This paper has been analysed and compared the auxiliary plane method, shift projection plane method and rotative method with the graph, of which obtained the best method of simple facility, and proceeded analytic calculation.

There are several traditional methods for solving the shortest distance between two intersecting lines,but they must adopt the method of exchanging plane for twice.

The method of conversion surface has the merits of distinct conception and convenient application. But it is not able to solve if new projection surface was not right select.

By aid of the projective plane -change method,this paper presents a livin g example of application to solving the problem o f equilibrium of a spatial concurren t force system by the use of graphic solution,and verifies its advantag es.

This solution belongs to the class of parameterized solutions characterized by the property that the partial derivatives of the mapping function are rational in the auxiliary plane.

This makes the present technique more advantageous than other techniques, which require first the determination of a fictitious auxiliary plane-strain problem through the solution of an integral equation.

Based on the free streamline theory the problem reduces to solving a mixed boundary value problem and a Hilbert solution for the inverse problem in the auxiliary plane is obtained.

The auxiliary plane was determined to fit the records, and the range of possible auxiliary planes is indicated by dashed lines.

The main problem with this technique is positioning of the auxiliary plane in a single-ray domain.

The configurations of the conversion surface for optically positive and negative crystals are investigated.

The GEOID99 model replaces the GEOID96 model as the primary conversion surface between NAD 83 ellipsoid heights and NAVD 88 Helmert orthometric heights.

During ground test and calibration, the LENA imager was found to respond to neutral atoms with energies well above its nominal energy range of 10-750?eV, up to at least 3-4?keV, owing to sputtering interactions with its conversion surface.

Improved determination of heights using a conversion surface by combining gravimetric quasi-geoid/geoid and GPS-levelling height

The best solution, based on the least-squares collocation, provided a conversion surface for the transformation of GPS heights into normal height in Norway with an accuracy of about 5 cm.

On the base of how to define the conjugate rotative surface, in this paper we have presented and solved the problem of re-conjugate for the first time. This paper apply the methods of graphics and analytics. In the graphical method we have applied the synthetical projective translation which is a rotation should be applied in oonjunction with change the projective plane. In this method the straight line will be translate into a hyperbola, for any rotative surface can make it's re-conjugate rotative surface so...

On the base of how to define the conjugate rotative surface, in this paper we have presented and solved the problem of re-conjugate for the first time. This paper apply the methods of graphics and analytics. In the graphical method we have applied the synthetical projective translation which is a rotation should be applied in oonjunction with change the projective plane. In this method the straight line will be translate into a hyperbola, for any rotative surface can make it's re-conjugate rotative surface so long as it's equation or normal is given in this way. The re-conjugate of basic rotative surfaces such as the cylinder. cone and sphere are given by method of graphics and analytics. Finally, we may be applyed the theory to the design, machine and adjust of the oblique mill roller.

This paper has been analysed and compared the auxiliary plane method, shift projection plane method and rotative method with the graph, of which obtained the best method of simple facility, and proceeded analytic calculation. It makes shortest connective distance between two non-intersecting pipelines in space. From two sides of the shape and the number to be solved better

The author introduced the primary Contents of "proiect alteration method, statel her viewpoints on teaching theory about it and pointed out the major role of auxiliary projecting method (plane alteration method) in graphical drawing in this papero She also gave her suggestions for renewing the system of teaching material abo-ve and made a comparision between two different drawing methods and established an own auxiliary projecting method starting with the projection of points on to two planes and thus having...

The author introduced the primary Contents of "proiect alteration method, statel her viewpoints on teaching theory about it and pointed out the major role of auxiliary projecting method (plane alteration method) in graphical drawing in this papero She also gave her suggestions for renewing the system of teaching material abo-ve and made a comparision between two different drawing methods and established an own auxiliary projecting method starting with the projection of points on to two planes and thus having turned the complicated teachings of graphical drawing into an easy understanding one. lt is no doubt that this will be helpful for students to broad their intelligence, foster the ability analyzing and handling technical problems in the future