Evaluation of the durability of the exterior siding products made with trembling aspen lumber in terms of colour change
Bibliographic record
Abstract
Trembling aspen (Populus tremuloides) is a fast-growing and widely distributed species in Canada, but its uses in non-structural wood products are limited. This study was aimed at evaluating the feasibility of using aspen lumber for producing wood siding products and their durability in terms of colour change (ΔE). Both short-term natural exposure and artificial accelerated weathering tests were conducted on the aspen wood sidings produced and pressure-treated on a production line. The spruce-pine-fir (S-P-F) sidings were used as control. It was found that (1) both short-term natural and artificial accelerated weathering tests resulted in an increase in average ΔE of the siding specimens, exhibiting surface greying and darkening. (2) Finished trembling aspen siding specimens consistently exhibited greater colour stability than finished S-P-F ones. (3) Both finished trembling aspen and S-P-F siding specimens had smaller ΔE values than unfinished ones, suggesting the finishing employed in this study effectively protected surface colour.
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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".