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| 1 | Joint calibration algorithm for gain-phase and mutual coupling errors in uniform linear array显示文摘The effect of gain-phase perturbations and mutual coupling significantly degrades the performance of digital array radar(DAR). This paper investigates array calibration problems in the scenario where the true locations of auxiliary sources deviate from nominal values but the angle intervals are known. A practical algorithm is proposed to jointly calibrate gain-phase errors and mutual coupling errors. Firstly, a simplified model of the distortion matrix is developed based on its special structure in uniform linear array(ULA). Then the model is employed to derive the precise locations of the auxiliary sources by one-dimension search. Finally, the least-squares estimation of the distortion matrix is obtained. The algorithm has the potential of achieving considerable improvement in calibration accuracy due to the reduction of unknown parameters. In addition,the algorithm is feasible for practical applications, since it requires only one auxiliary source with the help of rotation platforms. Simulation results demonstrate the validity, robustness and high performance of the proposed algorithm. Experiments were carried out using an S-band DAR test-bed.The results of measured data show that the proposed algorithm is practical and effective in application. | Li Weixing Lin Jianzhi Zhang Yue Chen Zengping | 2016 | Chinese Journal of Aeronautics2016，29，4： | 9 |
| 2 | Coordinated Modulation Strategy Considering Multi-HVDC Emergency for Enhancing Transient Stability of Hybrid AC/DC Power Systems显示文摘This paper presents a multi-HVDC emergency coordinated modulating strategy to enhance the transient stability of hybrid AC/DC power systems.First,the main factors that affect the unbalanced energy distribution during a fault are analyzed,and the dominant generators are determined online.Next,considering the influence on both generators in the sending and receiving ends,the assessment index that evaluates the effects of DC power support is established.On the basis of this,a dynamic DC power support strategy is put forward,and the DC support sequence table is promptly updated by the changing dominant generators.The AC/DC hybrid power system with multi-DC lines is built and used as a test system.The simulation results of different scenarios demonstrate that the proposed method could follow the dominant generator dynamically and adjust the DC participating in modulation to enhance the transient stability effectively and quickly. | Tong Wang Congcong Li Dengkai Mi Zengping Wang Yuwei Xiang | 2020 | CSEE Journal of Power and Energy Systems2020，6，4： | 4 |
| 3 | Fuzzy linear discriminant analysis for chemical data sets显示文摘 | Chen Zengping Jiang Jianhui Li Yang | 1999 | Chemometrics and Intel- ligent Laboratory Systems1999，45，12： | 1 |
| 4 | Geochemistry and environmental effect of cadmium in the super-large Jinding Pb-Zn deposit,Yunnan Province, China显示文摘The Jinding Pb-Zn deposit in Yunnan Province is the representative of a Cd-enriched area and mining activities lead to the release of Cd into the hypergenic ecosystem, resulting in Cd pollution. The concentrations of Cd vary greatly from one type to another type of rocks in the mining district. In the host rock, Cd concentrations range from 50×10-6 to 650×10-6 with an average of 310×10-6. In primary ores, Cd concentrations range from 14×10-6 to 2800×10-6 with an average of 767×10-6. However, in oxidized ores, Cd concentrations are highest, varying within the range of 110×10-6 to 8200×10-6 , averaging 1661×10-6. It is shown that the oxidized ores are the main carrier and environmental source of Cd. Leaching test showed that Pb/Zn ores are easy to oxidize and thereafter release Cd and other harmful elements. These leached elements in the leachate may be precipitated rapidly in the order of Zn>Pb>Cd. As for the concentration distribution of Cd in the Bijiang River, it is estimated to be 15.7 μg/L Cd in water, 49.3 mg/L in suspended substances, and 203.7 mg/L in sediments. The average value of Cd in soil from the polluted area is 83.0 mg/kg. Natural weathering of Cd-rich rocks and minerals imposes a potential environmental risk on the aquatic ecosystem of the Bijiang catchment. | LI Hang LI Dahua XIAO Tangfu HE Libin NING Zengping SUN Jialong ZHU Changsheng SHUANG Yan | 2008 | Chinese Journal Of Geochemistry2008，27，1： | 1 |
