Electro-optic switch based on near-field-coupled quantum dots

The propagation of exciton polaritons in near-field-coupled quantum-dot (QD) chains is modeled by a density-matrix formalism. It is shown that at least for low-temperature operation it is possible using electronically controlled switching by the quantum-confined Stark effect in such QD chains to rival and outperform room-temperature CMOS electronics in footprint and switch energy, though not in speed.     

Optimization of flow-through cells for dialysis and other membrane separations in flow-injection analysis using a laminar flow model

The mass transfer in the liquid channels of flow-through dialysers can be described fairly accurately by a laminar flow model. The mass transfer resistance in the liquid channels was of the same magnitude as that of a cellulose acetate membrane for the most effective dialysis cell. Thin channels are therefore of importance both for efficiency and for low dispersion in flow injection. A cell with a pressed membrane support provided the lowest dispersion and pressure dependence. A computer-based model provides a means for the determination of membrane permeabilities.