منابع مشابه
Supernova pencil beam survey
Type Ia supernovae (SNe Ia) can be calibrated to be good standard candles at cosmological distances. However, at z > ∼ 1, gravitational lensing leads to significant level of noise in a SN Hubble diagram. We propose a pencil beam survey of SNe Ia which would yield a significant number of SNe in redshift bins of 0.1 for z up to 2. The SN number count can provide a direct probe of cosmology which ...
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The growing sophistication in radiation treatment strategies requires the utilization of increasingly accurate, but computationally intense, dose algorithms, such as the electron pencil-beam redefinition algorithm (PBRA). The sequential implementation of the PBRA is in production use at the MD Anderson Cancer center. The PBRA is difficult to parallelize because of the large amounts of data invo...
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Motivated by a desire to understand the size distribution of objects in the Kuiper belt, an observing program has been conducted at the CFHT and Palomar 5-m telescopes. We have conducted pencil-beam searches for outer solar system objects to a limiting magnitude of R 26. Fields were searched using software recombinations of many short exposures shifted at diierent angular rates in order to dete...
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Proton, as well as other ion, beams applied by electro-magnetic deflection in pencil-beam scanning (PBS) are minimally perturbed and thus can be quantified a priori by their fundamental interactions in a medium. This a priori quantification permits an optimal reduction of characterizing measurements on a particular PBS delivery system. The combination of a priori quantification and measurements...
متن کاملPencil beam all-optical ultrasound imaging
A miniature, directional fibre-optic acoustic source is presented that employs geometrical focussing to generate a nearly-collimated acoustic pencil beam. When paired with a fibre-optic acoustic detector, an all-optical ultrasound probe with an outer diameter of 2.5 mm is obtained that acquires a pulse-echo image line at each probe position without the need for image reconstruction. B-mode imag...
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ژورنال
عنوان ژورنال: RADIOISOTOPES
سال: 2019
ISSN: 0033-8303,1884-4111
DOI: 10.3769/radioisotopes.68.383