Cool party trick: Van Arsdell's coffee cup stirling engine kit.
With the potential to achieve much higher efficiencies and run cleaner than internal combustion engines, Stirling engines—which use an external heat source to perform work—have long been a source of fascination for engineers. In fact, when Aeronautical Engineer Brent Van Arsdell first saw a friend of his running a Stirling engine on a bowlful of ice cubes, his first thought was, "I've got to build one myself." Since then, he has come up with ten different engine designs and "probably assembled a couple thousand engines by hand." And, he has made it his mission to educate the world about this unique engine design. Plus, he gets to show people the Ideal Gas Law in action! His company, American Stirling ( www.stirlingengine.com), develops Stirling engines for the educational market as well as demonstration kits. His most popular item: The MM-5 Coffee Cup Engine Kit, which includes all the components needed to build an engine that operates at 250 rpm on a Starbucks' espresso or 100 rpm on a bowl of Cherry Garcia ice cream. It's a great party trick, he says. As far as practical use, Van Arsdell says that his engines put out only a tiny amount of power—anywhere from 2 to 30 mW. The problem, says Van Arsdell: It's difficult to build a Stirling engine that puts out a high power density, and the cost would be prohibitive for many mainstream applications. In fact, if you know of a small Stirling engine that is cost-competitive with gas or diesel engines on a per kW-basis, Van Arsdell would like to hear from you at email@example.com.
What makes this movie stand out from the typical high school sports story is that the teenagers are undocumented immigrants, and the big game is a NASA-sponsored marine robotics competition. Like many other Hollywood movies, however, Spare Parts only tells part of the story. What the film shows -- and doesn’t show -- raises important issues affecting STEM education in the US.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Load dump occurs when a discharged battery is disconnected while the alternator is generating current and other loads remain on the alternator circuit. If left alone, the electrical spikes and transients will be transmitted along the power line, leading to malfunctions in individual electronics/sensors or permanent damage to the vehicle’s electronic system. Bottom line: An uncontrolled load dump threatens the overall safety and reliability of the vehicle.
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.