Internally mixed soot, sulfates, and organic matter in aerosol particles from Mexico City K. Adachi and P. R. Buseck School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, USA Received: 7 April 2008 – Accepted: 14 April 2008 – Published: 22 May 2008 Correspondence to: P. R. Buseck (pbuseck@as...

In 1977 Stanley proved that the h-vector of a matroid is an O-sequence and conjectured that it is a pure O-sequence. In the subsequent years the validity of this conjecture has been shown for a variety of classes of matroids, though the general case is still open. In this paper we use Las Vergnas’ internal order to introduce a new class of matroids which we call internally perfect. We prove tha...

Let G be a multipartite multigraph without loops. Then G is said to be internally fair if its edges are shared as evenly as possible among all pairs of its partite sets. An internally fair factorization of G is an edge-decomposition of G into internally fair regular spanning subgraphs. A holey factor of G is a regular subgraph spanning all vertices but one partite set. An internally fair holey ...

The phenomenon of capillary condensation is studied through the weight change of condensed phase in an internally wetted porous pd catalyst pellet during the course of exothermic reacation of cyclohexane hydrogenation in a thermogravimetric analyzer (TGA). The direct measurement of condensed phase indicates that evaporation of condensed phase is confined to the macropores of catalyst pellet at ...

Stability is a central concept in exchange-based mechanism design. It imposes a fundamental requirement that no subset of agents could beneficially deviate from the outcome prescribed by the mechanism. However, deployment of stability in an exchange mechanism presents at least two challenges. First, it reduces social welfare and sometimes prevents the mechanism from producing a solution. Second...

There has been an increased interest in the variation diminishing properties of controlled linear time-invariant (LTI) systems and time-varying without inputs. In LTI systems, these have recently studied from external perspective $k$-positive Hankel operators. Such operators that diminish number sign changes (the variation) past input to future output if is at most $k-1$. For $k=1$, this coinci...