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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 1,585 records · Page 88
All sourcesNASA NTRSDOE OSTI
DOE OSTI2015

Data Analysis for Explosive Firesets [Poster]

I analyzed the data from various detonators at different initial voltages to find the RLC values (resistance, inductance, capacitance) of the fireset. The data I was given contained a current and voltage for each time value taken on nanosecond intervals. From this, I was able to make plots of several variables to try and find which if any of variables correlated with a burst or a go. These results will allow us to fully understand what is required to achieve a burst in the bridgewire so that we can know what is safe or what will never cause detonation. We may also be able to predict the outcome of using the same fireset with different detonators or with different sizes or materials of bridgewire.

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
DOE OSTI2016

Environmental Baseline Survey for Proposed Land Use Permit Modification for Expansion of the Dynamic Explosive Test Site (DETS) 9940 Main Complex Parking Lot.

The approach was to perform a document search, supplemented by a visual site inspection, to identify potential environmental contamination associated with the property. Factors evaluated included hazardous substances; petroleum products and derivatives; environmental restoration sites; areas of concern; storage tanks; oil/water separators; grease traps; wash racks; waste tanks; pesticides; military munitions/ordnance; medical or bio-hazardous waste; radioactive waste; solid/municipal waste; indoor air quality; groundwater; wastewater treatment, collection, and disposal/discharge; drinking water quality; utilities; asbestos; polychlorinated biphenyls (PCBs); radon; lead-based paint; cultural resources; floodplains; and natural/biological resources.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2016

Research Performance Progress Report: Diverging Supernova Explosion Experiments on NIF

The aim of this project was to design a series of blast-wave driven Rayleigh-Taylor (RT) experiments on the National Ignition Facility (NIF). The experiments of this kind are relevant to mixing in core-collapse supernovae (ccSNe) and have the potential to address previously unanswered questions in high-energy density physics (HEDP) and astrophysics. The unmatched laser power of the NIF laser offers a unique chance to observe and study “new physics” like the mass extensions observed in HEDP RT experiments performed on the Omega laser [1], which might be linked to self-generated magnetic fields [2] and so far could not be reproduced by numerical simulations. Moreover, NIF is currently the only facility that offers the possibility to execute a diverging RT experiment, which would allow to observe processes such as inter-shell penetration via turbulent mixing and shock-proximity effects (distortion of the shock by RT spikes).

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2017

Modeling radionuclide migration from underground nuclear explosions

The travel time of radionuclide gases to the ground surface in fracture rock depends on many complex factors. Numerical simulators are the most complete repositories of knowledge of the complex processes governing radionuclide gas migration to the ground surface allowing us to verify conceptualizations of physical processes against observations and forecast radionuclide gas travel times to the ground surface and isotopic ratios

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2018

Cyclops I: Modeling Error Study for Inertially Confined Detonation of Insensitive High Explosive (IHE) PBX-9502

A validation study is performed using the hydrodynamics code PAGOSA to assess the accuracy of reflected shock, burn front propagation, and Photon Doppler Velocimetry (PDV) predictions using several burn models and strength models. Experimental data collected from proton radiography (pRad) is compared to burn front propagation times and reflected shock patterns. Burn front isochrones are computed and the lag time for the burn front is quantified for a given burn model. The effect of strength models and damage are assessed by comparison of simulations to experimental PDV data.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2019

The Effects of High-Altitude Nuclear Explosions on Transmission Grids

Assessing impact of high-altitude electromagnetic pulses (HEMP) resulting from the effects of nuclear weapons is a problem of great concern. Some previous studies have estimated the extent and duration of an outage to be severe. In this report, we quantify the extent and duration of an outage resulting from HEMP E1 to the best of our ability given existing knowledge and tools. Our analysis focuses on the impact to civilian consumer of electricity as opposed to the impact on military responsiveness.

42 ENGINEERING↗