ASSESSMENT OF X-RAY MICRO-CT MEASUREMENTS OF POROSITY AND SOLUTE CONCENTRATION DISTRIBUTIONS DURING DIFFUSION IN POROUS GEOLOGIC MEDIA
Bibliographic record
Abstract
Using x-ray micro-computed tomography (micro-CT) for quantitative measurements in porous media is inherently challenged by uncertainties, which need to be identified and quantified to enable meaningful interpretation of measurements. For this purpose, we present results of experiments using micro-CT to measure the three-dimensional distribution of diffusion-accessible porosity and time-variant iodide tracer concentration within dolostone and sandstone samples. The precision, detection limits and spatial resolution of measurements were determined. Using a 0.6 M iodide tracer, the precision of attenuation coefficient measurement was approximately ±4%, in both the dolostone and sandstone samples. The precision for diffusion-accessible porosity and solute concentration measurements were ±7% and ±0.04 M, with detection limits of 20% and 0.12 M, respectively. The spatial resolution of measurement was 40 μm, representing the minimum size of features that can be distinctively resolved in a reconstructed image with 18.23 μm voxel size.
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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 | 0.001 | 0.002 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| 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 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".