Single Event Upset and Latchup Sensitive Devices in Satellite Systems

We present a decision tree to systematically evaluate the potential use of single event sensitive devices in spacecraft systems. We present several concrete examples of branches on the tree

Factors Associated with Blockages to Outdoor Recreation Participation: A State Survey

Data from a random sample of Ohio residents were used in an attempt to isolate factors that were hypothesized to be related to outdoor recreation blockages. The study revealed that socio-demographic variables failed to explain the variance in factor scores created to measure blockages to outdoor recreation. Findings from descriptive statistics and the factor analyses are discussed in a planning context

Antecedents of Job Burnout Among Small Company Presidents

Several studies suggest that small business presidents  may be especially susceptible  to job burnout because of their personality traits  and the unique  organizational demands of their position. This issue  has not been directly tested in small business research, however. This exploratory study examined the relationship of several personal, work, and environmental characteristics to job burnout among  2 I 5 small company presidents. A series of regression analyses found that five variables explained 44 percent of the variation in burnout levels among small business presidents. Each of the five predictor variables was individually significantly related to burnout. The results of this study suggest that effective  coping strategies for job burnout among small company presidents may be both individual- and situation-specific

Aerial Neutron Detection of Cosmic-Ray Interactions with the Earth's Surface

We have demonstrated the ability to measure the neutron flux produced by the cosmic-ray interaction with nuclei in the ground surface using aerial neutron detection. High energy cosmic-rays (primarily muons with GeV energies) interact with the nuclei in the ground surface and produce energetic neutrons via spallation. At the air-surface interface, the neutrons produced by spallation will either scatter within the surface material, become thermalized and reabsorbed, or be emitted into the air. The mean free path of energetic neutrons in air can be hundreds of feet as opposed to a few feet in dense materials. As such, the flux of neutrons escaping into the air provides a measure of the surface nuclei composition. It has been demonstrated that this effect can be measured at long range using neutron detectors on low flying helicopters. Radiological survey measurements conducted at Government Wash in Las Vegas, Nevada, have shown that the neutron background from the cosmic-soil interactions is repeatable and directly correlated to the geological data. Government Wash has a very unique geology, spanning a wide variety of nuclide mixtures and formations. The results of the preliminary measurements are presented

Tools for Assessing Climate Impacts on Fish and Wildlife

Climate change is already affecting many fish and wildlife populations. Managing these populations requires an understanding of the nature, magnitude, and distribution of current and future climate impacts. Scientists and managers have at their disposal a wide array of models for projecting climate impacts that can be used to build such an understanding. Here, we provide a broad overview of the types of models available for forecasting the effects of climate change on key processes that affect fish and wildlife habitat (hydrology, fire, and vegetation), as well as on individual species distributions and populations. We present a framework for how climate-impacts modeling can be used to address management concerns, providing examples of model-based assessments of climate impacts on salmon populations in the Pacific Northwest, fire regimes in the boreal region of Canada, prairies and savannas in the Willamette Valley-Puget Sound Trough-Georgia Basin ecoregion, and marten Martes americana populations in the northeastern United States and southeastern Canada. We also highlight some key limitations of these models and discuss how such limitations should be managed. We conclude with a general discussion of how these models can be integrated into fish and wildlife management

Autonomes Fahren – ein Top-Down-Ansatz

This paper presents a functional system architecture for an “autonomous vehicle” in the sense of amodular building block system. It is developed in a topdown approach based on the definition of the functional requirements for an autonomous vehicle and explicitly combines perception-based and localization-based approaches. Both the definition and the functional system architecture consider the aspects operating by the human being, mission accomplishment, map data, localization, environmental and self-perception as well as cooperation. The functional system architecture is developed in the context of the research project “Stadtpilot” at the Technische Universität Braunschweig.In diesem Artikel stellen wir eine funktionale Systemarchitektur für ein “autonom fahrendes Straßenfahrzeug” vor, die im Sinne eines modularen Baukastensystems entworfen ist. Sie wurde in einemTop- Down-Ansatz ausgehend von einerDefinition des Funktionsumfangs eines “autonom fahrenden Straßenfahrzeugs” entwickelt und führt explizit wahrnehmungsbasierte und lokalisierungsbasierte Ansätze zusammen. Sowohl dieDefinition des Funktionsumfanges als auch die funktionale Systemarchitektur berücksichtigen die Aspekte Bedienung, Missionsumsetzung, Karten, Lokalisierung, Umfeld- und Selbstwahrnehmung sowie Kooperation. Die Ergebnisse basieren unter anderem auf Erkenntnissen aus dem Projekt “Stadtpilot” der Technischen Universität Braunschweig