Particle penetration through rectangular-shaped cracks
Bibliographic record
Abstract
An outdoor-to-indoor particle penetration experiment was undertaken to validate an air infiltration flow and particle penetration model that simulates particle transport through cracks between a pair of parallel plates. Results indicated that the infiltration flow model agreed with experimental observations, and the infiltration flow field could be assumed laminar for typical outdoor-to-indoor differential pressures (1 to 15 Pa). Observations of the particle deposition pattern on crack surfaces indicated that gravitational sedimentation was the dominant deposition mechanism for 1.4 µm particles. Particle penetration coefficient (Pp) increased monotonously with increasing differential pressure and crack height (H), and decreased monotonously with increasing crack length (L). For H > 0.305 mm, and L < 30 mm cracks, Pp was greater than 0.8 for the tested conditions and particle sizes. Complete penetration was observed for H > 0.406 mm cracks under the outdoor-to-indoor differential pressures tested. The particle penetration model was able to predict experimentally derived Pp. Key words: infiltration, particle penetration coefficient, gravitational sedimentation, Brownian diffusion.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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) | 0.001 | 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".