The return of the beloved: The chiasmus and the messianic secret of Abraham Lincoln

Lincoln designed certain of his major speeches with a chiasmus for a model. This stylistic device governs the integration of form and function in Lincoln's presidential rhetoric, and it suggests that more than one level of meaning is operating. The chiasmus reveals that Lincoln saw himself as called by God to fulfill a special messianic mission.     

A fluid dynamic investigation of the Big Blade and Macon oar blade designs in rowing propulsion

Abstract

The purpose of this investigation was to examine the fluid dynamic characteristics of the two most commonly used oar blades: the Big Blade and the Macon. Scaled models of each blade, as well as a flat Big Blade, were tested in a water flume using a quasi-static method similar to that used in swimming and kayaking research. Measurement of the normal and tangential blade forces enabled lift and drag forces generated by the oar blades to be calculated over the full range of sweep angles observed during a rowing stroke. Lift and drag force coefficients were then calculated and compared between blades. The results showed that the Big Blade and Macon oar blades exhibited very similar characteristics. Hydraulic blade efficiency was not therefore found to be the reason for claims that the Big Blade could elicit a 2% improvement in performance over the Macon. The Big Blade was also shown to have similar characteristics to the flat plate when the angle of attack was below 90°, despite significant increases in the lift coefficient when the angle of attack increased above 90°. This result suggests that the Big Blade design may not be completely optimized over the whole stroke.     

Paradigms and Pedagogy: revisiting D’Arcy’s critique of the teaching and the assessment of writing

This paper draws on research funded by the Bedford Charity (Harpur Trust) in which the narrative writing of reluctant writers in 10 Lower Schools (pupils aged 5–9) was levelled using, firstly, the Assessment of Pupil Progress (APP) criteria used in English primary and secondary schools and, secondly, criteria devised by the researcher. The latter were specifically designed for the assessment of narrative writing, whereas the APP criteria are generic. Findings resonate with the contrasting paradigms critiqued in D’Arcy’s paper on the teaching and assessment of writing (D’Arcy 1999). Evidence suggests that levels assigned to individual texts can vary between one assessment criteria and another. In many cases, pupils achieved higher levels against criteria designed to evaluate creativity and the ability to tell a story. Appropriate assessment criteria are critical not only to summative evaluations but also to the planning of future teaching and learning. However, it is suggested that the dominant assessment paradigm and concomitant approaches to the pedagogy of writing in England have been influenced by discourses over which teachers have had little control. However, the future for the teaching and assessment of writing necessitates a paradigmatic shift. A retrospective of D’Arcy’s paper may provide teachers and academics with the impetus for change.     

Teacher Implementation and the Impact of Game-Based Science Curriculum Materials

Research-based digital games hold great potential to be effective tools in supporting next-generation science learning. However, as with all instructional materials, teachers significantly influence their implementation and contribute to their effectiveness. To more fully understand the contributions and challenges of teacher implementation of digital games, we studied the replacement of existing high school biology genetics lessons over a 3- to 6-week period with Geniverse, an immersive, game-like learning environment designed to be used in classrooms. The Geniverse materials infuse virtual experimentation in genetics with a narrative of a quest to heal a genetic disease; incorporate the topics of meiosis and protein synthesis with inheritance; and include the science practices of explanation and argumentation. The research design involved a quasi-experiment with 48 high school teachers and about 2000 students, student science content knowledge and argumentation outcome measures, and analysis using hierarchical linear modeling. Results indicate that when Geniverse was implemented as the designers intended, student learning of genetics content was significantly greater than in the comparison, business-as-usual group. However, a wide range of levels of Geniverse implementation resulted in no significant difference between the groups as a whole. Students’ abilities to engage in scientific explanation and argumentation were greater in the Geniverse group, but these differences were not statistically significant. Observation, survey, and interview data indicate a range of barriers to implementation and teacher instructional decisions that may have influenced student outcomes. Implications for the role of the teacher in the implementation of game-based instructional materials are discussed.     

Crossing disciplinary,institutional and role boundaries in an interdisciplinary consortium

To illuminate barriers to collaboration, this study examines who participates in cross-boundary scholarly collaboration most often and which types of boundary crossing (disciplinary, institutional, role) are engaged in most often. The data of this study came from an interdisciplinary consortium with five partner institutions, including one Historically Black College and University (HBCU). The core disciplines involved in the consortium are life sciences, computer science and math and engineering. Through statistical analysis, we determined that members of the consortium engaged more in interdisciplinary research than inter-institutional research. Participation in all boundary crossing collaborations was greater at the HBCU and students and postdocs were less likely than academics to cross-institutional boundaries.