Laboratory measurements and predictive equations for gas diffusion coefficient of unsaturated soils
Bibliographic record
Abstract
Molecular diffusion is an important mechanism for gas transport through soil covers placed over municipal dumps (from which bio-gas must not escape) and above acid generating mine tailings (where oxygen availability must be controlled). Gas flux through cover systems depends on the effective diffusion coefficient De of the cover materials. In this paper, the authors describe a laboratory procedure for oxygen diffusion tests, and present results obtained on different types of porous materials at various degrees of saturation. The determination of De from experimental measurements is based on analytical and numerical solutions to the diffusion equations. The measured values of De are compared to values calculated from two predictive models. A new expression is finally proposed as a simple means of estimating De. RESUME La diffusion moleculaire est un mecanisme important de transport de gaz a travers les couvertures en sols mises en place sur les decharges municipales (d’ou le bio-gaz ne doit pas s’echapper) et sur les parc a residus miniers generateurs d’acide (ou la disponibilite de l'oxygene doit etre controlee). Le flux de gaz a travers les systemes de recouvrement depend du coefficient de diffusion effective De des materiaux de la couverture. Les auteurs decrivent ici un procede pour realiser des essais de diffusion a l'oxygene au laboratoire et presentent des resultats obtenus sur differents types de materiaux poreux a divers degres de saturation. La determination de De a partir des mesures experimentales est basee sur des solutions analytiques et numeriques aux equations de diffusion. Les valeurs experimentales mesurees sont comparees aux valeurs calculees a partir de deux modeles de prediction. On propose finalement une nouvelle expression comme moyen simple d'estimer De.
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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) | 0.001 | 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 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".