# Summary of #hplusroadmap IRC Discussion (June 8, 2009)

• Discussion of bond graphs and linear graph theory, with focus on canonical forms and state equations derived from matrix multiplication expressions for modeling dynamic systems.

• Exploration of state-space modeling approaches, including linear time-invariant state-space models and methods for converting between difference equations and state-space form.

• Sharing of resources on state-space control theory, including links to Stanford's resources on converting state-space forms and Wikipedia references.

• Reference to automated conceptual design of physical dynamic systems, with mention of a paper containing MATLAB code demonstrating derivation of state equations for a given system.

• Discussion of modeling assumptions in engineering, such as chemical engineers assuming instantaneous mixing or using discrete trays to model packed distillation columns.

• Brief exchange about graphics libraries for 2D development, with mentions of Allegro, SDL, and VTK as potential options.

• Reference to a mercury-based chemical reaction (mercury with sulfuric acid, an oxidizing agent, and an iron nail) that produces a beating motion effect.