嵩县黄庄—汝阳三屯熊耳群火山岩古火山机构地质特征

嵩县黄庄—汝阳三屯一带熊耳群火山岩分布区属构造变动强烈的中深剥蚀区。依据岩石岩相标志、断裂构造形迹、火山岩区的产状以及地貌标志等，区内首次识别出了活动于鸡蛋坪期、马家河期的五个古火山口和一个古裂隙喷发带，并对许山期的火山活动特征进行了分析。熊耳群火山活动的早期为北西向的裂隙喷溢；中期以中心式喷发为主，并伴有裂隙式喷发；晚期演化为中心式喷发。区域火山活动表现为自北东向南西由早到晚     

3D Anisotropic P- and S-Mode Wavefields Separation in 3D Elastic Reverse-Time Migration

Surveys in Geophysics - In 2D anisotropic media, non-stationary filters and low-rank approximation methods are classical strategies to compute the decomposition operators, but they suffer from...     

Erratum to: Understanding and building upon pioneering work of Nobel Prize in Physics 2021 laureates Syukuro Manabe and Klaus Hasselmann: From greenhouse effect to Earth system science and beyond

Science China Earth Sciences -     

洗砂泥浆压滤脱水性能及快速检测方法

工程渣土在水洗砂过程中产生的洗砂泥浆存在脱水效果差、不稳定的问题,这与泥浆的脱水性能密切相关。通过模拟现场洗砂工艺获得不同脱水性能的洗砂泥浆,开展了改进滤失试验及模拟压滤试验,研究了洗砂泥浆脱水性能受洗砂工艺的影响规律,获得了一种能够快速表征泥浆脱水性能的指标,用以指导优化渣土洗砂工艺。结果表明：洗砂泥浆脱水性能受洗砂粒径和加水量影响明显,滤失量及渗透系数与脱水性能有较好的相关关系;而30 min滤失量与最终滤失量、最终泥饼含水率呈现较好的相关性,能够较准确地反映泥浆脱水性能;经模拟压滤试验进一步验证,30 min滤失量可以作为洗砂泥浆脱水性能的快速表征指标。基于此提出了一套洗砂泥浆脱水性能的快速检测及工程渣土洗砂工艺优化方法,能够及时为洗砂工艺参数调整提供指导,以获得脱水性能较优的洗砂泥浆,最终使脱水效果得以改善和稳定。     

2018年湖南省农村自然灾害社会脆弱性测度

农村社会发展状况与自然灾害发生频率和强度息息相关,提高农村自然灾害社会脆弱性对农村社会发展及实现乡村振兴战略具有重要作用。以湖南省各地级市州农村为研究对象,从敏感性和恢复力两个维度建立社会脆弱性指标评价体系,采用熵值法、模糊综合评价法和函数法测算敏感性、恢复力和脆弱性指数,分析2018年湖南省农村自然灾害社会脆弱性。结果表明,湖南省农村社会脆弱性空间分异特征明显,呈现“东低西高”的分布格局;多数地区的农村社会脆弱性处于低位水平,地区分异显著,具有两极分化分布特点,张家界地区最高,长沙和衡阳地区最低。在中低社会脆弱性的农村,恢复力指数对社会脆弱性贡献最大,其中最为显著的便是社会公共事业的建设水平和基础设施的完善水平。在高社会脆弱性的农村,敏感性指数对社会脆弱性贡献度最大。     

Data processing and initial results from the CE-3 Extreme Ultraviolet Camera

The Extreme Ultraviolet Camera(EUVC) onboard the Chang'e-3(CE-3)lander is used to observe the structure and dynamics of Earth's plasmasphere from the Moon. By detecting the resonance line emission of helium ions(He+) at 30.4 nm, the EUVC images the entire plasmasphere with a time resolution of 10 min and a spatial resolution of about 0.1 Earth radius(RE) in a single frame. We first present details about the data processing from EUVC and the data acquisition in the commissioning phase, and then report some initial results, which reflect the basic features of the plasmasphere well. The photon count and emission intensity of EUVC are consistent with previous observations and models, which indicate that the EUVC works normally and can provide high quality data for future studies.     

基于时间序列法的北京市需水量预报(英文)

It is essential to establish the water resources exploitation and utilization planning,which is mainly based on recognizing and forecasting the water consumed structure rationally and scientifically.During the past 30 years(1980-2009),mean annual precipitation and total water resource of Beijing have decreased by 6.89% and 31.37% compared with those perennial values,respectively,while total water consumption during the same period reached pinnacle historically.Accordingly,it is of great significance for the harmony between socio-economic development and environmental development.Based on analyzing total water consumption,agricultural,industrial,domestic and environmental water consumption,and evolution of water consumed structure,further driving forces of evolution of total water consumption and water consumed structure are revealed systematically.Prediction and discussion are achieved for evolution of total water consumption,water consumed structure,and supply-demand situation of water resource in the near future of Beijing using Time Series Forecasting Method.The purpose of the endeavor of this paper is to provide scientific basis for the harmonious development between socio-economy and water resources,for the establishment of rational strategic planning of water resources,and for the social sustainable development of Beijing with scientific bases.     

Tectonics of the offshore Red River Fault recorded in the junction of the Yinggehai and Qiongdongnan Basins

Science China Earth Sciences - The Red River Fault, which originated from the southeastern margin of the Tibetan Plateau, has a great significance for obtaining a further understanding of the...