting greater visual attention to the male-typed object (i.e., a toy truck) than to the female-typed object (i.e., a doll) in comparison to girls. Moreover, we found a relation between mental rotation and object preference that varied by sex. Greater visual interest in the male-typed object was related to greater mental rotation performance in boys, but not in girls. Possible explanations related to perceptual biases, prenatal androgen exposure, and experiential influences for this sex difference are discussed
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