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Photosynthetically active radiation retrieval based on HJ-1A/B satellite data

science china Earth {2. 2010年第S1期53卷 81-91页

作者： li li1,xin xiaozhou1,{2.,{3. liu qinhuo1 1 state key Laboratory of remote Sensing science,institute of remote Sensing {{12.,{13.,Beijing 100101,china 2.Zhejiang Climate Center,Hangzhou 3.0017,china state key Laboratory of {2. Sensing {3. Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing China Zhejiang Climate Center Hangzhou China

Photosynthetically active radiation(PAR) is essential for plant photosynthesis and carbon cycle,and is also important for meteorological and environmental *** advance china's disaster and environmental monitoring capabilities,the HJ-1A/B satellites have been placed in Earth *** of their environmental monitoring objectives is the study of *** simulated direct solar,scattered and environment radiation between 400 and 700 nm under different atmospheric parameters(solar zenith angle,atmospheric water vapor,atmospheric ozone,aerosol optical thickness,{3.rface elevation and {3.rface albedo),and then established a look-up table between these input parameters and *** on the look-up table,we used HJ-1A/B aerosol and {3.rface albedo outputs to derive the corresponding *** of inversed instantaneous and observed PAR values using HJ-1 Heihe experimental data had a root mean square error of 2..2.W m-2.with a relative error of 5.9%.The root mean square error for accumulated daily PAR and observed values was 0.49 MJ m-2.with a relative error of 3.5%.Our approach improved significantly the computational efficiency,compared with using directly radiation transfer *** also studied the sensitivity of various input parameters to photosynthetically active radiation,and found that solar zenith angle and atmospheric aerosols were sensitive PAR *** albedo had some effect on PAR,but water vapor and ozone had minimal impact on PAR.

关键词： Photosynthetically active radiation 6S HJ-1A/B satellites

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Cotton pixel identification with CBERS-02.CCD data based on spectral knowledge

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science china(Technological {2.) 2005年第S2期48卷 129-144页

作者： li Jing1,2.3. liu {2.,3. liu Qiang1, CHEN liangfu1, BO Junhua3.& li Shaokun3.1. state key Laboratory of remote Sensing science, IRSA, chinese academy of sciences, Beijing 100101, {12. 2. Graduate University of chinese academy of sciences, Beijing 100049, {12. 3. The key Oasis Eco-agriculture Laboratory of xinjiang Production and Construction Corps, Shi Hezi 83.1}00, {12. state key Laboratory of {2. Sensing {3. IRSA Chinese Academy of Sciences Beijing 100101 China Graduate University Chinese Academy of Sciences Beijing 100049 China key Oasis Eco-agriculture Laboratory Xinjiang Production and Construction Corps. Shi Hezi 832000 China

In this paper the in-situ experiment data are collected from the Spectral library to estimate the possible values of the primary structural parameters in each cotton growing season by statistics. Based on these values the spectra of the cotton major growing seasons were simulated and analyzed using the canopy reflectance model, SAILH. In this way we also simulated the cotton pixel spectra corresponding to CBERS-02.CCD and took them as the reference spectra for spectra fitting. Then No.143.Regiment of No.8 Agricultural Division of xinjiang Production and Construction Corps (XPCC) was chosen as the study area, and two spectra fitting methods, Mahalanobis distance and spectra angle, were used to identify cotton pixel from CBERS-02.CCD image of the study area. At last we analyzed the effect of the calibration coefficients error on cotton identifying. The results showed that within 4% error the spectral angle classifier can still have a good performance.

关键词： CBERS-02 cotton pixel identification spectra fitting.

