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| 1 | Spaceborne GPS receiver antenna phase center offset and variation estimation for the Shiyan 3 satellite显示文摘In determining the orbits of low Earth orbit(LEO) satellites using spaceborne GPS, the errors caused by receiver antenna phase center offset(PCO) and phase center variations(PCVs) are gradually becoming a major limiting factor for continued improvements to accuracy. Shiyan 3, a small satellite mission for space technology experimentation and climate exploration, was developed by China and launched on November 5, 2008. The dual-frequency GPS receiver payload delivers1 Hz data and provides the basis for precise orbit determination within the range of a few centimeters. The antenna PCO and PCV error characteristics and the principles influencing orbit determination are analyzed. The feasibility of PCO and PCV estimation and compensation in different directions is demonstrated through simulation and in-flight tests. The values of receiver antenna PCO and PCVs for Gravity Recovery and Climate Experiment(GRACE) and Shiyan 3 satellites are estimated from one month of data. A large and stable antenna PCO error, reaching up to10.34 cm in the z-direction, is found with the Shiyan 3 satellite. The PCVs on the Shiyan 3 satellite are estimated and reach up to 3.0 cm, which is slightly larger than that of GRACE satellites. Orbit validation clearly improved with independent k-band ranging(KBR) and satellite laser ranging(SLR) measurements. For GRACE satellites, the average root mean square(RMS) of KBR residuals improved from 1.01 cm to 0.88 cm. For the Shiyan 3 satellite, the average RMS of SLR residuals improved from 4.95 cm to 4.06 cm. | Gu Defeng Lai Yuwang Liu Junhong Ju Bing Tu Jia | 2016 | Chinese Journal of Aeronautics2016，29，5： | 11 |
| 2 | Basic performance of BeiDou-2 navigation satellite system used in LEO satellites precise orbit determination显示文摘The visibility for low earth orbit(LEO) satellites provided by the BeiDou-2 system is analyzed and compared with the global positioning system(GPS). In addition, the spaceborne receivers' observations are simulated by the BeiDou satellites broadcast ephemeris and LEO satellites orbits. The precise orbit determination(POD) results show that the along-track component accuracy is much better over the service area than the non-service area, while the accuracy of the other two directions keeps at the same level over different areas. However, the 3-dimensional(3D) accuracy over the two areas shows almost no difference. Only taking into consideration the observation noise and navigation satellite ephemeris errors, the 3D accuracy of the POD is about30 cm. As for the precise relative orbit determination(PROD), the 3D accuracy is much better over the eastern hemisphere than that of the western hemisphere. The baseline length accuracy is 3.4 mm over the service area, and it is still better than 1 cm over the non-service area. This paper demonstrates that the BeiDou regional constellation could provide global service to LEO satellites for the POD and the PROD. Finally, the benefit of geostationary earth orbit(GEO) satellites is illustrated for POD. | Liu Junhong Gu Defeng Ju Bing Yao Jing Duan Xiaojun Yi Dongyun | 2014 | Chinese Journal of Aeronautics2014，27，5： | 9 |
| 3 | Precession–nutation correction for star tracker attitude measurement of STECE satellite显示文摘Space Technology Experiment and Climate Exploration(STECE) is a small satellite mission of China for space technology experiment and climate exploration. A new test star tracker and one ASTRO 10 star tracker have been loaded on the STECE satellite to test the new star tracker's measurement performance. However,there is no autonomous precession–nutation correction function for the test star tracker,which causes an apparent periodic deflection in the inter-boresight angle between the two star trackers with respect to each other of up to ±500 arcsec,so the precession and nutation effect needs to be considered while assessing the test star tracker. This paper researches on the precession–nutation correction for the test star tracker's attitude measurement and presents a precession–nutation correction method based on attitude quaternion data. The periodic deflection of the inter-boresight angle between the two star trackers has been greatly eliminated after the precession and nutation of the test star tracker's attitude data have been corrected by the proposed method and the validity of the proposed algorithm has been demonstrated. The in-flight accuracy of the test star tracker has been assessed like attitude noise and low-frequency errors after the precession–nutation correction. | Lai Yuwang Liu Junhong Ding Yonghe Gu Defeng Yi Dongyun | 2014 | Chinese Journal of Aeronautics2014，27，1： | 7 |
