Experimental diffusivity and solubility of carbon dioxide and nitrogen in polyproplene
Bibliographic record
Abstract
In this work, we determined the concentration-dependent diffusivity and solubility of environmentally benign blowing agents, carbon dioxide and nitrogen in polypropylene. For this purpose, experiments were carried out to obtain pressure decay data in the range 170-190°C and 0.29-7.32 MPa. For each experimental run, the mass of gas absorbed as a function of time led to the calculation of diffusion coefficient. The equilibrium pressure at sufficiently long time enabled the calculation of solubility. The calculus of variation was used to establish the necessary conditions for the determination of concentration-dependent diffusivity such that the model-predicted mass of gas absorbed in polymer matches with the experimental counterpart. The value of diffusivity was found to lie in the ranges 2.67-9.13xlO-9 and 3.88-12.94xlO-9 m2 S- I for carbon dioxide and nitrogen, respectively.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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) | 0.002 | 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".