Results 261 to 270 of about 111,891 (295)
A decade of sub-arcsecond imaging with the International LOFAR Telescope. [PDF]
Astrophys Space SciMorabito LK +9 more
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A search for radio emission from a sample of optically selected quasars
, 1977 C. Fanti +5 more
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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
openaire +2 more sources
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
openaire +2 more sources
ACM SIGPLAN Notices, 2014
Cloud computing promises flexibility and high performance for users and high cost-efficiency for operators. Nevertheless, most cloud facilities operate at very low utilization, hurting both cost effectiveness and future scalability. We present Quasar, a cluster management system that increases resource utilization while providing consistently
Christina Delimitrou, Christos Kozyrakis
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Cloud computing promises flexibility and high performance for users and high cost-efficiency for operators. Nevertheless, most cloud facilities operate at very low utilization, hurting both cost effectiveness and future scalability. We present Quasar, a cluster management system that increases resource utilization while providing consistently
Christina Delimitrou, Christos Kozyrakis
openaire +1 more source
Cosmological constraints from the Hubble diagram of quasars at high redshifts
Nature Astronomy, 2018The concordance model (Λ cold dark matter (ΛCDM) model, where Λ is the cosmological constant) reproduces the main current cosmological observations1–4 assuming the validity of general relativity at all scales and epochs and the presence of CDM and of Λ ...
G. Risaliti, E. Lusso
semanticscholar +1 more source
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
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
2012The 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
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Proceedings of the 33rd Annual Computer Security Applications Conference, 2017
Computer security has long been an arms race between attacks and defenses. While new defenses are proposed and built to stop specific vectors of attacks, novel, sophisticated attacks are devised by attackers to bypass them. This rapid cycle of defenses and attacks has made it difficult to strategically reason about the protection offered by each ...
Richard Skowyra +4 more
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Computer security has long been an arms race between attacks and defenses. While new defenses are proposed and built to stop specific vectors of attacks, novel, sophisticated attacks are devised by attackers to bypass them. This rapid cycle of defenses and attacks has made it difficult to strategically reason about the protection offered by each ...
Richard Skowyra +4 more
openaire +1 more source
DESI 2024 III: baryon acoustic oscillations from galaxies and quasars
Journal of Cosmology and Astroparticle PhysicsWe present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1.
A. G. Adame +196 more
semanticscholar +1 more source