Narrow Results

In this study Fermi–Walker derivative and according to the derivative Fermi–Walker parallelism and non-rotating frame concepts are given for some frames. First, we get the Frenet frame, the Darboux frame, the Bishop frame for any curve in Euclid space. Fermi–Walker derivative and non-rotating frame being conditions are analyzed for each of the frames along the curve. Then we proved the Frenet frame is non-rotating frame along the plane curves. Darboux frame which is a non-rotating frame along the line of curvature. Then we proved the Bishop frame is a non-rotating frame along the all curves.

In this paper, we introduce three new transformations and establish connections between moving non-null curves and soliton equations according to Bishop frame in Minkowski 3-space. Later we find formulas for differentials of these three new transformations associated with the nonlinear heat system and repulsive type nonlinear Schrödinger equation.

The main purpose of this paper is to investigate parallel frames of non-lightlike curves in Minkowski space-time. For this purpose, the relations between Frenet–Serret frame and parallel frame of a given non-lightlike curve are discussed in four different cases. Then, the curvature, first and second torsion functions κ(s), τ(s), σ(s) and principal curvature functions k₁(s), k₂(s), k₃(s) are expressed in terms of the angles α, β and θ.

In this work, we investigate relationships between Darboux and type-2 Bishop frames in Euclidean space. Then, we obtain the geodesic curvature of the spherical image curve of the Darboux vector of the type-2 Bishop frame. Also, we give transition matrix between the Darboux and type-2 Bishop frames of the type-2 Bishop frames of the spherical images of the edges ${\overrightarrow{N}}_1,{\overrightarrow{N}}_2$ and $\overrightarrow{b}$. Finally, we express some interesting relations and illustrate of the examples by the aid Maple programe.

In this paper, generalized Fermi–Walker derivative, generalized Fermi–Walker parallelism and generalized non-rotating frame concepts are given for Frenet frame, Darboux frame and Bishop frame for any curve in Euclidean space. Being generalized, non-rotating frame conditions are analyzed for each frames along the curve. Then we show that Frenet and Darboux frames are generalized non-rotating frames along all curves and also Bishop frame is generalized non-rotating frame along planar curves in Euclidean space.

In this paper, we define the Bishop frame of a null Cartan curve in Minkowski space-time ${𝔼}_1^4$. We obtain the Bishop’s frame equations of a null Cartan curve which lies in the timelike hyperplane of ${𝔼}_1^4$. We show that a null Cartan cubic lying in the timelike hyperplane of ${𝔼}_1^4$ has two Bishop frames, one of which coincides with its Cartan frame. We also derive the Bishop’s frame equation of the null Cartan curve which has the third Cartan curvature ${\kappa }_3(s)\ne 0$. As an application, we find a solution of the null Betchov-Da Rios vortex filament equation in terms of a null Cartan curve and its Bishop frame, which generates a timelike Hasimoto surface.

In the present paper, the relation between invariants of the pseudo null curves and the variational vector fields of semi-Riemannian manifolds is introduced. After that, the Killing equations are written in terms of the Bishop curvatures along the pseudo null curve. By means of this approach, Killing equations make allow to interpret the movement of charged particles within the magnetic field. Afterwards, as an application, pseudo null magnetic curves are defined using the Killing variational vector field. The parametric representations of all pseudo null magnetic curves are determined in semi-Riemannian space form. Moreover, various examples of pseudo null magnetic curves are illustrated.

In this work, we compute the time evolution equations (TEEs) of the type-1 Bishop frame of the curve. Also, we study the time evolution equations for type-1 Bishop curvatures (TEEBCs) as a system of partial differential equations (PDEs). Through this study, we give a necessary and sufficient condition for the normal and binormal Bishop velocities. Also, we construct new models of normal motions of inextensible curves in ${ℝ}^3$. These models are constructed for curves that move according to the type-1 Bishop frame. Also, we make a comparison study between surfaces obtained by the motions of inextensible curves according to the two frames, the type-1 Bishop frame and the Frenet frame.

In this paper, we construct a surface family possessing a Mannheim B-pair of a given curve as an asymptotic curve. Using the Bishop frame of the given Mannheim B curves, we present the surface as a linear combination of this frame and analyze the necessary and sufficient condition for a given curve such that its Mannheim B-pairs are both isoparametric and asymptotic on a parametric surface. The extension to ruled surfaces is also outlined. In addition, necessary and sufficient conditions have been given for the development of this ruled surface family. Finally, we present some interesting examples to show the validity of this study.