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Design and Implementation of the Finite Element Software ForcePAD

ForcePAD is an intuitive tool for visualising the behavior of structures subjected to loading and boundary conditions. The design of the user interface aims to be as intuitive as a standard image processing software. Users should be able to design structures, apply and boundary conditions and visualise results without knowledge of the underlying nite element model.

Fingerprints of spatial charge transfer in Quantum Cascade Lasers

We show that mid-infrared transmission spectroscopy of a quantum cascade laser provides clear-cut information on changes in charge location at different bias. Theoretical simulations of the evolution of the gain/absorption spectrum for a lambda~7.4 µm InGaAs/AlInAs/InP quantum cascade laser have been compared with the experimental findings. Transfer of electrons between the ground states in the ac

Piece-rates and prosperity: evidence from the late nineteenth-century tobacco industry

This paper uses a new and detailed survey of cigar making employers and employees to investigate two related discrimination issues. First, were piece rate cigar makers – the skilled aristocracy of this industry – paid differently by gender? We find that they were, but that the differences can be more than explained by differences in characteristics such as age and experience. Second, we ask whethe