Differences in Delaying Motherhood Across European Countries: Empirical Evidence from the ECHP

Motherhood postponement and fertility decline have been observed in almost all developed countries. In this article, we aim to assess some of the potential determinants of first childbirth timing in Europe, in a comparative perspective, using data from the European Community Household Panel Survey (ECHP). We estimate, separately by country, hazard rates for the timing at first childbirth conditioning to education and work characteristics. Moreover, in order to explain differences between European countries, we decompose the differences between rates in the part due to the national population composition by specific characteristics and the part due to different propensities for women with given characteristics.     

The Extended Metropolitan Area in a New EU Member State: Implications for a Rural Development Approach

I examine the role of rural development strategies in a new member state (Romania) of the European Union and, in particular, analyse the case of the metropolitan area of the Bucharest-Ilfov region. The analysis concerns the selected strategies for rural development in the programming period 2007–2013. It must be noted that Romania is divided into nonadministrative development regions and that the process of land privatisation is not yet concluded. These factors could have a negative influence on the implementation of the interventions. The analysed region is situated in the Southern part of the country and in the central part of the Romanian Plan. The total surface is about 1.8 square kilometres, of which 12.5% are occupied by the town of Bucharest and 87.5% by Ilfov County; however, approximately 88% of the population is concentrated in the urban center and only 12% in Ilfov County. The case study is characterised on the one hand by a high growth rate of the gross domestic product, a relatively low unemployment rate, and increasing consumer good sales (mainly food and beverages); on the other, by some marked disparities in macroeconomic indicators among regions and between rural and urban areas and an enormous lack of infrastructures. The case study thus calls for a local approach in order to identify the strategies required to improve the quality of life of the regional inhabitants (both in rural and urban areas) and to prevent pressure from the urban centre from compromising the rich rural heritage      

Case study for evaluating campus sustainability: nitrogen balance for the University of Minnesota

American ecologists recently began to address the ecology of cities. Concurrently, higher education institutions have developed sustainability education programs and instituted sustainability policies and projects. This paper draws together these two disparate areas by examining the nitrogen (N) budget of the Twin Cities campus of the University of Minnesota. We addressed the question: what were the annual inputs, outputs and internal cycles of N on the University of Minnesota Twin Cities campus? We found that 508 Mg N yr-1 were brought into the campus and 494 Mg N yr-1 were emitted from the University of Minnesota campus. The largest N inputs were abiotic fixation (conversion of N₂ to NO_x by combustion) and food for humans and animals. The largest N output was NO_x, followed by wastewater. Our results expand the understanding of the ecology of institutions within an urban area and provide an opportunity for improving urban ecology education and environmental policy at educational institutions.     

Separator-based data reduction for signed graph balancing

Polynomial-time data reduction is a classical approach to hard graph problems. Typically, particular small subgraphs are replaced by smaller gadgets. We generalize this approach to handle any small subgraph that has a small separator connecting it to the rest of the graph. The problem we study is the NP-hard Balanced Subgraph problem, which asks for a 2-coloring of a graph that minimizes the inconsistencies with given edge labels. It has applications in social networks, systems biology, and integrated circuit design. The data reduction scheme unifies and generalizes a number of previously known data reductions, and can be applied to a large number of graph problems where a coloring or a subset of the vertices is sought. To solve the instances that remain after reduction, we use a fixed-parameter algorithm based on iterative compression with a very effective heuristic speedup. Our implementation can solve biological real-world instances exactly for which previously only approximations were known. In addition, we present experimental results for financial networks and random networks.     

Contexte local et migration: l’exemple des dynamiques migratoires internationales de quartiers dans la ville sénégalaise de Kaolack

Despite the diversity of the variables considered, explanatory models of migration do not fully incorporate the locality of origin as a scale of observation for migratory behaviour. Migration is often perceived to generate notions of territory; conversely, are local territories drivers of mobility? If so, in what forms, and by what means? This article analyses international migration from the city of Kaolack in Senegal, with particular focus on the role of the neighbourhood in migration dynamics. Here, the neighbourhood is seen as relatively homogeneous and singular historical and social entity. The ties that are established and maintained from one generation to the next take the form of shared lifestyles and modes of organization which may influence inhabitants’ propensity to emigrate.     

Pooling designs associated with unitary space and ratio efficiency comparison

Let \mathbbF^(2n+d)_q²\mathbb{F}^{(2\nu+\delta)}_{q^{2}} be a (2ν+δ)-dimensional unitary space of \mathbbF_q²\mathbb{F}_{q^{2}} , where δ=0 or 1. In this paper we construct a family of inclusion matrices associated with subspaces of \mathbbF^(2n+d)_q²\mathbb{F}^{(2\nu+\delta)}_{q^{2}} , and exhibit its disjunct property. Moreover, we compare the ratio efficiency of this construction with others, and find it smaller under some conditions.     

Grandchild Care Transfers by Ageing Immigrants in France: Intra-household Allocation and Labour Market Implications

Using a unique sample on ageing first generation immigrants in France, we explore the distribution of grandchild care across offspring and the impact of this transfer on the labour supply of the mother. Our results indicate that grandchild care is spread unequally across siblings, and this inequality is driven more strongly by better labour market potential than by weaker financial status of the recipient. There is further evidence that even after accounting for potential endogeneity and unobserved heterogeneity, grandchild care has a positive impact on the labour supply of the mother. The pattern of intergenerational time transfers differs across people with different national and religions backgrounds.     

Race–gender Differences in Risk and Protective Factors among Youth in Residential Group Homes

Analysis reported here examined youth in residential group home placements in order to better understand how sexual behaviors, drug use, and environmental experiences differ by race and gender subgroups. Data were collected from 336 youth aged 14–21 residing in one of 41 group homes in Maryland. Chi square and logistic regression analyses were done to determine differences on study variables among the race-gender groupings. Results demonstrate not only significant health concerns overall but notable differences were also found between race-gender subgroups. Findings suggest that found race-gender subgroup differences might be informative for tailoring programming for youth of residential group home settings.