SEARCH · Engineering Papers
Results for “INDEXES”
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.
NCR Risk Project: A first look at the Risk Index [Slides]
Abstract not provided.
Shock Tube Index of Refraction Measurements using a Quadrature Fringe Imaging Interferometer.
Abstract not provided.
Index of Classified Reports Collection now available Vital resource for Weapons researchers, today’s mission work
The collection is made up of classified technical reports containing weapons data dating back to the start of the nuclear security enterprise. The information is compiled into reports, slides, handbooks and literature. It originated from Los Alamos, Lawrence Livermore, and Sandia Labs, as well as from the Department of Defense and likely every other organization involved in nuclear testing, including contractors and those that are now defunct.
Optical Diagnostic for Index of Refraction Measurements Across Shock Waves.
Abstract not provided.
Detecting changepoints in globally-indexed functional data
Explore the source record for details and available documents.
Detecting changepoints in globally-indexed functional time series
Explore the source record for details and available documents.
Detecting changepoints in globally-indexed functional time series
Explore the source record for details and available documents.
Adjusting VCSEL wavelength and index by etching and regrowth
Explore the source record for details and available documents.
Elastic Changepoint Detection for Globally-indexed Functional Time Series Data with Climate Applications
Changepoint detection is a vital tool in the application of climate data analysis. Numerous types of climate observation data are most properly represented by functional time series, implying a need for accurate changepoint detection methods applicable to functional time series data. Such data taken at a global scale often contain both spatial heterogeneity and dependence as well as phase (time) misalignment. In this report, we present methods which can detect spatially-dependent changepoints while allowing different estimates of change time and change strength depending on location. Additionally, we provide extensions to this spatially-predicted model which controls for phase variability among observations. Our methods provide the ability to detect a single change, or control for epidemic changes (where a “return-to-normal” change is more likely to be detected than the initial change). We showcase results analyzing the June 1991 eruption of Mt. Pinatubo, where our methods demonstrate the ability to accurately detect both single and epidemic changepoints even in the presence of strong seasonal variability. We find that our spatially-predicted model improves the detection of relevant changepoints versus methods which do not take spatial information into account, and we find that controlling for phase variability helps to control the false discovery rate during the detection process.
Frequency Security Index-Based State of Health Monitoring of a Microgrid using Energy Storage Systems
Explore the source record for details and available documents.
Extension of SCALE/Sampler’s sensitivity index for the assessment of cross section, fission yield, and decay data uncertainties
Accurate prediction of nuclide compositions and neutron and gamma sources and spectra for fresh and spent nuclear fuel through computational modeling and simulations is the basis for safeguards instruments design, optimization, and calibration, and for validation of the measured responses. The accuracy of these simulations can be significantly impacted by uncertainties in input parameters to the applied computer code. Input parameters are, for example, dimensions, material compositions, and temperatures of the model. Additionally, important but sometimes neglected input parameters for simulations of nuclear systems are the nuclear data that include nuclear reaction cross sections, fission product yields, and decay data. It has been shown that uncertainties of calculated results are dominated by uncertainties of these nuclear data.
Refractive Index Measurements of Organic Scintillators for Particle Transport Simulations
Explore the source record for details and available documents.
RhizoGrid Indexed Sorghum Rhizosphere Multi-Omics
PerCon SFA project data dentification of spatially resolved biomarkers of drought in Sorghum bicolor rhizosphere molecular-microbe interactions using a novel root cartography "RhizoGrid" system for sampling plants under drought and control conditions across 10 equally sized root zone environments (4 quadrants each). Each quadrant was sampled and processed for 16S amplicon, metabolomics, and X-ray computed tomography (XCT). Data download includes experimental metadata and results files for 16S rRNA sequence analysis of microbial community assembly (processed data files), liquid chromatography mass spectrometry (LC-MS) metabolomics analysis of microbial community root exudates (processed data files), X-ray computed tomography (XCT) spatial gradient analysis (raw and processed data files) of microbial community composition, and related computational modeling outputs.
Creating a genome-wide sequence-indexed collection of grass mutants
Explore the source record for details and available documents.
Expanded Capabilities of Internal Boring Tools with Indexable Inserts
The design of tools with adjustable geometry is analyzed. A design is proposed for a boring tool with a replaceable polyhedral insert in which the lead angle may be varied. This design permits the machining of blind and through holes in the workpiece with the same cutter.
Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio
These data from observations of sunspot activity cover the period 1875 through 1981; reconstructions are possible back to 1832. Available sunspot models and the theory of mixing length indicate that the observed changes in the umbral/penumbral (U/P) ratio may be equivalent to changes in the solar constant. The U/P ratio is calculated from measurements of solar activity and has been shown to be in good agreement with the Northern Hemisphere temperature record. The data consist of year, number of sunspot groups, Wolf sunspot number, umbra area, whole area, penumbral area, and umbral/penumbral ratio. The data are in one file (3.3 kB).For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp014.html