|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | The Chinese carbon cycle data-assimilation system(Tan-Tracker)显示文摘In this study,the Chinese carbon cyle dataassimilation system Tan-Tracker is developed based on the atmospheric chemical transport model(GEOS-Chem)platform.Tan-Tracker is a dual-pass data-assimilation system in which both CO2concentrations and CO2fluxes are simultaneously assimilated from atmospheric observations.It has several advantages,including its advanced data-assimilation method,its highly efficient computing performance,and its simultaneous assimilation of CO2concentrations and CO2fluxes.Preliminary observing system simulation experiments demonstrate its robust performance with high assimilation precision,making full use of observations.The Tan-Tracker system can only assimilate in situ observations for the moment.In the future,we hope to extend Tan-Tracker with functions for using satellite measurements,which will form the quasioperational Chinese carbon cycle data-assimilation system. | Xiangjun Tian Zhenghui Xie Zhaonan Cai Yi Liu Yu Fu Huifang Zhang | 2014 | Chinese Science Bulletin2014，59，14： | 7 |
| 2 | Sediment delivery ratio and its uncertainties on flood event scale:Quantification for the Lower Yellow River显示文摘Sediment delivery ratio(SDR)for fluvial rivers was formulated with sediment rating curve.The observed data of SDR on flood event scale of the Lower Yellow River(LYR)were adopted to examine the formulation and to calibrate the model parameters.A regression formula of SDR was then established and its 95%prediction interval was accordingly quantified to represent its overall uncertainties.Three types of factors including diversity of the incoming flow conditions,river self-regulation processes,and human activities were ascribed to the uncertainties.The following were shown:(1)With the incoming sediment coefficient(ISC)being a variable,it was not necessary to adopt the incoming flow discharge as the second variable in the formulation of SDR;and(2)ISC=0.003 and therefore SDR=2 might be a threshold for distinguishing the characteristics of sediment transport within the LYR.These findings would highlight sediment transport characteristics on the scale of flood event and contribute to uncertainty based analysis of water volume required for sediment transport and channel maintenance of the LYR. | FU XuDong 1,JIANG LiWei 1,WU BaoSheng 1,HU ChunHong 2,WANG GuangQian 1 &FEI XiangJun 1 1State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China 2China Institute of Hydropower and Water Resources Research,Beijing 100044,China | 2010 | Science China(Technological Sciences)2010，53，3： | 7 |
| 3 | Experimental and DFT study on cerium inclusions in clean steels显示文摘To provide insights into deforming Ce-O-S-Al inclusions in steels and improving the mechanical properties,the evolution process of such harmful inclusions in clean steels was investigated by thermodynamic calculation,metallographic examination and first-principles calculation in this paper.For the tested IF steel,the thermodynamic analysis results are consistent with the calculated formation enthalpy.After Ce addition,the inclusions are transformed from Al_(2)O_(3)and TiN-Al_(2)TiO_(5)-Al_(2)O_(3)to Ce2O_(3),Ce_(2)O_(2)S,CeAlO_(3),TiN-Al_(2)TiO_(5)-Ce_(2)O_(3)and TiN-Al_(2)TiO_(5)-Ce_(2)O_(2)S composite inclusions,which can be confirmed by metallographic examination.The elastic constants were calculated,and the bulk modulus,Young's modulus,shear modulus and Poisson's ratio were evaluated by the Voigt-Reuss-Hill(VRH)approximation.All inclusions except Ce_(2)O_(3)show apparent brittleness.TiN,Al_(2)O_(3),Al_(2)TiO_(5)and CeAlO_(3)present much higher hardness than iron matrix,while the hardness of Ce2O_(3)or Ce_(2)O_(2)S is close to that of iron matrix.The thermal expansion coefficients of Ce_(2)O_(3)and CeAlO_(3)are close to that of iron matrix,whereas,Ce_(2)O_(2)S inclusion has largely different thermal expansion coefficient from iron matrix and may deteriorate the steel performance at higher temperatures.The relatively small differences between Ce inclusions and iron matrix in terms of hardness,toughness,brittleness,and thermal expansion coefficient can explain the improvement of the mechanical properties of the tested steel. | Xiangjun Liu Jichun Yang Fang Zhang Xiaoyang Fu Hongwei Li Changqiao Yang | 2021 | Journal of Rare Earths2021，39，4： | 6 |
