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| 1 | Numerical simulation of RCS for carrier electronic warfare airplanes显示文摘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 deflections 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 completes 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. | Yue Kuizhi Liu Wenlin Li Guanxiong Ji Jinzu Yu Dazhao | 2015 | Chinese Journal of Aeronautics2015，28，2： | 22 |
| 2 | Conceptual design and RCS performance research of shipborne early warning aircraft显示文摘In order to improve the survivability of the aircraft,conceptual design and radar cross section(RCS) performance research are done. The CATIA software is used to design the 3D digital model of the shipborne early warning aircraft, and some measures are taken to reduce the RCS characteristics of the early warning aircraft at the same time. Based on the physical optics method and the equivalent electromagnetic flow method,the aircraft's RCS characteristics and strength distribution characteristics are simulated numerically, and compared with the foreign advanced shipborne early warning aircraft. The simulation results show that under the X radar band, when the incident wave pitching angle is 0?, compared with the foreign advanced shipborne early warning aircraft, the forward RCS average value of the conceptual shipborne early warning aircraft is reduced to 24.49%, the lateral RCS average value is reduced to 5.04%, and the backward RCS average value is reduced to 39.26%. The research results of this paper are expected to provide theoretical basis and technical support for the conceptual design and the stealth design of the shipborne early warning aircraft. | Kuizhi Yue Yong Gao Guanxiong Li Dazhao Yu | 2014 | Journal of Systems Engineering and Electronics2014，25，6： | 6 |
| 3 | Analysis of the regional spectral properties in northwestern South China Sea based on an empirical orthogonal function显示文摘This study presents an analysis of the spectral characteristics of remote sensing reflectance(Rrs)in northwestern South China Sea based on the in situ optical and water quality data for August 2018.Rrswas initially divided into four classes,classes A to D,using the max-classification algorithm,and the spectral properties of whole Rrs were characterized using the empirical orthogonal function(EOF)analysis.Subsequently,the dominant factors in each EOF mode were determined.The results indicated that more than 95%of the variances of Rrs are partly driven by the back-scattering characteristics of the suspended matter.The initial two EOF modes were well correlated with the total suspended matter and back-scattering coefficient.Furthermore,the first EOF modes of the four classes of Rrs(A-D Rrs-EOF1)significantly contributed to the total variances of each Rrs class.In addition,the correlation coefficients between the amplitude factors of class A-D Rrs-EOF1 and the variances of the relevant water quality and optical parameters were better than those of the unclassified ones.The spectral shape of class ARrs-EOF1 was governed by the absorption characteristic of chlorophyll a and colored dissolved organic matter(CDOM).The spectral shape of class B Rrs-EOF1 was governed by the absorption characteristic of CDOM since it exhibited a high correlation with the absorption coefficient of CDOM(ag(λ)),whereas the spectral shape of class C Rrs-EOF1 was governed by the back-scattering characteristics but not affected by the suspended matter.The spectral shape of class D Rrs-EOF1 exhibited a relatively good correlation with all the water quality parameters,which played a significant role in deciding its spectral shape. | Dongyang Fu Yuye Huang Dazhao Liu Shan Liao Guo Yu Xiaolong Zhang | 2020 | Acta Oceanologica Sinica2020，39，7： | 3 |
| 4 | Effects of pitting corrosion on fatigue life of aluminum alloy LY12CZ based on initial discontinuity state显示文摘 | Yu Dazhao Chen Yueliang | 2006 | Transactions of Monferrous Metals Society of China2006，16，： | 1 |
| 5 | Stress intensity detemination for MSD riveted stiffened panels in the presence of corrosion显示文摘 | Yu Dazhao Chen Yueliang | 2007 | Key Engineering Materials2007，353，： | 1 |
