Problems and Potential for Canadian Child Welfare

Canadian child welfare is not one single system, but more than 13 systems overseen by provincial and territorial governments and First Nations jurisdictions. However, there are many similarities among systems and general trends and directions common to them. One of these is a tendency for child welfare to become isolated from communities and related services because of its increasingly complex legislation and investigative mandates (Swift, 2001). Another is the challenge of serving peoples of diverse cultural and racial backgrounds, including First Nations peoples. Of course, each jurisdiction also responds to its particular social and political context in unique ways. In this paper we will present an overall picture of child welfare policies, services and trends across the country. We will also examine some unique and specific examples of ways child welfare organizations respond to local needs through the development of various kinds of partnerships. Highlighted in this paper will be some partnership developments with First Nations people and with diverse racial and cultural communities. Also highlighted are existing and potential partnerships with relevant service and advocacy organizations. We conclude with comments on implications of these partnerships for Canadian child welfare generally

A Lattice Boltzmann Model of Binary Fluid Mixture

We introduce a lattice Boltzmann for simulating an immiscible binary fluid mixture. Our collision rules are derived from a macroscopic thermodynamic description of the fluid in a way motivated by the Cahn-Hilliard approach to non-equilibrium dynamics. This ensures that a thermodynamically consistent state is reached in equilibrium. The non-equilibrium dynamics is investigated numerically and found to agree with simple analytic predictions in both the one-phase and the two-phase region of the phase diagram.Comment: 12 pages + 4 eps figure

Scaling forces to asteroid surfaces: The role of cohesion

The scaling of physical forces to the extremely low ambient gravitational acceleration regimes found on the surfaces of small asteroids is performed. Resulting from this, it is found that van der Waals cohesive forces between regolith grains on asteroid surfaces should be a dominant force and compete with particle weights and be greater, in general, than electrostatic and solar radiation pressure forces. Based on this scaling, we interpret previous experiments performed on cohesive powders in the terrestrial environment as being relevant for the understanding of processes on asteroid surfaces. The implications of these terrestrial experiments for interpreting observations of asteroid surfaces and macro-porosity are considered, and yield interpretations that differ from previously assumed processes for these environments. Based on this understanding, we propose a new model for the end state of small, rapidly rotating asteroids which allows them to be comprised of relatively fine regolith grains held together by van der Waals cohesive forces.Comment: 54 pages, 7 figure