The huge Maurice J. Tobin Bridge that links Boston and the communities to the north is just three years shy of its 60th birthday. Every morning and sometimes in the evening, the two and one quarter mile cantilevered truss bridge backs up with Boston’s famously awful bumper to bumper traffic. With the horrific Minneapolis I-35 bridge collapse last night, it makes one trapped in traffic on "The Tobin" all more nervous.
I have been mid-span which the roadway bump literally starts bouncing which is especially pronounced when a trick goes by. I’m told it’s supposed to do this to relieve stress. Nonetheless, it’s unnerving given you’re 135 feet above busy Boston Harbor represented at that point by the Mystic River. The sensation of potential danger is accentuated by a large and much publicized LNG depot about a fifth of a mile upriver.
And it’s an old bridge like many in America. On Sept. 10, 1973, an overloaded gravel truck was headed north and hit a bridge beam bringing down a section of the southbound roadway above. A similar accident occurred in 1995. Besides localized damage, the bridge as a whole stood tall. And 34 days after the 1973 accident, the bridge was threatened yet again by a giant fire that destroyed 18 city blocks in Chelsea, Mass.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
These are the toys that inspired budding engineers to try out sublime designs, create miniature structures, and experiment with bizarre contraptions using sets that could be torn down and reconstructed over and over.
PowerStream is deploying the microgrid at its headquarters to demonstrate how people can generate and distribute their own energy and make their homes and businesses more sustainable through renewables.
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.