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| 1 | Geographical characteristics of China’s wetlands derived from remotely sensed data显示文摘In this paper, we report the first wetland mapping of the entire China using Landsat enhanced thematic mapper plus (ETM+) data. These data were obtained from the Global Land Cover Facility at the University of Maryland spanning from 1999 to 2002. A total of 597 scenes of Landsat images were georeferenced and mosaiced. Manual image interpretation of satellite images was aided with elevation data, soil data, land cover/land use data and Google Earth. The minimum mapping unit is 10 pixel × 10 pixel, equivalent to 9 ha. The aim of our first round of mapping was only targeted at the boundary delineation of any type of wetland except those wetlands that are under agricultural use (i.e., paddy fields), which has already been well mapped by others. Our interpretation results indicate that a total of 359478 km2 of wetlands are of non-agricultural use. Among our preliminarily mapped wetland, 339353 km2 are inland wetland, 2786 km2 are non-agricultural artificial wetland, and 17609 km2 are coastal wetland. Because low-tide is rarely captured in satellite images, an under-estimation of coastal wetland is inevitable. We conducted some statistics based on our mapped wetlands and compared them with those previously obtained from a number of sources including a land cover/land use map made with satellite images during the late 1990s and early 2000s, a marshland map developed in approximately the same period, survey data of coastal wetland in early 1980s, and area data for approximately 400 larger patches of marshland in China compiled in 1996. Because some inconsistencies exist in the guidelines of those different wetland surveys, difference in area is expected. Some further comparison indicates that the wetland distributions derived from the preliminary wetland map are reasonable and more objective than other sources. The mapping process also indicated that the method adopted by us was efficient and cost-effective. We also found that in order to ensure comparability of the wetland maps developed at different times, a set of standard guidelines on the wetland categories to be mapped, and the mapping methods to be used must be well conceived, developed and effectively employed. We carried out some initial geographical analysis on the distribution of wetlands. | NIU ZhenGuo GONG Peng CHENG Xiao GUO JianHong WANG Lin HUANG HuaBing SHEN ShaoQing WU YunZhao WANG XiaoFeng WANG XianWei YING Qing LIANG Lu ZHANG LiNa WANG Lei YAO Qian YANG ZhenZhong GUO ZiQi DAI YongJiu | 2009 | Science China Earth Sciences2009，52，6： | 15 |
| 2 | Theoretical analysis and numerical simulation on behaviour properties of large span cable-supported structures under fire conditions显示文摘Large span cable-supported structures have been developed rapidly in China, and they always adopt high-strength steel cables as structural members. However, the modulus of elasticity and yield strength of steel material will decrease seriously under fire conditions while fire protection is unlikely to be provided for steel cable. Several typical large span cable-supported structures such as cable truss, beam string structure and prestressed cable net are studied on their structural behaviour in this paper. Theoretical formulae are derived in terms of geometrical and material nonlinearity with high temperature effect. Finite element models are also established to simulate the structural performance under fire conditions. The calculation formulae for fire-resisting design are suggested for these three types of structures, while displacement and prestressed force variation rules are also given. | BAI Yin SHI YongJiu WANG YuanQing | 2009 | Science China(Technological Sciences)2009，52，8： | 6 |
| 3 | Adipocyte-derived SFRP5 inhibits breast cancer cells migration and invasion through Wnt and epithelial-mesenchymal transition signaling pathways显示文摘Objective:Obesity is closely associated with metastasis in breast cancer patients.Secreted frizzled-related protein 5(SFRP5),one of the novel adipokines with anti-inflammatory properties,is associated with obesity.This study aims to study the role of SFRP5 in the crosstalk between obesity and breast cancer metastasis and identify the underlying mechanism.Methods:3T3-L1 pre-adipocytes were differentiated to mature adipocytes and a hypertrophic adipocyte model was induced with palmitic acid(PA).Cell motility was measured in MDA-MB-231 and MCF-7 breast cancer cells co-cultured with adipocytes conditioned medium(CM)with or without SFRP5 protein.Wnt