NASA Scientific and Technical Aerospace Reports

This report is an overview and discussion of the finer details not found in most of the photon mapping documents that
currently exist. While the vast majority of photon mapping media tends to market this global illumination algorithm as a
do-it-all turn-key solution, they fail to discuss the finer details and pitfalls that developers will encounter in the implementation
process. Finer details are also covered to not only explain what to expect during the implementation process, but also to
provide graphical examples that may serve as a beacon during the various milestones throughout the implementation process.
DTIC
Mapping; Photons; Surveys
20060002441 Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek, The Hague, Netherlands
Geographical databases based on satellite images: Macedonia case
vandenBroek, A. C.; Dekker, R. J.; Smith, A. J. E.; June 2005; 61 pp.; In Dutch; Original contains color illustrations
Contract(s)/Grant(s): A02/KL/655; TNO Proj. 32978
Report No.(s): TD2004-0425; TNO-DV1 2004 A047; Copyright; Avail.: Other Sources
The study is focused on geographical databases on basis of satellite imagery for the purpose of military terrain analysis.
As test area the Polog valley in Macedonia is chosen, where operation FOX took place in 2002. Satellite data used, are from
Landsat 7, Spot 5 and Quickbird. An analysis is made to show which information obtained from satellite imagery can meet
the requirements of a military geographical database. Various geographical products are obtained and described like helicopter
land zones, 3D views for situational awareness and updated road networks. High-resolution Quickbird data are the basis for
products, which give detailed information of a specific place. More tactical oriented information is obtained with radar
imagery by applying change detection techniques. The results of the study will be used for a demonstration of a terrain analysis
module.
CASI
Terrain Analysis; Satellite Imagery; Data Bases
44
ENERGY PRODUCTION AND CONVERSION
Includes specific energy conversion systems, e.g., fuel cells; and solar, geothermal, windpower, and waterwave conversion systems;
energy storage; and traditional power generators. For technologies related to nuclear energy production see 73 Nuclear Physics. For
related information see also 07 Aircraft Propulsion and Power; 20 Spacecraft Propulsion and Power; and 28 Propellants and Fuels.
20060001874 Aerospace Corp., El Segundo, CA USA
Failure Model for a Leaking Nickel-Hydrogen Cell
Zimmerman, A. H.; Aug. 30, 2005; 19 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): FA8802-04-C-0001
Report No.(s): AD-A440426; ATR-2005(8555)-6; SMC-TR-06-02; No Copyright; Avail.: CASI: A03, Hardcopy
A model has been developed and used to analyze the loss of capacity and dry out of nickel-hydrogen cells as a result of
pressure vessel leaks. This analysis has allowed a number of conclusions to be drawn about the behavior of nickel-hydrogen
cells with leaks: Cells that are repeatedly cycled may not lose all capacity by leaking their hydrogen. There is a leak size
threshold at 1-2.5 um below which nickel-hydrogen cells will not dry out by gas. There is a leak size threshold at 0.1-0.2 um
below which it will be difficult to identify the rate of capacity loss as differing significantly from normal wear-related capacity
loss rates. Pre-existing leaks smaller than about 0.1 um cannot be detected by typical leak detection methods. Leak latency
can occur if pre-existing subthreshold leaks grow in size during the cell operation.
DTIC
Failure; Hydrogen; Leakage; Models
20060002036 Army Construction Engineering Research Lab., Champaign, IL USA
Energy Trends and Their Implications for U.S. Army Installations
Fournier, Donald F.; Westervelt, Eileen T.; Sep. 1, 2005; 86 pp.; In English; Original contains color illustrations
Report No.(s): AD-A440265; ERDC/CERL-TR-05-21; No Copyright; Avail.: Defense Technical Information Center (DTIC)
The primary issues affecting energy options are those of availability, affordability, sustainability, and security. Since
energy resources are unevenly distributed around the world, and the impacts of energy consumption have global reach in both
environmental and political terms, any meaningful review of energy-related issues must take a global perspective. This work
synopsizes world and national energy issues (including energy source options, resource stocks, and future prognosis) in the
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