Results 11 to 20 of about 12,552,614 (315)

No Time for Time from No-Time

open access: yesPhilosophy of Science, 2021
Programs in quantum gravity often claim that time emerges from fundamentally timeless physics. In the semiclassical time program, time arises only after approximations are taken. Here we ask what justifies taking these approximations and show that time seems to sneak in when answering this question.
Chua, Eugene Y. S., Callender, Craig
openaire   +3 more sources

Time perception: Brain time or event time? [PDF]

open access: yesCurrent Biology, 2001
Recent experiments show that synchronous events can appear to an observer to occur at different times. Neural processing time delays are offered as an explanation of these temporal illusions, but equating perceived time with processing time leads to some thorny philosophical problems.
Johnston, Alan, Nishida, Shin'ya
openaire   +2 more sources

Improved Conflict Detection for Graph Transformation with Attributes [PDF]

open access: yesElectronic Proceedings in Theoretical Computer Science, 2015
In graph transformation, a conflict describes a situation where two alternative transformations cannot be arbitrarily serialized. When enriching graphs with attributes, existing conflict detection techniques typically report a conflict whenever at least ...
Géza Kulcsár   +4 more
doaj   +1 more source

Sustainable Urban Drainage Systems: Themes of Public Perception—A Case Study

open access: yesLand, 2022
Climate adaptation measures address the challenges that densification and climate change impose on the urban environment. Sustainable urban drainage system (SUDS) constructs include the introduction of natural elements, such as riparian buffers ...
Bridget Thodesen   +2 more
doaj   +1 more source

Development of an Interference Filter-Stabilized External-Cavity Diode Laser for Space Applications

open access: yesPhotonics, 2020
The National Time Service Center of China is developing a compact, highly stable, 698 nm external-cavity diode laser (ECDL) for dedicated use in a space strontium optical clock. This article presents the optical design, structural design, and preliminary
Linbo Zhang   +6 more
doaj   +1 more source

Experimental Observation of the Suppression of the Dephasing in a Floquet Engineering Optical Lattice Clock

open access: yesApplied Sciences, 2022
Accurately manipulating quantum states is a fundamental strategy for improving the performance of quantum metrology, computing, and simulation. However, the quantum state is susceptible to dephasing due to the temperature and density of the atomic ...
Feng Guo   +3 more
doaj   +1 more source

Continuous-time games of timing [PDF]

open access: yesJournal of Economic Theory, 2005
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Vieille, Nicolas   +2 more
openaire   +7 more sources

An Evaluation of the Zeeman Shift of the 87Sr Optical Lattice Clock at the National Time Service Center

open access: yesApplied Sciences, 2020
The Zeeman shift plays an important role in the evaluation of optical lattice clocks since a strong bias magnetic field is applied for departing Zeeman sublevels and defining a quantization axis.
Xiaotong Lu   +4 more
doaj   +1 more source

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

open access: yesSatellite Navigation, 2021
The BeiDou Navigation Satellite System (BDS) provides global Positioning, Velocity, And Timing (PVT) services that are widely used in various areas. The BDS satellites frequently need the orbit maneuvers due to various perturbations to keep satellites in
Rui Tu   +5 more
doaj   +1 more source

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