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Estimating surface evapotranspiration using combined MODIS and CBERS-02.data

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science china(Technological {2.) 2005年第S2期48卷 145-160页

作者： xin xiaozhou1,2. liu {2., TANG Yong1,3. TIAN Guoliang1, GU xingfa1, li Xiaowen1,2. ZHENG Hongsheng4 & CHEN Jiayi4 1. state key Laboratory of remote Sensing science, institute of remote Sensing {12., chinese academy of sciences, Beijing {12., china 2. Research Center for remote Sensing and GIS, Department of Geography, Beijing Normal University, Beijing 100875, china 3. Graduate University of chinese academy of sciences, Beijing 10003., china 4. Department of Atmospheric Physics, Peking University, Beijing 100871, china state key Laboratory of {2. Sensing {3. Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China Research Center for remote Sensing and GIS Department of Geography Beijing Normal University Beijing 100875 China Graduate University Chinese Academy of Sciences Beijing 100039 China Department of Atmospheric Physics Peking University Beijing 100871 China

Spatial scale error is one of the most serious problems in the estimates of land surface heat fluxes of sensible and latent from satellite-borne data such as MODIS 1km resolution reflectance and emissive data. One of the feasible and economic ways to decrease the spatial scale error is to use high resolution land use class data together with the MODIS data. CBERS-0{3.data were used to produce land use class of Baiyangdian area, Hebei Province, china in the autumn of {3.04. The area ratio of each class in MODIS pixel was calculated, and used to derive the heat fluxes of the mixed pixel. The results showed that the estimated heat fluxes of soil, sensible and latent have been changed remarkably after using the high resolution land class data. It could be concluded from the comparison between simulated and ground-measured fluxes as well as the theoretical analysis that high resolution land class data are useful to diminishing the scale error of heat fluxes estimated from low resolution satellite data.

关键词： surface evapotranspiration spatial scale error MODIS CBERS land class.

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Controllable Ring-opening Polymerization ofδ-Valerolactone Catalyzed by Quinolinyl-Urea/MTBD Systems

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chinese Journal of Polymer science 2024年第8期42卷 1103-1110页

作者： xin-Yu liu {2.ang Zhu {3.-Yun Jie Bo-Geng {2. state key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058China

Due to their excellent biocompatibility and biodegradability,aliphatic polyesters are widely used in the biomedical,packaging and agricultural fields,which are u{3.ally accessed by the ring-opening polymerization(ROP)of lactones and the catalysts particularly play an important *** a series of quinolinyl-urea catalysts have been synthesized via the reaction between isocyanate and aminoquinoline with an amino group at different {3.bstitution positions and *** combination with 7-methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene(MTBD)as a cocatalyst and benzyl alcohol(BnOH)as an initiator,1-(3.5-bis(trifluoromethyl)phenyl)-3.(quinolin-3.yl)urea(3.QU)was observed to be most active for the ROP ofδ-valerolactone(δ-VL).The polymerization conditions were optimized by varying the type of organic base,catalyst concentration and reaction *** changing the ratio of[M]_0/[I],linear polyvalerolactones(PVLs)with different molecular weights and narrow molecular weight distribution were *** kinetic and chain extension experiments were carried out to prove the"living"/controllable *** the NMR experiments were used to {3.pport the proposal of possible mechanism.

关键词： Quinolinyl-urea Ring-opening polymerization PVL

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A highly reduced Mo_(74) polyoxometalate featuring high proton conductivity accessed by building block strategy

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science china Chemistry 2024年第3期67卷 862-868页

作者： Shi-Yi liu Xue-xin {2. Wei-Chao Chen Kui-Zhan Shao xin-Long Wang Chao Qin Zhong-Min su key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Department of ChemistryNortheast Normal UniversityChangchun 130024China state key Laboratory of {2.pramolecular Structure and Materials Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchun 130021China

Highly reduced polyoxometalates(POMs) are predicted to be used as rather high energy density materials;however,it still suffers from the limited cluster species and reduction *** we demonstrate that it is possible to employ the building block strategy to generate a highly reduced polyoxomolybdate(C_(2.H_(8)N)_(14)(NH_(4))_(4)H_(14)[Mo_(48)-ⅤMo_(2.)ⅥO_(2.2.(OH)_({2.(SO_(4))_(6)]·46H_(2.O(Mo_(74)).The fundamental Mo-based{Mo_x}(x=4,5,and 6) building blocks,which are templated by tetra-coordinated anions{MoO_(4)}or{SO_(4)},not only lay foundation for the formation of Mo_(74) featuring an unprecedented reduction ratio of 65%,but also give rise to SBBs-mediated(secondary building blocks) supramolecular dense packing interactions among the isolated Mo_(74) clusters that are favorable for proton ***,high proton conductivity(2.04×10^(-2.S cm^(-1)) had been realized at 50℃ and 90% relative humidity,revealing one of the well-known POMs-based crystalline proton conducting *** result highlights that this building block approach possesses great potential in producing highly reduced POM systems that can achieve controllable reduced ratio and desirable properties.

