Many of the nominal-the-best quality characteristics important machine tool components, such as inner or outer diameters, have asymmetric tolerances. An tolerance index is a function for average process and standard deviation. Unfortunately, it difficult to obtain 100(1−α)% confidence interval index. Therefore, this study adopts Boole’s inequality DeMorgan’s theorem find combined region well Ne...

heavy metal contamination around the national iranian lead and zinc company (nilz) in zanjan province was evaluated in this paper. collected data were used to appraise the degree of soil contamination and also the source of pollution in the study area based on geoaccumulation index (igeo), and enrichment factor (ef). the levels of fe, zn, cd and pb in the samples exceed those reported in litera...