2,800 research outputs found
SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science goals, survey design and instrumentation
The Molonglo Observatory Synthesis Telescope, operating at 843 MHz with a 5
square degree field of view, is carrying out a radio imaging survey of the sky
south of declination -30 deg. This survey (the Sydney University Molonglo Sky
Survey, or SUMSS) produces images with a resolution of 43" x 43" cosec(Dec.)
and an rms noise level of about 1 mJy/beam. SUMSS is therefore similar in
sensitivity and resolution to the northern NRAO VLA Sky Survey (NVSS; Condon et
al. 1998). The survey is progressing at a rate of about 1000 square degrees per
year, yielding individual and statistical data for many thousands of weak radio
sources. This paper describes the main characteristics of the survey, and
presents sample images from the first year of observation.Comment: 27 pages, 12 figures (figures 2, 8, 10 in jpg format); AJ, in pres
Information Processing is not Affected by Multiple Concussions in College Age Students
Click the PDF icon to download the abstract
Mental Health is not Affected by Multiple Concussions in Young Adults
Click the PDF icon to download the abstract
RFD-SF and Time to Peak Force for Grip Strength is not affected in College Aged Students with Multiple Concussions
Click the PDF icon to download the abstract
Black-holes, topological strings and large N phase transitions
The counting of microstates of BPS black-holes on local Calabi-Yau of the
form is explored
by computing the partition function of q-deformed Yang-Mills theory on .
We obtain, at finite , the instanton expansion of the gauge theory. It can
be written exactly as the partition function for U(N) Chern-Simons gauge theory
on a Lens space, summed over all non-trivial vacua, plus a tower of
non-perturbative instanton contributions. In the large limit we find a
peculiar phase structure in the model. At weak string coupling the theory
reduces to the trivial sector and the topological string partition function on
the resolved conifold is reproduced in this regime. At a certain critical
point, instantons are enhanced and the theory undergoes a phase transition into
a strong coupling regime. The transition from the strong coupling phase to the
weak coupling phase is of third order.Comment: 16 pages, 3 figures; Invited talk given at QG05, Cala Gonone (Italy),
September 200
Entrainment: A domain general cognitive timing mechanism?
From an early age onwards we tend to synchronize to temporally regular and rhythmic stimuli, such as the beat in music, which inevitably leads to movement. Recently, such basic mapping of temporally regular sound and motor behavior has been critically discussed and the four speakers of this symposium will address extensions of a basic sensorimotor conceptualization of entrainment in their talks. M. Henry and colleagues discuss oscillatory entrainment in perception only, while E. Large puts to test whether oscillatory entrainment simply mirrors stimulus frequency when movement is coupled with syncopated rhythm. J. Grahn explores whether non-beat related factors impact synchronization in movement, while S. Dalla-Bella confers how stimulus complexity affects people's capacity to synchronize finger tapping but also perception. The symposium will be discussed by V. Penhune
Identification of floodwater source areas in Nepal using SCIMAP‐Flood
Practical approaches for managing flooding from fluvial sources are moving away from mitigation solely at the point of impact and towards integrated catchment management. This considers the source areas, flow pathways of floodwaters and the locations and exposure to the risk of communities. For a field site in southern Nepal, we analyse catchment response to a range of simulated rainfall events, which when evaluated collectively can help guide potential flood management solutions. This is achieved through the adoption of SCIMAP-Flood, a decision support framework that works at the catchment-scale to identify critical source areas for floodwaters. The SCIMAP-Flood Fitted inverse modelling approach has been applied to the East Rapti catchment, Nepal. For multiple flood impact locations throughout the catchment, SCIMAP-Flood effectively identifies locations where flood management measures would have the most positive effects on risk reduction. The results show that the spatial targeting of mitigation measures in areas of irrigated and rainfed agriculture and the prevention of deforestation or removal of shrubland would be the most effective approaches. If these actions were in the upper catchment above Hetauda or upstream of Manahari they would have the most effective reduction in the flood peak
- …