A quality engineer samples 100 steel rods made on mill A and 150 rods made on mill B. Of the rods from mill A, 88 meet specifications, and of the rods from mill B, 135 meet specifications. a) Estimate the proportion of rods from mill A that meet specifications, and find the uncertainty in the estimate. b) Estimate the proportion of rods from mill B that meet specifications, and find the uncertainty in the estimate. c) Estimate the difference between the proportions, and find the uncertainty in the estimate.
Three kinds of shaped MIL-88A-Fe catalysts were successfully prepared.Shaped MIL-88A-Fe expose different ratio of (100) surface.Exposed (100) surfaces determined Fenton-like activity.The dissociated process of H2O2 over MIL-88A-Fe are disclosed.
Morphology of MIL-88A-Fe greatly affects their Fenton-like performance. In this work, rod-like, spindle-like and diamond-like MIL-88A-Fe was prepared by changing the ratio of solvents in solvothermal process. Their physicochemical properties are fully investigated by XRD, SEM, TEM, XPS, ESR, and DFT calculation, which confirmed that the exposed (100) ratio of MIL-88A-Fe determined its catalytic performance. The (100) surface of MIL-88A-Fe showed lower energy barrier for H2O2 dissociated into OH (dissociated energy 0.58eV), corresponding value is 0.8eV for (101) surface. The Fenton-like performance has the order of r-MIL-88A (TOF 5.0 h1) > s-MIL-88A (TOF 3.3 h1) > d-MIL-88A (TOF 2.5 h1), when r-MIL-88A used as catalyst, phenol could be removed 100% in 15min by the help of H2O2 at room conditions, its activity are better than that of reported Fe-based MOFs, such as MIL-88B-Fe, MIL-101-Fe, and MIL-53(Fe) etc. This finding probably provide a Fenton-like catalyst by choosing the suitable crystal phase of Fe-based metal organic framework.
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110 m/s160 t/h5.5 mm 26.0 mm 11400,000 t/y
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PT. Ispat Wire Products was established in 1991 which is the largest nail producer in Indonesia. Our working philosophy is guided towards continuous improvement in the quality of our products and services so as to surpass the best standards in the industry. Details...