Results 61 to 70 of about 147,257 (198)

Helicopter rotor trailing edge noise [PDF]

A two dimensional section of a helicopter main rotor blade was tested in an acoustic wind tunnel at close to full-scale Reynolds numbers to obtain boundary layer data and acoustic data for use in developing an acoustic scaling law and testing a first ...
Amier, R. K., Schlinker, R. H.
core   +1 more source

Acoustic Nature of the Boson Peak in Vitreous Silica

, 1999
New temperature dependent inelastic x-ray (IXS) and Raman (RS) scattering data are compared to each other and with existing inelastic neutron scattering data in vitreous silica (v-SiO_2), in the 300 - 1775 K region.
Benassi, P., Cunsolo, A., Fontana, A., Krisch, M., Masciovecchio, C., Mazzacurati, V., Mermet, A., Monaco, G., Montagna, M., Rossi, F., Ruocco, G., Sampoli, M., Scopigno, T., Sette, F., Signorelli, G., Verbeni, R.   +15 more
core   +1 more source

Acoustic Estimation of Resonance Frequency and Sonodestruction of SonoVue Microbubbles

Archives of Acoustics, 2015
Acoustic properties of ultrasound (US) contrast agent microbubbles (MB) highly influence sonoporation efficiency and intracellular drug and gene delivery. In this study we propose an acoustic method to monitor passive and excited MBs in a real time.
Rytis JURKONIS, Nerijus LAMANAUSKAS, Saulius SATKAUSKAS   +2 more
doaj   +1 more source

Experimental study of the thermal-acoustic efficiency in a long turbulent diffusion-flame burner [PDF]

An acoustic source/propagation model is used to interpret measured noise spectra from a long turbulent burner. The acoustic model is based on the perturbation solution of the equations describing the unsteady one-dimensional flow of an inviscid ideal gas
Mahan, J. R.
core   +1 more source

Insight into the Structural and Dynamical Processes of Peptides by Means of Vibrational and Ultrasonic Relaxation Spectroscopies, Molecular Docking, and Density Functional Theory Calculations

ChemEngineering
We report a detailed investigation of the vibrational modes, structure, and dynamics of glutathione (GSH) solutions using ultrasonic relaxation spectroscopy, FT-IR vibrational spectroscopy, and electronic absorption measurements.
Afrodite Tryfon, Panagiota Siafarika, Constantine Kouderis, Angelos G. Kalampounias   +3 more
doaj   +1 more source

Acoustic damping in Li$_2$O-2B$_2$O$_3$ glass observed by inelastic x-ray and optical Brillouin scattering

, 2005
The dynamic structure factor of lithium-diborate glass has been measured at several values of the momentum transfer $Q$ using high resolution inelastic x-ray scattering. Much attention has been devoted to the low $Q$-range, below the observed Ioffe-Regel
B. Rufflé, Buchenau, Buchenau, Courtens, Devaud, E. Courtens, Foret, G. Guimbretière, G. Monaco, Graebner, Gurevich, Hunklinger, Ioffe, Lorösch, Matic, Matic, Parshin, R. Vacher, Rat, Rat, Rufflé, Rufflé, Ruocco, Vacher, Vacher, Vacher, Vacher, Zeller, Čiplys   +28 more
core   +1 more source

Prediction of aortic valve regurgitation after continuous-flow left ventricular assist device implantation using artificial intelligence trained on acoustic spectra. [PDF]

J Artif Organs, 2021
Misumi Y, Miyagawa S, Yoshioka D, Kainuma S, Kawamura T, Kawamura A, Maruyama Y, Ueno T, Toda K, Asanoi H, Sawa Y.   +10 more
europepmc   +1 more source

Measurement of far field combustion noise from a turbofan engine using coherence functions [PDF]

Coherence measurements between fluctuating pressure in the combustor of a YF-102 turbofan engine and far-field acoustic pressure were made. The results indicated that a coherent relationship between the combustor pressure and far-field existed only at ...
Karchmer, A. M., Montegani, F. J., Reshotko, M.   +2 more
core   +1 more source

Estimating Lab-Quake Source Parameters: Spectral Inversion from a Calibrated Acoustic System

Sensors
Laboratory acoustic emissions (AEs) serve as small-scale analogues to earthquakes, offering fundamental insights into seismic processes. To ensure accurate physical interpretations of AEs, rigorous calibration of the acoustic system is essential. In this
Federico Pignalberi, Giacomo Mastella, Carolina Giorgetti, Marco Maria Scuderi   +3 more
doaj   +1 more source

Atmospheric Sound Propagation over Rough Sea: Numerical Evaluation of Equivalent Acoustic Impedance of Varying Sea States

Acoustics
This work presents a numerical study on atmospheric sound propagation over rough water surfaces with the aim of improving predictions of sound propagation over long distances.
Andrea Vecchiotti, Teresa J. Ryan, Joseph F. Vignola, Diego Turo   +3 more
doaj   +1 more source