2,672 research outputs found
Neighbourhood mobility in context : household moves and changing neighbourhoods in the Netherlands
Although high levels of population mobility are often viewed as a problem at the neighbourhood level we know relatively little about what makes some neighbourhoods more mobile than others. The main question in this paper is to what extent differences in out-mobility between neighbourhoods can be explained by differences in the share of mobile residents, or whether other neighbourhood characteristics also play a role. To answer this question we focus on the effects of the socioeconomic status and ethnic composition of neighbourhoods and on neighbourhood change. Using data from the Netherlands population registration system and the Housing Demand Survey we model population mobility both at individual and at neighbourhood levels. The aggregate results show that the composition of the housing stock and of the neighbourhood population explain most of the variation in levels of neighbourhood out-mobility. At the same time, although ethnic minority groups in the Netherlands are shown to be relatively immobile, neighbourhoods with higher concentrations of ethnic minority residents have the highest population turnovers. The individual-level models show that people living in neighbourhoods which experience an increase in the percentage of ethnic minorities are more likely to move, except when they belong to an ethnic minority group themselves. The evidence suggests that 'white flight' and 'socio-economic flight' are important factors in neighbourhood change.PostprintPeer reviewe
Uniqueness for the electrostatic inverse boundary value problem with piecewise constant anisotropic conductivities
We discuss the inverse problem of determining the, possibly anisotropic,
conductivity of a body when the so-called
Neumann-to-Dirichlet map is locally given on a non empty curved portion
of the boundary . We prove that anisotropic
conductivities that are \textit{a-priori} known to be piecewise constant
matrices on a given partition of with curved interfaces can be
uniquely determined in the interior from the knowledge of the local
Neumann-to-Dirichlet map
Lipschitz stability of an inverse boundary value problem for a Schr\"{o}dinger type equation
In this paper we study the inverse boundary value problem of determining the
potential in the Schr\"{o}dinger equation from the knowledge of the
Dirichlet-to-Neumann map, which is commonly accepted as an ill-posed problem in
the sense that, under general settings, the optimal stability estimate is of
logarithmic type. In this work, a Lipschitz type stability is established
assuming a priori that the potential is piecewise constant with a bounded known
number of unknown values
Reconstruction of Lame moduli and density at the boundary enabling directional elastic wavefield decomposition
We consider the inverse boundary value problem for the system of equations
describing elastic waves in isotropic media on a bounded domain in
via a finite-time Laplace transform. The data is the dynamical
Dirichlet-to-Neumann map. More precisely, using the full symbol of the
transformed Dirichlet-to-Neumann map viewed as a semiclassical
pseudodifferential operator, we give an explicit reconstruction of both
Lam\'{e} parameters and the density, as well as their derivatives, at the
boundary. We also show how this boundary reconstruction leads to a
decomposition of incoming and outgoing waves
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