Wall coverings
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 111 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0143-7496
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π SIMILAR VOLUMES
The theory, already previously communicated, of the absorption of sound by porous compressible wall-coverings is here extended to the case that the resistance of the air in the skeleton is of such a nature that the air can neither be considered as entirely free, nor as entirely unfree. The four simb
## Abstract In an earlier article, Willem H. Haemers has determined the minimum number of parallel classes in a resolvable 2β(__qk__,__k__,1) covering for all __k__ββ₯β2 and __q__β=β2 or 3. Here, we complete the case __q__β=β4, by construction of the desired coverings using the method of simulated a