Bibliographic record
Abstract
Eight rock bolts,800 mm,900 mm,1100 mm,1300 mm,1500 mm,1800 mm,2000 mm and 2500 mm in length,respectively,were designed to investigate the attenuation characteristics by using a guided wave non-destructive test system,which included a Handy-scope,an amplifier,two R6α transducers and a computer.The results demonstrate that amplitudes of ultrasonic guided waves present a negative exponential distribution and the average amplitude ratios of all wave packets are near 0.7 within the range of the tested frequencies(40~100 kHz),which could be interpreted that the frequency of guided waves had little impact on attenuation.All of the average amplitude ratios of wave packets are near 0.7 with various bolt length too,which could be interpreted that the length of rock bolts had little impacts on attenuation in the tested range.It is understood that in addition to the nature of the material,attenuation of ultrasonic guided waves was mainly from setup energy loss in a free rock bolt.This study also suggest that the amplitude ratio is more stable and reliable than absolute amplitude value and it can be used to quantify the guided wave amplitude attenuation.
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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) | 0.000 | 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".