What Makes me Love Sendai [JPlace Part 2]

Places during Autumn This is the part 2 of places I've visited in Japan. Now the weather is getting colder and colder :( So here's the places I explored in fall season. tohokudai festival. I can find lot of foods here. I can find almost all of the clubs in tohokudai in each classroom. a very delicious taiyaki Astronomy Club （天文学）  Red leaves during my trip to Ayashi...Fall is the best season  Sendai...

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Principle Of Light Emission And Laser Operation

The goal for this topics is: To give the reader understanding of the basic principles of light emitting diode and the laser (both are optical source used in optical communication) 1. BASIC PRINCIPLE OF LIGHT EMISSION AND LASER OPERATION 1.1 Mechanism of light emission internal energy : effective energy from outermost electron  Plank's constant : 6.625 x 10-34 J-s Energy levels and mechanism of transition are divided by three (see fig1.1): 1....

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