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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 1,621 records · Page 90
All sourcesNASA NTRSDOE OSTI
DOE OSTI2016

AmeriFlux US-SO4 Sky Oaks- New Stand

This is the AmeriFlux version of the carbon flux data for the site US-SO4 Sky Oaks- New Stand. Site Description - The Sky Oaks New site is located near the Sky Oaks Field station, owned and operated by San Diego State University. Chaparral vegetation, associated with a Mediterranean climate, covers nearly half of the rough and rocky terrain. Precipitation is almost exclusively confined to the winter months. During the summer and early fall, hot and dry Santa Ana winds from the northeast bring desert heat to the site. A high intensity natural wildfire occurred in approximately 1905. Physical characteristics prior to the 1905 burn are unknown, including stand age and canopy height. Currently, the Sky Oaks New site is an excellent representation of an old-growth chaparral ecosystem, with a canopy height of 2.3 m and chamise-dominated overstory.

Oechel, Walt↗
DOE OSTI2019

AmeriFlux US-HRC Humnoke Farm Rice Field - conventional

This is the AmeriFlux version of the carbon flux data for the site US-HRC Humnoke Farm Rice Field - conventional. Site Description - Conventional flood irrigation method on a rice field under continuous rice operation for 50 years

Reba, Michele L.↗
DOE OSTI2026

AmeriFlux FLUXNET-1F US-HRC Humnoke Farm Rice Field – Field C

This is the AmeriFlux Management Project (AMP) created FLUXNET-1F version of the carbon flux data for the site US-HRC Humnoke Farm Rice Field – Field C. This is the FLUXNET version of the carbon flux data for the site US-HRC Humnoke Farm Rice Field – Field C produced by applying the standard ONEFlux (1F) software. Site Description - Conventional flood irrigation method on a rice field under continuous rice operation for 50 years

Reba, Michele L. [USDA, ARS, DELTA WATER MANAGEMEN↗
DOE OSTI2025

Farnsworth Unit Gas Composition Analyses

This data set includes gas composition analyses that were provided to the Southwest Regional Partnership on Carbon Sequestration (SWP) by the operators of the Farnsworth Field Unit in Ochiltree County Texas.

CO2 CCUS,Farnsworth,Gas Compositions,Morrow Sandst↗
DOE OSTI2021

Development of Time Lapse VSP Integration Workflow: A Case Study at Farnsworth CO2-EOR Project

Abstract This study aims to develop a 4D Vertical Seismic Profile (VSP) integration workflow to improve the prediction of subsurface stress changes. The selected study site is a 5-spot pattern within the ongoing CO2-EOR operations at the Farnsworth Field Unit FWU in Ochiltree County, Texas. The specific pattern has undergone extensive geological and geomechanical characterization through the acquisition of 3D seismic data, geophysical well logs, and core. This workflow constrains a numerical hydromechanical model by applying a penalty function formed between "modeled" versus "observed" time-lapse compressional and shear seismic velocity changes. Analyses of geophysical logs and ultra-sonic measurements on core exhibit measurable sensitivities to changes in both fluid saturation and mean effective stress. These data are used to develop a site-specific rock physics model and stress-velocity relationship, which inform the numerical models used to generate the "modeled" portion of the penalty function. The "observed" portion of the penalty function is provided by a novel elastic full-waveform inversion of the available 3D baseline and three monitor surveys to produce high-quality estimates of time-lapse compressional and shear seismic velocity changes. The modeling workflow accounts sequentially for fluid substitution and stress impacts. Hydrodynamic and geomechanical properties of the 3D coupled numerical model are estimated through geostatistical integration of well log and core data with 3D seismic inversion products. Changes in seismic velocities due to fluid substitution are computed using the Biot-Gassmann workflow and site-specific rock physics. Stress impacts on time-lapse seismic velocity changes are modeled from the effective stress output of the hydromechanical model and are initially based on the velocity versus effective stress relationship extracted from core mechanical testing. Based on the principle of superposition of seismic wavefields, seismic velocity changes attributed to fluid substitution and that due to changes in mean effective stress are treated as linearly additive. The modeled results are upscaled using Backus averaging to reconcile scale discrepancies between the modeled and measured datasets to formulate the penalty function. This manuscript presents the forward modeling process and concludes that for the base case, the seismic velocity changes due to mean effective stress dominates over the seismic velocity changes attributed to fluid substitution because of the extensive range of the pressure perturbations. Successful minimization of this penalty function calibrates the coupled hydrodynamic geomechanical numerical model and affirms the suitability of acoustic time-lapse measurements such as 4D-VSP for geomechanical calibration.

