复杂电磁环境下雷达抗干扰能力分析是雷达性能评估方面的新方向与新课题,是后续在雷达体系试验中开展电磁环境构建、体系效能评估、装备性能优化等重要基础,如何开展准确、定量的雷达抗干扰能力分析具有重要研究价值与意义。从资源调度...复杂电磁环境下雷达抗干扰能力分析是雷达性能评估方面的新方向与新课题,是后续在雷达体系试验中开展电磁环境构建、体系效能评估、装备性能优化等重要基础,如何开展准确、定量的雷达抗干扰能力分析具有重要研究价值与意义。从资源调度变化的动态角度切入,首先对跟踪制导雷达的主要工作模式,边扫描边跟踪(Track While Scan,TWS)和边跟踪边搜索(Track and Search,TAS)进行了对比分析。然后通过分析其内在机理,建立了基于最小干扰距离的雷达抗干扰能力量化模型,并在典型干扰场景下对雷达抗干扰能力进行了具体分析。最后结合仿真试验对所提方法进行了效果验证,可为后续雷达抗扰能力分析框架构建提供参考。展开更多
The thermal behaviors of the complexes of Cu(DMTZB)4X2 (DMTZB=3,3'-dimethyl-1-(1H-1,2,4-triazol-1- yl)-2-butanone, X=NO3 or ClO4) and Cu(DMTZB)2 X2 (X = Br or Cl) in a nitrogen atmosphere were studied un-der the ...The thermal behaviors of the complexes of Cu(DMTZB)4X2 (DMTZB=3,3'-dimethyl-1-(1H-1,2,4-triazol-1- yl)-2-butanone, X=NO3 or ClO4) and Cu(DMTZB)2 X2 (X = Br or Cl) in a nitrogen atmosphere were studied un-der the non-isothermal conditions by simultaneous TG-DTG-DSC, EDS and elemental analysis techniques. The re-sults showed that their decomposition proceeded in three different ways mainly depending on the anions in the molecules. The heat effect associated with the decomposition step of DMTZB molecules was also different. The decomposition mechanisms and the kinetic parameters of DMTZB were determined and calculated by jointly using four methods, which showed that its pyrolysis was controlled by D3 mechanism but with different activation ener-gies and pre-exponential factors for different complexes.展开更多
Synthesis and characterization of the ligand, 10-(-hexadecylcarboxymethyl)-1,4,7,10-tetraazacyclododecane- 1,4,7-triacetic acid (H4L), and its Gd(III) chelate are described. Protonation constants for H4L (HlgiK=10.52,...Synthesis and characterization of the ligand, 10-(-hexadecylcarboxymethyl)-1,4,7,10-tetraazacyclododecane- 1,4,7-triacetic acid (H4L), and its Gd(III) chelate are described. Protonation constants for H4L (HlgiK=10.52, 9.45, 4.74, 4.10) and the stability constant for GdL- (-GdLlg K=24.50) were determined by potentiometric titrations. The results obtained show that the ligand still maintains the strong chelating properties of the parent DOTA (1,4,7,10-tetraazacyclododecane-N,N',N''N'''-tetraacetic acid) after introduction of a linear chain hexadecyl group at the acetic side chain of DOTA, and its basicity is not significantly altered.展开更多
文摘复杂电磁环境下雷达抗干扰能力分析是雷达性能评估方面的新方向与新课题,是后续在雷达体系试验中开展电磁环境构建、体系效能评估、装备性能优化等重要基础,如何开展准确、定量的雷达抗干扰能力分析具有重要研究价值与意义。从资源调度变化的动态角度切入,首先对跟踪制导雷达的主要工作模式,边扫描边跟踪(Track While Scan,TWS)和边跟踪边搜索(Track and Search,TAS)进行了对比分析。然后通过分析其内在机理,建立了基于最小干扰距离的雷达抗干扰能力量化模型,并在典型干扰场景下对雷达抗干扰能力进行了具体分析。最后结合仿真试验对所提方法进行了效果验证,可为后续雷达抗扰能力分析框架构建提供参考。
文摘The thermal behaviors of the complexes of Cu(DMTZB)4X2 (DMTZB=3,3'-dimethyl-1-(1H-1,2,4-triazol-1- yl)-2-butanone, X=NO3 or ClO4) and Cu(DMTZB)2 X2 (X = Br or Cl) in a nitrogen atmosphere were studied un-der the non-isothermal conditions by simultaneous TG-DTG-DSC, EDS and elemental analysis techniques. The re-sults showed that their decomposition proceeded in three different ways mainly depending on the anions in the molecules. The heat effect associated with the decomposition step of DMTZB molecules was also different. The decomposition mechanisms and the kinetic parameters of DMTZB were determined and calculated by jointly using four methods, which showed that its pyrolysis was controlled by D3 mechanism but with different activation ener-gies and pre-exponential factors for different complexes.
基金Project supported by the Department of Science and Technology of Hunan Province (No. OOSSY 1013-51).
文摘Synthesis and characterization of the ligand, 10-(-hexadecylcarboxymethyl)-1,4,7,10-tetraazacyclododecane- 1,4,7-triacetic acid (H4L), and its Gd(III) chelate are described. Protonation constants for H4L (HlgiK=10.52, 9.45, 4.74, 4.10) and the stability constant for GdL- (-GdLlg K=24.50) were determined by potentiometric titrations. The results obtained show that the ligand still maintains the strong chelating properties of the parent DOTA (1,4,7,10-tetraazacyclododecane-N,N',N''N'''-tetraacetic acid) after introduction of a linear chain hexadecyl group at the acetic side chain of DOTA, and its basicity is not significantly altered.
