Interevent-time distribution and aftershock frequency in non-stationary induced seismicity

The initial footprint of an earthquake can be extended considerably by triggering of clustered aftershocks. Such earthquake–earthquake interactions have been studied extensively for data-rich, stationary natural seismicity. Induced seismicity, however, is intrinsically inhomogeneous in time and space and may have a limited catalog of events;...

The intrinsic conductivity of nanosized semiconducting crystals

We show how the dielectric response of powders of semiconducting nanocrystals can be used to extract the intrinsic conductivity of the nanocrystals. The method is applied to powders of nanocrystals of semi-conductive aquocyanophthalocyaninatocobalt (III) (Phthalcon-11), a promising filler material for conducting composites, and published data of...

The optimal structure-conductivity relation in epoxy-phthalocyanine nanocomposites

Phthalcon-11 (aquocyanophthalocyaninatocobalt (III)) forms semiconducting nanocrystals that can be dispersed in epoxy coatings to obtain a semiconducting material with a low percolation threshold. We investigated the structure-conductivity relation in this composite and the deviation from its optimal realization by combining two techniques. The...

Ab initio study of energy-level alignments in polymer-dye blends

Polymers with a small amount of dye blended in offer an attractive possibility to change the color of the emitted light by changing the dye. We present ab initio calculations within density-functional theory of the HOMO/ LUMO energies for dipyrrolomethane dyes, polyphenylenevinylene and polyfluorene. Special attention is paid to the trends in...