<title>Quarter-wave polymeric interference mirror films</title>
Bibliographic record
Abstract
Quarter-wave interference films have seen numerous uses in the field of optical security, due to the strength of reflection, ability to select numerous colors, and especially for their conspicuous color shift. Decorative nanolayer quarter-wave polymeric material of greater than 100 layers have been known for twenty years, but did not have utility in the security market, because of their weak iridescent appearance. Through the use of polymers of higher refractive index difference, 3M has achieved strong reflectors with better band edge control. Extremely efficient broadband mirrors have been made for commercial use. By choosing the reflection to be in the near IR, a unique security laminate film is achieved. It is very transparent at normal incidence, and changes to a brilliant cyan at shallow viewing angles. This material is easily noticed by the typical observer, and is also machine- readable. The polymeric quarter wave mirror films may be fine-line embossed, permanently thinning the layers in that area, and further enhancing their appearance.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.138 | 0.038 |
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 source (direct Gemma or distilled Codex), 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".