To improve the performance of short-range wireless communications, channel quality must be improved by avoiding interference and multi-path fading. Frequency hopping spread spectrum (FHSS) is a transmission technique where the carrier hops from frequency to frequency. For frequency hopping a mechanism must be designed so that the data can be transmitted in a clear channel and avoid congested ch...

Conduction and dielectric behavior of Sr0.97(Ti12xFex)O32d solid solutions were studied. The temperature dependence of the dc conductivity with s}A exp(2BT) obtained, indicated a variable-range hopping mechanism. A low-frequency dielectric relaxation was also observed. The activation energy for the variablerange hopping conduction is slightly higher than that for dielectric relaxation, suggesti...

A mechanism called Eligibility Propagation is proposed to speed up the Time Hopping technique used for faster Reinforcement Learning in simulations. Eligibility Propagation provides for Time Hopping similar abilities to what eligibility traces provide for conventional Reinforcement Learning. It propagates values from one state to all of its temporal predecessors using a state transitions graph....

We propose a size effect which leads to the negative magnetoresistance in granular metal-insulator materials in which the hopping between two nearest neighbor clusters is the main transport mechanism. We show that the hopping probability increases with magnetic field. This is originated from the level crossing in a few-electron cluster. Thus, the overlap of electronic states of two neighboring ...

A mechanism called Eligibility Propagation is proposed to speed up the Time Hopping technique used for faster Reinforcement Learning in simulations. Eligibility Propagation provides for Time Hopping similar abilities to what eligibility traces provide for conventional Reinforcement Learning. It propagates values from one state to all of its temporal predecessors using a state transitions graph....

0039-6028/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.susc.2008.05.009 * Corresponding author. Present address: IPRT Department of Energy, 307D Wilhelm Hall, Ames, IA E-mail address: [email protected] (Y. Han) We obtain important energy parameters for understanding growth kinetics of a faceted Pb mesa. Specifically, extensive calculations of diffusion barriers are performed for a...

Recent experiments on the quantum Hall effect [1,2] and on the hopping transport in 2D Si MOSFETs [3] and delta-doped GaAs/AlGaAs heterostructures [4] show that prefactor so in the exponential temperature dependence of the hopping conductivity has, under certain conditions, a universal form (e/h)f(T/T0) with f ≈1 at T ≈ T0. Aleiner et al. [5] have remarked that such an effect can be due to hopp...

The mechanism of electron transfer in α-aminoisobutyric (Aib) homoligomers is defined by the extent of secondary structure, rather than just chain length. Helical structures (Aib units ≥3) undergo an electron hopping mechanism, while shorter disordered sequences (Aib units <3) undergo an electron superexchange mechanism.