新型全封闭刀口联合式管口封的设计及应用     

韩贻兵  臧启运  徐孝诗 《海岸工程》2003,22(2):92-96

重力活塞取样器是海洋地质调查不可缺少的调查设备，而管口封又是重力活塞取样器的重要部件。管口封的好坏不但影响到取样器的贯入深度和取芯丰，还影响到所取岩芯的质量．介绍了一种最近研制成功的新型全封闭刀口联合式管口封。海上实验在特定海区成功的获取了17．11m的长岩芯，取样率达91．3％，创造了我国海洋地质调查用重力活塞取样器获取岩心的最长记录。该设计已通过国家知识产权局批准授予实用新型专利。  相似文献   

三疣梭子蟹消化酶的初步研究   总被引：8，自引：1，他引：8  

胡毅  潘鲁青 《中国海洋大学学报(自然科学版)》2006,36(4):621-626

开发研制配合饲料,以酶学分析方法研究了温度、pH对三疣梭子蟹(Portunus trituberculatus)中肠腺3种主要消化酶(蛋白酶、淀粉酶和纤维素酶)活性的影响及消化酶(蛋白酶、胰蛋白酶、胰凝乳蛋白酶、羧肽酶A、羧肽酶B、淀粉酶、脂肪酶和纤维素酶)在胃、中肠腺、肠道中的活性分布。结果表明:蛋白酶、淀粉酶、纤维素酶的最适温度分别为55℃,55℃,65℃;蛋白酶、淀粉酶、纤维素酶的最适pH分别为7~8,7.5,4.8;蛋白酶、淀粉酶、纤维素酶在短时间内有很高的热稳定性及很广的酸碱稳定性范围。蛋白酶、胰蛋白酶、羧肽酶A、羧肽酶B活性均以中肠腺最高,胃和肠道中没有测出胰凝乳蛋白酶活性;淀粉酶活性在胃、中肠腺、肠道中差别不大;纤维素酶和脂肪酶活性在胃和肠道高于中肠腺。  相似文献   

温州市绘就水产品发展蓝图     

吴奕 《海洋信息》2001,(3)

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扇贝提取物对实验性高脂血症大鼠血脂及脂质过氧化的影响     

毛文君  李翊  李八方 《海洋科学》2002,26(4):69-71

硒与心血管的结构、功能及其疾病的发生关系密切。世界卫生组织和国际原子能协会已把硒列为与冠心病发病有关的５种元素之一而加以研究。近年来 ,人们逐渐认识到脂质过氧化机理在动脉粥样硬化发生发展中的作用 ,体内血脂代谢异常及氧化损伤是动脉粥样硬化发生发展的重要原因。硒作为自由基清除剂在一定程度上 ,有调节血脂代谢及抗氧化的作用。饮食摄入一定量的硒和体内维持一定水平的硒 ,对防止高脂血症具有积极意义。扇贝提取物是以扇贝为原料提取制备的富含微量元素硒及多种微量元素、维生素和蛋白质等生理活性物质的富硒提取物。本研究利…  相似文献   

Anomalous change of the Antarctic sea ice and global sea level change   总被引：3，自引：0，他引：3  

Xie Simei  Zou Bing  Wang Yi  Bao Chenglan 《海洋学报(英文版)》1996,15(2):193-208

ＡｎｏｍａｌｏｕｓｃｈａｎｇｅｏｆｔｈｅＡｎｔａｒｃｔｉｃｓｅａｉｃｅａｎｄｇｌｏｂａｌｓｅａｌｅｖｅｌｃｈａｎｇｅ￥ＸｉｅＳｉｍｅｉ;ＺｏｕＢｉｎｇ;ＷａｎｇＹｉａｎｄＢａｏＣｈｅｎｇｌａｎ（１．ＮａｔｉｏｎａｌＭａｒｉｎｅＥｎｖｉｒｏｎｍｅｎｔＦ...  相似文献   

Swath mapping of the seafloor and its application to deep-bottom fisheries in New Caledonia     

Patrick Lehodey  René Grandperrin 《Marine Geophysical Researches》1996,18(2-4):449-458

A bottom longline fishery operated in the EEZ of New Caledonia from 1988 to 1991. Fishing focused on five seamounts with summits at depths ranging from 500 to 750 m. The target species was alfonsino, Beryx splendens. As the soundings available from marine charts were not detailed enough, the fishing masters had to make their own charts in order to set the gear in the right location. A series of 11 scientific cruises devoted to a research program on alfonsino was launched in late 1991. During the first scientific cruises, several days were spent mapping the seabed to improve the existing knowledge of the topography of three seamounts by coupling the EDO echosounder depth measurements to the GPS positions. As this procedure is slow, it is applicable to limited areas or, if a wider grid is used, to large zones to locate major structures such as ridges and seamounts. The emergence of the multibeam echosounder has greatly improved seabed mapping performance. This tool seems to fit the requirement of exploratory deep-bottom fishing particularly well, as it covers large areas while providing details of the bottom. The EM 12 was used to obtain bathymetry and imagery of the SE portion of the EEZ of New Caledonia, covering an approximate area of 70,000 km² in two weeks. For depths ranging from 500 to 4,500 m, the results were impressive. They confirmed the known major features and provided greater topographical detail, revealing fine unknown structures. They also provided information on the type of substratum, information which might influence the fishing strategy. Finally, they made it possible to obtain an accurate estimate of the exploitable area which in turn led to new stock estimates.  相似文献   

