LEDs produce light when incoming negatively charged electrons and positively charged "holes" attract each other and combine. The electrons and holes have a physical property called "spin" that rotates like the Earth rotating on its axis, but unlike the Earth they can spin in different directions. Physicists once believed that only 25% of the energy flowing into an LED could be emitted as light. Valy Vardeny, the physics chairman at the University of Utah, developed a test that indicates that 41 to 63% of the energy flowing into an LED can be converted to light using plastic LEDs made from organic materials called electrically conducting polymers and oligomers. Vardeny bombarded ten different plastics with microwaves, and found that materials that emit red and blue violet light emitted more light when placed in a magnetic field at cold temperatures. "The findings mean it should be possible to make more efficient light emitters for lasers, displays, and computer and television screens," says Vardeny. For more information, contact the University of Utah, Salt Lake City, UT 84112-9017; FAX: (801) 585-3350.
United Launch Alliance will fly 3D-printed flight hardeware parts on its rockets starting next year with the Atlas V. The company's Vulcan next-gen launch vehicle will have more than 100 production parts made with 3D printing. The main driver? Parts consolidation and 57% lower production costs.
The new small-form-factor EZ-BLE PRoC (Programmable Radio on Chip) module is a derivative of the existing PRoC BLE Programmable Radio-on-Chip solution. The EZ-BLE PRoC module integrates the programmability and ARM Cortex-M0 core of the PRoC BLE, two crystals, an onboard chip antenna, a metal shield, and passive components.
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.
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.