Keyword: Conductivity

Briefs: Mechanical & Fluid Systems
Aluminum Gas Tungsten Arc Orbital Tube Welding

JPL has been hand-welding aluminum tubing for decades in support of flight programs and ground support equipment, including thermal plates and shrouds. This hand-welding process is time-consuming, cumbersome, difficult, and unreliable in terms of repeatability and success, which leads to leaks,...

Briefs: Electronics & Computers
Semiconductor Nanomembrane-Based Flight Sensors and Arrays

There are two broad classes of methods for measuring skin friction (or wall shear): indirect and direct. The direct methods generally employ a movable element of the actual surface surrounded by a very small gap and connected to some type of flexure. One then measures the displacement of...

Briefs: Materials
Aerogel-Filled Foam Core Insulation for Cryogenic Propellant Storage

Current cryogenic insulation materials suffer from various drawbacks including high cost and weight, lack of structural or load-bearing capability, fabrication complexity, and property anisotropy. A need clearly exists for lightweight thermal insulation that is isotropic and...

Articles: Aerospace

Thermally conductive adhesives are uniquely qualified to meet the increasingly diverse requirements of advanced electronics systems. From their...

Briefs: Sensors/Data Acquisition

Position feedback sensors for hydraulic or pneumatic cylinders have used one of three traditional technologies: magnetostrictive, variable resistance, and variable inductance. As the...

Briefs: Sensors/Data Acquisition
Optical Hotspot Conductive Fluid Flow Sensor

The Optical Hotspot Flow Sensor (OHFS) enables optical measurement of electrically conductive liquid metal flow rate by exploiting the electrically conductive nature of liquid metals or any other conductive fluid to enable thermal tagging of liquid flow in tubes (US Patent 7,409,875). It is well...

Briefs: Materials

Modern mechanical carbon materials are being used in a wide variety of applications, including aircraft gear boxes, air turbine motor starters, and main shaft seals for both aircraft...

Briefs: Materials

NASA vehicles using cryogenic propellants and systems need improved cryogenic storage and transfer, including insulation for cryogenic transfer/feed lines....

Briefs: Materials
Compliant Electrode and Composite Materials for Piezoelectric Wind and Mechanical Energy Conversion

Thin film, piezoelectric materials generate a small voltage whenever they are deformed, suggesting that they are suitable for tapping energy from freely available resources, such as the wind. Yet their low-energy production levels and lack of...

Articles: Motion Control

When first introduced, brushless DC motors, despite their many advantages, were cast as a costly alternative to brush-commutated motors, and were typically only specified for low-power...

Briefs: Materials
Lightweight, Flexible, Energy-Manageable Polymer Nanocomposites

Solar energy has attracted keen attention because it is a unique, clean, and sustainable energy resource. It is also widely utilized as a power source in space exploration. A lightweight, durable, deployable, and highly efficient all polymer-based solar power panel was developed...

Briefs: Materials
Lightweight, High-Strength Nanocomposite Magnesium for Radiators

The next generation of radiators will be designed using a composite with the combination of the lowest density, highest thermal conductivity, and highest strength. A scalable, low-cost process was developed to advance state-of-the-art metal matrix thermal conductors to reach a...

Briefs: Manufacturing & Prototyping

Fiber metal laminates (FMLs) are multicomponent materials utilizing metals, fibers, and matrix resins. Tailoring their properties is readily achievable by varying one or more of these...

Briefs: Manufacturing & Prototyping
Method to Produce Copper Nanowires for Interconnect Applications

Copper replaced aluminum nearly two decades ago as interconnect material in integrated circuit manufacturing due to its better electrical conductivity. The size of the interconnect wire has been steadily decreasing as Moore’s law has been progressing through various feature size...

Briefs: Manufacturing & Prototyping
All-Organic Electroactive Device Fabricated with Single- Wall Carbon Nanotube Film Electrode

A novel, all-organic electroactive device system has been fabricated with a single-wall carbon nanotube (SWCNT) film used as an alternative electrode. This system was fabricated with LaRC-Electro Active Polymer (LaRC-EAP) active layer and the SWCNT films...

