The research of multi-modality control strategy of arc furnace electrode regulation
During the electric arc furnace work process, electrode arc lengths show strong random disturbs and lead to performance deterioration such as power consumption, product quality and electric network. Using a single control strategy can not satisfy the requirements of different work conditions. This paper bases on the experiences of experts, puts forward division measures of multi modality control strategy for different requirements to adjust to the smelting temperatures and power of different stages in steel making process. It identifies the feature motion state of the electric arc furnace on line, and then selects the optimal controller in different phases to deal with the problem. In this paper, multi-modality division, program implementation and algorithm model used in control strategy provide a theoretical basis and model reference for the optimal design of electric arc furnaces electrode regulator system.
Fused magnesia manufacturing process: a survey
This paper provides an overview of the manufacturing process of fused magnesia. A brief introduction to fused magnesia and its industrial production process are presented first. In order to meet the market requirements and reduce costs, fused magnesia industrial process begins to focus on these issues: high energy consumption, serious pollution, low utilization of raw materials. So the issues related to fused magnesia are reviewed. The literature work related to the fused magnesia manufacturing process is divided into four categories: modeling, optimization, control, and experimental constraints. As can be seen, with the continuous development of intelligent manufacturing technology, fused magnesia manufacturing process begins to emerge new opportunities. Research trends and opportunities are presented in the final section, with an emphasis on future potential intelligent technologies.
Effect of Calcium Glycerophosphate on Demineralization in an in vitro Biofilm Model
The aim was to investigate the anti-caries properties of calcium glycerophosphate (CaGP) using an in vitro bacterial flow cell model. Four flow cells, inoculated from a chemostat containing a seven-organism bacterial consortium, were pulsed with sucrose twice daily, to provide an acidic challenge and pH-cycling conditions. Blocks of enamel and dentine were mounted in each flow cell. In a study on the effect of CaGP concentration, CaGP was pulsed into three of the flow cells, at the same time as the sucrose, to give concentrations of 0.10, 0.25 and 0.50%. Water was pulsed into the fourth flow cell with the sucrose. Microradiography revealed a significant dose response of decreasing demineralization as CaGP concentration increased. Reductions at 0.25 and 0.5% were significant when compared to the control. A second study investigated the effect of timing of CaGP pulsing, relative to sucrose, on enamel and dentine demineralization. CaGP (flow cell concentration 0.2%), was pulsed 1 h before, during or 1 h after the sucrose pulse; a water control was employed. In enamel, pulsing CaGP before the sucrose reduced demineralization significantly compared to concurrent pulsing, which in turn gave a significant reduction compared to pulsing after sucrose, which did not reduce demineralization significantly compared to the water control. In dentine, CaGP reduced demineralization significantly only when pulsed before the sucrose. The findings suggest that in vivo, the anti-caries potential of CaGP may be greater if it is applied before a cariogenic challenge.