本文从混合变分法原理着手，对弹性接触问题提出一种新的数学模式，并从中导出有限元的近似公式。
A new mathematical model for the non-Hertz contact problems is proposed based on the mixed variational principle. From this model, the finite element approximate formulae are derived.
本文用变分法以及ABCD定律，导出了锥形发散梯度折射率纤维透镜新的成象公式。
In tills paper, a new imaging formula for a conical defocusing GRIN fiber lens is derived by using the variational method and the ABCD law.
本文用变分法以及ABCD定律，导出了锥形发散梯度折射率纤维透镜新的成象公式。
In tills paper, a new imaging formula for a conical defocusing GRIN fiber lens is derived by using the variational method and the ABCD law.
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