Assessing the tension between a black hole dominated early universe and leptogenesis
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
SEARCH · Engineering Papers
Results for “University”
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.
Halo formation from Yukawa forces in the very early Universe
If long-range attractive forces exist and are stronger than gravity then cosmic halo formation can begin in the radiation-dominated era. We study a simple realization of this effect in a system where dark matter fermions have Yukawa interactions mediated by scalar particles, analogous to the Higgs boson in the standard model. We develop a self-consistent description of the system including exact background dynamics of the scalar field, and precise modeling of the fermion density fluctuations. For the latter, we provide accurate approximations for the linear growth as well as quantitative modeling of the nonlinear evolution using N-body simulations. We find that halo formation occurs exponentially fast and on scales substantially larger than simple estimates predict. Here, the final fate of these halos remains uncertain, but could be annihilation, dark stars, primordial black holes, or even the existence of galaxy-sized halos at matter-radiation equality. More generally, our results demonstrate the importance of mapping scalar-mediated interactions onto structure formation outcomes and constraints for beyond the standard model theories.
79 ASTRONOMY AND ASTROPHYSICS↗
High-Power Design Challenges for Differential-Mode EV Universal Battery Supercharger
Not Available
42 ENGINEERING↗
Acoustic Doppler Velocimeter (ADV) data from the University of New Hampshire Atlantic Marine Energy Center (UNH-AMEC ) Tidal Energy Test Site during a Perigean Spring Tide
The ADV measurements contained in this submission were taken on the floating turbine deployment platform (TDP) located at the Memorial Bridge in Portsmouth, NH. The measurements were conducted 11/4/2021-11/9/2021 with the fastest currents occurring on 11/7/2021. Along with the submission of ADV data, a .ppt and text document further explaining the ADV deployment location is included.
16 TIDAL AND WAVE POWER↗
Universal Utility Data Exchange (UUDEX) Information Structures - Rev. 1
This report summarizes the data structures developed for the demonstration version of UUDEX. They serve as an initial proposal for data structures to be proposed for standardization.
97 MATHEMATICS AND COMPUTING↗
University Contributions to the Versatile Test Reactor (VTR) (FY2022) (Book of Abstracts)
Students were an integral part of the work done on the Versatile Test Reactor (VTR) this fiscal year (FY). In fact, these students participated in the research, development, and deployment of technologies needed to move the design of advanced experimental vehicles forward. This document summarizes the work performed by these students in several areas, including the Extended Length Test Assembly (ELTA)-Sodium-cooled Fast Reactor (SFR); ELTA-Molten Salt Reactor (MSR); ELTA- Lead/lead-bismuth cooled Fast Reactor (LFA); ELTAGas-cooled Fast Reactor (GFR); ELTA-Materials (M); and Cross-Cutting Technologies areas.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
AWAKEN Site A1 Lidar (Cornell University) / Processed Data
This dataset contains data from the ground-based HALO Streamline XR lidar at site A1 arc and VAD scans, as well as 6-beam scans and vertical stares. Overlapping range gates are used.
17 WIND ENERGY↗
AWAKEN Site H Lidar (Cornell University) / Processed Data
This dataset contains data from the ground-based HALO Streamline XR lidar at site H arc and VAD scans, as well as 6-beam scans and vertical stares. Overlapping range gates are used.
17 WIND ENERGY↗
AWAKEN Site H Lidar (Cornell University) / Derived Data - High-Frequency Wind Profiles
Wind profiles from ground-based Doppler lidar at site H were calculated for each 6-beam profiling scan (one point every ~20 s). The wind speed retrieval uses the Sathe et al., 2015, paper in the references.
17 WIND ENERGY↗
AWAKEN Site A1 Lidar (Cornell University) / Derived Data - High-Frequency Wind Profiles
Wind profiles from ground-based Doppler lidar at site A1 were calculated for each 6-beam profiling scan (one point every ~20 s). The wind speed retrieval uses a modified version of the Sathe et al., 2015, paper in the references.
17 WIND ENERGY↗
AWAKEN Site A1 LiDAR (Cornell University) / Derived Data - Wind Statistics
The 10-minute wind statistics from the ground-based Doppler lidar at site A1 were calculated using a modified version of the Sathe et al., 2015 paper in the references.
