A method of parameterizing the coefficients of a dynamical system based of a proper orthogonal decomposition (POD) representing the flow dynamics of a viscous fluid has been introduced. (A brief description of POD is presented in the immediately preceding article.) The present...

Confidence-based Feature Acquisition (CFA) is a novel, supervised learning method for acquiring missing feature values when there is missing data at both training (learning) and test (deployment) time. To train a machine learning classifier, data is encoded with a series of input features describing each item....

The Tin Whisker Metal Vapor Arcing Risk Assessment Tool has been designed to evaluate the risk of metal vapor arcing and to help facilitate a decision toward a researched risk disposition. Users can evaluate a system without having to open up the hardware. This process allows for investigating components at...

Nitrous oxide/paraffin (N2OP) hybrid rocket engines have been invented as alternatives to other rocket engines — especially those that burn granular, rubbery solid fuels consisting largely of hydroxyl-terminated polybutadiene (HTPB). Originally intended for use in launching spacecraft, these engines...

Dr. Gary Hunter, who joined NASA in 1990, is an expert in the design, fabrication, and testing of sensors, especially chemical species gas sensors. In 1995 and 2005, he led the development of sensor systems that won R&D...

The Antenna and Optical Systems Branch at NASA’s Glenn Research Center is working on many innovations in nanotechnology for use in communications applications. One such emerging field of nanotechnology receiving significant attention for its promising results is nanoionics....

Stevrin & Partners The PicoEndo endoscope is the smallest tethered endoscope in the world (4.5mm × 12.0mm). It is also inexpensive enough to use and discard. The PicoEndo system is applicable to medical tasks such as photographing the surface of the esophagus, and to applications in any industry that needs to place a...

AIST Innovations Experiments with holograms have led to a thin-film flat-plate lens that has a periodic (layered) structure and that is capable of a resolution of 100 nm or finer. The flat lens provides excellent image-forming characteristics by the incidence of light having a...

A company seeks alternative methods for sawing, drilling, boring, cutting, or otherwise separating materials such as wood, metal, and composites. When compared to conventional sawing, drilling, boring, or other cutting methods, the new method should be faster and easier; provide a cleaner cut in...

A company seeks a near-field ultra-high-frequency (UHF) RFID system solution that can communicate in near-field while keeping the field region localized so that far-field talks can be suppressed. A new near-field UHF RFID reader antenna is sought that has strong magnetic near-field, but small far-field gain and beam...

This week's question concerns the U.S.'s ongoing efforts to encourage healthier eating. States across the nation are beginning to impose "sin taxes" on fat and sugar to dissuade people from eating junk food. The thought is that if you make it cheaper, people will eat more of it, more expensive and people...

PseudoDiversity is a method of recovering the wavefront in a sparse- or segmented-aperture optical system typified by an interferometer or a telescope equipped with an adaptive primary mirror consisting of controllably slightly moveable segments. (PseudoDiversity should not be confused...

A computer program has been written as a tool for developing optical pulse-position-modulation (PPM) receivers in which photodetector outputs are fed to analog-to-digital converters (ADCs) and all subsequent signal processing is performed digitally. The program can be used, for example, to simulate an...