Organochlorine and butyltin residues in deep-sea organisms collected from the western North Pacific,off-Tohoku,Japan   总被引：4，自引：0，他引：4  

de Brito AP  Takahashi S  Ueno D  Iwata H  Tanabe S  Kubodera T 《Marine pollution bulletin》2002,45(1-12):348-361

Organochlorine (OCs) and butyltin (BTs) residues were determined in deep-sea organisms collected from the western North Pacific, off-Tohoku, Japan. Among OCs, concentrations of polychlorinated biphenyls (PCBs) and DDTs (DDTs and its metabolites) were the highest in deep-sea organisms (maximum concentrations of 6700 and 13,000 ng/g lipid wt, respectively). Chlordane compounds (CHLs) were the next most abundant OCs, and hexachlorocyclohexanes (HCHs) and hexachlorobenzene (HCB) were the lowest. BTs were also detected at maximum concentrations of 570 ng/g wet wt. Concentrations of PCBs, CHLs and BTs in deep-sea organisms collected from the western North Pacific, off-Tohoku, were generally lower than those in deep-sea and shallow water organisms from Japanese coastal waters. On the other hand, considerable variations in the concentrations of OCs were found among deep-sea organisms analyzed. Several carnivorous fishes such as snubnosed eel, lanternshark and grenadiers accumulated some OCs such as PCBs, DDTs and CHLs at high concentrations of up to a few μg/g levels. In addition, the residue pattern of OCs and BTs in fishes showed a specific trend according to the sampling depth; higher concentrations of PCBs, DDTs and CHLs and lower concentrations of HCHs, HCB and BTs were found in fishes collected from greater depth (1000 m) compared to those from shallower waters. This trend is consistent with the results of our earlier study on mesopelagic myctophid fishes. Results of this study suggest vertical transport of hydrophobic OCs such as PCBs, DDTs and CHLs and its accumulation in benthic deep-sea organisms.  相似文献   

From Physical Space to Visual Image Space   总被引：1，自引：0，他引：1  

YE Zetian LIN Hui LIU Xianlin YE Zetian  Ph.D  Chinese Academy of Surveying  Mapping  Beitaiping Road  Haidian District  Beijing  China. 《地球空间信息科学学报》2003,6(2):42-47

1　IntroductionVirtualreality (VR)isaformofhuman computerinterface(HCI) [1 ] .Andnowitisamajorbranchofcomputing ,cover ingabroadspectrumofhumaninteractionwithcomputers .Itrangesfromtheinteractionwithrealenvironmentstothatwithsyntheticallygeneratedworlds[2 ] .Usually ,intheinterac tiveprocess ,oneofthemainoutputsofcomputerisgraphicsonthescreen .Thegraphicsarethemaininformationsourcereceivedbyhumanfromthecomputers .Tohuman ,visionisthemostimportantorgantogaininformationfromthenaturalworld .S…  相似文献   

地磁学千年（一）     

D．R．Stem  李永华 《世界地震译丛》2003,(5):1-17

地磁学的历史可以追溯到公元1000年左右磁罗盘在中国的发现。对地球磁场的系统研究始于1600年吉尔伯特(William Gilbert)的De Magnete一书(Gilbert，1600)。此后，哈雷(Edmond Halley)、厍伦(Charles Augustin de Coulomb)、高斯(Carl Fdedrich Gauss)和赛宾(Edward SabinO相继进行了该方面的研究工作。奥斯特(Hans Christian Oersted)和安培(Andre-Made Ampere)磁理论的发现为法拉第(MichaleFaraday)的流体发电机理论奠定了基础。基于赫尔(George Ellery Hale)对太阳黑子磁学的观测，拉莫尔（Joseph Larmor)于1919年提出了通过导电流体对流来维持自身运转的发电机理论，由此形成了日地磁场的现代发电机理论。古地磁研究表明，在遥远的过去，地球的磁极曾经历过数次倒转，这为板块构造理论的创立提供了重要的依据。近代科学太空飞船的观测表明了地球远磁场的复杂性以及太阳系中其他行星、卫星的伴生磁场的存在。  相似文献   

PROPOSAL TO ORGANIZE A WORLD ASSOCIATION FOR SEDIMENT RESEARCH     

Bingnan Lin  Cheng-Lung Chen  D.E.Walling 《国际泥沙研究》2003,18(4)

Sediment Problems·Matter of Global Concern In the twenty-first eentury,humanity will be confronted with three major Problems,namely raPid inerease in PoPulation,shortage of natural resources and Proteetion of the  相似文献   

