The expressions of load, displacement, stress and residual stress distribution for hole cold_extrusion process are established by using elastic_plastic theory.

利用弹塑性理论建立了孔冷挤压的载荷、位移、应力以及残余应力分布表达式；

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The results show that the stress and strain distribution around the cold worked hole are similar between the model and real object.

结果表明：带衬套挤压和不带衬套冷挤压时孔边载荷的分布，模型材料与原型实际挤压结果相似；

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According to the distribution of potential, electron and hole in the BNRT at different stages, the mechanism inducing S-type negative resistance characteristics is explained.

根据BNRT不同工作状态下的内部电势、电子浓度和空穴浓度分布，解释了其S型负阻特性的产生机理。

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