14,044 research outputs found
Applications of prestressed segmented brittle materials in aerospace structures
Prestressed segmented brittle materials in aerospace structure
Review of the financial and medicolegal implications of nasal fractures seen at St Luke’s Hospital
Simple nasal bone fractures are the third most common type of all fractures leading to numerous patient visits at the Accident & Emergency department. Nasal fractures are commonly over-investigated in St Luke’s hospital leading to a substantial financial burden on our health system. In this article we review the frequency of simple nasal fractures as well as the necessity or otherwise of nasal x-ray imaging in addition to the financial and health consequences that result from nasal x-ray imaging. These issues are also discussed from a legal perspective.peer-reviewe
Triggering of Imaging Air Cherenkov Telescopes: PMT trigger rates due to night-sky photons
Imaging air Cherenkov telescopes are usually triggered on a coincidence of
two or sometimes more pixels, with discriminator thresholds in excess of 20
photoelectrons applied for each pixel. These thresholds required to suppress
night-sky background are significantly higher than expected on the basis of a
Poisson distribution in the number of night-sky photoelectrons generated during
the characteristic signal integration time.
We studied noise trigger rates under controlled conditions using an
artificial background light source. Large tails in the PMT amplitude response
to single photoelectrons are identified as a dominant contribution to noise
triggers. The rate of such events is very sensitive to PMT operating
parameters.Comment: 19 pages, latex,epsf, 7 figures appended as uuencoded file, submitted
to Journal of Physics
High performance structures
Materials selection, structural geometry, proof testing and statistical screening, prestressing, and system energy as tools for designing optimum trusses and other high performance structure
Studies in prestressed and segmented brittle structures
Application of nonlinear bending theory to prestressed and segmented brittle structure
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