High-frequency absorption and gain in superlattices: Semiquasistatic approach

High Gain Conformal Super High Frequency Antenna

A high gain conformal antenna is proposed having E-shaped patch to be used in SHF frequency range. A comprehensive parametric study has been carried out to understand the effects of various dielectric substrate effects and to optimize the performance of the antenna. For various substrate materials the effect of dielectric constant, loss tangent, mass density, bulk conductivity is observed .Resu...

Nonlinear dynamics in superlattices driven by high frequency ac - fields

We investigate the dynamical processes taking place in nanodevices driven by high-frequency electromagnetic fields. We want to elucidate the role of different mechanisms that could lead to loss of quantum coherence. Our results show how the dephasing effects of disorder that destroy after some periods coherent oscillations, such as Rabi oscillations, can be overestimated if we do not consider t...

: metadiscourse in introduction sections of applied linguistics and physics research articles: exploring variation in frequency and type

abstract in written mode of language, metadiscourse markers are used commonly to help writers in general and academic writers in particular to produce coherent and professional texts. the purpose of the present study was to compare introduction sections of applied linguistics and physics articles regarding their use of interactive and interactional metadiscourse markers based on the model pro...

A High Gain Observer based LMI Approach

This paper deals with the observability analysis and the observer synthesis of a class of nonlinear systems. The observer that we consider has a constant gain and concerns a class of uniformly observable systems. A sufficient condition permitting to design such a constant gain observer is given. The calculation of this gain is based on LMI technics.Copyright c © 2008 IFAC

Phonon-pumped terahertz gain in n-type GaAs/AlGaAs superlattices