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Yongan Feng, Mucong Deng, Siwei Song, Sitong Chen, Qinghua Zhang, Jean’ne M. Shreeve
Engineering 2020, Volume 6, Issue 9, Pages 1006-1012 doi: 10.1016/j.eng.2020.01.013
The creation of high-performance energetic materials with good mechanical sensitivities has been a great challenge over the past decades, since such materials have huge amounts of energy and are thus essentially unstable. Here, we report on a promising fused-ring energetic material with an unusual twodimensional (2D) structure, 4-nitro-7-azido-pyrazol-[3,4-d]-1,2,3 triazine-2-oxide (NAPTO), whose unique 2D structure has been confirmed by single-crystal X-ray diffraction. Experimental studies show that this novel energetic compound has remarkably high energy (detonation velocity D = 9.12 km∙s−1; detonation pressure P = 35.1 GPa), excellent sensitivities toward external stimuli (impact sensitivity IS = 18 J; friction sensitivity FS = 325 N; electrostatic discharge sensitivity EDS = 0.32 J) and a high thermal decomposition temperature (203.2 °C), thus possessing the dual advantages of high energy and low mechanical sensitivities. To our knowledge, NAPTO is the first fused-ring energetic material with 2D layered crystal stacking. The stabilization mechanism toward external stimuli were investigated using molecular simulations, and the theoretical calculation results demonstrate that the ultraflat 2D layered structure can buffer external mechanical stimuli more effectively than other structures by converting the mechanical energy acting on the material into layer sliding and compression. Our study reveals the great promise of the fused-ring 2D layered structure for creating advanced energetic materials.
Keywords： Energetic materials Fused heterocycles 2D layered structure High energy Stability Sensitivity
A New Two_dimensional Linear Discriminant Analysis Algori thmBased on Fuzzy Set Theory
Zheng Yujie,Yang Jingyu,Wu Xiaojun, Li Yongzhi
Strategic Study of CAE 2007, Volume 9, Issue 2, Pages 49-53
2DLDA algorithm is based on2D matrices and overleaps the step of transforming the matrices into the corresponding vectors,which is done on conventional LDA algorithm.However,performance of recognition rate may always be degraded by the overlapping(outlier)samples et al in the field of pattern recognition.How to avoid these shortcomings and extract optimal features to improve the performance of recognition is a key step. In this paper,a new2DLDA algorithm,named fuzzy2DLDA,is proposed.Fuzzy k-nearest neighbour(FKNN) is implemented first to achieve the distribution information of original samples represented with fuzzy membership degrees and is incorporated into the process of feature extraction.The proposed algorithm inherits the virtue of conventional2DLDA and suppresses the shortcoming resulted by overlappin g(outlier)samples et al. Experimental results on AT&T face database demonstrate rec ognition rates of the proposed algorithm outperform that of conventional2DLDA and fisherface.
Keywords： two-dimensional linear discriminant analysis(2DLDA) fuzzy two-dimensional linear
The Application of Two Dimensions Wavelet in Image Edges Detection
Zhang Hongyan,Zhang Dengpan
Strategic Study of CAE 2003, Volume 5, Issue 4, Pages 61-64
Edges as the main characterization of image vision have been throught as the main content in obtaining image information. Wavelet transform has the capacity for detecting local signal mutation and detects information using multiscale character, so it is taken as the excellent tool to detect the edges of the image information. This paper analyzes the basic theory using two dimensions wavelet to detect image edges on the basis of wavelet transform and then designs the detecting algorithm of the multi-scale edge matching. On the basis of researching results,the application programme is made to analyse the true examples.
Keywords： wavelet transform multi-scale edges detection
Li Daming、Lin Yi、Zhou Zhihua
Strategic Study of CAE 2010, Volume 12, Issue 3, Pages 82-89
Based on the overlapped conditions on complex river network and basin, a 1D and 2D flood routing model which is based on water-resistance structure of railways, roads, embankment and mobile boundary to realize timely flood regulation in basins of the detention basin was proposed. The model was calculated by using the finite volume method (FVM). A corresponding simulation system of the 1D and 2D flood routing model was set up in consideration of the total frame of flood optimization regulation. Any position's water level, flow speed, water height and submerged time can be acquired from it. The system was used in Dongdian Basin, and reasonable agreement was found between the measured data and the calculated data of Daqing River. The system was also used to simulate the program of five basins combined-regulation in Daqing River Basin, and to analyze the return basin phenomenon, comparing different cases .
Keywords： detention basin flood routing 1D and 2D numerical simulation finite volume method combined-regulation
Performance Optimization Analysis of 2D - OOSC Codeword for OCDMA System
Li Chuanqi,Sun Xiaohan,Zhang Mingde,Ding Dong
Strategic Study of CAE 2003, Volume 5, Issue 4, Pages 50-54
The scheme of 2-dimensions optical orthogonal square codes (2D - OOSC) in optical code-division multiple-access (OCDMA) networks is given in this paper. The influence of coding parameters to the performance of the system is mainly discussed. It is proved that the relativity of the codeword satisfies the system requirement, and the system BER based on multiple user interference is ascertained. The results indicate that the number of simultaneous users that can be contained in this system will be much larger than that in the system with ID-OOC under the same conditions, the total transmitting capacity of the system will reach the level of Tb/s, and the performance of 2D — OOSC system will be largely enhanced, especially under the heavy transmitting traffic.
