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Common materials undergo a transverse contraction when stretched in one direction and a transverse expansion when compressed, which is called positive Poisson's ratio of material, such as Poisson's ratio of rubber is 0.475; in contrast, some materials undergo a transverse expansion when stretched in one direction and a transverse contraction when compressed, which is called negative Poisson ratio material, also called the auxetic materials, such as Poisson's ratio of yellow single crystal iron ore is -0.14.
Poisson's ratio is general in the range of -1 to 0.5 for isotropic continuous materials.
Nowadays, researchers have found and manufactured many kinds of auxetic materials, such as auxetic rock, foams, polymers, composites and so on.
Mechanics of Materials, 2011(43): 476-486. ][[] Wright JR, Burns MK, James E, et al.
The core materials were spandex filaments with three different diameters, and the wrap materials used were nylon filaments with the same count but different tensile modulus.

Acknowledgement We would like to express our appreciation to Chinese National Natural Science Foundation (51005228).
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Factors affecting the joint strength of brazed joints like external compressive weight, diffusion of filler material into the parent materials, surface roughness of parent materials, surface flatness have been discussed.
Brazing and soldering involves joining of two materials with the help of a third filler material.
The filler materials flow through capillary action.
Another important criterion for successful brazing is wetting of base materials by filler material.
Flow of filler materials is assisted by low angle of contact.

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Based on topographic map of Baiyao base and combining soil parent materials, region geography, vegetation, land use method, 214 sampling points were chosen relatively uniform with guarantee of density (Fig.1).
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This attribute can substantially reduce the cost of using machineable wax over other materials.
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