One or more flow control modules, implemented on various types of network topologies, provide a number of functionalities for controlling the flow of IP packets over a network connection. , thus obtaining a shifted synthesis gas ; purification of said shifted synthesis gas including at least a step of pressure-swing adsorption to remove residual carbon oxides and methane from the synthesis gas, obtaining a purified synthesis gas, and optionally, addition of nitrogen to said purified synthesis gas, thus obtaining ammonia synthesis gas with a desired hydrogen to nitrogen ratio. For example, the processor state may include whether or not the processor is in a sleep state, whether or not interrupts are enabled, whether or not the processor has responded to previous interrupts, etc. The intermediate section may be axially expandable upon the introduction of a substance into a port that may be located in either of the first and second end members or the intermediate section.