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| 1 | Satellite Thermal Infrared Earthquake Precursor to the Wenchuan M_s 8.0 Earthquake in Sichuan,China,and its Analysis on Geo-dynamics显示文摘Based on an interpretation and study of the satellite remote-sensing images of FY-2C thermal infrared 1st wave band(10.3-11.3μm) designed in China,the authors found that there existed obvious and isolated satellite thermal infrared anomalies before the 5.12 Wenchuan M_s 8.0 Earthquake.These anomalies had the following characteristics:(1) The precursor appeared rather early:on March 18, 2008,i.e.,55 days before the earthquake,thermal infrared anomalies began to occur;(2) The anomalies experienced quite many and complex evolutionary stages:the satellite thermal infrared anomalies might be divided into five stages,whose manifestations were somewhat different from each other.The existence of so many anomaly stages was probably observed for the first time in numerous cases of satellite thermal infrared research on earthquakes;(3) Each stage lasted quite a long time,with the longest one spanning 13 days;(4) An evident geothermal anomaly gradient was distributed along the Longmen seismic fracture zone,and such a phenomenon might also be discovered for the first time in satellite thermal infrared earthquake research.This discovery is therefore of great guiding and instructive significance in the study of the earthquake occurrence itself and the trend of the postearthquake phenomena. | WEI Lejun GUO Jianfeng LIU Jianhua LU Zhenquan LI Haibing CAI Hui | 2009 | Acta Geologica Sinica(English Edition)2009，83，4： | 2 |
| 2 | The difference analysis of physical-mechanical properties of sediments in the central South Yellow Sea and Zhe-Min coastal area in China显示文摘The difference analysis of physical-mechanical properties of muddy sediments is made in the central South Yellow Sea and the Zhe-Min(Zhejiang Province to Fujian Province of China) coastal area. The results show that sediments in the two regions are both dominated by mud. There are perfect negative power function correlations between the water content and the density, the compression coefficient and the compression modulus; a good positive power function correlation between the liquid limit and the plastic limit, a perfect positive linear correlation between the water content and the void ratio, and a perfect polynomial function correlation between the miniature vane shear strength and the pocket penetration resistance. In general, compared with sediments in the Zhe-Min coastal area, sediments in the central South Yellow Sea possess high water content, high void ratio,low density, high plasticity, high compressibility, low shear strength. The causes of the differences between physical-mechanical properties of sediments are analyzed from the topographic features, material sources,hydrodynamic conditions, deposition rate, and material composition. Compared with the Zhe-Min coastal area,the central South Yellow Sea is far from the Mainland and low-lying; has poor hydrodynamic condition; the materials diffused to the area are less and dominated by fine clay, have the high content of smectite and organic matters. These factors lead to sediments of the central South Yellow Sea has the higher water content, the higher plasticity, the lower density, and the lower strength than sediments in the Zhe-Min coastal area. | XU Yuanqin LI Ping LI Peiying DU Jun LIU Lejun GAO Wei LIU Jie | 2017 | Acta Oceanologica Sinica2017，36，7： | 1 |
| 3 | Geotechnical properties and stability of the submarine canyon in the northern South China Sea显示文摘The upper part of the continental slope in the northern South China Sea is prone to submarine landslide disasters,especially in submarine canyons.This work studies borehole sediments,discusses geotechnical properties of sediments,and evaluates sediment stability in the study area.The results show that sediment shear strength increases with increasing depth,with good linear correlation.Variations in shear strength of sediments with burial depth have a significantly greater rate of change in the canyon head and middle part than those in the canyon bottom.For sediments at the same burial depth,shear strength gradually increased and then decreased from the head to the bottom of the canyon,and has no obvious correlation with the slope angle of the sampling site.Under static conditions,the critical equilibrium slope angle of the sediments in the middle part of the canyon is 10°to 12°,and the critical slope angle in the head and the bottom of the canyon is 7°.The results indicate that potential landslide hazard areas are mainly distributed in distinct spots or narrow strips on the canyon walls where there are high slope angles. | Jie Liu Lejun Liu Ping Li Shan Gao Wei Gao Yuanqin Xu | 2019 | Acta Oceanologica Sinica2019，38，11： | 1 |
| 4 | Preliminary Study on the Mechanization Demand of Orchards in North China显示文摘From the production management practice of fruit trees in North China by agricultural research institutions,combining the relevant national policies and documents in recent years,the demand for orchard machinery in fruit tree production of North China is summarized,and preliminary thoughts and suggestions are put forward.It could promote the joint of machinery and agriculture(industry,university,research and application departments),and improve mechanization level of orchards in North China. | Lifeng XUAN Shuaike NIU Jianguo WEI Zhan CHEN Dongfeng YANG Shulin WANG Lejun CUI Guanghai WANG Lili YANG | 2022 | Asian Agricultural Research2022，14，8： | 0 |
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