This study analyzes the influence of TiO_(2) and Al_(2)O_(3) contents on the microstructure of CaO-SiO_(2)-MgO-xwt%Al_(2)O_(3)-ywt%TiO_(2)(14≤x≤22,0≤y≤10)blast furnace slag systems based on the change of slag visc...This study analyzes the influence of TiO_(2) and Al_(2)O_(3) contents on the microstructure of CaO-SiO_(2)-MgO-xwt%Al_(2)O_(3)-ywt%TiO_(2)(14≤x≤22,0≤y≤10)blast furnace slag systems based on the change of slag viscosity,Raman spectroscopy,and molecular dynamics.The Raman spectroscopy results indicate that an increase in TiO_(2) content leads to the gradual depolymerization of complex Q_(Si)^(3) Q_(Si)^(2) Q_(Si)^(0) Q_(Si)^(1)silicate structures(and)into simpler structures(and)in the slag.At the same time,the Al-O-Al bonds in the aluminate structures of the slag also depolymerize into simpler Al-O-forms,resulting in a decrease in the degree of polymerization of both silicates and aluminates.In contrast,an increase in Al_(2)O_(3) content generally results in an increased degree of polymerization for the silicates and aluminates.Molecular dynamics simulations of the polymerization and depolymerization processes in the microstructure of the blast fur-nace slag reveal that Si and Al mainly exist in tetrahedral[SiO_(4)]^(4-)and[AlO_(4)]^(4-),while Ti mainly exists in the form of simple pentaco-ordinate[TiO_(5)]^(6-)and hexacoordinate[TiO_(6)]^(8-).TiO_(2) exhibits basic properties in this system,whereas Al_(2)O_(3) demonstrates acidic behavior.The addition of TiO_(2) introduces free oxide ions into the system,causing the bridging oxygens to break into non-bridging oxygens,lead-Q_(Si)^(4) Q_(Si)^(3)ing to the depolymerization of complex structures and,which simplifies the slag structure.On the other hand,an increase in Al_(2)O_(3) content tends to capture or share the oxide ions within the system to form[AlO_(4)]^(4-),resulting in the polymerization of free oxygens into Q_(Si)^(0) Q_(Si)^(1)non-bridging oxygens,which further polymerize into bridging oxygens and lead to the consolidation of simple structures and,resulting in a more complex slag structure.Both Raman spectroscopy analysis and molecular dynamics simulation results indicate that the degree of polymerization of[SiO_(4)]^(4-) and[AlO_(4)]^(4-) in the slag network structure is a crucial factor determining the fluidity of the slag.展开更多
Ballistic target recognition occupies a unique and important position in many application fields of target recognition because of its challenge and important position of ballistic missile defense in national security;...Ballistic target recognition occupies a unique and important position in many application fields of target recognition because of its challenge and important position of ballistic missile defense in national security;recognition time of defense system becomes very limited because of ballistic missile high-speed flight;recognition distance of defense system is also due to stealth technology. The integrated application of active jamming and passive decoy greatly increases the difficulty of identification of defense system. Because of its special status and challenge, ballistic target recognition has attracted wide attention of researchers at home and abroad, making it one of the most important issues in infrared target recognition research at home and abroad. In this paper, the infrared characteristics of a ballistic missile warhead target/decoy are analyzed, and the corresponding penetration measures are put forward according to the analysis results.展开更多
In order to reduce the computational complexity of searching in massive information in detecting of warhead targets, background removal is usually the first step of target detection algorithm in sequential frame image...In order to reduce the computational complexity of searching in massive information in detecting of warhead targets, background removal is usually the first step of target detection algorithm in sequential frame images. In this paper, an adaptive multi-exposure time preserving star edge small area filtering background removal algorithm is proposed, which can suppress the back-ground and preserve the target and star edges. This algorithm not only ensures the accuracy of centroid and orbit determination, but also reduces false alarm and improves tracking accuracy.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52174299)the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,China(No.2024P4FZG10).
文摘This study analyzes the influence of TiO_(2) and Al_(2)O_(3) contents on the microstructure of CaO-SiO_(2)-MgO-xwt%Al_(2)O_(3)-ywt%TiO_(2)(14≤x≤22,0≤y≤10)blast furnace slag systems based on the change of slag viscosity,Raman spectroscopy,and molecular dynamics.The Raman spectroscopy results indicate that an increase in TiO_(2) content leads to the gradual depolymerization of complex Q_(Si)^(3) Q_(Si)^(2) Q_(Si)^(0) Q_(Si)^(1)silicate structures(and)into simpler structures(and)in the slag.At the same time,the Al-O-Al bonds in the aluminate structures of the slag also depolymerize into simpler Al-O-forms,resulting in a decrease in the degree of polymerization of both silicates and aluminates.In contrast,an increase in Al_(2)O_(3) content generally results in an increased degree of polymerization for the silicates and aluminates.Molecular dynamics simulations of the polymerization and depolymerization processes in the microstructure of the blast fur-nace slag reveal that Si and Al mainly exist in tetrahedral[SiO_(4)]^(4-)and[AlO_(4)]^(4-),while Ti mainly exists in the form of simple pentaco-ordinate[TiO_(5)]^(6-)and hexacoordinate[TiO_(6)]^(8-).TiO_(2) exhibits basic properties in this system,whereas Al_(2)O_(3) demonstrates acidic behavior.The addition of TiO_(2) introduces free oxide ions into the system,causing the bridging oxygens to break into non-bridging oxygens,lead-Q_(Si)^(4) Q_(Si)^(3)ing to the depolymerization of complex structures and,which simplifies the slag structure.On the other hand,an increase in Al_(2)O_(3) content tends to capture or share the oxide ions within the system to form[AlO_(4)]^(4-),resulting in the polymerization of free oxygens into Q_(Si)^(0) Q_(Si)^(1)non-bridging oxygens,which further polymerize into bridging oxygens and lead to the consolidation of simple structures and,resulting in a more complex slag structure.Both Raman spectroscopy analysis and molecular dynamics simulation results indicate that the degree of polymerization of[SiO_(4)]^(4-) and[AlO_(4)]^(4-) in the slag network structure is a crucial factor determining the fluidity of the slag.
文摘Ballistic target recognition occupies a unique and important position in many application fields of target recognition because of its challenge and important position of ballistic missile defense in national security;recognition time of defense system becomes very limited because of ballistic missile high-speed flight;recognition distance of defense system is also due to stealth technology. The integrated application of active jamming and passive decoy greatly increases the difficulty of identification of defense system. Because of its special status and challenge, ballistic target recognition has attracted wide attention of researchers at home and abroad, making it one of the most important issues in infrared target recognition research at home and abroad. In this paper, the infrared characteristics of a ballistic missile warhead target/decoy are analyzed, and the corresponding penetration measures are put forward according to the analysis results.
文摘In order to reduce the computational complexity of searching in massive information in detecting of warhead targets, background removal is usually the first step of target detection algorithm in sequential frame images. In this paper, an adaptive multi-exposure time preserving star edge small area filtering background removal algorithm is proposed, which can suppress the back-ground and preserve the target and star edges. This algorithm not only ensures the accuracy of centroid and orbit determination, but also reduces false alarm and improves tracking accuracy.
