Sources and characteristics of interior noise in general aviation aircraft [PDF]
A field study was conducted to examine the interior noise characteristics of a general aviation aircraft. The goals were to identify the major noise sources and their relative contribution and to establish the noise transmission paths and their relative ...
Catherines, J. J., Jha, S. K.
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Digital Actuation Control of Soft Robotic Origami With Self‐Folding Liquid Crystal Elastomer Hinges
Advanced Functional Materials, EarlyView.Self‐folding soft‐rigid hybrid robotic origami is enabled by liquid crystal elastomer actuators with embedded Joule heating and closed‐loop digital control. Digitally addressable hinges provide reversible and programmable transitions between distinct folded states while maintaining actuation performance at high cycle counts (over 1500).
David C. Bershadsky +3 more
wiley +1 more source
The Analysis of Engine Noise and Noise Reduction Measures
DEStech Transactions on Computer Science and Engineering, 2021 Zhibin Wang +5 more
openaire +2 more sources
The stirling engine for vehicle propulsion [PDF]
The performance data of experimental Stirling engines are considered along with questions of exhaust-gas composition, engine noise, engine volume and weight, engine control, and the engine-starting process.
Kuhlman, P.
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Magnetic Force Microscopy Signatures of Higher‐Order Skyrmions and Antiskyrmions
Advanced Functional Materials, EarlyView.Magnetic force microscopy operated under vacuum conditions enables the qualitative identification of higher‐order skyrmions and antiskyrmions in Co/Ni multilayers at room temperature. Distinct stray‐field contrast signatures arise from vertical Bloch lines and complex domain‐wall configurations.
Sabri Koraltan +8 more
wiley +1 more source
Advanced Functional Materials, EarlyView.Covalent organic frameworks (COFs) with metals have been recognized as versatile platforms for photocatalytic CO2 reduction (CO2PRR). Herein, an overview of metal integration strategies for COFs is systematically summarized. Regulatory mechanisms and structure–activity relationships between metal integration and COF‐based CO2PRR are emphasized.
Jie He +5 more
wiley +1 more source
Low-frequency rear quadrant noise of a turbojet engine with exhaust duct muffling [PDF]
A J-65 engine was run with a tuned sound-absorbing exhaust duct to study the internal and jet components of rear quadrant noise. Full muffler, hard wall duct, and regular production engine configurations were tested.
Minner, G. L., Woodward, R. P.
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Imaging of Biphoton States: Fundamentals and Applications
Advanced Functional Materials, EarlyView.Quantum states of two photons exhibit a rich polarization and spatial structure, which provides a fundamental resource of strongly correlated and entangled states. This review analyzes the physics of these intriguing properties and explores the various techniques and technologies available to measure them, including the state of the art of their ...
Alessio D'Errico, Ebrahim Karimi
wiley +1 more source
Model predictive control with adaptive Kalman filter for premixed turbocharged natural gas engine. [PDF]
Sci RepXiong W, Gong Q, Huang S, Ye J, Xu J.
europepmc +1 more source
Acoustic and aerodynamic performance of a 6-foot-diameter fan for turbofan engines. 2 - Performance of QF-1 fan in nacelle without acoustic suppression [PDF]
Low noise turbofan engine without aerodynamic blade ...
Balombin, J. R. +2 more
core +1 more source