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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A Method for Correcting Frequency and RoCoF Estimates of Power System Signals with Phase Steps.
Abstract not provided.
Small Signal Stability of the Western North American Power Grid with High Penetrations of Renewable Generation.
Abstract not provided.
Atypical KRAS[superscript G12R] Mutant Is Impaired in PI3K Signaling and Macropinocytosis in Pancrea
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High Resolution Silicon Arrayed Waveguide Gratings for Photonic Signal Processing Applications.
Abstract not provided.
Simultaneous few-cycle pulse generation of the depleted pump and signal from an optical parametric amplifier
Not Available
A conserved signaling pathway activates bacterial CBASS immune signaling in response to DNA damage
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Yield and Emplacement Depth Effects on Acoustic Signals from Buried Explosions in Hard Rock
Subterranean energy releases such as explosions and earthquakes may disturb the Earth-atmosphere interface, creating acoustic waves that can travel great distances. These waves provide a record of the ground motion directly above the event. The information they encode may provide critical insight into the depth and size of underground explosions, the sequence of events immediately before volcanic eruptions, and the magnitude of strong motion resulting from earthquakes. However, the effect of event size and burial depth on the resulting acoustic wave has not been explored in detail. The relationship between acoustic amplitude, frequency, and energy is investigated for a series of well-characterized underground chemical explosions in granite. Acoustic amplitude was found to vary linearly with explosive yield divided by emplacement depth. Peak acoustic frequency appears to be a function of explosive yield alone. The ratio of radiated acoustic energy to source energy had a relatively poor fit to yield, depth, and combinations thereof. These relationships suggest that acoustic analysis can be used to determine the size and depth of a buried explosion. The results presented here have particular relevance to the nuclear monitoring community, because depth is difficult to determine with seismic methods.
SIGNALS A Flexible Tool for Radiometry, Sensor Modeling, and Signal Analysis
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From Signal Processing to Signaling Traffic: Using Digital Twins to Improve Traffic and Reduce Our Carbon Footprint
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Advanced study of video signal processing in low signal to noise environments Quarterly progress report, Jun. - Sep. 1969
Probabilistic mathematical click model for optimal click suppressing frequency modulated noise thresholds
Advanced study of video signal processing in low signal to noise environments - Multi-filter phase-locked loop demodulation Quarterly progress report, Feb. - May 1970
Multi-filter phase locked loop demodulation
Vibrating element electrometer with output signal magnified over input signal by a function of the mechanical Q of the vibrating element Patent
Vibrating element electrometer producing high conversion gain by input current control of elements resonant frequency displacement amplitude
Influence of bandwidth restriction on the signal-to-noise performance of a modulated PCM/NRZ signal, part 2
Analyzing effects of bandlimiting on performance of digital transmission corrupted by additive white Gaussian noise by averaging and series expansion
Advanced study of video signal processing in low signal to noise environments
A generalized mathematical and computer model of the revised Apollo television system was developed and used to determine spectral compatibility with the overall Apollo communication system. In particular the effects of the change to commercial television format from slow-scan black and white on the principal telemetering subcarriers was analyzed. Experimental data was obtained from MSC telemetry division confirming the analytical results.
Advanced study of video signal processing in low signal to noise environments
The frame to frame correlation properties of the video process are utilized to reduce the mean squared error of the demodulated video where zero mean noise is a factor. An interpolative estimator is used for continuous estimation with the output process delayed in time by one frame. Theoretical development shows that for the model herein developed reduction of the mean squared error by 1.0 to 4.0 db possible for parameter ranges of interest. Interpolative estimation using inter-frame correlation properties of a video process is then applied to the Apollo 17 parameters to yield a model for application on that mission.
Digital Signal Conditioning for Flight Test, Volume 19 [Le Traitement du Signal Numérique pour les Essais en Vol]
This volume in the AGARD Flight Instrumentation Series provides flight test instrumentation engineers with an introduction to digital processes on aircraft. Flight test instrumentation systems are rapidly evolving from analog intensive to digital intensive systems, including the use of onboard digital computers. Topics include: measurements that are digital in origin, sampling, encoding, transmitting, and storing of data. Particular emphasis is placed on modem avionic data bus architectures and what to be aware of when extracting data from them. Some example data extraction techniques are given. Tradeoffs between digital logic families, trends in digital development, and design testing techniques are discussed. An introduction to digital filtering is also covered.
HRMS Sky Survey techniques: separating the rare interesting signal from the multitude of background signals
No abstract available