The source and distribution of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofurans in sediments of Port Jackson, Australia     

Birch GF  Harrington C  Symons RK  Hunt JW 《Marine pollution bulletin》2007,54(3):295-308

Concentrations of polychlorinated dibenzo-p-dioxins (dioxins)(PCDDs) and polychlorinated dibenzofurans (PCDFs)(furans) in sediments from Port Jackson ranged from 32 to 4352 pg WHO-TEQ DF g(-1)dw with a mean of 712 pg g(-1)dw. Maximum total dioxins plus furans concentrations in this sediment was 6,290,000 pg g(-1)dw, which is the highest recorded in Australia and among the highest reported for sediment globally. Permanent bans were placed on fin fishing and prawn trawling in February, 2006 for the whole estuary, based on dioxin tissue burdens. A distinct congener profile corresponded to chemicals known to have been produced by industry on the shores of Homebush Bay in the upper estuary. These chemicals are being dispersed extensively and exceed pre-anthropogenic concentrations in even distant, less developed parts of the harbour. Remediation of sediments is currently being undertaken, with the intention of containing dispersion of dioxins and reducing body burdens in fin fish and prawn populations.  相似文献   

基于TMS320VC5402的RS_485通信设计     

宋坤  黄浩乾  刘明初  陈熙源 《南京气象学院学报》2011,(5):448-451

完成了基于TMS320VC5402 DSP的RS_485通信的硬件设计和软件编程.基于美国TI公司TMS320VC5402 DSP芯片的多通道缓冲口(McBSP)进行适当的硬件扩展,以SPI方式直接和MAXIM公司的MAX3100通用异步串行收发器接口,然后经Linear Technology公司的LTC1480超低功耗RS_485收发器,从而实现了一种新的基于RS_485标准接口串行通讯的数据传输,充分利用了DSP的片上资源,使硬件和软件结构尽量简单化.  相似文献   

A recent history of metal accumulation in the sediments of Rijeka harbor, Adriatic Sea, Croatia   总被引：2，自引：0，他引：2  

Neven Cukrov  Stanislav Fran?iškovi?-Bilinski 《Marine pollution bulletin》2011,62(1):154-167

We studied metal pollution in the sediments of Rijeka harbor, including anthropogenic influence during recent decades and at the present time. Sediment profiles were collected at ten sampling points. The concentrations of 63 elements in bulk sediment were obtained using ICP-MS, and the concentrations of selected elements were evaluated by statistical factor analyses. We also calculated metal-enrichment factors and geoaccumulation indices and constructed spatial-distribution maps.Mercury (Hg) was the heaviest pollutant, with concentrations exceeding 4 mg/kg. Silver (Ag) was the second most important pollutant, with constantly increasing values. The average concentrations of the most toxic elements were comparable to those found in sediments of other ports throughout the world, and their toxicity ranged from threshold values [chromium (Cr), arsenic (As)] and midrange-effect values [cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni)] to extreme-effect values (Hg). Metal pollution has decreased during recent decades, except for Ag and barium (Ba).  相似文献   

Management strategies to prevent the introduction of non-indigenous aquatic species in response to the Ballast Water Convention in Taiwan     

《Marine Policy》2014

The Convention for ballast water management is approaching the threshold of enforcement. Many countries around the world formulate national laws and regulations to mitigate the hazards of non-indigenous aquatic species (NIAS) brought about by the discharge of ballast water from ships. Taiwan’s critical location as an important transportation hub in the Western Pacific Ocean makes it a hot spot for the invasion of NIAS. Therefore, devising strategies for the management of ballast water is urgently needed. This study explores the global trend in ballast water management, and discusses the possible strategies which Taiwan may adopt in response to the Ballast Water Convention, from the perspective of Taiwan’s stakeholders in relation to the ballast water issue. Some of the proper actions that Taiwan should take in the future regarding the management of ballast water include: delineating the area for ballast water exchange, establishing the ballast water declaration system for incoming vessels, assisting shipping companies in installing ballast water treatment systems, determining risk priority for incoming vessels, and inspecting ballast water-related parameters by means of port state control (PSC). In this way, the invasion of NIAS may then be prevented in compliance with the global standards.  相似文献   

大连港、营口港与腹地经济协同发展比较分析     

董晓菲  韩增林  荣宏庆 《地域研究与开发》2014,(5)

以辽宁港口群内大连港与营口港为研究对象,选择2000—2010年港口与腹地经济协同度为切入点,测度两港的发展水平并分析未来发展态势。大连港、营口港与腹地经济协同度虽然略有差异,但总体上均呈现逐年提升的态势;两港与腹地经济高协同区域由沈大交通线向沿海地区转移;大连港与腹地经济中心沈阳市的协同度高于营口港;营口港与腹地经济协同度有提升态势,大连港、营口港与沈阳市的经济协同度相对于其他地级市出现逐年弱化现象。进一步探究双港驱动腹地经济协同发展的内部机制,发现在不同阶段自然条件与区位条件展开博弈;出现由市场需求和地方政府共同推动的主导港地位之争;港口与腹地经济的协同度受腹地中心城市的影响较大;外部环境及地方政策导向作用明显。  相似文献   