and epithelialmesenchymal transition(EMT)signal pathways were investigated by western blot.Circulating SFRP5 level in 218 breast cancer patients and the association with clinicopathologic characteristics of breast cancer were further determined.Online databases ENCORI and PREDICT Plus were used to exam the link between SFRP5 and prognosis.Results:Reduced SFRP5 level was detected in the hypertrophic adipocyte model.Recombinant SFRP5 protein inhibited MDA-MB-231 and MCF-7 cells invasion and migration induced by PA-treated adipocyte CM,and SFRP5 inhibition by specific antibody reversed the effect of SFRP5.Furthermore,SFRP5 significantly inhibited Wnt and downstream EMT in breast cancer cells.Low circulating SFRP5 level correlated with body mass index(BMI),lymph node(LN)metastasis,TNM stage and high Ki67 expression in breast cancer patients.Increased SFRP5 level was associated with favorable predicted survival.Kaplan-Meier curves showed high SFRP5 level in tumor tissue was associated with better outcome of breast cancer patients.Conclusions:Our findings demonstrated SFRP5 is a vital adipokine that mediates the crosslink between obesity and the metastatic potential of breast cancer.Promotion of SFRP5 expression in the adipose microenvironment may represent a novel approach for preventing breast cancer metastasis. | Wenzhong Zhou Chunmiao Ye Liang Li Liyuan Liu Fei Wang Lixiang Yu Fei Zhou Yujuan Xiang Yongjiu Wang Gengshen Yin Zhongbing Ma Qinye Fu Qiang Zhang Dezong Gao Shuya Huang Zhigang Yu | 2020 | Chinese Journal of Cancer Research2020，32，3： | 5 |
| 4 | Experimental research on behavior of 460 MPa high strength steel I-section columns under cyclic loading显示文摘To investigate the seismic behavior of I-section columns made of 460 MPa high strength steel(HSS), six specimens were tested under constant axial load and cyclic horizontal load. The specimens were designed with different width-to-thickness ratios and loaded under different axial load ratios. For each specimen, the failure mode was observed and hysteretic curve was measured. Comparison of different specimens on hysteretic characteristic, energy dissipation capacity and deformation capacity were further investigated. Test results showed that the degradation of bearing capacity was due to local buckling of flange and web. Under the same axial load ratio, as width-to-thickness ratio increased, the deformation area of local buckling became smaller. And also, displacement level at both peak load and failure load became smaller. In addition, the full extent of hysteretic curve, energy dissipation capacity, ultimate story drift angle decreased, and capacity degradation occurred more rapidly with the increase of width-to-thickness ratio or axial load ratio. Based on the capacity of story drift angle, limiting values which shall not be exceeded are suggested respectively for flange and web plate of 460 MPa HSS I-section columns when used in SMFs and in IMFs in the case of axial load ratio no more than 0.2. Such values should be smaller when the axial load ratio increases. | Wang Jiaojiao Shi Gang Shi Yongjiu | 2014 | Earthquake Engineering and Engineering Vibration2014，13，4： | 5 |
| 5 | Evaluating Common Land Model Energy Fluxes Using FLUXNET Data显示文摘Given the crucial role of land surface processes in global and regional climates, there is a pressing need to test and verify the performance of land surface models via comparisons to observations. In this study, the eddy covariance measurements from 20 FLUXNET sites spanning more than 100 site-years were utilized to evaluate the performance of the Common Land Model(Co LM) over different vegetation types in various climate zones. A decomposition method was employed to separate both the observed and simulated energy fluxes, i.e., the sensible heat flux, latent heat flux, net radiation, and ground heat flux, at three timescales ranging from stepwise(30 min) to monthly. A comparison between the simulations and observations indicated that Co LM produced satisfactory simulations of all four energy fluxes, although the different indexes did not exhibit consistent results among the different fluxes. A strong agreement between the simulations and observations was found for the seasonal cycles at the 20 sites, whereas Co LM underestimated the latent heat flux at the sites with distinct dry and wet seasons, which might be associated with its weakness in simulating soil water during the dry season. Co LM cannot explicitly simulate the midday depression of leaf gas exchange, which may explain why Co LM also has a maximum diurnal bias at noon in the summer. Of the eight selected vegetation types analyzed, Co LM performs best for evergreen broadleaf forests and worst for croplands and wetlands. | Xiangxiang ZHANG Yongjiu DAI Hongzhi CUI Robert E.DICKINSON Siguang ZHU Nan WEI Binyan YAN Hua YUAN Wei SHANGGUAN Lili WANG Wenting FU | 2017 | Advances in Atmospheric Sciences2017，34，9： | 4 |
