I am particularly impressed by one aspect of their versatility; the fact the spatial orientation does not affect their operation. The fact that they can be installed vertically and yet still do not allow anything to flow through them under the influence of gravity definitely increases their reliability in sensitive medical design.
The implementation of a new diesel fuel standard in the US has considerably improved the environmental performance of diesel vehicles. The Environmental Protection Agency (EPA) says that the new ultra-low sulfur diesel (ULSD) fuel has combined with other improved technologies to reduce diesel's particulate matter (PM) emissions by 99%.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.