Results 61 to 70 of about 1,176,775 (247)
Experimental Investigation of Rotor Noise in Reverse Non-Axial Inflow
AerospaceThis paper experimentally characterises the far-field noise emissions of a rotor operating in reverse non-axial inflow conditions. Specifically, experiments were undertaken at a range of rotor tilting angles and inflow velocities to investigate the ...
Liam Hanson +3 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Two families of bTurea‐derived biradicals, bcTmols and bcTCOOKs, were prepared as polarizing agents for dynamic nuclear polarization (DNP)‐enhanced NMR through short and efficient synthetic routes. The best‐performing biradical, bcTCOOK‐M2, containing two methyl groups on the urea bridge, provided signal enhancements of up to ∼220 at 14.1 T and 100 K ...
Ancy T. Wilson +3 more
wiley +1 more source
Passive Rotor Noise Reduction Through Axial and Angular Blade Spacing Modulation
AerospaceThis study investigates the aerodynamic and aeroacoustic performance of a novel two-stage two-bladed coaxial propeller that is axially and angularly spaced.
Chingiz Arystanbekov +2 more
doaj +1 more source
Long Fluorescence Lifetime Molecular Rotors Based on the 4,4‐Dicyano‐BODIPY Core
Chemistry – A European Journal, EarlyView.Substituting fluorine with cyano groups in BODIPY‐based fluorescent molecular rotors yields viscosity‐sensitive dyes with significantly enhanced fluorescence lifetimes that can be used for viscosity mapping in living cells using FLIM microscopy. ABSTRACT Environmentally sensitive fluorescent probes with extended emission lifetimes are highly valuable ...
Yelyzaveta Denysieva +4 more
wiley +1 more source
Diagnosis of a rotor imbalance in a wind turbine based on support vector machine
AIP AdvancesRotor imbalances in wind turbines present safety risks and lead to economic losses, and a method to diagnose rotor imbalances is urgently needed. A diagnostic method for rotor imbalances is proposed in this paper. First, a signal reconstruction method is
Mingyang Chen +5 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.New insights into the mechanism of the structural transformation of cellulose into highly ordered graphitic carbon using an Fe–Ca bimetallic catalyst were obtained through complementary spectroscopic techniques, including Raman, solid‐state NMR, and Mössbauer.
Shamala Gowri Krishnan +3 more
wiley +1 more source
Chemie Ingenieur Technik, EarlyView.This study explores the process chain for reverse engineering and additive manufacturing of a water pump impeller in a process plant. Key aspects include digital twin creation, CAD redesign, material certification, Hirtisation postprocessing, and performance testing. Insights highlight iterative design for improved precision and reliability.
Michael Stadler +3 more
wiley +1 more source
Experimental Acoustic Investigation of Rotor Noise Directivity and Decay in Multiple Configurations
AerospaceIn the framework of the MATIM project, an acoustic test campaign was conducted on a platform derived from a commercial-class quadcopter within the CIRA semi-anechoic chamber.
Giovanni Fasulo +3 more
doaj +1 more source
Cytoskeleton, EarlyView.ABSTRACT Microtubules play essential roles in numerous cellular processes. All microtubules are built from the protein tubulin, yet individual microtubules can differ spatially and temporally due to their tubulin isotype composition and post‐translational modifications (PTMs).
Ezekiel C. Thomas +5 more
wiley +1 more source
On the Effect of Tip Flow on the Noise of a Ducted Rotor
International Journal of Turbomachinery, Propulsion and PowerThis study focuses on the aeroacoustic aspects of ducted rotors that could possibly be used in future electrically driven helicopter tail rotor systems. It provides a comprehensive understanding of the tip flow evolution, and of the interaction with the ...
Jose Rendón-Arredondo, Stéphane Moreau
doaj +1 more source