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Incites Analysis of DOE National Laboratories Data for: 1990-2015
This presentation analyzes the patterns of DOE, peer publications. The data received shows which labs are leading in total peer publications and which labs are leading in peer publications under each subject.
Infrastructure Investments in LAMDA: SEM Mill and Vault (NSUF 2019 Milestone Report)
This document summarizes the procurement, installation, and commissioning of a scanning electron microscope (SEM) mill produced by Fischione Instruments and a lead-shielded vault for specimen storage in support of Nuclear Science User Facility (NSUF) awards for use in Oak Ridge National Laboratory’s (ORNL) Low Activation Materials Development and Analysis (LAMDA) laboratory. The Model 1061 SEM mill is a tabletop ion milling system for advanced sample preparation of high-quality SEM samples. This device was chosen for its broad range of ion energies allowing for both rapid milling and final polishing of the sample surface. The purchase order with Fischione Instruments was released and awarded by ORNL procurement on September 11, 2018. The instrument was shipped in December of 2018 and was installed in the LAMDA laboratory in March of 2019. During the commissioning of this equipment, electron backscatter diffraction (EBSD) was performed on specimens before and after milling to show the enhanced surface quality. With the purchase of a lead vault dedicated to NSUF library materials co-located in the LAMDA laboratory, the NSUF program will be able to maintain a significant sample library in LAMDA. These specimens will be easily accessible for rapid turnaround experiment (RTE) awards and will reduce the overall cost of year-over-year storage and shipments to and from ORNL hot cell facilities. The contract to fabricate a fourth lead vault dedicated to NSUF specimen storage was awarded by ORNL procurement on August 10, 2018. Installation of the new vault was completed in January of 2019.
DevOps for Catalyst In Situ Visualization and Analysis at Sandia National Laboratories
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Trajectory Reconstruction and Uncertainty Analysis Using Mars Science Laboratory Pre-Flight Scale Model Aeroballistic Testing
As part of the Mars Science Laboratory (MSL) trajectory reconstruction effort at NASA Langley Research Center, free-flight aeroballistic experiments of instrumented MSL scale models was conducted at Aberdeen Proving Ground in Maryland. The models carried an inertial measurement unit (IMU) and a flush air data system (FADS) similar to the MSL Entry Atmospheric Data System (MEADS) that provided data types similar to those from the MSL entry. Multiple sources of redundant data were available, including tracking radar and on-board magnetometers. These experimental data enabled the testing and validation of the various tools and methodologies that will be used for MSL trajectory reconstruction. The aerodynamic parameters Mach number, angle of attack, and sideslip angle were estimated using minimum variance with a priori to combine the pressure data and pre-flight computational fluid dynamics (CFD) data. Both linear and non-linear pressure model terms were also estimated for each pressure transducer as a measure of the errors introduced by CFD and transducer calibration. Parameter uncertainties were estimated using a "consider parameters" approach.
Post-flight Analysis of Mars Science Laboratory Entry Aerothermal Environment and Thermal Protection System Response
The Mars Science Laboratory successfully landed on the Martian surface on August 5th, 2012. The rover was protected from the extreme heating environments of atmospheric entry by an ablative heatshield. This Phenolic Impregnated Carbon Ablator heatshield was instrumented with a suite of embedded thermocouples, isotherm sensors, and pressure transducers. The sensors monitored the in-depth ablator response, as well as the surface pressure at discrete locations throughout the hypersonic deceleration. This paper presents a comparison of the flight data with post-entry estimates. An assessment of the aerothermal environments, as well as the in-depth response of the heatshield material is made, and conclusions regarding the overall performance of the ablator at the suite locations are presented.
Consequence Analysis for Mars Science Laboratory Launch Safety Study.
Abstract Not Provided
Analysis of computational and laboratory shocked gas-curtain experiments
Abstract Not Provided
Analysis of computational and laboratory shocked gas-curtain experiments
Abstract Not Provided
Consequence Analysis for Mars Science Laboratory Launch Safety Study.
