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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 505 records · Page 28
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Functionalized metal chalcogenides of partially it crystalline phase

The present disclosure relates to a composition that includes a metal chalcogenide having a surface and a ligand, where the ligand is covalently bound to the surface. In some embodiments of the present disclosure, the metal chalcogenide may be defined by MXz, where Z is between 1 and 3, inclusively, M (a metal) includes at least one of Sc, Zr, Hf, Zr, Ti, Nb, Ta, V, Mo, Cr, Re, W, S, Pt, Fe, Cu, Sb, In, Zn, Cd, P, and/or Mn, and X (a chalcogenide) includes at least one of S, Se, and/or Te.

Zhang, Hanyu↗
DOE OSTI2021

Production of synthesis gas from natural gas with copper—iron—manganese oxide oxygen carriers/catalysts via partial oxidation and dry reforming processes

Materials, methods of making, and methods of providing a trimetallic oxygen carrier for converting methane containing fuel to synthesis gas. The trimetallic oxygen carrier comprises CuxFeyMnzOt, where CuxFeyMnzOt is a chemical composition with 0 < x ≤ 3 and 0 < y ≤ 3 and 0 < z ≤ 3 and, 0 < t ≤ 5. For example, CuxFeyMnzOt may be one of CuMnFeO 4 , CuFe 0.5 Mn 1.5 O 4 , CuFeMn 2 O 4 , CuFe 2 MnO 4 , or Cu impregnated on FerMnsOu, Fe impregnated on CurMnsOu, Mn impregnated on CurFesOu where r > 0, s > 0 and u > 0 and combinations thereof. Reaction of trimetallic CuxFeyMnzOt with methane generates a product stream comprising at least 50 vol. % CO and H 2 .

Siriwardane, Ranjani V.↗
DOE OSTI2021

Partial Wave Analysis of Meson Resonances That Decay K*K¯ Using Data from the GlueX Experiment

The GlueX experiment housed in Hall D of the Thomas Jefferson National Laboratory was created to map the light meson spectrum in order to contribute to the Standard Model of particle physics by strengthening our understanding of the strong interaction. GlueX is a medium-energy photoproduction experiment that utilizes a linearly polarized photon beam to create hadronic forms of matter.

Cole, Sebastian↗
DOE OSTI2022

Partial Wave Analysis of the omega pi^- Final State Photoproduced at GlueX

The meson has traditionally been understood as the bound state of a quark and an anti-quark, but there is experimental evidence for exotic meson states, which have properties that cannot be produced by this quark-antiquark model. One candidate for such exotic systems is hybrid meson, predicted by lattice QCD, which includes gluonicexcitation in its wavefunction. One of the prominent decay modes of the lightest predicted exotic hybrid is expected to be b1pi. THis dissertation presernts an analysis of the gamma rho -> omega pi- Delta ++ channel produced at the GlueX experiment, in the mass range where the b1(1235) meson is prominent. An amplitude analysis is performed on the decay of the omega pi- system, in order to extract the resonance parameters of the b-1, as well as analyze the resonant and non-resonant background.

Schertz, Amy↗
DOE OSTI2024

AGR-5/6/7 Partial Mass Balance

AGR-5/6/7 goals and test train configuration, status of AGR-5/6/7 mass balance work, preliminary results of Ag-110m, Cs-134, and Eu-154.

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
DOE OSTI2021

Techno-Economic Impact of Partial String Failurein Multi-string Energy Storage Systems

Electric utilities and large industrial/commercial customers, which integrate multi-MW multi-string energy storage systems (ESS), are typically at a significant risk of string failure. This results in loss of system performance and capacity. In order to evaluate the accurate costs and benefits associated with a particular battery system, it is essential to incorporate the costs associated with battery string failure and, as a result, reduced capacity. This report analyzes how the economic losses can be estimated based on market rules and ESS availability. A framework for calculation of economic losses is developed and implemented with an illustrative string failure case for Independent System Operator (ISO-NE) forward capacity market. Further scenarios and case studies are analyzed by varying the probability of string failure as well as the capacity bid into the market. These scenarios are used to assess the variability of economic losses and the impact of string failure on final realized benefits from the battery's market participation.

Fotedar, Vanshika↗
DOE OSTI2025

Partial program correctness

Explore the source record for details and available documents.

C++, optimization, undefined behavior, contracts↗
DOE OSTI2025

Chemical Reactor Network Modeling of Ammonia Rich-Quench-Lean Combustion Using a Partially Stirred Reactor Approach

Ammonia is a promising alternative fuel, but its use is challenging due to low flammability and high nitrogen oxide (NOx) emissions. Two-stage rich-quench-lean (RQL) combustion strategies have shown promise in reducing NOx emissions. This approach involves two stages: a rich stage that oxidizes part of the fuel and decomposes ammonia into hydrogen, and a lean stage that burns out the hydrogen and residual ammonia. Researchers used a chemical reactor network model to study the effects of heat loss and mixing on emissions performance. They found that heat loss and reduced mixing rates can lead to increased NOx emissions and N2O formation. The results will inform the development of optimized two-stage RQL combustors for ammonia, with a focus on minimizing NOx emissions and improving overall efficiency.

ammonia combustion↗