President Fainstein\u27s 88th Commencement Address

President Fainstein advises graduates: I do not insist that you all see four decades of history my way or draw the same lessons as I do. But, please, don’t wait for things to fall apart before you take a hard look at the world and act to make it a better place — better according to each of your lights, better according to the values each of you holds dear

Structural Changes in Estonian Manufacturing and Regional Development.

In the transition to a market economy the countries of Eastern Europe underwent a significant structural changes. There is a plenty of literature on the structural changes in industry in transition countries. Some works on industrial restructuring have appeared in Estonia as well. By now the time series of data on this field are long enough to conduct this kind of analysis in a more systematic and formal way. The aim of this work is an analysis of the structural changes in the Estonian manufacturing in transition and it relation with regional development. The changes in manufacturing output structure is analyzed by the NACE classification broad sectors. Changes in values and real output are considered. The development of relative prices, industrial employment and labor productivity are also examined. A set of indices are calculated to study regional manufacturing dynamics. After that econometric analysis of relation between industrial restructuring and the regional development is considered. The paper ends with the conclusions.

The impact of trade liberalisation on adjustment of regional wages in Estonia

The purpose of this paper is twofold. First, we aim at analysing the development of regional specialisation in Estonia since the beginning of trade liberalisation and integration into the EU in the early 1990s. Second, given the patterns of developments in specialisation, we analyse how trade liberalisation has affected structure of regional wages. The main data used in this study consist of a panel of 5 geographic regions aggregated at the NUTS3 level by the EU classification. For every region we calculated indices of regional industrial specialisation in 1990-2002. The indices are based on data for employment in manufacturing industries classified by two-digit NACE standard (total of 13 industries). The impact of integration with EU on regional development is based on the data for average wages in industry in regions at NUTS IV level (15 administrative units of Estonia). The analysis of industrial specialisation in Estonian NUTS III regions showed that the level of specialisation has increased on average by 1-1.5% a year. As for transition economy time is a fair proxy to integration, we may conclude that initial stages of establishing closer economic relations with EU and voluminous target investments into the regions stimulated specialisation. Econometric analysis of relationship between relative regional wages and distance to the capital suggests an explanation consistent with new economic geography hypothesis. Surprisingly, in spite of small size of Estonian territory, distance have essensial effect on variations in regional wages. Our estimates show that integration with EU and trade liberalisation minimises negative impact of distance.

Polariton-mediated Raman scattering in microcavities: A Green's function approach

We present calculations of the intensity of polariton-mediated inelastic light scattering in semiconductor microcavities within a Green's function framework. In addition to reproducing the strong coupling of light and matter, this method also enables the inclusion of damping mechanisms in a consistent way. Our results show excellent agreement with recent Raman scattering experiments.Comment: 6 pages, 1 figur

Multiple Quantum Wells for P T -Symmetric Phononic Crystals

We demonstrate that the parity-time symmetry for sound is realized in laser-pumped multiple-quantum-well structures. Breaking of the parity-time symmetry for the phonons with wave vectors corresponding to the Bragg condition makes the structure a highly selective acoustic wave amplifier. Single-mode distributed feedback phonon lasing is predicted for structures with realistic parameters.Fil: Poshakinskiy, A.V.. Ioffe Institute; RusiaFil: Poddubny, A.N.. Ioffe Institute; RusiaFil: Fainstein, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentin

Dispersion and damping of multi-quantum well polaritons from resonant Brillouin scattering by folded acoustic modes

We report on confined exciton resonances of acoustic and folded acoustic phonon light scattering in a GaAs/AlAs multi-quantum-well. Significant variations of the line shifts and widths are observed across the resonance and quantitatively reproduced in terms of the polariton dispersion. This high resolution Brillouin study brings new unexpectedly detailed informations on the polariton dynamics in confined systems

Cavity polariton optomechanics: Polariton path to fully resonant dispersive coupling in optomechanical resonators

Resonant photoelastic coupling in semiconductor nanostructures opens new perspectives for strongly enhanced light-sound interaction in optomechanical resonators. One potential problem, however, is the reduction of the cavity Q-factor induced by dissipation when the resonance is approached. We show in this letter that cavity-polariton mediation in the light-matter process overcomes this limitation allowing for a strongly enhanced photon-phonon coupling without significant lifetime reduction in the strongly-coupled regime. Huge optomechanical coupling factors in the PetaHz/nm range are envisaged, three orders of magnitude larger than the backaction produced by the mechanical displacement of the cavity mirrors.Comment: 6 pages, 4 figure