Database of wood properties from specimens of the French Guiana wood collection
Bibliographic record
Abstract
The wood collection (Xylotheque or Xylarium) of Kourou (French Guiana) was created in 1976 by Jean Thiel and has since been augmented by many contributors. It is a child collection of the Xylotheque of Montpellier. A Xylarium, like the one in Kourou, is a unique collection of wood assembled over many years that represents high interspecific diversity. In addition to the standard use of such collections for systematic anatomy, a technological database can be created using duplicates of reference plates. We performed physical, mechanical and durability tests on wood planks measuring 10x60x100L mm3 from 445 woody species in French Guiana belonging to 63 families. Wood densities ranged from 250 to 1300 kg/m3, with an average of 0.786 kg/dm3. The other properties also covered a wide range of values, as did the longitudinal modulus of elasticity, since we tested samples from lianas and palm stipes as well as from very stiff woods. More information about the file “Xylarium Kourou” Data fields The file provides information for 446 specimens of the Cirad Kourou’s wood collection: Kourou Xylarium Identifier : historical index Scientific Name Genera Species Family * indicates an introduced species (not local species) L*: clarity, black = 0 and white = 100 a*: red (positive) and green (negative) components b*: yellow (positive) and blue (negative) components Hue angle: H* = atan (b*/a*) C*: Chroma = square (a*² + b*²) BD: basic density (kg/m3) D12: dry density (kg/m3) CF: conversion factor for basic density from air dry density: CF=BD/ D12 VS: volumetric shrinkage (%) SM: specific modulus (Mm²/s²) E: longitudinal modulus of elasticity (Gpa) Tand: damping coefficient (%) DSd: relative deviation from standard damping: DSδ= (tanδ-tanδs)/ tanδ ML: mass loss (%) after a 6-month bed test (fugus resistance)
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.014 | 0.009 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.037 | 0.013 |
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".