NASA Scientific and Technical Aerospace Reports

(IPD) program, and the Hybrid Sounding Rocket (HYSR), Stennis Space Center (SSC) continues to be a premier location for
conducting large-scale propulsion testing. Central to each test program is the capability for sensor systems to deliver reliable
measurements and high quality data, while also providing a means to monitor the test stand area to the highest degree of safety
and sustainability. As part of an on-going effort to enhance the testing capabilities of Stennis Space Center, the Test Technology
and Development group is developing and applying a number of wireless and intelligent sensor technologies in ways that are
new to the test existing test environment.
Derived from text
Wireless Communication; Sensors; Spacecraft Propulsion; Technology Utilization; Engine Tests; Rocket Engine Design
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CHEMISTRY AND MATERIALS (GENERAL)
Includes general research topics related to the composition, properties, structure, and use of chemical compounds and materials as they
relate to aircraft, launch vehicles, and spacecraft. For specific topics in chemistry and materials see categories 25 through 29. For
astrochemistry see category 90 Astrophysics.
20040068275 Lawrence Livermore National Lab., Livermore, CA
Electrical Impedance Tomography at the A-014 Outfall for Detection of DNAPL
Daily, W.; Ramirez, A.; May 28, 2003; In English
Report No.(s): DE2003-15004881; UCRL-ID-153535; No Copyright; Avail: National Technical Information Service (NTIS)
Some laboratory studies have shown that the low frequency electrical properties of some soil minerals contaminated by
dense non-aqueous phase liquid (DNAPL) may be sufficiently unique to make it possible to use electrical impedance
tomography (EIT) to differentiate normal electrical heterogeneities of the subsurface from DNAPL contamination. The goal
of this work is to determine if electrical impedance measurements of the soil and groundwater at a contaminated site can be
used to detect the presence and map the distribution of DNAPL.
NTIS
Tomography; Electrical Impedance; Low Frequencies
20040068279 Lawrence Livermore National Lab., Livermore, CA
Porous Silicon Coated With Ultrathin Diamond-Like Carbon Film Cathodes
Evtukh, A. A.; Litovchenko, V. G.; Litvin, Y. M.; Fedin, D. V.; Rassamakin, Y. V.; Apr. 01, 2001; In English
Report No.(s): DE2003-15004781; UCRL-JC-143779; No Copyright; Avail: National Technical Information Service (NTIS)
The main requirements to electron field emission cathodes are their efficiency, stability and uniformity. In this work we
combined the properties of porous silicon layers and diamond-like carbon (DLC) film to obtain emission cathodes with
improved parameters. The layered structures of porous silicon and DLC film were formed both on flat n-Si surface and silicon
tips created by chemical etching. The conditions of the anodic and stain etching of silicon in HF containing solution under
the illumination have been widely changed. The influence of thin (less than or equal to 10nm) DLC film coating of the porous
silicon layer on electron emission has been investigated. The parameters of emission efficiency such as field enhancement
coefficient, effective emission areas and threshold voltages have been estimated from current-voltage dependencies to compare
and characterize different layered structures. The improvement of the emission efficiency of silicon tip arrays with porous
layers coated with thin DLC film has been observed. These silicon-based structures are promising for flat panel display
applications.
NTIS
Coatings; Porous Silicon; Thin Films; Diamond Films; Carbon; Cathodes
20040068286 Lawrence Livermore National Lab., Livermore, CA
Science and Technology Review: National Ignition Facility Comes to Life
Sep. 2003; In English
Report No.(s): DE2003-15004864; No Copyright; Avail: National Technical Information Service (NTIS)
This issue covers the following articles: (1) ‘The National Ignition Facility Is Born’; (2) ‘The National Ignition Facility
Comes to Life’- Over the last 15 years, thousands of Livermore engineers, scientists, and technicians as well as hundreds of
industrial partners have worked to bring the National Ignition Facility into being; (3) ‘Tracking the Activity of Bacteria
Underground’ - Using real-time polymerase chain reaction and liquid chromatography/tandem mass spectrometry, researchers
at Livermore are gaining knowledge on how bacteria work underground to break down compounds of environmental concern;
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