| 4 | Planar Velocity Distribution of Viscous Debris Flow at Jiangjia Ravine,Yunnan,China:A Field Measurement Using Two Radar Velocimeters显示文摘Characteristics of planar velocity distribution of vis-cous debris flow were analyzed using the measured data at Jiangjia Ravine,Yunnan,China. The velocity data were measured through using two radar velocimeters. The cross-sectional mean velocities were calculated and used to examine Kang et al's(2004) relation-ship,which was established for converting the flow velocity at river centerline measured by a radar velocimeter into the mean velocity based on the stop-watch method. The velocity coefficient,K,defined by the ratio of the mean velocity to the maximum ve-locity,ranges from 0.2 to 0.6. Kang et al's(2004) relationship was found being inapplicable to flows with K smaller than 0.43. This paper contributes to show the complexity of the planar velocity distribution of viscous debris flows and the applicability of Kang et al's relationship. | FU Xudong WANG Guangqian KANG Zhicheng FEI Xiangjun | 2007 | Wuhan University Journal of Natural Sciences2007，12，4： | 5 |
| 5 | Frontier research of ultra-high-speed ultra-large-capacity and ultra-long-haul optical transmission显示文摘极端高速度, ultra-large-capacity 和 ultra-long-haul (3U ) 是光通讯的永久追求。作为光通讯的一个新模式, 3U 传播能极大地支持下一代光因特网和宽带活动通讯网络开发和工艺的进步,因此,它变得国际高技术知识产权竞争的焦点扎根。这篇论文在 3U 传播研究引入科学问题,关键技术和重要成就。 | Daojun XUE Shaohua YU Qi YANG Nan CHI Lan RAO Xiangjun XIN Wei LI Songnian FU Sheng CUI Demin LIU Zhuo LI Aijun WEN Chongxiu YU Xinmei WANG | 2016 | Frontiers of Optoelectronics2016，9，2： | 2 |
| 6 | KOH-assisted aqueous synthesis of bimetallic metal-organic frameworks and their derived selenide composites for efficient lithium storage显示文摘To solve low efficiency,environmental pollution,and toxicity for synthesizing zeolitic imidazolate frameworks(ZIFs)in organic solvents,a KOH-assisted aqueous strategy is proposed to synthesize bimetallic ZIFs polyhedrons,which are used as precursors to prepare bimetallic selenide and N-doped carbon(NC)composites.Among them,Fe–Co–Se/NC retains the three-dimensional(3D)polyhedrons with mesoporous structure,and Fe–Co–Se nanoparticles are uniform in size and evenly distributed.When assessed as anode material for lithium-ion batteries,Fe–Co–Se/NC achieves an excellent initial specific capacity of 1165.9 m Ah·g^(-1)at 1.0 A·g^(-1),and the reversible capacity of Fe–Co–Se/NC anode is 1247.4 m Ah·g^(-1)after 550 cycles.It is attributed to that the uniform composite of bimetallic selenides and N-doped carbon can effectively tune redox active sites,the stable 3D structure of Fe–Co–Se/NCs guarantees the structural stability and wettability of the electrolyte,and the uniform distribution of Fe–Co–S nanoparticles in size esuppresses the volume expansion and accelerates the electrochemical reaction kinetics. | Shuya Zhang Yanchun Xue Yutang Zhang Chengxing Zhu Xingmei Guo Fu Cao Xiangjun Zheng Qinghong Kong Junhao Zhang Tongxiang Fan | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，4： | 2 |
