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By Neil Hughes In an effort to make touchscreens less static, Apple has proposed that future iPhones and iPads could feature actuators that would provide haptic feedback to users, and also include sensors that would measure the force at which a user touches the screen. The concept was unveiled this week in a patent application discovered by AppleInsider entitled "Touch-Based User Interface with Haptic Feedback." The use of actuators underneath a touchscreen could allow users to actually feel elements on the screen, such as buttons or controls. The timing of the application being made public by the U.S. Patent and Trademark Office is interesting because one rumor from earlier this month incorrectly suggested Apple would introduce new haptic feedback technology in its third-generation iPad.
Boosting LED Efficiency: Zinc Oxide Microwires Improve Performance of Light-Emitting Diodes (LEDs) Through the Piezo-phototronic EffectResearchers have used zinc oxide microwires to significantly improve the efficiency at which gallium nitride light-emitting diodes (LED) convert electricity to ultraviolet light. The devices are believed to be the first LEDs whose performance has been enhanced by the creation of an electrical charge in a piezoelectric material using the piezo-phototronic effect. Georgia Tech Regents professor Zhong Lin Wang (right) and graduate research assistant Ying Liu study light-emitting diodes whose performance has been enhanced through the piezo-phototronic effect. (Click image for high-resolution version. Credit: Gary Meek) By applying mechanical strain to the microwires, researchers at the Georgia Institute of Technology created a piezoelectric potential in the wires, and that potential was used to tune the charge transport and enhance carrier injection in the LEDs.
Rensselaer researchers are aiming to improve the efficiencey of green LEDs. Credit: Rensselaer/C.
By EarthTechling's Pete Danko: Where there’s power being produced, there are researchers looking into how it might be harvested and put to use, no matter how small the amount.
Over the years, we've seen researchers develop some rather unorthodox energy harvesting systems, including photovoltaics (solar panels), piezoelectric materials that react to motion, and thermoelectrics that turn heat into electricity.
Entry for 'Land art generator' competition. Second Prize Winner. 2010.
Low Operating Voltage Superior Lifetime Even Under Extreme Conditions Very Large Operating-Temperature Range High Humidity Resistance Excellent Temperature Stability High Stiffness UHV Compatible to 10 -9 hPa Sub-Millisecond Response & Sub-Nanometer Resolution Application Examples Precision Mechanics and Mechanical Engineering NanoPositioning / High-Speed Switching Active and Adaptive Optics Vibration cancellation Pneumatic & Hydraulic Valves Metrology / Interferometry Life Sciences, Medicine and Biology
The world we live in is one where many people have poor eyesight, but surprisingly few can afford corrective lenses so that they can see clearly.
The problem with depending on one source of power in the drive toward the battery-free operation of small biomedical devices, remote sensors and out-of-the-way gauges is that if the source is intermittent, not strong enough or runs out altogether, the device can stop working. A small MIT research team has developed a low-power chip design capable of simultaneously drawing power from photovoltaic, thermoelectric, and piezoelectric energy sources. The design also features novel dual-path architecture that allows it to run from either onboard energy storage or direct from its multiple power sources.
Piezoelectric vs Electrostatic Ultrasonic transducers come in two basic types, piezoelectric and electrostatic. The main difference between the two is that piezoelectric transducers use a ceramic material whereas electrostatic transducers contain a thin metal membrane.
Researchers at MIT have developed a new chip that can continually and almost simultaneously draw energy from three different sources. The chip is designed to harness thermoelectric (heat), photovoltaic (light) and piezoelectric (movement) energy.
Elektronik Energy Harvesting Congress - Avnet Abacus – Energy harvesting applications to show at inaugural congress | ElectropagesMay 30 2012 - New Technologies and Energy Harvesting [More New Technologies and Energy Harvesting Articles]
Professor Zhong Lin Wang at Georgia Tech has been championing his work in exploiting the piezoelectric qualities of zinc oxide nanowires for years now with his so-called "nanogenerators".
Piezoelectric energy harvesters generate electricity depending on the amount of force used in compressing or deforming the material, the amount and type of deformation of the material's crystal structure and the speed or frequency of compressions or vibrations to the material. There are more than 200 appropriate materials which need careful selection for the particular application.
WASHINGTON: Charging your cellphone by taking a leisurely stroll might not be all that utopian but something of a working reality in the near future — thanks to a wafer-thin device embedded in the sole of your shoe. The device developed by scientists from the Lawrence Berkeley National Lab, harnesses harmless viruses to turn mechanical energy into electricity with the movement of your feet. They tested their approach by creating a ‘live’ generator that produces enough power to operate a small liquid-crystal display.