PERRET hydraulic shock absorbers are used on production lines to prevent end-of-travel impact at high speed. Capable of withstanding high temperatures and output rates, the absorbers come in a range of sizes, operating at temperatures up to 180C and frequencies at 4 Hz, with admissible impact speeds ranging from 0.3 to 4m/sec. To dissipate the mechanical energy of a moving mass, a laminar fluid flow is sent through the "operating clearance" between the piston and its compression chamber. This principle limits local heating of the fluid and increases the service life of the absorber.
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More often than not, with the purchase of a sports car comes the sacrifice of any sort of utility. In other words, you can forget about a large trunk, extra seats for the kids, and more importantly driving in snowy (or inclement) weather. But what if there was a vehicle that offered the best of both worlds; great handling and practicality?
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
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