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Recent developments in optical fiber communication have further opened the door to cost effective Wavelength Division Operation in metropolitan and access optical networks. To take advantage of the widened transmission window, broadly tunable optical distortionless filters must be developed to multiplex and demultiplex optical channels. Tunable optical filters are widely needed to manage channels at the optical layer in DWDM systems. One of the few technologies capable of such a large tuning range is liquid crystal (LC). The large anisotropy and low operational voltage make it an ideal...

The 11th Edition of Helping Children Learn Mathematics is designed to help those who are or will be teachers of mathematics in elementary schools help children develop understanding and proficiency with mathematics so they can solve problems. This text is built around three main themes; helping children make sense of mathematics, incorporating practical experiences and using research to guide teaching. It also integrates connections and implications from the Common Core Standards: Mathematics (CCSS-M).