Crowding the Curriculum? Changes to Grades 9 and 10 Science in British Columbia, 1920-2014

In recent years, educators and academics across North America have argued that science curricula have become increasingly crowded, rendering it almost impossible for teachers to address the multitude of learning outcomes mandated in any given document (e.g., Fortner, 2001; Hacker, 1997). Unfortunately, an analysis of the research literature has failed to substantiate this claim with empirical evidence. This study investigated the claim of crowding in the Science 9 and 10 curricula of one jurisdiction: British Columbia (BC). A content analysis of the Grades 9 and 10 science curricula issued by BC’s government between 1920 to 2014 revealed curricular change characterized by the expansion and reconfiguration of content, persistent attempts to respond to social and educational needs, and constant oscillations between student-centred and subject-centred teaching approaches. This study also illustrates that the potential crowding of the science curriculum suggested by a pattern of constant curricular expansion has as much to do with changing educational theories and ideologies as with scientific developments

Intermultiplet transitions and magnetic long-range order in Sm-based pyrochlores

We present bulk and neutron scattering measurements performed on the isotopically enriched $^{154}\mathrm{Sm_2Ti_2O_7}$ and $^{154}\mathrm{Sm_2Sn_2O_7}$ samples. Both compounds display sharp heat capacity anomalies, at 350 mK and 440 mK, respectively. Inelastic neutron scattering measurements are employed to determine the crystalline electric field (CEF) level scheme, which includes transitions between the ground-state and first excited $J$ multiplets of the $\mathrm{Sm}^{3+}$ ion. To further validate those results, the single-ion magnetic susceptibility of the compounds is calculated and compared with the experimental DC-susceptibility measured in low applied magnetic fields. It is demonstrated that the inclusion of intermultiplet transitions in the CEF analysis is fundamental to the understanding of the intermediate and, more importantly, low temperature magnetic behaviour of the Sm-based pyrochlores. Finally, the heat capacity anomaly is shown to correspond to the onset of an all-in-all-out long-range order in the stannate sample, while in the titanate a dipolar long-range order can be only indirectly inferred.Comment: 13 pages, 10 Figure

Knotted and Linked Products of recombination on T(2,n)#T(2,m) Substrates

We develop a topological model of site-specific recombination that applies to substrates which are the connected sum of two torus links of the form T(2,n)#T(2,m). Then we use our model to prove that all knots and links that can be produced by site-specific recombination on such substrates are contained in one of two families, which we illustrate

Children at Risk in the Child Welfare System: Collaborations to Promote School Readiness - Final Report

This study examines the degree to which key players in the child welfare, early intervention/preschool special education (EI/Preschool SPED) and early care and education (ECE) systems (e.g. Head Start, preschool, child care centers, family child care homes) collaborate to meet the developmental needs of children ages 0 to 5 who are involved in the child welfare system. This research includes an analysis of data from the National Survey of Child and Adolescent Wellbeing (NSCAW) as well as a case study in Colorado involving interviews with key stakeholders and statewide surveys of caseworkers and foster parents