<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">H</mml:mi><mml:none/><mml:none/><mml:mprescripts/><mml:none/><mml:mn>2</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>NMR angle-dependent spectral study of core dynamics in a discotic columnar phase
Bibliographic record
Abstract
A detailed (2)H NMR study of a discotic monomer is reported in its columnar phase at 61.4 MHz. A simulation of angular-dependent spectral patterns and/or signal intensities of the aromatic deuterons is shown to provide information on the small step (or jump) diffusion rates in the low temperature region of the D(ho) phase, where the motion is in the intermediate motion regime. In the high end of this phase, the motion falls into the fast motion regime and spectral patterns become insensitive to the diffusion rate. In such a case, angular-dependent NMR signal intensities were used to give the required dynamic information. The diffusive motion about the columnar axis is found to be thermally activated with an activation energy of 69 kJ/mol. Deuteron spin-lattice relaxation rates were measured at 61.4 MHz and interpreted by a conventional rotational diffusion model in order to complement and compare with the above study when possible.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.004 | 0.004 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.623 | 0.595 |
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".