NASA Scientific and Technical Aerospace Reports

of the NMOS transistors with an n-channel MFSFET. The gate of the MFSFET is connected to a polling voltage pulse instead
of the other NMOS transistor drain. The polling voltage pulses are of sufficient magnitude to saturate the ferroelectric gate
material and force the MFSFET into a particular logic state. The memory cell circuit is further modified by the addition of
a PMOS transistor and a load resistor in order to improve the retention characteristics of the memory cell. The retention
characteristics of both the "1" and "0" logic states are simulated. The simulations show that the
MFSFET memory cell design can maintain both the "1" and "0" logic states for a long period of time.
Author
Field Effect Transistors; Ferroelectricity; Metal Oxide Semiconductors; Computer Storage Devices; Memory (Computers);
Electric Potential; Transistors
20040068321 Lawrence Livermore National Lab., Livermore, CA
Investigation of Fluorescence Microscope as a Tool for Noninvasive Detection and Imaging of Damage Precursors at
351-nm
Demos, S. G.; Nostrand, M. C.; Staggs, M.; Carr, C. W.; Hahn, D.; Nov. 2001; In English
Report No.(s): DE2003-15004633; UCRL-JC-144367; No Copyright; Avail: National Technical Information Service (NTIS)
This work is an experimental investigation to evaluate the potential of fluorescence microscopy as a tool to detect surface
contamination as well as reveal surface damage precursors on DKDP and SIO2 optics. To achieve these technical objectives,
microscopic imaging systems were built that also incorporated in-situ damage testing capabilities. Fluorescence imaging
experiments were performed using 351-nm laser excitation while damage testing was performed at relatively high laser
fluences. The experimental results demonstrated the potential of this technique to address the aforementioned technical issues.
NTIS
Fluorescence; Microscopes; Evaluation
20040068325 Swedish Defence Research Establishment, Stockholm, Sweden
Fibre Optic Hydrophone Array Evaluation of Technique and Possibilitites
Kullander, F.; Levonen, M.; Moren, P.; Olsson, A.; Sep. 2003; In Swedish
Report No.(s): PB2004-104545; FOI-R-0950-SE; No Copyright; Avail: National Technical Information Service (NTIS)
A field experiment with fiber optic hydrophones was conducted at Oxdjupet September 9-112002. The purpose was to
collect experimental data suitable for evaluation of the fiber-optic hydrophone performance characteristics, especially at lower
frequencies. The question is, does a signature measured with a fiber-optic hydrophone have the potential to give better
classification compared to a signature measured with a conventional mine sensor. In the report, the authors compare data from
the fiber optic hydrophones measured at different ship passages with corresponding data from a dynamic pressure sensor and
a reference hydrophone. Gained experiences from the use of fiber optic hydrophones in a full-scale experiment are
summarized in the report. The high intensity caused by the passage of large ships gave unexpected disturbances in the signal.
Basically, the fiber optic hydrophones were over-driven meaning that the used demodulating algorithm ceased to work
correctly. Another disturbance, a low frequent oscillation around 2 Hz, observed in the fiber optic hydrophone recordings was
not at all visible in the reference recordings. A possible explanation of these oscillations can be related to defects in the
embedment of the hydrophone elements. The disturbances in the fiber optic signals have to a great extent complicated the
analysis and by that the comparison with the reference sensors. Based upon these results the authors have not found any
advantages of fiber-optic hydrophones for the use in mine sensor applications. However, fiber-optic techniques could make
it possible to construct new types of hydrophones such as large, area covering sensors.
NTIS
Acousto-Optics; Dynamic Pressure; Pressure Sensors
20040070738 NASA Lewis Research Center, Cleveland, OH, USA
The Au Cathode in the System Li2CO3-CO2-CO at 800 to 900 C
Hagedorn, Norman H.; Space Electrochemical Research and Technology: Abstracts; [1991], pp. 3; In English; See also
20040070726; No Copyright; Available from CASI only as part of the entire parent document
Gold is one of several metals being evaluated at NASA Lewis Research Center as positive electrode catalysts for an alkali
metal/molten alkali metal carbonate/carbon dioxide electrochemical cell. Such a cell is proposed for CO2-rich planetary
atmospheres such as those of Mars and Venus. Its application could be as a primary power supply, as a secondary power supply
recharged either ‘chemically’ by replenishment of the alkali metal or electrochemically from a central station power source,
or as a converter of carbon dioxide to oxygen via a complete electrochemical cycle. For the work being reported, lithium was
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