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| 1 | A coupled convolutional neural network for small and densely clustered ship detection in SAR images显示文摘Ship detection from synthetic aperture radar(SAR) imagery plays a significant role in global marine surveillance. However, a desirable performance is rarely achieved when detecting small and densely clustered ship targets, and this problem is difficult to solve. Recently, convolutional neural networks(CNNs)have shown strong detection power in computer vision and are flexible in complex background conditions,whereas traditional methods have limited ability. However, CNNs struggle to detect small targets and densely clustered ones that exist widely in many SAR images. To address this problem while preserving the good properties for complex background conditions, we develop a coupled CNN for small and densely clustered SAR ship detection. The proposed method mainly consists of two subnetworks: an exhaustive ship proposal network(ESPN) for ship-like region generation from multiple layers with multiple receptive fields, and an accurate ship discrimination network(ASDN) for false alarm elimination by referring to the context information of each proposal generated by ESPN. The motivation in ESPN is to generate as many ship proposals as possible, and in ASDN, the goal is to obtain the final results accurately. Experiments are evaluated on two data sets. One is collected from 60 wide-swath Sentinel-1 images and the other is from20 GaoF en-3(GF-3) images. Both data sets contain many ships that are small and densely clustered. The quantitative comparison results illustrate the clear improvements of the new method in terms of average precision(AP) and F 1 score by 0.4028 and 0.3045 for the Sentinel-1 data set compared with the multi-step constant false alarm rate(CFAR-MS) method. The values are verified as 0.2033 and 0.1522 for the GF-3 data set. In addition, the new method is demonstrated to be more efficient than CFAR-MS. | Juanping ZHAO Weiwei GUO Zenghui ZHANG Wenxian YU | 2019 | Science China(Information Sciences)2019，62，4： | 10 |
| 2 | Effect of Trace Sc and Zr on the Mechanical Properties and Microstructure of A1 Alloy 2618显示文摘An experimental 2618(Al-Cu-Mg-Fe-Ni) alloy added with trace Sc and Zr was prepared by ingot metallurgy (IM) method. The aging behavior of the alloy was studied by Vickers hardness measurement at 200℃ and 300℃. and the tensile properties of alloy specimens were measured at 20℃, 200℃, 250℃ and 300℃. The microstructure was observed by using optical microscope, SEM and TEM. It was found that the addition of Sc and Zr to 2618 alloy resulted in a primary Al3(Sc,Zr) phase which could refine the grain because it acts as nuclei of heterogeneous crystallization in the melt during solidification. The secondary Al3(Sc,Zr) particles were full coherent with matrix and had obvious precipitation hardening effect. They also made the S’ phase precipitate more homogeneous. So the strength of alloy increases at both ambient and elevated temperatures without a decrease of ductility. The ductile fracture of alloy occurs by microvoid nucleation, growth and coalescence, so the microvoid coalescence is the dominant fracture mechanism. | Kun YU, Songrui LI and Wenxian LI (Department of Materials Science and Engineering, Central South University of Technology, Changsha 410083, China) | 2000 | Journal of Materials Science & Technology2000，16，4： | 6 |
| 3 | Effect of trace Sc and Zr on aging behavior and tensile properties of 2618 alloy显示文摘The aging behavior of 2618 (Al Cu Mg Fe Ni) alloy added trace Sc and Zr was studied by Vicker’s hardness measurement at 200 and 300 ℃, and the tensile properties(yield strength, ultimate tensile strength and elongation) of alloys were measured at 20, 200, 250 and 300 ℃. The microstructures were observed by using optical microscope, SEM and TEM. It was found that the addition of Sc and Zr to 2618 alloy resulted in a uniform distribution of fine coherent Al 3(Sc,Zr) precipitates which had obvious aging hardening effect and made the S’ phase precipitate more homogeneously. The strength of alloy increased at ambient and elevated temperature without a decrease of ductility because of the precipitation strengthening and thermal stability of Al 3(Sc,Zr) particles. The ductile fracture of alloy occurred by microviod nucleation, growth and coalescence, so the microvoid coalescence was the dominant fracture mechanism. Al 3(Sc,Zr) particles could inhabit the recrystallization process of alloy 2618. | Yu Kun(余琨) Li Songrui(李松瑞) Li Wenxian(黎文献) Xiao Yude(肖于德) | 1999 | 中国有色金属学会会刊:英文版1999，9，3： | 5 |
