As the hearing continues the focus is on the type of epoxy used in the ceiling panels that collapsed in the Big Dig tunnel last summer.
Following a presentation outlining the fundamentals of epoxy. The conversation has now turned to the difference between "fast set" epoxies and standard epoxy. The epoxy used in the tunnel in question was a fast set epoxy. And the question now is whether in effect the wrong "glue" was used and was this information availalbe to the designers, project managers and suppliers. It’s a question of the load values in terms of the type of epoxy used, along with the long-term characteristics of fast set epoxy and the safety value factor of this type of adhesive in this type of structure. Was the epoxy used appropriate for the loads it was expected to hold?
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
Neil Fromer is the executive director of the Resnick Institute, a program for energy and sustainability at the California Institute of Technology, working to develop new ideas and research technologies related to providing a sustainable future. He spoke to us about the severity of the current drought in California and how solar energy can help prevent such situations in the future.
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.