Some results from the theory of best (or best simultaneous) approximation in a narmed linear space have been extended to a normed almost linear space [strong normed almost linear space].
A special earth shock event was recorded at 22 counties of the 7 provinces of eastern China on October 6,1597,and 2 volcanic eruptions and seismic activities were recorded in Sanshui county,Xianjingbeidao,Korea atthat...A special earth shock event was recorded at 22 counties of the 7 provinces of eastern China on October 6,1597,and 2 volcanic eruptions and seismic activities were recorded in Sanshui county,Xianjingbeidao,Korea atthat day and the 3rd day. Because of the large range of this shock,low intensity,slow attenuation and no extreme-earthquake area,its epicenter and focus could not be determined on the scientific-technological conditions at thattime,In the Seismological Catalogue of China(GU,1983)published in 1983,its epicenter was determined to be inthe Bo Sea(38.5°N,120.0°E),its magnitude was 7;and it was changed into 7.5 in the later Seismological Cata-展开更多
To improve oil quality,ZSM-22/SAPO-11 composite molecular sieves were synthesized by adding ZSM-22 into a synthetic gel of SAPO-11 for n-decane hydroisomerization.The mass ratios of ZSM-22/(ZSM-22+SAPO-11)in the compo...To improve oil quality,ZSM-22/SAPO-11 composite molecular sieves were synthesized by adding ZSM-22 into a synthetic gel of SAPO-11 for n-decane hydroisomerization.The mass ratios of ZSM-22/(ZSM-22+SAPO-11)in the composite molecular sieves were optimized and the optimal ZSM-22/SAPO-11 composite(ZS-9)was obtained.The electrostatic repulsions between the ZSM-22 precursors and the SAPO-11 crystalline nuclei produced small ZSM-22 and SAPO-11 crystallites in ZS-9,which increased the specific surface area and mesopore volume and thereby exposed more acid sites.In comparison with conventional SAPO-11,ZSM-22 and their mechanical mixture,ZS-9 with smaller crystallites and the optimal medium and strong Brønsted acid centers(MSBAC)content displayed a higher yield of branched C_(10) isomers(81.6%),lower cracking selectivity(11.9%)and excellent stability.The correlation between the i-C_(10) selectivity and the MSBAC density of molecular sieves indicated that the selectivity for branched C_(10) isomers first increased and then decreased with increasing MSBAC density on the molecular sieves,and the maximum selectivity(87.7%)occurred with a density of 9.6×10^(−2)μmol m^(−2).展开更多
针对白天强光背景下强杂波图像序列,提出一种基于改进高阶相关法(modified high order correlationmethod,MHOCM)的杂波抑制和弱小目标检测方法.改进后的方法提出隔帧相关的组合方式,利用目标在连续多帧间具有持续强相关性的特点,通过...针对白天强光背景下强杂波图像序列,提出一种基于改进高阶相关法(modified high order correlationmethod,MHOCM)的杂波抑制和弱小目标检测方法.改进后的方法提出隔帧相关的组合方式,利用目标在连续多帧间具有持续强相关性的特点,通过迭代相关运算有效地抑制杂波,能在保持良好杂波剔除率的前提下将运算速度提高了两倍以上.在后续处理中,以形心代替原待识别目标进行识别,有效简化了识别过程并能快速剔除虚假目标.试验结果表明,改进高阶相关法能快速有效地抑制强杂波并检测出弱小目标.展开更多
文摘Some results from the theory of best (or best simultaneous) approximation in a narmed linear space have been extended to a normed almost linear space [strong normed almost linear space].
文摘A special earth shock event was recorded at 22 counties of the 7 provinces of eastern China on October 6,1597,and 2 volcanic eruptions and seismic activities were recorded in Sanshui county,Xianjingbeidao,Korea atthat day and the 3rd day. Because of the large range of this shock,low intensity,slow attenuation and no extreme-earthquake area,its epicenter and focus could not be determined on the scientific-technological conditions at thattime,In the Seismological Catalogue of China(GU,1983)published in 1983,its epicenter was determined to be inthe Bo Sea(38.5°N,120.0°E),its magnitude was 7;and it was changed into 7.5 in the later Seismological Cata-
基金The authors gratefully acknowledge the financial support of Science Foundation of China University of Petroleum,Beijing(Grant No.KYJJ2012-03-03).
文摘To improve oil quality,ZSM-22/SAPO-11 composite molecular sieves were synthesized by adding ZSM-22 into a synthetic gel of SAPO-11 for n-decane hydroisomerization.The mass ratios of ZSM-22/(ZSM-22+SAPO-11)in the composite molecular sieves were optimized and the optimal ZSM-22/SAPO-11 composite(ZS-9)was obtained.The electrostatic repulsions between the ZSM-22 precursors and the SAPO-11 crystalline nuclei produced small ZSM-22 and SAPO-11 crystallites in ZS-9,which increased the specific surface area and mesopore volume and thereby exposed more acid sites.In comparison with conventional SAPO-11,ZSM-22 and their mechanical mixture,ZS-9 with smaller crystallites and the optimal medium and strong Brønsted acid centers(MSBAC)content displayed a higher yield of branched C_(10) isomers(81.6%),lower cracking selectivity(11.9%)and excellent stability.The correlation between the i-C_(10) selectivity and the MSBAC density of molecular sieves indicated that the selectivity for branched C_(10) isomers first increased and then decreased with increasing MSBAC density on the molecular sieves,and the maximum selectivity(87.7%)occurred with a density of 9.6×10^(−2)μmol m^(−2).
文摘针对白天强光背景下强杂波图像序列,提出一种基于改进高阶相关法(modified high order correlationmethod,MHOCM)的杂波抑制和弱小目标检测方法.改进后的方法提出隔帧相关的组合方式,利用目标在连续多帧间具有持续强相关性的特点,通过迭代相关运算有效地抑制杂波,能在保持良好杂波剔除率的前提下将运算速度提高了两倍以上.在后续处理中,以形心代替原待识别目标进行识别,有效简化了识别过程并能快速剔除虚假目标.试验结果表明,改进高阶相关法能快速有效地抑制强杂波并检测出弱小目标.
