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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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Analysis and assignment of rotational spectra using windows software
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The Martian Subsurface as a Potential Window into the Origin of Life
Few traces of Earth's geologic record are preserved from the time of life's emergence, over 3,800 million years ago. Consequently, what little we understand about abiogenesis - the origin of life on Earth - is based primarily on laboratory experiments and theory. The best geological lens for understanding early Earth might actually come from Mars, a planet with a crust that's overall far more ancient than our own. On Earth, surface sedimentary environments are thought to best preserve evidence of ancient life, but this is mostly because our planet has been dominated by high photosynthetic biomass production at the surface for the last approximately 2,500 million years or more. By the time oxygenic photosynthesis evolved on Earth, Mars had been a hyperarid, frozen desert with a surface bombarded by high-energy solar and cosmic radiation for more than a billion years, and as a result, photosynthetic surface life may never have occurred on Mars. Therefore, one must question whether searching for evidence of life in Martian surface sediments is the best strategy. This Perspective explores the possibility that the abundant hydrothermal environments on Mars might provide more valuable insights into life's origins.
Degradation of Silica and Sapphire Windows at Elevated Temperatures
Silica and sapphire are very stable oxide materials. However, at high temperatures they are both susceptible to chemical degradation by three major mechanisms: (1) Deposition of fluxing oxides (2) Non-reactive vaporization (3) Reactive vaporization, particularly by water vapor. In order to model and predict each of these, accurate thermodynamic data and information on the environment are needed. Experimental and theoretical methods used at NASA for identifying the generated gas species and obtaining the relevant thermochemical data are discussed. Modeling and prediction of degradation are discussed for different environments and flow conditions. In addition, surface devitrification or etch pitting is likely under some conditions.
Observational window effects on multi-object reverberation mapping
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Stratospheric imaging of polar mesospheric clouds: A new window on small‐scale atmospheric dynamics
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LAUNCH WINDOW STUDIES EMPLOYING VARIATIONAL CALCULUS TO DETERMINE OPTIMUM THREE DIMENSIONAL TRAJECTORIES LEADING TO INJECTION INTO A SPACE-FIXED CIRCULAR ORBIT
Determination of optimum trajectories leading to circular orbits
LAUNCH WINDOW STUDIES EMPLOYING VARIATIONAL CALCULUS TO DETERMINE OPTIMUM THREE DIMENSIONAL TRAJECTORIES LEADING TO INJECTION INTO A SPACE-FIXED CIRCULAR ORBIT
Determination of optimum 3-dimensional trajectories to inject a saturn c-5 rocket into a space-fixed circular orbit
Anti-reflection coated vacuum window for the Primordial Inflation Polarization ExploreR (PIPER) balloon-borne instrument
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Absorption coefficients of O4 at oxygen windows
Monochromator measurements of oxygen absorption coefficients at various wavelengths
An atlas of Tiros 7 monthly maps of emitted radiation in the 8-12 micron atmospheric window over the Indian Ocean area
Tiros 7 monthly maps of infrared radiation over Indian Ocean area
Windowed region-of-interest non-uniformity correction and range walk error correction of a 3D flash LiDAR camera
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Infinity display optical unit - Pancake Window, patent 3,443,858 Final technical report
Infinity display optical unit for use in aerial or space training simulators
Neural information processing - Windows without and the citadel within
Neural information processing taking into account differences between living brain and artificial processor
Determination of ILS category 2 decision height window requirements
A method for determining the appropriate longitudinal and lateral decision height dispersion limits for any airplane/control system combination during an instrument landing approach is presented. An example is worked out to clarify the steps required. It is shown that the current longitudinal decision height dispersion limits are well suited for a DC-8 with the example control system, but that the lateral limits are too loose to guarantee acceptable touchdowns with the example system subjected to recommended wind and shear disturbances.
Spectrophotometry of the 1.5-micron window of Jupiter.
The limb darkening of the 1.5-micron region and the variations of ammonia and methane absorptions over the Jovian belts, zones, and spots are studied on the basis of high-resolution infrared spectrometric data obtained for 86 areas on the Jovian surface. It is shown that the absorptions increase with increasing air mass between the equator and the poles, that they decrease linearly with increasing air mass between the central meridian and the limbs, and that the absorptions over the South Tropical Zone are greater and those over the Great Red Spot are smaller than the absorptions for other features. An ammonia absorption map of the planet is plotted for the period April-June, 1970.
Mach-Zehnder optical configuration with Brewster window and two quarter-wave plates
Configuration is improvement because of the following: It provides higher efficiency. It reduces or eliminates feedthrough of untranslated local oscillator, which would produce a beat signal at shifted frequency of translator. When used without translator and with low-power detector, telescope secondary mirror reflects portion of output to local oscillator.