We consider a polling system: a queueing system of N ≥ 1 queues with Poisson arrivals Q1, . . . , QN visited in a cyclic order (with or without switchover times) by a single server. For this system we derive the probability generating function Q(·) of the joint queue length distribution at an arbitrary epoch in a stationary cycle, under no assumptions on service disciplines. We also derive the ...

Shortwave track diseases are generally reflected in the form of local irregularity. Such will greatly impact train–track–bridge interaction (TTBI) dynamic system, seriously affecting train safety. Therefore, a method is proposed to detect and localize irregularities based on multi-sensor time–frequency features high-speed railway bridge accelerations. Continuous wavelet transform (CWT) was used...

In the absence of appropriate measurement value-based intermediation (VBI) to improve efficiency for business sustainability, this study aims analyse VBI Scorecard’s usage effectiveness based on Global Alliance Banking Values (GABV). The effective utilisation performance Islamic banking institutions may ensure sustainable through inclusive transparent reporting. second aim is understand challen...

We have performed computer calculations to explore effects of the p/i interface on the opencircuit voltage in a-Si:H based pin solar cells. The principal conclusions are that interface limitation can occur for values of VOC significantly below the built-in potential VBI of a cell, and that the effects can be understood in terms of thermionic emission of electrons from the intrinsic layer into t...

Here V is electrostatic potential, u, v are Slotboom concentrations of electrons and holes, λ = 10−3 − 10−6, δ = ni (intrinsic density of electrons), C ∈ L∞(Ω) is doping profile, Q is recombination-regeneration rate, q is elementary charge, μn, μp are mobilities of electrons and holes, and Vbi, U are equilibrium and applied potentials. We consider Ω = (0, 1) × (−h, 0) in R (h is some positive n...

Vector-borne infections (VBI) are very common around the globe and they account for many devastating diseases. They are not found exclusively in the third world or tropical regions but spread to every corner of the planet. The factors driving these infections are many and interact in very complex ways. This review attempts to put into perspective the external-climate change and demographics, as...

It is critical for the safety monitoring of highway bridges that beam bridge damage can be identified from dynamic response passing vehicles. Numerical simulations vehicles were conducted utilizing vehicle–bridge coupling vibration theory and indirect measurement method. Fast Fourier transform was performed on time history vehicle acceleration, driving frequency component its instantaneous ampl...