Bibliographic record
Abstract
The concept of using gaseous detonation waves to generate high-pressure propellant for a single-stage gas gun is investigated theoretically and experimentally. The advantage of this approach (in contrast to conventional light gas guns) is that the resulting launcher is inexpensive to construct and simple to operate, yet is capable of achieving velocities in excess of 3 km/s. Theoretical internal ballistics methods have been developed for the optimization of gas gun systems. A prototype detonation driven gas gun system has been developed. Performance of the gun system is optimized by formulating the detonable mixture to use as propellant, with fuel rich hydrogen/oxygen or helium-diluted hydrogen/oxygen appearing the most promising. All the parameters of the launcher design are explored using a quasi-one-dimensional Euler code to model the internal ballistics. Experimental implementation of the concept is performed with a 1.27-cm-inner-diameter (ID), 1.83-m barrel driven by the detonable gas mixture contained in a 1-m-long, 3.2-cm-ID driver. Velocities of 2.7~km/s are demonstrated with 2.5-g projectiles.
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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 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".