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Briefs: Information Technology
Examination and A Priori Analysis of a Direct Numerical Simulation Database for High-Pressure Turbulent Flows
A previously created direct numerical simulation (DNS) database of mixing of species under supercritical pressure has been examined and analyzed for the purpose of understanding the modeling requirements in the context of large eddy...
Briefs: Information Technology
Propellant Loading Physics Model for Fault Detection Isolation and Recovery
A Fault Detection, Isolation and Recovery (FDIR) system needs some internal concept of how the monitored system operates. This “operating concept” needs mathematical logic to represent the cause and effect relationship between constituent components of the system,...
Briefs: Information Technology
Probabilistic Guidance for Swarms of Autonomous Agents
Available guidance approaches for large numbers (i.e., swarms) of artificial agents are currently very limited. Swarms in nature (e.g., bees, birds, ants) typically contain hundreds to thousands of agents. The problem is how to mimic nature, and develop guidance laws for artificial (manmade)...
Briefs: Information Technology
Future Air-Traffic Management Concepts Evaluation Tool
In the United States, as many as 7,000 commercial and private aircraft may be in the air simultaneously at any given time and date, and the total number of commercial flights in a given 24-hour period generally exceeds 50,000. To maintain the safety and efficiency of air travel, this innovation...
Briefs: Imaging
Reducing Drift in Stereo Visual Odometry
Visual odometry (VO) refers to the estimation of vehicle motion using onboard cameras. A common mode of operation utilizes stereovision to tri angulate a set of image features, track these over time, and infer vehicle motion by computing the apparent point cloud motion with respect to the cameras. It has...
Briefs: Imaging
Resource-Constrained Application of Support Vector Machines to Imagery
Machine learning techniques have shown considerable promise for automating common visual inspection tasks. For example, Support Vector Machine (SVM) classifiers that have been learned from labeled training data deliver strong detection performance both for finding human faces in...
Briefs: Robotics, Automation & Control
Re-entry Vehicle Shape for Enhanced Performance
A vehicle entering the atmosphere of a planet will do so at hypersonic speeds and will need to decelerate and maneuver through that atmosphere while protecting its payload from excessive heating. As a consequence, the vehicle shape must be designed to provide optimal aerodynamic lift and drag...
Briefs: Physical Sciences
Until the time of this reporting, when a space vehicle required a reference signal for inertial pointing, the choices were a signal beacon from an Earth location, the Earth...
Briefs: Software
Data Acquisition and Processing Software — DAPS
DAPS was designed to support the DAWN-AIR project participating in the Genesis and Rapid Intensification Processes (GRIP) hurricane campaign. It controls the data acquisition system consisting of a scanner that directs the lidar beam, an inertial navigation system/GPS (INS/GPS) unit for monitoring...
Briefs: Sensors/Data Acquisition
Debris & Ice Mapping Analysis Tool — Database
The Debris & ICE Mapping Analysis Tool (DIMAT) system is a Web-based system that supports communication, data integration, data sharing, and problem definition/resolution through use of an integrated presentation framework for ice and debris description and analysis. It provides an integrated...
Briefs: Information Technology
Data Fusion for Global Estimation of Forest Characteristics From Sparse Lidar Data
This lidar data fusion approach is based on associating samples from sparse lidar data with groups of region objects determined by a unique image segmentation approach, HSeg (Hierar - chical Segmentation). This segmentation approach, which was previously developed by...
Briefs: Sensors/Data Acquisition
The study of driver behavior can provide a wealth of information that can be useful in the design of automobiles including active safety features and functions. There...
Briefs: Sensors/Data Acquisition
For aircraft system certification, a huge amount of testing is required to guarantee safe, robust, and error-free behavior under all operating and environmental conditions. Typically, these tests on the...
Briefs: Manufacturing & Prototyping
A gravity-independent PEM (proton exchange membrane) fuel cell stack has been developed that will operate at high-pressure H2 and O2 conditions with the...
Briefs: Test & Measurement
An ultrasonic intake airflow meter for engine testbed applications was developed. An automotive intake airflow meter must fulfill a series of requirements differentiating it from typical ultrasonic...