| 6 | Analysis of lateral stability of I-section aluminum beams显示文摘This paper focuses on the lateral buckling of laterally-unrestrained aluminum beams subjected to a concentrated, uniformly loading and pure-bending action. The design methods of lateral stability of aluminum beams in the current codes are discussed. The influence of material property on the lateral buckling of aluminum beams is investigated with finite element analysis (FEA) methods. Some numerical examples are given, and the results from current codes are compared with the FEA solutions. The design method on lateral stability of steel beams specified in the Chinese standard GB 50017-2003 is modified to calibrate the stability factors of aluminum beams according to the European code, British code, and American code, and the modified method is verified by FEA results. Through comparison with the available test results, the modified design method for overall stability of aluminum bending members is proposed in this paper and proved applicable in the design of lateral stability of aluminum beams. | CHENG Ming SHI Yongjiu WANG Yuanqing | 2006 | Science China(Technological Sciences)2006，49，6： | 4 |
| 7 | Mapping Near-surface Air Temperature, Pressure, Relative Humidity and Wind Speed over China's Mainland with High Spatiotemporal Resolution显示文摘As part of a joint effort to construct an atmospheric forcing dataset for China's Mainland with high spatiotemporal resolution, a new approach is proposed to construct gridded near-surface temperature, relative humidity, wind speed and surface pressure with a resolution of 1 km×1 km. The approach comprises two steps:(1) fit a partial thin-plate smoothing spline with orography and reanalysis data as explanatory variables to ground-based observations for estimating a trend surface;(2)apply a simple kriging procedure to the residual for trend surface correction.The proposed approach is applied to observations collected at approximately 700 stations over China's Mainland. The generated forcing fields are compared with the corresponding components of the National Centers for Environmental Prediction(NCEP) Climate Forecast System Reanalysis dataset and the Princeton meteorological forcing dataset. The comparison shows that, both within the station network and within the resolutions of the two gridded datasets, the interpolation errors of the proposed approach are markedly smaller than the two gridded datasets. | LI Tao ZHENG Xiaogu DAI Yongjiu YANG Chi CHEN Zhuoqi ZHANG Shupeng WU Guocan WANG Zhonglei HUANG Chengcheng SHEN Yan LIAO Rongwei | 2014 | Advances in Atmospheric Sciences2014，31，5： | 3 |
| 8 | Experimental and constitutive model study of structural steel under cyclic loading显示文摘 | Yongjiu Shi Meng Wang Yuanqing Wang | 2011 | Journal of Constructional Steel Research2011，，8： | 3 |
| 9 | Research on the random seismic response analysis for multi- and large-span structures to multi-support excitations显示文摘The pseudo excitation method(PEM) has been improved into a more practical form,on which the analytic formulae of seismic response power spectral density(PSD) of simplified large-span structural models have been derived.The analytic formulae and numerical computing results of seismic response PSD have been derived to study the mechanism of multi-support excitation effects,such as the wave-passage effect and incoherence effect,for the seismic response of multiand large-span structures.By using a multi-span truss as an example,the influence of multi-support excitation effects on the seismic response of such structures is studied. | Zhao Bo Wang Yuanqing Chen Zhihua Shi Yongjiu Jiang Yang Wang Yihong | 2015 | Earthquake Engineering and Engineering Vibration2015，14，3： | 2 |
