从理论上探讨了结构地震倒塌模式，提出了以退化刚度比作为破坏参数的地震破坏模型。
The earthquake collapse mechanism of structures is discussed, and an earthquake damage model is proposed, in which the degradation stiffness ratio is used as a damage parameter.
退化树和正常树相比，矿质元素含量和荧光参数均没有明显差异。
No significant difference in mineral element contents and the parameters of chlorophyll fluorescence was found between normal tree and degenerated tree.
为了有效复原退化图像，需要从模糊图像中估计模糊函数的某些参数、噪声统计量等相关信息。
In order to restore blur image effectively, certain parameter of blur function and statistical value of noise have to be estimated.
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