Abstract not provided.
Model Based Safety Analysis at Sandia National Laboratories.
Abstract not provided.
Systems Analysis at Sandia National Laboratories to Support National Security and Sustainability.
Abstract not provided.
Weathering in the Forelands of Two Rapidly Retreating Alpine Glaciers of Volcanic Bedrock in the Three Sisters, Oregon, USA
The glaciers of the Three Sisters volcanoes in Cascadia have retreated dramatically over the past century. In order to understand ongoing chemical weathering and solute transport in the proglacial valleys, waters were sampled from glacier outwash streams, local snowmelt, and proglacial springs and lakes at Collier and Diller Glaciers. To understand weathering and transport processes in the proglacial plains, infrared orbital remote sensing data was used to map compositional variability and highlight weathering products, which were then ground-truthed with laboratory mineralogical and chemical analyses of sediments. The hydrochemistry is significantly affected by a sub- and proglacial mafic weathering system lacking carbonate minerals. Here we report major ion concentrations in meltwaters for the summer 2016 and 2017 melt seasons. Total cation concentrations range from 3 to 250 μeq/l and dissolved bicarbonate concentrations range from 2 to 200 μeq/l. Other dissolved anions are negligible compared to bicarbonate. Dissolved silica concentrations range from 2 to 260 μmol/l, comparable to total dissolved cation concentrations. The highest cation and silica concentrations were measured in moraine-sourced springs. Compositional remote sensing analysis identified alteration zones in the proglacial plains at both Collier and Diller indicating potential hydrated silica. This analysis is consistent with laboratory analysis of sediment samples, which indicate the presence of poorly crystalline phases weathering products, including hydrated silica. Weathered materials are preferentially deposited on moraines due to aeolian and glacial transport, as well as intra-moraine alteration, and at abandoned stream terraces due to fluvial transport. Geochemical measurements indicate that the predominant form of chemical weathering in these periglacial mafic systems is the carbonation of feldspar as well as reactive volcanic glass. The presence of poorly crystalline silicates, as indicated by remote sensing datasets and laboratory analysis, is consistent with rapid weathering of feldspars and glass and formation of Fe-Al-Si-bearing mineraloids in these proglacial valleys. This weathering regime has wide-ranging implications for atmospheric CO2 drawdown due to cold-climate volcanic rock weathering.
Laboratory measurements and a theoretical analysis of the TCT fading channel radio system
This paper documents the laboratory and theoretical performance of a pilot-aided digital radio system. The technique considered transmits a midband pilot tone to improve the receiver data detection performance in a multipath fading channel and is referred to as the tone calibrated technique (TCT). The performance of a 860 MHz prototype system carrying 2.4 kbit/s data under Rician fading conditions is reported. Both experimental and analytical results show that the error floor experienced with nonpilot-aided transmission methods is effectively removed by the TCT scheme, resulting in significant performance gains at high signal-to-noise ratio values. The paper also examines the TCT system performance under typical operating conditions and presents a new analysis of the TCT theoretical error probability.
Pyrotechnic shock measurement and data analysis requirements
A study of laboratory measurement and analysis of pyrotechnic shock prompted by a discrepancy in preliminary Mariner Jupiter/Saturn shock test data is reported. It is shown that before generating shock response plots from any recorded pyrotechnic event, a complete review of each instrumentation and analysis system must be made. In addition, the frequency response capability of the tape recorder used should be as high as possible; the discrepancies in the above data were due to inadequate frequency response in the FM tape recorders. The slew rate of all conditioning amplifiers and input converters must be high enough to prevent signal distortion at maximum input voltage; amplifier ranges should be selected so that the input pulse is approximately 50% of full scale; the Bessel response type should be chosen for digital shock analysis if antialiasing filters are employed; and transducer selection must consider maximum acceleration limit, mounted resonance frequency, flat clean mounting surfaces, base bending sensitivity, and proper torque.