Homogeneous Octacalcium Phosphate Precipitation: Effect of Temperature and pH
Bibliographic record
Abstract
Octacalcium phosphate (OCP) was prepared by homogenous precipitation at 40 to 60degreesC in the pH range 6.0 to 7.5 and depending on conditions either no precipitate was formed or a variety of morphologies of OCP were produced. At a given temperature, in low pH conditions no precipitate was formed, at higher pHs large OCP particles were precipitated which were spherical in shape with long plate-like (LP) crystals radiating from a central nucleus. At higher pH, within a very narrow pH range, the spherical particles were covered by short-plate (SP) like crystals. As the pH was raised further, aggregated spheres (AS) of poorly crystalline OCP were precipitated. The spherical crystals had a mean particle size range from 20 to 1000 mum. FTIR spectra of AS were more similar to that of hydroxyapatite than OCP. As the size of the precipitated particles increased, the spectral similarity with OCP also increased.
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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) | 0.001 | 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".