A paper describes a process for imposing safety constraints on a spacecraft trajectory design. The conventional process has the ACS (Attitude Control System) team define geometric constraints, then the NAV (Navigation) team produces a compliant thrust direction...

A document describes a design optimization method for determining optimal shapes for vehicles with mid-range lift-to-drag ratios that are entering or re-entering planetary atmospheres. The design space includes consideration of hypersonic aerothermodynamic properties (for minimizing heating)...

A document describes a coastal ocean color instrument for geostationary orbit that meets the science requirements within a size, mass, and cost package that is acceptable within current budgetary constraints. This work advances the instrument design concept for the Coastal Ocean Ecosystem...

A document discusses a method for simple and efficient numerical integration (quadrature) of integrals characterized by a near-hypersingularity. Near-hypersingular integrals arise in gradients of Newton-type potentials when the fields at a desired observation point are close to the source. The...

A study discusses a robust intercalibration technique using a well validated radiative transfer code that can be applied to the higher-frequency sounding channels for the NASA Global Precipitation Measurement (GPM) mission. Intercalibration of these high-frequency sounding channels will...

Scientists at the U.S. Naval Research Laboratory (NRL) have suggested a method that could significantly increase the efficiency of green-blue-ultraviolet light-emitting diodes based on GaInN/GaN, AlGaN/GaN, and AlInN/GaN quantum wells. Their approach could enable advances in...