Keywords： optical code division multiple access (OCDMA) 2-dimensions optical orthogonal square codes (2D-OOSC) multi-users interfering (MUI) based bit-error-ratio (BER)
Preparation of ultrathin ReS2 nanosheets and their application to Q-switched Er-doped fiber lasers Research
Junshan He, Guohua Zeng, Shaoxian Liu, Haiming Lu, Ruixian Xie, Jingjing Qi, Lili Tao, Bo Zhou,taoll@gdut.edu.cn,zhoubo@scut.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3, Pages 287-436 doi: 10.1631/FITEE.2000339
Keywords： 二硫化铼；可饱和吸收体；二维材料；调Q光纤激光器
Influence Factors for Distribution of Smoke Concentration in Small-scale Experiment
Huang Rui,Yang Lizhong,Feng Wenxing,Fang Tingyong,Fan Weicheng
Strategic Study of CAE 2003, Volume 5, Issue 8, Pages 54-58
Through using Lagrange interpolation to analyze the limited data of smoke components and concentration attained from the small-scale experiments, it shows the distribution of smoke concentration at same time from different positions and the distribution of smoke concentration field according to time. Considering the random factors existing in these combustion experiments, concentration relative value is provided to contrast data among different experiments. The result shows that distribution of smoke concentration along hallway is mainly affected by mass of fuel and height of the door.
Keywords： smoke 2-dimensional interpolation multipoint measurement
Doppler ambiguity analysis and suppression for LTE-based passive bistatic radars Research Articles
Luo Zuo, Jun Wang, Gang Chen,zuoluo_xidian@163.com,wangjun@xidian.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8, Pages 1140-1152 doi: 10.1631/FITEE.2000143
Keywords： 外辐射源雷达（PBR）；长期演进（LTE）；多普勒模糊副峰；距离多普勒二维联合
Principle and status of technique of smoothed particle hydrodynamics and heat conduction model
Wang Yuheng,Liu Feng,Song Fengmei
Strategic Study of CAE 2008, Volume 10, Issue 11, Pages 47-51
The article is a summary about the basic theory and the developing status of technique of smoothed particle hydrodynamics (SPH).Two typical examples of two dimensions nonlinear dynamics have been simulated numerically by SPH in the article. Otherwise, the SPH model on heat conduction problem has been discussed.
Keywords： SPH two dimensions nonlinear dynamics heat conduction model numerical simulations
Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement Correspondence
Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 4, Pages 626-632 doi: 10.1631/FITEE.2200290
Keywords： 太赫兹通信；反射系数建模；入射角；建筑材料；菲涅耳模型
Two dimensional value simulation of shallow water equation
Xiang Bo,Mi Xiao,Ji Changming,Luo Qingsong
Strategic Study of CAE 2008, Volume 10, Issue 7, Pages 118-124
The unstructured triangular mesh adapts to complex irregular boundary.Based on this,adopting finite volume method to disperse shallow water equation and combining with the finite difference method, this paper has developed a new discrete format that caused the interface flux to achieve second-order precision. To verify the model established, this paper has simulated and calculated the two-dimensional curve course and some two-dimensional flow of dam-break separately, and obtained preferable results comparing with other methods.
Keywords： shallow water equation finite volume method unstructured mesh dam-break
Current Trends in Pickering Emulsions: Particle Morphology and Applicatio Review
Danae Gonzalez Ortiz, Celine Pochat-Bohatier, Julien Cambedouzou, Mikhael Bechelany, Philippe Miele
Engineering 2020, Volume 6, Issue 4, Pages 468-482 doi: 10.1016/j.eng.2019.08.017
In recent years, Pickering emulsions and their applications have attracted a great deal of attention due to their special features, which include easy preparation and enhanced stability. In contrast to classical emulsions, in Pickering emulsions, solid microparticles or nanoparticles that localize at the interface between liquids are used as stabilizers, instead of surfactants, to enhance the droplet lifetime. Furthermore, Pickering emulsions show higher stability, lower toxicity, and stimuli-responsiveness, compared with emulsions that are stabilized by surfactants. Therefore, they can be considered attractive components for various uses, such as photocatalysis and the preparation of new materials. Moreover, the nanoparticle morphology strongly influences Pickering emulsion stability as well as the potential utilization of such emulsions. Here, we review recent findings concerning Pickering emulsions, with a particular focus on how the nanoparticles morphology (i.e., cube, ellipsoid, nanosheet, sphere, cylinder, rod, peanut) influences the type and stability of such emulsions, and their current applications in different fields such as antibacterial activity, protein recognition, catalysis, photocatalysis, and water purification.
