On the mechanism of laser-induced annealing of soot
Bibliographic record
Abstract
Abstract Ultrafine soot particles emitted from combustion devices and biomass burning are a major particulate pollutant for human health and a major climate forcer. Unprecedented efforts have been made to understand the mechanism of soot formation and the physical, chemical, and optical properties of soot particles at different stages of maturity. Pulsed laser-induced incandescence (pLII) has become a powerful tool for in-situ measurements of soot volume fraction and primary particle size and to investigate the effects of pulsed laser irradiation on soot absorption properties. Experimental studies have confirmed that a high-power laser pulse can enhance the absorption of young soot particles through laser-induced annealing. Previous studies have ascribed the observed changes in soot absorption by pulsed laser irradiation to thermal annealing. In this study, a numerical study was conducted to model the effect of pulsed laser irradiation on the absorption efficiency of soot of different maturities to reproduce the results of a recent double-pulse pLII experiment. The numerical results based on thermal annealing models proposed in the literature failed to capture the enhanced peak LII signals of laser-heated young soot compared to those of un-preheated soot. By assuming the laser-induced annealing of soot particle is attributed to both thermal and photon mechanisms, the modified LII model can reproduce the experimentally observed enhancement in the peak LII signal of laser irradiated soot of different maturities. The findings of this study serve as indirect evidence to support the conjecture that the photon mechanism plays an important role in laser-induced annealing of young soot.
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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".