We describe Pyomo, an open source software package for modeling and solving mathematical programs in Python. Pyomo can be used to define abstract and concrete problems, create problem instances, and solve these instances with standard open-source and commercial solvers. Pyomo provides a capability that is commonly associated with algebraic modeling languages such as AMPL, AIMMS, and GAMS. In co...

This paper describes a conscious attempt to use metaphor to both promote, and also reinterpret, ideas and values from the global Free and Open Source Software movement in the context of South Africa. A case study is given of an initiative launched by South African Council for Industrial and Scientific Research to stimulate awareness and promote the use of Free and Open Source Software in South ...

S U M M A R Y Inhomogeneous noise sources surrounding stations produce asymmetric amplitudes in crosscorrelation functions that yield preferential source directions. Here we show that preprocessing biases the dominant source direction estimate towards the source producing long-duration signals by down-weighting high-amplitude signals. Tests with both synthetic data and observations show that co...