Results 61 to 70 of about 1,852,152 (244)
, 1971 A crossword puzzle should be symmetrical. The diagram on the following page certainly is -- even though it looks more like a maze than a crossword ...
Beaman, Ralph G.
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Quantitative quality control of 3D water tank using image analysis
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Background and objective Accurate beam data acquisition using three‐dimensional (3D) water tanks is essential for beam commissioning and quality control (QC) in clinical radiation therapy. This study introduces a novel method for quantitative QC of the system, utilizing MV images and webcam videos.
Yuki Tanimoto +9 more
wiley +1 more source
Symmetries, Symmetry Breaking, Gauge Symmetries
, 2015 The concepts of symmetry, symmetry breaking and gauge symmetries are discussed, their operational meaning being displayed by the observables {\em and} the (physical) states. For infinitely extended systems the states fall into physically disjoint {\em phases} characterized by their behavior at infinity or boundary conditions, encoded in the ground ...
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Partial Dynamical Symmetry as an Intermediate Symmetry Structure
, 2003 We introduce the notion of a partial dynamical symmetry for which a prescribed symmetry is neither exact nor completely broken. We survey the different types of partial dynamical symmetries and present empirical examples in each category.Comment: 10 ...
Leviatan, A.
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Journal of Applied Clinical Medical Physics, EarlyView.Abstract Purpose This study aims to develop a CycleGAN based denoising model to enhance the quality of low‐dose PET (LDPET) images, making them as close as possible to standard‐dose PET (SDPET) images. Methods Using a Philips Vereos PET/CT system, whole‐body PET images of fluorine‐18 fluorodeoxyglucose (18F‐FDG) were acquired from 37 patients to ...
Yang Liu, ZhiWu Sun, HaoJia Liu
wiley +1 more source
Action minimizing solutions of the Newtonian n-body problem: from homology to symmetry
, 2002 An action minimizing path between two given configurations, spatial or planar, of the $n$-body problem is always a true -- collision-free -- solution.
A. Chenciner, Homology To Symmetry
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Claustrum Volume Is Reduced in Multiple Sclerosis and Predicts Disability
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Objective The claustrum is a small, thin structure of predominantly gray matter with broad connectivity and enigmatic function. Little is known regarding the impact of claustrum pathology in multiple sclerosis (MS). Methods This study assessed whether claustrum volume was reduced in MS and whether reductions were associated with specific ...
Nicole Shelley +5 more
wiley +1 more source
Computers & Mathematics with Applications, 1986 AbstractThe role of symmetry in geometry in universally recognized. The principal purpose of this article, on the other hand, is to show how it plays many significant, but varied, roles throughout the whole of mathematics. We illustrate this fact through characteristics examples; in most of these examples the mathematics is well known, but the symmetry
Jean Pedersen, Peter Hilton
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Symmetry and Surface Symmetry Energies in Finite Nuclei
, 2010 A study of properties of the symmetry energy of nuclei is presented based on density functional theory. Calculations for finite nuclei are given so that the study includes isospin dependent surface symmetry considerations as well as isospin independent ...
A. Bohr +6 more
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