目的 采用结合环论的粒子群优化算法(hybridization of ring theory-based evolutionary algorithm and particle swarm optimization, RTPSO)对数据进行均衡化处理,以构建高性能冠心病合并慢性心衰预后模型。方法 分别用SMOTE算法、RT...目的 采用结合环论的粒子群优化算法(hybridization of ring theory-based evolutionary algorithm and particle swarm optimization, RTPSO)对数据进行均衡化处理,以构建高性能冠心病合并慢性心衰预后模型。方法 分别用SMOTE算法、RTPSO算法对数据进行均衡化处理,在均衡化数据集上构建logistic回归、随机森林、支持向量机模型。结果 本研究共纳入2229例冠心病合并慢性心衰患者,依据筛选出的BMI、射血分数、N端前脑钠肽等22个变量构建模型。用灵敏度、特异度、准确率、F-measure和AUC值评价模型性能,其中RF、SVM、logistic回归、RF-RTPSO、SVM-RTPSO、Logistic-RTPSO灵敏度的中位数分别为0.0172、0.0773、0.0776、0.7568、0.7640、0.7838;F-measure的中位数分别为0.0338、0.1143、0.1283、0.3412、0.3505、0.4545;AUC的中位数分别为0.5086、0.5264、0.5313、0.8016、0.7785、0.7985。结论 RTPSO算法可以从多数类样本中选择有代表性的少数样本,从而达到数据均衡化,使分类模型具备更高的预测性能,指导临床医生发现高危患者,尽早预防不良事件的发生。展开更多
为探究HCl对费托合成钴基催化剂的中毒机制,采用HSC Chemistry 5.0软件对200℃~350℃范围内钴基催化剂HCl中毒热力学进行模拟计算。结果表明:钴基催化剂与HCl单独存在或与CO共存会引起中毒,其中毒产物以CoCl2为主;费托合成钴基催化剂中,...为探究HCl对费托合成钴基催化剂的中毒机制,采用HSC Chemistry 5.0软件对200℃~350℃范围内钴基催化剂HCl中毒热力学进行模拟计算。结果表明:钴基催化剂与HCl单独存在或与CO共存会引起中毒,其中毒产物以CoCl2为主;费托合成钴基催化剂中,HCl不会对载体SiO2产生影响。In order to investigate the poisoning mechanism of HCl on cobalt-based catalysts for Fischer-Tropsch synthesis, the thermodynamics of HCl poisoning of cobalt-based catalysts in the temperature range of 200˚C~350˚C was simulated by using HSC Chemistry 5.0 software. The results showed that coexistence of cobalt-based catalysts with HCl alone or with CO would be poisoned, and its toxic product was dominated by CoCl2;HCl would not affect SiO2 in Fischer-Tropsch synthesised cobalt-based catalysts.展开更多
烟气脱硫石膏是燃煤电厂烟气脱硫后产生的固态残渣,其年产量大且综合利用率低。文章着重介绍脱硫石膏在污水处理、二氧化碳的固定、制备硫酸钙晶须以及土壤改良的研究现状,并阐述在环境治理中的不足,以拓宽脱硫石膏的应用领域,提高利用...烟气脱硫石膏是燃煤电厂烟气脱硫后产生的固态残渣,其年产量大且综合利用率低。文章着重介绍脱硫石膏在污水处理、二氧化碳的固定、制备硫酸钙晶须以及土壤改良的研究现状,并阐述在环境治理中的不足,以拓宽脱硫石膏的应用领域,提高利用率,实现较高的社会效益、经济效益和环境效益。Flue gas desulfurization gypsum (FGDG) is a solid residue produced after flue gas desulphurisation in coal-fired power plants, with a large annual output and low comprehensive utilization rate. This paper highlights the current research status of FGDG in wastewater treatment, carbon dioxide fixation, preparation of calcium sulfate whiskers, and soil improvement, and elaborates on the deficiencies in environmental management, in order to broaden the application fields of FGDG, improve the utilization rate, and realize higher social, economic and environmental benefits.展开更多
文摘目的 采用结合环论的粒子群优化算法(hybridization of ring theory-based evolutionary algorithm and particle swarm optimization, RTPSO)对数据进行均衡化处理,以构建高性能冠心病合并慢性心衰预后模型。方法 分别用SMOTE算法、RTPSO算法对数据进行均衡化处理,在均衡化数据集上构建logistic回归、随机森林、支持向量机模型。结果 本研究共纳入2229例冠心病合并慢性心衰患者,依据筛选出的BMI、射血分数、N端前脑钠肽等22个变量构建模型。用灵敏度、特异度、准确率、F-measure和AUC值评价模型性能,其中RF、SVM、logistic回归、RF-RTPSO、SVM-RTPSO、Logistic-RTPSO灵敏度的中位数分别为0.0172、0.0773、0.0776、0.7568、0.7640、0.7838;F-measure的中位数分别为0.0338、0.1143、0.1283、0.3412、0.3505、0.4545;AUC的中位数分别为0.5086、0.5264、0.5313、0.8016、0.7785、0.7985。结论 RTPSO算法可以从多数类样本中选择有代表性的少数样本,从而达到数据均衡化,使分类模型具备更高的预测性能,指导临床医生发现高危患者,尽早预防不良事件的发生。
文摘为探究HCl对费托合成钴基催化剂的中毒机制,采用HSC Chemistry 5.0软件对200℃~350℃范围内钴基催化剂HCl中毒热力学进行模拟计算。结果表明:钴基催化剂与HCl单独存在或与CO共存会引起中毒,其中毒产物以CoCl2为主;费托合成钴基催化剂中,HCl不会对载体SiO2产生影响。In order to investigate the poisoning mechanism of HCl on cobalt-based catalysts for Fischer-Tropsch synthesis, the thermodynamics of HCl poisoning of cobalt-based catalysts in the temperature range of 200˚C~350˚C was simulated by using HSC Chemistry 5.0 software. The results showed that coexistence of cobalt-based catalysts with HCl alone or with CO would be poisoned, and its toxic product was dominated by CoCl2;HCl would not affect SiO2 in Fischer-Tropsch synthesised cobalt-based catalysts.
文摘烟气脱硫石膏是燃煤电厂烟气脱硫后产生的固态残渣,其年产量大且综合利用率低。文章着重介绍脱硫石膏在污水处理、二氧化碳的固定、制备硫酸钙晶须以及土壤改良的研究现状,并阐述在环境治理中的不足,以拓宽脱硫石膏的应用领域,提高利用率,实现较高的社会效益、经济效益和环境效益。Flue gas desulfurization gypsum (FGDG) is a solid residue produced after flue gas desulphurisation in coal-fired power plants, with a large annual output and low comprehensive utilization rate. This paper highlights the current research status of FGDG in wastewater treatment, carbon dioxide fixation, preparation of calcium sulfate whiskers, and soil improvement, and elaborates on the deficiencies in environmental management, in order to broaden the application fields of FGDG, improve the utilization rate, and realize higher social, economic and environmental benefits.
