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Articles by Q. Song
Total Records ( 2 ) for Q. Song
  S. Chen , Q. Song , Y. Cheng and L. Chen
  Nowadays, the inventory misplacement is a significant issue in the supply chain management. This study analyzes how the managers consider using Radio Frequency Identification (RFID) to effectively eliminate misplacement problems and to improve profitability. A mean-risk framework is carried out to portray this issue and a central semi-deviation model is proposed for risk measurement to analyze the impact of risk attitude on RFID adoption. Both risk neutral and risk aversion cases are discussed in this study. By considering both fixed setup cost and the tag cost, it is proved that retailers do not always benefit more from implementing RFID, unless the level of available products and tag cost are both low enough. Under the risk analysis, it is found that a risk aversion manager will be more unwilling than a risk neutral manager to invest RFID technology. Moreover, the manager will be more unwilling to invest RFID if the manager is more risk-averse.
  J.-K. Zhuo , S.-Q. Li , Q. Yao and Q. Song
  In this work, we aim to investigate the formation mechanisms of submicron particulate matter (PM1) by observing progressive changes of collected samples at different combustion stages. A 25 kW quasi one-dimensional down-fired pulverized coal combustor was used, where PM1 was collected from the furnace centerline through the desired sampling ports by using a nitrogen-aspirated, water-cooling isokinetic sampling probe followed a 13-stage electric low pressure impactor. First, the mass concentration particle-size-distributions (PSD) of PM1 sampled at coal flame zone clearly exhibit two distinct modes separated by a fraction of 0.173–0.267 μm, ultrafine mode and intermediate mode. However, the ultrafine peak around 63 nm greatly decreases and becomes flat as coal combustion further progresses along axial length. Then, the contributions of either organically bounded minerals or inherent minerals to these two modes at different stages are analyzed. Finally, the evolution of sulfur-concentration PSD reveals the effects of pyrite decomposition and the sulfation reaction on PM1 formation in the combustion system.
 
 
 
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