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傅相锴 《西南师范大学学报(自然科学版)》1988,(3)
本文按立体化学进程对σ-H迁移和σ-C迁移反应过渡态的轨道拓朴类型进行了分类,并计算了反应过渡态的分子轨道能级以及相应反应的活化能. 相似文献
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Sound scattering in dense granular media 总被引:1,自引:0,他引:1
The sound propagation in a dense granular medium is basically characterized by the ratio of wavelength to the grain size. Two types of wave transport are distinguished: one corresponds to coherent waves in the long wavelength limit, the other to short-wavelength scattered waves by the inhomogeneous contact force networks. These multiply scattered elastic waves are shown to exhibit a diffusive characteristics of transport over long distances of propagation. Determination of the transport mean free path l^* and the inelastic absorption (Q^-1) allows the inference of the structural properties of the material such as the heterogeneity and internal dissipation. The relevance of our experiments for seismological applications is discussed. Moreover, we apply the correlation technique of the configuration-specific sound scattering to monitoring the dynamic behaviour of the granular medium (irreversible rearrangements) under strong vibration, shearing and thermal cycling, respectively. 相似文献
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