Structural performance of finger-jointed black spruce lumber with different joint configurations
Bibliographic record
Abstract
In Eastern Canada, black spruce (Picea mariana (Mill.) B.S.P) is used for producing engineered wood products. However, little information is available on the influence of finger-joint configuration on the structural performance of this species. The purpose of this work was to evaluate the behavior of finger-jointed black spruce for three joint configurations: feather, male-female, and reverse. Isocyanate adhesive was used for all types of joints studied. All of the three joint configurations performed well and strength values were found to meet the Canadian standard requirements. Significant differences were found for bending strength between the three joint profiles. The same trend was observed for tension strength but differences were not statistically significant. The analysis indicated that the feather configuration performs better than male-female and reverse profiles, especially for horizontal structural joints. In tension and bending tests, wood failure was mostly produced along the joint profile but with some failure at the finger roots, indicating an excellent performance of the gluelines.
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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) | 0.001 | 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) | 0.001 | 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".