Results 21 to 30 of about 1,747,690 (166)

An Anti-Noise Fast Circle Detection Method Using Five-Quadrant Segmentation

Sensors, 2023
Extracting circle information from images has always been a basic problem in computer vision. Common circle detection algorithms have some defects, such as poor noise resistance and slow computation speed.
Yun Ou, Honggui Deng, Yang Liu, Zeyu Zhang, Xin Lan   +4 more
doaj   +1 more source

On pairs of equations in unlike powers of primes and powers of 2

Open Mathematics, 2017
In this paper, we obtained that when k = 455, every pair of large even integers satisfying some necessary conditions can be represented in the form of a pair of unlike powers of primes and k powers of 2.
Hu Liqun, Yang Li
doaj   +1 more source

Energy Momentum Tensor and Marginal Deformations in Open String Field Theory [PDF]

, 2004
Marginal boundary deformations in a two dimensional conformal field theory correspond to a family of classical solutions of the equations of motion of open string field theory.
A. Sen, A. Sen, A. Sen, A. Sen, A. Sen, Ashoke Sen, D. Gaiotto, H.T. Yang, J. Polchinski, M. Fujita, N. Lambert, N. Moeller, N. Moeller, P. Mukhopadhyay, P.H. Frampton, T. Takahashi, W. Taylor   +16 more
core   +2 more sources

Tunneling in cosine potential with periodic boundary conditions [PDF]

, 2013
In this paper we discuss three methods to calculate energy splitting in cosine potential on a circle, Bloch waves, semi--classical approximation and restricted basis approach.
Ambrozinski, Zbigniew
core   +2 more sources

Positioning Accuracy Model of Sailing‐Circle GPS‐Acoustic Method

Earth and Space Science, 2021
Sailing‐circle GPS‐acoustic method, prevalently applied for measuring ocean floor crustal deformation, allows the precise positioning of an underwater transponder in a global frame.
Xinhua Chen, Hongmei Zhang, Jianhu Zhao, Wenbiao Liang, Jie Feng   +4 more
doaj   +1 more source

Near-Solar-Circle Method for Determination of the Galactic Constants

, 2011
We propose a method to determine the galactic constants R_0 (distance to the Galactic Center) and V_0 (rotation velocity of the Sun) from measurements of distances, radial velocities and proper motions of objects near the solar circle.
Matsui, M., Nagayama, T., Nakagawa, A., Sofue, Y.   +3 more
core   +1 more source

A Graphical Method for Great Circle Routes

Polish Maritime Research, 2017
A great circle route (GCR) is the shortest route on a spherical earth model. Do we have a visual diagram to handle the shortest route? In this paper, a graphical method (GM) is proposed to solve the GCR problems based on the celestial meridian diagram ...
Hsu Tien-Pen, Chen Chih-Li, Hsieh Tsung-Hsuan   +2 more
doaj   +1 more source

Efficiency of a Voluntary Speed Reduction Algorithm for a Ship’s Great Circle Sailing [PDF]

TransNav, 2020
The great-circle is the shortest distance between two points on the surface of the earth. When planning a ship’s sailing route (waypoints and forward speeds) for a specific voyage, the great circle route is commonly considered as a reference route ...
Helong Wang, Wengang Mao, Leif Eriksson
doaj   +1 more source

A Diophantine Inequality Involving Mixed Powers of Primes with a Specific Type

Mathematics
Let λ1,λ2,λ3 be nonzero real numbers, not all of the same sign; let λ1/λ2 be irrational; and let η be any real number. We investigate the solvability of the inequality |λ1p1+λ2p2+λ3p32+η|0 in the prime variables p1, p2, and p3.
Tatiana L. Todorova, Atanaska Georgieva
doaj   +1 more source

Sets that contain their circle centers

, 2007
Say that a subset S of the plane is a "circle-center set" if S is not a subset of a line, and whenever we choose three noncollinear points from S, the center of the unique circle through those three points is also an element of S.
Martin, Greg
core   +2 more sources