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Briefs: Manufacturing & Prototyping
Microfabrication of a High-Throughput Nanochannel Delivery/Filtration System
A microfabrication process is proposed to produce a nanopore membrane for continuous passive drug release to maintain constant drug concentrations in the patient’s blood throughout the delivery period. Based on silicon microfabrication technology, the dimensions of the...
Briefs: Manufacturing & Prototyping
Monolithic Flexure Pre-Stressed Ultrasonic Horns
High-power ultrasonic actuators are generally assembled with a horn, backing, stress bolt, piezoelectric rings, and electrodes. The manufacturing process is complex, expensive, difficult, and time-consuming. The internal stress bolt needs to be insulated and presents a potential internal discharge...
Briefs: Manufacturing & Prototyping
Improved Design and Fabrication of Hydrated-Salt Pills
A high-performance design, and fabrication and growth processes to implement the design, have been devised for encapsulating a hydrated salt in a container that both protects the salt and provides thermal conductance between the salt and the environment surrounding the container. The unitary...
Briefs: Electronics & Computers
Wheel-based sensors for detection of ice on roads and approximate measurement of the thickness of the ice are under development. These sensors could be used to alert drivers to hazardous local icing...
Briefs: Electronics & Computers
Broadband Via-Less Microwave Crossover Using Microstrip- CPW Transitions
The front-to-back interface between microstrip and CPW (coplanar waveguide) typically requires complex fabrication or has high radiation loss. The microwave crossover typically requires a complex fabrication step. The prior art in microstrip-CPW transition requires a physical...
Briefs: Electronics & Computers
Cryogenic Quenching Process for Electronic Part Screening
The use of electronic parts at cryogenic temperatures (
Briefs: Software
G-DYN Multibody Dynamics Engine
G-DYN is a multi-body dynamic simulation software engine that automatically assembles and integrates equations of motion for arbitrarily connected multibody dynamic systems.
Briefs: Software
Multibody Simulation Software Testbed for Small-Body Exploration and Sampling
G-TAG is a software tool for the multibody simulation of a spacecraft with a robotic arm and a sampling mechanism, which performs a touch-and-go (TAG) maneuver for sampling from the surface of a small celestial body. G-TAG utilizes G- DYN, a multi-body simulation engine...
Briefs: Software
Propulsive Reaction Control System Model
This software models a propulsive reaction control system (RCS) for guidance, navigation, and control simulation purposes. The model includes the drive electronics, the electromechanical valve dynamics, the combustion dynamics, and thrust. This innovation follows the Mars Science Laboratory entry reaction...
Briefs: Communications
Licklider Transmission Protocol Implementation
This software is an implementation of the Licklider Transmission Protocol (LTP), a communications protocol intended to support the Bundle Protocol in Delay-Tolerant Network (DTN) operations. LTP is designed to provide retransmission- based reliability over links characterized by extremely long message...
Briefs: Software
Core Recursive Hierarchical Image Segmentation
The Recursive Hierarchical Image Segmentation (RHSEG) software has been repackaged to provide a version of the RHSEG software that is not subject to patent restrictions and that can be released to the general public through NASA GSFC’s Open Source release process. Like the Core HSEG Software Package,...
Briefs: Mechanical & Fluid Systems
Pressure Regulator With Internal Ejector Circulation Pump, Flow and Pressure Measurement Porting, and Fuel Cell System Integration Options
An advanced reactant pressure regulator with an internal ejector reactant circulation pump has been developed to support NASA’s future fuel cell power systems needs. These needs include reliable and safe...
Briefs: Mechanical & Fluid Systems
Two-Stage Centrifugal Fan
Fan designs are often constrained by envelope, rotational speed, weight, and power. Aerodynamic performance and motor electrical performance are heavily influenced by rotational speed. The fan used in this work is at a practical limit for rotational speed due to motor performance characteristics, and there is no more space...
Briefs: Mechanical & Fluid Systems
Combined Structural and Trajectory Control of Variable-Geometry Planetary Entry Systems
Some of the key challenges of planetary entry are to dissipate the large kinetic energy of the entry vehicle and to land with precision. Past missions to Mars were based on unguided entry, where entry vehicles carried payloads of less than 0.6 T and landed...
