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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 541 records · Page 30
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Hybrid chip-on-board LED module with patterned encapsulation

Light modules and methods of forming light modules are disclosed. A light module includes a first plurality and a second plurality of light emitting elements configured to emit, respectively, a first light and a second light, and both arranged on a substrate. An encapsulation layer is disposed over the first and second plurality of the light emitting elements, and a wavelength converting element is dispersed in the encapsulation layer. A concentration of the wavelength converting element in the encapsulation layer varies, is larger over the first plurality of light emitting elements and is smaller over the second plurality of light emitting elements.

Soer, Wouter Anthon↗
DOE OSTI2022

Compact imaging system using a co-linear, high-intensity LED illumination unit to minimize window reflections for background-oriented schlieren, shadowgraph, photogrammetry and machine vision measurements

One aspect of the present disclosure is an imaging system including an optical sensor defining an optical axis. The system further includes a light source. The system may include an optical beam splitter, and may also include an optional diffusing lens that may be configured to diffuse and/or collimate light from the light source and direct light exiting the diffusing lens to the optical beam splitter. The optical beam splitter is configured to direct light from the light source along the optical axis of the optical sensor.

Bathel, Brett F.↗
DOE OSTI2017

Experiences from Implementing Waste Led Decommissioning in Practice at a Research Facility - 17216

The decommissioning of MAX-lab (a national accelerator laboratory hosted by Lund University) has been performed using a risk-based concept for dismantling of the equipment and clearance measurement of the facility. To support the concept, a radiological characterisation was performed containing scintillation and dose rate measurements as well as nuclide vector determination based on nuclide specific analysis of the activity content in material samples. This paper describes the decommissioning at MAX-lab, performed during 2015 and 2016. Dismantled waste was sent to the Studsvik site for treatment. Clearance measurements of material were performed at MAX-lab and at the Studsvik site. The levels of activity have been compared with the threshold values in the Swedish clearance regulations (material or buildings for free use) and the detected levels are below the limits for clearance of material with some exceptions. Activity above the clearance levels were found in a few locations in the facility. After removal of installations and small amounts of building structures at these locations clearance of the facility is possible. Keywords: Risk based approach, fast decommissioning, on- and offsite material clearance. (authors)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2024

Final Report (October 2024): University of Tennessee, Knoxville (UTK) contribution to: FusMatML: Machine Learning Atomistic Modeling for Fusion Materials Collaborative Project led by Dr. Aidan Thompson, Sandia National Laboratory

The rapid growth of the field of Machine Learning Inter-Atomic Potentials (MLIAP) has lead to a profusion of methods, all of which have some similarity to each other, but each also restricted to particular design choices, often arrived at in a rather ad hoc fashion. Beyond anecdotal evidence, and some benchmarking studies on specific problems, little progress has been made in developing design principles for MLIAPs. The goal of this project is to use machine learning, data science, and uncertainty quantification methods to optimize the design choices for MLIAP.

Density functional theory, Helium and Hydrogen↗