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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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At least 235 records · Page 13
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Optically read Coriolis vibratory gyroscope based on a silicon tuning fork

In this work, we describe the design, fabrication, and characterization of purely mechanical miniature resonating structures that exhibit gyroscopic performance comparable to that of more complex microelectromechanical systems. Compared to previous implementations of Coriolis vibratory gyroscopes, the present approach has the key advantage of using excitation and probing that do not require any on-chip electronics or electrical contacts near the resonating structure. More specifically, our design relies on differential optical readout, each channel of which is similar to the 'optical lever' readout used in atomic force microscopy. The piezoelectrically actuated stage provides highly efficient excitation of millimeter-scale tuning fork structures that were fabricated using widely available high-throughput wafer-level silicon processing. In our experiments, reproducible responses to rotational rates as low as 1.8 × 10 3° h –1 were demonstrated using a benchtop prototype without any additional processing of the raw signal. The noise-equivalent rate, ΩNER, derived from the Allan deviation plot, was found to be <0.5° h –1 for a time of 10 3 s. Despite the relatively low Q factors (<10 4 ) of the tuning fork structures operating under ambient pressure and temperature conditions, the measured performance was not limited by thermomechanical noise. In fact, the performance demonstrated in this proof-of-principle study is approximately four orders of magnitude away from the fundamental limit.

36 MATERIALS SCIENCE↗
DOE OSTI2016

Recent progress of RD53 Collaboration towards next generation Pixel Read-Out Chip for HL-LHC

This paper is a review of recent progress of RD53 Collaboration. Results obtained on the study of the radiation effects on 65 nm CMOS have matured enough to define first strategies to adopt in the design of analog and digital circuits. Critical building blocks and analog very front end chains have been designed, tested before and after 5–800 Mrad. Small prototypes of 64×64 pixels with complex digital architectures have been produced, and point to address the main issues of dealing with extremely high pixel rates, while operating at very small in-time thresholds in the analog front end. Lastly, the collaboration is now proceeding at full speed towards the design of a large scale prototype, called RD53A, in 65 nm CMOS technology.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2017

Complete 4.55-Megabase-Pair Genome of “ Candidatus Fluviicola riflensis,” Curated from Short-Read Metagenomic Sequences

ABSTRACT We report the 4.55-Mbp genome of “ Candidatus Fluviicola riflensis” ( Bacteroidetes ) that was manually curated to completion from Illumina data. “ Ca . Fluviicola riflensis” is a facultative anaerobe. Its ability to grow over a range of O 2 levels may favor its proliferation in an aquifer adjacent to the Colorado River in the United States.

59 BASIC BIOLOGICAL SCIENCES↗