为克服单一赋权法的局限性,结合山区干线公路交通特征及交通安全评价指标的选取原则,从社会因素、驾驶因素、环境因素、管理因素和道路因素五个维度出发,选取18个综合评价指标,运用序关系分析法(Order Relation Analysis Method,G1)-指...为克服单一赋权法的局限性,结合山区干线公路交通特征及交通安全评价指标的选取原则,从社会因素、驾驶因素、环境因素、管理因素和道路因素五个维度出发,选取18个综合评价指标,运用序关系分析法(Order Relation Analysis Method,G1)-指标相关性权重确定法(Criteria Importance Through Intercriteria Correlation,CRITIC)确定各评价指标的权重,并结合折中妥协多属性决策法(VlseKriterijumska Optimizacija I Kompromisno Resenje,VIKOR)对山区干线公路交通安全进行综合评价,提出了基于G1-CRITIC-VIKOR模型的山区干线公路交通安全综合评价及比选方法。以中国西部6条山区干线公路为例进行实证研究,结果表明,G1-CRITIC-VIKOR模型的评价效果与传统的秩和比(Rank-Sum Ratio,RSR)综合评价法及加权逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)的评价结果基本一致,且评价效果明显优于后者,具有更好的辨识性,验证了该模型的可行性和科学性。展开更多
Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordina...Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordination catalysis mechanism.Both the acidity and the structure of the acid ligand had a notable effect on the catalytic ability of the catalytic system.By using sulfosalicylic acid as acidic ligand and the mole ratio of sulfosalicylic acid to Na2WSO4·2H2O was 1/1,the intermediate products of the catalytic oxidation reaction were analyzed by the GC-FTIR technique.the result showed that ε-caprolactone was the important stable intermediate product of the reaction.The possible mechanism was proposed.The cyclohexanone was oxidized by hydrogen peroxide to ε-caprolactone in the first step based on the Baeyer-Villiger oxidation mechanism,then the product from the rapid hydrolization of ε-caprolactone is oxidized to adipic acid.展开更多
文摘为克服单一赋权法的局限性,结合山区干线公路交通特征及交通安全评价指标的选取原则,从社会因素、驾驶因素、环境因素、管理因素和道路因素五个维度出发,选取18个综合评价指标,运用序关系分析法(Order Relation Analysis Method,G1)-指标相关性权重确定法(Criteria Importance Through Intercriteria Correlation,CRITIC)确定各评价指标的权重,并结合折中妥协多属性决策法(VlseKriterijumska Optimizacija I Kompromisno Resenje,VIKOR)对山区干线公路交通安全进行综合评价,提出了基于G1-CRITIC-VIKOR模型的山区干线公路交通安全综合评价及比选方法。以中国西部6条山区干线公路为例进行实证研究,结果表明,G1-CRITIC-VIKOR模型的评价效果与传统的秩和比(Rank-Sum Ratio,RSR)综合评价法及加权逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)的评价结果基本一致,且评价效果明显优于后者,具有更好的辨识性,验证了该模型的可行性和科学性。
文摘Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordination catalysis mechanism.Both the acidity and the structure of the acid ligand had a notable effect on the catalytic ability of the catalytic system.By using sulfosalicylic acid as acidic ligand and the mole ratio of sulfosalicylic acid to Na2WSO4·2H2O was 1/1,the intermediate products of the catalytic oxidation reaction were analyzed by the GC-FTIR technique.the result showed that ε-caprolactone was the important stable intermediate product of the reaction.The possible mechanism was proposed.The cyclohexanone was oxidized by hydrogen peroxide to ε-caprolactone in the first step based on the Baeyer-Villiger oxidation mechanism,then the product from the rapid hydrolization of ε-caprolactone is oxidized to adipic acid.
