目的针对适用于中、小规模含硫井口气脱硫的Lo-cat液相氧化还原脱硫工艺,改善传统液相氧化还原脱硫剂存在的稳定性差、硫容量低、产物易堵塞设备等问题,进一步研发出更加绿色高效的湿法氧化还原脱硫剂体系。方法以N,N-二甲基甲酰胺(N,N-...目的针对适用于中、小规模含硫井口气脱硫的Lo-cat液相氧化还原脱硫工艺,改善传统液相氧化还原脱硫剂存在的稳定性差、硫容量低、产物易堵塞设备等问题,进一步研发出更加绿色高效的湿法氧化还原脱硫剂体系。方法以N,N-二甲基甲酰胺(N,N-Dimethylformamide,DMF)和水的混合物作为溶剂,加入氯化铜和螯合剂制备出绿色高效的铜基湿法氧化还原脱硫剂,对该脱硫剂的结构和热稳定性进行测定,开展脱硫实验,以考查不同种类的螯合剂、铜离子与螯合剂比例、温度、水含量及H2S气体流量对脱硫性能的影响,同时考查了吸收、再生过程中氧化还原电位和pH的变化规律及脱硫剂的重复脱硫性能。结果所研发的脱硫剂在60℃以下可稳定工作,最佳脱硫温度为40℃,在30 mL DMF+10 mL水所构成的脱硫溶液中,加入2 g CuCl2和2 g胺类螯合剂组成的脱硫剂具有相对较高的脱硫效果,硫容高达14.83 g/L。结论所研发的脱硫剂可在高效吸收H2S的同时得到较高的硫容量,可为天然气脱硫工艺提供参考。展开更多
Metal-insulator transition(MIT)in perovskite iridium oxides Sr_(n+1)IrnO_(3n+1)represents one of the most attractive phenomena exemplifying the cooperation of Coulomb interaction and spin-orbit coupling(SOC).MIT takes...Metal-insulator transition(MIT)in perovskite iridium oxides Sr_(n+1)IrnO_(3n+1)represents one of the most attractive phenomena exemplifying the cooperation of Coulomb interaction and spin-orbit coupling(SOC).MIT takes place when Sr_(n+1)IrnO_(3n+1)(n=1,2)is doped with carriers.While electron-doped Sr_(n+1)IrnO_(3n+1)(n=1,2)systems have been extensively investigated,hole-doped samples are still limited.Here,we report the first growth of Fe-doped(hole-doped)Sr_(3)Ir_(2)O_(7)single crystals[Sr_3(Ir_(1-x)Fe_x)_(2)O_(7)]with the doping level 0.1≤x≤0.28.An MIT behavior is observed at the doping level of x~0.16 from resistivity measurements.Electronic structures of Fe-doped Sr_(3)Ir_(2)O_(7)have been revealed by angle-resolved photoemission spectroscopy(ARPES)measurements.The evident energy shift of the band structure indicates higher hole-doping level as compared with Rh-doped Sr_(3)Ir_(2)O_(7).Our results demonstrate that Fe doping serves as an effective approach for heavily hole doping in Sr_(3)Ir_(2)O_(7),thereby offering a powerful strategy to modulate MIT in this material system.展开更多
文摘目的针对适用于中、小规模含硫井口气脱硫的Lo-cat液相氧化还原脱硫工艺,改善传统液相氧化还原脱硫剂存在的稳定性差、硫容量低、产物易堵塞设备等问题,进一步研发出更加绿色高效的湿法氧化还原脱硫剂体系。方法以N,N-二甲基甲酰胺(N,N-Dimethylformamide,DMF)和水的混合物作为溶剂,加入氯化铜和螯合剂制备出绿色高效的铜基湿法氧化还原脱硫剂,对该脱硫剂的结构和热稳定性进行测定,开展脱硫实验,以考查不同种类的螯合剂、铜离子与螯合剂比例、温度、水含量及H2S气体流量对脱硫性能的影响,同时考查了吸收、再生过程中氧化还原电位和pH的变化规律及脱硫剂的重复脱硫性能。结果所研发的脱硫剂在60℃以下可稳定工作,最佳脱硫温度为40℃,在30 mL DMF+10 mL水所构成的脱硫溶液中,加入2 g CuCl2和2 g胺类螯合剂组成的脱硫剂具有相对较高的脱硫效果,硫容高达14.83 g/L。结论所研发的脱硫剂可在高效吸收H2S的同时得到较高的硫容量,可为天然气脱硫工艺提供参考。
基金supported by the National Natural Science Foundation of China(Grant No.12074358)the National Key Research and Development Program of China(Grant No.2024YFA1408103)+2 种基金the International Partnership Program of the Chinese Academy of Sciences(Grant No.123GJHZ2022035MI)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302802)the Fundamental Research Funds for the Central Universities(Grant No.WK3510000015)。
文摘Metal-insulator transition(MIT)in perovskite iridium oxides Sr_(n+1)IrnO_(3n+1)represents one of the most attractive phenomena exemplifying the cooperation of Coulomb interaction and spin-orbit coupling(SOC).MIT takes place when Sr_(n+1)IrnO_(3n+1)(n=1,2)is doped with carriers.While electron-doped Sr_(n+1)IrnO_(3n+1)(n=1,2)systems have been extensively investigated,hole-doped samples are still limited.Here,we report the first growth of Fe-doped(hole-doped)Sr_(3)Ir_(2)O_(7)single crystals[Sr_3(Ir_(1-x)Fe_x)_(2)O_(7)]with the doping level 0.1≤x≤0.28.An MIT behavior is observed at the doping level of x~0.16 from resistivity measurements.Electronic structures of Fe-doped Sr_(3)Ir_(2)O_(7)have been revealed by angle-resolved photoemission spectroscopy(ARPES)measurements.The evident energy shift of the band structure indicates higher hole-doping level as compared with Rh-doped Sr_(3)Ir_(2)O_(7).Our results demonstrate that Fe doping serves as an effective approach for heavily hole doping in Sr_(3)Ir_(2)O_(7),thereby offering a powerful strategy to modulate MIT in this material system.
文摘目的:探讨3D成像技术在乳腺癌保乳术中的术前评估应用价值。方法:回顾性分析2017年4月至2019年1月武汉科技大学附属孝感医院38例在3D成像技术辅助下行乳腺癌保乳术患者的临床资料。所有患者术前均行3.0 T乳腺MRI检查,通过医学数字成像及通信(digital imaging and communication of medicine,DICOM)数据立体建模,构建3D成像技术重建虚拟图像。比较术前预计切除组织体积(predicted resected tissue volume,PRTV)及术中实际切除组织体积(actual resection tissue volume,ARTV)差异性及一致性,并行保乳术后组织标本切缘及乳房美学评价。结果:3D成像技术能准确反映乳腺、肿瘤、腺体及血管等解剖结构及其三维毗邻关系。术中所见与术前3D图像吻合度为97.4%(37/38)。术前PRTV为(61.7±20.1)m L,术中ARTV为(65.1±20.7)m L,两者比较差异无统计学意义(P>0.05),具有较好的一致性(P<0.01)。术后补充二次手术1例,发生率2.6%(1/38)。术后乳房外形满意度100%(38/38)。结论:3D成像技术可清晰地显示乳腺肿瘤与周围组织的解剖关系,准确评估保乳术切除体积,指导手术切除。
