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Wet Active Chevron Nozzle for Controllable Jet Noise Reduction
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Laser Vision Helps Package Shippers See Clearly

An analyzer developed for Hubble mirror testing helps FedEx scan packages.For more than 25 years, the Hubble Space Telescope has provided stunning photos of the universe unequalled in their depth, detail, and distinction. But in its early days, Hubble wasn't capable of sending back such breathtaking photos. Within weeks of launch, the images beamed back to Earth were fuzzy and out of focus. It was determined that Hubble's primary mirror had been ground to the wrong shape and was too flat by 2.2 micrometers, causing reflected light from the edge of the mirror to be focused on a different point than light coming from near the center. It was determined that the device used to create the nonspherical mirror had been incorrectly assembled, and the mirror's manufacturer had failed to notice the problem before Hubble was launched.

Posted in: Articles, Imaging

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GPGPU for Embedded Systems

High Performance Embedded Computer (HPEC) systems are now leaning toward using the specialized parallel computational speed and performance on General Purpose Graphic Processor Units (GPGPUs). Providing that power and performance in a rugged, extended temperature small form factor (SFF) can be challenging.

Posted in: White Papers, Aeronautics, Defense, Machinery & Automation, Robotics

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Use of Beam Deflection to Control an Electron Beam Wire Deposition Process

NASA Langley Research Center researchers have a strong technology foundation in the use of electron-beam (e-beam) deposition for freeform fabrication of complex shaped metal parts. While e-beam wire deposition is of interest for rapid prototyping of metal parts, cost-effective near-net shape manufacturing, and potential use in space, it is also of intense interest for industrial welding and fabrication in a range of applications, from small components to large aerospace structures. Through significant advancements in techniques to improve control of the process, NASA greatly expands upon the capabilities of the e-beam fabrication and welding process.

Posted in: Briefs, Manufacturing & Prototyping

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Thermal Stir Welding Process

NASA's Marshall Space Flight Center is developing an improved joining technology called thermal stir welding that improves upon fusion welding and friction stir welding. This new technology enables a superior joining method by allowing manufacturers to join dissimilar materials and to weld at high rates. NASA's technology offers users an exciting alternative to state-of-the-art fusion and friction stir welding technologies.

Posted in: Briefs, Manufacturing & Prototyping

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Systems, Apparatuses, and Methods for Using Durable Adhesively Bonded Joints for Sandwich Structures

A preform insert enables redundant bond lines and mass efficient load transfer across the joint.NASA'S Langley Research Center has developed a new adhesively bonded joint concept for curved and flat panel sandwich architectures. A woven preform, inserted into the seam between sandwich panels, provides a larger total bonding area and multiple load paths for an improved distribution of load through the joint. NASA is able to create structures by joining sections of sandwich panels or curved shells. The new joint provides more durable load transfer and redundant load paths compared to current state-of-the-art adhesively bonded strap joints.

Posted in: Briefs, Manufacturing & Prototyping

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Preliminary Design of a Cryogenic Hydrogen Radiation Shield for Human Spaceflight

Liquid hydrogen is the most mass-efficient radiation shielding material.Human susceptibility to the harsh space radiation environment has been identified as a major hurdle for exploration beyond low-Earth orbit (LEO). High-energy protons and nuclei ions from Solar Energetic Particles (SEPs) and Galactic Cosmic Rays (GCRs) can result in radiation doses that are dangerous to astronaut health and even survivability if the astronauts are not adequately shielded. These high-energy particles also cause significant amounts of secondary radiation when they impinge on the spacecraft structure. Hydrogen or hydrogen-rich materials are ideal materials for radiation shielding because hydrogen does not easily break down to form a secondary radiation source.

Posted in: Briefs, Manufacturing & Prototyping

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Methods of Making and Using Tubular Solid Oxide Fuel Cells (SOFCs)

SOFCs have applications in vehicle auxiliary power units, and emergency backup power for telecom and cable repeaters.Human-occupied vehicles and autonomous vehicles such as rovers and landers may benefit from the fuel flexibility and high energy density of solid oxide fuel cells (SOFCs), compared to batteries and polymer electrolyte membrane (PEM) systems. Fuel systems greater than 1 kW are traditionally planar and exhibit high volumetric power density; however, due to large sealing areas, they have poor cycling characteristics. Recently, 250 cycles on a Tubular SOFC (T-SOFC) system (Protonex Technology Corp.) was demonstrated. Hot zones designed around T-SOFCs have a lower packing density, but significantly better cycle life and start times, making them an ideal solution. By increasing the power density of T-SOFCs, overall hot zone and system volumetric power densities can be greatly improved. Extending the methodology of freeze-casting to T-SOFCs will provide a system with the micro-structural advantages of their planar counterpart, but with the rapid thermal cycling capacity of traditional extruded SOFCs.

Posted in: Briefs, Manufacturing & Prototyping

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