Alleviating Geysers through Standpipes in Sewer Systems
Bibliographic record
Abstract
Geysers in sewer systems are receiving considerable attention due to the public safety concerns. There have been relatively limited studies on geyser formation process and its association with air release from pressurized pipes, consequently very few relevant mitigation measures have been proposed. A large physical model was initiated to study the geysering flow through standpipes and to examine key parameters which may have great influence on geysers. Air-control plates and throttled vent pipes were found to be remarkably effective in alleviating geyser intensity and pressure oscillations in the present study. For vent pipes with diameter d = 0.04 m and 0.06 m, adding an air-control plate with an orifice (d1 = 0.01 m) resulted in much weaker water jets through the orifice and the pressure peak was also reduced by about 70% and 55%, respectively. If cover blow-off occurred in the air release process, a much larger pressure spike could emerge, with the peak about 3.5 times as large as that without cover blow-off.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| 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".