| 7 | Navigation jamming signal recognition based on long short-term memory neural networks显示文摘This paper introduces the time-frequency analyzed long short-term memory(TF-LSTM) neural network method for jamming signal recognition over the Global Navigation Satellite System(GNSS) receiver. The method introduces the long shortterm memory(LSTM) neural network into the recognition algorithm and combines the time-frequency(TF) analysis for signal preprocessing. Five kinds of navigation jamming signals including white Gaussian noise(WGN), pulse jamming, sweep jamming, audio jamming, and spread spectrum jamming are used as input for training and recognition. Since the signal parameters and quantity are unknown in the actual scenario, this work builds a data set containing multiple kinds and parameters jamming to train the TF-LSTM. The performance of this method is evaluated by simulations and experiments. The method has higher recognition accuracy and better robustness than the existing methods, such as LSTM and the convolutional neural network(CNN). | FU Dong LI Xiangjun MOU Weihua MA Ming OU Gang | 2022 | Journal of Systems Engineering and Electronics2022，33，4： | 1 |
| 8 | Double cropping wheat and corn in a sub-humid region of China显示文摘 | Zhu Zixi Stewart B A Fu Xiangjun | 1994 | Field Crops Res1994，36，： | 1 |
| 9 | Performance Analysis of Optical Transmission Based on Seven Cores Fiber显示文摘This essay designed a kind of new seven-core fiber with lower crosstalk and loss,and made space division multiplexing transmission experiment based on this seven-core fiber.It is known that crosstalk has the most serious influence in multicore fiber transmission process.Before the experiment,the affecting factors of fiber crosstalk were analyzed through simulation,such as core space,bending radius,and fiber length.Combined with the simulation analysis,the design scheme of multicore fiber with low crosstalk was obtained.Before the fiber design,various factors of influence crosstalk such as the coreto-core distance,bending radius,fiber length and so on.Based on the simulation analysis,conclusion has made on the design scheme of multi-core optimal fiber with low crosstalk.The space division multiplexing and wavelength division multiplexing technology,was adopted to conduct seven-core optical fiber transmission of 58.7km.The crosstalk of adjacent core was suppressed to as low as 45 d B/km,the attenuation of inner core was 0.24 d B/km,the outer cores' 0.32 d B/km.Different bit error rate(BER) performances were also studied under different conditions,through reasonably designing the system to reduce the error rate,improve the performance of the system,and realize long distance and large capacity transmission with fiber. | Hang Zhou Fu Wang Borui Li Ming Tang Xiangjun Xin | 2016 | China Communications2016，13，9： | 1 |
| 10 | Preparation of Lead-free Base Glaze Suitable for Pearlescent Pigments by Low-temperature Solid-phase Reaction with Alkali Waste显示文摘A lead-free base glaze suitable for pearlescent pigments was prepared by a low-temperature solid-phase reaction with alkali waste.Tests were performed to evaluate the effects of the sintering conditions and alkali waste composition on the prepared base glaze and pearlescent glaze.The experimental results show that partially replacing SiO_(2) with B_(2)O_(3) effectively reduced the sintering temperature and time to form a glass network,but the network structure becomes disconnected as the B_(2)O_(3) content increases.An amorphous base glaze was obtained when soda ash was replaced with a small amount of alkali waste,but increasing the addition of NaCl further was adverse to base glaze formation by resulting in crystallization of the base glaze and a decrease in the bridging oxygen content.The pearlescent pigment was thermally stable in the glaze at 750℃,while higher temperatures caused the crystalline phase of NaAlSiO_(4) to appear and adhere to the surface of pigment granules,which degraded the pearlescent effect of the glaze. | 饶黎 HUANG Kang FU Qiong WANG Junwei DAI Li ZHAO Na LI Xiangjun HE Yong ZHOU Yi 陈艳林 | 2022 | Journal of Wuhan University of Technology(Materials Science)2022，37，6： | 1 |