NUTRIENT LOAD ESTIMATION METHODS FOR RIVERS   总被引：2，自引：0，他引：2  

Huai-en LI. Joseph Hun-Wei LEE  Ming CM Professor  Environmental Science Institute  Xi''''an University of Technology. Xi''''an . Shaanxi  P.R. China.Professor  Department of Civil Engineering  The University of Hong Kong  Pokfulam Road  Hong Kong.P.R. China  Ph.D. student in Hydrology  Water Resources. Environmental Science Institute  Xi''''an University ofTechnology  Xi''''an  Shaanxi  P.R. China 《国际泥沙研究》2003,18(4)

Pollutant load estimation is essential for watershed management and water pollution control. For most watersheds, only sparse water quality measurements (e.g. monthly data) are available. The influence of input data on the accuracy of non-point source pollution load estimation is studied using the water quality and stream flow data from a small watershed in Hong Kong. Comparison and analysis of the results using 8 different methods show that the accuracy of stream-flow runoff is the single most important factor for the calculation of pollutant load. Based on the results, the stream flow correction coefficient is advanced to provide a more reliable load estimation. The improved method of pollutant load estimation can be easily applied in practice since the stream-flow runoff can be measured by hydrological station or estimated with various hydrological methods.  相似文献   

消除对GPS和GLONASS接收机干扰的自适应天线阵     

D.J.Moelker  E.VanderPolEdwin 《GPS天线及其抗干扰技术》2002,(4M):18-31

  相似文献   

2014年地籍——论瑞士地籍的可持续发展     

J.考夫曼  E.加伯勒  T.格勒萨德  D.史帝瓦德勒  麻战红 《国土资源情报》2002,(11)

1.前言 在瑞士,地籍具有悠久而成功的传统。自从1848年制定联邦宪法之后,瑞士各州就开始实施州级土地登记。随着瑞士民法典  相似文献   

南秦岭横丹浊积岩系—晚古生代发育于扬子板块被动陆缘上的弧前盆地充填物   总被引：14，自引：3，他引：14  

闫全人  A.D.Hanson 《地质通报》2002,21(8):495-500

南秦岭横丹浊积岩系是一套巨厚的浊流沉积，以向南或南东倾的单斜构造产出。由下而上，该沉积层序包括深水盆地、深水浊积扇和斜坡水道3个相序。相应地，沉积物粒度变粗，厚度变大，火山质组分含量增加，凝灰层大量发育，表明横丹浊积岩系为活动型浊积岩；其古水流方向为NNW－NNE向，物源区为南侧的碧口火山岩系。另外，横丹浊积岩系内还见石英岩、重结晶大理岩成分的砾石，说明其物源还包括被动陆缘环境的沉积物。相序、组构、沉积特征和物源区综合分析表明，横丹浊积岩系为弧前盆地充填物。构筑这一弧前盆地的动力学机制是洋壳板块向南俯冲于扬子板块被动陆缘之下，时代可能晚于中晚泥盆世。  相似文献   

伽师地震区地壳细结构及发震层的初步研究   总被引：1，自引：0，他引：1  

李松林  W.D.Mooney 《地球物理学报》2002,45(1):76-82,T001,T002

1997年至1998年伽师地区共出现9次震级为6.1-6.8级的强震。在一个非常短的时间间隔内和非常小的地区范围内接连出现这么多次震级非常接近的地震，确定非常罕见。为研究伽师强震区的深部构造背景和孕震机制，本文对伽师地震区的余震观测资料进行了分析处理。利用联合反演技术同时得到了地震震源位置和地震区地壳三维速度结构。余震震中沿一北北东向条带分布，与强震分布的两个条带中的北东向条带位置基本重合。三维反演得到的速度结构结果表明，在地下12km以下存在一条北北东向和一条北北西向的低速条带。上述两低速条带与强震分布的两个条带位置很接近。初步推测，低速条带对应了地壳深部的两条断裂。在我们观测期间，北北东向断理解有微震活动，北北西向断裂相对平静。  相似文献   

南秦岭横丹浊积岩系——晚古生代发育于扬子板块被动陆缘上的弧前盆地充填物     

闫全人  王宗起  A.D.Hanson  P.A.Druschke  王涛  闫臻 《地质通报》2002,(9)

南秦岭横丹浊积岩系是一套巨厚的浊流沉积,以向南或南东倾的单斜构造产出.由下而上,该沉积层序包括深水盆地、深水浊积扇和斜坡水道3个相序.相应地,沉积物粒度变粗,厚度变大,火山质组分含量增加,凝灰层大量发育,表明横丹浊积岩系为活动型浊积岩;其古水流方向为NNW-NNE向,物源区为南侧的碧口火山岩系.另外,横丹浊积岩系内还见石英岩、重结晶大理岩成分的砾石,说明其物源还包括被动陆缘环境的沉积物.相序、组构、沉积特征和物源区综合分析表明,横丹浊积岩系为弧前盆地充填物.构筑这一弧前盆地的动力学机制是洋壳板块向南俯冲于扬子板块被动陆缘之下,时代可能晚于中晚泥盆世.  相似文献