Problem Definition: Motivated by ride-hailing platforms such as Uber, Lyft and Didi, we study the problem of matching riders with self-interested drivers over a spatial network. We focus on the performance impact of two operational platform controls---demand-side admission control and...

We study a finite horizon, single product, periodic review inventory system with \emph{two} supply sources and a salvage option. These supply sources are typically capacitated and capacity levels often need to be reserved or installed in advance of the operational planning horizon. The supply...

We address a general periodic review inventory control model with the simultaneous presence of the following complications: (a) bilateral inventory adjustment options, via procurement orders and salvage sales or returns to the supplier; (b) fixed costs associated with procurement orders and...

We address a two-stage Newsvendor model in which the mean demand -- but not the actual demand -- at first random itself, gets revealed in midstream, in time to place a second order, albeit that the unit cost price of this second order is higher than that of the original one. The two-stage...

We study a general finite horizon, periodic review combined inventory and pricing model with N suppliers and T periods, where both the demands and the supply mechanisms are random. The random supply mechanisms are of a general type that includes most structures encountered in practice. Demands...

This study investigates the coarse Laves phase stimulated nucleation of recrystallization behavior in iron–chromium–aluminum (Fe–Cr–Al) alloys. The results reveal that the samples with coarse Laves phase in the matrix owe a finer grain because of the occurrence of particle stimulated...

Rice can potentially pose serious health risks due to its highly efficient arsenic (As) uptake. Sulfur (S) is not only an essential macronutrient, but it also has the ability to decrease As accumulation. In the present study, a hydroponic experiment was conducted to investigate the mechanisms...

In this study, the synergistic effects and mechanisms of biodegradation on aromatic compounds including phenol (PHN), naphthalene (NAP), phenanthrene (PHE), and pyrene (PYR) as the only carbon source by bacterial flora were investigated. The results indicated bacterial synergy for the...