| 11 | KOH-assisted aqueous synthesis of ZIF-67 with high-yield and its derived cobalt selenide/carbon composites for high-performance Li-ion batteries显示文摘To solve the environmental pollution and low yield during the sythesis of zeolitic imidazolate frameworks(ZIFs)and their derived materials,a KOH-assisted aqueous strategy is proposed to synthesize cobalt zeolitic imidazolate framework(ZIF-67)polyhedrons,which are used as precursors to prepare cobalt selenide/carbon composites with different crystal phases(Co_(0.85)Se,CoSe_2).When evaluated as anode material for lithium ion batteries,Co_(0.85)Se/C composites deliver a reversible capacity of 758.7 m A·h·g^(-1)with a capacity retention rate of 90.5%at 1.0 A·g^(-1)after 500 cycles,and the superior rate capability is 620 m A·h·g^(-1)at 2.0 A·g^(-1).The addition of KOH accelerates the production of ZIF-67 crystals by boosting deprotonation of dimethylimidazole,resulting in rapid growth and structures transition from two-dimensional to three-dimensional of ZIF-67 in aqueous solution,which greatly promotes the application of MOFs in the field of energy storage and conversion. | Kai Xue Yanchun Xue Jing Wang Shuya Zhang Xingmei Guo Xiangjun Zheng Fu Cao Qinghong Kong Junhao Zhang Zhong Jin | 2023 | Chinese Journal of Chemical Engineering2023，57，5： | 0 |
| 12 | Did the MS 7.0 Lushan earthquake dynamically trigger earthquakes in the Datong volcanic region(Shanxi Province)?显示文摘Immediately following the MS7.0 Lushan earthquake on April 20,2013,using high-pass and lowpass filtering on the digital seismic stations in the Shanxi Province,located about 870–1,452 km from the earthquake epicenter,we detected some earthquakes at a time corresponding to the first arrival of surface waves in high-pass filtering waveform.The earthquakes were especially noticed at stations in Youyu(YUY),Shanzizao(SZZ),Shanghuangzhuang(SHZ),and Zhenchuan(ZCH),which are located in a volcanic region in the Shanxi Province,but they were not listed in the Shanxi seismic observation report.These earthquakes occurred 4–50 min after the passage of the maximum amplitude Rayleigh wave,and the periods of the surface waves were mainly between 15 and20 s following.The Coulomb stresses caused by the Rayleigh waves that acted on the four stations was about0.001 MPa,which is a little lower than the threshold value of dynamic triggering,therefore,we may conclude that the Datong volcanic region is more sensitive to the Coulomb stress change.To verify,if the similar phenomena are widespread,we used the same filtering to observecontrastively continuous waveform data before,and 5 h after,the MS7.0 Lushan earthquake and MS9.0 Tohoku earthquake in 2011.The results show that the similar phenomena occur before the earthquakes,but the seismicity rates after the earthquakes are remarkably increased.Since these weak earthquakes are quite small,it is hard to get clear phase arrival time from three or more stations to locate them.In addition,the travel time differences between P waves and S waves(S–P)are all less than 4 s,that means the events should occur in 34 km around the stations in the volcanic region.The stress of initial dynamic triggering of the MS9.0 Tohoku earthquake was about0.09 MPa,which is much higher than the threshold value of dynamic triggering stress.The earthquakes after the MS9.0 Tohoku earthquake are related to dynamic triggering stress,but the events before the earthquake cannot be linked to seismic events,but may be related to the background seismicity or from other kinds of local sources,such as anthropogenic sources(i.e.,explosions).Using two teleseismic filtering,the small background earthquakes in the Datong volcanic region occur frequently,thus we postulate that previous catalog does not apply bandpass filter to pick out the weak earthquakes,and some of the observed weak events were not triggered by changes in the dynamic stress field. | Meiqin Song Yong Zheng Rui Fu Xiangjun Liang Xia Wang Li Li Bin Li | 2013 | Earthquake Science2013，26，3： | 0 |
