NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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flames are established at normal <strong>and</strong> microgravity conditions in the drop tower facility.<br />
Derived from text<br />
Microgravity; Premixed Flames<br />
20040111433 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Volatility of Common Protective Oxides in High-Temperature Water Vapor: Current Underst<strong>and</strong>ing <strong>and</strong> Unanswered<br />
Questions<br />
Opila, Elizabeth J.; [2004]; 9 pp.; In English; Conference on High Temperature Corrosion <strong>and</strong> Protection of Materials 6,<br />
16-21 May 2004, Les Embiez, France<br />
Contract(s)/Grant(s): 22-714-30-09; No Copyright; Avail: CASI; A02, Hardcopy<br />
Many structural materials rely on the formation of chromia, silica or alumina as a protective layer when exposed in high<br />
temperature oxidizing environments. The presence of these oxide layers provides a protective diffusion barrier which slows<br />
down further oxidation. In atmospheres containing water vapor, however, reactions to form volatile hydroxide species occur<br />
which remove the surface oxide, thus, lowering the protective capability of the oxide scale. This paper summarizes the current<br />
underst<strong>and</strong>ing of volatility of chromia, silica <strong>and</strong> alumina in water vapor containing combustion environments. In addition<br />
unanswered questions in each system are discussed. Th current paper represents an update on the considerable information<br />
learned in the past five years for these systems.<br />
Derived from text<br />
High Temperature Environments; Hydroxides; Oxides; Water Vapor; Volatility<br />
20040111449<br />
Rigorous Mathematical Modeling of the Adsorption System with Electrothermal Regeneration of the Used Adsorbent<br />
Petkovska, Menka T.; Sep. 29, 2003; 40 pp.; In English; Original contains color illustrations<br />
Contract(s)/Grant(s): FA8655-03-1-3010<br />
Report No.(s): AD-A425325; EOARD-SPC-03-3010; No Copyright; Avail: CASI; A03, Hardcopy<br />
This report results from a contract tasking University of Belgrade as follows: The contractor shall model a known <strong>and</strong><br />
existing single absorber of the hollow cylinder, several layers of activated carbon cloth. radial gas flow type. Modelling will<br />
incorporate: 1. Modeling of adsorption: Models of different complexity (local equilibrium, film mass transfer with or without<br />
dispersion, pore-surface diffusion, micropore diffusion <strong>and</strong> their combinations) of the hollow-cylinder absorber with radial gas<br />
flow will be established. 2. Modelling of heating of the bed by electric current: Model the thermal behavior of the adsorbent<br />
bed. This model will include the modelling of the electrical field within the absorber bed as well as the dominant heat transfer<br />
mechanisms. As a result. the temperature field within the bed can be predicted. 3. Modelling of electro-thermal desorption:<br />
Integrate the thermal model <strong>and</strong> the model or models for mass transfer. chosen as the most appropriate in the first phase<br />
(modeling of adsorption). This integration is not mechanical. as there is essential coupling between the heat generation <strong>and</strong><br />
heat transfer on one, <strong>and</strong> mass transfer on the other h<strong>and</strong>. As a result. it will be necessary to estimate additional or correct the<br />
models parameters estimated in the previous stages.<br />
DTIC<br />
Adsorbents; Adsorption; Mathematical Models; Thermoelectricity<br />
20040111512 Corps of Engineers, Washington, DC<br />
A Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Wetl<strong>and</strong> Functions of Rainwater<br />
Basin Depressional Wetl<strong>and</strong>s in Nebraska<br />
Stutheit, R<strong>and</strong>y G.; Gilbert, Michael C.; Whited, P. W.; Lawrence, Karen L.; May 2004; 114 pp.; In English<br />
Report No.(s): AD-A425490; ERDC/EL-TR-04-4; No Copyright; Avail: CASI; A06, Hardcopy<br />
The Hydrogeomorphic (HUM) Approach is a method for developing functional indices <strong>and</strong> the protocols used to apply<br />
these indices to the assessment of wetl<strong>and</strong> functions at a site- specific scale. The HUM Approach was initially designed to be<br />
used in the context of the Clean Water Act, Section 404 Regulatory Program permit review to analyze project alternatives,<br />
minimize impacts, assess unavoidable impacts, determine mitigation requirements, <strong>and</strong> monitor the success of compensatory<br />
mitigation. However, a variety of other potential uses have been identified, including the determination of minimal effects<br />
under the Food Security Act, design of wetl<strong>and</strong> restoration projects, <strong>and</strong> management of wetl<strong>and</strong>s This report uses the HUM<br />
Approach to develop a Regional Guidebook to (a) characterize ponded, herbaceous marshes on the loess plain of south-central<br />
Nebraska, (b) provide the rationale used to select functions of ponded, herbaceous depressional marsh subclass, (c) provide<br />
the rationale used to select model variables <strong>and</strong> metrics, (d) provide the rationale used to develop assessment models, (e)<br />
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