1,947 research outputs found
New genera and species of batoid fishes
The trawling campaigns carried out by the research vessel ATLANTIS of the Woods Hole Oceanographic Institution along the north and south coasts of Cuba during the winter of 1938 and spring of 1939, under the joint auspices of the University of Havana and of Harvard University, brought to light along the 200-500 fathom zone an abundant population of small skates (Family Rajidae), the existence of which had not previously been suspected there...
Bostonia. Volume 14
Founded in 1900, Bostonia magazine is Boston University's main alumni publication, which covers alumni and student life, as well as university activities, events, and programs
Understanding the Effects of Physical Activity on Executive Functioning and Psycho-Emotional Well-Being in Children with ADHD
A short bout of physical activity has been shown to improve executive functioning in children. However, the implications for children with Attention Deficit Hyperactivity Disorder (ADHD) has been understudied. We examined the impact of a 10min bout of physical activity on executive functioning and psycho-emotional well-being in children with ADHD. Participants engaged in two lab-based sessions separated by 1-week: a physical activity session and a control session. The physical activity session included a 10min bout of moderate-intensity biking, with a pre-post battery of cognitive and psycho-emotional assessments. The control session consisted of 10mins of silent reading. We used functional imaging during the cognitive assessments to measure changes in prefrontal cortical activation. We found that 10mins of physical activity promoted greater inhibitory control, positive mood, and general self-efficacy compared to control. These findings suggest that a short bout of physical activity has the potential to improve specific aspects of ADHD symptomology
Microlensing of the Lensed Quasar SDSS0924+0219
We analyze V, I and H band HST images and two seasons of R-band monitoring
data for the gravitationally lensed quasar SDSS0924+0219. We clearly see that
image D is a point-source image of the quasar at the center of its host galaxy.
We can easily track the host galaxy of the quasar close to image D because
microlensing has provided a natural coronograph that suppresses the flux of the
quasar image by roughly an order of magnitude. We observe low amplitude,
uncorrelated variability between the four quasar images due to microlensing,
but no correlated variations that could be used to measure a time delay. Monte
Carlo models of the microlensing variability provide estimates of the mean
stellar mass in the lens galaxy (0.02 Msun < M < 1.0 Msun), the accretion disk
size (the disk temperature is 5 x 10^4 K at 3.0 x 10^14 cm < rs < 1.4 x 10^15
cm), and the black hole mass (2.0 x 10^7 Msun < MBH \eta_{0.1}^{-1/2}
(L/LE)^{1/2} < 3.3 x 10^8 Msun), all at 68% confidence. The black hole mass
estimate based on microlensing is consistent with an estimate of MBH = 7.3 +-
2.4 x 10^7 Msun from the MgII emission line width. If we extrapolate the
best-fitting light curve models into the future, we expect the the flux of
images A and B to remain relatively stable and images C and D to brighten. In
particular, we estimate that image D has a roughly 12% probability of
brightening by a factor of two during the next year and a 45% probability of
brightening by an order of magnitude over the next decade.Comment: v.2 incorporates referee's comments and corrects two errors in the
original manuscript. 28 pages, 10 figures, published in Ap
Electron Microprobe Analysis Of Silica In Epidermal Cells Of Equisetum
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141232/1/ajb209978.pd
Summertime cooling of the shallow continental shelf
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): C07015, doi:10.1029/2010JC006744.In summer on the shallow New England continental shelf, near the coast the water temperature is much cooler than the observed surface heat flux suggests. Using depth-integrated heat budgets in 12 and 27 m water depth calculated from observed surface heat flux, water temperature, and velocity, we demonstrate that on time scales of weeks to months the water is persistently cooled due to a mean upwelling circulation. Because the mean wind is weak, that mean circulation is likely not wind driven; it is partly a tidal residual circulation. A feedback exists between the cross-shelf and surface heat fluxes: the two fluxes remain nearly in balance for months, so the water temperature is nearly constant in spite of strong surface heating (the heat budget is two-dimensional). A conceptual model explains the feedback mechanism: the short flushing time of the shallow shelf produces a near steady state heat balance, regardless of the exact form of the circulation, and the feedback is via the influence of surface heating on temperature stratification. Along-shelf heat flux divergence is apparently small compared to the surface and cross-shelf heat flux divergences on time scales of weeks to months. Heat transport due to Stokes drift from surface gravity waves is substantial, warms the shallow shelf in summer, and was previously ignored. In winter, the surface heat flux dominates and the observed water temperature is close to the temperature predicted from surface cooling (the heat budget is one-dimensional); weak winter stratification makes the cross-shelf heat flux small even during strong cross-shelf circulation.This research was
funded by National Aeronautics and Space Administration Headquarters
grant NNG04GL03G and Earth System Science Fellowship Grant
NNG04GQ14H; Woods Hole Oceanographic Institution through Academic
Programs Fellowship Funds and MVCO; National Science Foundation
grants OCE‐0241292, OCE‐0548961, and OCE‐0337892; the Jewett/
EDUC/Harrison Foundation; and Office of Naval Research contracts
N00014‐01‐1‐0029 and N00014‐05‐10090 for the Low‐Wind Component
of the Coupled Boundary Layers Air‐Sea Transfer Experiment
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