Briefs: Manufacturing & Prototyping
Making Flexible Ablators that are Flexible Char Formers

An approach was developed for making low-density, flexible ablators for a thermal protection system (TPS) from a flexible fibrous carbon substrate and a polymer resin. The material is foldable and stowable, and can be deployed in space without compromising performance. In addition, the...

Briefs: Materials
Fibers of Aligned Single-Wall Carbon Nanotubes and Process for Making the Same

Single-wall carbon nanotubes (SWNTs) are fullerenes of closed-cage carbon molecules typically arranged in hexagons and pentagons. Commonly known as “buckytubes,” these cylindrical carbon structures have extraordinary properties, including high electrical and...

Briefs: Robotics, Automation & Control

Part 1 of this article introduced a phenomenon called power-on/off glitch. The example discussed the impact of this phenomenon on a motor control system. We limited our analysis to a...

Briefs: Materials
White, Electrically Conductive, Radiation-Stable, Thermal Control Coating

A highly reflective, white conductive coating system was developed using a layered approach with a combination of commercially available white conductive pigments within a conductive binder system. The top coating is a space-stable, radiation-resistant, highly reflective...

Briefs: Materials
Plasma-Assisted Thin Film Coatings to Create Highly Hydrophobic Porous Structures

Gas-distribution layers (GDLs) are water-management structures used in fuel cells and electrolyzers. GDLs are critical components that prevent flooding of the fuel cell electrode by product water, thus preserving open channels for reactant gas to reach the...

INSIDER: Electronics & Computers

A door has been opened to low-power off/on switches in micro-electro- mechanical systems (MEMS) and nanoelectronic devices, as well as ultrasensitive bio-sensors, with the...

Briefs: Materials
Modeling Transmission Effects on Multilayer Insulation

Recent experimental results within the NASA community have shown apparent degradation in the performance of multilayer insulation (MLI) when used in low-temperature applications, e.g., in liquid hydrogen tanks. There was speculation that this degradation was due to the appearance of...

Briefs: Materials
Innovative, Low-CTE, Lightweight Structures with Higher Strength

A series of lightweight (density below 2.0 gm/cm3) composites has been manufactured that have controllable properties. The core composite has been improved to provide higher strength (similar to aluminum), extremely low density, receptivity to exterior coatings, and...

Briefs: Energy
Negative Dielectric Constant Material Based on Ion-Conducting Materials

Metamaterials, or artificial negative index materials (NIMs), have generated great attention due to their unique and exotic electromagnetic properties. A negative dielectric constant material, which is an essential key for creating the NIMs, was developed by doping ions into...

Briefs: Sensors/Data Acquisition

This ultrasonic, pulse-echo probe can sustain as high as 250 °C, and uses a piezoelectric transducer to generate and receive the ultrasonic pulses. The...

Briefs: Sensors/Data Acquisition
Wireless Electrical Devices Using Floating Electrodes

A wireless, connection-free, open circuit technology can be used for developing electrical devices like sensors that need no physical contact with the properties being measured. At the core of the technology is the SansEC (Sans Electrical Connections) circuit that is damage-resilient and...

Briefs: Test & Measurement
Guarded Flat Plate Insulation Test Cryostat

The guarded flat plate insulation test cryostat (Cryostat-500) is a boil-off calorimeter comprising a flat-bottom test apparatus for measuring the absolute thermal performance of an insulation test article. Typical dimensions allow accepting test specimens 200 mm in diameter by up to 30 mm thick. The...

Briefs: Manufacturing & Prototyping
Multimode, Fiber-Coupled, Tungsten Silicide, Superconducting Nanowire Single-Photon Detector Array

The superconducting nanowire single-photon detector (SNSPD) arrays created in this innovation were fabricated using a WSi nanowire process. A gold mirror layer is deposited on an oxidized silicon wafer, and amorphous-state WSi is sputtered from a...

Briefs: Information Technology

A lake and shore sampling and sample distribution system was developed for a Titan lake environment (93.7 K, in liquid hydrocarbons). The Titan Lake and Shore Sampler (TLASS) would enable the chemical analysis of...