| 4 | Novel cued search strategy based on information gain for phased array radar显示文摘A search strategy based on the maximal information gain principle is presented for the cued search of phased array radars. First, the method for the determination of the cued search region, arrangement of beam positions, and the calculation of the prior probability distribution of each beam position is discussed. And then, two search algorithms based on information gain are proposed using Shannon entropy and Kullback-Leibler entropy, respectively. With the proposed strategy, the information gain of each beam position is predicted before the radar detection, and the observation is made in the beam position with the maximal information gain. Compared with the conventional method of sequential search and confirm search, simulation results show that the proposed search strategy can distinctly improve the search performance and save radar time resources with the same given detection probability. | Lu Jianbin Hu Weidong Xiao Hui Yu Wenxian | 2008 | Journal of Systems Engineering and Electronics2008，19，2： | 4 |
| 5 | Single-cell RNA-seq analysis of testicular somatic cell development in pigs显示文摘Spermatogenesis is the process by which diploid male germ cells propagate and differentiate into haploid flagellated spermatozoa.This highly complicated process is dependent on testicular somatic cells maturation.While the role of these somatic cells in spermatogenesis is relatively well established,knowledge about their development and maturation,particularly at the molecular level,is limited.In this study,we profiled the testicular single-cell transcriptomes of Guanzhong black pigs at the age of 7,30,60,90,and 150 days.Five types of Sertoli cells,five types of Leydig cells,and four types of peritubular myoid cells were identified.Histological analysis revealed the changes in proliferation levels and marker gene expressions,and the prion-like protein gene(PRND)was identified as a novel marker for Sertoli cells.Additionally,integrated analyses of porcine and human datasets revealed similarities between human and pig testicular somatic cells.Overall,the data obtained in this study contribute to the understanding of testicular development in pigs as a model species. | Lingkai Zhang Ming Guo Zidong Liu Ruifang Liu Yi Zheng Taiyong Yu Yinghua Lv Hongzhao Lu Wenxian Zeng Tao Zhang Chuanying Pan | 2022 | Journal of Genetics and Genomics2022，49，11： | 4 |
| 6 | Implementing a topological quantum model using a cavity lattice显示文摘Kitaev model has both Abelian and non-Abelian anyonic excitations.It can act as a starting point for topological quantum computation.However,this model Hamiltonian is difficult to implement in natural condensed matter systems.Here we propose a quantum simulation scheme by constructing the Kitaev model Hamiltonian in a lattice of coupled cavities with embedded Λ-type three-level atoms.In this scheme,several parameters are tunable,for example,via external laser fields.Importantly,our scheme is based on currently existing technologies and it provides a feasible way of realizing the Kitaev model to explore topological excitations. | XIANG ZeLiang YU Ting ZHANG WenXian HU XueDong YOU JianQiang | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，9： | 4 |