| 5 | Giant magnetoelectric effect in Pb(Zr,Ti)O-bimorph/NdFeB laminate device 显示文摘 | XING Zengping LI Jiefang VIEHLAND D | 2008 | Appl Phys Lett2008，93，1： | 1 |
| 6 | Characteristics of bridge damages in Wenchuan earthquake 显示文摘 | Li Hongjing Lu Ming Wen Zengping | 2009 | Journal of Nanjing University of Technology (Natural Science Edi- tion)2009，31，1： | 1 |
| 7 | Fuzzy linear cliscriminant analysis for chemical data sets 显示文摘 | CHEN Zengping JIANG Jianhui LI Yizeng | 1999 | Chemometrics and Intelligent Laboratory Systems1999，45，12： | 1 |
| 8 | Research on Optimization of Recloser Placement of DG-enhanced Distribution Networks显示文摘 | ZHANG Li XU Yuqin WANG Zengping | | 0，，0885： | 1 |
| 9 | The effect of clinical-grade retinal pigment epithelium derived from human embryonic stem cells using different transplantation strategies显示文摘Dear Editor, Many forms of sight-threatening diseases, including retinitis pigmentosa (RP) and age-related macular degeneration (AMD), are caused by the dysfunction, degeneration and loss of the retinal pigment epithelium (RPE)(Strauss, 2005). RPE cell transplantation may potentially recover or halt disease progression, in which human embryonic stem cells (hESCs) could serve as an unlimited donor source for RPE differentiation, and a few clinical trials have shown the safety and effective of transplantation of hESCs-derived RPE (hESC-RPE) for AMD patients (Schwartz et al., 2012;Schwartz etal., 2015;Song etal., 2015;da Cruz et al., 2018;Kashani et al., 2018;Liu et al., 2018). | Lei Wang Wei Wu Qi Gu Zengping Liu Qiyou Li Zhongwen Li Jinhui Fang Wenjing Liu Jun Wu Ying Zhang Liu Wang Haiwei Xu Wei Li Baoyang Hu Qi Zhou Zhengqin Yin Jie Hao | 2019 | Protein & Cell2019，10，6： | 1 |
| 10 | Species Diversity of Arbuscular Mycorrhizal Fungi in the Rhizosphere of Hevea brasiliensis in Hainan Island,China显示文摘Hevea brasiliensis is one of the important economic trees with a great economic value for natural rubber production.Symbiosis between roots of H.brasiliensis and arbuscular mycorrhizal fungi(AMF)is widely recognized,and can provide a range of benefits for both of them.Hainan Island harbors is one of the largest plantations of H.brasiliensis in China,whereas the information regarding the diversity of AMF in the rhizosphere of H.brasiliensis on this island is scarce.The diversity of AMF species in the rhizosphere of rubber tree plantations in Hainan was investigated in this study.A total of 72 soil samples from the rhizosphere of H.brasiliensis RY7-33-97 were collected.These included 48 samples from plantations in 11 cities or counties that had been planted for 15–25 years,and 24 samples from a demonstrating plantation site of the China National Rubber Tree Germplasm Repository representing plantations with tree plantation ages from one to 40 year-old.Collectively,a total of 68 morphotypes of AMF,belonging to the genera of Archaeospora(1),Glomus(43),Acaulospora(18),Entrophospora(3),Scutellospora(2),and Gigaspora(1)were isolated and identified,as per morphological characteristics of spores presented in the collected soil samples.Glomus(Frequency,F=100%)and Acaulospora(F=100%)were the predominant genera,and A.mellea(F=63.9%)and A.scrobiculata(F=63.9%)were the predominant species.AMF species differed significantly among collected sites in spore density(SD,290.7–2,186.7 spores per 100 g dry soil),species richness(SR,4.3–12.3),and Shannon-Weiner index of diversity(H,1.24–2.24).SD was negatively correlated with available phosphorus level in the soil;SR was positively correlated with soil total phosphorus content;and H was positively correlated with levels of soil organic matter and total phosphorus.Similarly,SD,SR,and H were also correlated with H.brasiliensis plantation age,and an increasing trend was observed up to 40 years.These results suggest that the AMF community was complex and ubiquitous in the island plantation ecosystems of H.brasiliensis,with high species abundance and diversity.Soil factors and plantation age dramatically affected AMF diversity at species level. | Xiubing Gao Jiejie Lv Can Guo Anlong Hu Xiaomao Wu Zengping Li | 2021 | Phyton-International Journal of Experimental Botany2021，90，1： | 1 |
| 11 | High resolution miniaturized stepper ultrasonic motor using differential composite motion显示文摘 | Chu Xiangcheng Xing Zengping Li Longtu | 2004 | Ultrasonics2004，41，9： | 1 |
| 12 | Non-linear Mapping Using Real-valued Genetic Algorithm显示文摘 | CHEN Zengping JIANG Jianhui LI Yang | 1999 | Chemometrics and Intelligent Laboratory Systems1999，45，12： | 1 |