| 10 | Seismic analysis of high-speed railway irregular bridge–track system considering V-shaped canyon effect显示文摘To explore the effect of canyon topography on the seismic response of railway irregular bridge-track system that crosses a V-shaped canyon, seismic ground motions of the horizontal site and V-shaped canyon site were simulated through theoretical analysis with 12 earthquake records selected from the Pacific Earthquake Engineering Research Center(PEER) Strong Ground Motion Database matching the site condition of the bridge.Nonlinear seismic response analyses of an existing 11-span irregular simply supported railway bridge-track system were performed under the simulated spatially varying ground motions. The effects of the V-shaped canyon topography on the peak ground acceleration at bridge foundations and seismic responses of the bridge-track system were analyzed. Comparisons between the results of horizontal and V-shaped canyon sites show that the top relative displacement between adjacent piers at the junction of the incident side and the back side of the V-shaped site is almost two times that of the horizontal site, which also determines the seismic response of the fastener. The maximum displacement of the fastener occurs in the V-shaped canyon site and is 1.4 times larger than that in the horizontal site. Neglecting the effect of V-shaped canyon leads to the inappropriate assessment of the maximum seismic response of the irregular high-speed railway bridge-track system. Moreover, engineers should focus on the girder end to the left or right of the two fasteners within the distance of track seismic damage. | Zhihui Zhu Yongjiu Tang Zhenning Ba Kun Wang Wei Gong | 2022 | Railway Engineering Science2022，30，1： | 2 |
| 11 | To move or stay?A cellular automata model to predict urban growth in coastal regions amidst rising sea levels显示文摘Low-lying coastal cities are widely acknowledged as the most densely populated places of urban settlement;they are also more vulnerable to risks resulting from intensive land use and land cover change,human activities,global climate change,and the rising sea levels.This study aims to predict how urban growth is affected by sea level rise(SLR)in the Australian context.We develop an urban cellular automata model incorporating urban planning policies as potential drivers or constraints of urban growth under different SLR scenarios and adaption strategies.Drawing on data capturing the socioeconomic and environmental factors in South East Queensland,Australia,our model is positioned to address one core research question:how does SLR affect future urban growth and human resettlement?Results show that urban growth in coastal regions varies depending on the extent to which the sea level rises and is affected by a combination of factors relating to urban planning and human adaptation strategies.Our study demonstrates the complexity of urban growth in coastal regions and the nuanced outcomes under different adaptation strategies in the context of rising sea levels. | Siqin Wang Yan Liu Yongjiu Feng Zhenkun Lei | 2021 | International Journal of Digital Earth2021，14，9： | 2 |
| 12 | Boundary processing technique in EMD method and Hilbert transform 显示文摘 | Deng Yongjiu Wang Wei | 2002 | Science in China2002，46，3： | 1 |
| 13 | Two calculation methods for buckling reduction factors of stainless steel welded I-section beams显示文摘 | Yang Lu Wang Yuanqing Gao Bo Shi Yongjiu Yuan Huanxin | 2014 | Thin-Walled Structures2014，，12： | 1 |
| 14 | Residual stress of 460 MPa high strength steel welded i section: Experimental investigation and modeling显示文摘 | Huiyong Ban Gang Shi Yu Bai Yongjiu Shi Yuanqing Wang | 2013 | International Journal of Steel Structures2013，，4： | 1 |
| 15 | Analysis of seismic behaviors of multi-storey and high-rise steel structures with different layout of braces显示文摘 | Huang Yi Wang Yuanqing Shi Yongjiu | 2008 | Steel Structure2008，38，5： | 1 |
| 16 | An effective dynamic coarse model for optimization design of LTCC RF circuits with aggressive space mapping 显示文摘 | Wu Keli Zhao Yongjiu Wang Jie | 2004 | IEEE Transactions on Microwave Theory and Techniques2004，52，1： | 1 |
| 17 | Experimental and Theoretical Analysis of the Moment-Rotation Behaviour of Stiffened Extended End-Plate Connections显示文摘 | Shi Yongjiu Shi Gang Wang Yuanqing | 2007 | Journal of Constructional Steel Research2007，63，9： | 1 |
| 18 | Numerical Simulation of Steel Pretensioned Bolted End-Plate Connections of Different Types and Details显示文摘 | Shi Gang Shi Yongjiu Wang Yuanqing | 2008 | Engineering Structures2008，30，10： | 1 |
| 19 | Fracture prediction of welded steel connections using traditional fracture mechanics and calibrated micromechanics based models显示文摘 | Wang Yuanqing Zhou Hui Shi Yongjiu | | 0，，03： | 1 |
| 20 | Prelude显示文摘This year we celebrate the 85th anniversary of the Institute of Physics,Chinese Academy of Sciences(CAS).As an academic institution,the publication of a special issue dedicated to demonstrating the range and depth of researches it covers in the | BAI Yin ZHAI JianLei SHI YongJiu WANG YuanQing | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，12： | 1 |
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