We present a deep VLA search for HI emission from the low-luminosity Virgo Cluster elliptical galaxy NGC 4476, which contains 1.1×10 8 M ⊙ of molecular gas in an undisturbed disk in regular rotation. No HI was detected. The rms noise in the final image corresponds to a 3σ column density sensitivity of 1.2×10 20 cm −2 at the position of NGC 4476, averaged over the 4 kpc beam. The total HI mass i...

We study the effect of homogenization on flame propagation in periodic excitable media, when the width of the flame is much smaller than the characteristic size of the heterogeneities.

To attract customers, manufacturers must design a large diversity of variants of products that suit to various requirements. But to reduce cost, manufacturers must reduce the diversity of components. We focus on part diversity, i.e. when two or more parts satisfy to the same need. Parts are described in several independent documents, or database, each one with its own information model. We clai...

In a recent paper [7] we interpreted configurational forces as necessary and sufficient dissipative mechanisms such that the corresponding Euler-Lagrange equations are satisfied. We now extend this argument for a dynamic elastic medium, and show that the energy flux obtained from the dynamic J integral ensures that the equations of motion hold throughout the body.