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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Designers have many options for how to encode knowledge, although most are based on declarative representations. This paper explores the use of questions to represent knowledge.
This paper focuses on the analysis and identification of technology development portfolios designed to meet the scientific and mission objectives of the Mars Exploration Program.
GPS radio occultations captured by receivers on board the CHAMP and SAC-C spacecraft were used to study the evolution of temperature profiles in the Arctic region north of 65 degrees.
Tradeoffs between the different kernel methods and performance relative to more traditional methods are discussed.
The rapid development of space instrumentation is increasingly important in this faster, better, cheaper era.
Processes, just like any project, are designed to meet a set of requirements.
The December 18, 1999, launch of NASA's Terra satellite put two multispectral thermal infrared imaging instruments into Earth orbit. Experiments with airborne instruments have demonstrated that the data from such instruments can be used to detect volcanic SO2 plumes and clouds.
Organizational learning is an umbrella term that covers a variety of topics including; learning curves, productivity, organizational memory, organizational forgetting, knowledge transfer, knowledge sharing and knowledge creation. This treatise will review some of these theories in concert with a model of how organizations learn.
The Planetary Data System (PDS) is an active science data archive managed by scientists for NASA's planetary science community. With the advent of the World Wide Web the majority of the archive has been placed on-line as a science digital libraty for access by scientists, the educational community, and the general public.
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We describe our effort in extending this work beyond the initial software contruction. Our area of focus is determining the rate of fault injection over a sequence of successive builds, first observing that software faults may be seen to fall into two distinct classes some faults are incorporated during the initial coding effort, while others are added in successive software builds.
Modern geophysical techniqes of volcano monitoring allow simultaneous observations of a wide variety of parameters relevant to understanding how volcanoes work.
Among other challenges from NASA's X2000 Technology Development Program, affordability and miniaturizaton are prominent criteria, which 1) preclude the traditional solutions for mission reliability that rely on customer-built hardware and extensive component/subsystem replication, and 2) call for commercial-of-the-shelf (COTS) based approaches incorporating novel, practical fault tolerance techniques.
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This paper describes the design of an ASIC performing the Viterbi decoder function with a constraint length of 15 and at a speed of 4.4 Mb/s. The architecture of the chip is described, as well as the design challenges which were overcome. The author also describes the successful application of the design system.
This paper describes the design of an ASIC performing the Viterbi decoder function with a constraint length of 15 and a speed of 4.4 Mb/s. The architecture of the chip is described, as well as the design challenges which were overcome. The author also describes the successful application of the design system.
The synoptic perspective and rapid mode of data acquisition provided by remote sensing are well-suited for the study of volcanic SO2 plumes. In this paper we describe a plume-mapping procedure that is based on image data acquired with NASA's airborne Thermal Infrared Multispectral Scanner (TIMS).