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Showing posts with the label Learning Lounge : Green Light 1

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Seville

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SEVILLE Sevilla After living up to some wonderful moments at Granada, the birthplace of the renowned Spanish poet and playwright Federico Garcia Lorca, we decided to further our coadventure through the heartland of the southern Iberian Peninsula, composed of lowlands, mountains and valleys. You’ve got it right. To arrive at Seville, we traversed the fascinating Spanish heartland. The landscape presented some vistas composed of rustic plains, lowlands, winding roads through the Sierra and then vast stretches of olive orchards. About 200 years back, a couple of decades after Napoleon’s army plundered and destroyed parts of Alhambra, an American diplomat and writer, Washington Irving and his Russian counterpart traversed the path from Seville to Granada. It was highly adventurous then, because of the fact that the transport system at that time was horse-drawn carriages and muleteers. It was such that they could ‘wander among the romantic mountains of Andalusia’ (Tales of Alhamb...

The Millennium Light

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LED   ----- The Green Light                                                        ( Part 1)  In the light emission phenomenon known as electroluminiscence ,energy is released in the form of photons (light energy) when electrons combine with electron holes within the device.This was discovered by H.J.Round way back in 1907.It took almost 55 years before the first visible red LED was developed by Nick Holonyak Jr. while working in General Electric USA. He is also known as 'father of light emitting diode'.But for almost 40 years LED had very limited application as a light source due to its emission mainly in infrared and longer wavelength spectrum.The application of red LED was restricted to indicator light . It was Shuji Nakamura of Nichia Corporation who brought in the first high brightness blue LED. Since the be...