| 4 | Atomic Fe-Zn dual-metal sites for high-efficiency pH-universal oxygen reduction catalysis显示文摘An effective electrocatalyst being highly active in all pH range for oxygen reduction reaction(ORR)is crucial for energy conversion and storage devices.However,most of the high-efficiency ORR catalysis was reported in alkaline conditions.Herein,we demonstrated the preparation of atomically dispersed Fe-Zn pairs anchored on porous N-doped carbon frameworks(Fe-Zn-SA/NC),which works efficiently as ORR catalyst in the whole pH range.It achieves high half-wave potentials of 0.78,0.85 and 0.72 V in 0.1 M HClO4,0.1 M KOH and 0.1 M phosphate buffer saline(PBS)solutions,respectively,as well as respectable stability.The performances are even comparable to Pt/C.Furthermore,when assembled into a Zn-air battery,the high power density of 167.2 mWcm−2 and 120 h durability reveal the feasibility of Fe-Zn-SA/NC in real energy-related devices.Theoretical calculations demonstrate that the superior catalytic activity of Fe-Zn-SA/NC can be contributed to the lower energy barriers of ORR at the Fe-Zn-N6 centers.This work demonstrates the potential of Fe-Zn pairs as alternatives to the Pt catalysts for efficient catalytic ORR and provides new insights of dual-atom catalysts for other energy conversion related catalytic reactions. | Jie Xu Shuhua Lai Defeng Qi Min Hu Xianyun Peng Yifan Liu Wei Liu Guangzhi Hu Heng Xu Fan Li Chao Li Jia He Longchao Zhuo Jiaqiang Sun Yuan Qiu Shusheng Zhang Jun Luo Xijun Liu | 2021 | Nano Research2021，14，5： | 6 |
| 5 | A preliminary analysis of the surface chemistry of atmospheric aerosol particles in a typical urban area of Beijing显示文摘Atmospheric aerosol particle samples were collected using an Ambient Eight Stage(Non-Viable) Cascade Impactor Sampler in a typical urban area of Beijing from 27 th Sep.to 5th Oct.,2009.The surface chemistry of these aerosol particles was analyzed using Static Time of Flight-Secondary Ion Mass Spectrometry(Static TOF-SIMS).The factors influencing surface compositions were evaluated in conjunction with the air pollution levels,meteorological factors,and air mass transport for the sampling period.The results show that a variety of organic ion groups and inorganic ions/ion groups were accumulated on the surfaces of aerosol particles in urban areas of Beijing;and hydrophobic organic compounds with short-or middle-chain alkyl as well as hydrophilic secondary inorganic compounds were observed.All these compounds have the potential to affect the atmospheric behavior of urban aerosol particles.PM1.1–2.1and PM3.3–4.7had similar elements on their surfaces,but some molecules and ionic groups demonstrated differences in Time of Flight-Secondary Ion Mass Spectrometry spectra.This suggests that the quantities of elements varied between PM1.1–2.1and PM3.3–4.7.In particular,more intense research efforts into fluoride pollution are required,because the fluorides on aerosol surfaces have the potential to harm human health.The levels of air pollution had the most significant influence on the surface compositions of aerosol particles in our study.Hence,heavier air pollution was associated with more complex surface compositions on aerosol particles.In addition,wind,rainfall,and air masses from the south also greatly influenced the surface compositions of these urban aerosol particles. | Zhengzheng Zhang Hong Li Hongyan Liu Runxiang Ni Jinjuan Li Liqun Deng Defeng Lu Xueli Cheng Pengli Duan Wenjun Li | 2016 | Journal of Environmental Sciences2016，28，9： | 5 |
| 6 | Raman micro-spectrometry as a technique for investigating heterogeneous reactions on individual atmospheric particles显示文摘Investigating the heterogeneous reaction on individual atmospheric particles is important because it approximates actual atmospheric conditions and can aid in reducing artifacts in elucidating real mechanisms and processes,and determining real kinetic parameters of the atmosphere relevance.This study developed a Raman microspectrometry method to investigate heterogeneous reactions on individual particles.The method was applied to the reaction of NO2 with individual CaCO3 particles.It was demonstrated that Raman microspectrometry can obtain information on both chemical composition and microscopic morphology at the same time,as well as information on chemical characteristics,such as the phase,which is useful for studying reaction processes.Raman spectra of individual particles deposited on a substrate showed no interference by morphological resonance,which is helpful for obtaining high-quality spectra.Moreover,Raman microspectrometry was compared with other methods for investigating heterogeneous reactions on individual particles and was found to have several advantageous characteristics. | ZHAO DeFeng,ZHU Tong,CHEN Qi,LIU YingJun & ZHANG ZeFeng State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China | 2011 | Science China Chemistry2011，54，1： | 5 |
