The operation theory of thread algorithm that was proposed by IETF MPLS work group in 1999 is studied in this paper.

A new algorithm to calculate the near distance spot of adjacent well by using cylinder helix method;

Natural Parameter Method is a kind of new method of wellbore trajectory computation succeeding Cylinder Helix Method(Radius of Curvature Method) and Minimum Curvature Method.

However,when the difference between the deviation angles or azimuth angles of the two ends of an interval is zero,the formula of coordinate calculation of cylinder helix method needs to be specially treated for normal use;and when the difference between deviation angles or azimuth angles is very.

Steinhaus Dimension of Spirals;

On the Representation of Spiral by Normalized B-Basis;

Based on analysis of interpolation mechanism for parametric curve, in this paper, 2D and 3D spiral curves interpolation algorithms with constant feedrate are developed on the one hand and the contour errors and corresponding approximate calculation formulations are discussed on the other.

Calculation and Analysis of the Contact Strength of Logarithmic Spiral Profile Connection;

However, logarithmic spiral can be used to substitute for the Archimedes curve to solve such problems and guarantee the stability of cutter machinability.

The automatic generation of logarithmic spiral is achieved by means of the language of VBA embedded in AutoCAD.

Design and machining of an Archimedes spiral Fresnel lens;