02 PETROLEUM↗
DOE OSTI2012

REBCO coated conductor cables for fusion magnets - Final Report

The feasibility for fusion as a practical energy source needs to be enhanced significantly by removing some of the restrictions that low -- temperature superconductors (LTS) put on the fusion magnet systems. One method to simplify the magnet system is by using high -- temperature superconductors (HTS) that allow for much larger temperature margins, a higher magnet performance and much less mechanical degradation in the superconductor during operation. For use in fusion magnets, HTS need to be bundled into high -- current cables that can be operated at high magnetic fields and at high current ramp rates, while experiencing a homogenous current distribution.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2012

AmeriFlux Measurement Network: Science Team Research

Research involves analysis and field direction of AmeriFlux operations, and the PI provides scientific leadership of the AmeriFlux network. Activities include the coordination and quality assurance of measurements across AmeriFlux network sites, synthesis of results across the network, organizing and supporting the annual Science Team Meeting, and communicating AmeriFlux results to the scientific community and other users. Objectives of measurement research include (i) coordination of flux and biometric measurement protocols (ii) timely data delivery to the Carbon Dioxide Information and Analysis Center (CDIAC); and (iii) assurance of data quality of flux and ecosystem measurements contributed by AmeriFlux sites. Objectives of integration and synthesis activities include (i) integration of site data into network-wide synthesis products; and (ii) participation in the analysis, modeling and interpretation of network data products. Communications objectives include (i) organizing an annual meeting of AmeriFlux investigators for reporting annual flux measurements and exchanging scientific information on ecosystem carbon budgets; (ii) developing focused topics for analysis and publication; and (iii) developing data reporting protocols in support of AmeriFlux network goals.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2013

T1044: sPHENIX Calorimetry Tests

The sPHENIX upgrade to the PHENIX detector is designed to study jets in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and address questions about the nature of the perfect fluid quark-gluon plasma. The upgrade consists of a 2 Tesla superconducting magnetic solenoid of radius 70 cm surrounded by electromagnetic and hadronic calorimeters with uniform coverage over a rapidity range of IT'ii < 1 and 2n in azimuth. The sPHENIX detector concept takes advantage of technological developments to enable a compact design with excellent performance. A tungsten-scintillator electromagnetic calorimeter read out with silicon photomultipliers (SiPMs) allows for a physically thin device, which can operate in a magnetic field, without the bulk of photomultiplier tubes and the need for high voltage distribution. The smaller electromagnetic calorimeter also allows the hadron calorimeter to be less massive, and the use of silicon photomultipliers for the hadron calorimeter allow for nearly identical electronic readout for the two major systems. The requirements for the sPHENIX electromagnetic calorimeter lead to a design that is compact (i.e. has a small Molie 're radius and short radiation length), has a high degree of segmentation (0.024 x 0.024 in TJ and

Mannel, Eric↗
DOE OSTI2014

New-Generation Thermal Neutron Detectors and Electronics for High-Count-Rate Applications

Neutron measurements are important in many nonproliferation and treaty verification applications. Helium-3 proportional counters and analog electronics are the backbone of neutron detection systems. Helium-3 tubes with a 1-in. diameter have been used with classical electronics for over three decades because of the almost ideal behavior of the 3 He tube as a neutron detector. However, some demanding applications of 3 He tubes (high gamma dose rate, high count rate) and the use of non-ideal detectors (such as 10 B-lined proportional counters) mean that the limitations of these conventional systems are being reached. For example, neutron multiplicity deadtime corrections can be large, and some applications have had trouble with multiple pulsing. Also, instrumentation designs for spent fuel applications often rely on large amounts of lead shielding to reduce the gamma dose at the detector location, making them heavy and expensive. This major challenge for a short dead time and operation in high gamma fields is difficult to address by simply changing the gas admixture and tweaking the shaper time constants. Those small gains are adequate for measurements of some lower-burn-up, low-enrichment-uranium spent fuel assemblies, but not for mixed oxide (MOX) fuel or advanced fast reactor fuel, where the neutron source term is greater.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2014

Quantification of Wellbore Leakage Risk Using Non-destructive Borehole Logging Techniques

