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Maintenance-based prognostics of nuclear plant equipment for long-term operation
Zachary Welz,Jamie Coble,Belle Upadhyaya,Wes Hines 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.5
While industry understands the importance of keeping equipment operational and well maintained, theimportance of tracking maintenance information in reliability models is often overlooked. Prognosticmodels can be used to predict the failure times of critical equipment, but more often than not, thesemodels assume that all maintenance actions are the same or do not consider maintenance at all. Thisstudy investigates the influence of integrating maintenance information on prognostic model predictionaccuracy. By incorporating maintenance information to develop maintenance-dependent prognosticmodels, prediction accuracy was improved by more than 40% compared with traditional maintenanceindependent models. This study acts as a proof of concept, showing the importance of utilizing maintenance information in modern prognostics for industrial equipment.
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P. J. Welz,J. -B. Ramond,D. A. Cowan,S. G. Burton,M. le Roes-Hill 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.2
The formation of environmentally toxic acidicwaste from mining activities is a world-wide problem. Neutralization of this waste can be accomplished byphysicochemical and/or biological means. In this shorttermstudy, synthetic acid mine drainage was added tosand-filled mesocosms containing silica-dominated (quartz)sand. Glucose was added as a carbon source for microbialiron and/or sulphate reduction. Replicates contained twoseparate batches of sand obtained from the same quarrysite. The investigations used to assess and compare thechemical and biological functioning of the replicatesincluded system hydraulic conductivity measurements, sandchemistry, effluent chemistry and bacterial communityfingerprinting. Minor differences in composition of thesand, including the levels of available nutrients andmicronutrients, resulted in major differences in measuredparameters. Significant differences in effluent chemistrywere found in systems containing different batches of sand. It was demonstrated that the characteristics of the sand andthe presence of acid mine drainage (AMD) impacted thebacterial community structure and function. The importanceof the physical substrate on the selection of functionalmicrobial communities in systems remediating AMD shouldnot be under-estimated. The physical substrate should becarefully selected and it may be prudent to include smallscalecomparative studies in each particular setting prior tofull-scale implementation.
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