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Cellphones likely to be controlled with Touchless Gestures and charge themselves using Ambient Light

Smartphones and other devices will beable to use touchless gestures and will be able to charge themselves using ambient lights, all thanks to LED technology

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A Smartphone (representational Image), Pixabay
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New York, Feb 11, 2017: Cellphones and other devices could soon be controlled with touchless gestures and charge themselves using ambient light thanks to new LED displays that can both emit and detect light.

Made of tiny nanorods arrayed in a thin film, the LEDs could enable new interactive functions and multitasking devices.

“These LEDs are the beginning of enabling displays to do something completely different, moving well beyond just displaying information to be much more interactive devices,” said lead researcher Moonsub Shim, a professor at University of Illinois at Urbana-Champaign.

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“That can become the basis for new and interesting designs for a lot of electronics,” Shim said.

The tiny nanorods, each measuring less than five nanometres in diametre, are made of three types of semiconductor material.

One type emits and absorbs visible light. The other two semiconductors control how charge flows through the first material. The combination is what allows the LEDs to emit, sense and respond to light.

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The nanorod LEDs are able to perform both functions by quickly switching back and forth from emitting to detecting.

They switch so fast that, to the human eye, the display appears to stay on continuously, said the study published in the journal Science.

Yet the LEDs are also near-continuously detecting and absorbing light, and a display made of the LEDs can be programmed to respond to light signals in a number of ways.

For example, a display could automatically adjust brightness in response to ambient light conditions — on a pixel-by-pixel basis.

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“You can imagine sitting outside with your tablet, reading. Your tablet will detect the brightness and adjust it for individual pixels,” Shim said.

“Where there’s a shadow falling across the screen it will be dimmer, and where it’s in the sun it will be brighter, so you can maintain steady contrast,” Shim explained. (IANS)

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A lesson in the woods may boost kids’ learning

Moreover, the number of times the teacher had to redirect a student's attention to their work was roughly halved immediately after an outdoor lesson.

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Just sitting in classrooms makes children more dull. Wikimedia Commons
Just sitting in classrooms makes children more dull. Wikimedia Commons
  • To help students concentrate and learn more, teachers have found a new way of teaching them.
  • This technique of teaching outdoors will boost children’s mental capabilities to learn and remember.

Are your students unable to concentrate on their lessons in the classroom? Take them for outdoor learning sessions.

According to a study, a lesson in the lap of nature can significantly increase children’s attention level and boost their learning.

While adults exposed to parks, trees or wildlife have been known to experience benefits such as increased physical activity, stress reduction, rejuvenated attention and increased motivation, in children, even a view of greenery through a classroom window can have positive effects on their attention span, the researchers said.

The study showed that post an outdoor lesson, students were significantly more attentive and engaged with their schoolwork and were not overexcited or inattentive.

Taking students outside help them concentrate more. Wikimedia Commons
Taking students outside help them concentrate more. Wikimedia Commons

Moreover, the number of times the teacher had to redirect a student’s attention to their work was roughly halved immediately after an outdoor lesson.

“Our teachers were able to teach uninterrupted for almost twice as long at a time after the outdoor lesson and we saw the nature effect with our sceptical teacher as well,” said Ming Kuo, a scientist at the University of Illinois at Urbana-Champaign in the US.

For the study, published in the journal Frontiers in Psychology, researchers tested their hypothesis in third graders (9-10 years old) in a school.

A few minutes outside help students concentrate better. VOA
A few minutes outside help students concentrate better. VOA

Over a 10-week period, an experienced teacher held one lesson a week outdoors and a similar lesson in her regular classroom and another, more sceptical teacher did the same. Their outdoor “classroom” was a grassy spot just outside the school, in view of a wooded area.

A previous research suggested that 15 minutes of self-paced exercise can also significantly improve a child’s mood, attention and memory. IANS