In this paper we develop fundamental convexity properties of unfinished work and packet waiting time in a work conserving */*/1 queue. The queue input consists of an uncontrollable background process and a rate-controllable input stream. We show that any moment of unfinished work is a convex function of the controllable input rate. The convexity properties are then extended to address the probl...

The reliability models of the components under the nonstationary random load are developed in this paper. Through the definition of the distribution of the random load, it can be seen that the conventional load-strength interference model is suitable for the calculation of the static reliability of the components, which does not reflect the dynamic change in the reliability and cannot be used t...

In the design of land-based or offshore wind turbines for ultimate limit states, long-term loads associated with return periods on the order of the service life (20 years, usually) must be estimated. This requires statistical extrapolation from turbine load data that may be obtained by simulation or by field tests. The present study illustrates such extrapolation that uses field data from the B...

A model of fractional-order of thermoelasticity is applied to study a 2D problem of mode-I crack in a fibre-reinforced thermal environment. The crack is under prescribed distributions of heat and pressure. The normal mode analysis is applied to deduce exact formulae for displacements, stresses, and temperature. Variations of field quantities with the axial direction are illustrated graphically....

Pre-clinical evaluations of acetabular prosthesis designs call for an accurate numerical model of the natural pelvis. Stress analysis of the pelvis during physiological loading conditions is necessary to understand the load transfer mechanism, its relation with bone morphology and to analyze the deviations in stress distributions due to implantation of the acetabulum. Despite a few experimental...

Reinforced concrete (RC) structural walls are widely used in high-rise structures earthquake-prone areas. Damaged by the earthquakes past decades, these buildings need retrofitting order to increase resilience of with shear walls. This study aimed investigate RC wall using energy dissipation devices. To this end, a total four 15, 20, 25, and 30 stories equipped as their lateral load-resisting s...