Ed Nauman owns a house situated just
uphill from some city-owned property that provides his yard with an endless
supply of pocket gophers. He has tried to defeat them from digging up his
yard, but without much success until he tried a siren with several annoying
tones. A simple timing circuit drives the siren with a low duty cycle. As Bill
Murray said in Caddyshack, "In
the immortal words of Jean Paul Sartre, 'Au revoir, gopher.'"
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.