We consider a unit speed curve α in Euclidean four-dimensional space E and denote the Frenet frame by {T,N,B1,B2}. We say that α is a slant helix if its principal normal vector N makes a constant angle with a fixed direction U . In this work we give different characterizations of such curves in terms of their curvatures. MSC: 53C40, 53C50

In the title compound, C(14)H(15)NO(4), the bicyclic fragment and the ester group form a dihedral angle of 86.7 (2)°. Inter-molecular O-H⋯O and C-H⋯O hydrogen bonding connects mol-ecules into a helix along the crystallographic b axis.

A recent theoretical model by Andersson et al. proposes that soft gluons order themselves in the form of a helix at the end of the QCD cascades. The Authors of the model present a measure of the rapidity-azimuthal angle correlation, which they call screwiness. We searched for such a signal in DELPHI data, and found no evidence for screwiness.

Magnesium oxide-reinforced wood fiber composites (MgO/WF) are a new type of multifunctional material, which can be used in different occasions, such as shopping malls, hotels, and residential buildings. Referring to the relevant literature, there is no research on milling performance MgO/WF. In order better understand knowledge processability MgO/WF, three cutters with helix angles were this ex...

This paper presents kinematics form of pronation and supination movement. The algorithm Stewart platform motion can be used to create a new (or pronation) motion. Pronation taken as which has not any rotation on x-axis y-axis. In this case, only one parameter. Supination movement creates helix curve. Additionally, the correlation between angle extension is 1. allows us use artificial intelligen...