A brightness shift is demonstrated for moving ramp stimuli. The data suggest that the transient visual response to changing luminance is combined with the sustained response to produce an overall impression of brightness. We attribute the brightness shift to the saturation of the transient response: a limitation on the maximum transient when responding to rapid brightening or dimming. The brigh...

Hybrid halide perovskites exhibit nearly 20% power conversion efficiency, but the origin of their high efficiency is still unknown. Here, we compute the shift current, a dominant mechanism of the bulk photovoltaic (PV) effect for ferroelectric photovoltaics, in CH₃NH₃PbI₃ and CH₃NH₃PbI(3-x)Cl(x) from first-principles. We find that these materials give approximately three times larger shift curr...

Based on a novel class of orthogonal pulse pairs, new full-response quadrature-quadrature phase-shift keying (QPSK) signal format is proposed in the paper. The proposed full-response QPSK signals can provide higher spectral compactness than conventional fullresponse QPSK signal, minimum-shift keying signal and quadrature phase-shift keying signal.