关键词： polyoxometalate building block molybdenum highly reduced state proton conduction

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Post-earthquake assessment of building damage degree using liDAR data and imagery

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science china(Technological {2.) 2008年第S2期51卷 133-143页

作者： li ManChun1,CHENG liang1,2.GONG JianYa2.{2. YongXue1,CHEN ZhenJie1,li FeiXue1,CHEN Gang1,CHEN Dong1 & SONG XiaoGang3.1 Department of Geographic Information science,Nanjing University,Nanjing 2.0093.china 2.state key Laboratory of Information Engineering in surveying,Mapping and {13. Sensing,Wuhan University,Wuhan 43.079,china 3.state key Laboratory of Earthquake Dynamics,institute of Geology,china Earthquake Administration,Beijing 10002.,china Department of Geographic Information science Nanjing University Nanjing China state key Laboratory of Information Engineering in {2.rveying Mapping and Remote Sensing Wuhan University Wuhan China state key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing China

Various methods have been developed to detect and assess building's damages due to earthquakes using remotely sensed *** the launch of the high resolution sensors such as IKONOS and QuickBird,it becomes rea{2.stic to identify damages on the scale of individual *** the low accuracy of the results has often led to the use of visual interpretation ***,it is very difficult to estimate the degree of building damage(*** damage,moderate damage,or severe damage) in detail using the existing ***,a novel approach integrating {2.DAR data and high resolution optical imagery is proposed for evaluating building damage degree *** approach consists of two steps:3. building model reconstruction and rooftop patch-oriented 3. change ***,a method is proposed for automatically reconstructing 3. building models with precise geometric position and fine details,using pre-earthquake {2.DAR data and high resolution ***,focusing on each rooftop patch of the 3. building models,the pre- and post-earthquake {2.DAR points belonging to the patch are collected and compared to detect whether it was destroyed or not,and then the degree of building damage can be identified based on the ratio of the destroyed rooftop patches to all rooftop *** novelty of the proposed approach is to detect damages on the scale of building's rooftop patch and rea{2.ze quantitative estimation of building damage degree.

关键词： post-earthquake assessment building damage degree rooftop patch liDAR imagery

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Quantitative estimation of the shrub canopy LAI from atmosphere-corrected HJ-1 CCD data in Mu Us Sandland

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science china Earth {2. 2010年第S1期53卷 26-33页

作者： CHEN Wei1,2,CAO ChunXiang1,HE QiSheng1,2,GUO HuaDong3.ZHANG Hao1,2,li RenQiang4,ZHENG Sheng1,2,XU Min1,2,GAO MengXu1,2,ZHAO Jian1,2,li Sha1,NI Xiliang1,2,JIA HuiCong1,JI Wei1,TIAN Rong1,2,{3. Cheng1,2,ZHAO Yuxing5 & li JingLu6 1 state key Laboratory of remote Sensing science,Jointly Sponsored by the institute of remote Sensing applications of {13. and Beijing Normal University,Beijing 100101,china 2 Graduate University of {13.,Beijing 100049,china 3.Center for Earth Observation and Digital Earth,{13.,Beijing 100190,china 4 china key Laboratory of Ecological Network Observation and Modeling,institute of Geographical sciences and Natural Resources Research,{13.,Beijing 100101,china 5 Ordos Forestry Sand Control science institute,Dongsheng 017000,china 6 Inner Mongolia Biomass Thermoelectricity limited Company,Wushen 0173.0,china state key Laboratory of {2. Sensing {3. Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Beijing China Graduate University of chinese academy of sciences Beijing China Center for Earth Observation and Digital Earth Chinese Academy of Sciences Beijing China china key Laboratory of Ecological Network Observation and Mode{2.ng Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Ordos Forestry Sand Control science institute Dongsheng China Inner Mongolia Biomass Thermoelectricity limited Company Wushen China

