Keyword: Casting

Briefs: Mechanical & Fluid Systems

Unwanted porosity is typical to many manufacturing processes — from traditional casting to additive manufacturing (3D printing) — and is difficult to avoid entirely....

Briefs: Robotics, Automation & Control

A fundamental advance in controlling soft robots involves using magnetic fields to remotely manipulate microparticle chains embedded in soft robotic devices. Several devices have been developed...

Briefs: Propulsion

NASA's Langley Research Center is seeking to improve upon stock stainless steel flame holders. Researchers at NASA Langley have developed a new ceramic design with a service temperature of 4000 °F. The combination of...

Briefs: Photonics/Optics
Additive-Manufactured, Very Lightweight, Diamond Turned Aspheric Mirror

Industrial-grade, lightweight mirrors used in military and aeronautics have tight specifications brought on by demanding performance parameters. For example, a mirror that is used in an orbiting telescope would have to be extremely lightweight, stiff, and be configured to...

Briefs: Materials

Sometimes referred to as “solid smoke,” aerogels are the world’s lightest solid materials, composed of approximately 85% air by volume. Polyamide aerogels open up a whole new world of...

Articles: Aerospace
Vote for Tech Briefs 22nd Annual Readers' Choice Awards

Each December, we ask our readers to cast their vote for the annual NASA Tech Briefs’ Readers’ Choice Product of the Year Awards. Each month, our editors choose a Product of the Month that has exceptional technical merit and practical value for our design engineering readers.

Briefs: Mechanical & Fluid Systems
Process for Forming a High-Temperature Single Crystal Preloader

Friction has long been a thorny problem for sealing-device designers. Traditional sealing devices rely on a contacting relationship between surfaces and sealing elements to prevent fluid leakage, but in the case of moving elements, this contact produces friction that causes wearing...

Briefs: Materials
Flexible, High-Temperature Polyimide/Urea Aerogels

Cross-linked silica-based aerogels with polymeric materials, as well as incorporating a flexible linkage into the underlying metal oxide, have been proven to improve strength and resilience over their native, or non-cross-linked, counterparts without adversely affecting porosity and density. In...

Briefs: Manufacturing & Prototyping
Fabrication of an Integrated Photonic Waveguide Joint in Micromachined Silicon

High-aspect-ratio silicon structures are necessary components in many MEMS (microelectromechanical systems). Aspect ratio is defined as the ratio of the height of the structure to its lateral width. The structures are typically fabricated through bulk micromachining...

Briefs: Materials

Ti-based bulk metallic glasses (BMGs) and matrix composites (BMGMCs) are a subset of the class of materials known synonymously as amorphous metals, liquid...

Briefs: Sensors/Data Acquisition
Position Sensing and Formation Flying Using Optical Beacons

One way of imaging exoplanets around nearby stars is to use a starshade in conjunction with a space telescope. Typically, the starshade, which resembles a sunflower in outline, is ~ 30 meters in diameter. The starshade is flown about 50,000 km in front of the telescope, and when...

Articles: Aerospace

Each December, we ask our readers to cast their vote for the annual NASA Tech Briefs Readers’ Choice Product of the Year Awards. Each month, our editors choose a Product of the Month...

Briefs: Manufacturing & Prototyping

With the correct selection of composition, some bulk metallic glasses (BMGs) have been demonstrated that have excellent combinations of hardness, fracture...

Briefs: Aerospace
Modeling for Partitioned and Multicore Flight Software Systems

The current flight software approach is monolithic in nature. Every module has tentacles that reach deep within dozens of other software modules. Because of these interdependencies between modules, functionality is difficult to extract and reuse for other missions.

Briefs: Semiconductors & ICs
Modeling for Partitioned and Multicore Flight Software Systems

The current flight software approach is monolithic in nature. Every module has tentacles that reach deep within dozens of other software modules. Because of these interdependencies between modules, functionality is difficult to extract and reuse for other missions.

Briefs: Materials
Synthesis of Novel Copoly(alkyl ether imide)s With Unique Surface Properties

Copoly(alkyl ether imide)s were synthesized for the purposes of tailoring surface chemistry. Alkyl ether oligomers with amine end groups were synthesized from the hydroxyl-terminated species, and subsequently reacted with aromatic dianhydrides and diamines to make the...

Briefs: Mechanical & Fluid Systems
Algorithm Enhancements to Powered Descent Guidance Software

The Powered Descent Guidance (PDG) software provides a computationally efficient guidance algorithm for powered descent that ensures satisfaction of the governing dynamics, along with adherence to physical control and state constraints, such as avoid the surface, limit thrust magnitude...

Briefs: Materials
High-Efficiency, Easy-to-Manufacture Engineered Nanomaterials for Thermoelectric Applications

Stated generally, reducing the dimensionality of bulk-scale thermoelectric (TE) materials is theoretically and practically understood to be a viable route for maintaining/increasing phonon scattering, and maintaining/increasing electrical conductivity...

Briefs: Mechanical & Fluid Systems
Seal Design Feature for Redundancy Verification

NASA has requirements for redundant seals to protect human-occupied cabin atmospheres, as well as fluid and gas systems in space vehicles exposed to the harsh environments. Comparable requirements have been passed down to the International Space Station (ISS) Program, and are now levied on the...

Application Briefs: Lighting

Imagina US is a pioneer production company in the U.S. Hispanic TV industry that has a newly built headquarters in Miami, Florida. Owners were seeking low-wattage...

Briefs: Materials

Mechanisms are used widely in engineering applications due to their ability to translate force and movement. They are found in kinematic pairs, gears, cams, linkages,...

Briefs: Physical Sciences
Membrane Shell Reflector Segment Antenna

The mesh reflector is the only type of large, in-space deployable antenna that has successfully flown in space. However, state-of-the-art large deployable mesh antenna systems are RF-frequency-limited by both global shape accuracy and local surface quality. The limitations of mesh reflectors stem from two...

Briefs: Materials
Imidazolium-Based Polymeric Materials as Alkaline Anion-Exchange Fuel Cell Membranes

Polymer electrolyte membranes that conduct hydroxide ions have potential use in fuel cells. A variety of polystyrenebased quaternary ammonium hydroxides have been reported as anion exchange fuel cell membranes. However, the hydrolytic stability and conductivity...

Articles: Manufacturing & Prototyping

3Dprinting grabs a lot of attention — as much for its futuristic potential as for what it can do today. Send a 3D printer to the Moon, some imagine, and print out a city. Is your coffee maker dying? Just print...

Articles: Manufacturing & Prototyping
Vote for Product of the Year

Voting is officially open for the 2011 NASA Tech Briefs Readers’ Choice Product of the Year awards. You can cast your vote for one of 12 nominees featured this year as Products of the Month.

Articles: Manufacturing & Prototyping

It’s that time of year when we ask NASA Tech Briefs readers to vote for the annual Readers’ Choice Product of the Year Awards.

Application Briefs: Lighting
OSRAM Opto Semiconductors, Regensburg, Germany FormoLight Technologies, New Taipei City, Taiwan

Particularly compact Multi CHIPLEDs developed by OSRAM Opto Semiconductors raise the image quality in FormoLight...

Articles: Aerospace

In less than two weeks, “Transformers: Dark of the Moon,” has grossed more than $261 million at the box office. And along with the big-name actors involved, other stars of the movie are NASA workers,...