| 7 | Activation of anterior thalamic reticular nucleus GABAergic neurons promotes arousal from propofol anesthesia in mice显示文摘Propofol is widely used for the induction and maintenance of anesthesia,which causes a rapid loss of consciousness.However,the mechanisms underlying the hypnosis effect of propofol are still not fully understood.The thalamic reticular nucleus(TRN)is crucial for regulating wakefulness,sleep rhythm generation,and sleep stability,while the role of TRN in the process of propofol-induced anesthesia is still unknown.Here,we investigated the function of the anterior TRN in propofol general anesthesia.Our results demonstrated that the neural activity of anterior TRN is suppressed during propofol anesthesia,whereas it is robustly activated from anesthesia by recording the calcium signals using fiber photometry technology.The results showed that the activation of anterior TRN neurons by chemogenetic and optogenetic methods shortens the emergency time without changing the induction time.Conversely,chemogenetic or optogenetic inhibition of the TRN neurons leads to a delay in the recovery time.Our study showed that anterior TRN is crucial for behavioral arousal without affecting the induction time of propofol anesthesia. | Yanjun Liu Bing Chen Yirong Cai Yuan Han Ying Xia Nanqi Li Bingqian Fan Tianjie Yuan Junli Jiang Po Gao Weifeng Yu Yingfu Jiao Wenxian Li | 2021 | Acta Biochimica et Biophysica Sinica2021，53，7： | 3 |
| 8 | Ala-Gln improves varicocele-induced testicular injury by increasing HSP70 and antioxidant activity in male rats显示文摘This worked aimed to test the hypothesis that L-alanyl-L-glutamine(Ala-Gln)improves the varicocele-induced testicular injury,which causes male infertility.For this purpose,fifty adult male Wistar rats received the varicocele(VC)surgery at the left renal vein.Biomarkers were determined 2,4,and 8 weeks after VC(n=10/each detection).Four weeks after VC,rats received Ala-Gln(1.125 g/kg)treatment with and or saline for 1 week(n=10/each group).Rats in the sham group were also detected for biomarkers at 2,4,and 8 weeks(n=10/each detection).VC caused testicular injury detected by hematoxylin–eosin(H&E)staining,immunohistochemistry,and TUNEL assay.HSP70 mRNA was detected quantitative RT-PCR,SOD,and CAT by nitroblue tetrazolium(NBT)method and 8-OHDG by ELISA.The results showed that varicocele induced injury in the testes.The weight of the left testes was lower than that of the right testes in VC-bearing rats(p<0.01).The relative numbers of sustentacular and spermatogenic cells were decreased after VC(p<0.01).In sham-4 wk,VC-4wk,VC-5wk and Ala-Gln groups,the apoptosis index was 5.10±1.14,13.22±3.63,33.62±3.56 and 22.33±2.61,relative level of HSP70 mRNA 1.00±0.12,0.53±0.05,0.51±0.04 and 1.62±0.15 fold,SOD 16.4±0.23,13.4±0.17,10.01±1.06 and 19.53±2.26 U/mg protein,CAT 2.16±0.31,1.07±0.28,and 1.31±0.26 and 3.46±0.71 U/mg,8-OHDG 5.23±0.67,6.81±0.78,7.16±1.22 and 4.14±0.73 pg/μg DNA,respectively(p<0.01).Our results suggest that Ala-Gln prevented the VC-induced testicular injury.We have firstly reported that Ala-Gln protects against varicocele-induced testicular injuries by up-regulation of HSP70 and antioxidants,SOD and CAT,and down-regulation of oxidant 8-OHDG,resulting in reducing apoptosis in the testis. | LEI YU ZHEN FAN HONGQIANG WANG WENXIAN LI TAO JING QIANG LI SHENQIAN LI PEITAO WANG XUJUN XUAN | 2021 | BIOCELL2021，45，2： | 3 |
| 9 | Hippocampus is more vulnerable to neural damages induced by repeated sevoflurane exposure in the second trimester than other brain areas显示文摘During the rapidly developing and sensitive period of the central nervous system (CNS), a harmful stimulus may have serious consequences. The effect of anesthetic exposure on the development of the offspring’s CNS during pregnancy is still unclear and has been widely concerned. In the present study, we compared the susceptibility of the hippocampus with those of other brain regions in offsprings when the mother mice were exposed to repeated sevoflurane. We found that other than affecting motor sensation, emotion, or social behavior of offspring mice, repeated sevoflurane exposure induced significant memory deficiency. Compared with other brain regions, the hippocampus, which is the key component of the brain serving for learning and memory, was more vulnerable to repeated sevoflurane exposure. We