Chemical and physical degradation effects on epoxy surfaces exposed to partial discharges
Bibliographic record
Abstract
Plane-parallel electrodes coated with epoxy resin have been used to investigate partial discharge (PD)-induced degradation of the insulating material. The mean amplitude of pulse-type discharges has been measured as a function of PD exposure duration, while light emission from the discharge space was simultaneously monitored using a sensitive photomultiplier tube (PMT). This combination of discharge diagnostics has allowed us to observe, for all specimens studied, a transition from an initial regime of large-amplitude (/spl gsim/100 pC) pulses to smaller pulses (/spl sim/1 pC) superimposed upon a continuous glow (pseudoglow and true glow) regime. Some specimens eventually sustained a pure (pulseless) glow discharge. The transition, typically after a few hundred hours, is attributed to PD-induced chemical modification of the epoxy surface, which drastically increases its electrical conductivity. Using various complementary physical and chemical techniques, we have studied the evolution of the specimen surface and near-surface regions as a function of PD exposure duration up to several thousand hours. For example, certain reaction products of PD-induced oxidative degradation have been identified; not surprisingly, the transition to a pseudoglow or glow regime does not interrupt the degradative processes in the specimens' surface and bulk (/spl lsim/300 /spl mu/m) regions.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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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) | 0.000 | 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) | 0.000 | 0.001 |
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".