"3S"技术在省际间海域勘界中的应用     

刘振民  李四海  骆静新 《海洋通报》2004,23(1):76-81

结合海域勘界的理论方法,在“3S”技术支持下,以天津、河北勘界为例,探讨了建立省际间海域勘界辅助决策信息系统的基本方法和关键技术。实践证明,利用“3S”技术建立省际间海域勘界辅助决策信息系统是一条可行的途径,“3S”技术是勘界工作的重要辅助决策手段。  相似文献   

SEA AND OCEAN BASINS AS FRAMEWORKS OF HISTORICAL ANALYSIS     

JERRY H. BENTLEY 《Geographical review》1999,89(2):215-224

ABSTRACT. Since the mid-nineteenth century, historians have taken national states as the principal focus of their scholarship. Since the mid-twentieth century, they have increasingly recognized the importance of large-scale historical processes that transcend the boundaries of national states, and they have identified large-scale zones of interaction that help to bring these processes into clear focus. Sea and ocean basins show considerable promise as frameworks for the analysis of some historical processes. They would not serve well as the absolute or definitive categories of historical analysis because their contours and characteristics have changed dramatically over time with shifting relationships between bodies of water and masses of land. But they are especially useful for bringing focus to processes of commercial, biological, and cultural exchange, which have profoundly influenced the development of both individual societies and the world as a whole.  相似文献   

COSMOPOLITICS AND THE MARITIME WORLD CITY*     

CAROLYN CARTIER 《Geographical review》1999,89(2):278-289

ABSTRACT. Cosmopolitanism has emerged as a humanistic perspective to express globalizing societal experiences. What are its geographies? World cities are centers of globalizing processes, and their populations and institutions may share elements of cosmopolitical worldviews. Most world cities have also been ports, yet in the contemporary global imaginary, many world cities are not readily understood as places of maritime activity, historic or contemporary. Disjunctures in perceptions of the coastal city-region reflect changes in the world economy and human experiences in modes of travel. This analysis recovers geographical processes of maritime urban areas as a basis for understanding transhistorical and geographical factors of cosmopolitics in globalizing regions and contemporary intellectual thought.  相似文献   

A ferry making waves: A demonstration project ‘doing’ institutional work in a greening maritime industry     

Svein Gunnar Sjøtun 《Norsk geografisk tidsskrift. Norwegian journal of geography》2019,73(1):16-28

ABSTRACT

The objective of the article is to show how the demonstration project and battery ferry Ampere has contributed to a greening of public ferry procurement in Norway. Building on theories on demonstration projects in transition studies and institutional work, the author argues for a more integrated focus than hitherto on the dynamic interplay of materiality, organization, and discourse in demonstration projects, and how the agency of actor networks and the materiality connected to demonstration projects can affect institutional change accompanying transition processes. This is done by conceptualizing Ampere as a ‘performing project’: a complex of discursive and organizational strategies of framing and lobbying deployed by the actor networks connected to it and its materiality. Methodically, the author draws on semi-structured interviews and document analysis. The results suggest that Ampere’s ‘performance’ has contributed to changes in national and regional ferry procurement practices and been vital for an emerging maritime battery niche.  相似文献   

江苏海域文蛤周年性腺发育的初步研究     

范可章  姚国兴  陈爱华  杨家新  许璞 《海洋科学》2006,30(7):27-32

江苏文蛤(Meretrixmeretrix)属于较为独立的地理种群。为提高江苏文蛤苗种生产能力,于2003年12月到2004年11月在江苏沿海海域的东凌、新港、吕四、大丰等采样点,定期取样,计算文蛤各采样时期的丰满度,并及时测量水温,对性腺进行直接和显微切片观察,以研究其性腺发育特点。观察表明,其发育可分为5个期:形成期、生长期、成熟期、排放期及耗尽期。形成期在3~4月,水温10.5~16.5℃;生长期在4~5月,水温18~20.5℃;成熟期在5~6月,水温24~25℃;放散期在6~8月,水温24~32℃;耗尽期在9月以后,直到11月份,水温从24℃左右下降到10℃左右。水温在10℃以下时,文蛤的生长发育处于停滞状态,从11月持续到第二年的3月初。江苏文蛤性腺发育的时间比辽宁文蛤早1个月左右,比广西文蛤迟1个月左右。  相似文献   

