CONVERSION RATES OF SURFACE HOX RADICALS IN BEIJING CITY     

REN Xin-rong    WANG Li-xin  WANG Hui-xiang  MIAO Guo-fang 《中国地理科学(英文版)》2004,14(1):34-38

1INTRODUCTIONThe hydroxyl radicals play a central role in atmospher-ic photochemistry, reacting with a lot of compounds, often initiating their oxidation and subsequent loss and resulting in the formation of ozone and other deleteri-ous oxidants, acids, and fine particles in polluted ar-eas. A thorough understanding of this role is necessary for efficient, cost-effective pollution control. There-fore, the measurement of OH is very significant (E-HHAT etal., 1991). Nevertheless, most me…  相似文献   

金矿勘查中用于解释IP数据的某些准定时方法     

Eaton  PA 高平 《物探化探译丛》1997,(A02):49-54

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贵州岩溶地区水库渗漏及地下水开发利用问题     

高平 《贵州地质》1984,(1)

岩溶地下水可分为三层:上层垂向渗灌,中层横向流动,下层是承压水比较静止,水库渗漏和地下水开发利用是中层。研究勘探中层,避免渗漏,必要时进行防渗工程措施是行之有效的。地下水的开发利用,应采取拦、蓄、引三位一体的方案为上策,是为子孙万代的永久之计;“提”要因地制宜,要有节制的,要算水账,要统一规划部署。不要密集的打井,不要大量吸取地下水,不要长期的超过了它的补给来源,以致逐步降低了大面积的地下水位,后果是重要的。  相似文献   

大自然的橙色诱惑--矿物晶体姓氏的秘密     

高平 《地球》2022,(1):73-79

说到橙色,您最先想到的是什么?蜜汁流淌的甜橙?冰爽可口的芬达?变幻多彩的落日余晖?路边热热闹闹盛开的萱草花?抑或是火灾现场消防员身上蹭满烟尘的一袭鲜明戎装?如果你知道初学英语时,最先学会的水果orange一词并不是橙子专属,而是源于东方;橙色矿物和植物那靓丽身影背后会暗藏凶险;您是否会心怀忌惮、疑窦丛生?  相似文献   

我国部分世界地质公园的旅游现状和发展建议     

张翼翼  高平  曹闻闻  张焕香  刘微微  李小英  汪茂 《地质论评》2013,59(Z1):1213-1214

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南堡凹陷北部东营组同沉积断裂对沉积体系及岩性圈闭的控制作用     

康海亮  林畅松  刘晓  高平 《现代地质》2016,30(2):286-293

同沉积断裂对断陷湖盆层序格架内沉积体系类型及发育分布具有重要的控制作用,也影响了岩性圈闭的发育,已成为当前石油地质领域研究的热点。以层序地层学理论为指导,综合南堡凹陷地震、测井、岩心等资料进行分析,研究认为其北部老爷庙、杜林和高南地区东营组为一个完整的二级层序,内部可划分为4个三级层序。受边界同沉积陡断裂、古地貌、物源供给及凹陷内同沉积断裂等因素影响,主要发育3种沉积体系组合样式及其相应的岩性圈闭类型：在西南庄边界断裂控制下,受物源供给和古地貌影响,老爷庙地区发育单断陡坡扇三角洲-湖底扇型,控制了砂岩透镜体圈闭的发育;杜林地区发育单断陡坡近岸水下扇-浊积扇型,此类型内岩性上倾尖灭圈闭发育;受柏各庄边界断裂和高柳同沉积断裂控制,高南地区发育多断阶扇三角洲前缘加厚型,易形成前缘分流河道砂和滑塌浊积扇砂体形成的岩性圈闭。  相似文献   

Assessment of perfluorinated compounds (PFCs) in plasma of bottlenose dolphins from two southeast US estuarine areas: relationship with age, sex and geographic locations     

Fair PA  Houde M  Hulsey TC  Bossart GD  Adams J  Balthis L  Muir DC 《Marine pollution bulletin》2012,64(1):66-74

