Design of Security Paper with Selective Frequency Reflection Characteristics

a comparison of teachers and supervisors, with respect to teacher efficacy and reflection

supervisors play an undeniable role in training teachers, before starting their professional experience by preparing them, at the initial years of their teaching by checking their work within the proper framework, and later on during their teaching by assessing their progress. but surprisingly, exploring their attributes, professional demands, and qualifications has remained a neglected theme i...

New UWB Shielding with Frequency Selective Surfaces

In this paper a Frequency Selective Surface (FSS) as a UWB electromagnetic shield is introduced. The proposed FSS comprises a quasi-J.C-Jerusalem Cross- and a copper ring, which are located at both sides of a FR4 substrate and can represent a S.E -Shielding Effectiveness- better than 20dB in 90% bandwidth of Ultra Wide Band frequency. This structure is compact and thin. Each cell comprises J.C ...

Reflection Paper

Reflection Paper P 4

With the fall of the Socialist block in 1989, the Cuban national economy collapsed, followed by a severe scarcity in gasoline, materials and especially food. Of Alamar, a New Town socialist housing project under construction in East Havana, only the areas dedicated to dwelling were finished, leaving the neighbourhood without a defined public space or economic centre. Due to the limited transpor...

Design methodology for efficient frequency conversion in Bragg reflection lasers

Bragg reflection waveguides are shown to be structures that can enable the integration of a laser and optically nonlinear medium within the same cavity for efficient frequency conversion. An effective and simple method of designing phase-matched laser structures utilizing transfer matrix analysis is described. The structures are first optimized in terms of laser performance and then for enhance...