Results 81 to 90 of about 35,280 (262)
Advanced Functional Materials, EarlyView.Two‐photon grayscale lithography (2GL) enables high‐speed and precise 3D printing of thermolyzed silica glass microstructures with optical‐grade surface quality, high quality factors, and mechanical strength utilizing a custom‐made pre‐glass resist based on polyhedral oligomeric silsesquioxane (POSS) modified with a high‐sensitivity Norrish type II ...
Jonathan L. G. Schneider +4 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 Presentation of Data on Fan Noise [PDF]
The Journal of the Acoustical Society of America, 1959 The form of the relation among: speed of rotation, size of fan, flow rate, spectral density of radiated sound power, and sound frequency is derivable from simple considerations of dimensions and acoustic theory. Examples are given.
openaire +1 more source
Operando Tracking of Oxygen‐Vacancy Dynamics and Negative Capacitance in Ca‐Doped BiFeO3
Advanced Functional Materials, EarlyView.Operando electrochemical impedance spectroscopy, combined with electrocoloration, enables a direct correlation between real‐space ionic redistribution and the corresponding frequency‐domain electrical response. In lateral Ca‐doped BiFeO3 devices, time‐resolved impedance snapshots capture the evolution from bulk‐dominated mixed conduction to an ...
Jeonghun Suh +3 more
wiley +1 more source
Noise Test and Optimization of Auxiliary Converter for Metro Vehicle
机车电传动, 2018 In order to reduce the noise of auxiliary converter in metro vehicle, noise characteristics of the auxiliary converter were obtained through the vibration and noise test in different working conditions.
DING Jie +3 more
doaj
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018 A computational investigation of aerodynamic characteristics of a model ultrahigh-bypass ratio counter-rotating fan (m=20) developed at CIAM within the framework of the European Project COBRA (Innovative Counter Rotating Fan System for High Bypass Ratio ...
Ya. M. Druzhinin +2 more
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Volatile Relay Biosensing and Mobile Phone Imaging for Detection of Influenza Virus
Advanced Functional Materials, EarlyView.Detection of volatile organic compounds is performed via a coupled enzymatic assay with mobile phone detection of the signal. Specific application demonstrated herein is the detection of influenza virus, across multiple levels of biological complexity, up to patient‐derived samples.
Dante G. Andersen +7 more
wiley +1 more source
Advanced Functional Materials, EarlyView.This work introduces an ultrafast thermal shock strategy to synthesize a CuNiSnLa medium‐entropy metallic glass (MEMG). The rapid heating and cooling process generates a robust, highly active catalyst for electrocatalytic nitrate reduction to ammonia (NRA).
Hongbo Chen +7 more
wiley +1 more source
International Journal of Turbomachinery, Propulsion and PowerFor modern axial fans optimized for low self-noise, additional noise emission from guard grilles mounted downstream of the fan can become one of the dominant sources of sound.
Sandra Hub, Frieder Lörcher
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Advanced Functional Materials, EarlyView.Contrary to conventional expectations, the bulk photovoltaic effect in CuCrP2S6 is enhanced rather than suppressed upon transitioning into the crystallographically centrosymmetric phase. Dynamic Cu‐ion disorder creates transient polar states, which substantially amplifies zero‐bias photocurrent (shift‐current) generation, establishing dynamic symmetry ...
Ryoga Murata, Takao Sasagawa
wiley +1 more source