磷锑钼蓝光度法测定红土镍矿中磷量          下载免费PDF全文

司银奎 《山东国土资源》2012,28(12):52-54

试样经烘干处理后,利用硫酸和氢氟酸溶矿,硝酸提取,加氨水以氢氧化铁为载体沉淀磷酸盐,分离镍、铬、钴、铜等干扰离子,制备成硝酸溶液。中和后,以钼酸铵—酒石酸锑钾为显色剂,以抗坏血酸为还原剂,显色,在700nm处测量吸光度,利用计算机拟合标准曲线计算磷含量。此方法精密度与加标回收率均能满足质量要求。  相似文献   

国土资源信息灾备中心建设的可行性探讨          下载免费PDF全文

杨先连  刘乾忠 《山东国土资源》2013,29(2)

随着国土资源信息化向纵深发展,通过背景分析和现状分析,透过所存在的问题,阐述了国土资源信息灾备中心建设的可行性和重要性,进一步通过需求分析,说明了建设国土资源信息灾备中心必要性,但要考虑其建设的复杂性和长期性,为异地灾备中心建设提供了参考.  相似文献   

Comparing long term sediment records to current biological quality element data - Implications for bioassessment and management of a eutrophic lake     

Tommi Kauppila  Antti Kanninen  Matias ViitasaloJohanna Räsänen  Kristian MeissnerJukka Mattila 《Limnologica》2012,42(1):19-30

Defining reference conditions for lakes situated in areas of human settlement and agriculture is rarely straightforward, and is especially difficult within easily eroding and nutrient rich watersheds. We used diatoms, cyanobaterial akinetes, remains of green algae and chironomid head capsules from sediment samples of Lake Kirmanjärvi, Finland, to assess its deviation from the initial ecological status. These site-specific records of change were compared to current type-specific ecological status assessment. All paleolimnological data indicated deviation from natural conditions and mirrored the current, monitoring-based assessment of “moderate” ecological lake status. However, the sediment data showed that the lake should be re-typified as a naturally eutrophic lake. Sediment records as well as current monitoring data indicated temporary improvement in water quality in response to extensive fish manipulation. Our results suggest that paleolimnological records can be used to derive site-specific reference conditions and that extensive restoration efforts can result in gradual, observable improvements of water quality and ecological status.  相似文献   

地震台站管理效益研究     

王伟  徐学恭  王宝锁  雷生学  李悦  高逊 《东北地震研究》2012,28(4)

从台站规划、建设和改造情况,管理体制、工作方式和运行模式,监测设施、观测设备和观测环境,观测质量与技术支撑,工作生活环境,人员结构共六个方面分析了天津市地震台站的工作现状,指出了其中存在的问题,并给出了对策与建议,为提高地震台站的管理效益进行了有益的探索。  相似文献   

省级地震数据容灾备份技术初探   总被引：1，自引：0，他引：1  

张晨侠  丁广  温岩 《东北地震研究》2012,28(2):79-83

对地震数据容灾备份技术进行了研究,探讨了地震数据容灾备份的重要性及设计方案,及开展此项工作的技术和流程。详细介绍了地震数据容灾备份所需的网络备份技术、数据复制技术、灾难检测技术和系统迁移技术。  相似文献   

An efficient method of noroviruses recovery from oysters and clams     

ZHOU Deqing  MA Liping  ZHAO Feng  YAO Lin  SU Laijin  LI Xinguang 《中国海洋大学学报(英文版)》2013,12(1):85-90

Noroviruses (NoVs) are widespread causes of nonbacterial gastroenteritis. Outbreaks of NoVs caused diseases are commonly ascribed to the consumption of contaminated shellfish. The concentration and RNA extraction of NoVs are crucial steps of detecting NoVs in shellfish. This study aimed to select a simple, rapid and highly efficient recovery method of NoVs detection with real-time RT-PCR. Four methods of recovering GI.3 and GII.4 NoVs from spiked digestive tissues of oysters and clams, respectively, were compared, of them, the method involving proteinase K and PEG 8000 was found the most efficient. With this method, 9.3% and 13.1% of GI.3 and GII.4 NoVs were recovered from oysters and 9.6% and 12.3% of GI.3 and GII.4 NoVs were recovered from clams, respectively. This method was further used to detect NoVs in 84 oysters (Crassostrea gigas) and 86 clams (Ruditapes philippinarum) collected from 10 coastal cities in China from Jan. 2011 to Feb. 2012. The NoVs isolation rates were 10.47% of clams (9/86) and 7.14% of oysters (6/84). All the detected NoVs belonged to genotype GII. The NoVs recovery method selected is efficient for NoVs detection in oysters and clams.  相似文献   

Coral reef recovery status in south Andaman Islands after the bleaching event 2010     

