This paper studies the radar cross section （RCS） of carrier electronic warfare airplanes. Under the typical naval operations section, the mathematical model of the radar wave＇s pitch angle incidence range analysis ...This paper studies the radar cross section （RCS） of carrier electronic warfare airplanes. Under the typical naval operations section, the mathematical model of the radar wave＇s pitch angle incidence range analysis is established. Based on the CATIA software, considering dynamic deflec- tions of duck wing leading edge flaps, flaperons, horizontal tail, and rudder, as well as aircraft with air-to-air missile, anti-radiation missile, electronic jamming pod, and other weapons, the 3D models of carrier electronic warfare airplanes Model A and Model B with weapons were established. Based on the physical optics method and the equivalent electromagnetic flow method, by the use of the RCSAnsys software, the characteristics of carrier electronic warfare airplanes＇ RCS under steady and dynamic flights were simulated under the UHF, X, and S radar bands. This paper researches the detection probability of aircraft by radars under the condition of electronic warfare, and com- pletes the mathematical statistical analysis of the simulation results. The results show that： The Model A of carrier electronic warfare airplane is better than Model B on stealth performance and on discover probability by radar detection effectively.展开更多
The models were established for the theoretical current-voltage characteristics in water dissociation process on a bipolar membrane. Particular attention was given to the transport of the water ions and electrolyte io...The models were established for the theoretical current-voltage characteristics in water dissociation process on a bipolar membrane. Particular attention was given to the transport of the water ions and electrolyte ions as well as the membrane physical structure and configuration. The factors on the water splitting process were adequately analysed based on the derived theoretical current-voltage characteristics and several good suggestions were proposed for decreasing the work voltage in practical operations. In addition, the model can give a reasonable explanation for the catalytic effect of some chemicals, such as amphiprotic hydroxide compounds, weak polymeric acids and bases, etc. It is shown that the catalyst may be responsible for the increase in dissociation rate constant of water and therefore enhance the water dissociation. The guidelines for choosing a proper catalyst were also proposed.展开更多
The description of complex configuration is a difficult issue.We present a powerful technique for cluster identification and characterization.The scheme is designed to treat and analyze the experimental and/or simulat...The description of complex configuration is a difficult issue.We present a powerful technique for cluster identification and characterization.The scheme is designed to treat and analyze the experimental and/or simulation data from various methods.The main steps are as follows.We first divide the space using face or volume elements from discrete points.Then,we combine the elements with the same and/or similar properties to construct clusters with special physical characterizations.In the algorithm,we adopt an administrative structure of a hierarchy-tree for spatial bodies such as points,lines,faces,blocks,and clusters.Two fast search algorithms with the complexity lnN are generated.The establishment of the hierarchy-tree and the fast searching of spatial bodies are general,which are independent of spatial dimensions.Therefore,it is easy to extend the method to other fields.As a verification and validation,we applied this method and analyzed some two-dimensional and three-dimensional random data.展开更多
基金supported by the National Natural Science Foundation of China (No.51375490)
文摘This paper studies the radar cross section （RCS） of carrier electronic warfare airplanes. Under the typical naval operations section, the mathematical model of the radar wave＇s pitch angle incidence range analysis is established. Based on the CATIA software, considering dynamic deflec- tions of duck wing leading edge flaps, flaperons, horizontal tail, and rudder, as well as aircraft with air-to-air missile, anti-radiation missile, electronic jamming pod, and other weapons, the 3D models of carrier electronic warfare airplanes Model A and Model B with weapons were established. Based on the physical optics method and the equivalent electromagnetic flow method, by the use of the RCSAnsys software, the characteristics of carrier electronic warfare airplanes＇ RCS under steady and dynamic flights were simulated under the UHF, X, and S radar bands. This paper researches the detection probability of aircraft by radars under the condition of electronic warfare, and com- pletes the mathematical statistical analysis of the simulation results. The results show that： The Model A of carrier electronic warfare airplane is better than Model B on stealth performance and on discover probability by radar detection effectively.
基金Project supported by the Youth Foundation of USTC[1999]the Foundation of the State Kay Lab. of Func. Poly. Materials for Adsor. & Sep., Nankai Univ. [1998]+1 种基金the Foundation of Post-doctoral of China (No. 1996(2))the National Natural Science Foun
文摘The models were established for the theoretical current-voltage characteristics in water dissociation process on a bipolar membrane. Particular attention was given to the transport of the water ions and electrolyte ions as well as the membrane physical structure and configuration. The factors on the water splitting process were adequately analysed based on the derived theoretical current-voltage characteristics and several good suggestions were proposed for decreasing the work voltage in practical operations. In addition, the model can give a reasonable explanation for the catalytic effect of some chemicals, such as amphiprotic hydroxide compounds, weak polymeric acids and bases, etc. It is shown that the catalyst may be responsible for the increase in dissociation rate constant of water and therefore enhance the water dissociation. The guidelines for choosing a proper catalyst were also proposed.
基金supported by the National Natural Science Foundation of China (Grant Nos 10702010 and 10775018)the Science Foundations of the Laboratory of Computational Physics and China Academy of Engineering Physics (Grant Nos.2009A0102005 and 2009B0101012)
文摘The description of complex configuration is a difficult issue.We present a powerful technique for cluster identification and characterization.The scheme is designed to treat and analyze the experimental and/or simulation data from various methods.The main steps are as follows.We first divide the space using face or volume elements from discrete points.Then,we combine the elements with the same and/or similar properties to construct clusters with special physical characterizations.In the algorithm,we adopt an administrative structure of a hierarchy-tree for spatial bodies such as points,lines,faces,blocks,and clusters.Two fast search algorithms with the complexity lnN are generated.The establishment of the hierarchy-tree and the fast searching of spatial bodies are general,which are independent of spatial dimensions.Therefore,it is easy to extend the method to other fields.As a verification and validation,we applied this method and analyzed some two-dimensional and three-dimensional random data.
