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Constant tangential angle elected interest points

Ahmed Rebai, Alexis Joly, Nozha Boujemaa
2006 Proceedings of the 8th ACM international workshop on Multimedia information retrieval - MIR '06  
This paper presents a new interest points detector whose goal is to better catch visual attention than standard detectors.  ...  Centers of geometric forms or curves as well as junctions or vanishing points can be detected depending on the image content.  ...  We thus define the characteristic tangential angle ψ d of an interest point as: ψ d = π 2 − θ d (7) This angle is meaningfull since it determines the constant tangential angle of all the voters that have  ... 
doi:10.1145/1178677.1178706 dblp:conf/mir/RebaiJB06 fatcat:ecvpeamcp5fsvfyjwnsjnfve2e

ON THE RELATION BETWEEN TELLURIC CURRENTS AND THE EARTH'S MAGNETIC FIELD

James R. Wait
1954 Geophysics  
If the electric and mag- netic forces tangential to a surface S at a point P are mutually perpendicular, the ratio of the tangential electric force to the tangential magnetic force is termed the field  ...  The constants a, ¢, u are the conductivity, dielectric constant, and permeability of the lower medium.  ... 
doi:10.1190/1.1437994 fatcat:eihojhkbizaslb4xyvgul4sjqa

On the Doublets and Triplets in the SPectra of Different Elements

Yoshikatsu SUGIURA
1925 Proceedings of the Physico-Mathematical Society of Japan. 3rd Series  
[Ser. 3. vol. 7 x=6 and 9, that is to sty, at the points corresponding to calcium and strontium. As to the triplets terms, the slope is not so constant as in the case of the doublet terms.  ...  at the point P.  ...  According to Lande , s is constant and equal to 4, while in the first elements s=2 .  ... 
doi:10.11429/ppmsj1919.7.1_2 fatcat:yefm52zxc5dodjgxud2u6qy4a4

Gleanings Far and Near

1919 Mathematical Gazette  
If OT is the tangent at O to a curve I and 2 is a fixed point, the point T at unit distance from 0) in the direction OT traces the tangential indicatrix of [.  ...  If the spin of the plane O7'P were not wholly about O7’, the tangential image T would have a velocity at right angles to this plane in addition to its velocity in the direction ae =v fF or wv Sea ae Se  ... 
doi:10.2307/s0025557200117528 fatcat:mquwlq7v7zhtjprjsul5hz5yre

Radiation from ring quasi-arrays

H. Knudsen
1956 IRE Transactions on Antennas and Propagation  
Particular stress has been laid on an investigation of the field radiated from homogenous ring arrays of axial dipoles and homogeneous ring quasi-arrays of tangential and radial dipoles; i.e., systems  ...  of respectively axial, tangential, and radial dipoles placed equidistantly along a circle and carrying currents of the same numerical value but with a phase that increases uniformly along the circle.  ...  Homogeneous Ring Quasi-Array of Tangential, Linear Antennas with a Constant Current.  ... 
doi:10.1109/tap.1956.1144399 fatcat:e3jcstd4azaannjjx42vfcu45m

Problems and Solutions

1928 The American mathematical monthly  
“Line coordinates and point equations” by Assistant Professor Bunch. Eight new members were elected. May 12. Mathematics club picnic. May 26.  ...  This brief and interesting proof may at first sight appear to suffer from the fact that there is no real circle (H) for which ABC is self-polar if the triangle has only acute angles, and that it is not  ... 
doi:10.1080/00029890.1928.11986814 fatcat:essvzncgcvddtgy5tr6xziaibm

Theoretical and experimental studies of confined vortex flow

R. F. Reydon, W. H. Gauvin
1980 Canadian Journal of Chemical Engineering  
of interest, and not on the axial position of this point in the chamber (nor on the radius R of thé cone at the -particular axial position).  ...  constant if the flow was truly symmetrical.  ...  . " Near the centreline no effect of the inlet angle was -it i8 probable that a preferential spIral path could be identified , ~ich in turn',would be affected by the angle of inlet flow.  ... 
doi:10.1002/cjce.5450580603 fatcat:5sf5gcnrtbaqzclpub6cpkh7wi

TRANSITION CURVES FOR RAILWAYS. (INCLUDING APPENDIX)

