The Test Survey on the Acoustic Characteristic of Whistle For Locomotive
Bibliographic record
Abstract
Compare the acoustic characteristic with the different type of air horn.The measuring results showed that the air horn all produce 105～112 dB(A) of sound level at 30 meters directly in front of the train.2～8 dB(A)was happened at 30 meters radius subtended forward of the locomotive by angles 0 degree to the left or to the right of the centerline of the track in the forward direction of travel and 6～11 dB(A) was happened at 30 meters radius subtended forward of the locomotive by angles 0 degree and 90 degrees to the left or to the right of the centerline of the track in the forward direction of travel to the air horn of China.But 1～2 dB(A)was happened that whenever at 30 meters radius subtended forward of the locmotive by angles 0 degree or angles 0 degree and 90 degrees to the left or to the right of the centerline of the track in the forward direction of travel to the the air horn of U.S.A or Canada.The main sound energy of the air horn by the Canada or U.S.A.was appeared in from 250～4000 Hz,but the main sound energy of the ones by made in China was from 500～8000 Hz.
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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 | 0.001 | 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) | 0.003 | 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 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".