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.
Methyl iodide reacted with Rb measured for reactive asymmetry as function of scattering angle and degree of alignment
Local time asymmetries in increase of electron fluxes in outer Van Allen zone during substorms
East-west asymmetry in solar wind velocity
Geomagnetic response asymmetry related to solar direction of polarity in interplanetary magnetic field
East-west asymmetry in solar wind velocity due to solar rotation effects on interaction between fast and slow streams
Life detection for space missions based on detecting optical asymmetry in biogenic molecules by gas chromatography involving diastereomeric esters synthesis
Solar protons delayed access into polar regions during 2 November 1967 solar particle event, discussing north-south asymmetry
Angle of attack analysis of spinning slender reentry cone with slight aerodynamic and mass asymmetries
Crossed molecular beam study of reactive asymmetry of oriented methyl iodide molecules reacting with Rb, accounting for observations with hard sphere model
Magnetospheric electric field configuration from trapped particle flux asymmetries, using Explorer 14 electron data
Life detection for space missions based on detecting optical asymmetry in biogenic molecules by gas chromatography involving diastereomeric esters synthesis
Spinning rocket vehicle with aerodynamic asymmetry, deriving equations of motion and steady aeroelastic behavior
Trapped protons east-west asymmetry observations during Gemini 4 flight, using on-board high sensitivity plastic-scintillation spectrometer
Asymmetries in magnetospheric shock layer due to upstream interplanetary magnetic field, considering forward stagnation region of solar wind-magnetosphere interaction
Experiments were conducted with a setup in which a Co-57 single-line source was driven by a constant-acceleration motor. The 14.4-keV gamma rays emitted from the iron foil scatterer were detected by a proportional counter filled with krypton and carbon dioxide. The interference for individual Zeeman hyperfine transitions in a magnetic field was calculated. It was found that beside the cos phi angular dependence of line shape asymmetry, there exists a sin phi intensity dependence for some of the hyperfine transitions.
The profiles of 20 Fraunhofer lines at the center of the solar disk and near the limb (cos theta = 0.44) were obtained, using the double-pass system. After correcting for the influence of the apparatus, the line profiles were investigated for the asymmetry run.
The moon is asymmetric in crustal thickness and also in the distribution of maria and gamma radioactivity. Early bombardment of the moon by planetesimals, in both heliocentric and geocentric orbits, is examined as a possible cause of the asymmetries. The presence of a massive companion (earth) causes a spin-orbit coupled moon to be bombarded nonuniformly. The most pronounced local concentration of impacts would have occurred on the west limb of the moon, when it orbited close to the earth, if low-eccentricity heliocentric planetesimals were still abundant in the solar system at that time. A very intense bombardment of this type could have redistributed crustal material on the moon, thinning the west limb crust appreciably. This would have caused a change in position of the principal axes of inertia, and a reorientation of the spin-orbit coupled moon such that the thinnest portion of its crust turned toward one of the poles. Erupting lavas would have preferentially flooded such a thin-crusted, low-lying area. This would have caused another readjustment of principal moments, and a reorientation of the moon such that the mare areas tipped toward the equator.
A study of data from the Apollo lunar surface suprathermal ion detector experiment (Side) package shows that plasma flow and energy parameters in the dusk magnetosheath are much better correlated with geomagnetic activity than those in the dawn magnetosheath. This result is in agreement with a dawn-dusk asymmetry in the magnetosheath magnetic field and in the bow shock configuration. The different orientations between the mean interplanetary magnetic field direction and the shock normal for the magnetosheaths suggest an explanation of the difference in the plasma parameters on the two sides.