Results 81 to 90 of about 5,629,785 (335)
Flight-Effects on Predicted Fan Fly-By Noise [PDF]
The impact on PNLT (Perceived Noise Level, Tone corrected) and Fly-by EPNL (Effective Perceived Noise Level) when forward motion reduces the noise generated by the bypass fan of an aircraft engine was studied.
Clark, B. J., Heidmann, M. F.
core +1 more source
Advanced Functional Materials, EarlyView.Controlled laser‐drilling of embedded HfO2 membranes creates three layer nanopores with Gaussian‐shaped cavities sculptured in the supporting layers. These embedded solid‐state nanopores slow DNA translocation by 12‐fold compared to SiNx pores, enabling high‐resolution, label‐free detection of short DNAs, RNAs, and proteins.
Jostine Joby +4 more
wiley +1 more source
Characteristics of an anechoic chamber for fan noise testing [PDF]
Acoustical and mechanical design features of NASA Lewis Research Center's engine fan noise facility are described. Acoustic evaluation of the chamber, which is lined with an array of stepped wedges, is described.
Essary, J. D. +2 more
core +1 more source
Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics
Advanced Functional Materials, EarlyView.Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha +18 more
wiley +1 more source
International Journal of Environmental Health Engineering, 2015 Aims: The main goal of this paper was to evaluate the effectiveness of Helmholtz resonator in noise reduction of duct equipped with active noise control (ANC). Materials and Methods: Noise frequency band was produced by a propeller fan, which was spread
Farhad Forouharmajd +3 more
doaj +1 more source
On the effects of a separation bubble on fan noise
Journal of Sound and Vibration, 2022 Jean Al-Am +4 more
semanticscholar +1 more source
Fluctuating pressures on fan blades of a turbofan engine, flight test investigation [PDF]
Miniature pressure transducers were used to measure the fluctuating pressure on the fan blades of a JT15D engine in flight to aid in understanding fan-noise generation.
Schoenster, J. A.
core +1 more source
Integrative Approaches for DNA Sequence‐Controlled Functional Materials
Advanced Functional Materials, EarlyView.DNA is emerging as a programmable building block for functional materials with applications in biomimicry, biochemical, and mechanical information processing. The integration of simulations, experiments, and machine learning is explored as a means to bridge DNA sequences with macroscopic material properties, highlighting current advances and providing ...
Aaron Gadzekpo +4 more
wiley +1 more source
An overview of testing methods for aeroengine fan noise
Progress in Aerospace Sciences, 2021 Huanxian Bu, Xun Huang, Xin Zhang
semanticscholar +1 more source
Reduction of fan noise in an anechoic chamber by reducing chamber wall induced inlet flow disturbances [PDF]
The difference between the flight and ground static noise of turbofan engines presents a significant problem in engine noise testing. The additional noise for static testing has been attributed to inlet flow disturbances or turbulence interacting with ...
Dittmar, J. H. +2 more
core +1 more source