N. Marimuthu  J. Jerald Wilson  N. V. Vinithkumar  R. Kirubagaran 《中国海洋大学学报(英文版)》2013,12(1):91-96

The Andaman and Nicobar Islands are one of the Union Territories of India, located in the eastern part of the Bay of Bengal. In 2010 summer, the increment in sea surface water temperature (up to 34℃) resulted in the bleaching of about 74% to 77% of corals in the South Andaman. During this event, coral species such as Acropora cerealis, A. humilis, Montipora sp., Favia pallida, Diploastrea sp., Goniopora sp. Fungia concinna, Gardineroseries sp., Porites sp., Favites abdita and Lobophyllia robusta were severely affected. This study is to assess the recovery status of the reef ecosystem by estimating the percentage of Live Coral cover, Bleached coral cover, Dead coral with algae, Rubble, Sandy flat, Algal assemblage and other associated organisms. The sedimentation rate (mg cm-2 d-1) and coral coverage (%) were assessed during this study period. The average sedimentation rate was ranged between 0.27 and 0.89 mg cm-2 d-1 . The observed post bleaching recovery of coral cover was 21.1% at Port Blair Bay and 13.29% at Havelock Island. The mortality rate of coral cover due to this bleaching was estimated as 2.05% at Port Blair Bay and 9.82% at Havelock Island. Once the sea water temperature resumed back to the normal condition, most of the corals were found recovered.  相似文献   

苏北盆地油田封存二氧化碳潜力初探   总被引：1，自引：0，他引：1  

汪传胜  田蓉  季峻峰  孙蓓  张婷  胡高明 《高校地质学报》2012,18(2):225-231

油田二氧化碳封存是减少温室气体排放量最有效的途径之一,油藏中封存CO2 主要有构造地层储存、束缚气储存、 溶解储存和矿化储存等四种方式,CO2 在油藏中的地质储存容量采用国际上通用的资源储量金字塔理论来进行潜力评价。 本文通过分析油田CO2 封存机理,结合江苏省苏北盆地的地质和构造条件,对苏北盆地油田进行CO2 封存潜力研究。苏北 盆地油田多为低渗透和含水油藏,在储存CO2 的潜力上,东台坳陷优于盐阜坳陷,次级单元中又以高邮凹陷、金湖凹陷封 存CO2 潜力最大,一系列小型构造单元比较适合于CO2 封存,并有利于后期的保存。在封盖能力上,苏北盆地在垂向上有 明显的两分性,下部上白垩系和古新统盖层相对上部始新统盖层对CO2 封盖性更好。估算得到苏北盆地油田埋存CO2 的理 论储存容量为1.5054×108 t,有效储存容量为0.0828×108 t~0.4421×108 t,表明苏北油田封存CO2 的潜力较大。  相似文献   

HELCOM Baltic Sea Action Plan - A regional programme of measures for the marine environment based on the Ecosystem Approach   总被引：1，自引：0，他引：1  

Hermanni Backer  Juha-Markku Leppänen  Kaj Forsius  Jukka Mehtonen  Minna Pyhälä  Hanna Paulomäki  Tarja Haaranen 《Marine pollution bulletin》2010,60(5):642-649

The Helsinki Commission (HELCOM) Baltic Sea Action Plan, adopted by the coastal countries of the Baltic Sea and the European Community in November 2007, is a regional intergovernmental programme of measures for the protection and management of the marine environment explicitly based on the Ecosystem Approach. The Action Plan is structured around a set of Ecological Objectives used to define indicators and targets, including effect-based nutrient input ceilings, and to monitor implementation. The Action Plan strongly links Baltic marine environmental concerns to important socio-economic fields such as agriculture and fisheries and promotes cross-sectoral tools including marine spatial planning. Due to complementarities with the European Union (EU) Marine Strategy Framework Directive, the Action Plan is in essence a pilot for this process without neglecting the important role of the Russian Federation - the only Baltic coastal country not a member of the EU.  相似文献   

The relative importance of physicochemical factors and crustacean zooplankton as determinants of rotifer density and species distribution in lakes adjacent to the Yangtze River, China   总被引：2，自引：0，他引：2  

Songbo Wang  Ping Xie  Hong Geng 《Limnologica》2010,40(1):1-7

The planktonic community of freshwater Rotifera in 27 subtropical lakes was studied to assess the relative importance of physicochemical factors and crustacean zooplankton as determinants of rotifer density and species distribution. Factor analysis and multiple linear regressions showed that 21.9% and 29.9% of the variance in rotifer density was explained by physicochemical factors and crustaceans, respectively. Larger rotifer density was possible in shallower lakes with higher concentration of inorganic nitrogen and less herbivorous crustaceans such as Sinocalanus dorrii and Daphnia. Redundancy analysis showed that the variances of rotifer species distribution explained by crustaceans and physicochemical factors were 26.9% and 31.0%, respectively. Further analysis demonstrated that the variances explained by pure crustaceans and pure physicochemical factors were 12.5% and 16.6%, respectively. However, these two percentages were not statistically different. Rotifer species distribution was strongly associated with Chl a and Moina micrura. Their coexistence with crustaceans seemed to be determined by their defense against potential predators and competitors.  相似文献