| 6 | Effects of pitting corrosion on fatigue life of alloy LY12CZ based on initial discontinuity state 显示文摘 | Yu Dazhao Chen Yueliang Hu Jialin | 2006 | Transactions of Nonferrous Metals Society of China2006，16，5： | 1 |
| 7 | A novel high-voltage solid-state switch based on the SiC MOSFET series and its overcurrent protection显示文摘All-solid-state switches are one of the core components of pulsed power supply systems.However,the voltage level of a single switch is limited.By optimizing the chip structure,the voltage level of a single switch can be improved.Due to the immaturity of the production process and the positive correlation between the blocking voltage and the onresistance of the switch,it is difficult to improve the blocking voltage and the continuous forward current of a single switch simultaneously.The series-connected switch is a way to increase the switch's blocking voltage without reducing the switch's continuous forward current.Magnetically coupled isolated drive and resistor-capacitor forced voltage equalization techniques are investigated to increase the blocking voltage of the switches using multiple SiC metal-oxide-semiconductor field-effect transistors(MOSFETs)in series connections.Meanwhile,a special overcurrent protection scheme is designed to improve the reliability of the series-connected switch.Finally,a high-voltage solid-state switch is developed based on the SiC MOSFET series connections,whose output pulse width is adjustable from 20 to 300μs,frequency is adjustable from 1 Hz to 3 kHz,the maximum output voltage can reach 57 kV(1 Hz),and the overcurrent protection time is about 1μs. | Dazhao He Wenjie Sun Yixin Liao Penghao Zhang Liang Yu Shoulong Dong Chenguo Yao Xin liu | 2023 | High Voltage2023，8，4： | 1 |
| 8 | Molecular mapping of a novel wheat powdery mildew resistance gene Ml92145E8-9 and its application in wheat breeding by marker-assisted selection显示文摘Powdery mildew, caused by Blumeria graminis f. sp. tritici(Bgt), is one of the most devastating diseases of common wheat(Triticum aestivum L.). The wheat line 92145 E8-9 is immune to Bgt isolate E09. Genetic analysis reveals that the powdery mildew resistance in 92145 E8-9 is controlled by a single dominant gene, temporarily designated Ml92145 E8-9. Bulkedsegregant analysis(BSA) with simple sequence repeat(SSR) markers indicates that Ml92145 E8-9 is located on chromosome 2 AL. According to the reactions of 92145 E8-9,VPM1(Pm4 b carrier), and Lankao 906(PmLK906 carrier) to 14 Bgt isolates, the resistance spectrum of 92145 E8-9 differs from those of Pm4 b and PmLK906, both of which were previously localized to 2 AL. To test the allelism among Ml92145 E8-9, Pm4 b and PmLK906, two F2 populations of 92145 E8-9 × VPM1(Pm4 b) and 92145 E8-9 × Lankao 906(PmLK906) were developed in this study. Screening of 784 F2 progeny of 92145 E8-9 × VPM1 and 973 F2 progeny of 92145 E8-9 × Lankao 906 for Bgt isolate E09 identified 37 and 19 susceptible plants, respectively. These findings indicated that Ml92145 E8-9 is non-allelic to either Pm4 b or PmLK906. Thus, Ml92145 E8-9 is likely to be a new powdery mildew resistance gene on2 AL. New polymorphic markers were developed based on the collinearity of genomic regions of Ml92145 E8-9 with the reference sequences of the International Wheat Genome Sequencing Consortium(IWGSC). Ml92145 E8-9 was mapped to a 3.6 c M interval flanked by molecular markers Xsdauk13 and Xsdauk682. This study also developed five powdery mildew-resistant wheat lines(SDAU3561, SDAU3562, SDAU4173, SDAU4174, and SDAU4175)using flanking marker-aided selection. The markers closely linked to Ml92145 E8-9 would be useful in marker-assisted selection for wheat powdery mildew resistance breeding. | Xiaocheng Yu Shizhong Ren Lanfei Zhao Jun Guo Yinguang Bao Yingxue Ma Hongwei Wang Herbert W.Ohm Dazhao Yu Hongjie Li Lingrang Kong | 2018 | The Crop Journal2018，6，6： | 0 |
| 9 | Prospects of Biological Resources in Mitigating Agricultural Disasters | WANG Shaonan (1) , YE Zhihua (2) and YU Dazhao (1) ((1)Plant Protection Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064 (2)Science and Technology Administration Bureau, Chinese Academy of Agricultural Sciences) | 2001 | Natural Disaster Reduction in China2001，，2： | 0 |
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