also found that repeated sevoflurane exposure to mother mice could inhibit the axon development of hippocampal neurons. We also predicted that N6-methyladenosine modification of mRNA might play an essential role in the vulnerability of the hippocampus to sevoflurane, while the underlying cellular mechanism needs to be explored in the future. Our study may provide a new perspective for studying the mechanism of hippocampus-specific injury induced by sevoflurane exposure. | Bing Chen Yanjun Liu Yirong Cai Dan Tang Saihong Xu Po Gao Weifeng Yu Yingfu Jiao Wenxian Li | 2020 | Acta Biochimica et Biophysica Sinica2020，52，8： | 3 |
| 10 | Multi-channel radar array design method and algorithm显示文摘The array design of radar antenna is no more a new problem at all. Nevertheless, the array design of multi-channel radar, especially that of MIMO (multiple-input multiple-output) radar, is a new problem. The performance of space diversion and spatial sampling of target scattering are dependent on the array design of MIMO radar, and consequently, which in turn will determine the performances of target parameter estimation, DOA, and imaging. In this paper, commencing with target scattering model, T/R signal model of MIMO radar, and spatial sampling ability for this system are analyzed. Conceptually, under the far field condition, spatial convolution principle determines the array design theory. Based on this idea, array design method and also algorithm are proposed in this paper. | SU Yi ZHU YuTao YU WenXian XU HongBo LEI WenTai | 2010 | Science China(Information Sciences)2010，53，7： | 3 |
| 11 | Production,Properties and Microstructures of Mg-RE-Zn-Zr(RE=MM,Nd) Alloy显示文摘The Mg-MM and Mg-Nd master alloys were prepared through the ingot metallurgy method under the protection of a special flux. The thermodynamic behaviors of different rare earth elements in the molten Mg alloys were investigated.Two experimental alloys, Mg-3.0 wt pct MM-0.7 wt pct Zn-0.7 wt pct Zr and Mg-2.8 wt pct Nd-0.7 wt pct Zn0.7 wt pct Zr, were prepared. The hardness and tensile properties of experimental alloys were measured and the microstructures were observed. The results showed that the rare earth elements could react greatly with the Mg chloride in the flux. The Mg-Nd-Zn-Zr alloy displayed a good aging hardening effect. The dispersed metastable phase β' (Mg3Nd) is an important strengthening phase to improve the tensile properties of this alloy. So the Mg-Nd-Zn-Zr alloy has better tensile properties and elongation than those of the Mg-MM-Zn-Zr alloy, and the ductile fracture character could be observed. The microvoid coalescence is the dominant fracture mechanism in this alloy. | Kun YU, Wenxian LI and Songrui LICollege of Materials Science and Engineering, Central South University, Changsha 410083, China | 2002 | Journal of Materials Science & Technology2002，18，4： | 2 |
| 12 | HIGH RESOLUTION RANGE PROFILE FORMATION BASED ON LFM SIGNAL FUSION OF MULTIPLE RADARS显示文摘This paper presents a new method of High Resolution Range (HRR) profile formation based on Linear Frequency Modulation (LFM) signal fusion of multiple radars with multiple frequency bands. The principle of the multiple radars signal fusion improving the range resolution is analyzed. With the analysis of return signals received by two radars,it is derived that the phase difference between the echoes varies almost linearly with respect to the frequency if the distance between two radars is neg-ligible compared with the radar observation distance. To compensate the phase difference,an en-tropy-minimization principle based compensation algorithm is proposed. During the fusion process,the B-splines interpolation method is applied to resample the signals for Fourier transform imaging. The theoretical analysis and simulations results show the proposed method can effectively increase signal bandwidth and provide a high resolution range profile. | Wang Cheng Hu Weidong Du Xiaoyong Yu Wenxian | 2007 | Journal of Electronics(China)2007，24，1： | 2 |
