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With seismic interferometry one can retrieve the response to a virtual source inside an unknown medium, assuming there is a receiver at the position of the virtual source. In a companion paper, Broggini et al. show that for the 1D situation the requirement of having an actual receiver inside the medium can be circumvented. They show that the virtual source response can be obtained from reflecti...

The paper explores migrant workers careers in the health sector, comparing the Spanish case and the British case. International migration has become an important feature of globalized labour markets in health care. Recently, concerns over the need of ensuring staff and skill shortages in the health system are becoming a common issue in many European countries. Following this, the paper is focus...

Economists have argued that welfare migration leads to a race to the bottom in the choice of welfare benefits. Although a system of federal matching grants can remedy this problem, the recent welfare reform law replaced the existing matching-grant structure with block grants, a policy change that appears undesirable. To judge whether this critique of welfare reform is justified, this paper eval...

Ricklefs and Renner (Reports, 27 January 2012, p. 464) have argued that the neutral theory of biodiversity and biogeography cannot explain the correlations in family abundances and species richness found between tropical forests from distinct continents. However, we show that such patterns can arise from neutral processes of diversification, migration, and drift over large spatial and temporal ...

The establishment of the Migration Studies Unit can be understood as part of a process of rapid growth of migration studies – which is happening not just in Britain but also throughout Europe and indeed the rest of the world. Compared with the situation twenty or even ten years ago, migration studies has come of age. There are degree courses, specialised journals, conferences and a European net...

This paper analyzes the rural-urban migration of families in the Bohemian region of Pilsen in 1890–1900. Using a new 2000-family dataset from the 1900 population census I examine the human capital investment aspect of rural-urban migration. I find that families migrated to the city such that the educational attainment of their children would be maximized and adolescent children are systematical...

An abstract should be given e use the model for the migration of planets introduced in Del Popolo, Yesilyurt & Ercan (2003) to calculate the observed mass and semimajor axis distribution of extra-solar planets. The assumption that the surface density in planetesimals is proportional to that of gas is relaxed, and in order to describe disc evolution we use a method which, using a series of simpl...

We study the determinants of East–West migration within Germany during the period 1990–2006, using administrative data, the German Microcensus and the German Socio-Economic Panel. We find that in addition to income prospects and employment status, two well-known determinants of migration, psychological and social factors play an important role in determining the migration decision. Men and wome...