| 7 | Finite element modelling on microstructure evolution during multi-pass hot compression for AZ31 alloys using incremental method显示文摘Based on the principle of piecewise linearization, the incremental forms of microstructure evolution models were integrated into the thermo-mechanical coupled finite element(FE) model to simulate nonlinear microstructure evolution during multi-pass hot deformation. This is an unsteady-state deformation where dynamic recrystallization(DRX), meta-dynamic recrystallization(MDRX), static recrystallization(SRX) and grain growth(GG) take place during hot deformation or deformation interval. The distributions of deformation and microstructure for cylindrical AZ31 sample during single-pass and double-pass hot compressions were quantitatively calculated and compared with the metallographic observation. It is shown that both the deformation and microstructure are non-uniformly distributed due to the presence of friction between the die and the flat end of sample. The average grain size and its standard deviation under the double-pass hot compression are slightly smaller than those under single-pass compression.The simulated average grain sizes agree well with the experiments, which validates that the developed FE model on the basis of incremental forms of microstructure evolution models is reasonable. | Zhaoyang Jin Kai Yin Kai Yan Defeng Wu Juan Liu Zhenshan Cui | 2017 | Journal of Materials Science & Technology2017，33，11： | 3 |
| 8 | High-efficiency electrocatalytic NO reduction to NH_(3) by nanoporous VN显示文摘Electrocatalytic NO reduction reaction to generate NH_(3)under ambient conditions offers an attractive alternative to the energy-extensive Haber-Bosch route;however,the challenge still lies in the development of cost-effective and high-performance electrocatalysts.Herein,nanoporous VN film is first designed as a highly selective and stable electrocatalyst for catalyzing reduction of NO to NH_(3)with a maximal Faradaic efficiency of 85%and a peak yield rate of 1.05×10^(-7)mol·cm^(-2)·s^(-1)(corresponding to 5,140.8mg·h^(-1)·mg_(cat).^(-1))at-0.6 V vs.reversible hydrogen electrode in acid medium.Meanwhile,this catalyst maintains an excellent activity with negligible current density and NH_(3)yield rate decays over 40 h.Moreover,as a proof-of-concept of Zn-NO battery,it delivers a high power density of 2.0 mW·cm^(-2)and a large NH_(3)yield rate of 0.22×10^(-7)mol·cm^(-2)·s^(-1)(corresponding to 1,077.1mg·h^(-1)·mg_(cat).^(-1)),both of which are comparable to the best-reported results.Theoretical analyses confirm that the VN surface favors the activation and hydrogenation of NO by suppressing the hydrogen evolution.This work highlights that the electrochemical NO reduction is an eco-friendly and energy-efficient strategy to produce NH_(3). | Defeng Qi Fang Lv Tianran Wei Mengmeng Jin Ge Meng Shusheng Zhang Qian Liu Wenxian Liu Dui Ma Mohamed SHamdy Jun Luo Xijun Liu | 2022 | Nano Research Energy2022，1，2： | 2 |
| 9 | Heterogeneous reaction of NO_2 on the surface of montmorillonite particles显示文摘The studies on heterogeneous reactions over montmorillonite,which is a typical 2:1 layered aluminosilicate,will benefit to the understanding of heterogeneous reactions on clay minerals.Montmorillonite can be classified as sodium montmorillonite or calcium montmorillonite depending on the cation presented between the different layers.Using diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS),the heterogeneous reaction mechanism of NO2 on the surface of montmorillonite was firstly investigated.Results showed that the reaction of NO2 on the surface of sodium and calcium montmorillonite fit a first-order kinetics,and the reaction duration of calcium montmorillonite was longer than that of sodium montmorillonite under the dry condition.For either sodium or calcium montmorillonite,the uptake coefficient decreased as humidity increased. | Zefeng Zhang Jing Shang Tong Zhu Hongjun Li Defeng Zhao Yingju Liu Chunxiang Ye | 2012 | Journal of Environmental Sciences2012，24，10： | 2 |
