Results 231 to 240 of about 81,975 (261)
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Point-of-care ultrasound use in umbilical line placement: a review
Journal of Perinatology, 2019Point-of-care ultrasound (POCUS) has become a novel tool for assessing umbilical catheter tip location in the neonate. This review analyzes the current evidence on the efficacy and utility of POCUS for identifying umbilical catheter positioning. Medline, EMBASE, and Cochrane searches were performed until October 2018.
Eileen Cowan, Adam Bauer, Rya N Meinen
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On Umbilic Points on Newly Born Surfaces
Bulletin of the Brazilian Mathematical Society, New Series, 2017The authors show that newly born surfaces in 3-space have 4 and only 4 umbilic points. Umbilics are points on a surface where the curvature is the same in any direction. That is, locally, the surface is spherical. Here, a newly born surface is characterized as a surface created from a function with Morse singularity of index either 0 or 3.
Masaru Hasegawa, Farid Tari
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Umbilic point screening in random optical fields
Optics Letters, 2007Umbilic points--singular points of curvature characterized by a fractional topological charge q=+/-1/2--are the most numerous of all special points in the landscape of random optical fields (speckle patterns), outnumbering maxima, minima, saddle points, and optical vortices.
Isaac, Freund +2 more
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Lines of curvature and umbilical points for implicit surfaces
Computer Aided Geometric Design, 2007zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Che, Wu-Jun +2 more
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Umbilic points on Gaussian random surfaces
Journal of Physics A: Mathematical and General, 1977An umbilic point U on a surface Sigma is a place where the two principal curvatures of Sigma are equal. U is a singularity of Sigma in three different senses: (i) it is the source of elliptic (E) or hyperbolic (H) umbilic catastrophes in the envelope of normals ('focal surface') of Sigma ; (ii) it has index +or-1/2 depending on whether the principal ...
Berry, M. V., Hannay, J. H.
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An Isolated Umbilical Point of the Graph of a Homogeneous Polynomial
Geometriae Dedicata, 2000Consider a homogeneous polynomial \(f\) in two real variables \(x,y\) of degree \(k\geq 3\) whose graph \((x,y,f(x,y))\) in \(\mathbb{R}^3\) has the origin \(o\) as an isolated umbilic point. It is proved, that the index \(l\) of \(o\) belongs to the set \(\{1,0, \dots, 1-k/2\}\) if \(k\) is even or \(\{1/2,-1/2, \dots, 1-k/2\}\) if \(k\) is odd ...
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Umbilical venous catheter extravasation diagnosed by point-of-care ultrasound
Archives of Disease in Childhood - Fetal and Neonatal Edition, 2020A 24-week gestational age neonate with severe respiratory distress syndrome was managed with high-frequency oscillatory ventilation and inotropes. Umbilical artery catheter and umbilical venous catheter (UVC) were inserted on day 1. UVC aspirated blood freely at the time of insertion and followed a straight course on abdominal X-ray (AXR).
Gauthamen Rajendran, Ajay Kumar Sinha
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Riemann Problem for Conservation Laws with an Umbilic Point
2003We study the Riemann problems for 2 × 2 conservation laws with a hyperbolic singularity. The flux are a pair of quadratic functions where the char acteristic speeds are equals and the Jacobian matrix is diagonal at the hyperbolic singularity i.e. umbilic point. Discontinuous solutions will be considered.
Fumioki Asakura, Mitsuru Yamazaki
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Linear Interpolation of Shape Operators for Umbilical Points Through Local Parametrization
SSRN Electronic Journal, 2022zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Hyperbolic Conservation Laws with Umbilic Points I
1992Abstract : In this paper a compactness framework for approximate solutions to nonlinear hyperbolic systems with umbilic points is established by combining ideas in modern nonlinear analysis with classical methods, and by a detailed analysis of a highly singular Euler-Poisson-Darboux-type equation.
Pui T. Kan, Gui-Qiang Chen
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