中国近海的蔓足类 Ⅰ.藤壶属     

任先秋  刘瑞玉 《海洋科学集刊》1978,(13):119-205

藤壶属(Genus Balanus)是甲壳类蔓足亚纲(Subclass Cirripedia)藤壶科(Family Balanidae)中最大的一属，它在有害海洋附着生物中是主要组成成分。许多种附着于船底、水下设施或建筑物上，致使船舰燃料消耗增加，航速减低，降低浮标浮力，缩小管道通路，侵占某些水产养殖对象的有效附着面，污损养殖架筏和绳索，加快水下金属的腐蚀等，对海防、海运交通、工业和渔业常造成一定危害，同人类的关系颇为密切。随着我国科学事业的发展，特别是附着生物防除工作的进展，对于种类的确切鉴定和生物学及生态学资料需要日益增多，只有在搞清种类的基础上，根据不同种的生物学和生态特征，采取相应的措施，才能有效地进行防除工作。 中国近海的藤壶属，国内外仅有一些零星记载，缺乏全面而系统的报告。我们早在五十年代，就注意到我国沿海常见的一些主要附着生物，特别是当时作为“布纹藤壶” Balanus Amphitrite communis Darwin(=B.reticulatus Utinomi)和“克氏藤壶”Balanus Amphitrite krügeri Nilsson-Cantell(=B.uliginosus Utinomi)描记的两个类型，无论在栖息环境、繁殖习性或幼虫形态上都有显著差异，因而怀疑它们不是一个种内的亚种，而应属于不同的种。为了解决上述和类似的问题，给生态和防除研究工作提供更为准确的基本资料，我们对藤壶亚目的种类进行了系统的研究，本文是研究报告的第一部分。根据的是中国科学院海洋研究所历年采集收藏的标本，共鉴定31种和亚种，分隶于7个亚属，其中有6新种，有9种在我国是首次记录(种名录见190页)。新种的模式标本均保存于中国科学院海洋研究所。  相似文献   

Bulk particulate organic carbon in the East China Sea: Tidal influence and bottom transport   总被引：4，自引：0，他引：4  

Zhuo Yi Zhu  Jing Zhang  Ying Wu 《Progress in Oceanography》2006,69(1):37-60

Five oceanographic surveys were carried out in the East China Sea (ECS) and Yellow Sea from 1999 to 2003. In all, seven different sections were surveyed, but one section (the PN section) was observed on every cruise. Two time-series stations were also surveyed, one located at the Changjiang River mouth, the other over the continental shelf in the PN section.We identified biogeochemical characteristics for waters close to the Changjiang Estuary and in the Kuroshio waters (KW), respectively. Resuspension is a strong feature near bottom over the ECS continental shelf, with suspended matter values 13 times higher than that for the surface. A model of particulate organic carbon (POC) dynamics based on a rectangle equation reveals that POC concentration close to the Changjiang Estuary varies with a semidiurnal period of ∼13 h, coinciding with the tidal period. The upper limit for POC residence times in the seasons we covered over the shelf are estimated to be on the order of weeks and generally increase seaward from near the Changjiang Estuary to the KW. Short POC residence times suggest that POC in the ECS is rapidly exported from euphotic waters.A nepheloid layer, observed as elevated suspended matter in near the bottom of the water column, is important in particle transfer over the shelf, especially in winter when the residual current flows mainly eastward. Cross-shelf transport of POC via the nepheloid layer is estimated to be 0.22 × 10¹² g yr⁻¹. Comparison with other work indicates that POC transport is ∼2% of the Changjiang POC input.  相似文献   

潮汐对瞬态气候响应模拟的影响研究     

于溢  刘海龙  林鹏飞  兰健 《海洋学报(英文版)》2020,39(1):52-62

In this study, the impact of oceanic processes on the sensitivity of transient climate change is investigated using two sets of coupled experiments with and without tidal forcing, which are termed Exp_Tide and Exp_Control,respectively. After introducing tidal forcing, the transient climate response(TCR) decreases from 2.32 K to 1.90 K,and the surface air temperature warming at high latitudes decreases by 29%. Large ocean heat uptake efficiency and heat storage can explain the low TCR in Exp_Tide. Approximately 21% more heat is stored in the ocean in Exp_Tide(1.10×10~(24) J) than in Exp_Control(0.91×10~(24) J). Most of the large ocean warming occurs in the upper 1 000 m between 60°S and 60°N, primarily in the Atlantic and Southern Oceans. This ocean warming is closely related to the Atlantic Meridional Overturning Circulation(AMOC). The initial transport at mid-and high latitudes and the decline in the AMOC observed in Exp_Tide are both larger than those observed in Exp_Control. The spatial structures of AMOC are also different with and without tidal forcing in present experiments. The AMOC in Exp_Tide has a large northward extension. We also investigated the relationship between AMOC and TCR suggested by previous studies using the present experiments.  相似文献   

编绘软件网络化的WinSock方法     

姚俊杰  孙毅 《海洋测绘》2004,24(3):55-57

探讨了windows编程环境下，编绘软件的网络实现方法。通过对WinSock编程方法的讨论，表明了编绘软件电子图板实现网络化编辑的可行性。  相似文献