Identification of crude oil and emulsified crude oil based on microwave scattering experiment

The leaked of crude oil will form emulsions of different concentrations in the process of weathering and migration, which poses a serious threat to the marine ecological environment. Synthetic aperture radar (SAR) plays a major role in the observation of the extent of oil spills on the sea surface which is not affected by rain and clouds and has the advantage of day and night monitoring. However, there are some deficiencies in the identification of emulsified crude oil still exist. In this paper, the natural emulsification of crude oil was observed by C-band full-polarization microwave scatterometer, emulsification process of crude oil simulated by manually prepared oil samples with different moisture content was also observed to study the change of the normalized radar cross section (N_(RCS)). The experimental results show that N_(RCS) of emulsified crude oil is higher than that of crude oil, and the higher the emulsification degree is, the higher the N_(RCS) of oil film is. N_(RCS) differences between oil and water (△sigma~0) and damping ratio (D_R) can identify emulsified and non-emulsified crude oil, reflect the change of the degree of oil film emulsification, and in VV polarization is the best

新疆塔里木河流域治理下坂地水库工程近坝区高陡边坡稳定性研究

工作内容主要有：近坝库区滑坡稳定性研究、未来可能破坏模式分析，滑坡在多种不利组合条件作用下的稳定性计算评价、滑坡工程处理措施研究等；坝区高陡边坡变形与稳定性研究，包括高陡边坡形态特征与岸坡结构类型研究；边坡变形的数值模拟研究；边坡稳定性的计算评价；边坡工程处理方法研究；泄水隧洞进出口边坡、引水发电洞进口、地下厂房后高陡边坡变形与稳定性研究，包括这些边坡变形特征与变形破坏模式研究；边坡变形3维数值分析、刚体极限平衡法分析。边坡的地震稳定性研究、地下厂房对高陡边坡变形与稳定性影响的数值计算分析、边坡加固措施研究。在逐渐完善的勘察和现场测试工作基础上，本报告提出的地质依据可以满足高边坡稳定性研究的要求

大连极紫外相干光源

先进光源的发展在前沿科学研究中发挥的作用越来越重要。近十年来,飞速发展的自由电子激光技术为科学家们提供了探索未知世界、发现新科学规律和实现技术变革的重要工具。建成的大连极紫外(EUV)相干光源的运行波段为50~150nm,单脉冲能量大于100μJ,且可提供10-12 s和10-13 s量级的超快激光脉冲,是我国第一台自由电子激光用户装置,并且是国际上唯一运行在极紫外波段的自由电子激光用户装置,在世界范围内为用户提供具有高峰值亮度和超短脉冲的极紫外激光。大连EUV相干光源是由国家自然科学基金委资助、由中国科学院大连化学物理研究所和上海应用物理研究所共同承担的重大科学仪器研制项目,目标是打造一个以先进极紫外光源为核心、主要用于能源基础科学研究的光子科学平台