这是一个比较经典的时间简史——从大爆炸到黑洞.chm-This is a classic A Brief History of Time- From the Big Bang to black holes. Chm

用平面波展开法计算的二维光子晶体空气孔结构，TM和TE模式的能带图，matlab程序源代码-With the plane wave expansion method to calculate the two-dimensional photonic crystal structure of air holes, TM and TE modes of the energy band diagram, matlab source code

Cognitive radio is an intelligent technique used in wireless networks to take advantage of unused or underutilized spectrum. This may be performed by allocating secondary users in the spectrum holes in order to enhance the efficiency of radio r