Wet moon dry Earth

Are Dry Mergers Dry, Moist, or Wet?

We present a spectral analysis of a sample of red-sequence galaxies identified by van Dokkum (2005) as dry merger remnants and ongoing dry mergers. Kinematics, stellar population absorption features, and ionisation from emission lines, are derived. We find that approximately half of the sample showing strong tidal features have younger stellar populations than a control sample at a given veloci...

Ringel’s Generalized Earth-moon Problem

A graph G has surface thickness n (S-thickness n) with respect to the surface S, if G can be decomposed into n and no fewer subgraphs by making n copies of the vertex set of G and then assigning each edge of G to one of the n copies so that n graphs result; each resulting subgraph of G must be S embeddable. The chromatic number of a graph G, denoted χ(G), is simply the fewest number of colors n...

Wet and Dry Etching Theory

Inhaled antibiotics: dry or wet?

Dry powder inhalers (DPIs) delivering antibiotics for the suppressive treatment of Pseudomonas aeruginosa in cystic fibrosis patients were developed recently and are now increasingly replacing time-consuming nebuliser therapy. Noninferiority studies have shown that the efficacy of inhaled tobramycin delivered by DPI was similar to that of wet nebulisation. However, there are many differences be...

Zircon from the Moon , Earth and Mars