Briefs: Materials
Temperature-Sensitive Coating Sensor Based on Hematite
A temperature-sensitive coating, based on hematite (iron III oxide), has been developed to measure surface temperature using spectral techniques. The hematite powder is added to a binder that allows the mixture to be painted on the surface of a test specimen. The coating dynamically changes its...
Briefs: Materials
Detection of Carbon Monoxide Using Polymer-Carbon Composite Films
A carbon monoxide (CO) sensor was developed that can be incorporated into an existing sensing array architecture. The CO sensor is a low-power chemiresistor that operates at room temperature, and the sensor fabrication techniques are compatible with ceramic substrates.
Briefs: Materials
Substituted Quaternary Ammonium Salts Improve Low-Temperature Performance of Double-Layer Capacitors
Double-layer capacitors are unique energy storage devices, capable of supporting large current pulses as well as a very high number of charging and discharging cycles. The performance of double-layer capacitors is highly dependent on the nature of...
Briefs: Energy
Economics is a key factor for application of organic light emitting diodes (OLED) in general lighting relative to OLED flat panel displays that can handle...
Briefs: Materials
Standardization of a Volumetric Displacement Measurement for Two-Body Abrasion Scratch Test Data Analysis
A limitation has been identified in the existing test standards used for making controlled, two-body abrasion scratch measurements based solely on the width of the resultant score on the surface of the material. A new, more robust method is...
Briefs: Materials
Sustainably Sourced, Thermally Resistant, Radiation Hard Biopolymer
This material represents a breakthrough in the production, manufacturing, and application of thermal protection system (TPS) materials and radiation shielding, as this represents the first effort to develop a non-metallic, nonceramic, biomaterial-based, sustainable TPS with the...
Briefs: Physical Sciences
Future astrophysics and planetary experiments are expected to require large focal plane arrays with thousands of detectors. Feedhorns have excellent performance, but their mass, size,...
Briefs: Physical Sciences
Validating Phasing and Geometry of Large Focal Plane Arrays
The Kepler Mission is designed to survey our region of the Milky Way galaxy to discover hundreds of Earth-sized and smaller planets in or near the habitable zone. The Kepler photometer is an array of 42 CCDs (charge-coupled devices) in the focal plane of a 95-cm Schmidt camera onboard the...
Briefs: Physical Sciences
180-GHz Interferometric Imager
A 180-GHz interferometric imager uses compact receiver modules, combined high- and low-gain antennas, and ASIC (application specific integrated circuit) correlator technology, enabling continuous, all-weather observations of water vapor with 25-km resolution and 0.3-K noise in 15 minutes of observation for numerical...
Briefs: Physical Sciences
Maturation of Structural Health Management Systems for Solid Rocket Motors
Concepts of an autonomous and automated space-compliant diagnostic system were developed for conditioned- based maintenance (CBM) of rocket motors for space exploration vehicles. The diagnostic system will provide real-time information on the integrity of critical structures...
Briefs: Information Technology
Achieving Exact and Constant Turnaround Ratio in a DDS-Based Coherent Transponder
A report describes a non-standard direct digital synthesizer (DDS) implementation that can be used as part of a coherent transponder so as to allow any rational turnaround ratio to be exactly achieved and maintained while the received frequency varies. (A coherent...
Briefs: Information Technology
Surface Modeling to Support Small-Body Spacecraft Exploration and Proximity Operations
In order to simulate physically plausible surfaces that represent geologically evolved surfaces, demonstrating demanding surface-relative guidance navigation and control (GN&C) actions, such surfaces must be made to mimic the geological processes themselves....
Briefs: Physical Sciences
The single-photon counting imaging sensor is typically an array of silicon Geiger-mode avalanche photodiodes that are monolithically integrated with CMOS (complementary metal oxide...
Briefs: Photonics/Optics
Qualification of Fiber Optic Cables for Martian Extreme Temperature Environments
Means have been developed for enabling fiber optic cables of the Laser Induced Breakdown Spectrometer instrument to survive ground operations plus the nominal 670 Martian conditions that include Martian summer and winter seasons. The purpose of this development was to...
Briefs: Photonics/Optics
Transverse Pupil Shifts for Adaptive Optics Non-Common Path Calibration
A simple new way of obtaining absolute wavefront measurements with a laboratory Fizeau interferometer was recently devised. In that case, the observed wavefront map is the difference of two cavity surfaces, those of the mirror under test and of an unknown reference surface on...
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