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Comparative evaluation of volume and helical four-dimensional computed tomography using canon system. [PDF]

open access: yesJ Appl Clin Med Phys
Kim C   +9 more
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QUASAR

ACM SIGMOD Record, 2004
Sensor devices are promising to revolutionize our interaction with the physical world by allowing continuous monitoring and reaction to natural and artificial processes at an unprecedented level of spatial and temporal resolution. As sensors become smaller, cheaper and more configurable, systems incorporating large numbers of them become ...
Iosif Lazaridis   +6 more
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Quasars

Applied Optics, 1966
A short historical outline of the discovery and a description of observed properties of quasars introduces questions as to their nature. Some of the principal arguments concerning their reality, distance, intrinsic properties and age lead to the conclusion that, while there is room for other points of view; a strong case can be made for the ...
openaire   +2 more sources

Quasars: The Observational Perspectives

2012
The empirical basis of quasar astronomy can be overawing especially in the twenty-first century. A first source of intricacy involves the nomenclature that has evolved to label the multifold phenomenological manifestations now united under the umbrella of active galactic nuclei (AGNs). A further complication involves observations of the many subclasses
D'ONOFRIO, MAURO   +23 more
openaire   +3 more sources

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