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| 1 | Dynamic mechanisms of earthquake-triggered landslides显示文摘Earthquake-triggered landslides usually cause great disasters,and yet their dynamic mechanisms remain poorly understood.This paper will derive a general conceptual landslide model from the geometric and kinematic features of the most landslide masses triggered by the 2008 Wenchuan earthquake.Kinematic characteristics and dynamic processes are simulated here by means of finite element method(FEM)based on the dynamic process of the discontinuous deformable body.The calculated results presented the whole course of landslide motion,and displayed some typical kinematic characteristics such as initiation,sliding,ejection,collision,flying in the air,and climbing of landslides.The simulation result also shows that,under combined seismic inertial forces and gravity,landslides will start to slip once it overcomes the friction between the sliding mass and slip-bed,then it will move from slow to fast along the slippery bed until it ejects from the slip-bed.Moreover,the high frequencies and serious damages by landslides in the Wenchuan earthquake are caused by the strong ground motion on the mountain slopes in and around the epicenter that was dramatically amplified owing to both resonances produced by the seismic event and topographical amplification by seismic motion.In addition,the modeling results suggest that the direction,amplitude,frequency,and duration of strong ground motion have a great influence on the stability of landslide mass.Therefore,the study helps us better understand dynamic mechanism of landslides,seismic hazard assessment,and dynamic earthquake triggering. | ZHU ShouBiao SHI YaoLin LU Ming XIE FuRen | 2013 | Science China Earth Sciences2013，56，10： | 7 |
| 2 | Two selenium tolerant Lysinibacillus sp. strains are capable of reducing selenite to elemental Se efficiently under aerobic conditions显示文摘Microbes play important roles in the transport and transformation of selenium(Se) in the environment, thereby influencing plant resistance to Se and Se accumulation in plant. The objectives are to characterize the bacteria with high Se tolerance and reduction capacity and explore the significance of microbial origins on their Se tolerance, reduction rate and efficiency. Two bacterial strains were isolated from a naturally occurred Se-rich soil at tea orchard in southern Anhui Province, China. The reduction kinetics of selenite was investigated and the reducing product was characterized using scanning electron microscopy and transmission electron microscopy-energy dispersive spectroscopy. The bacteria were identified as Lysinibacillus xylanilyticus and Lysinibacillus macrolides,respectively, using morphological, physiological and molecular methods. The results showed that the minimal inhibitory concentrations(MICs) of selenite for L. xylanilyticus and L. macrolides were 120 and 220 mmol/L, respectively, while MICs of selenate for L.xylanilyticus and L. macrolides were 800 and 700 mmol/L, respectively. Both strains aerobically reduced selenite with an initial concentration of 1.0 mmol/L to elemental Se nanoparticles(SeNPs) completely within 36 hr. Biogenic SeNPs were observed both inside and outside the cells suggesting either an intra-or extracellular reduction process. Our study implied that the microbes from Se-rich environments were more tolerant to Se and generally quicker and more efficient than those from Se-free habitats in the reduction of Se oxyanions. The bacterial strains with high Se reduction capacity and the biological synthesized Se NPs would have potential applications in agriculture, food, environment and medicine. | Ju Zhang Yue Wang Zongyuan Shao Jing Li Shuting Zan Shoubiao Zhou Ruyi Yang | 2019 | Journal of Environmental Sciences2019，31，3： | 7 |
| 3 | The Con temporary Tectonic Strain Rate Field of Continental China Predicted from GPS Measrurements and Its Geodynamics Implications 显示文摘 | Zhu Shoubiao Cai Yonggen Shi Yaoling | 2006 | Pure and Applied Geophysics2006，163，： | 1 |
| 4 | Estimation of GPS Strain Rate and Its Error Analysis in the Chinese Continent显示文摘 | Zhu Shoubiao Shi Yaoling | 2011 | Journal of Asian Earth Sciences2011，40，1： | 1 |
| 5 | Concentrations and characteristics of selenium in soil samples from Dashan Region, a selenium-enriched area in China显示文摘 | Kun Xing Shoubiao Zhou Xiaoguo Wu Yuanyuan Zhu Juanjuan Kong Ting Shao Xu Tao | 2015 | Soil Science and Plant Nutrition2015，，6： | 1 |
| 6 | A finite-element simulation of 2008 Wenchuan earthquake and implications for numerical earthquake prediction显示文摘The dynamic process of the 2008 Wenchuan earthquake is simulated by finite-element method(FEM) ,and the results suggest that we may be able to estimate the occurrence time,location,and magnitude of similar earthquakes in the future.Thus a numerical earthquake prediction(NEP) program is proposed;the reliability of it is dependent on its gradual refinement and the parameters used in the models. | Zhu Shoubiao | 2011 | Geodesy and Geodynamics2011，2，2： | 0 |
| 7 | Diphenylarsinic acid sorption batch experiments and mechanisms in soils using EXAFS spectroscopy显示文摘Diphenylarsinic acid(DPAA)is a phenyl arsenic compound derived from chemical warfare weapons.Macroscopic and microscopic work on DPAA sorption will provide useful information in predicting the partitioning and mobility of DPAA in the soil-water environment.Here,batch experiments and extended X-ray absorption fine structure(EXAFS)spectroscopy were used to investigate the sorption mechanisms of DPAA.The DPAA sorption data from 11 soil types was found to fit the Freundlich equation,and the sorption capacity,Kf,was significantly and positively correlated with oxalateextractable Fe2o3.The Kf values of eight of the 11 untreated soils(1.51113.04)significantly decreased upon removal of amorphous metal(hydr)oxides(0.51-13.37).When both amorphous and crystalline metal(hydr)oxides were removed from the untreated soils,the values either decreased or slightly increased(0.65-3.09).Subsequent removal of soil organic matter from these amorphous and crystalline metal(hydr)oxide-depleted samples led to ftirther decreases in A^f to 0.021.38,with only one exception(Sulfic Aquic-Orthic Halosols).These findings strongly suggest that ligand exchange reactions with amorphous metal(hydr)oxides contribute most to DPAA sorption on soils.EXAFS data provide further evidence that DPAA primarily formed bidentate binuclear(~C)and monodentate mononuclear(1 V)coring-sharing complexes with As-Fe distances of 3.34 and 3.66 A,respectively,on Fe(hydr)oxides.Comparison of these results with earlier studies suggests that 2C and 1 F complexes of DPAA may be favored under low and high surface coverages,respectively,with the formation of 1 V bonds possibly conserving the sorption sites or decreasing the steric hindrance derived from phenyl substituents. | Meng Zhu Yongming Luo Ruyi Yang Shoubiao Zhou Juqin Zhang Mengvun Zhang Peter Christie Elizabeth L.Rylott | 2020 | Frontiers of Environmental Science & Engineering2020，14，4： | 0 |
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