Results 211 to 220 of about 89,893 (265)

Arterial Blood‐Mediated Deep‐Tissue Photoacoustic Oximetry

Advanced Science, EarlyView.
The arterial prior method (APM+) for photoacoustic oximetry is introduced, which leverages the high arterial blood oxygenation to calibrate the fluence at the artery and estimate the oxygenation of the surrounding tissue, thus circumventing the spectral coloring problem. APM+’s accuracy and consistency are shown in a series of phantom and in vivo human
Karteekeya Sastry, Junhao Zhu, Joshua Olick‐Gibson, Li Lin, Lei Li, Jigmi Basumatary, Yang Zhang, Lihong V. Wang   +7 more
wiley   +1 more source

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Basic Acoustic Properties of Microbubbles

Echocardiography, 2002
Small (encapsulated) gas bubbles in a contrast medium react to an external oscillating pressure field with volume pulsations. Depending on the magnitude of the ultrasound wave, the vibrations will be related either linearly or nonlinearly to the applied acoustic pressure.
Jong, Nico, Bouakaz, A, Frijlink, ME (Martijn)   +2 more
openaire   +3 more sources

Acoustic Properties of the Nasal Tract

Phonetica, 1976
Abstract Sweep frequency measurements of the transfer function of nasals and nasalized vowels have been found to show a more complex pole-zero pattern than can be predicted with a traditional model of the nasal tract which consists of two parallel tubes coupled to the oral cavities.
J, Lindqvist-Gauffin, J, Sundberg
openaire   +2 more sources

Acoustic properties of gallium selenide

Physical Review B, 1995
We investigate the effect of illumination on the velocity of the ${\mathit{L}}_{\mathrm{\ensuremath{\perp}}}$ and ${\mathrm{FT}}_{\mathrm{\ensuremath{\perp}}}$ acoustic-wave propagation along layers of \ensuremath{\varepsilon}-GeSe [in the (0001) plane]. Frequency and temperature dependences and also relative changes of various acoustic-wave velocities
, Abutalybov, , Dzhafarova, , Ragimova
openaire   +2 more sources

Acoustical properties of the human skull

The Journal of the Acoustical Society of America, 1978
The acoustical properties insertion loss, reflection loss, and sound speed were measured on a series of fresh and subsequently formalin immersed human skulls. Measurements were made in the frequency range from 0.25 to 6 MHz. Most studies were restricted to an upper frequency limit of 2.2 MHz.
F J, Fry, J E, Barger
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Physical and acoustical properties of zooplankton

The Journal of the Acoustical Society of America, 1982
The target strengths of marine zooplankton are often predicted from fluid sphere scattering models. These models require estimation of certain physical properties of the individual zooplankters: radius of the equivalent sphere, mass density, and either sound speed or compressibility.
C F, Greenlaw, R K, Johnson
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Properties of Acoustic Reflex Adaptation

Annals of Otology, Rhinology & Laryngology, 1977
The dynamic behavior of the acoustic reflex to continuous sinusoidal stimuli was investigated. The major purpose was to determine the temporal characteristics of reflex adaptation as frequency (0.5, 1.0, 2.0, 3.0, 4.0 kHz) and suprathreshold level (6, +12, +18 dB re reflex threshold) were systematically varied.
H, Kaplan, S, Gilman, D D, Dirks
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Acoustic emission properties of callus

Medical & Biological Engineering & Computing, 1981
11 New Zealand white rabbits with 45 degree midshaft oblique osteotomies were stressed in shear while monitoring acoustic emission events. The ringdown counting method demonstrated a reasonably reproducible pattern when counting events against load; that is, each fracture remained essentially quiet until over 50% of load to failure had been applied ...
P J, Nicholls, E, Berg
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Acoustical properties of “FABRASORB” acoustical fabrics

The Journal of the Acoustical Society of America, 1982
“FABRASORD” acoustical fabric was developed by CHEMFAB about six years ago to provide a solution to the poor acoustics (U. S. Patent No. 4,152,474) within fabric structures. Based on woven fiberglass and polytetrafluoreotylene (PTFE) resins, it is a natural companion to “SHEERFILL” architectural fabrics which have enabled fabric structures to meet all ...
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ACOUSTIC PROPERTIES OF SOYBEANS

Transactions of the ASAE, 1990
ABSTRACT Acoustic transmission and impact force response methods were investigated for classification of soybeans. The transmission method was slow and not suitable for real-time application. A polynomial was fitted to the deconvolved frequency spectrum of acoustic impulse data for soybeans.
Misra, Manjit, Koerner, B., Pate, A., Burger, C.   +3 more
openaire   +2 more sources