The Atmosphere Explorer and the shuttle glow

Recent analyses of the Atmosphere Explorer data are discussed in which it is demonstrated that the satellite glows have two components, one at high altitudes which is consistent with excitation in single collisions of atmospheric oxygen atoms with the vehicle surface and the other at low altitudes which is consistent with double collisions of nitrogen molecules. Contrary to an earlier suggestion, the low-altitude data are not consistent with collisions of oxygen molecules. The separation of the two components strengthens the conclusion that the high-altitude glow arises from vibrationally excited OH molecules produced by a formation mechanism that is different from that leading to the normal atmospheric OH airglow. The spectrum is consistent with association of oxygen and hydrogen atoms at sites on the surface into the vibrational levels of OH. The low-altitude glow is consistent with the green mechanism but there are difficulties with it. The shuttle glows are different and have the spectral appearance of emission from NO2. The characteristics of the shuttle glows and the satellite glows will be contrasted and a tentative resolution of the differences in the Atmosphere Explorer and shuttle glows will be offered

Determination of local material properties of OSB sample by coupling advanced imaging techniques and morphology-based FEM simulation

This is the publisher’s final pdf. The published article is copyrighted by Walter de Gruyter & Co. and can be found at: http://www.degruyter.com/.The goal was to determine local mechanical properties inside of oriented strand board (OSB) based on a realistic morphology-based finite element (FE) model and data acquired from a physical test performed on the same material. The spatial information and local grayscale intensity from CT-scans obtained from small OSB sample was transformed into a 2D regular morphology-based FE mesh with corresponding material properties. The model was then used to simulate the actual compression test performed on the specimen using simplified boundary conditions. The simulated strain fields from the model were compared with the actual strain field measured on the specimen surface during the compression test by means of a full-field optical method, named digital image correlation (DIC). Finally, the original set of material properties was adjusted by an iterative procedure to minimize the difference between the simulated and the measured strain data. The results show that the developed procedure is useful to find local material properties as well as for morphological modeling without the need of segmentation of the image data. The achieved results serve as a prerequisite for full 3D analyses of the complex materials

Saint Nicolas-de-Bourgueuil – Les caves de la Gardière

Date de l'opération : 1984 (SD) Inventeur(s) : Lecompte Jean-Paul ; Boucher M A la suite du déblaiement d'une cave, un grand nombre de fragments de céramique furent récupérés par le propriétaire. En 1984, un relevé stratigraphique fut réalisé dans une petite partie du remblai qui paraît dater du XVe et du XVIe s

Critical Mirrors: Diverse College Students\u27 Perspectives on Stereotypes Depicted in Popular Films About College Life

This qualitative study explored diverse college students’ perspectives on the portrayal of college life in recent popular films. Results from this study suggest that White college students dismiss stereotypes as comedic satire whereas their non-White peers readily identify the influence of negative media representations upon their academic and ethnic identities. These findings exemplify the need to promote positive representations of college students from racially and culturally diverse backgrounds. Findings suggest the need for Critical Media Literacy education to help young adults dismantle stereotypes in mainstream society while developing cultural competence

Engaging in “dangerous discussions”: Fostering cultural competence through the analysis of depictions of college life in popular films.

This qualitative case study utilized critical media literacy to guide the analysis of the depiction of racially and ethnically diverse college students in contemporary popular films. Participants in this study were racially and ethnically diverse undergraduate students enrolled at a private, predominantly White institution in the United States. Three primary themes emerged from this study. First, students of color were more apt to recognize stereotypical portrayals of people of color in the films, whereas White students’ responses were more attuned with color-blind racial ideology (CBRI). Second, media-centered discussions provided an outlet for students of color to share their personal experiences with racism, stereotyping, and prejudice. In doing so, students of color seek to build the cultural competence of peers who may hold CBRI beliefs. Finally, this study presents a need for critical media literacy. Regardless of race and/or ethnicity, the undergraduates who participated in our study communicated an importance of examining media messages, such as stereotypes of people of color, from a critical perspective. For college and university administrators, such as chief diversity officers, this study is significant in presenting a means for engaging students, faculty, and other stakeholders in dialogue about racial issues in the hopes of fostering a more welcoming campus racial climate for students of color