Compact acoustic double negative metamaterial based on coexisting local resonances
Bibliographic record
Abstract
Acoustic metamaterials generally exploit resonances to assume negative properties. While many types of resonances can be used for achieving a negative bulk modulus, the number of types of resonances for generating a negative mass density is limited. In this work, a double negative airborne acoustic metamaterial is proposed, whose negative density is achieved from Fabry-Pérot resonance. More specifically, each unit cell of the metamaterial comprises only a single element, allowing coexistence of local Helmholtz resonance and Fabry-Pérot resonance to simultaneously generate a negative modulus and negative density. The metamaterial exhibits a reversed phase velocity and negative refraction, even if the constitutional elements are randomly distributed. This is a pioneering work that an airborne acoustic double negative metamaterial derives negative density from Fabry-Pérot resonance and maintains negative refraction with its constitutional elements randomly distributed.
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How this classification was reachedexpand
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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".