| 13 | Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs显示文摘Arbitrary polarized vortex beam induced by polarization singularity offers a new platform for both classical optics and quantum entanglement applications.Bound states in the continuum(BICs)have been demonstrated to be associated with topological charge and vortex polarization singularities in momentum space.For conventional symmetric photonic crystal slabs(PhCSs),BIC is enclosed by linearly polarized far fields with winding angle of 2π,which is unfavorable for high-capacity and multi-functionality integration-optics applications.Here,we show that by breakingσz-symmetry of the PhCS,asymmetry in upward and downward directions and arbitrarily polarized BIC can be realized with a bilayer-twisted PhCS.It exhibits elliptical polarization states with constant ellipticity angle at every point in momentum space within the vicinity of BIC.The topological nature of BIC reflects on the orientation angle of polarization state,with a topological charge of 1 for any value of ellipticity angle.Full coverage of Poincarésphere(i.e.,-π/4≤X≤4 and-π/2≤ψ≤π/2)and higher-order Poincarésphere can be realized by tailoring the twist angles.Our findings may open up new avenues for applications in structured light,quantum optics,and twistronics for photons. | Haoye Qin Zengping Su Mengqi Liu Yixuan Zeng Man-Chung Tang Mengyao Li Yuzhi Shi Wei Huang Cheng-Wei Qiu Qinghua Song | 2023 | Light(Science & Applications)2023，12，4： | 0 |
| 14 | Bioavailability of Tl in soils, uptake by crops and its environmental impact显示文摘 | Libin HE Tangfu XIAO Hang LI Jingquan PENG Zengping NING Jialong SUN Fei YANG | 2006 | Chinese Journal Of Geochemistry2006，25，B08： | 0 |
| 15 | Pulse-like ground motion observed during the 6 February 2023 M_(W)7.8 Pazarcık Earthquake(Kahramanmaraş,SE Türkiye)显示文摘In this study,we analyzed 100 three-component strong ground motion records observed within 200 km of the causative fault of the 6 February 2023 M_(W)7.8 Pazarcık(Kahramanmaraş)Earthquake in SE Türkiye.The wavelet method was utilized to identify and analyze the characteristics of pulse-like ground motions in the near-fault region,while considering the uncertainty of the pulse orientation during the analysis.Our investigation focused on the effects of the focal mechanism and rupture process on the spatial distribution,pulse orientation,and maximum pulse direction of the observed pulse-like ground motion.We also analyzed the amplitude and period of the observed ground pulses and the effect of long-period amplification on the ground motion response spectra.Our results indicated the following:(1)A total of 21 typical ground velocity pulses were observed during this earthquake,exhibiting complex characteristics due to the influence of the strike-slip mechanism and rupture directivity.Most ground pulses(17 out of 21)were recorded within 20 km of the fault,in a wide range of orientations,including normal and parallel to the fault direction.The waveforms exhibited unidirectional features,indicating the effects of left-lateral fault slip.Distinct pulses observed more than 20 km from the fault were mainly oriented normal to the fault.The waveforms were bidirectional with double-or multi-round trips as a result of rupture directivity.(2)The amplitudes of the observed pulses ranged from 30.5 to 220.0 cm/s,with the largest peak velocity of 220.0 cm/s observed at Station 3138.The pulse periods ranged from 2.3 to 14.5 s,with the longest pulse period of 14.5 s observed at Station 3116.The amplitude and period of the pulses observed during this earthquake were comparable to those of similar-magnitude global earthquakes.The amplitude of the pulses decreased significantly with increasing fault distance,whereas the pulse period was not significantly affected by the fault distance.(3)Compared with non-pulse records,the velocity pulse records had a pronounced amplification effect on the acceleration response spectra near the pulse period,with factors ranging from 2.1 to 5.8.The larger velocity pulses also significantly amplified the velocity response spectra,particularly over the long periods.This significant amplification effect of the pulses on the response spectra leads to empirical models underestimating the long-period earthquake ground motion. | Fan Wu Junju Xie Zhao An Chenghao Lyu Tuncay Taymaz Tahir Serkan Irmak Xiaojun Li Zengping Wen Baofeng Zhou | 2023 | Earthquake Science2023，36，4： | 0 |
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