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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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This talk summarizes experimental effort to characterize the outgassing rate of rod heaters (Watrods) used for GOES-R thermal vacuum testing. QCM data obtained with unbaked rods indicated that the outgassing exceeded the allowable budget. We then pre-baked the watrods for 16 hours at ambient pressure and determined that pre-baking reduced the amount of outgassed material by a factor of 4.
Robots based on tensegrity structures (interconnected rods and cables) offer many advantages such as low weight, small volume when packed, and have high impact resistance. Unfortunately tensegrity robots can be difficult to make and scale due a fundamental design trade-off: they need to have enough tension in the structure to maintain its integrity, while not having so much tension that it is difficult to actuate,change shape and move. This paper addresses this issue with three approaches:1) Traction based pulley actuation that is less sensitive to the tensioning of the structure, 2) A mix of elastic and inelastic cables allowing for a better balance between tensioning and actuation and 3) Using flexible rods allowing for actuation with inelastic cables. We test configurations and show that these approaches can indeed increase the scalability and usefulness of tensegrity robots.
Measurement of heat transfer in a graphite rod heat exchanger
Eddy-current damper and gravity-gradient rod development
Magnetostatic spin wave propagation at microwave frequencies in magnetized rod
Systems constraints imposed on spacecraft utilizing long flexible rods with attached tip masses, specifically deployment and retraction problems
Improved penning-type ionization gage provides range and sensitivity required to measure gas pressure below .01 torr under high vacuum conditions. The gage uses a highly conductive cathode composed of two disks of high magnetic permeability separated by a rod of low magnetic permeability.
Development and fabrication of neodymium doped YAG laser rods - growth of YAG crystals
Digital computer method for determining eddy current and hysteresis losses in cylindrical rod of No. 1010 steel
Echo mode in YIG rods has different behavior in magnetic fields. This mode, discovered at 8.5 gigahertz, experiences a linear variation. The time delay exhibited is a linear function of the applied magnetic field and the input pulse frequency.
Streaming birefringence study of interaction of submicroscopic rods and spheres
Development, fabrication, and evaluation of neodymium doped YAG laser rods
Noise measurements in computer simulated rod model of plasma
Remote actuation of a gripper shaft affects vertical engagement between a drive shaft and control rod. A secondary function of the gripper is to provide remote indication of positive completion of the gripping or ungripping operation.
Fluid amplifier applications to gas cooled reactor rod control
Nuclear reactor space power using out of pile thermionic diodes and heat pipes cooling with control rods
Longitudinal stability of rods subjected to random forces