The leaf area index(LAI) is an important ecological parameter that characterizes the interface between vegetation canopy and the *** addition,it is used by most process-oriented ecosystem *** paper investigates the potential of HJ-1 CCD data combined with linear spectral unmixing and an inverted geometric-optical model for the retrieval of the shrub LAI in Wushen Banner of Inner Mongolia in the Mu Us ***(Moderate Resolution Atmospheric Radiance and Transmittance Model) was used for atmospheric *** was extracted using the threshold of the normalized difference vegetation index,with which water bodies and farmland were separated,in combination with a vegetation map of the People's Republic of china(1:1000000).Using the geometric-optical model,we derive the per-pixel reflectance as a simple linear combination of two components,namely sunlit background and *** fraction of sunlit background is related to the shrub *** the support of HJ-1 CCD data,we employ linear spectral unmixing to obtain the fraction of sunlit background in an atmospherically corrected HJ *** addition,we use the measured shrub canopy structural parameters for shrub communities to invert the geometric-optical model and retrieve the pixel-based shrub *** total,18 sample plots collected in Wushen Banner of Inner Mongolia are used for *** results of the shrub LAI show good agreement with R2.of 0.817 and a root-mean-squared error of 0.173.

关键词： shrub leaf area index inversion HJ-1 data geometric-optical model MODTRAN Mu Us Sandland

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Exceptional electrostrain with minimal hysteresis and superior temperature stability under low electric field in KNN-based lead-free piezoceramics

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Journal of Advanced Ceramics 2024年第3期13卷 364-372页

作者： Huan liu Yijin Hao Ziqi Yang Tianyi Feng Bin su {2. Zhang Mengping Xue Bo-Ping Zhang Jing-Feng {3. Beijing Municipal key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China state key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Over the past two decades,(K_(0.5)Na_(0.5))NbO_(3.(KNN)-based lead-free piezoelectric ceramics have made significant ***,attaining a high electrostrain with remarkable temperature stability and minimal hysteresis under low electric fields has remained a significant *** address this long-standing issue,we have employed a collaborative approach that combines defect engineering,phase engineering,and relaxation *** LKNNS-6BZH ceramic,when sintered at T_(sint)=1170℃,demonstrates an impressive electrostrain with a d_(3.) value of 0.2.6%and 13.9 pm·V^(-1)under 2. kV·cm^(-1),which is comparable to or even surpasses that of other lead-free and Pb(Zr,Ti)O_(3.***,the electrostrain performance of this ceramic remains stable up to a temperature of 12.℃,with the lowest hysteresis observed at 9.73.under 40 kV·cm^(-1).These excellent overall performances are attributed to the presence of defect dipoles involving V′_(A)-V∙∙_(O) and B′_(Nb)-V∙∙O,the coexistence of R-O-T multiphase,and the tuning of the trade-off between long-range ordering and local *** work provides a lead-free alternative for piezoelectric actuators and a paradigm for designing piezoelectric materials with outstanding comprehensive performance under low electric fields.

关键词： lead-free piezoelectric ceramics temperature stability electrostrain potassium sodium niobate low hysteresis

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Knockdown of the atypical protein kinase genes GhABC1K2.A05 and GhABC1K12.A07 make cotton more sensitive to salt and PEG stress

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Journal of Integrative Agriculture 2024年第10期23卷 3370-3386页

作者： Caixiang Wang Meili li Dingguo Zhang Xueli Zhang Juanjuan {3. Junji su state key Laboratory of Aridland Crop {2./College of {3.fe {2. and Technology Gansu Agricultural UniversityLanzhou730070China Western Agricultural Research Center Chinese Academy of Agricultural SciencesChangji 831100China College of Biology and Geographical sciences Yili Normal UniversityYining 835000China

