Speed matches were obtained, using a spatial two-alternative forced-choice task, between a second-order motion stimulus and a first-order motion stimulus. The second-order motion stimulus was composed of contrast-modulated noise [produced by multiplying two-dimensional (2-d), static noise by a drifting, one-dimensional (1-d) sinusoid]. The first-order motion stimulus was composed of luminance-m...

We study the effect of localized sound-speed perturbations on global mode frequencies by applying techniques of global helioseismology on numerical simulations of the solar acoustic wave field. Extending the method of realization noise subtraction (e.g. Hanasoge, Duvall, and Couvidat, 2007) to global modes and exploiting the luxury of full spherical coverage, we are able to achieve very highly ...

Compared to other medical breast imaging techniques, ultrasonic imaging is more attractive due to its relatively low cost and wide clinical use. This study is concerned with clinical amplitude/velocity reconstruction imaging (CARI) ultrasonography for accurately detecting breast cancer using two acoustic properties: the sound speed and the attenuation. Bioacoustic modeling is used to describe u...

The amplitude of the photoacoustic effect for an optical source moving at the sound speed in a one-dimensional geometry increases linearly in time without bound in the linear acoustic regime. Here, use of this principle is described for trace detection of gases, using two frequency-shifted beams from a CO2 laser directed at an angle to each other to give optical fringes that move at the sound s...

In order to improve the comfort and dynamic sense of interior sound PEVs when driving at a constant speed, this paper carried out research on evaluation method quality EVs development an active generation system (ASGS). The investigation trend EV interiors were out. Combined with subjective methods test results, constant-speed vehicle design was proposed, which focused three dimensions: engine ...

Laminar mixing of glycerin in a chaotic mixer is carried by means of the blob deformation method. The mixer was a cylindrical vessel with two rotational blades which move along two different circular paths with a stepwise motion protocol. The flow visualization was performed by marking of the free surface of the flow with a tracer. The effects of controlling parameters such as rotational speed ...

If sufficiently irradiated by its central star, a protoplanetary disks falls into an equilibrium state exhibiting vertical shear. This state may be subject to a hydrodynamical instability, the ‘vertical shear instability’ (VSI), whose breakdown into turbulence transports a moderate amount of angular momentum while also facilitating planet formation, possibly via the production of small-scale vo...

We consider some structures where the harmonic ‘feeding’ wave localized at the crack faces can force the crack to grow. First, we present some results related to a lattice with a high-contrast layer, where the wave speed is larger than in the ambient matrix. The analytical solution obtained for the steadystate regime, where the crack speed is independent of the wave amplitude, is used to determ...