An evaluation of the interfacial bond properties between carbon phenolic and glass phenolic composites

The effects of moisture and surface finish on the mechanical and physical properties of the interfacial bond between the carbon/phenolic (C/P) and glass/phenolic (G/P) composite materials are presented. Four flat panel laminates were fabricated using the C/P and G/P materials. Of the four laminates, one panel was fabricated in which the C/P and G/P materials were cured simultaneously. It was identified as the cocure. The remaining laminates were processed with an initial simultaneous cure of the three C/P billets. Two surface finishes, one on each half, were applied to the top surface. Prior to the application and cure of the G/P material to the machined surface of the three C/P panels, each was subjected to the specific environmental conditioning. Types of conditioning included: (1) nominal fabrication environment, (2) a prescribed drying cycle, and (3) a total immersion in water at 160 F. Physical property tests were performed on specimens removed from the C/P materials of each laminate for determination of the specific gravity, residual volatiles and and resin content. Comparisons of results with shuttle solid rocket motor (SRM) nozzle material specifications verified that the materials used in fabricating the laminates met acceptance criteria and were representative of SRM nozzle materials. Mechanical property tests were performed at room temperature on specimens removed from the G/P, the C/P and the interface between the two materials for each laminate. The double-notched shear strength test was used to determine the ultimate interlaminar shear strength. Results indicate no appreciable difference in the C/P material of the four laminates with the exception of the cocure laminate, where 20 percent reduction in the strength was observed. The most significant effect and the ultimate strength was significantly reduced in the wet material. No appreciable variation was noted between the surface finishes in the wet laminate

Progress in compilation of the 1:2,000,000-scale topographic map

The application of special photogrammetric techniques has enabled the systematic mapping of Mars' topography at a scale of 1:2,000,000, using high-altitude Viking Orbiter pictures. In fiscal 86, compilation was completed of the 24 subquadrangles that make up the quadrangles MC-12, MC-13, MC-14, MC-15, MC-20, and MC-21. This work completes compilation of the 60 topographic maps covering the equatorial belt (lat. + or - 30 deg). The remaining 80 subquadrangles of Mars are planned to be completed within 3 years (27, 27 and 26 subquadrangles, in fiscal 87, 88, and 89, respectively). Elevations on all topographic maps are relative to the Mars topographic datum. The maps have a contour interval of 1 km and a precision of + or - 1 km. The equatorial-belt maps are Mercator projections having true scale at lat. + or - 27.476 deg. These maps provide more precise information than do those previously available and they will help in understanding the geologic processes that have shaped the Martian surface

Passion & IT Governance

15 page(s

Top Management Support: Mantra or Necessity?

This research provides evidence that top management support is the most important critical success factor for project success and is not simply one of many factors. The finding is justified in the context of the project management literature and the IS factor research on project success. There are implications for practice because it appears that the conventional technical and project management advice has less impact on project success than previously thought. Boards and top managers may have to personally accept that they have more influence on whether a project succeeds or fails.13 page(s

Issue Brief: Immigrant Status And Voting Behavior

The United States currently has the highest proportion of immigrants that it has had since the 1920s. These immigrants represent a powerful voting block with behavior that differs in important respects from that of their native-born counterparts

Reading Fiction Predicts People's Empathy

Reading fiction, in and of itself, predicts people’s empathy. People who read fiction tend to feel that they have more social support than those who read non- fiction.York's Knowledge Mobilization Unit provides services and funding for faculty, graduate students, and community organizations seeking to maximize the impact of academic research and expertise on public policy, social programming, and professional practice. It is supported by SSHRC and CIHR grants, and by the Office of the Vice-President Research & Innovation. [email protected] www.researchimpact.c

HOW DOES LEARNING ANTI-RACIST EDUCATION THROUGH CRITICAL PROFESSIONAL DEVELOPMENT AND ARTS-BASED INQUIRY CONTRIBUTE TO TEACHERS’ UNDERSTANDINGS OF THEIR CLASSROOM PRACTICE?

Racism is a significant problem within education. The education system has established institutional hierarchies and perpetuated different forms of racism that restrict the learning experiences of diverse students across Canada. One of the ways that teachers address and disrupt racism is through engaging in critical anti-racist professional development. This study gave teachers the chance to engage in critical anti-racist professional development where they learned about race, racism, and anti-racist education while exploring how their positionalities affect classroom practices. This study used a qualitative arts-based methodology called a/r/tography to create a space where teachers could have deep exploration and understanding of themselves and others by re-imagining lived experiences in and through time through the use of visual art. Combining a/r/tography and anti-racist education together it gave teachers the opportunity to develop awareness of their positionalities, become more critically conscious of their own racialized lenses, and understand how these lenses impact their classroom practices. Through critical artistic reflection on their practice in conjunction with learning anti-racist education strategies, teachers learned to reflect on their practices so as to become more aware of how to disrupt racism and white supremacy within their classrooms

Aria Deployment Model

A deployment model has been designed to determine the flight plans for Apollo Range Instrumentation Aircraft (ARIA) in support of the translunar injection phase of Apollo missions. The major objective of developing this model was to envision the operational factors necessary to meet the ARIA support requirements under various conditions. A discussion of the model would be incomplete without a brief description of the ARIA, its mission, and the translunar injection parameters associated with Apollo missions. There are eight Apollo Range Instrumentation Aircraft in various stages of completion whose mission will be to support NASA/ Apollo and advanced Department of Defense missions. The aircraft are converted C-135s with UHF and S-band telemetry and other communication equipment. They will act as relay stations between the spacecraft and ground stationso In Apollo/Saturn V lunar missions, the ARIA will be deployed to obtain data during the translunar injection and the reentry. The term Injection will designate the event of changing from an earth parking orbit to a translunar trajectory. In the earth parking orbit, the spacecraft will use the S-IVB stage to transfer it from the parking orbit to the translunar trajectory. The data interval ARIA must support is three minutes prior to S-IVB reignition, the S-IVB burn period which is approximately six minutes, and one minute after S-IVB engine cutof

Understanding Coastal Carbon Cycling by Linking Top- Down and Bottom-Up Approaches

The coastal zone, despite occupying a small fraction of the Earth\u27s surface area, is an important component of the global carbon (C) cycle. Coastal wetlands, including mangrove forests, tidal marshes, and seagrass meadows, compose a domain of large reservoirs of biomass and soil C [Fourqurean et al., 2012; Donato et al., 2011; Pendleton et al., 2012; Regnier et al., 2013; Bauer et al.,2013]. These wetlands and their associated C reservoirs (2 to 25 petagrams C; best estimate of 7 petagrams C [Pendleton et al., 2012]) provide numerous ecosystem services and serve as key links between land and ocean