We show here the existence of acoustic metamaterial, in which both the effective density and bulk modulus are simultaneously negative, in the true and strict sense of an effective medium. Our double-negative acoustic system is an acoustic analogue of Veselago's medium in electromagnetism, and shares many unique consequences, such as negative refractive index. The double negativity in acoustics ...

We discuss the linear gravitoelectromagnetic approach used to solve Einstein’s equations in weak-field and slow-motion approximation, which is a powerful tool explain, by analogy with electromagnetism, several gravitational effects solar system, where approximation holds true. In particular, we analogy, according can be written as Maxwell-like equations, focus on definition of fields non-statio...

We propose a new broadband search strategy for ultralight axion dark matter that interacts with electromagnetism. An oscillating field induces transitions between two quasi-degenerate resonant modes of superconducting cavity. In runs optimized high and low masses, this setup can probe unexplored parameter space axion-like particles covering fifteen orders magnitude in mass, including astrophysi...

This paper studies the multi-stage supply chain system (MSSCM) controlled by the kanban mechanism. In the kanban system, decision making is based on the number of kanbans as well as batch sizes. A kanban mechanism is employed to assist in linking different production processes in a supply chain system in order to implement the scope of just-in-time (JIT) philosophy. For a MSSCM, a mixed-integer...

We would like to build a general understanding of branes, the gauge fields to which they are coupled, and the gauge fields living on their world volume. First, we review electromagnetism in four dimensions. Define F (2) = dA as the field strength of the gauge field A. Then under a gauge transformation of the gauge field A by a total derivative d�, with � an arbitrary 0-form (or an arbitrary fun...

A modified system of equations of electrodynamics has been obtained. Beside the Lagrangian one an alternative gauge-like formalism has been developed to introduce the toroid moment contributions in the equations obtained. The two potential formalism that was worked out by us earlier has been developed further where along with the two vector potentials we introduce two scalar potentials thus tak...