Results 21 to 30 of about 34,900 (289)
Semi-Automated Detection of Cerebral Microbleeds on 3.0 T MR Images. [PDF]
PLoS ONE, 2013 Cerebral microbleeds are associated with vascular disease and dementia. They can be detected on MRI and receive increasing attention. Visual rating is the current standard for microbleed detection, but is rater dependent, has limited reproducibility ...
Hugo J Kuijf +7 more
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Frontiers in Cell and Developmental Biology, 2023 Introduction: Periodic organ arrangements occur during growth and development and are widespread in animals and plants. In bilaterian animals, repetitive organs can be interpreted as being periodically arranged along the two-dimensional space and defined
Safiye E. Sarper +5 more
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Patterns of Symmetry Expression in Angiosperms: Developmental and Evolutionary Lability
Frontiers in Ecology and Evolution, 2020 Variation in flower symmetry is a remarkable aspect of flowering plant diversity. Multiple evolutionary transitions from an ancestral form of radial symmetry to bilateral symmetry and reversals from bilateral to radial symmetry have occurred during ...
Somayeh Naghiloo
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Symmetries of Trautman retarded radial coordinates [PDF]
Classical and Quantum Gravity, 2018 Abstract We consider spacetime described by an observer that uses a Trautman retarded radial coordinate system. Given a metric tensor, we find all the local symmetries of the coordinates. They set a 10D family that can be parametrized by Poincaré algebra.
Maciej Kolanowski, Jerzy Lewandowski
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Symmetries on manifolds: generalizations of the radial lemma of Strauss [PDF]
Revista Matemática Complutense, 2018 For a compact subgroup $G$ of the group of isometries acting on a Riemannian manifold $M$ we investigate subspaces of Besov and Triebel-Lizorkin type which are invariant with respect to the group action. Our main aim is to extend the classical Strauss lemma under suitable assumptions on the Riemannian manifold by proving that $G$-invariance of ...
Nadine Grosse, Cornelia Schneider
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About Frequency Characteristics of Electric Fields of Cylindrical Piezoceramic Antenna with Screen in the Form of an Open Ring Layer [PDF]
Журнал нано- та електронної фізики, 2016 According to rigorous method of “related” fields the analytical expressions to describe electric fields of cylindrical piezoceramic radiators, forming flat echolocation system was obtained. As a result of numerical analysis the quantity relations and the
O.I. Nyzhnyk, A.G. Leiko
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Floral symmetry affects bumblebee approach consistency in artificial flowers
Journal of Pollination Ecology, 2016 Bilateral symmetry has evolved from radial symmetry in several floral lineages, and multiple hypotheses have been proposed to account for the success of this floral plan.
Brett Matthew Culbert, Jessica Forrest
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Metals, 2023 An investigation of partial radial distribution functions and atomic pair potentials within a system has established that the existing potential functions are rooted in the assumption of a static arrangement of atoms, overlooking their distribution and ...
Jiulong Hang, Dongping Tao
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On tests for symmetry and radial symmetry of bivariate copulas towards testing for ellipticity [PDF]
Computational Statistics, 2020 AbstractVery simple non-parametric tests are proposed to detect symmetry and radial symmetry in the dependence structure of bivariate copula data. The performance of the proposed tests is illustrated in an intensive simulation study and compared to the one of similar more advanced tests, which do not require known margins.
Miriam Jaser, Aleksey Min
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, 2023 The influence of the properties of the profile of a radial static electric field E(r) on the evolution of an unstable ion temperature–gradient (ITG) drift wave in a nonuniformly rotating plasma column in a magnetic field is studied.
Alexei Yu. Chirkov, Dmitry N. Karbushev
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