海洋运输网络研究进展与趋势探讨     

方志祥  余红楚  黄守倩 《地球信息科学学报》2018,20(5):554-563

随着经济全球一体化快速发展,国际海运贸易的规模不断扩大,全球海运网络研究成为当前的研究热点领域。该研究是海洋运输、地理信息科学、数学物理、统计科学、复杂网络科学、大数据科学、计算机科学等多学科交叉领域共同关注的研究主题,对国家宏观战略与政策制定具有重要作用。本文总结了海运网络研究数据基础、理论模型和研究方法,包括数学物理统计理论方法,基于复杂网络的分析方法、数据挖掘理论方法等,然后从海运网络运输模式设计与优化,网络结构静动态特征,网络结构和交通流演化机制等角度总结海运网络的研究进展、分析所存在的问题,提出海运网络研究在跨学科跨领域研究方法的交叉、多源异构数据融合分析、理论与实际应用结合等方面的未来研究趋势。  相似文献   

上海外高桥港区停泊船聚类分析与异常检测     

郑海林  胡勤友  杨春  陈金海  梅强 《地球信息科学学报》2018,20(5):640-646

停泊船空间分布规律挖掘,在海事监管、港口管理和航运公司船队管理方面有着重要意义。现有研究主要针对船舶停泊点进行空间聚类以识别码头和锚地,缺乏对码头、锚地内船舶停泊特征分析,及码头和锚地外的异常停船的检测。因此,利用海量船舶自动识别系统（AIS）数据探索船舶停泊规律显得很有必要,且具备可行性。根据海况设定停泊速度阈值和停泊位置变化量阈值,建立停船判定模型。按港区、船型筛选,获取2016年1至11月外高桥港区集装箱船停泊记录。根据类中心点密度和聚类数量,设定邻域半径（ε）和邻域密度（MinPts）,采用密度聚类（DBSCAN）算法对船舶停泊点进行密度聚类,并将聚类结果与外高桥港区码头、锚地分布图进行比较,生成可疑停船列表。对比船舶历史轨迹,明确可疑停船列表中船舶真实停泊记录,筛选出异常停船。研究发现,2016年1至11月外高桥港区船舶异常停泊点位于圆圆沙锚地至吴淞口锚地间的南港水道和江亚南沙锚地附近的南港水道航段。船舶停泊前、后位置变化幅度小,而速度变化幅度大,推测船舶突发故障是其异常停泊的原因。海事主管部门（MSA）可根据船舶水上移动通信业务识别码（MMSI）快速锁定航运公司,加强岸上船舶安全管理。船舶停泊位置和时间能够记录船舶发生故障地点及其持续时间,为船队管理提供重要依据。  相似文献   

高精度距离等比例线法海洋划界模型研究          下载免费PDF全文

彭认灿  董箭  陈轶  郑义东  陈惠荣 《海洋测绘》2009,29(4):14-18

分析表明,目前国内外只对距离等比例线法海洋划界模型作了初步的研究,所建立的模型仍然停留在欧氏平面或地图投影平面上,无法满足海洋划界对分界线点位精度的要求。为改变这种局面,提出并建立了一种全新的基于地球椭球体缓冲区构建技术的高精度距离等比例线法——椭球面距离等比例水线法海洋划界模型。  相似文献   

Maritime clusters in diverse regional contexts: The case of Canada     

David Doloreux  Richard Shearmur 《Marine Policy》2009

This paper presents the main results of a project on Canada's regional clusters in the maritime industry. The objectives of this paper are twofold: firstly, the driving forces and the development processes of the different maritime clusters in Canada are described. Secondly, the role of cluster policy in promoting maritime competitiveness in Canada and the key institutional and geographic barriers that affect their growth and development are discussed. The empirical work consists of analyses and assessment of three clusters in different provinces in Canada: Quebec, Newfoundland and Labrador, and British Columbia.  相似文献   

南海周边国家的海洋划界立法与实践     

李令华 《广东海洋大学学报》2008,28(2):6-11

介绍了南海周边国家根据1982年《联合国海洋法公约》精神颁布的海洋法律,并叙述了这些国家的管辖区域主张以及与海洋划界有关的领海基线和基点等方面的问题。指出:南海周边国家之间若要划出专属经济区和大陆架边界线,包括我国在内的所有周边国家政府都应当修正不适宜的划界主张,并在划界原则、理论和方法上趋向一致,为早日划好边界,促进南海地区的经济发展和和平稳定而努力。  相似文献