Results 41 to 50 of about 59,062 (321)
Conic Section Elements Based on the Rational Absolute Nodal Coordinate Formulation
MathematicsThe construction of rational absolute nodal coordinate formulation (RANCF) elements is usually based on a linear transformation of non-uniform rational B-spline (NURBS) geometry.
Yaxiong Liu +3 more
doaj +1 more source
Least squares fitting of conic sections with type identification by NURBS of degree two [PDF]
, 1999 Fitting of conic sections is used in reflectometry, aircraft industry, metrology, computer vision, astronomy and propagation of sound waves [5]. So far numerical algorithms assume the type of the conic section to be known in advance.
H. Späth, I. Seufer
core
ARITHMETIC PROGRESSIONS ON CONIC SECTIONS [PDF]
International Journal of Number Theory, 2013 The set {1, 25, 49} is a 3-term collection of integers which forms an arithmetic progression of perfect squares. We view the set {(1, 1), (5, 25), (7, 49)} as a 3-term collection of rational points on the parabola y = x2whose y-coordinates form an arithmetic progression.
Alvarado, Alejandra, Goins, Edray Herber
openaire +2 more sources
Lessons Learned From a Delayed‐Start Trial of Modafinil for Freezing of Gait in Parkinson's Disease
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Objective Freezing of gait (FOG) in people with Parkinson's disease (PwPD) is debilitating and has limited treatments. Modafinil modulates beta/gamma band activity in the pedunculopontine nucleus (PPN), like PPN deep brain stimulation. We therefore tested the hypothesis that Modafinil would improve FOG in PwPD.
Tuhin Virmani +8 more
wiley +1 more source
Does any convex quadrilateral have circumscribed ellipses?
Open Mathematics, 2017 The past decades have witnessed several well-known beautiful conclusions on four con-cyclic points. With highly promising research value, we profoundly studied circumscribed ellipses of convex quadrilaterals in this paper.
Li Jia Hui +3 more
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On stable rationality of Fano threefolds and del Pezzo fibrations
, 2016 We prove that very general non-rational Fano threefolds which are not birational to cubic threefolds are not stably rational.Comment: 21 ...
Hassett, Brendan, Tschinkel, Yuri
core +1 more source
Advanced Engineering Materials, EarlyView.Copper‐based composites enhanced with carbon feature convenient mechanical properties and favorable electric conductivity. Processing via deformation and thermomechanical treatments can introduce advantageous microstructures further enhancing their performance. Herein, copper–graphene powder‐based composites are directly consolidated via rotary swaging
Radim Kocich +3 more
wiley +1 more source
A new model for the theta divisor of the cubic threefold [PDF]
, 2003 In this paper we give a birational model for the theta divisor of the intermediate Jacobian of a generic cubic threefold $X$. We use the standard realization of $X$ as a conic bundle and a $4-$dimensional family of plane quartics which are totally ...
Artebani, Michela +2 more
core +3 more sources
Microstructure Evolution of a VMnFeCoNi High‐Entropy Alloy After Synthesis, Swaging, and Annealing
Advanced Engineering Materials, EarlyView.The synthesis and processing (rotary swaging and annealing) of the novel VMnFeCoNi alloy is investigated, alongside the estimation of the grain size effect on hardness. Analysis of a wide grain size range of recrystallized microstructures (12–210 µm) reveals a low annealing twin density.
Aditya Srinivasan Tirunilai +6 more
wiley +1 more source
Suavizamiento de los vértices de un polígono por medio de un spline cónico
Revista Integración, 1997 We prove that every irreducible conic can be parametrically represented by two rational quadratic functions. An algorithm for smoothing the vertices of a poligonal by a conic spline with continuous tangent is proposed.
Victoria Hernádez Mederos
doaj