| 13 | Fabricating titanium dioxide/N-doped carbon nanofibers as advanced interlayer for improving cycling reversibility of lithium-sulfur batteries显示文摘'Shuttle effect' is detrimental for maintaining the high capacity and cycling reversibility of lithium-sulfur batteries(LSBs).To inhibit polysulfide migration,N-doped carbon nanofibers(N-CNFs) membrane comprising TiO_(2)nanoparticles(TiO_(2)/N-CNFs) is fabricated using an electrospinning-calcination method and further applied as interlayer in LSBs.The TiO_(2)/N-CNFs interlayer helps the battery to deliver a high specific capacity of 1155.2 mA·h·g^(-1)at 0.2 C with high Coulombic efficiency,good rate capability and stability.When cycling at 0.5 C,a capacity retention rate of 62.4% is achieved over 300 cycles,which is higher than that of CNFs and TiO_(2)/CNFs counterparts.The excellent performance should mainly be attributed to the alleviated 'shuttle effect' deriving from high polysulfide trapping ability of TiO_(2)nanoparticles and N heteroatoms in interwoven CNFs. | Xingmei Guo Jinfeng Xie Jing Wang Shangqing Sun Feng Zhang Fu Cao Yuanjun Liu Xiangjun Zheng Junhao Zhang Qinghong Kong | 2022 | Chinese Journal of Chemical Engineering2022，，12： | 0 |
| 14 | Bee Colony Optimization Algorithm for Routing and Wavelength Assignment Based on Directional Guidance in Satellite Optical Networks显示文摘With the development of satellite communication,in order to solve the problems of shortage of on-board resources and refinement of delay requirements to improve the communication performance of satellite optical networks,this paper proposes a bee colony optimization algorithm for routing and wavelength assignment based on directional guidance(DBCO-RWA)in satellite optical networks.In D-BCORWA,directional guidance based on relative position and link load is defined,and then the link cost function in the path search stage is established based on the directional guidance factor.Finally,feasible solutions are expanded in the global optimization stage.The wavelength utilization,communication success probability,blocking rate,communication hops and convergence characteristic are simulated.The results show that the performance of the proposed algorithm is improved compared with existing algorithms. | Mai Yang Qi Zhang Haipeng Yao Ran Gao Xiangjun Xin Feng Tian Weiying Feng Dong Chen Fu Wang Qinghua Tian Jinxi Qian | 2023 | China Communications2023，20，7： | 0 |
| 15 | Atmospheric correction of HJ-1 A/B CCD over land: Land surface reflectance calculation for geographical information product显示文摘这份报纸建议了一个方法从 HJ-1A/B 电荷耦合器件数据检索陆地表面反射。喷雾器光深度(AOD ) ,影响电荷耦合器件的大气的修正的最重要的因素根本想象乐队,被建议由稠密的黑暗的途径从电荷耦合器件形象检索植被(DDV ) 方法。一张查找表格为许多太阳传感器几何学和喷雾器装载以象 AOD 的功能的发射度,路径发光和大气的球形的反照率被建立。大气的修正然后作为 priori 数据集与查找表格和 MODIS 表面反射产量(MOD09 ) 被完成。基于检索 AOD 和大气的修正系数的查找表格,陆地表面反射根据大气的放射的转移方程为 HJ-1A/B 数据被检索。一些在原处,为在华东和 MODIS 陆地表面反射产品 MOD09 的山东省的 Yanzhou 的测量数据被用来 preliminarily 验证建议方法。结果证明建议方法能有效地移开大气的贡献,和检索陆地表面反射的全面精确性能实质地被改进。 | FU Qiaoyan MIN Xiangjun SUN Lin MA Shengfang | 2014 | Journal of Geographical Sciences2014，24，6： | 0 |
| 16 | Modeling of Few-Mode Multi-Core Optical Fiber Channe Based on Non-Uniform Mode Field Distribution显示文摘In this paper, the influencing factors that affect few-mode and multi core optical fiber channel are analyzed in a comprehensive way. The theoretical modeling and computer simulation of the information channel are carried out and then the modeling scheme of few-mode multicore optical fiber channel based on non-uniform mode field distribution is put forward. The proposed modeling scheme can not only exponentially increases the system capacity through fewmode multi-core optical fiber channel, but has better transmission performance compared to the channel of the same type to the uniform channel revealing from the simulation results. | Hang Zhou Bo Liu Fu Wang Dandan Song Li Li Xiangjun Xin Qinghua Tian Qi Zhang Feng Tian | 2016 | China Communications2016，13，8： | 0 |
| 17 | Low Energy H^+ Effects on the Photovoltaic and Optical Properties of Polycrystalline Silicon Solar Cells显示文摘0IntroductionThepolycrystalinesilicon(poly-Si)solarcelisconsideredtobeoneofthemostpromisingcelscapableofachievingbothhighefic... | Li, Jinchai Wu, Xiangao Ye, Mingsheng Fu, Qiang Fan, Xiangjun | 1999 | Wuhan University Journal of Natural Sciences1999，4，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员