J GLOVER
1900 Minutes of the Proceedings of the Institution of Civil Engineers  
Let 0 X be tangential to the curve at 0.  ...  P, may be found; the points P, . . . . P,, are on the curve, beaause for any point-the angle P, 0 K = .  ...  Let (a, b) and (h, k) be the co-ordinates of the points on the respective curves defined by r and a. : . e = 80 1' 28".  ... 
doi:10.1680/imotp.1900.18652 fatcat:q7rmcnabc5hnjie4tr6dgjyp4m

Geometrical Investigations concerning the Phaenomena of Terrestrial Magnetism: Second Series,--On the Number of Points at Which a Magnetic Needle Can Take a Position Vertical to the Earth's Surface

T. S. Davies
1830 Proceedings of the Royal Society of London  
The whole system of branches is comprised between the polar tangents; and the two systems are mutually tangential at the poles, and intersect each other at the cen tre; but they have no other point in  ...  to the magnet, drawn from its middle,-besides other properties not less interesting, though less capable of succinct enunciation.  ... 
doi:10.1098/rspl.1830.0228 fatcat:6k3ufeonkngbjp6wbcvj66bxze

Note on Normals and the Surface of Centres of an Algebraical Surface

Samuel Roberts
1871 Proceedings of the London Mathematical Society  
Having in the course of the year examined a great number of tables, collections of constants, &c, and never having met with the angle in question given to even a moderate number of places, I thought it  ...  Perpendicular Tangents to a Cardioid;" and " Elliptic Motion under Acceleration constant in direction:" Prof.  ... 
doi:10.1112/plms/s1-4.1.302 fatcat:hzhm3562xngcthdkpijpslsexi

Folding of Globular Proteins by Energy Minimization and Monte Carlo Simulations with Hydrophobic Surface Area Potentials

Christian Mumenthaler, Werner Braun
1995 Journal of Molecular Modeling  
For efficient energy minimization and molecular dynamics calculation the gradient of the solvent accessible surface areas with respect to Cartesian coordinates or torsion angles has to be calculated analytically  ...  When we started from random tertiary structures with preformed helices and maintained the helical segments by dihedral angle constraints, the final structures with the lowest energies resembled the native  ...  Ω is the angle between the two tangential vectors in these points, Φ is the angle defining the arc length and ρ k is the radius of the intersection circle.  ... 
doi:10.1007/s008940050001 fatcat:pp2pyv6gtnbszhb3ay7u57fowm

Minutes of the Fifty-Ninth Meeting

1912 Physical Review  
But since all bodies are imperfect reflectors there must be in all cases where the light is incident at an oblique angle a differential tangential force.  ...  P OYNTING has shown experimentally that when light is incident at an oblique angle on an absorbing body there is a tangential force as well as a normal pressure.  ... 
doi:10.1103/physrevseriesi.34.62 fatcat:6krd2tq2grebpku2l53shx7ife

Flagellar flows around bacterial swarms

Justas Dauparas, Eric Lauga
2016 Physical Review Fluids  
In particular, the model suggests that flagella are on average pointing radially out of the swarm and are not wrapped tangentially.  ...  The model provides further quantitative insight on the flagella orientations and their spatial distributions as well as the tangential speed profile.  ...  The final tangential flow speed of interest will then be denoted u (y). F.  ... 
doi:10.1103/physrevfluids.1.043202 fatcat:uhozfflzojdqpa7scyhutwmvi4

A test bed for a finite-difference time domain micromagnetic program with eddy currents

L. Yanik, E. Della Torre, M.J. Donahue
2004 Physica. B, Condensed matter  
This paper introduces a computational test bed for eddy current calculations and discusses some interesting analytic cases in this simplified geometry. r  ...  Since the eddy currents are bound by the shape of the material, the induced electric field has to be tangential to the boundary at all points on the boundary.  ...  We elected to overlay a Cartesian coordinate system on the cross section of the cylinder, as illustrated in Fig. 2 .  ... 
doi:10.1016/j.physb.2003.08.097 fatcat:ktwk62wqivbalmrew6oozqov5a

Speed variations in crank shafts

George P. Starkweather
1897 Journal of the Franklin Institute  
Subsequently the writer pursued the matter further, and thought the whole to be of sufficient interest to warrant a wider publication.  ...  square of the velocity at any point and that at the given point.  ... 
doi:10.1016/s0016-0032(97)90009-0 fatcat:caolgeuhhfc3jgfp6nj3szjkt4
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