For those scratching their heads over how to screen electronic components for RoHS-compliance, Soldertec part of the UK's Tin Technology suggests X-rays as a useful alternative to costly and destructive chemical testing. For well-known component suppliers, an accreditation certificate will probably be sufficient, but for suppliers with a vague pedigree, screening may be necessary.
Soldertec suggests using XRF (X-ray florescence). The procedure is quick, easy and non-destructive. The electrons in the shell of the elements present in a sample are disrupted by a low-energy X-ray, and each element responds by producing X-rays at a unique set of energies, which allows each element to be measured. The test takes as little as two minutes. As for limitations, the test is only capable of detecting materials close to the surface, and while it easily detects lead, mercury and cadmium, it cannot distinguish the specific materials PBB, PBDE or hexavalent chromium.
The promise of the Internet of Things (IoT) is that devices, gadgets, and appliances we use every day will be able to communicate with one another. This potential is not limited to household items or smartphones, but also things we find in our yard and garden, as evidenced by a recent challenge from the element14 design community.
If you didn't realize that PowerPoint presentations are inherently hilarious, you have to see Don McMillan take one apart. McMillan -- aka the Technically Funny Comic -- worked for 10 years as an engineer before he switched to stand-up comedy.
The first Tacoma Narrows Bridge was a Washington State suspension bridge that opened in 1940 and spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7, just four months after it opened.
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.