Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Engineering
On The Mean Time Between Failures For Repairable Systems, Max Engelhardt, Lee J. Bain
On The Mean Time Between Failures For Repairable Systems, Max Engelhardt, Lee J. Bain
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Much of the recent work on modeling repairable systems involves Poisson processes with nonconstant intensity functions, viz, nonhomogeneous Poisson processes. Since times between failures are not identically distributed when the process is nonhomogeneous, it is not clear what concept should take the place of the mean time between failures in assessing the reliability of a repairable system. A number of alternate concepts can be found in the literature. We investigate the relationship between two of the most frequently considered alternatives: the reciprocal of the intensity function, and the mean waiting time from t until the next failure. Theorem 1 states …
Swelling Pressure Studies Of Shales, S. L. Huang, N. B. Aughenbaugh, John D. Rockaway
Swelling Pressure Studies Of Shales, S. L. Huang, N. B. Aughenbaugh, John D. Rockaway
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
A swelling model was developed to predict the swelling pressure which occurs within shale or shale material when it is immersed in water. This model is also capable of estimating the magnitude of shale swelling when subject to humidity changes. The model was developed on a basis of the moisture susceptibility of the shale and the initial humidity of the ventilated mine air. The Moisture Activity Index (IRH) was selected to describe the susceptibility of shale to moisture because of its close association with the other physical properties, its strong correlation with the swelling of the shale, and because it …