Effects of Climatic Aging on the Performance of EPDM Used in Power Cable Insulation
Bibliographic record
Abstract
This work is intended to contribute to better understanding towards the weathering degradation of the properties of ethylene-propylene-diene-monomer (EPDM), a polymer used as insulation in medium voltage electrical cables. The samples were exposed to natural weathering in the city of Tizi-Ouzou, in northern Algeria, over a period of approximately 5.5 months. The samples were monitored using a variety of electrical and mechanical characterization methods, including measurements of bulk resistivity, dielectric strength, dielectric constant, dielectric loss factor, tensile strength, and elongation at break. Material color change, surface stiffening and increased surface cracking are the major macroscopic effects of weathering degradation. Electrical and mechanical test results show that after this period of weathering, only the resistivity and elongation at break were significantly affected. The other physical properties of the polymer were only slightly altered, suggesting the need for a longer accelerated aging period. Some of the characteristics that are measured are markers of aging that could be used in the future to predict the service life of an insulator.
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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 | 0.000 |
| 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 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".