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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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Solvent Structuring around Protein Molecules and Dynamics of the Molecular Self-Assembly
No abstract available
Molecular-Level Thermodynamic and Kinetic Parameters for Crystalline
No abstract available
Molecular Mechanisms of Microheterogeneity-Induced Defect Formation in Ferritin Crystallization
No abstract available
Temperature-independent Solubility and Interactions Between Apoferritin Monomers and Dimers in Solution
No abstract available
Launch vehicle accident assessment for Mars Exploration Rover missions
This paper presents the methodology used in the launch and space vehicle portion of the nuclear risk assessment for the two Mars Exploration Rover (MER) missions, which includes the assessment of accident scenarios and associated probabilities.
Comet 55P/Tempel-Tuttle and the Upcoming Leonid Meteor Events
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Are the Leonid Meteor Storms Coming?
In February 1997, the Japanese Space Agency ISAS launched the first space VLBI Space Observatory Program Satellite (VSOP) using the newly developed M-V launch vehicle.
The Upcoming Approach of Comet Tempel-Tuttle and the Leonid Meteors
Using the available observations in 1699, 1865-66, and 1965, and orbit has been re-computed for periodic comet 55P/Tempel-Tuttle, the parent body of the Leonid Meteors.
Are the Leonid Meteor Storms Coming?
On Nov. 17, 1996 an extraordinary Leonid meteor storm (144,000 per hour) was witnessed by observers in central and western United States. With an orbital period of 33 years, the next return to perihelion will be Feb. 28, 1998. Because the distribution of the particles flying in formation with the parent comet is poorly known, no secure predictions can be made for Leonid meteor storms in the coming years.
Backward Integration of a SL9 Type Comet
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The Long Term Motion of Comet P/Swift-Tuttle
The orbit of P/Swift-Tuttle is investigated by way of a long term integration forward to +2392 and backward to -702.
Human Casualties and Structural Damage Due to Meteorite Falls Found In East Asian Histories
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Comet P/Swift-Tuttle: Its Orbital Motion from 703 BC to AD 2392
We performed an investigation of the orbit of P/Swift-Tuttle via a long-term integration forward to AD 2392 and backward to 703 BC.
Building Modern Cometary Models Using Ancient Chinese Data
For more than two millennia, ancient Chinese court astronomers maintained a rather comprehensive record of cometary sightings.
Sensitivity of Multiangle Imaging to the Optical and Microphysical Properties of Biomass Burning Aerosols
The treatment of biomass burning (BB) carbonaceous particles in the Multiangle Imaging SpectroRadiometer (MISR) Standard Aerosol Retrieval Algorithm is assessed, and algorithm refinements are suggested, based on a theoretical sensitivity analysis and comparisons with near-coincident AERONET measurements at representative BB sites. Over the natural ranges of BB aerosol microphysical and optical properties observed in past field campaigns, patterns of retrieved Aerosol Optical Depth (AOD), particle size, and single scattering albedo (SSA) are evaluated. On the basis of the theoretical analysis, assuming total column AOD of 0.2, over a dark, uniform surface, MISR can distinguish two to three groups in each of size and SSA, except when the assumed atmospheric particles are significantly absorbing (mid-visible SSA approx.0.84), or of medium sizes (mean radius approx.0.13 pin); sensitivity to absorbing, medium-large size particles increases considerably when the assumed column AOD is raised to 0.5. MISR Research Aerosol Retrievals confirm the theoretical results, based on coincident AERONET inversions under BB-dominated conditions. When BB is externally mixed with dust in the atmosphere, dust optical model and surface reflection uncertainties, along with spatial variability, contribute to differences between the Research Retrievals and AERONET. These results suggest specific refinements to the MISR Standard Aerosol Algorithm complement of component particles and mixtures. They also highlight the importance for satellite aerosol retrievals of surface reflectance characterization, with accuracies that can be difficult to achieve with coupled surface-aerosol algorithms in some higher AOD situations.
Low-Cost Propellant Launch to LEO from a Tethered Balloon - 'Propulsion Depots' Not 'Propellant Depots'
As we have previously reported, it may be possible to launch payloads into low-Earth orbit (LEO) at a per-kilogram cost that is one to two orders of magnitude lower than current launch systems, using only a relatively small capital investment (comparable to a single large present-day launch). An attractive payload would be large quantities of high-performance chemical rocket propellant (e.g. Liquid Oxygen/Liquid Hydrogen (LO2/LH2)) that would greatly facilitate, if not enable, extensive exploration of the moon, Mars, and beyond.
Issues in Assessing Reliability Risk for Software-Intensive Space Systems
No abstract available