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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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Technology Development for NASA's Space Interferometry Mission (SIM) and Future More Ambitious Space Based Optical and Infrared Interferometers
Optical and infrared interferometers will open new vistas for astronomy over the next decade.
Evaluating intragrain gradients in the δ34S of pyrite using a 7f-GEO SIMS
Not Available
Detecting Trace Boron Doped in Tungsten Plates Using ToF-SIMS, Raman, and SEM
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Interfacial GaOx in Al2O3/n-GaN MOS structures studied by quasi-static CV and ToF-SIMS
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Interfacial oxide and other species in trimethylaluminum-pretreated atomic layer deposition-Al 2 O 3 /GaN characterized by sputter-assisted ToF-SIMS
Deposition techniques, like atomic layer deposition (ALD), are used to form high-quality dielectrics for GaN-based metal–oxide–semiconductor (MOS) gate structures due to the lack of a reliable thermal oxide in GaN. Moreover, interfacial GaO x from pre-existing native oxides is thought to adversely impact channel carrier dynamics and induce undesired threshold voltage shifts in GaN-based MOS gate structures. Exposure of the GaN surface to the trimethylaluminum (TMA) precursor prior to standard alumina ALD decreases the native oxide layer on GaN, but the extent of chemical modification has not been well studied in the context of interface composition in a MOS gate structure. Herein, we compare annealed 55 nm Al 2 O 3 dielectric films on GaN grown using either a water-first ALD process or a process including sequential pulses of TMA immediately before the initiation of Al 2 O 3 ALD. Time-of-Flight Secondary Ion Mass Spectrometry measures differences in the interfacial GaO x content between each ALD film. Here, it also detects surface contaminant species like Si, F, S, and C. Furthermore, we report the formation of an AlN species at the Al 2 O 3 /GaN interface, which is more prominent for the film grown using the TMA pre-pulse step. In general, this work demonstrates that the TMA pre-pulse step is an effective strategy for cleaning substrate surfaces prior to ALD.
Inspection of next generation EUV resists with nano-projectile SIMS
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WEC-Sim v6.1 Updates
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Meas. & Sim. Organic Scintillator Rossi-alpha for Kilogram-quantity HEU [Poster]
Abstract not provided.
SIMS U‐Pb dating of micro‐zircons in the lunar meteorites Dhofar 1528 and Dhofar 1627
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Some observations during weightlessness sim- ulation with subject immersed in a rotating water tank
Observations during weightlessness simulation with subject immersed in rotating water tank
Candidate configuration trade study, Stellar-Inertial Measurement System (SIMS) for an Earth Observation Satellite (EOS), addendum
Results are given of an investigation of the effects of spacecraft orbital ephemeris and attitude errors on the ability to determine the locations of unknown landmarks with respect to known landmarks in the payload sensor imagery.
SIMS prototype system 1: Design data brochure
A prototype solar heating and hot water system using air as the collector fluid and a pebble bed for heat storage was designed for installation into a single family dwelling. The system, subsystem, and installation requirements are described. System operation and performance are discussed, and procedures for sizing the system to a specific site are presented.
Installation package - SIMS prototype system 1A
This report consists of details for the installation, operation and maintenance of a prototype heating and hot water system, designed for residential or light commercial applications. This system consists of the following subsystems: air type collectors, pebble bed thermal storage, air handling unit, air to water heat exchanger, hot water preheat tank, auxiliary energy, ducting system.
Sims Prototype System 2 test results: Engineering analysis
The testing, problems encountered, and the results and conclusions obtained from tests performed on the IBM Prototype System, 2, solar hot water system, at the Marshall Space Flight Center Solar Test Facility was described. System 2 is a liquid, non draining solar energy system for supplying domestic hot water to single residences. The system consists of collectors, storage tank, heat exchanger, pumps and associated plumbing and controls.