has been developing III-nitride double heterostructures (DHs) with indium gallium nitride (InGaN) channels with a view to high-electron-mobility transistors (HEMTs) [Yi Zhao et al, Appl. Phys. Lett., vol105, p223511, 2014]. The resulting structures boast the highest reported mobility for InGaN channels and superior transport at high temperature, according to the research team. Nitride semicondu...

To investigate the spatial and temporal frequency tunings for stereopsis, we measured the contrast sensitivity for depth discrimination with variable spatiotemporal frequencies and disparities using drifting sinusoidal gratings. The results showed that the contrast sensitivity changed with the stimulus disparity and the disparity tuning function varied with the spatial frequency. The disparity ...

Space-time coding for the flat fading, quasistatic MIMO wireless channel has received wide spread attention. This paper treats space-time code design for frequency selective channels from a single carrier modulation perspective. We present a general framework for analyzing space-time codes for delay spread channels based on PEP analysis. It is shown that as in the flat fading case, diversity ga...

PURPOSE The contrast sensitivity function (CSF) provides a detailed description of an individual's spatial-pattern detection capability. We tested the hypothesis that the CSFs of people with low vision differ from a "normal" CSF only in their horizontal and vertical positions along the spatial frequency (SF) and contrast sensitivity (CS) axes. METHODS Contrast sensitivity for detecting horizo...

This paper proposes the use of a LoRa like chirp spread spectrum physical layer as basis for new Power Line Communication modulation scheme suited low-bandwidth communication. It is shown that robust communication can be established even in channels exhibiting extreme multipath interference, impulsive noise and low SNR (−40 dB), with synchronisation requirements relaxed compared to conventional...

The frequency selectivity of the P, NP I, and NP II channels of the four-channel model of mechanoreception for glabrous skin was measured psychophysically by an adaptation tuning curve procedure. The results substantially extend the frequency range over which the frequency selectivity of these channels is known and further confirm the hypothesis that the input stage of each of these channels co...

The last decades have been really hungry in new ways to reduce energy consumption. That is especially true when talking about wireless sensor networks in general and home multimedia networks in particular, since electrical energy consumption is the bottleneck of the network. One of the most energy-consuming functional block of an equipment is the radio front end, and methods to switch it off du...

Underwater acoustic communications are limited by the following channel impairments: time variability, narrow bandwidth, multipath, frequency selective fading and Doppler effect. Orthogonal Frequency Division Modulation (OFDM) is recognized as an effective solution to such impairments, especially when optimally designed according propagation conditions. On other hand, OFDM implementation requir...

So far, there have been introduced many front-end studies, but most of them fail to present, in a consistent way, how the signals are transformed throughout the front-end itself. In this paper, it is intended to introduce a unique presentation of spectrum and signal transformation within RF front-ends. This approach should help researches to have better insight into the high-level modeling and ...

The dendrites of CA1 pyramidal neurons in the hippocampus express numerous types of voltage-gated ion channel, but the distributions or densities of many of these channels are very non-uniform. Sodium channels in the dendrites are responsible for action potential (AP) propagation from the axon into the dendrites (back-propagation); calcium channels are responsible for local changes in dendritic...