Well integrity is important at all potential CCS locations and may play a crucial role establishing leakage risk in areas where there is a high density of existing wells that could be impacted by the storage operations including depleted petroleum fields where EOR or CCS will occur. To address a need for risk quantification methods that can be directly applied to individual wells using borehole logging tools a study was conducted using data from five wells in Wyoming. The objectives of the study were: Objective 1: Develop methods to establish the baseline flow parameters (porosity and permeability or mobility) from individual measurements of the material properties and defects in a well. Objective 2: Develop a correlation between field flow-property data and cement logs that can be used to establish the flow-properties of well materials and well features using cement mapping tools. Objective 3: Establish a method that uses the flow-property model (Objective 2) to analyze the statistical uncertainties associated with individual well leakage that can provide basis for uncertainty in risk calculations. The project objectives were met through the logging of five wells in Carbon and Natrona County Wyoming to collect data that was used to estimate individual and average well flow properties and model the results using ultrasonic data collected during the logging. Three of the five wells provided data on point and average flow properties for well annuli. Data from the other two wells were used to create models of cement permeability and test whether information collected in one well could be used to characterize another well. The results of the in-situ point measurements were confirmed by the lab measurements sidewall cores collected near the same depths Objective 1 was met using the data collected through logging, testing, and sampling. The methods were developed that can establish baseline flow parameters of wells by both point and average test methods. The methods to estimate the flow properties modeling of point pressure tests, modeling of vertical interference tests, and laboratory measurement of cased-hole sidewall cores The wells were in sufficiently good shape to allow the development of the characterization methods while still having enough defects to study differences in results as they relate to well integrity. Samples and tests analyzed from three of five wells studied in showed the cements were largely intact and had not degraded from exposure native brines. Log results taken in conjunction with the core measurements indicate that interfaces and/or problems with cement placement due to eccentering provide preferential flow paths for fluids, which can increase the effective permeability of the barrier several orders of magnitude above the permeability of intact cement. The results of the maps created using logging tools indicating that the cement condition and bond are generally good identify a need for more research to understand how logs can be used to predicteffective well permeabilities such as those measured by the VITs in this study.

42 ENGINEERING↗
DOE OSTI2015

Power Performance Test Report for the U.S. Department of Energy 1.5-Megawatt Wind Turbine

The U.S. Department of Energy (DOE) acquired and installed a 1.5-megawatt (MW) wind turbine at the National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory (NREL). This turbine (hereafter referred to as the DOE 1.5) is envisioned to become an integral part of the research initiatives for the DOE Wind Program, such as Atmosphere to Electrons (A2e). A2e is a multiyear DOE research initiative targeting significant reductions in the cost of wind energy through an improved understanding of the complex physics governing wind flow into and through wind farms. For more information, visit http://energy.gov/eere/wind/atmosphere-electrons. To validate new and existing high-fidelity simulations, A2e must deploy several experimental measurement campaigns across different scales. Proposed experiments include wind tunnel tests, scaled field tests, and large field measurement campaigns at operating wind plants. Data of interest includes long-term atmospheric data sets, wind plant inflow, intra-wind plant flows (e.g., wakes), and rotor loads measurements. It is expected that new, high-fidelity instrumentation will be required to successfully collect data at the resolutions required to validate the high-fidelity simulations.

17 WIND ENERGY↗
DOE OSTI2015

Power Quality Test Report for the U.S. Department of Energy 1.5-Megawatt Wind Turbine

The U.S. Department of Energy (DOE) acquired and installed a 1.5-megawatt (MW) wind turbine at the National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory. This turbine (hereafter referred to as the DOE 1.5) is envisioned to become an integral part of the research initiatives for the DOE Wind Program, such as Atmosphere to Electrons (A2e). A2e is a multiyear DOE research initiative targeting significant reductions in the cost of wind energy through an improved understanding of the complex physics governing wind flow into and through wind farms. For more information, visit http://energy.gov/eere/wind/atmosphere-electrons. To validate new and existing high-fidelity simulations, A2e must deploy several experimental measurement campaigns across different scales. Proposed experiments include wind tunnel tests, scaled field tests, and large field measurement campaigns at operating wind plants. Data of interest includes long-term atmospheric data sets, wind plant inflow, intra-wind plant flows (e.g., wakes), and rotor loads measurements. It is expected that new, high-fidelity instrumentation will be required to successfully collect data at the resolutions required to validate the high-fidelity simulations.