Plasma PFCs were measured in 157 bottlenose dolphins (Tursiops truncatus) sampled from two US southeast Atlantic sites (Charleston (CHS), SC and Indian River Lagoon (IRL), FL) during 2003-2005. ∑PFCs, perfluoroalkyl carboxylates (∑PFCAs), perfluoroalkyl sulfonates (∑PFSAs) and individual compounds were significantly higher in CHS dolphins for all age/sex categories compared to IRL dolphins. Highest ∑PFCs concentrations occurred in CHS juvenile dolphins (2340 ng/g w.w.); significantly higher than found in adults (1570 ng/g w.w. males; 1330 ng/g w.w. females). ∑PFCAs were much greater in CHS dolphins (≈ 21%) compared to IRL dolphins (≈ 7%); ∑PFSAs were 79% in CHS dolphins versus 93% in IRL dolphins. PFOS, the dominant compound, averaged 72% and 84%, respectively, in CHS and IRL dolphins. Decreasing PFC levels occurred with age on the bioaccumulation of PFCs in both sites. These observations suggest PFC accumulation in these two dolphin populations are influenced by site-specific exposures with significantly higher levels in CHS dolphins.  相似文献   

The Sea Empress oil spill (Wales, UK): effects on Common Scoter Melanitta nigra in Carmarthen Bay and status ten years later     

Banks AN  Sanderson WG  Hughes B  Cranswick PA  Smith LE  Whitehead S  Musgrove AJ  Haycock B  Fairney NP 《Marine pollution bulletin》2008,56(5):895-902

Carmarthen Bay, UK, regularly supports internationally important numbers (>16,000) of non-breeding Common Scoters Melanitta nigra. The spill of 72,000 tonnes of crude oil from the Sea Empress in 1996 affected birds both through direct mortality and likely pollution of key food resources. Numbers were greatly reduced following the spill, whilst changes in the distribution of birds within Carmarthen Bay suggested that potentially sub-optimal foraging zones were used. However, ten years after the incident, numbers of Common Scoter were no different to those recorded immediately before the spill. Compared to some other spills, rapid revival is evident. Numbers increased to pre-spill levels within three winters and distributional changes suggested a concurrent return to previously contaminated feeding areas, implying that the ecosystem had regenerated sufficiently to support its top predator. The importance of prolonged, standardised monitoring of bird numbers and distribution as indicators of ecological recovery from environmental damage is emphasised.  相似文献   

大自然的金色变奏——矿物因境而变的秘密     

高平 《地球》2022,(5):75-80

<正>由于诸多社会文化因素的叠加,金黄被赋予了多种含义,单独讲黄色似乎有些局限,讲金色更宏阔一些。但作为色彩三元色的黄色,其在色彩学中的地位却是能量满满,因为我们的眼睛对黄色光波更加敏感,所以观察到黄色时,会觉得比其他任何颜色都要鲜艳夺目,又因为黄色是与金属质感关联度最高的颜色,因此它的色彩价值更是万众瞩目。明亮,如国旗上鲜艳的五角星;奢华,如金碧辉煌的宫殿;警醒,如抗疫战场的两米线……。  相似文献   

超新星1993J4月15日光谱的模型拟合     

章庆 Mazz.  PA 《天体物理学报》1995,15(3):228-232

本利用蒙特卡罗光谱合成方法，对１９９３年由哈勃空间望远镜和里克天台同时得到的超新星１９９３Ｊ的紫外及光学波段的光谱，进行研究并将拟合的结果与别人的模型进行了比较。假设太阳丰度及幂律为２０左右的大气密度结构，模型可以与观测较好地符合。通过计算得到光球速度为９５００ｋｍｓ＾－１左右，光谱的黑体温度为７９９０Ｋ。对于强线如Ｈα及ＨｅＩλ５８７６的特殊谱线轮廓，我们发现大气结构需要是双幂律的，即光球外  相似文献