Results 251 to 260 of about 2,583,298 (291)

Null Surfaces of Null Curves on 3-Null Cone

Physics Letters, Section A: General, Atomic and Solid State Physics, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Donghe Pei, Jianguo Sun
exaly   +3 more sources

On the Cartan Curvatures of a Null Curve in Minkowski Spacetime

Geometriae Dedicata, 2005
The authors reconstruct the Cartan frame of a null curve in Minkowski space-time for an arbitrary parameter, and they characterize pseudo-spherical null curves and Bertrand null curves.
Ünver Çiftçi
exaly   +4 more sources

On the Null Distribution of the Precision and Recall Curve

open access: yes, 2014
Precision recall curves (pr-curves) and the associated area under (AUPRC) are commonly used to assess the accuracy of information retrieval (IR) algorithms. An informative baseline is random selection. The associated probability distribution makes it possible to assess pr-curve significancy (as a p-value relative to the null of random).
Miguel Lopes, Gianluca Bontempi
openaire   +3 more sources

Null curves in diffraction patterns

Applied Optics, 1977
We show that there is a large class of plane curves which never appear in partial form, as curves along which destructive interference takes place. These curves have an analytic property which, when combined with an analytic property of the free light field, gives rise to patterns of interference that are commonly observed.
openaire   +2 more sources

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