17 WIND ENERGY↗
Reconstructing the Universe: Testing the Mutual Consistency of the Pantheon and SDSS/eBOSS BAO Data Sets with Gaussian Processes
We test the mutual consistency between the baryon acoustic oscillation measurements from the eBOSS SDSS final release and the Pantheon supernova compilation in a model-independent fashion using Gaussian process regression. We also test their joint consistency with the ΛCDM model in a model-independent fashion. We also use Gaussian process regression to reconstruct the expansion history that is preferred by these two data sets. While this methodology finds no significant preference for model flexibility beyond ΛCDM, we are able to generate a number of reconstructed expansion histories that fit the data better than the best-fit ΛCDM model. These example expansion histories may point the way toward modifications to ΛCDM. We also constrain the parameters Ω{sub k} and H {sub 0} r {sub d} both with ΛCDM and with Gaussian process regression. We find that H {sub 0} r {sub d} = 10,030 ± 130 km s{sup −1} and Ω{sub k} = 0.05 ± 0.10 for ΛCDM and that H {sub 0} r {sub d} = 10,040 ± 140 km s{sup −1} and Ω{sub k} = 0.02 ± 0.20 for the Gaussian process case.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Continuous Filament Network of the Local Universe
Simulated galaxy distributions are suitable for developing filament detection algorithms. However, samples of observed galaxies, being of limited size, cause difficulties that lead to a discontinuous distribution of filaments. We created a new galaxy filament catalog composed of a continuous cosmic web with no lone filaments. The core of our approach is a ridge filter used within the framework of image analysis. We considered galaxies from the HyperLeda database with redshifts 0.02 ≤ z ≤ 0.1, and in the solid angle 120° ≤ R.A. ≤ 240°, 0° ≤ decl. ≤ 60°. We divided the sample into 16 two-dimensional celestial projections with redshift bin Δ z = 0.005, and compared our continuous filament network with a similar recent catalog covering the same region of the sky. We tested our catalog on two application scenarios. First, we compared the distributions of the distances to the nearest filament of various astrophysical sources (Seyfert galaxies and other active galactic nuclei, radio galaxies, low-surface-brightness galaxies, and dwarf galaxies), and found that all source types trace the filaments well, with no systematic differences. Next, among the HyperLeda galaxies, we investigated the dependence of the g - r color distribution on the distance to the nearest filament, and confirmed that early-type galaxies are located on average further from the filaments than late-type ones.
79 ASTRONOMY AND ASTROPHYSICS↗
Ongoing Data Platform Development for High-Temperature Gas-cooled Reactor (HTGR) Thermal-Fluid Experiments Supported by Nuclear Energy University Program (NEUP) [Presentation Slides]
There are in total 30NEUP projects focusing on the thermal-fluid experiments related with High-Temperature Gas-cooled Reactor (HTGR) from FY2009 to FY2021, producing a large amount of high-quality validation data, however, these valuable data has been scattering everywhere and not been disseminated to the community well, and final reports are available only from OSTI webpage. This could potentially be a huge waste, not only for government budget but also for the HTGR research community. To improve access to this HTGR validation data and optimize the return on the significant investment made by DOE and supported by the Advanced Reactor Technologies (ART) Gas-Cooled Reactor (GCR) program, we conducted a survey to assess completed and ongoing HTGR NEUP projects with the aim to develop a public-access data platform that can be used to retrieve code validation data and guide future NEUP investments.
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
Alabama A&M University Senior Project
This entry is being conducted in order to review documents (drawings and pictures) necessary for senior students of Alabama A&M to conduct their senior project. This project will include helping design an upgraded operating system for the TREAT core clamping units.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
Alabama A&M University Senior Project Cont'd
This entry is being conducted in order to review documents (drawings and pictures) necessary for senior students of Alabama A&M to conduct their senior project. This project will include helping design an upgraded operating system for the TREAT core clamping units. A previous has been completed for the project per STI # INL/MIS-22-69603 Rev:000, these additional items will further assist the students in there work.
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS↗
RAPIDS-2: a SciDAC Institute for Resource and Application Productivity through Computation, Information, and Data Science Final Report (University of Oregon)
Final report
Malony, Allen D. [University of Oregon] (ORCID:000↗
Unravelling the Role of Electron Acceptors for the Universal Enhancement of Charge Transport in Quinoid-Donor-Acceptor Polymers for High-Performance Transistors
The quinoid-donor-acceptor (Q-D-A) strategy has recently emerged as a promising approach for constructing high mobility semiconducting polymers. In order to fully explore the potential of this strategy in improving the charge transport and elucidating the structure-property-performance relationships in Q-D-A polymers, a series of new polymers with different electron acceptor units and backbone coplanarity have been synthesized and characterized. In this work, all of the resulting Q-D-A polymers exhibit much more planar backbone conformations in comparison to their donor-acceptor (D-A) counterparts. Moreover, organic field-effect transistors based on Q-D-A polymers exhibit excellent effective hole mobilities in a range of 0.44 to 3.35 cm 2 V –1 s –1 , most of which are orders of magnitude higher than those of their corresponding D-A polymers. Notably, the hole mobility of 3.35 cm 2 V –1 s –1 is among the highest for the quinoidal-aromatic polymers characterized by conventional spin-coating methods. Furthermore, the role of electron acceptors in Q-D-A polymers has been comprehensively investigated. Polymers with stronger acceptor units are more inclined to deliver edge-on lamellas, high film crystallinity, small effective hole masses, and decent operational stability. The detailed structure-property-device performance relationship will pave the way toward high performance semiconducting polymers using the potent Q-D-A strategy.
36 MATERIALS SCIENCE↗