Prediction and reduction of rotor broadband noise

Prediction techniques which can be or have been applied to subsonic rotors, and methods for designing helicopter rotors for reduced broadband noise generation are summarized. It is shown how detailed physical models of the noise source can be used to identify approaches to noise control

Supporting siblings of children with a special educational need or disability : an evaluation of Sibs Talk, a one‐to‐one intervention delivered by staff in mainstream schools

A group often overlooked for specific supports in schools are siblings of children with a disability, special educational needs or a serious long‐term condition (SEND). In this article we review the current sibling research and identify a lack of literature on interventions, particularly within a school context. We then present a description of Sibs Talk, an example of a new school‐based intervention to support siblings. Sibs Talk is a ten‐session, one‐to‐one intervention approach for schools to complete with Key Stage 2 children who have a brother or sister with SEND. Finally, we present an initial evaluation of the effectiveness of Sibs Talk, using a pre and post evaluation format with a sample of 55 children from 11 schools. The data presented in this evaluation indicate that Sibs Talk may have contributed to positive outcomes for participating children

Legal Research and Writing LRW (Law 513)

This portfolio explores and documents student learning in a required first-year law course, Legal Analysis, Research and Writing. This portfolio focuses on two specific course learning objectives: (1) organizing a legal argument (CRAC or a variation) and (2) explaining legal rules. I evaluated student work on the two writing assignments with the most weight—Research Memo 1 and Research Memo 2 to analyze whether students improved their understanding of and ability to perform the selected learning goals. I was specifically interested in student improvement from Research Memo 1 to Research Memo 2 because they represent a formative and a summative assessment and because students have an opportunity to rewrite Research Memo 1 after receiving written feedback

Toward Truth and Reconciliation: Public Memory, Philosophical Pairs, and the Edmund Pettus Bridge

This thesis connects the rhetoric of Bryan Stevenson which advances truth and reconciliation for racial healing in the United States to a case study of the Edmund Pettus Bridge in Selma, Alabama. I examine common cultural invocations of the bridge that support the persistence of a blurry public memory that occludes visibility of its original memorial dedication to a known white supremacist and instead celebrates it as a landmark of the civil rights movement. I also analyze arguments for both changing and keeping the name of the bridge that occurred between 2015-2020, illustrating ways in which Perelman and Olbrechts-Tyteca’s philosophical pairs manifest through and across these arguments. Instantiating the bridge in duality as both a monument to the confederacy and the civil rights movement, I contemplate what lessons the bridge makes available to a public that desires to engage in conversations that approach the truth-telling and reconciliation Stevenson has advocated

Modeling and Analysis of Power Processing Systems

The feasibility of formulating a methodology for the modeling and analysis of aerospace electrical power processing systems is investigated. It is shown that a digital computer may be used in an interactive mode for the design, modeling, analysis, and comparison of power processing systems

TWO STAGGERED SURFACE-MOUNTED FINITE-HEIGHT CYLINDERS IN A CROSS-FLOW

Two surface-mounted finite-height cylinders in a staggered configuration immersed in a cross-flow can be used to represent a broad variety of engineering applications. The centre-to-centre pitch ratio, P/D, incidence angle, α, and Reynolds number, Re, are known to strongly influence the aerodynamic loading on the cylinders and vortex shedding, however the effects of cylinder aspect ratio, AR (= height/diameter) and the boundary layer thickness on the ground plane, δ/D, are not yet well understood. Most studies of the flow around two surface-mounted finite-height cylinders have focused on two main configurations, tandem (α = 0°) and side-by-side (α = 90°). In the present research, the flow around two finite cylinders in a staggered configuration was systematically studied, to better understand the effects of the cylinder aspect ratio. Wind tunnel experiments were conducted at Re = 6.5×104 with a relative boundary layer thickness of δ/D = 1.4 for cylinders of AR = 9, 7, 5, and 3. The pitch ratio was varied from 1.125 ≤ P/D ≤ 4.5 in 12 discrete steps and the incidence angle was varied from 0° ≤ α ≤ 90° in small increments. Of specific interest were the effects of AR on the mean drag coefficient, CD, mean lift coefficient, CL, and Strouhal number, St, experienced by the upstream and downstream cylinders in each staggered configuration, and any differences between the behaviour of two finite cylinders compared to more extensively studied case of two infinite (two-dimensional) cylinders. The results for the two finite cylinders in tandem showed a relatively smooth transition from the reattachment flow pattern to the co-shedding flow pattern, in contrast to what is seen for two infinite cylinders. A reduced range of P/D was found where the downstream cylinder experienced a thrust force. These changes were attributed to downwash entering the gap between the cylinders and impinging on the downstream cylinder. For the side-by-side configuration, the biased flow pattern continued to be observed for two finite cylinders, but the proximity interference effects were strengthened compared to two infinite cylinders. For closely spaced finite cylinders (P/D ≤ 1.75) near α = 90°, hysteresis was found over a small range of incidence angle where CD and CL could attain different values depending on whether α was incremented positive or negative. At the upper and lower ends of this range of incidence angle, a sudden change in the wake state and the values of CD and CL occurred. Many aspects of the hysteresis were found to be complex functions of AR and P/D. For the staggered configuration, the behaviours of CD, CL, and St were found to be complex functions of P/D, α, and AR. In many cases, but not all, the general effect of reducing aspect ratio was to weaken the wake and proximity interference effects. The data for the two cylinders of AR = 3 behaved distinctly from those of AR = 9, 7, and 5, which showed that these cylinders were less than the critical aspect ratio