Activity of bc1 complex kinase(ABC1K)is an atypical protein kinase(aPK)that plays a crucial role in plant mitochondrial and plastid stress responses,but little is known about the responses of ABC1Ks to stress in cotton(Gossypium spp.).Here,we identified 40 ABC1Ks in upland cotton(Gossypium hirsutum L.)and found that the Gh ABC1Ks were unevenly distributed across 17 *** GhABC1K family members included 3. paralogous gene pairs and were expanded by segmental *** GhABC1K promoter sequences contained diverse cis-acting regulatory elements relevant to hormone or stress *** qRT-PCR results revealed that most Gh ABC1Ks were upregulated by exposure to different *** ABC1K2.A05 and Gh ABC1K12.A07 expression levels were upregulated by at least three stress *** genes were further functionally characterized by virus-induced gene silencing(VIGS).Compared with the controls,the Gh ABC1K2.A05-and Gh ABC1K12.A07-silenced cotton lines exhibited higher malondialdehyde(MDA)contents,lower catalase(CAT),peroxidase(POD)and superoxide dismutase(SOD)activities and reduced chlorophyll and soluble sugar contents under NaCl and PEG *** addition,the expression levels of six stress marker genes(Gh DREB2.,Gh SOS1,Gh CIPK6,Gh SOS2.Gh WRKY3.,and Gh RD2.A)were significantly downregulated after stress in the Gh ABC1K2.A05-and Gh ABC1K12.A07-silenced *** results indicate that knockdown of Gh ABC1K2.A05 and Gh ABC1K12.A07 make cotton more sensitive to salt and PEG *** findings can provide valuable information for intensive studies of Gh ABC1Ks in the responses and resistance of cotton to abiotic stresses.

关键词： cotton ABC1K abiotic stress responses expression patterns virus-induced gene silencing(VIGS)

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lithosphere types in North china:Evidence from geology and geophysics

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science china Earth {2. 2005年第11期48卷 1809-1827页

作者： QIU Ruizhao1,2, DENG Jinfu3. ZHOU su3. li Jinfa4, XIAO Qinghui1,5, WU Zongxu6 & liu Cui3.1. {3. of Geology, chinese academy of Geological sciences, Beijing 10003., china 2. Development and Research Center, china Geological survey, Beijing 10003., china 3. china University of Geosciences, Beijing 100083. china 4. china University of Geosciences, Wuhan 43.074, china 5. Information Center of Ministry of Land and Resources, Beijing 100812. china 6. {3. of Geology, state Seismological Bureau, Beijing 100029, china institute of Geology Chinese Academy of Geological Sciences Beijing China Development and Research Center China Geological Survey Beijing China china University of Geosciences Beijing China china University of Geosciences Wuhan China Information Center of Ministry of Land and Resources Beijing China institute of Geology State Seismological Bureau Beijing China

On the basis of the characteristics of geology and geophysics in North china, three types of lithosphere, namely, the cratonic, the orogenic and the rift lithospheres can be classified. In terms of petrological method (based on the information from Precambrian rock assemblages, igneous activities, deep-seated enclaves, etc.) and the relationship between seismic velocity and rock compositions, the crust-mantle petrological and chemical structure models can be set up. Researching re{3.lts indicate that the geology and geophysics of North china platform bears the similar characteristics in comparison with those of the global typical cratons. The Eerduosi(Ordos) block located in the west of the North china Platform is a remnant of cratonic lithosphere after the North china platform had undergone “activation” in Mesozoic and “reconstruction” in Cenozoic times. The continental crust consists mainly of TTG rock assemblage while the {3.bcontinental lithosphere mantle mainly consists of strongly depleted harzburgite. The craton was finally formed in late Archaean and early Proterozoic, and has been kept in stability up to present; its crustal-mantle petrological structures of lithosphere can be set up as a reference for the study of North china craton and even Sino-Korean craton. In the Mesozoic period, the middle and east areas of North china platform were activated in the Yanshanian orogenic process, the continental crust was reformed by material and heat-transfer of convective mantle and the original crustal TTG component was reconstructed to be granitic crust, and the {3.bcontinental lithosphere man- tle was replaced by the Yanshanian harzburgite-lherzolite. The Yanshan-Taihang Mountains were the remnants of orogenic lithosphere after the rifting in eastern North china in Cenozoic. The present thickness of continental crust and lithosphere in the Yanshan-Taihang Mountains is not equal to their thickness during the Yanshanian orogenic movement because they had undergone the

关键词： lithospheric types,evidence of geology and geophysics,crust-mantle petrological structure,deep process

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