Briefs: Medical
Updated Facts on 2015 HCFC-225 Usage Ban
In 1974, Sherwood Rowland and Mario Molina discovered that chlorofluorocarbons (CFCs) were depleting the ozone layer, and in 1995, they received the Nobel Prize in Chemistry for this work. In response, the United Nations Environment Programme called an international conference to discuss the issue. Shortly...
Briefs: Medical
Today, medical devices are made using a variety of plastic materials and manufacturing processes. Advances in plastic processing make it possible to obtain virtually any shape, form, or function. In...
Briefs: Test & Measurement
Rapid Infrared Pixel Grating Response Testbed
A test array has been developed to measure the response of pixel-integrated infrared gratings over a wavelength range from 3 to 13 μm for multiple grating geometries. This array allows for testing and for determining the performance of an infrared focal plane array camera before resources have been...
Briefs: Test & Measurement
JWST Integrated Simulation and Test (JIST) Core
The James Webb Space Telescope (JWST) Integrated Simulation and Test (JIST) environment is a software-only system simulator that provides an environment to exercise JWST flight software subsystems and interfaces. JIST is capable of executing the unmodified flight software binaries in an operational...
Briefs: Test & Measurement
JWST IV&V Simulation and Test (JIST) Solid State Recorder (SSR) Simulator
As described in “JWST Integrated Simulation and Test (JIST) Core” (GSC-16739-1) on page 25, the JIST system is a software-based simulator that uses the James Webb Space Telescope (JWST) operational ground system, ground system command/telemetry databases, simulated flight...
Briefs: Test & Measurement
Temperature Measurement and Stabilization in a Birefringent Whispering Gallery Resonator
Whispering gallery mode (WGM) res- onators have been suggested for use as reference cavities for laser stabilization. Because of their unique properties (small size, high stability, narrow line width), such application appears to hold great promise. It is...
Briefs: Test & Measurement
Automation in Display Testing
Display devices play a vital role as the man-machine interface in most embedded domains. Display systems provide information regarding the health of safety-critical subsystems and the general status of the machine. Accuracy and precision of the information displayed is a key factor in proper machine operation. Hence,...
Briefs: Manufacturing & Prototyping
Development of a Precision Thermal Doubler for Deep Space
Thermal requirements and a need for a very flat mechanical interface led to the development of a copper doubler for the titanium vault on the Juno Spacecraft. The vault is designed to contain the science instruments on the spacecraft, protecting them from damage due to the extreme radiation...
Briefs: Manufacturing & Prototyping
Improving Friction Stir Welds Using Laser Peening
Friction stir welding (FSW) has emerged as a promising solid-state process with encouraging results, particularly when used on high-strength aerospace aluminum alloys that are generally difficult to weld. Laser peening has been applied to the mechanical and fatigue properties of welded joints. Laser...
Briefs: Manufacturing & Prototyping
Methodology of Evaluating Margins of Safety in Critical Brazed Joints
This methodology provides a guide consisting of design, testing, and structural analysis steps developed to assure positive strength margins of safety (MS) in critical brazed joints used for assembly of flight and non-flight structures.
Briefs: Electronics & Computers
Current-Controlled Output Driver for Directly Coupled Loads
Driving loads such as electric motors, relay coils, and solenoids requires a relatively large initial pull-in or start-up current from a driver in order to initiate operation of the load. To maintain continuous operation, the hold or running operating current required for a load may be 20%...
Briefs: Electronics & Computers
Interactive Inventory Monitoring
The invention is a radio frequency identity detector (RFID)-based system that assists a user in location of an item, in response to an electronic query for the status of the item. The item(s) being sought may be a book on a library shelf, an item from a store inventory, a legal or financial document, a medical...
Briefs: Electronics & Computers
Sensor for Spatial Detection of Single- Event Effects in Semiconductor-Based Electronics
Ionizing radiation has a detrimental effect on digital electronics that need to operate in extraterrestrial environments. As space missions become longer and more complex, there is a need for flight computers that can withstand harsh radiation environments...
Briefs: Materials
Li-Ion Electrolytes Containing Flame-Retardant Additives
In order to improve the safety and performance of lithium- ion cells, especially over a wide operating temperature range, a number of Li-ion electrolytes have been developed that contain flame-retardant additives in conjunction with fluorinated co-solvents to provide a safe,...
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