The anechoic assumption has long been used for the modeling of long exit pipes or ducts of acoustic elements [1, 2, 3, 4, 5, 6, 7]. Especially in compressor discharge line modeling, the exhaust pipe from the compressor manifold leading all the way to the condenser is usually assumed to be anechoic since it is very long. Also, experimental efforts have been made by investigators using different ...

Classification of processes as stationary or nonstationary has been recognized as an important and unresolved problem in the analysis of scaling signals. Stationarity or nonstationarity determines not only the form of autocorrelations and moments but also the selection of estimators. In this paper, a methodology for classifying scaling processes as stationary or nonstationary is proposed. The m...

We have extended the high-temperature susceptibility series of the three-dimensional spin-1 2 Ising model to O(v 26). Analysis of the new series gives α = 0.101 ± 0.004. In an earlier paper [4] we gave series to order v 22 for the high-temperature expansion of the zero-field partition function of the 3-dimensional Ising model. More precisely, we gave the coefficients a n , n = 0, 22, defined by...