Gravitactic Bioconvection in a Fluid-Saturated Porous Medium with Double Diffusion
Bibliographic record
Abstract
This paper examines the combined effects of density stratifications in porous media due to both gravitactic microorganism motion and thermal or solutal solicitation. These effects are coined in the literature by the term "double diffusion." In this case, an equation of conservation of energy or mass is added to the gravitactic bioconvection system. The problem is then governed by two Rayleigh numbers, a Peclet number (normalized swimming speed), and a Lewis number (ratio of thermal diffusivity/microorganism diffusivity). It is found that gravitactic bioconvection with double diffusion may contain a subcritical instability regime due in part to the gravitactic motion of microorganisms and in part to the weak diffusivity of the thermal/solutal solicitation. It is also found that there is an oscillatory regime that is established below the critical threshold of steady bioconvection. This oscillatory convection flow may arise when the diffusivity of the stabilizing component is weaker than that of the destabilizing component.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".