Results 91 to 100 of about 2,400,148 (182)

Some new properties of null curves on 3-null cone and unit semi-Euclidean 3-spheres

, 2015
The null curves on 3-null cone have the applications in the studying of horizon types. Via the pseudo-scalar product and Frenet equations, the differential geometry of null curves on 3-null cone is obtained.
Donghe Pei, Jianguo Sun
core  

Singularity Analysis of Lightlike Hypersurfaces Generated by Null Cartan Curves in Minkowski Spacetime

Axioms
This study investigates the singularity structures of lightlike hypersurfaces generated by null Cartan curves in Minkowski spacetime. We construct a hierarchical geometric framework consisting of a lightlike hypersurface LHβ, a critical lightlike surface
Xiaoming Fan, Yongsheng Zhu, Haijing Pan
doaj   +1 more source

A Study on a Partially Null Curve in E₂⁴

Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics, 2018
In this paper, we study with Frenet equations which are given in [3] of a partially null curve in Semi- Euclidean 4-space E₂⁴ with index 2. By using the Frenet equations, we give some theorem and corollary. A characterization of a  hyperbolic partially null curve in E₂⁴ is given. Additionally, we examine harmonic curvatures and curvatures of this curve
openaire   +3 more sources

CURVES AND AESTHETIC SURFACES GENERATED BY THE R-R-RTR MECHANISM [PDF]

Fiabilitate şi Durabilitate, 2013
Let’s consider a mechanism having two driving elements with revolving movements and a RTR dyad, with elements of null length and aesthetic tracks of a point are determined on a rod, for various linear movement laws of driving elements.
Liliana LUCA, Iulian POPESCU
doaj  

On Null Mannheım Curves in Mınkowskı Space

, 2018
This thesis consists of four chapters. The first chapter is devoted to the introduction section, the literature information about the studies on the Mannheim curves are given. In the second chapter, basic definitions and concepts have been given.
Umurhan, Nilüfer
core   +1 more source

Harmonic brightness oscillations point to magnetar giant flares in rare short gamma-ray bursts. [PDF]

Sci Adv
Chen RC, Gottlieb O, Zhang BB, Levin Y, Lai D, Yang J, Yin YI, Wang SN.   +7 more
europepmc   +1 more source

Distribution Patterns and Intraspecific Spatial Associations of Different Size Classes in <i>Krascheninnikovia ceratoides</i> (L.) Gueldenst. Populations Within the Tibetan Antelope Breeding Grounds of the West Kunlun Mountains. [PDF]

Plants (Basel)
Chen M, Huang K, Lai F, Jia X, Zhao D, Jia Y.   +5 more
europepmc   +1 more source

A Novel Approach for Analyzing Non-Proportional Hazards With Long-Term Survivors: The Defective Yang-Prentice Model. [PDF]

Biom J
Calsavara VF.
europepmc   +1 more source

One-Year Target Lesion Revascularization Prediction Shows Uncertain Incremental Accuracy After Competing-Death Exclusion [Letter]. [PDF]

Clin Epidemiol
Liu J.
europepmc   +1 more source

Water, sanitation, and hygiene and nutritional status of children under-5 years born to young mothers in Ghana: a spatial inequality analysis. [PDF]

Front Nutr
Ogum D, Salifu Y, Abubakari AR, Abiiro GA, Salifu T, Abukari JM, Lasong J.   +6 more
europepmc   +1 more source