CREEPY: Computationally-Redundant, Energy-Efficient Processing for Y'all.
Abstract not provided.
Deng, Bobin↗
SEARCH · Engineering Papers
Results for “Y”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Bandgap Dependence of Near-Conduction Band State in (AgyCu1-y)(InXGa1-x)Se2 Solar Cells
(Ag, CU) (In,Ga)Se2 -based solar cells have achieved high collection efficiencies, but defects still limit efficiencies well below the theoretical limit. The near-conduction band defect, typically observed at EV+0.98 eV, has been ubiquitous across (Ag,Cu)(In,Ga)Se2 samples from multiple vendors. The current work explores a wider range of composition and demonstrates the trap energy varies relative to the valence band but is approximately constant relative to the conduction band (~Ec-0.13 eV). There is also no definitive dependence of the trap concentration on composition.
ACIGS↗
Microstructure and Hard Magnetic Properties of Sm 1-x Zr x (Fe,Co) 11.3-y Ti 0.7 By Ingots and Thick Melt-Spun Ribbons
Permanent magnets made from Sm(Fe,Co) 12 -based compounds are being actively pursued through nanostructuring and powder metallurgy. This study was aimed at the development of hard magnetic properties in bulk as-cast alloys and in melt-spun alloys for very low wheel speeds. Slower solidification rates and alloying with Zr promote the tetragonal ThMn 12 -type crystal structure, whereas higher solidification rates and alloying with B replace the ThMn 12 structure type with the TbCu 7 structure type. When introduced simultaneously, Zr and B dramatically reduce the alloy solidification rates required for both the refinement of the 1:12 crystallites and their replacement with the 1:7 phase. In bulk arc-melted alloys, this allowed for a microstructure of separated 1:12 crystallites 1–3 μm in size, although, because of the ferromagnetic nature of a minority phase, the coercivity of these fine-grained alloys reached only 0.73 kOe. A moderately accelerated solidification further refined the 1:12 crystallites and increased the coercivity; a Sm 0.7 Zr 0.4 (Fe,Co) 10.8 Ti 0.7 B 0.5 alloy exhibited a coercivity of 1.5 kOe and a maximum energy product of 3.4 MGOe when it was melt-spun into a 0.26-mm-thick ribbon. A more rapid solidification suppressed the 1:12 phase and after annealing at 800–850 °C, the alloys modified with Zr and B developed reasonably high coercivity and maximum energy product even when melt-spun at a wheel speed of 6 m/s. For the above-mentioned alloy, these values were 4.1 kOe and 7.8 MGOe, respectively. Further, a similarly processed very-Sm-lean Sm 0.5 Zr 0.6 (Fe,Co) 10.6 Ti 0.7 B 0.7 alloy exhibited a remanence of 8.8 kG and an energy product of 7.4 MGOe.
36 MATERIALS SCIENCE↗
A far‐red‐emitting (Gd,Y) 3 (Ga,Al) 5 O 12 :Mn 2+ ceramic phosphor with enhanced thermal stability for plant cultivation
Abstract As for plants, far‐red (FR) light with wavelength from 700 nm to 740 nm is critical for processes of photosynthesis and photomorphogenesis. Light‐controlled development depends on light to control cell differentiation, structural and functional changes, and finally converge into the formation of tissues and organs. Phosphor converted FR emission under LED excitation is a cost‐effective and high‐efficient way to provide artificial FR light source. With the aim to develop an efficient FR phosphor that can promote the plant growth, a series of gadolinium yttrium gallium garnet (GYGAG) transparent ceramic phosphors co‐doped with Mn 2+ and Si 4+ have been fabricated via chemical co‐precipitation method, followed sintered in O 2 and hot isostatic pressing in this work. Under UV excitation, the phosphor exhibited two bright and broadband red emission spectra due to Mn 2+ : 4 T 1 → 6 A 1 spin‐forbidden transition, and one of which located in the right FR region. And then, Ce 3+ ions were co‐doped as the activator to enhance the absorption at blue light region and the emission of Mn 2+ . It turns out that the emission band of GYGAG transparent ceramic phosphors matches well with the absorption band of phytochrome P FR , which means they are promising to be applied in plant cultivation light‐emitting diodes (LEDs) for modulating plant growth. Besides, the thermal stability of this material was investigated systematically, and an energy transferring model involves defects was also proposed to explain the phenomenon of abnormal temperature quenching.
