SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Study of hydrogen slush-hydrogen gel utilization is presented in two volume publication. The first volume contains the physical and thermal property data for hydrogen used in the study. In the second volume, details of the technical effort are presented including parametric analysis of effects on vehicle systems.
Handbook of physical and thermal property data for hydrogen in region between triple point and critical point for study of hydrogen slush and/or hydrogen gel utilization
Surface parameter measurements of stannic oxide in powder, ceramic and gel forms by nitrogen adsorption techniques
Adsorption equilibrium data obtained at high pressure for methane and propane on silica gel using radioactive tracer pulsing
Low angle light scattering diffraction patterns of ionotropic gels, formed by Ca ion diffusion into polygalacturonate solution, indicating organized structures
Slush hydrogen and nitrogen gels for rocket propellants
Dispersion in gel permeation chromatograph, noting contributions of injection and detection systems to peak broadening and retention time
Dispersion in gel permeation chromatography, noting eddy diffusion in chromatographic columns
Molar heat and entropy of adsorption and activity coefficient of adsorbed phase for methane-ethane- silica gel system
Single crystal growth by controlled diffusion in silica gel using metathetical and decomplexation reactions
Gel permeation chromatography of nominally linear aliphatic polyesters, using tetrahydrofuran solvent at 37 degrees C
Calcium phosphate crystals precipitation from nutrient gel to determine role of gelatinous ground substance in calcification
Dispersion /peak broadening/ in gel chromatography measured with nonporous and porous column packings, suggesting diffusion controlled separation with linear permeation isotherm
Gel permeation chromatography peak broadening, discussing liquid dispersion factors and column efficiency
Intermittent type silica gel adsorption refrigerator for providing temperature control for spacecraft components
Coiled section of tubing measures viscous properties of gelled cryogenic propellants under conditions closely resembling flow in rocket engine systems. Characteristic flow curve provides data necessary for the design of prototype hardware systems using the liquid or gel of interest.
Gel-permeation chromatography was used to analyze C-ether lubricant formulations from high-temperature bearing tests and from micro-oxidation tests. Three mu-styragel columns (one 500 and two 100 A) and a tetrahydrofuran mobile phase were found to adequately separate the C-ether degradation products. The micro-oxidation tests yielded degradation results qualitatively similar to those observed from the bearing tests. Micro-oxidation tests conducted in air yielded more degradation than did tests in nitrogen. No great differences were observed between the thermal-oxidative stabilities of the two C-ether formulations or between the catalytic degradation activities of silver and M-50 steel. C-ether formulation I did yield more degradation than did formulation II in 111- and 25-hour bearing tests, respectively.
The gravity receptors of all vertebrates utilize a 'test mass' consisting of a complex arrangement of mineral and organic substance that lies over the sensory receptor areas. In most vertebrates, the mineral is a polymorph of calcium carbonate in the form of minute, single crystals called otoconia. An investigation is conducted to determine the number of proteins in otoconial complexes and their molecular weights. The investigation makes use of a microdisk gel electrophoresis method reported by Gainer (1971). The most important finding of the reported research is that analysis of the proteins of the organic material of the otoconial complexes is possible when sensitive microanalytical methods are employed. Further modification of the basic technique employed and the inclusion of other sensitive staining methods should mean that, in the future, protein separation by molecular weight will be possible in sample pools containing only two otoconial masses.