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针对复杂的城市燃气输配系统,利用因果图和模糊综合评价相结合的方法对其进行风险分析.因果图能找出影响城市燃气输配系统失效的因素,模糊综合评价则可在其基础上对风险量化.以某市的燃气输配系统为例描述了该方法的步骤.结果表明,因果图和模糊综合评价相结合的方法合理且易于工程应用. 相似文献
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羟丙基-β-环糊精与亚碘酰苯甲酸包结物对毒剂模拟剂的降解 总被引:1,自引:0,他引:1
评价羟丙基-β-环糊精(HP-β-CD)对糜烂性毒剂芥子气(HD)模拟剂2-氯乙基乙基硫醚(CEES)、G类模拟剂磷酸三甲酯(TMP)和甲基对硫磷农药的增溶作用,结果表明,HP-β-CD对模拟剂的增溶倍数服从线性规律.HP-β-CD和亚碘酰苯甲酸 (IBA)包结物对CEES和丙氟磷农药(DFP)的催化降解结果表明,CEES被HP-β-CD包结,与空腔中的IBA相遇,部分水解,部分被IBA氧化;DFP在包结物消毒剂溶液中的降解呈拟一级反应,水解速率随IBA浓度的提高呈线性增加,降解速率比IBA胶束溶液提高了近6倍,推测在反应过程中DFP进入HP-β-CD空腔,IBA催化DFP发生P-F键断裂降解反应. 相似文献
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Water consumption in agricultural activities is the main water use in inland oases in Northwest China. Research on water conservation in agriculture is of great significance to alleviate the conflict between the use of agricultural and ecological water and is of great importance to local farmers’ livelihoods. This study, based on traditional irrigation practices (flood irrigation and fixed irrigation frequency) of Minqin County in Shiyang River Basion, was designed to reveal the impacts of five irrigation quotas (1 800, 1 440, 1 080, 720, and 360 m3/hm2) on crop yield, biomass, irrigation water use efficiency (IWUE), and economic water productivity (EWP) to determine the optimal irrigation for five crops and guide local irrigation practices. The results showed that: (1) Under the five irrigation quotas, IWUE of corn, with the highest of 12.27 kg/m3, was higher than the other four crops; (2) The average EWP of cotton with a 2-year-average of 8.0 yuan/m3 was higher than the other four crops. Thus, the economic output of cotton is the best under the same irrigation quota; (3) Considering the yield, IWUE, EWP, and biomass, corn was better than the other four typical crops; and (4) 1 080 m3/hm2 was the optimal irrigation quota for sunflower in local planting practices. In addition, 720 m3/hm2 was suitable for corn, pepper, wheat, and cotton as their irrigation quota. This study shows that reducing the amount of irrigation quota in the Shiyang River Basin can effectively improve local IWUE and EWP. © 2022 Authors. All rights reserved. 相似文献