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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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Imaging X-ray Polarimetry Explorer Mission Overview and Systems Engineering Status
The Imaging X-ray Polarimetry Explorer (IXPE) is a space-based observatory that will have the capability to measure the polarization of X-rays from astrophysical sources. IXPE will improve sensitivity over OSO-8, the only previous X-ray polarimeter, by two orders of magnitude in required exposure time. IXPE will yield insight into our understanding of X-ray production in objects such as neutron stars as well as stellar and supermassive black holes. IXPE measurements will provide new dimensions for probing a wide range of cosmic X-ray sources-including active galactic nuclei (AGN) and microquasars, pulsars and pulsar wind nebulae, magnetars, accreting X-ray binaries, supernova remnants, and the Galactic center.
Exploration Medical Capability Systems Engineering Overview and Update
No abstract available
Three Viewpoints for Analysis and Synthesis in Systems Engineering
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Systems Engineering Principles and the Challenges in Deriving Them
No abstract available
A Comparative Study on Computation of Cumulative Distribution Function in Predicting Time of Failure of Engineering Systems
Estimating accurate Time-of-Failure (ToF) of a system is key in making the decisions that impact operational safety and optimize cost. In this context, it is interesting to note that different approaches have been explored to tackle the problem of estimating ToF. The difference is in part characterized by different definitions of the hazard zones. The conventional definition for the cumulative distribution function (CDF) calculation is assumed to have well-defined hazard zones, that is, hazard zones defined as a function of the system state trajectory. An alternate method suggests the use of hazard zones defined as a function of the system state at time , instead of hazard zones defined as a function of system state up to and including time k (Acuna and Orchard 2018, 2017). This paper explores these differences and their impact on ToF estimation. Results for the conventional CDF definition indicated that, (i) the cumulative distribution function is always an increasing function of time, even when realizations of the degradation process are not monotonic, (ii) the sum of all probabilities is always 1 and does not need to be normalized, and (iii) all probabilities are positive and less than or equal to 1. Similar results are not observed for CDF calculation with hazard zones defined as a function only of the system state at time . Results for ToF estimation using Acuna's definition differ, suggesting that there is an underlying assumption of independence in the hazard zone definition. Therefore, we present an alternate definition of hazard zone which guarantees the properties of a well-defined CDF with a more straightforward ToF definition.
Towards a Model Based Systems Engineering Mass Properties Toolset
No abstract available
Using Executable SysML Models to Generate System Engineering Products
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Acs Short Course: Cryogenic Systems Engineering with Cryocoolers
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Identifying Where Mission Assurance Can Benefit from Model Based Systems Engineering
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Exploration Medical Capability Systems Engineering Overview and Update
No abstract available
Habitable-Zone Exoplanet Observatory (HabEx) Telescope: Systems Engineering and STOP Modeling
No abstract available