Estimation of tunnel blockage from wall pressure signatures: A review and data correlation

A method is described for estimating low speed wind tunnel blockage, including model volume, bubble separation and viscous wake effects. A tunnel-centerline, source/sink distribution is derived from measured wall pressure signatures using fast algorithms to solve the inverse problem in three dimensions. Blockage may then be computed throughout the test volume. Correlations using scaled models or tests in two tunnels were made in all cases. In many cases model reference area exceeded 10% of the tunnel cross-sectional area. Good correlations were obtained regarding model surface pressures, lift drag and pitching moment. It is shown that blockage-induced velocity variations across the test section are relatively unimportant but axial gradients should be considered when model size is determined

Alien Registration- Hackett, Mary D. (Portland, Cumberland County)

https://digitalmaine.com/alien_docs/24453/thumbnail.jp

Home arts course.

Thesis (Ed.M.)--Boston Universit

Development of an improved toughness hyperpure silica reflective heat shield

High purity three dimensionally woven silica-silica materials were evaluated for use as a tough reflective heat shield for planetary entry probes. A special weave design was selected to minimize light piping effects through the heat shield thickness. Various weave spacings were evaluated for densification efficiency with an 0.7 micron particle size high purity silica. Spectral hemispherical reflectance was measured from 0.2 to 2.5 microns at room temperature. Reflectance increases due to densification and purity of material were measured. Reflectance of 3D hyperpure silica was higher than 3D astroquartz silica for all wavelengths. Mechanical properties were measured in beam flexure and beam shear tests. Results indicated strengths lower than reported for slip cast fused silica. Low strengths were attributed to low densities achieved through vacuum impregnation

Effects of impingement of rocket exhaust gases and solid particles on a spacecraft Interim report, Mar. 18 - Oct. 25, 1966

Impingement damage to spacecraft from rocket exhaust gases and micron sized metal particle

Ground simulation and tunnel blockage for a jet-flapped, basic STOL model tested to very high lift coefficients

Ground effects experiments and large/small-tunnel interference studies were carried out on a model with a 20-inch (50.8 cm) span wing. The wing, which includes a highly deflected knee-blown flap can be fitted with unflapped tips and slats. A low-mounted tailplane can be fitted to the aft fuselage. Three-component balance meaurements, made with a fixed ground equipped with a single boundary-layer blowing slot, were compared with datum, moving-ground results. Good comparisons were obtained up to model blowing momentum coefficients of approximately two, after which the particular floor blowing settings used proved insufficient to prevent floor separation in the vicinity of the model. Skin friction measurements, taken routinely along the floor centerline, proved invaluable during the analysis of results, and their use is recommended as input to determination of floor BLC setting. A careful investigation was made of pitching moments, including tail-on, close-to-ground cases, with favorable results. Drag proved the most sensitive to the change from a moving to the boundary-layer controlled ground

Formation of pre-service teachers for religious education through experiential learning: The retreat leaders training program

This article reports on the formation of pre-service teachers for religious education through an experiential learning program called the Retreat Leaders Training Program (RLTP). First, the article examines the need for formation for pre-service RE teachers, especially as the formation relates to the development of three forms of teacher knowledge: content knowledge, pedagogical content knowledge and experiential content knowledge. Second, the article reviews the literature on the role of experiential learning in professional formation and the contribution live-in retreats may make in this formation. Third, the article presents the Retreat Leaders Training Program as an example of the formative influence of a retreat based on experiential learning. Fourth, feedback from pre-service teachers undertaking the 2011 program is reported. Lastly, the article discusses the outcomes of the RLTP and the significance of the program as a key ingredient in the formation of teacher knowledge for religious education

Student ministry: Youth ‘step up’ to lead and serve

This article is about student leadership and service in Catholic secondary schools. Initially the concept of leadership through service is explored with particular reference to the educational setting. The concept of “student ministry” is then considered in the light of this leadership and service. The article subsequently reports on an exploratory research study that focused on the experiences and reflections of principals and selected staff from three Catholic secondary schools involved in student ministry. Their experiences and reflections indicate that student ministry has the capacity to offer all students the chance to develop their leadership potential through acts of service, and accentuate their civic, spiritual, religious and personal formation

Student Ministry: Preparing Young People as Leaders for the 21st Century

Ministry with young people has never been more important. Ever-increasing local, national and global concerns demand that schools must do more than prepare young people as responsible citizens. They must prepare young people as emerging leaders with a civic conscience who proactively seek solutions to issues such as increased poverty, the plight of refugees, terrorism, climate change, and corporate greed. This article is about student ministry. Student ministry, as defined in this article, specifically aims to build leadership capacity in school students. In particular, the article attempts to highlight the distinctiveness of student ministry and those ways it promotes and develops the innate leadership potential of all students. Three other forms of ministry to young people, pastoral ministry, youth ministry and campus ministry, are initially described by way of contrast. An understanding of student ministry follows this description. The need for student ministry in Catholic schools is then explored. The article concludes with a brief outline of the authors pilot study, the findings of which will be presented at the conference

Christian service learning in Catholic schools

This article sets out a rationale for implementing Christian service-learning in Catholic schools. The article initially explores Jesus\u27 Gospel call to serve. A brief summary of Catholic social doctrine is then presented and the concept of service-learning is discussed. Four categories of community outreach by Catholic schools are outline, these being community service, Christian service, service-learning within a Christian context, and faith-focused Christian service-learning. Finally, various implications for promoting Christian service-learning in Catholic schools are considered in the light of the principles of charity and service as outlined in the encyclical letter Deus Caritas Est