Results 11 to 20 of about 59,062 (321)
Edge detection and mathematic fitting for corneal surface with Matlab software
International Journal of Ophthalmology, 2017 AIM: To select the optimal edge detection methods to identify the corneal surface, and compare three fitting curve equations with Matlab software. METHODS: Fifteen subjects were recruited.
Yue Di, Mei-Yan Li, Tong Qiao, Na Lu
doaj +1 more source
Equivariant adjusted least squares estimator in two-line fitting model
Modern Stochastics: Theory and Applications, 2016 We consider the two-line fitting problem. True points lie on two straight lines and are observed with Gaussian perturbations. For each observed point, it is not known on which line the corresponding true point lies.
Sergiy Shklyar
doaj +1 more source
Energy Science & Engineering, 2023 A water jet with an air ring protective layer is a promising rock‐breaking and cutting rate improvement method in submerged environment, such as oil–gas drilling. The jet flow field characteristic determines the jet impinge performance and is affected by
Liang Zhang +5 more
doaj +1 more source
Safe domain and elementary geometry [PDF]
, 2004 A classical problem of mechanics involves a projectile fired from a given point with a given velocity whose direction is varied. This results in a family of trajectories whose envelope defines the border of a 'safe' domain.
Richard, J. -M.
core +4 more sources
A Nonstandard Generalization of Envelopes [PDF]
Al-Rafidain Journal of Computer Sciences and Mathematics, 2008 The generalized envelopes are studied by a given nonstandard definition of envelope of a family of lines defined in a projective homogenous coordinates PHC by: u(t)x + v(t)y + w(t)z = 0.
Tahir Ismail, Ibrahim Hamad
doaj +1 more source
Metals, 2020 Copper-clad aluminum rods are usually fabricated using hydrostatic extrusion, since during direct and indirect extrusion fracture of the copper sleeve is difficult to avoid.
Stefan Kuhnke +4 more
doaj +1 more source
Computational Complexity versus Statistical Performance on Sparse Recovery Problems [PDF]
, 2018 We show that several classical quantities controlling compressed sensing performance directly match classical parameters controlling algorithmic complexity.
Boumal, Nicolas +2 more
core +5 more sources
Geometrically rational real conic bundles and very transitive actions [PDF]
, 2009 In this article we study the transitivity of the group of automorphisms of real algebraic surfaces. We characterize real algebraic surfaces with very transitive automorphism groups.
Biswas +8 more
core +8 more sources
Study of Optical Models Regarding the Human Eye [PDF]
Iranian Journal of Medical Physics, 2011 Introduction: Until now, many models have been presented for optical study of the human eye. In recent years, surgery on the anterior section of the eye (such as cataract and photo-refractive surgery) has increased, so a study on the optics of the eye ...
Maryam Abolmasoomi +3 more
doaj +1 more source
A Unified General Theory of Conic Sections via the Conic Radical
MathematicsIn this paper, we bring forth several new general formulae in the classic study of conics in the Analytic Geometry: the coordinates of all vertices and focal points of arbitrary parabolas, ellipses, and hyperbolas; lengths for all latera recta from any ...
Mauricio Chávez-Pichardo +2 more
doaj +1 more source