17 WIND ENERGY↗
DOE OSTI2017

DEAL annual report.

The digital electronics at the atomic limit (DEAL) project seeks to leverage Sandia's atomic-precision fabrication capability to realize the theorized orders-of-magnitude improvement in operating voltage for tunnel field effect transistors (TFETs) compared to CMOS. Not only are low-power digital circuits a critical element of many national security systems (e.g. satellites), TFETs can perform circuit functions inaccessible to CMOS (e.g. polymorphism).

99 GENERAL AND MISCELLANEOUS↗
DOE OSTI2018

Maintenance Plan for the Composite Analysis of the Hanford Site, Southeast Washington.

The U.S. Department of Energy (DOE) manuals for radioactive waste management, DOE M 435.1-1 Chg 21 and DOE-STD-5002-2017, require that the Hanford Site maintain site performance assessments and composite analyses (CAs). This document describes the plan for maintaining the CA that supports waste disposal and remedial actions for the Hanford Site. An initial CA of the site was issued in 1998, conditionally approved in 1999, received further analysis to satisfy conditions in an addendum in 2001, and was approved in 2002. This document meets the maintenance plan requirements described in DOE M 435.1-1 Chg 2 and DOE-STD-5002-2017 and implements the requirements of the disposal authorization related to the CA for the U.S. Department of Energy, Richland Operations Office, the responsible field office, and its contractors.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2019

Maintenance Plan for the Composite Analysis of the Hanford Site, Southeast Washington

The U.S. Department of Energy (DOE) manuals for radioactive waste management, DOE M 435.1-1 Chg 2 and DOE-STD-5002-2017, require that the Hanford Site maintain site performance assessments and composite analyses (CAs). This document describes the plan for maintaining the CA that supports waste disposal and remedial actions for the Hanford Site. An initial CA of the site was issued in 1998, conditionally approved in 1999, received further analysis to satisfy conditions in an addendum in 2001, and was approved in 2002. This document meets the maintenance plan requirements described in DOE M 435.1-1 Chg 2 and DOE-STD-5002-2017 and implements the requirements of the disposal authorization related to the CA for the U.S. Department of Energy, Richland Operations Office, the responsible field Office, and its contractors. In addition to providing current plans for revisions to the CA, this maintenance plan describes the work expected to be completed for ongoing reviews of new information; data related to residual sources of radioactive material, land use, and monitoring; and research and development related activities being conducted at the Hanford Site and within other U.S. Department of Energy programs. The main emphasis of this maintenance plan is to identify additional data and information to support the next revision of the Hanford Site CA. Improvements are expected regarding the knowledge of waste characterization and inventory, site-specific geotechnical data, and final disposition of major disposal facilities and waste sites.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2019

On the calculation of parton distributions from Lattice QCD

A new method for calculating parton distribution functions from lattice QCD is implemented and studied. Lattice QCD calculable matrix elements with space-like separated fields have an analogous operator product expansion to experimental scattering cross sections and thus these matrix elements are known as “Good Lattice Cross Sections”. Using the colinear factorization approach, a Good Lattice Cross Section can be factorized to the short distance matching kernels that are computed in perturbation theory and the non-perturbative parton distribution functions. As a result, using the perturbative matching kernels and the non-perturbatively computed matrix elements, one can obtain the parton distribution functions. The nucleon and pion matrix elements are determined on a set of 2+1 flavors of clover improved quarks with heavier than physical pion mass. The determination of the parton distributions from Good Lattice Cross Sections constitutes an ill-posed inverse problem. Methods for accurate determination of parton distributions from the Good Lattice Cross Sections are studied. With the calculation of several Good Lattice Cross Sections, the determination of the parton distributions can be improved with a simultaneous analysis, similar to the global parton distribution fits to experimental cross sections.

Karpie, Joseph↗
DOE OSTI2019

Record Fast-Cycling Accelerator Magnet Based on High-Temperature Superconductor [Poster]

We report on the prototype high temperature superconductor (HTS) based accelerator magnet capable to operate at 12 T/sB field ramping rate with a very low cryogenic power loss thus indicating a possibility of its application for the accelerators requiring high repetition rate and high average beam power. Further details of design, construction and test arrangement of this prototype rapid-cycling HTS based magnet are presented. The measured cryogenic power loss limit in the magnet power test is discussed in terms of the feasibility of application of such a magnet for construction of a dual proton beam booster accelerator.

43 PARTICLE ACCELERATORS↗