针对核电安全仪控系统的安全完整性等级评定问题,借鉴IEC61508标准第六部分计算简单冗余结构失效概率的方法,对四取二冗余结构进行可靠性分析,提出一种面向工程应用的失效概率计算新方法 POPFA(Practice-oriented Probability of Failur...针对核电安全仪控系统的安全完整性等级评定问题,借鉴IEC61508标准第六部分计算简单冗余结构失效概率的方法,对四取二冗余结构进行可靠性分析,提出一种面向工程应用的失效概率计算新方法 POPFA(Practice-oriented Probability of Failure Analysis)。并以数字化核电安全仪控系统TXS的四取二冗余结构为计算实例,与Markov方法进行比较,验证了计算结果正确并且计算复杂度远小于Markov方法,适用于实际工程运行中失效概率的计算。展开更多
A two-step leaching method in combination of acid and ethylene diaminetetraacetic acid disodium （EDTA-Na2） was applied to extract metals such as Cd, Cu, Fe, Pb and Zn from a zinc smelting slag. The results show that...A two-step leaching method in combination of acid and ethylene diaminetetraacetic acid disodium （EDTA-Na2） was applied to extract metals such as Cd, Cu, Fe, Pb and Zn from a zinc smelting slag. The results show that the extraction rates of Cd, Cu, Fe and Zn in slag reach 88.3%, 54.1%, 69.6% and 54.7%, respectively, while the extraction rate of Pb is only 0.05% leached with 1.25 mol/L sulfuric acid under the conditions of the ratio of slag to liquid of 100 g/L, 65 ℃ and 120 r/min for 2 h. However, Pb extraction rate from 1.25 mol/L sulfuric acid leached residue reaches as high as 66.5% by using 0.1 mol/L EDTA-Na2 solution. The results indicate that two-step sequential extraction procedure combining 1.25 mol/L sulfuric acid and 0.1 mol/L EDTA-Na2 solution can extensively extract Cd, Cu, Fe, Pb and Zn from zinc smelting slag.展开更多
文摘针对核电安全仪控系统的安全完整性等级评定问题,借鉴IEC61508标准第六部分计算简单冗余结构失效概率的方法,对四取二冗余结构进行可靠性分析,提出一种面向工程应用的失效概率计算新方法 POPFA(Practice-oriented Probability of Failure Analysis)。并以数字化核电安全仪控系统TXS的四取二冗余结构为计算实例,与Markov方法进行比较,验证了计算结果正确并且计算复杂度远小于Markov方法,适用于实际工程运行中失效概率的计算。
基金Project(2011SK3262) supported by Science and Technology Program of Hunan Province,China
文摘A two-step leaching method in combination of acid and ethylene diaminetetraacetic acid disodium （EDTA-Na2） was applied to extract metals such as Cd, Cu, Fe, Pb and Zn from a zinc smelting slag. The results show that the extraction rates of Cd, Cu, Fe and Zn in slag reach 88.3%, 54.1%, 69.6% and 54.7%, respectively, while the extraction rate of Pb is only 0.05% leached with 1.25 mol/L sulfuric acid under the conditions of the ratio of slag to liquid of 100 g/L, 65 ℃ and 120 r/min for 2 h. However, Pb extraction rate from 1.25 mol/L sulfuric acid leached residue reaches as high as 66.5% by using 0.1 mol/L EDTA-Na2 solution. The results indicate that two-step sequential extraction procedure combining 1.25 mol/L sulfuric acid and 0.1 mol/L EDTA-Na2 solution can extensively extract Cd, Cu, Fe, Pb and Zn from zinc smelting slag.
