碳同位素质谱法探讨现代海洋有机沉积物来源     

朱桂海  Jame M.Brooks 《海洋学研究》1986,(2)

本文用NUCLIDE RMS 6-60质谱仪测定了长江口及邻近海区(北纬30°06′至31°15′,东经122°30′至124°30′)表层沉积物中有机碳稳定同位素组成(δ~(13)C为-23.6×10~(-3)—-21.3×10~(-3))、有机碳含量(0.4—0.1％),溶剂可提取有机物浓度及有机C/N比值。结果表明,从有机地球化学角度解释并证实了其他地学家在该区域的研完成果,即东海陆架泥质沉积物主要由陆源悬浮物和海洋浮游生物体混合组成,长江入海物质随着远离长江口而递减,大部分陆源悬浮物向东南运移,并沉积在东经123°以西的长江口区。  相似文献   

日平均海面与潮差的关系及其初步动力学解释     

余宙文  叶安乐  陈宗镛 《海洋学报》1984,6(5):561-571

文中对若干个站位上的日平均海面和平均潮差进行了谱分析,发现它们的半月变化成分具有明显的线性关系,在指出可能异致这种线性关系的几种原因的同时,用辐射应力的概念并引进摩擦对其作了初步的动力学分析,表明起因于非线性效应的辐射应力亦是导致日平均潮差半月变化的可能原因之一。  相似文献   

台湾地震地地震活动性的灰色预测     

蔡经球  叶振民 《台湾海峡》1991,10(3):258-263

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Upper temperature tolerances of exotic brackish-water mussel, Mytilopsis leucophaeata (Conrad): an experimental study   总被引：1，自引：0，他引：1  

Rajagopal S  Van der Gaag M  Van der Velde G  Jenner HA 《Marine environmental research》2005,60(4):512-530

The dark false mussel, Mytilopsis leucophaeata is an important mussel colonising the brackish-water systems of temperate and subtropical regions. Of late it has earned notoriety as a biofouling species in industrial cooling water systems. However, there are no published data on the temperature tolerance of this species. This paper presents data on the upper temperature tolerance of this mussel from the view point of biofouling control using thermal methods. In addition to mortality, response of physiological activities such as oxygen consumption, filtration rate, foot activity and byssus thread production were also studied at temperatures varying from 5 to 35 degrees C. Experiments were also carried out to understand the effect of mussel size, breeding condition, nutritional status and acclimation conditions (temperature and salinity) on the mortality pattern. The physiological activities were significantly reduced at temperatures beyond 27.5 degrees C and ceased at 35 degrees C. In 20 mm size group mussels exposed to 37 degrees C, 50% mortality was observed after 85 min and 100% mortality after 113 min. The effect of mussel size on mortality at different temperatures was significant, with the larger size group mussels showing greater resistance. M. leucophaeata collected during the non-breeding season (December-April) were more tolerant to temperature than those collected during the breeding season (June-October). Nutritional status of the mussel had no significant influence on the thermal tolerance of the mussel: fed and starved (non-fed) mussels succumbed to temperature at comparable rates. The effect of acclimation temperature and acclimation salinity on M. leucophaeata mortality at different temperatures was significant. Survival time increased with increasing acclimation temperature and decreased with increasing salinity. In comparison with other co-occurring species such as Mytilus edulis and Dreissena polymorpha, M. leucophaeata appears to be more tolerant to high temperature stress.  相似文献   

气相色谱在海洋有机化学研究中的应用     

朱桂海  叶新荣 《海洋学研究》1990,8(2):74-79

本文简要综述了气相色谱在海洋有机地球化学、环境化学和海洋石油勘探方面的应用,并介绍了近10年来以气相色谱为手段研究海洋化学的部分成果。  相似文献   

青岛太平角和即墨丰城沿海对虾养殖场异养菌群和条件致病菌的研究   总被引：7，自引：0，他引：7  

王文兴  叶孝经  牟敦彩  宋庆云  刘福源  张建中 《海洋科学进展》1983,(2)

前言对虾增养殖事业发展很快,工厂化育苗和成虾养殖技术都取得了显著成果,近年已开始将部分虾苗进行放流.随着对虾养殖事业的发展,致病性微生物对对虾养殖造成的危害受到了人们的注意.如从患病的养殖对虾鳃丝上分离到一种危害对虾的丝状细菌,由于细菌的病害对  相似文献   

Changing anthropogenic influence on the Santa Monica Bay watershed     

Dojiri M  Yamaguchi M  Weisberg SB  Lee HJ 《Marine environmental research》2003,56(1-2):1-14

Santa Monica Bay is an open coastal embayment located directly seaward of Los Angeles, California. The Bay provides vital economic value through its water-dependent activities, such as swimming, diving, boating, and fishing. An increase from 100,000 residents in 1900 to 10 million in 2000 has imposed numerous environmental stressors on the Bay, including urbanization of the watershed. Pollutant discharges into the Bay increased throughout the early part of the century, but declined following passage of the Clean Water Act in 1972. Since that time, the predominant source of pollutant inputs has changed from point sources to non-point urban runoff. To assess how present-day and historical pollution interact to affect the environmental quality of Santa Monica Bay, three organizations collaborated on a multi-disciplinary study in 1997, towards which this volume is focused. This paper details the temporal patterns of anthropogenic influence on Santa Monica Bay to provide context for the papers that follow.  相似文献   

Labour circulation and the village economy in Fiji     

Sofer M 《Singapore journal of tropical geography》1992,13(2):118-129

The author examines circular labor migration in Fiji. "This paper is organized into five sections. The first section provides a brief discussion of two major perspectives of labour circulation in developing countries. The second section presents the state of the Fijian village in the context of the current pattern of uneven development in Fiji. The practice of labour circulation by Fijian villagers is dealt with in the third section. In the last two sections, issues concerning the maintenance of the polarized pattern and the preservation of the village mode of production are discussed."  相似文献   

无需多次扩孔工序的水平定向钻穿越施工     

Sharon  ;M．Bueno  ;楼岱莹译 《岩土钻凿工程》2008,(5):14-15

本文简要介绍了在加拿大安大略省Comuna进行了1条720英尺（219米）无需多次扩孔工序的水平定向钻穿越施工的技术概况。  相似文献   

SVLBI用于大地测量的卫星轨道及其跟踪网设计(英文)     

魏二虎  刘经南  KULKARNI M.N.  FREY Sándor 《地球空间信息科学学报》2008,11(1):6-12

SVLBI （space very long baseline interferometry） has some important potential applications in geodesy and geodynamics, for which one of the most difficult tasks is to precisely determine the orbit of an SVLBI satellite. This work studies several technologies that will possibly be able to determine the orbit of a space VLBI satellite. Then, according to the types and charac- teristics of the satellite and the requirements for geodetic study and the geometry of the GNSS （GPS, GALILEO） satellite to track the space VLBI satellite, the six Keplerian elements of the SVLBI satellite （TEST-SVLBI） are determined. A program is designed to analyze the coverage area of space of different altitudes by the stations of the network, with which the tracking network of TEST-SVLBI is designed. The efficiency of tracking TEST-SVLBI by the network is studied, and the results are presented.  相似文献