针对天基红外系统(Space Based Infrared System,SBIRS)三星探测弹道估计问题,提出GEO卫星与HEO卫星探测数据融合的估计算法。根据星座构成和探测体制,利用STK分析SBIRS对某一区域的覆盖能力,约43%的时间可以实现三星以上完全覆盖;建立...针对天基红外系统(Space Based Infrared System,SBIRS)三星探测弹道估计问题,提出GEO卫星与HEO卫星探测数据融合的估计算法。根据星座构成和探测体制,利用STK分析SBIRS对某一区域的覆盖能力,约43%的时间可以实现三星以上完全覆盖;建立三星探测数据融合算法模型,对导弹目标的运动状态进行实时估计,导弹运动建模采用当前统计模型,数据融合采用集中式结构,滤波算法采用无迹卡尔曼滤波。试验表明,与双星探测弹道估计误差相比,三星探测弹道估计误差显著减小。展开更多
Pd/TiO2 nanospheres assembled from nanorods with three-dimensional hyperstructure for enlianced photodegradation of organic dye was prepared by a sample solvothemial method. Further, it was used for degradation of met...Pd/TiO2 nanospheres assembled from nanorods with three-dimensional hyperstructure for enlianced photodegradation of organic dye was prepared by a sample solvothemial method. Further, it was used for degradation of methyl orange(MO) under the illumination of visible-light(simulated).The results show that Pd/TiO2 with 2%(mass fraction) Pd exhibits the noticeable activity in photodegrading of MO.The detailed analysis shows that this enhancement is attributed to the reduction of the rate of electron-hole recombination and surface plasmon resonance of Pd. The high activity and good stability of the obtained Pd/TiO2 nano spheres make it a promising photocatalyst for solving the environmental pollution problems.展开更多
Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the su...Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the surface of rod-like MA-NCC was confirmed by Fourier transfonn infrared spectrometry(FTIR). Sulfonated poly(aryl ether ether ketone ketone)(Ph-SPEEKK) was synthesized with bis(4-fluorophenyl-methanone) and 2-phenylhydroquinone as monomer. MA-NCC/Ph-SPEEKK nanocomposite membranes with different MA-NCCs content were prepared, and their properties were characterized. Compared with Ph-SPEEKK, MA-NCC/Ph-SPEEKK nanocomposite membrane showed better mechanical and thermal properties and higher proton conductivity. The proton conductivity of the composite membrane with 4%(mass fraction) MA-NCCs under 80℃ was 0.095 S/cm. And its tensile strength reached 30.3 MPa, which was 21.2% higher than that of Ph-SPEEKK pure polymer membrane.展开更多
文摘针对天基红外系统(Space Based Infrared System,SBIRS)三星探测弹道估计问题,提出GEO卫星与HEO卫星探测数据融合的估计算法。根据星座构成和探测体制,利用STK分析SBIRS对某一区域的覆盖能力,约43%的时间可以实现三星以上完全覆盖;建立三星探测数据融合算法模型,对导弹目标的运动状态进行实时估计,导弹运动建模采用当前统计模型,数据融合采用集中式结构,滤波算法采用无迹卡尔曼滤波。试验表明,与双星探测弹道估计误差相比,三星探测弹道估计误差显著减小。
基金Supported by the National Natural Science Foundation of China(No.51672103)the Science and Technology Development Project of Jilin Province, China(Nos.JJKH201805 85KJ,20190201286JC,20170101111JC).
文摘Pd/TiO2 nanospheres assembled from nanorods with three-dimensional hyperstructure for enlianced photodegradation of organic dye was prepared by a sample solvothemial method. Further, it was used for degradation of methyl orange(MO) under the illumination of visible-light(simulated).The results show that Pd/TiO2 with 2%(mass fraction) Pd exhibits the noticeable activity in photodegrading of MO.The detailed analysis shows that this enhancement is attributed to the reduction of the rate of electron-hole recombination and surface plasmon resonance of Pd. The high activity and good stability of the obtained Pd/TiO2 nano spheres make it a promising photocatalyst for solving the environmental pollution problems.
基金Supported by the National Natural Science Foundation of China(No.21404013)the Science and Technology Development Plan of Jilin Province, China(Nos.20160101323JC,20170101110JC,20180201075GX)+1 种基金the Project of tlie Jilin Provincial Development and Reform Commission,China(No.2018C041-1)the Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry of Chinese Academy of Sciences, and the Open Project of National & Local United Engineering Lab tor Power Battery(Northeast Nonnal University), China(No.130028822).
文摘Nanocellulose(NCC) was prepared through the acid hydrolysis of microcellulose(MCC) and was reacted with maleic anliydride to obtain carboxyl-functionized nanocellulose(MA-NCCs). The presence of .OH and .SO3H on the surface of rod-like MA-NCC was confirmed by Fourier transfonn infrared spectrometry(FTIR). Sulfonated poly(aryl ether ether ketone ketone)(Ph-SPEEKK) was synthesized with bis(4-fluorophenyl-methanone) and 2-phenylhydroquinone as monomer. MA-NCC/Ph-SPEEKK nanocomposite membranes with different MA-NCCs content were prepared, and their properties were characterized. Compared with Ph-SPEEKK, MA-NCC/Ph-SPEEKK nanocomposite membrane showed better mechanical and thermal properties and higher proton conductivity. The proton conductivity of the composite membrane with 4%(mass fraction) MA-NCCs under 80℃ was 0.095 S/cm. And its tensile strength reached 30.3 MPa, which was 21.2% higher than that of Ph-SPEEKK pure polymer membrane.
