We study the longitudinal instabilities of two interpenetrating fluids interacting only through gravity. When one of the constituents is of relatively low density, it is possible to have a band of unstable wavenumbers well separated from those involved in the usual Jeans instability. If the initial streaming is large enough, and there is no linear instability, the indefinite sign of the free en...

Abstract Emulsion explosive has been widely used in underwater blasting construction. To study the effect of perlite content on performance emulsion explosives under deep water conditions, with different applied pressures and contents was studied by using self-built explosion test system. The results show that, increase pressure water, energy as sensitizer a decreasing trend, which is consisten...

With the explosive growth in portable applications, power efficient computing in a Digital Signal Processor (DSP) is becoming a significant and challenging area of research. Clock-less or asynchronous timing is applied to eliminate clock generation, buffering and distribution at the system level. This paper presents the energy efficient functional unit for an asynchronous DSP implemented on fou...

We propose a new type of concrete for the attenuation of elastic waves induced by dynamic excitation. In this metamaterial, which we call metaconcrete, the stone, sand, and gravel aggregates of standard concrete are replaced with spherical inclusions consisting of a heavy metal core coated with a soft outer layer. These engineered aggregates can be tuned so that particular frequencies of a prop...