Materials issues for hydrogen R and D in Canada
Bibliographic record
Abstract
Several materials issues and challenges exist for the use of hydrogen in energy applications and form the basis for hydrogen R&D in Canada. Many of the challenges are similar for both domestic and defence applications, but there are several unique end-use requirements. In military applications the overall system should have highest energy density possible and reliably deliver for the duration of the required mission. For high energy density, this means the more hydrogen per unit weight and/or volume that can be generated, stored or carried, the better. Safety of carrying hydrogen on or near soldier is an important issue. In the military, both reversible hydrogen storage versus single use, have a place in some military applications with the classic example being metal hydrides versus chemical hydrides. Understanding and developing alternative hydrogen producing fuels with high energy densities is an important R&D effort.
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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 | 0.004 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.009 | 0.003 |
| Scholarly communication | 0.006 | 0.004 |
| Open science | 0.003 | 0.003 |
| Research integrity | 0.008 | 0.004 |
| Insufficient payload (model declined to judge) | 0.041 | 0.005 |
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".