9,605 research outputs found
Family Structure and the Economic Wellbeing of Children
An extensive literature that examines the relationship between family structure and children's outcomes consistently shows that living with a single parent is associated with negative outcomes. Few studies, however, directly test the relationship between family structure and outcomes for the child once he/she reaches adulthood. We directly examine, using the Panel Study of Income Dynamics, whether family structure during childhood is related to the child's economic wellbeing both during childhood as well as adulthood. Our findings suggest that the economic wellbeing of children of mothers who experience a marital dissolution and remarry are no different from the children of mothers who are continuously married. However, the children of mothers whose marriages dissolve but who do not remarry experience large declines in their income over their first ten years of life. We also show that while the children of never married mothers earn a lot less as adults than the children of married parents, these differences can largely be explained by demographic and socioeconomic factors. Finally, our findings suggest that children who have mothers who experience a marital dissolution and who do not remarry have economic losses that persist into adulthood. Robustness checks using family fixed effects models support this result
Family Structure and the Economic Mobility of Children
Compares the economic mobility, both absolute and relative, of children of continuously married mothers, divorced mothers, and unmarried mothers by race and family income level. Explores the role of racial differences in family structure and implications
Incompressible immiscible multiphase flows in porous media: a variational approach
We describe the competitive motion of (N + 1) incompressible immiscible
phases within a porous medium as the gradient flow of a singular energy in the
space of non-negative measures with prescribed mass endowed with some tensorial
Wasserstein distance. We show the convergence of the approximation obtained by
a minimization schem\`e a la [R. Jordan, D. Kinder-lehrer \& F. Otto, SIAM J.
Math. Anal, 29(1):1--17, 1998]. This allow to obtain a new existence result for
a physically well-established system of PDEs consisting in the Darcy-Muskat law
for each phase, N capillary pressure relations, and a constraint on the volume
occupied by the fluid. Our study does not require the introduction of any
global or complementary pressure
Warp-speed adaptation to novel hosts after 300 generations of enforced dietary specialisation in the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae)
Thank you to Paul Eady for providing C. maculatus to initiate our laboratory population and advice on rearing them. The study was funded by the University of Aberdeen core teaching funds (honours project budget to TP), and by a doctoral training grant to AL from the BBSRC-EastBio doctoral training partnershipPeer reviewedPublisher PD
Cross-middleware Interoperability in Distributed Concurrent Engineering
Secure, distributed collaboration between different organizations is a key challenge in Grid computing today. The GDCD project has produced a Grid-based demonstrator Virtual Collaborative Facility (VCF) for the European Space Agency. The purpose of this work is to show the potential of Grid technology to support fully distributed concurrent design, while addressing practical considerations including network security, interoperability, and integration of legacy applications. The VCF allows domain engineers to use the concurrent design methodology in a distributed fashion to perform studies for future space missions. To demonstrate the interoperability and integration capabilities of Grid computing in concurrent design, we developed prototype VCF components based on ESAâs current Excel-based Concurrent Design Facility (a non-distributed environment), using a STEP-compliant database that stores design parameters. The database was exposed as a secure GRIA 5.1 Grid service, whilst a .NET/WSE3.0-based library was developed to enable secure communication between the Excel client and STEP database
Probing the Geometry of Supernovae with Spectropolarimetry
We present results from a spectropolarimetric survey of young supernovae
completed at the Keck Observatory, including at least one example from each of
the major supernova types: Ia (1997dt), Ib (1998T, 1997dq), Ib/c-pec (1997ef),
IIn (1997eg), and II-P (1997ds). All objects show evidence for intrinsic
polarization, suggesting that asphericity may be a common feature in young
supernova atmospheres.Comment: 4 pages, 2 figures. To appear in the Proceedings of the 10th Annual
October Astrophysics Conference in Maryland: Cosmic Explosion
A stochastic model for wound healing
We present a discrete stochastic model which represents many of the salient
features of the biological process of wound healing. The model describes fronts
of cells invading a wound. We have numerical results in one and two dimensions.
In one dimension we can give analytic results for the front speed as a power
series expansion in a parameter, p, that gives the relative size of
proliferation and diffusion processes for the invading cells. In two dimensions
the model becomes the Eden model for p near 1. In both one and two dimensions
for small p, front propagation for this model should approach that of the
Fisher-Kolmogorov equation. However, as in other cases, this discrete model
approaches Fisher-Kolmogorov behavior slowly.Comment: 16 pages, 7 figure
Medicaid Expansions and Fertility in the United States
Beginning in the mid 1980s and extending through the early to mid 1990s, a substantial number of women and children gained eligibility for Medicaid through a series of income-based expansions. Using natality data from the National Center for Health Statistics, we estimate fertility responses to these eligibility expansions. We measure changes in state Medicaid eligibility policy by simulating the fraction of a standard population that would qualify for benefits. From 1985 to 1996, the fraction of women aged 15 to 44 who were eligible for Medicaid coverage for a pregnancy increased on average by 24 percentage points. However, contrary to findings in the extant literature, our results do not indicate that this expansion in coverage had a statistically discernible effect on fertility.
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