Prevention of pressure build-up in electrochemical cells Patent
Preventing pressure buildup in electrochemical cells by reacting palladium oxide with evolved hydrogen
Donnelly, P. C.↗
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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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Experiments with ferrocene
Acetylferrocene preparation by reacting ferrocene with acetic anhydride in phosphoric acid and reducing acetylferrocene to alpha-hydroxyethyl ferrocene by potassium borohydride in methanol
Mcmanus, S. P.↗
Thermodynamic computations for the gasdynamic analysis of explosion phenomena
Gas dynamics analysis of explosion phenomena based on unsteady flow fields and thermodynamic properties of chemically reacting substance
Oppenheim, A. K.↗
Crossed-beam study of the reactive asymmetry of oriented methyl iodide molecules with rubidium
Crossed molecular beam study of reactive asymmetry of oriented methyl iodide molecules reacting with Rb, accounting for observations with hard sphere model
Bernstein, R. B.↗
The effects of upstream mass injection on downstream heat transfer
Upstream mass injection effects on downstream heat transfer of supersonic reacting boundary layer
Walker, W. F.↗
Analytically determined nonequilibrium mixture properties in high expansion ratio nozzles
Nonequilibrium gasdynamic and thermodynamic properties of chemically reacting gas mixtures in high expansion subsonic and supersonic nozzles for selected rocket propellants
Burwell, W. G.↗
Preparation of homogeneous vitreous materials for electronic and optical devices
Vitreous material builds up as series of solidified layers on inside walls of sealed quartz ampoule containing molten constituents of material, and forms well defined shapes to close dimensional tolerances. Ampoules are made of material which does not react with melt and has lower thermal expansion coefficient than solidified layer.
Gatos, H. C.↗
On chemical reactions in the char zone during ablation
Analysis of reacting flow of pyrolysis products through char layer of low density, nylon phenolic resin, charring ablators and porous graphite
April, G. C.↗
Technological problems anticipated in the application of fusion reactors to space propulsion and power generation
Fusion reactor applications to space propulsion and power generation, considering conversion of thermal energy of reacting plasma to electrical power and exhaust jet
Rayle, W. D.↗
Fluidic Ignition Detection
Ignition sensor, utilizing fluidic oscillator device and its ability to react to flow system's molecular weight and temperature changes, detects propellant ignition. Commercial applications include fields of fire protection equipment and fluidics.
Henry, C. S.↗
Improved synthesis of intermetal compounds
Method in crystal growth using liquid encapsulation techniques permits GaAs synthesis of materials from constituent elements whose vapor pressures are high at temperature at which they react spontaneously. Techniques may be useful for synthesis of GaP.
Haggerty, J. S.↗
Carbon dioxide concentrator
Passed exhaled air through electrochemical cell containing alkali metal carbonate aqueous solution, and utilizes platinized electrodes causing reaction of oxygen at cathode with water in electrolyte, producing hydroxyl ions which react with carbon dioxide to form carbonate ions.
Williams, C. F.↗
A closed loop cryogenic environment pressure regulating system
Nonlinear closed loop control system to regulate the pressure in a cryogenic environment is described. System employs four position contactor with two control bands to react to the signals. Diagrams of element transfer function and required equipment are included.
Huguley, J. C.↗
Degradation and recovery mechanisms in lithium-doped solar cells
Several groups of lithium-doped solar cells have been evaluated under 1-MeV electron irradiation. Many of these groups indicated superior electrical output after irradiation and recovery as compared to similarly irradiated n/p solar cells. The superior cells are those with lithium concentrations of 2 to 5 x 10 to the 14th power atoms per cu cm at the junction. An irradiation of lithium-doped cells with 28-MeV electrons indicated a tenfold advantage of lithium-doped cells over n/p cells. Studies of the changes in the lithium concentration during recovery have shown the amounts of lithium reacting is highly nonlinear in regard to the electron fluence and varies greatly with distance from the junction. The results indicate that precipitation of lithium on radiation defects may be the cause of recovery rather than ion pairing.
Downing, R. G.↗
New methods for preparing N,N-dialkyltrifluoroacetamides
The customary preparative methods for N,N-dialkyltrifluoroacetamides involve the acylation of an amine by trifluoroacetic acid or its derivatives. The synthesis of N,N-dialkyltrifluoroacetamides by reacting trifluoroacetic anhydride or acid with disubstituted formamides and acetamides is discussed. These reactions were interpreted with the aid of gas chromatographic analysis. Different reaction mechanisms are proposed for the reactions of formamides and acetamides with trifluoroacetic anhydride or acid. The use of the proposed reaction mechanisms for the synthesis of other fluorinated compounds is discussed.
Hsu, L.↗
The atom-molecule reaction D plus H2 yields HD plus H studied by molecular beams
Collisions between deuterium atoms and hydrogen molecules were studied in a modulated crossed beam experiment. The relative signal intensity and the signal phase for the product HD from reactive collisions permitted determination of both the angular distribution and HD mean velocity as a function of angle. From these a relative differential reactive scattering cross section in center-of-mass coordinates was deduced. The experiment indicates that reactively formed HD which has little or no internal excitation departs from the collision anisotropically, with maximum amplitude 180 deg from the direction of the incident D beam in center-of-mass coordinates, which shows that the D-H-H reacting configuration is short-lived compared to its rotation time. Non reactive scattering of D by H2 was used to assign absolute values to the differential reactive scattering cross sections.
Geddes, J.↗
Development of a tape transport bacterial detection system
The feasibility of a tape transport chemiluminescence system for bacterial monitoring of regenerated water was demonstrated using a manually operated laboratory breadboard. The principle of detection is based on measuring the increase in chemiluminescence produced by the catalytic action of bacterial porphyrins on a luminol-hydrogen peroxide mixture. Viable organisms are distinguished from nonviable by comparing the signals of incubated and unincubated water samples. Using optimized protocols, sensitivities were obtained with 400 ml suspensions of E. coli and Cl. sporogenes. The sensitivity of the unincubated cycle E. coli (aerobe) was found to be 30 to 35 cells/m1, and that of the Cl. sporogenes (anaerobe) was 1000 to 10,000 cells/m1. The lower sensitivity toward Cl. sporogenes is attributed to several factors, namely the lower cytochrome content, the tendency to sporulate, long lag periods and the lower growth rate of Clostridia in general. The operational procedures used for processing the incubated and unincubated samples involved the following sequence: (1) concentrating the sample by filtration through a membrane filter, (2) washing with Dextrose-Thioglycollate Broth (3) incubating (0 to 4 hrs as required), (4) washing with 4M Urea, and (5) reacting with reagent in front of a photomultiplier tube. The signal output was recorded on a strip chart recorder.
Witz, S.↗
Reactivity of simulated lunar material with fluorine
Simulated lunar surface material was caused to react with fluorine to determine the feasibility of producing oxygen by this method. The maximum total fluorine pressure used was 53.3 kilonewtons per square meter (400 torr) at temperatures up to 523 K (250 C). Postreaction analysis of both the gas and solid phases indicated that the reaction is feasible but that the efficiency is only about 4 percent of that predicted by theory.
Odonnell, P. M.↗