Resonance testing of space shuttle thermoacoustic structural specimen

The resonance testing of a structural specimen related to the space shuttle vehicle is described. The specimen consisted of a thin aluminum skin reinforced by hat-section stringers and supported by two ribs or bulkheads of corrugated web. A representative section of the space shuttle thermal protection system was bonded to the outer surface of the skin. The tests were completed by using miniature accelerometers to collect vibration data from locations forming a predetermined mesh over the tiles and base structure. The signals were recorded on FM magnetic tape and subsequently analyzed on a modal analysis system

Shock Metamorphism in Impact Melt Rocks from the Gow Lake Impact Structure, Saskatchewan, Canada

Meteorite impact craters are the dominant surface feature on most terrestrial planetary bodies [1] and are gathering increased interest with the continued exploration of the Solar System. It is worth, then, taking a fresh look at impact craters on Earth, in particular those which have not yet been studied in great detail, like Gow Lake, in order to see if new techniques will shed light on some of the remaining questions about them

ESTIMATION OF COSTS FOR MAINTAINING LANDSCAPE ELEMENTS BY THE EXAMPLE OF SOUTHWEST GERMANY

In comparison to large-scale natural landscapes separated from extensively used agricultural production landscapes in North America or Australia, German and Central Europe landscapes are all charac-terised by predominantly agricultural landscapes with few "rests of nature". Due to the high population density, different types of land users demand different functions of the landscape. In addition to food production, there is a high demand for protection of cultural heritage by caring for e.g. hedge-rows in the landscape. The aim of this study was to estimate the costs arising from the maintenance of landscape elements in landscapes situated on land with different site conditions. As an example, the distribution of hedgerows on sites of varying agricultural quality were considered. The calculations were undertaken on the entire area of Baden-Wuerttemberg in Southwest Germany, comprising various administrative districts. The association between ecological and economic information was analysed statistically and with the help of GIS. The results indicate that the costs for landscape element protection differ within the state of Baden-Wuerttemberg and that there is a lot of economic pressure against hedgerow biotopes existing in certain districts. Measures for protection such as agri-environmental programmes should consider the different landscape-dependent costs.Resource /Energy Economics and Policy,

Toward quantification of strain-related mosaicity in shocked lunar and terrestrial plagioclase by in situ micro-X-ray diffraction

Studies of shock metamorphism of feldspar typically rely on qualitative petrographic observations, which, while providing invaluable information, can be difficult to interpret. Shocked feldspars, therefore, are now being studied in greater detail by various groups using a variety of modern techniques. We apply in situ micro-X-ray diffraction (μXRD) to shocked lunar and terrestrial plagioclase feldspar to contribute to the development of a quantitative scale of shock deformation for the feldspar group. Andesine and labradorite from the Mistastin Lake impact structure, Labrador, Canada, and anorthite from Earth's Moon, returned during the Apollo program, were examined using optical petrography and assigned to subgroups of the optical shock level classification system of Stöffler (1971). Two-dimensional μXRD patterns from the same samples revealed increased peak broadening in the chi dimension (χ), due to strain-related mosaicity, with increased optical signs of deformation. Measurement of the full width at half maximum along χ (FWHMχ) of these peaks provides a quantitative way to measure strain-related mosaicity in plagioclase feldspar as a proxy for shock level

Magic

In lieu of an abstract, below is the essay\u27s first paragraph. I was just a little girl when I fell in love with my daddy, a short man with a big heart. He would take me up to the Burning Bush park to swim with me and teach me how to dive. I would never go off the high dive but daddy told me if I tried it, he\u27d buy me an ice cream cone. I thought I was going to drown but it was worth it; nothing ever tasted as good as that chocolate ice cream cone

INTEGRATING SUSTAINABILITY IN AGRICULTURE - TRADE-OFFS AND ECONOMIC CONSEQUENCES DEMONSTRATED WITH A FARM MODEL IN BAVARIA

Within the German "Research Alliance on Agroecosystems Munich" (Forschungsverbund Agrarökosysteme München, FAM) optimal land use strategies are investigated since 1990 in terms of minimization of environmental impacts and maximization of profit from agricultural lands (Auerswald et al. 2000). For this purpose a conventional agricultural land use system was converted into two more sustainable forms of land use. One part of the farm was converted into an integrated land use system with reduced tillage, direct seeding methods and catch crops to minimize nutrient losses and to prevent soil erosion hazards. The other part of the farm was converted into a biological land use system with the omission of mineral fertilizers and pesticides and the enrichment of crop rotation. In order to evaluate changes in the state of the agroecosystem a goal and indicator system was elaborated which was aimed to represent important issues of sustainable agriculture. With the help of the goal and indicator system the impact of land use on issues of sustainability can be assessed. The indicators are furthermore integrated into a farm model to assess the implications of the realization of environmental issues in agriculture. For this purpose the model system MODAM (Zander & Kächele 1999) was used to compare different land use options at the farm level. The model system simulates agricultural land use, calculates the economic returns and runs farm optimizations with a linear programming tool. The integration of agro-environmental indicators in the model framework enables a multiple goal optimization and the calculation of trade-offs. For this study soil erosion was assessed with the algorithms of a site-specifically adapted version of the USLE (ABAG, Schwertmann et al. 1987). Optimization runs show, that e.g. soil conservation measures may not only improve soil conservation, but also the economic situation. A slight improvement of soil conservation results in marginal opportunity costs for the farm. With the realization of a higher level of soil protection opportunity costs rise exponentially. The calculated opportunity costs can give valuable hints on bottlenecks of the realization of sustainable agriculture and help to identify reasonable incentives for a better agriculture. Furthermore conflicts between divagating goals can be identified to find optimal pathways of a sustainable development of agriculture.Environmental Economics and Policy, Farm Management,

The persistence of power: Reflections on the power dynamics in a Merging of Knowledge research project

Collaborative research approaches emphasise the need to transform the way the academic community produces science by integrating knowledge from different disciplines, but also by including non-academic knowledge in order to address the challenges of sustainability and social justice. This approach – known in the literature on sustainability science as transdisciplinarity – has been used increasingly in research to resolve sustainability problems, including those related to poverty and socio-economic inequalities. This article seeks to shed light on the power dynamics that exist and emerge in transdisciplinary processes by analysing a case study on food poverty. Following Fritz and Meinherz’s (2020) approach, I use Amy Allen’s (1998) typology of power to track and trace the way that power played out between and within actor groups in a project that applied a transdisciplinary methodology known as the ‘Merging of Knowledge’. Although the Merging of Knowledge model seeks to identify and address power differentials between the participating groups, power relations remain complex, dynamic and – to some extent – inevitable. Collaborative processes would benefit from an analysis of the way that power dynamics emerge, persist and evolve to enhance awareness of different forms of power that coexist in research, and to ensure that imbalances present outside the research process are not reproduced within it