Ultrasonic wave transport in resonant emulsions made of slow or fast droplets
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Bibliographic record
Abstract
The key transport parameters of acoustic waves travelling in disordered media are studied through ultrasonic experiments on monodisperse resonant emulsions. Through accurate measurements of both ballistic and diffusive transport over a wide range of frequencies, we show that the group velocity of the ballistic component may differ significantly from the energy velocity of the diffusive waves, in particular in the vicinity of scattering resonances. Moreover, we demonstrate the crucial role played by the refractive acoustic index of the droplets relative to the surrounding media by studying emulsions made of “slow” fluorinated oil droplets or “fast” liquid metallic droplets dispersed in a water-based gel. Our observations are successfully explained by theories based on independent scattering approximations relevant for these diluted media. Effects of droplet resonances in the diffusive regime are also discussed giving a complete study of the energy velocity of scalar waves in strongly scattering media. B. Tallon, T. Brunet, and J.H. Page, Phys. Rev. Lett. 119, 164301 (2017).
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it