| 10 | Electricity generation from food wastes and microbial community structure in microbial fuel cells显示文摘 | Jianna Jia Yu Tang Bingfeng Liu Di Wu Nanqi Ren Defeng Xing | 2013 | Bioresource Technology2013，，： | 1 |
| 11 | Synthesis and antimicrobial use of cationic monoazo dyes incorporating quaternary ammonium salts显示文摘 | Ma Jiang Zhao Defeng | 2007 | Dyes and Pigments2007，75，2： | 1 |
| 12 | Fabrication of large-area uniform carbon nanotube foams as near-critical-density targets for laser–plasma experiments显示文摘Carbon nanotube foams(CNFs)have been successfully used as near-critical-density targets in the laser-driven acceleration of high-energy ions and electrons.Here we report the recent advances in the fabrication technique of such targets.With the further developed floating catalyst chemical vapor deposition(FCCVD)method,large-area(>25 cm^(2))and highly uniform CNFs are successfully deposited on nanometer-thin metal or plastic foils as double-layer targets.The density and thickness of the CNF can be controlled in the range of 1−13 mg/cm^(3)and 10−200µm,respectively,by varying the synthesis parameters.The dependence of the target properties on the synthesis parameters and the details of the target characterization methods are presented for the first time. | Pengjie Wang Guijun Qi Zhuo Pan Defeng Kong Yinren Shou Jianbo Liu Zhengxuan Cao Zhusong Mei Shirui Xu Zhipeng Liu Shiyou Chen Ying Gao Jiarui Zhao Wenjun Ma | 2021 | High Power Laser Science and Engineering2021，9，2： | 1 |
| 13 | An NF-[kappa]B pathway-mediated positive feedback loop amplifies Ras activity to pathological levels in mice显示文摘 | Daniluk Jaroslaw Liu Yan Deng Defeng Chu Jun Huang Haojie Gaiser Sebastian Cruz-Monserrate Zobeida Wang Huamin Ji Baoan Logsdon Craig D | 2012 | EN2012，，4： | 1 |
| 14 | The kinetic characterization of photofermentative bacterium Rhodopseudomonas faecalis RLD- 53 and its application for enhancing continuous hydrogen pmduciion 显示文摘 | Xie Guojun Liu Bingfeng Xing Defeng | 2012 | International Journal of Hydrogen Energy2012，37，13： | 1 |
| 15 | Provenance System Analysis of the Nantun Formation of the Huhehu Sag in Hailar Basin显示文摘Huhehu Sag is a new battlefield for the future oil and gas exploration in the Hailar Basin.At present,exploration of this area stays at a low level and the understanding of the provenance system of the Nantun Formation is comparatively weak.So,to carry out the detailed depiction of the provenance system in the study area is significant for the sedimentary system reconstruction,for the prediction of reservoir distribution and favorable areas.Based on comprehensive analysis of paleogeomorphy,light-heavy mineral and seismic reflection features,sandstone thickness and sandstone percentage,this paper analyzes in detail the provenance system of the Nantun Formation in Huhehu Sag from various angles and levels.It shows that provenances of the Huhehu Sag mainly originated from the eastern Xilinbeier Salient and western Bayan Mountain Uplift.The provenances surrounding the lake basin converged to the center of the basin,among which,the steep slope belt and the gentle slope belt are the main provenances,and the southern uplift is a secondary one.The distribution framework of the provenance fundamentally determines the distribution rules of the depositional system and its sand body developing during the Nantun period. | LI Junhui MENG Qi'an LU Shuangfang ZHU Defeng WU Haibo LIU He ZHANG Dazhi | 2012 | Acta Geologica Sinica(English Edition)2012，86，1： | 1 |
| 16 | Enhanced hydrogen production from waste activated sludge by cascade utilization of organic matter in microbial显示文摘 | LU Lu XING Defeng LIU Bingfeng | 2012 | Water Research2012，46，4： | 1 |
| 17 | The kinetic characterization of photoermentative bacterium Rhodopseudomonas faecalis RLD-53 and its application for enhancing continuous hydrogen production显示文摘 | Xie Guojun Liu Bingfeng Xing Defeng | 2012 | International Journal of Hydrogen Energy2012，37，18： | 1 |
| 18 | Ferric iron enhances electricity generation by Shewanella oneidensis MR-1 in MFCs显示文摘 | Di Wu Defeng Xing Lu Lu Ma Wei Bingfeng Liu Nanqi Ren | 2012 | Bioresource Technology2012，，： | 1 |
| 19 | The kinetic characterization of photofermentative bacterium Rhodopseudomonas faecalis RLD -53 and its application for enhancing continuous hy-drogen production 显示文摘 | XIE Guojun LIU Bingfeng XING Defeng | 2012 | International Journal of Hydrogen Energy2012，，37： | 1 |
| 20 | Inhibitory activity of a novel antibacterial peptide AMPNT-6 from Bacillus subtilis against Vibrio parahaemolyticus in shrimp显示文摘 | Defeng Xu Yaling Wang Lijun Sun Huanming Liu Jianrong Li | 2013 | Food Control2013，，1： | 1 |
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