The band structures of symmetrical Fibonacci sequences (SFS) composed of positive and negative refractive index materials are studied with a transfer matrix method. A new type of omnidirectional zero-<InlineEquation ID="Equ2"> <EquationSource Format="TEX">$\bar{n}$</EquationSource> </InlineEquation> gaps is found in the SFS. In contrast to the Bragg gaps, such an omnidirectional...</equationsource></inlineequation>

The piezoelectric photo-thermal (PPT) and the surface photo-voltage (SPV) spectra of GaAs/AlAs short-period superlattices (SPS)-confined GaAs single-quantum well (SQW) were measured. The electron nonradiative transitions within GaAs-SQW and subband of SPS were observed in the room-temperature...

We present a new exergoeconomic approach to optimize energy systems. After tracing the energy evolution and degradation within the system, a binary subsystem model is proposed and optimization strategies are introduced. The method is applied to optimization of the CGAM problem.