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Quality in Procurement
Published in K. S. Krishnamoorthi, V. Ram Krishnamoorthi, Arunkumar Pennathur, A First Course in Quality Engineering, 2018
K. S. Krishnamoorthi, V. Ram Krishnamoorthi, Arunkumar Pennathur
First, we want to remember that the AQL values shown at the head of the columns of the MIL-STD tables are in percentages. Some of them (AQL ≤ 10%) are in percent defectives, or number of defectives per 100 units of a sample. Others (AQL > 10%) are in number of defects per 100 units of a sample. The former is used when quality is measured by counting the number of defectives in a sample, and the latter is used when quality is checked by counting the number of defects in each unit of a sample. In the discussion on OC curves of a sampling plan, we assumed that the number of defectives in a sample follows the binomial distribution. However, the cumulative probabilities of the binomial variable were approximated using the Poisson cumulative probabilities. When the number of defects per unit is used as the quality measure, the defects per unit follow the Poison distribution, and the probability of acceptance is calculated using the cumulative Poisson probabilities from the Poisson table.
Extraction of Ln(III) and An(III) by N,N-di(2-ethylhexyl)- thio-diglycolamic Acid
Published in Solvent Extraction and Ion Exchange, 2022
Chang Jin, Qian Liu, Yu Du, Chao Xu, Tingting Liu, Tuo Fang, Ganlin Wang, Liyang Zhu, Yan Zhang, Suliang Yang, Guoxin Tian
For the partitioning study, 4 mL of organic phase and 4 mL of aqueous solution were put into 15 mL polypropylene centrifuge tubes, then capped and mounted horizontally by clips on a rack that was shaken in a constant temperature air box at a desired temperature for 30 min. After the contacting period, the tubes were centrifuged for 5 min at 3000 rpm in a 6 R temperature-controlled centrifuge (TDL-60B, Feige). For the extraction of Am(III) and Cm(III), a 500 μL aliquot of each phase was subsampled and counted using a Liquid Scintillation Counter (TRI-CARB 3710TR/SL, Perkin Elmer). Counting times were set to be sufficient to ensure that counting error was within a margin of ±3% or better.