| 000 | 00534 a2200241 4500 | ||
|---|---|---|---|
| 001 | 315713 | ||
| 020 | _a | ||
| 041 | _aeng | ||
| 080 | _aLNASA TN D 7719 : 1974 | ||
| 245 | _aAnalysis of sound propagation in ducts using the wave envelope concept | ||
| 250 | _a | ||
| 260 | _aWashington, D.C. | ||
| 260 | _bNASA | ||
| 260 | _c1974 | ||
| 300 | _a38 p. | ||
| 300 | _c | ||
| 856 | _uNASA | ||
| 490 | _aNASA TN D 7719 : 1974 | ||
| 700 | _a | ||
| 650 | _a | ||
| 650 | _aNoise, Duct, Finite difference, Boundary layer | ||
| 942 | _cPP | ||
| 942 | _2UDC | ||
| 999 |
_c263158 _d263158 |
||