Wave field in two-phase media by the convolutional differentiator method

This paper applies the convolutional differentiator method, based on generalized Forsyte orthogonal polynomial （CFPD）, to simulate the seismic wave propagation in two-phase media. From the numerical results we can see that three types of waves, fast P-waves, S-waves and slow P-waves, can be observed in the seismic wave field. The experiments on anisotropic models demonstrate that the wavefront is elliptic instead of circular and S-wave splitting occurs in anisotropic two-phase media. The research has confirmed that the rules of elastic wave propagation in fluid-saturated porous media are controlled by Biot＇s theory. Experiment on a layered fault model shows the wavefield generated by the interface and the fault very well, indicating the effectiveness of CFPD method on the wavefield modeling for real layered media in the Earth. This research has potential applications to the investigation of Earth＇s deep structure and oil/gas exploration.

单端固定桥斜向受载三维位移的数字激光散斑技术研究

该实验旨在研究单端固定桥(CFPD)在斜向加载时的位移情况。采用新鲜离体比格犬下颌骨作为实验对象,制作CFPD,首次采用数字激光散斑技术测量CFPD在斜向加载时,不同加载量下的三维位移。结果表明:斜向加载桥体时,整个CFPD出现最大位移量,桥体位移量大于近缺隙侧基牙,近缺隙侧基牙大于远缺隙侧基牙;斜向加载基牙时,相应受载基牙位移量最大,桥体和邻近基牙次之。在斜向加载过程中,随着加载量的增加,位移量也增大。因此,可认为CFPD在使用过程中要避免斜向受力,尤其是桥体的斜向受力。此外,本研究还证实数字激光散斑技术是一种比较适合测量体积小而不规则形态物的三维位移的方法。

种植支持式单端固定桥斜向集中载荷下的三维位移

本实验旨在研究种植支持式单端固定桥(CFPD)斜向集中受载时的三维位移。采用比格犬下颌骨作为实验对象,即刻种植ITI种植体两枚,建立以两种植体为基牙的种植支持式CFPD,采用数字激光散斑技术测量其在斜向加载时不同加载量下的三维位移。结果表明:斜向加载桥体时,随着载荷量的增加,基牙和桥体的位移量随之增大。在相同载荷下,桥体位移量最大,近缺隙侧基牙位移量次之,远缺隙侧基牙位移量最小;斜向加载基牙时,相应受载基牙位移量最大,桥体和邻近基牙位移量次之。在相同加载条件下,加载基牙时CFPD的位移量较加载桥体时的位移量小。因此,可认为种植支持式CFPD是一种可行的修复方式,但是在使用过程中要避免斜向受力,尤其是桥体的斜向受力。