For crushable calcareous sand, the stress-dilatancy curve has a significant turning hook around peak stress ratio, contains main features of loading process, including phase transformation point and ratio point. However, more than half this hook, i.e., line after point, is usually ignored by known models. It difficult to directly establish model with such characteristics, since demonstrates tha...

Tunnel opening or excavation in the strain-softening rock masses primarily leads to initial stress release and deformation. The increasing plastic shear strain induces a nonlinear variation of dilatancy masses. Therefore, tunnel stability is strongly dependent on state behaviors In view this, this paper proposes an elastoplastic finite difference solution based triple-shear element (TS) unified...

Background: Many elderly individuals complain of difficulty in understanding speech in noise despite having normal hearing thresholds. According to previous studies, auditory training leads to improvement in speech-in-noise perception, but these studies did not consider the etiology, so their results cannot be generalized. The present study aimed at investigating the effectiveness of envelope-b...

We describe the contact network of granular packings by a frustrated lattice gas that contains steric frustration as esential ingredient. Two transitions are identified, a spin glass transition at the onset of Reynolds dilatancy and at lower densities a percolation transition. We describe the correlation functions that give rise to the singularities and propose some dynamical experiments. Let u...

We report a striking effect observed experimentally in several granular materials when shaken horizontally: The material displays a recurrent alternation between a slow inflation phase, characterized by an increase in its volume, and a fast collapse phase, when the volume abruptly returns to its original value. The frequency of such phase alternations is totally decoupled from the frequency of ...

In this paper a two-phase supply modulator suitable for envelope tracking power amplifier is presented. The designed supply modulator has the linear assisted switching architecture. Two-phase architecture is used in order to reduce the output switching ripples. The proposed architecture uses hysteretic control instead of pulse width modulation (PWM) which significantly reduces the circuit compl...