孪生近端最小二乘支持向量回归机(twin proximal least squares support vector regression,TPLSSVR)是在PLSSVR模型的理论基础上结合TSVR模型的双超平面理念而设计的一种新的回归模型.本文利用TPLSSVR模型框架构建了基于高斯噪声的孪...孪生近端最小二乘支持向量回归机(twin proximal least squares support vector regression,TPLSSVR)是在PLSSVR模型的理论基础上结合TSVR模型的双超平面理念而设计的一种新的回归模型.本文利用TPLSSVR模型框架构建了基于高斯噪声的孪生近端最小二乘支持向量回归模型.该模型利用最小二乘方法,分别加入正则化项b_(1)^(2)、b_(2)_(2),将一个不等式约束问题转化为两个更简单的等式约束问题,提高了模型的泛化能力,有效提升了预测精度.为解决模型的参数选择问题,选用收敛速度快、鲁棒性好的粒子群优化算法对模型参数进行优化选择.将新构建的模型应用于人工数据集和风速数据集,实验结果显示该模型有较好的预测效果.展开更多
This study used nitrobenzene as the simulated pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O_3/H_2O_2 in high-gravity fields. The experiment results showe...This study used nitrobenzene as the simulated pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O_3/H_2O_2 in high-gravity fields. The experiment results showed that the highgravity technology could increase the nitrobenzene removal rate by improving the ozone transfer efficiency and ozone dissolution. Coexisting substances had different effects on the degradation kinetics of nitrobenzene in high-gravity fields. Among such substances, Na_2CO_3, NaOH, Na_3PO_4, and NaNO_3 accelerated the removal of nitrobenzene. The main action principle of nitrobenzene degradation by O_3/H_2O_2 is that the additives can increase the pH value of the solution, stimulate ozonolysis, generate hydroxyl radicals(·OH), and improve oxidation efficiency. By contrast, NaCl, NaHCO_3, NaHSO_4, ethanol(C_2H_5OH), acetic acid(CH_3COOH), formic acid(HCOOH), and tert-butyl alcohol(TBA) inhibited nitrobenzene removal. When NaHCO_3, CH_3COOH, or HCOOH were added, the pH value of the solution decreased and free radical chain reactions were hindered. However, NaCl, NaHCO_3, C_2H_5OH, and TBA consumed ·OH radicals and inhibited nitrobenzene removal.展开更多
Liu Li works in the No.2 Oil Extraction Plant of Daqing Oilfield, in Northeast China's Heilongjiang Province. Liu has received many awards and honorable titles, including National Labor Medal and National Technica...Liu Li works in the No.2 Oil Extraction Plant of Daqing Oilfield, in Northeast China's Heilongjiang Province. Liu has received many awards and honorable titles, including National Labor Medal and National Technical Expert. Liu, a technical expert with China National Petroleum Corporation, has a workshop under her name. Her story was highlighted on Craftsman of Great Powers, a program on CCTV (China Central Television) News. Liu says being a craftswoman in the new era requires certain attributes of “great power,” including “hardworking attitude, resilience to cope with challenges, a desire to solve difficulties, and courage to go through hardships.”展开更多
文摘孪生近端最小二乘支持向量回归机(twin proximal least squares support vector regression,TPLSSVR)是在PLSSVR模型的理论基础上结合TSVR模型的双超平面理念而设计的一种新的回归模型.本文利用TPLSSVR模型框架构建了基于高斯噪声的孪生近端最小二乘支持向量回归模型.该模型利用最小二乘方法,分别加入正则化项b_(1)^(2)、b_(2)_(2),将一个不等式约束问题转化为两个更简单的等式约束问题,提高了模型的泛化能力,有效提升了预测精度.为解决模型的参数选择问题,选用收敛速度快、鲁棒性好的粒子群优化算法对模型参数进行优化选择.将新构建的模型应用于人工数据集和风速数据集,实验结果显示该模型有较好的预测效果.
基金supported by the Natural Science Foundation of China(21206153,U1610106)the Excellent Youth Science and Technology Foundation of Province Shanxi of China(2014021007)the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi(201316)
文摘This study used nitrobenzene as the simulated pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O_3/H_2O_2 in high-gravity fields. The experiment results showed that the highgravity technology could increase the nitrobenzene removal rate by improving the ozone transfer efficiency and ozone dissolution. Coexisting substances had different effects on the degradation kinetics of nitrobenzene in high-gravity fields. Among such substances, Na_2CO_3, NaOH, Na_3PO_4, and NaNO_3 accelerated the removal of nitrobenzene. The main action principle of nitrobenzene degradation by O_3/H_2O_2 is that the additives can increase the pH value of the solution, stimulate ozonolysis, generate hydroxyl radicals(·OH), and improve oxidation efficiency. By contrast, NaCl, NaHCO_3, NaHSO_4, ethanol(C_2H_5OH), acetic acid(CH_3COOH), formic acid(HCOOH), and tert-butyl alcohol(TBA) inhibited nitrobenzene removal. When NaHCO_3, CH_3COOH, or HCOOH were added, the pH value of the solution decreased and free radical chain reactions were hindered. However, NaCl, NaHCO_3, C_2H_5OH, and TBA consumed ·OH radicals and inhibited nitrobenzene removal.
文摘Liu Li works in the No.2 Oil Extraction Plant of Daqing Oilfield, in Northeast China's Heilongjiang Province. Liu has received many awards and honorable titles, including National Labor Medal and National Technical Expert. Liu, a technical expert with China National Petroleum Corporation, has a workshop under her name. Her story was highlighted on Craftsman of Great Powers, a program on CCTV (China Central Television) News. Liu says being a craftswoman in the new era requires certain attributes of “great power,” including “hardworking attitude, resilience to cope with challenges, a desire to solve difficulties, and courage to go through hardships.”
