Results 31 to 40 of about 262,918 (303)

Improved RANSAC Point Cloud Spherical Target Detection and Parameter Estimation Method Based on Principal Curvature Constraint

Sensors, 2022
Spherical targets are widely used in coordinate unification of large-scale combined measurements. Through its central coordinates, scanned point cloud data from different locations can be converted into a unified coordinate reference system.
Qinghua Wu, Jiacheng Liu, Can Gao, Biao Wang, Gaojian Shen, Zhiang Li   +5 more
doaj   +1 more source

DETERMINATION OF COORDINATES OF THE BASIC POINTS OF THE ILLUMINATED PART OF THE SPHERICAL PLANET'S VISIBLE DISC

Odessa Astronomical Publications, 2017
The formulae for determination of planetocentric coordinates of the basic points of an illuminated part of the visible disc of a spherical planet in projection onto the plane of the sky are derived. The formulae are deduced from general expressions using
V. V. Mikhalchuk
doaj   +1 more source

Cylindrical, spherical and toroidal layering of smectic C liquid crystals [PDF]

, 2001
This article examines static solutions to the smectic C continuum equations of Leslie et al.(1) for a variety of layer geometries. In particular it is shown that valid molecular configurations exist for cylindrical, spherical and toroidal layers ...
McKay, Geoff
core   +2 more sources

Evolution equations of translational-rotational motion of a non-stationary triaxial body in a central gravitational field [PDF]

Theoretical and Applied Mechanics, 2020
The translational-rotational motion of a triaxial body with constant dynamic shape and variable size and mass in a non-stationary Newtonian central gravitational field is investigated. Differential equations of motion of the triaxial body in the relative
Minglibayev Mukhtar, Prokopenya Alexander, Baisbayeva Oralkhan   +2 more
doaj   +1 more source

Simplified method for analytically determining the external magnetostatic field of uncertain extended technical objects based on near-field measurements

Electrical engineering & Electromechanics
Introduction. An important scientific and technical problem of magnetism of uncertain extended energy-saturated objects - such as naval vessels and submarines is implementation of strict requirements for magnetic silence based on mathematical modeling of
B. I. Kuznetsov, T. B. Nikitina, I. V. Bovdui, K. V. Chunikhin, V. V. Kolomiets, I. V. Nefodova   +5 more
doaj   +1 more source

One-parameter Lorentzian spatial kinematics and Disteli's formulae

AIMS Mathematics, 2023
In this paper, based on the E. Study map, clear terms are offered for the differential equations of one-parameter Lorentzian spatial kinematics that are coordinate system-independent.
Awatif Al-Jedani, Rashad A. Abdel-Baky
doaj   +1 more source

Elastodynamics of radially inhomogeneous spherically anisotropic elastic materials in the Stroh formalism

, 2011
A method is presented for solving elastodynamic problems in radially inhomogeneous elastic materials with spherical anisotropy, i.e.\ materials such that $c_{ijkl}= c_{ijkl}(r)$ in a spherical coordinate system ${r,\theta,\phi}$.
Hu H. C., Jolliffe A. E., Lekhnitskii S. G., Morse P. M., Pease M. C., Ting T. C. T., Wasow W., Wu J. J.   +7 more
core   +1 more source

Racah Polynomials and Recoupling Schemes of $\mathfrak{su}(1,1)$ [PDF]

, 2015
The connection between the recoupling scheme of four copies of $\mathfrak{su}(1,1)$, the generic superintegrable system on the 3 sphere, and bivariate Racah polynomials is identified. The Racah polynomials are presented as connection coefficients between
Post, Sarah
core   +1 more source

The quantum angular Calogero-Moser model [PDF]

, 2013
The rational Calogero-Moser model of n one-dimensional quantum particles with inverse-square pairwise interactions (in a confining harmonic potential) is reduced along the radial coordinate of R^n to the `angular Calogero-Moser model' on the sphere S^{n ...
Feigin, Mikhail, Lechtenfeld, Olaf, Polychronakos, Alexios P.   +2 more
core   +3 more sources

Towards the Final Fate of an Unstable Black String [PDF]

, 2003
Black strings, one class of higher dimensional analogues of black holes, were shown to be unstable to long wavelength perturbations by Gregory and Laflamme in 1992, via a linear analysis.
B. Kelly, E. Seidel, Frans Pretorius, G. Horowitz, G.T. Horowitz, G.T. Horowitz, H.A. Shinkai, Hugo Villegas, Ignacio (Iñaki) Olabarrieta, J. Geddes, J. Libson, J. Masso, J. Thornburg, L. Lehner, L. Lehner, Luis Lehner, Matthew Choptuik, N. Itzhaki, O. Aharony, R. Gregory, R. Gregory, R. Wald, Roman Petryk, S. Gubser, S. Hughes, T. Wiseman   +25 more
core   +2 more sources