Polycyclic aromatic hydrocarbons in air of Harbin City
Bibliographic record
Abstract
Air samples were collected using an improved high volume active air sampler in May 7 to 20,2008 in Harbin City.Concentrations of polycyclic aromatic hydrocarbons(PAHs) in both gas and particle phases were measured.Total PAHs concentration ranged from 8.1 to 37.2 ng/m3,with an average of 18.2 ng/m3 for all samples.Sources of PAHs were identified by diagnostic ratios of some individual PAHs,which indicated that the dominant source in Harbin was coal combustion.Lower ring PAHs dominated in the gas phase,while the major higher ring PAHs were adsorbed on particle phase.While good correlation was found between gas-particle partition coefficients of PAHs and the respective sub-cooled vapor pressures,non-equilibrium between gas and particle phases was obtained possibly due to the new produced PAHs from coal combustion in winter.
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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 | 0.001 | 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) | 0.001 | 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 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".