In this paper we discuss our experience with the design of a system for supporting learning about other cultures in children attending kindergartens. In the paper we report the motivations behind our work, the requirements that we have identified, and briefly sketch the demonstrators that we have developed.

The power spectrum of mass density uctuations is estimated from the Mark III and the SFI catalogs of peculiar velocities by applying a maximum likelihood analysis, using parametric models for the power spectrum and for the errors. Generalized CDM models with and without COBE normalization are used. The applications to the two diierent data sets give consistent results. The general result is a r...

We use numerical simulations of ray tracing through N-body simulations to investigate weak lensing by large-scale structure. Here we focus on the reconstruction of statistics of the convergence eld from noisy data on galaxy ellipticities. On degree scales and smaller the shear and convergence statistics lie in the nonlinear regime and have a non-gaussian distribution. For this regime ray tracin...

*This is a revised version of a ~a~er prepared for presentation at tP,E; August 1975 meeting of the American Sociological Association, San Francisco. During the preparation of this paper the authors were supported by a National Institute of General Medical Sciences' Training Program in Methodology and Statistics (5-T01-GMOI526-09). The research reported here was supported in part by funds grant...

A spate of recent reports on President Clinton’s 1996 welfare reform initiative, the Personal Responsibility and Work Opportunity Reconciliation Act (“PRA”), indicates that the new welfare regime appears to be working. Although results vary by state, welfare rolls have dropped dramatically as many former recipients have gone to work. It remains to be seen whether the welfare population is bette...