Bibliographic record
Abstract
Sound attenuation between work areas in open offices depends on barrier height and the sound-absorbing properties of the ceiling. Two methods for evaluating the sound-absorption ceilings are available: ASTM E1111, which gives a rating called the articulation class (AC), and ASTM C423, which gives sound-absorption average (SAA). Measurements of six ceiling systems made in accordance with ASTM E1111 and ASTM C423 provide a link between AC and SAA. Manufacturers often do not provide both ratings for their products, and it is useful to be able to use either rating system. SAA and measured AC for a 1.5-m-high screen are related by AC=102×SAA+91.4. SAA and calculated values of AC for a 1.8-m-high screen are related by AC=118 SAA+93. In the absence of E1111 test data, C423 SAA values can be used to select ceiling systems. The commonly recommended minimum SAA of 0.9 corresponds to an AC of 180 when the screen height is 1.5 m and to an AC of 200 when the screen height is 1.8 m. An approximate conversion from absorption coefficients to reflection coefficients agrees well with earlier work.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".