Keywords： Pickering emulsions Particle morphology 2D nanoparticles Photocatalysis Water filtration
Two-dimensional Controllable Cellular Automata BasedPseudo Random Bit Sequence Generator
Zhu Baoping,Ma Qian,Liu Fengyu
Strategic Study of CAE 2007, Volume 9, Issue 6, Pages 43-47
A novel cellular automata (CA) — two-dimensional controllable CA — is proposed in this paper. According to characteristics of two-dimensional controllable CA, a pseudo random generating method based on two-dimensional controllable CA with a trapezoidal structure is presented. Simulation demonstrates that pseudo random bit sequence generator based on the two-dimensional controllable CA with a trapezoidal structure is easily implemented, and can generate high speed bit sequence and excellent statistical properties. This novel CA is widely used in symmetrical cryptography.
Keywords： cellular automata pseudorandom number generators controllable cryptography
Wu Xiuguang,Shen Yongming,Wang Min,Yang Zhifeng
Strategic Study of CAE 2005, Volume 7, Issue 7, Pages 60-64
The shallow-water equations and pollutant convective-diffusive equation are transformed into curvilinear coordinate system. The anisotropic algebraic-stress turbulent model is introduced to simulate the turbulence items, and algebraic-stress turbulent model of planar 2-D pollutant convection-diffusion in curvilinear coordinates is built. The meandering channel with measured data of concentration in lab is adopted to validate the model. The comparison between the distribution figure of pollutant concentration field calculated through this model and that of the k-ε model shows the model in the paper is superior to k-ε turbulent model in dealing with anisotropy.
Keywords： pollutant convection-diffusion anisotropic algebraic-stress turbulent model k-ε model
Stepped frequency chirp signal imaging radar jamming using two-dimensional nonperiodic phase modulation Research Article
Qihua WU, Feng ZHAO, Tiehua ZHAO, Xiaobin LIU, Junjie WANG, Shunping XIAO
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 3, Pages 433-446 doi: 10.1631/FITEE.2200298
Keywords： Radar jamming Stepped frequency chirp signal Nonperiodic phase modulation Wideband radar
Title Author Date Type Operation
Construction of an Unusual Two-Dimensional Layered Structure for Fused-Ring Energetic Materials with High Energy and Good Stability
Yongan Feng, Mucong Deng, Siwei Song, Sitong Chen, Qinghua Zhang, Jean’ne M. Shreeve
Journal Article
A New Two_dimensional Linear Discriminant Analysis Algori thmBased on Fuzzy Set Theory
Zheng Yujie,Yang Jingyu,Wu Xiaojun, Li Yongzhi
Journal Article
The Application of Two Dimensions Wavelet in Image Edges Detection
Zhang Hongyan,Zhang Dengpan
Journal Article
Research on 1D and 2D numerical simulation of flood routing and its application of combined-regulation in detention basin
Li Daming、Lin Yi、Zhou Zhihua
Journal Article
Performance Optimization Analysis of 2D - OOSC Codeword for OCDMA System
Li Chuanqi,Sun Xiaohan,Zhang Mingde,Ding Dong
Journal Article
Preparation of ultrathin ReS2 nanosheets and their application to Q-switched Er-doped fiber lasers
Junshan He, Guohua Zeng, Shaoxian Liu, Haiming Lu, Ruixian Xie, Jingjing Qi, Lili Tao, Bo Zhou,taoll@gdut.edu.cn,zhoubo@scut.edu.cn
Journal Article
Influence Factors for Distribution of Smoke Concentration in Small-scale Experiment
Huang Rui,Yang Lizhong,Feng Wenxing,Fang Tingyong,Fan Weicheng
Journal Article
Doppler ambiguity analysis and suppression for LTE-based passive bistatic radars
Luo Zuo, Jun Wang, Gang Chen,zuoluo_xidian@163.com,wangjun@xidian.edu.cn
Journal Article
Principle and status of technique of smoothed particle hydrodynamics and heat conduction model
Wang Yuheng,Liu Feng,Song Fengmei
Journal Article
Frequency–angle two-dimensional reflection coefficient modeling based on terahertz channel measurement
Zhaowei CHANG, Jianhua ZHANG, Pan TANG, Lei TIAN, Li YU, Guangyi LIU, Liang XIA,changzw12345@bupt.edu.cn,jhzhang@bupt.edu.cn
Journal Article
Two dimensional value simulation of shallow water equation
Xiang Bo,Mi Xiao,Ji Changming,Luo Qingsong
Journal Article
Current Trends in Pickering Emulsions: Particle Morphology and Applicatio
Danae Gonzalez Ortiz, Celine Pochat-Bohatier, Julien Cambedouzou, Mikhael Bechelany, Philippe Miele
Journal Article
Two-dimensional Controllable Cellular Automata BasedPseudo Random Bit Sequence Generator
Zhu Baoping,Ma Qian,Liu Fengyu
Journal Article
Algebraic-stress Turbulent Model of Planar 2-D Pollutant Convection-Diffusion in Curvilinear Coordinates
Wu Xiuguang,Shen Yongming,Wang Min,Yang Zhifeng
Journal Article
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