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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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At least 361 records · Page 20
All sourcesNASA NTRSDOE OSTI
NASA NTRSDate not supplied

Lunar In-situ Resource Utilization Concept to Reality

ISRU is a capability involving multiple elements to achieve final products (mobility, product storage and delivery, power, crew and/or robotic maintenance, etc.) ‘ISRU’ does not exist on its own. By definition, it must connect and tie to users/customers of ISRU products and services Living Off the Land: ISRU involves any hardware or operation that harnesses and utilizes ‘in-situ’ (local) resources to create products and services for robotic and human exploration. Resource Examples •Water •Oxygen •Hydrogen •Carbon •Metals •Silicon •Nitrogen •Regolith/Rock •Discarded materials Product Examples •Propellant •Life Support Consumables •Feed stock for •Additive manufacturing •Construction •Agriculture substrate and/or fertilizer

lunar↗
NASA NTRSDate not supplied

Expectation vs. Reality: The Sunrise Problem Applied to Probabilistic Risk Assessment

The Sunrise Problem is succinctly stated as a question: “what is the probability that the sun will rise tomorrow?” Attempts to answer this seemingly simple question reveal unexpected incongruities between statistical/probabilistic estimates and “real-world” expectations. Rather than being a purely philosophical problem, similar incongruities can be found in reliability and probabilistic risk assessment (PRA) analyses. These differences between statistical predictions and demonstrated reliability can result in analysis shortcomings that should be addressed and resolved. This presentation will begin by discussing the nature of the Sunrise Problem and how it applies to PRA and reliability. Examples of the Sunrise Problem in a PRA estimate will also be included, along with tips to identify and resolve the shortcomings that result from these anomalous situations.

Sunrise Problem↗
NASA NTRS2023

Contesting with the Ganges Water Machine in South Asia: Theory versus Reality

Recently, there has been much interest in how to manage the water resources of the Ganges River Basin (GRB), the cradle of Asian civilization, currently supporting >500 million people. This also includes cleaning up the Ganges river, regarded as one of the most polluted mega-rivers of the world. Historically, the transboundary Ganges river and its tributaries, flowing through India, Nepal, and Bangladesh, have become extensively polluted and disrupted, mostly because of river engineering and increased discharge of industrial and urban waste. Compounding the problem, in the past few decades, intense groundwater abstraction from the GRB aquifers has led to unprecedented groundwater level depletion in some locations. At present, the GRB groundwater levels are strongly influenced by depth-dependent abstraction, which is predicted to intensify in the future, given the increasing water demand. Thus, with impending climate change, designing the coupled river water–groundwater management necessary to meet the goal for sustainable access to clean water for a huge population, has become an arduous challenge.

Aquifers↗
NASA NTRSDate not supplied

Misconceptions and Reality of Orbital Debris Risk

Since the formal commissioning of the NASA Orbital Debris Program Office in the 1970s, the risks of orbital debris have gradually become more widely known to the community of space experts. The subject has even entered the mainstream of popular culture (e.g., the 2013 film “Gravity”). Growth in professional and public interest has been mirrored by a growth in misconceptions concerning the nature and scope of orbital debris risks and how to “fix the problem.” This is a global issue, both complicated and potentially expensive, so it is important that problem solvers and policy makers ask the correct questions and address the right problems. This paper will identify and clarify a select number of these misconceptions and highlight the best cost-effective solutions.

Mark Matney↗
NASA NTRSDate not supplied

Misconceptions and Reality of Orbital Debris Risk

Since the formal commissioning of the NASA Orbital Debris Program Office in the 1970s, the risks of orbital debris have gradually become more widely known to the community of space experts. The subject has even entered the mainstream of popular culture (e.g., the 2013 film “Gravity”). Growth in professional and public interest has been mirrored by a growth in misconceptions concerning the nature and scope of orbital debris risks and how to “fix the problem.” This is a global issue, both complicated and potentially expensive, so it is important that problem solvers and policy makers ask the correct questions and address the right problems. This paper will identify and clarify a select number of these misconceptions and highlight the best cost-effective solutions.

Mark Matney↗
NASA NTRSDate not supplied

Autonomous Operations: Expectations vs. Reality (at NASA)

- Future deep-space exploration drives need for autonomy - Communication time delay between Earth and deep-space system precludes Earth-based remote-control - Autonomy is: - Acting separately from others (Webster’s Dictionary) - Able to independently choose how to act to achieve goals - Autonomy is a relative term: Autonomous from whom? for what purpose? and when? - Autonomous Operations is: - Automatically controlled operation of a system that replaces human effort - Able to perform a pre-specified set of instructions on its own - Automation is a tool that enables and supports autonomy

Autonomous Operation↗