Why can an environmental policy tax promote growth through the channel of education?

This paper examines the implications of an environmental policy for growth performances. We develop a model where growth is driven by human capital accumulation. Firms invest in research to develop new technologies to reduce their pollution emissions and education is treated as product which not only enhances the productivity of individuals but also enters in their preferences. We find that a tighter environmental policy can promote growth. The reason is that a higher tax on pollution drives the prices of goods whose production is polluting up. This, in turn, enhances the willingness of individuals to acquire education.

A Onelab model for the parametric study of mono-dimensional diffraction gratings

This document aims at presenting both theoretical and practical aspects of the grating_2D Onelab model (available at http://onelab.info/wiki/Diffraction_grating). This model applies to so-called mono-dimensional grating, i.e. structures having one direction of invariance. Various geometries and materials can be handled or easily added. The two classical polarization cases, denoted here E// and H//, are addressed. The output consists in a full energy balance of the problem computed from the field maps. This model is based on free the GNU softwares Gmsh, GetDP and their interface Onelab.Comment: arXiv admin note: text overlap with arXiv:1302.103

On frequency and time domain models of traveling wave tubes

We discuss the envelope modulation assumption of frequency-domain models of traveling wave tubes (TWTs) and test its consistency with the Maxwell equations. We compare the predictions of usual frequency-domain models with those of a new time domain model of the TWT

Electromagnetic power and momentum in N-body hamiltonian approach to wave-particle dynamics in a periodic structure

To model momentum exchange in nonlinear wave-particle interaction, as in amplification devices like traveling-wave tubes, we use an $N$-body self-consistent hamiltonian description based on Kuznetsov's discrete model, and we provide new formulations for the electromagnetic power and the conserved momentum. This approach leads to fast and accurate numerical simulations in time domain and in one dimensional space