Results 11 to 20 of about 1,578,105 (322)
Education Sciences, 2023 This study deals with the concept of the observer in science education, which is currently significantly diminished at school. In the first part, we review the theoretical perspective of the concept, regarding its historical role in physics knowledge ...
Ben Stein, Hana Stein, Igal Galili
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The gravitational path integral from an observer’s point of view
Journal of High Energy PhysicsOne of the fundamental problems in quantum gravity is to describe the experience of a gravitating observer in generic spacetimes. In this paper, we develop a framework for describing non-perturbative physics relative to an observer using the ...
Ahmed I. Abdalla +3 more
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If Physics Is an Information Science, What Is an Observer? [PDF]
Information, 2012 Interpretations of quantum theory have traditionally assumed a “Galilean” observer, a bare “point of view” implemented physically by a quantum system.
Chris Fields
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Observer study-based evaluation of a stochastic and physics-based method to generate oncological PET images [PDF]
Medical Imaging, 2021 Objective evaluation of new and improved methods for PET imaging requires access to images with ground truth, as can be obtained through simulation studies.
Ziping Liu +7 more
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Covariant cosmography: the observer-dependence of the Hubble parameter [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 The disagreement between low- and high-redshift measurements of the Hubble parameter is emerging as a serious challenge to the standard model of cosmology. We develop a covariant cosmographic analysis of the Hubble parameter in a general spacetime, which
R. Maartens +4 more
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The Measurement Problem Is a Feature, Not a Bug–Schematising the Observer and the Concept of an Open System on an Informational, or (Neo-)Bohrian, Approach [PDF]
Entropy, 2023 I flesh out the sense in which the informational approach to interpreting quantum mechanics, as defended by Pitowsky and Bub and lately by a number of other authors, is (neo-)Bohrian.
Michael E. Cuffaro
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Distributed Anomaly Detection and Estimation over Sensor Networks: Observational-Equivalence and $Q$-Redundant Observer Design [PDF]
European Control Conference, 2022 In this paper, we study stateless and stateful physics-based anomaly detection scenarios via distributed estimation over sensor networks. In the stateful case, the detector keeps track of the sensor residuals (i.e., the difference of estimated and true ...
Mohammadreza Doostmohammadian +1 more
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The observer-dependent shadow of the Kerr black hole [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 Motivated by inclination of the Earth's orbit that is not located at galactic plane for observing the shadow of Sgr A*, we consider the black hole shadow for arbitrary inclinations and different velocities of observers.
Z. Chang, Qing-Hua Zhu
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Observer-study-based approaches to quantitatively evaluate the realism of synthetic medical images
Physics in Medicine and Biology, 2023 Objective. Synthetic images generated by simulation studies have a well-recognized role in developing and evaluating imaging systems and methods. However, for clinically relevant development and evaluation, the synthetic images must be clinically ...
Ziping Liu +9 more
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International Journal of Radiation Oncology, Biology, Physics, 2022 INTRODUCTION The delineation of target volumes and organs at risk is the main source of uncertainty in radiation therapy (RT)(1). Numerous inter-observer variability (IOV) studies have been conducted, often with unclear methodology and non-standardized ...
L. Guzene +6 more
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