Windy Popples, Late October

Hadronic gamma-ray emission from windy microquasars

The jets of microquasars with high-mass stellar companions are exposed to the dense matter field of the stellar wind. We present estimates of the gamma-ray emission expected from the jet-wind hadronic interaction and we discuss the detectability of the phenomenon at high energies. The proposed mechanism could explain some of the unidentified gamma-ray sources detected by EGRET instrument on the...

Life and death near a windy oasis.

We propose a simple experiment to study delocalization and extinction in inhomogeneous biological systems. The nonlinear steady state for, say, a bacteria colony living on and near a patch of nutrient or favorable illumination ("oasis") in the presence of a drift term ("wind") is computed. The bacteria, described by a simple generalization of the Fisher equation, diffuse, divide A --> A + A, di...

New results on the Windy Postman Problem

In this paper we study the Windy Postman Problem. This is a well known Arc Routing Problem which contains the Mixed Chinese Postman Problem as a special case. We present here a full description of the polyhedron associated to the Windy Postman Problem over graphs with up to 4 vertices and 10 edges. We introduce two new families of facet-inducing inequalities and we prove that these inequalities...

Competitive Headwinds Blow Toward the Windy City

1 By: Team MOAB Gwyn Jones, Steve Neebe, Justin Owen, and Sam Snyder Introduction: For this study, we applied our game theory tools to evaluate the likely strategic moves by key players driving consolidation in the financial exchange sector. Recently, the Deutsche Borse, a major European exchange, signed a merger agreement with the flagship US exchange, the NYSE Euronext, with the goal that t...

Plowing with precedence: A variant of the windy postman problem