Qiu, Xuting↗
Dioxovanadium(V) complexes of Schiff and tetrahydro-Schiff bases encapsulated in zeolite-Y for the aerobic oxidation of styrene
Abstract not provided
Ding, Zhongzhen↗
Data: Origin of Rapid Delithiation In Secondary Particles Of LiNi0.8Co0.15Al0.05O2 and LiNiyMnzCo1–y–zO2 Cathodes
Explore the source record for details and available documents.
Wolfman, Mark↗
The Project Y Spies [Slides]
A talk on the subject of the various spies that were present at Los Alamos during the Manhattan Project.
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
The Women of Project Y - A Snapshot of Women at Wartime Los Alamos
20 slides featuring historical women at LANL written by Madeline Whitacre, Laura McGuiness, and Heather Hershey
96 KNOWLEDGE MANAGEMENT AND PRESERVATION↗
Women of Project Y. A Snapshot of Women at Wartime Los Alamos [Slides]
A brief history of women’s roles at Los Alamos National Laboratory during the Manhattan Project. Then, a focused section on one female lab employee, Miriam White Campbell.
96 KNOWLEDGE MANAGEMENT AND PRESERVATION↗
Nuclear Deactivation and Downgrade of Enriched Uranium Facilities at the Y-12 National Security Complex
Prior to transfer to DOE-EM for demolition, accountable nuclear materials must be removed to eliminate all facility security requirements and downgrade to Hazard Category 3 or Radiological status.
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
Molecular dynamics simulation of yttria (Y 2 O 3 ) nanoparticle impacts
Abstract not provided.
77 NANOSCIENCE AND NANOTECHNOLOGY↗
Nuclear Deactivation and Downgrade of Enriched Uranium Facilities at the Y-12 National Security Complex
Facility Disposition and Modernization Partnership includes 1) Leading modernization efforts through infrastructure investments, technology development, and facility stewardship; 2) Development and implementation of the nuclear deactivation and downgrade strategy for nuclear facilities; 3) Reduction of risk to the environment, public, and workers; 4) Shrinking the DOE legacy footprint.
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
Final Design for Thermal/Epithermal eXperiments (TEX) with Absorbers to Provide Validation Benchmarks for Y-12 Electrorefining Facility
One of the main goals of the Thermal/Epithermal eXperiments (TEX) project is to use existing Nuclear Criticality Safety Program (NCSP) assets to create critical experiment plutonium and uranium test beds for materials important to criticality safety that have insufficient benchmark evaluations. The plutonium test bed experiments were completed in 2018 and are published in the 2020 edition of the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook. The uranium test bed assemblies were measured in 2020, with benchmark preparation underway.
42 ENGINEERING↗
Criticality Safety at the Y-12 National Security Complex - UT NCS Course, Special Topics [Slides]
Abstract not provided.
61 RADIATION PROTECTION AND DOSIMETRY↗
LANL Today story Project Y badge photos
The National Security Research Center (NSRC) recently restored about 1,400 of its iconic badge photos from the Lab’s earliest days, stopping the deterioration of the photos and preserving valuable artifacts from Lab history. Now, the badge photos can be accessed online via the Lab’s external website.
99 GENERAL AND MISCELLANEOUS↗
Magnetic properties of Lu and Y doped Ce-Fe-B magnets
The growing demand for Nd2Fe14B magnets is exacerbating the current critical materials shortage. To reduce the amount of critical material in Nd2Fe14B magnets, chemical substitutions have been used and shown to improve the magnetic behavior, such as the Curie Temperature TC, anisotropy field Ha, and saturation magnetization MS.
Bretana, Alex↗