MetallurgicalEngi-The model derived in this paper is intended. for the testing of control strategies using off-gas variables in With the EAF in operation, the roof is closed, and off-gas is extracted through the duct in the roof. The off-gas system employs an extraction fan to pass the off-gas through a baghousefiltration system. Figure l gives a schematic description. For simplicity an equivalent fan without the baghouse and extraction fan is shown in Fig. l The scrap does not contain impurities that will be oxidized. In steel-making practice graded scrap is needed (Geldenhuisl6)) for low tramp e]ement requlrements in steel, to prevent high impurity content.
The corporate Web site is an indispensable part of any e‐commerce venture. If users find it difficult to do electronic transactions, they will visit another online source, or go to a physical source instead. Evaluating the performance of e‐commerce Web sites has received some attention in the past few years, but there is still a pressing need for a more comprehensive approach. This paper attempts to address this need by providing an e‐commerce Web site evaluation framework and method built on solid business principles, and using multidimensional scaling to analyse evaluation data and present the results in a graphic manner for easy interpretation.
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