岚山港海洋临时倾倒区表层沉积物重金属污染、潜在生态风险评价及变化趋势分析   总被引：3，自引：0，他引：3  

张亮  曹丛华  任荣珠  孙滨  宿凯  林森  屈文 《海洋通报》2011,30(2):235-239

根据2009年9月岚山港海洋临时倾倒区海域表层沉积物重金属监测数据,采用Hakanson生态风险指数法对其重金属污染特征,潜在生态风险性进行了评价,并对其变化趋势进行了分析,结果表明:该倾倒区海域重金属综合污染程度和潜在生态风险性均较低,倾倒区主要潜在生态风险因子为Cd和Hg.潜在生态风险指数(ERI)表明该倾倒区的生...  相似文献   

大连现代港口物流发展分析     

冯凯  韩增林  晋培育 《云南地理环境研究》2011,23(1):81-85

港口物流业是高附加值、低能耗、低排放的产业。世界经济全球化、宏观经济形势变化,以及辽宁沿海经济带发展规划上升为国家战略,给大连发展现代港口物流业带来了难得的历史机遇。论文阐述了现代港口物流的内涵,分析了大连发展现代港口物流业的优势和现状,提出了整合港口资源,构建现代信息平台,加强港腹互动,大力培养现代港口物流人才的发展策略。  相似文献   

Between the Centre and the Periphery: the development of port trade in Darwin,Australia     

Jiaping Wu 《The Australian geographer》2011,42(3):273-288

Darwin, the capital of the Northern Territory, is a port city located in Australia's Top End and facing Southeast Asia. The distance from Darwin to Australia's main economic centres of Sydney and Melbourne is almost the same as to Singapore. This central geographical location has inspired the development of the Port and the City of Darwin from time to time while being held back by its remoteness, and especially the lack of an efficient railway link to Australia's major southern centres. The Port of Darwin has been redeveloped with the vision of repositioning the City of Darwin as Australia's gateway to Asia which it was expected to achieve with the completion of the transcontinental railway link from Adelaide to Darwin. This paper analyses trade and cargo movements for the Port of Darwin between 2000 and 2009—5 years for each period before and after the availability of intermodal transport—and examines the processes by which transformation of the gateway is actually occurring. The evidence to date, however, suggests that the landbridge development has had little material effect in terms of trans-shipments and throughputs for the Port of Darwin. The volume of container trade and interstate export and import cargo that passes through the port has in fact declined since the availability of the transcontinental railway in 2005.  相似文献   

Real-time assessment framework of spatial liquefaction hazard in port areas considering site-specific seismic response     

《Computers and Geotechnics》2014

This paper proposes a systematic framework for real-time assessment of spatial liquefaction hazard of port areas considering local seismic response characteristics based on a geographic information system (GIS) platform. The framework is integrated and embedded with sequential, interrelated subprocedures and a database for liquefaction-induced damage evaluation that standardizes and both individually and collectively quantifies analytical results. To integrate the current in situ condition of a selected port area, the framework functions as a spatial database system for geotechnical and structural data and as a recipient of automatic transmission of seismic monitoring data. The geotechnical profile correlated with liquefaction potential is compiled into a geotechnical spatial grid built by geostatistical methods. Linked with the geotechnical spatial grid, the processing of site-specific responses is automatically interpreted from previously derived correlations between rock acceleration and maximum acceleration of each soil layer. As a result, the liquefaction severity is determined based on a combined geotechnical spatial grid with seismic load correlation in real-time according to a simplified procedure, allowing calculation of the liquefaction potential index (LPI). To demonstrate practical applications of the framework in estimating the liquefaction hazard in real-time, liquefaction-hazard maps were visualized for two earthquake scenarios, verifying the applicability of the proposed framework.  相似文献   

批判地缘政治视角下的国家品牌实践——以海南自由贸易港为例     

罗志伟  王敏 《热带地理》2022,42(7):1169-1179

当前世界地缘政治经济格局发生深刻变化,全球化发展正面临重大挑战。在此背景下,建设海南自由贸易港既是中国深化改革开放的需要,也是在全球治理语境下中国积极重塑地缘政治经济格局的重要举措。以海南自贸港为对象,采用话语分析和网络民族志方法,探讨基于国家品牌的地缘政治实践,审视政府、媒体和国内外普通受众如何参与海南自贸港地理意义的（再）生产,并讨论了其背后的地缘政治运作机制。研究发现,国家品牌建设涉及国家、媒体和普通受众之间的互动,政府利用媒体工具构建宏大叙事,塑造国内外受众对海南自贸港的地理想象,进而支持和强化中国作为全球治理的建设者身份。然而,不同社会文化背景的受众群体形成了差异化的情感体验,普通受众对海南自贸港的认同等积极感知支持了国家身份叙事,质疑和感到威胁等情感则对自上而下和由内而外的话语营建提出挑战。不同行动者的建构和表征作用使国家品牌意义不断被想象、表达和重塑,导致基于国家品牌的地缘政治运作复杂化。  相似文献