| 13 | Single-cell RNA-sequencing reveals the dynamic process and novel markers in porcine spermatogenesis显示文摘Background:Spermatogenesis is the process by which male gametes are formed from spermatogonial stem cells and it is essential for the reliable transmission of genetic information between generations.To date,the dynamic transcriptional changes of defined populations of male germ cells in pigs have not been reported.Results:To characterize the atlas of porcine spermatogenesis,we profiled the transcriptomes of~16,966 testicular cells from a 150-day-old pig testis through single-cell RNA-sequencing(scRNA-seq).The scRNA-seq analysis identified spermatogonia,spermatocytes,spermatids and three somatic cell types in porcine testes.The functional enrichment analysis demonstrated that these cell types played diverse roles in porcine spermatogenesis.The accuracy of the defined porcine germ cell types was further validated by comparing the data from scRNA-seq with those from bulk RNA-seq.Since we delineated four distinct spermatogonial subsets,we further identified CD99 and PODXL2 as novel cell surface markers for undifferentiated and differentiating spermatogonia,respectively.Conclusions:The present study has for the first time analyzed the transcriptome of male germ cells and somatic cells in porcine testes through scRNA-seq.Four subsets of spermatogonia were identified and two novel cell surface markers were discovered,which would be helpful for studies on spermatogonial differentiation in pigs.The datasets offer valuable information on porcine spermatogenesis,and pave the way for identification of key molecular markers involved in development of male germ cells. | Lingkai Zhang Fuyuan Li Peipei Lei Ming Guo Ruifang Liu Ling Wang Taiyong Yu Yinghua Lv Tao Zhang Wenxian Zeng Hongzhao Lu Yi Zheng | 2022 | Journal of Animal Science and Biotechnology2022，13，2： | 2 |
| 14 | A Novel Ship Detection Approach for Polarimetric SAR Images Based on a Foreground/Background Separation Framework显示文摘 | LIU Bin WANG Huanyu YU Qiuze LIU Xingzhao YU Wenxian | 2013 | Chinese Journal of Electronics2013，22，3： | 2 |
| 15 | Plastic deformation behaviors of a Mg - Ce - Zn - Zr alloy 显示文摘 | YU Kun LI Wenxian ZHAO Jun | 2003 | Script Materialia2003，48，： | 1 |
| 16 | Plastic deformation behaviors of a Mg-Ce-Zn-Zr alloy显示文摘 | Kun Yu Wenxian Li Jun Zhao | 2003 | Scripta Materialia2003，48，： | 1 |
| 17 | Aircraft Detection for HR SAR Images in Non-homogeneous Background Using GGMD-Based Modeling显示文摘In the problem of aircraft detection for High resolution(HR)Synthetic aperture radar(SAR)images,the background areas commonly contain multiple land cover types,such as runways and grassland.The conventional Constant false alarm rate(CFAR)detection in these non-homogeneous backgrounds with homogeneous assumption leads to unreliable detection results.This paper constructs a one-stage detection method based on the Generalized gamma mixture distribution(GGMD),which is regarded as a competitive and applicable model for combining the advantages of the Generalized gamma distribution(GGD)and the Finite mixture model(FMM).In order to evaluate the availability of the proposed algorithm,HR SAR images for aircraft detection from different product types and with various resolutions are examined.Compared with the CFAR algorithms based on the Gamma distribution,the GGD,and the gamma mixture distribution,the proposed algorithm demonstrates its availability and effectiveness for aircraft detection in HR SAR images in non-homogeneous background. | HU Hao HUANG Lanqing YU Wenxian | 2019 | Chinese Journal of Electronics2019，28，6： | 1 |
| 18 | Region-based classification of polarimetric SAR images using Wishart MRF 显示文摘 | Wu Yonghui Ji Kefeng Yu Wenxian | 2008 | IEEE Geoscience and Remote Sensing Letters2008，5，4： | 1 |
| 19 | An intelligence recognition method of ship targets 显示文摘 | Guo Guirong Yu Wenxian Zhang Wei | 1990 | Fuzzy Sets and Systems1990，36，： | 1 |
| 20 | Visual effects based on feature extraction for dynamic radar target echo series 显示文摘 | Zhang Jing Song Rui YU Wenxian | 2004 | ICSP 042004，，： | 1 |
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