The distribution and sources of polycyclic aromatic hydrocarbons in Narragansett Bay surface sediments

Polycyclic aromatic hydrocarbons (PAHs) were measured in 41 surface sediments from Narragansett Bay, RI. All the analytes generally decrease down bay from the Seekonk, Providence and Taunton Rivers at the head of the bay. Total PAHs ranged from 0.569 to 216 microg/g with 27% exceeding the effects range median (ERM) of 44.8 microg/g and 73% of the stations exceeding the effects range low (ERL) of 4.02 microg/g (Long et al., 1995). Based on principal component analysis, the major source of the contaminants in Narragansett Bay was the Providence River while the coves and Taunton River/Mt. Hope Bay appeared to only have a limited influence on the open bay. PAH source ratios indicate that creosote and/or coal may be the most significant contributor of pyrogenic high molecular weight PAHs in Narragansett Bay, along with significant contributions from diesel exhaust.     

法国防雷工作现状及启示

介绍了法国雷电监测预警系统AMEO 340和防雷业务管理工作,并借鉴其经验,从做好雷电灾害调查与评估和雷电灾害区划,规划建设雷电灾害监测预警平台和预报平台,实现全省雷电业务集约化发展,开展雷电科学技术研究,建立雷电灾害应急处置机制等方面,探讨如何做好防雷业务工作。     

河南省气象台站综合改善面临的问题及对策

国民经济的迅速发展,不仅使各行各业以及人民生活对气象服务提出更高的要求,而且也推动了气象业务现代化建设,拓宽了气象服务领域,提高了服务水平.     

卡鲁溢流玄武岩由地幔羽—岩石圈混合作用形成的Re—Os同位素证据

大量证据表明大陆溢流玄武岩省与地幔羽活动有关。然而，溢流玄武岩所具有的放射性同位素特征往往超出了地幔羽源区（如海岛玄武岩所证实的）范围。这些特征较易解释为大陆岩石圈源于将温度较低的，难熔的地幔岩石圈贡献了富集同位素的（低＾１４３Ｎｄ／＾１４４Ｎｄ）物质。然而，对于将温度较低的，难熔的地幔岩石圈作为玄武质岩浆的一个重要源区的模式有不少反对意见。关于玄武岩的成因，Ｒｅ－Ｏｓ体系可以对地幔羽和大陆下岩石