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氧化型染发剂中12种风险组分的加速溶剂萃取-气相色谱质谱-内标测定法 被引量:4
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作者 崔仲义 郭茹 +3 位作者 杨晓凌 李月红 周斌 陈冰 《职业与健康》 CAS 2020年第5期601-603,共3页
目的开发氧化型染发剂中12种风险组分的加速溶剂萃取-气相色谱质谱(GC-MS)-内标测定法,研究样品加速溶剂萃取最佳操作条件。方法样品加入石英砂、亚硫酸钠、硅酸镁混合后,使用乙酸乙酯溶剂,在压力10.0 MPa,温度100℃下,静态萃取5 min,循... 目的开发氧化型染发剂中12种风险组分的加速溶剂萃取-气相色谱质谱(GC-MS)-内标测定法,研究样品加速溶剂萃取最佳操作条件。方法样品加入石英砂、亚硫酸钠、硅酸镁混合后,使用乙酸乙酯溶剂,在压力10.0 MPa,温度100℃下,静态萃取5 min,循环1次。萃取结束后氮吹浓缩,定容过滤后供GC-MS测定,内标法定量。结果样品在1.0~100.0μg/mL浓度范围内线性关系良好,相关系数r=0.9920~0.9996;最低检出浓度0.08~0.40 mg/kg;平均回收率为81.0%~101.5%;相对标准偏差(RSD)在1.95%~6.27%之间。结论该方法分析简单、快速、准确,可用于氧化型染发剂风险组分检测。 展开更多
关键词 气相色谱-质谱 染发剂 加速溶剂萃取 风险组分
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Climate Change Risk Research: A Case Study on Flood Disaster Risk in China 被引量:4
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作者 WU Shao-Hong PAN Tao HE Shan-Feng 《Advances in Climate Change Research》 SCIE 2012年第2期92-98,共7页
This paper discusses theories and methods of climate change risk studies for the research expansion in China. Climate change risks consist of three basic components including sensitivity, exposure, and possibility. Un... This paper discusses theories and methods of climate change risk studies for the research expansion in China. Climate change risks consist of three basic components including sensitivity, exposure, and possibility. Uncertainty, future events, damages, and relativity are the major features of climate change risk. Climate change risk research includes two key steps: risk assessment and risk management, the former is the process, and the latter is the ultimate goal which is the basis for actions to address climate change. We present the main framework and methods for climate change risk research. A case study on China's floods risk is taken as an example of climate change risk study. Finally, we point out main aspects of climate change risk research, including ensemble-based probabilistic projection, quantitative risk assessment, risk zoning and mapping, and risk management. 展开更多
关键词 climate change risk assessment risk management UNCERTAINTY
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THE COMPOUND BINOMIAL MODEL WITH A CONSTANT DIVIDEND BARRIER AND PERIODICALLY PAID DIVIDENDS 被引量:4
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作者 Jiyang TAN Xiangqun YANG 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2012年第1期167-177,共11页
Consider the compound binomial risk model with interest on the surplus under a constant dividend barrier and periodically paying dividends. A system of integral equations for the arbitrary moments of the sum of the di... Consider the compound binomial risk model with interest on the surplus under a constant dividend barrier and periodically paying dividends. A system of integral equations for the arbitrary moments of the sum of the discounted dividend payments until ruin is derived. Moreover, under a very relaxed condition, the solutions for arbitrary moments are obtained by setting up iteration processes because of a special property of the system of integral equations. 展开更多
关键词 Compound binomial risk model constant dividend barrier dividend period expected discounted dividends.
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