Excursion to Ilford and visit to Sir Antonio Brady's Museum,June 17th, 1871     

Henry Woodward  Antonio Brady 《Proceedings of the Geologists' Association. Geologists' Association》1872,2(7):273-274

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Sobre un volcán de Verita recientemente descubierto en el Mioceno de Barqueros. — (Murcia)     

M. San Miguel de la Cámara  Antonio Almela  YJ. M. Fúster Casas 《Bulletin of Volcanology》1952,12(1):165-182

While working to construct a geological map. A.Almela, an Engineer of Mines, discovered in Alhama de Murcia a previously unknown volcanic crater. This volcano erupted through the miocene layers and extended above them, thus establishing the date of this eruption as being post-miocene. Since there are no sedimentary rocks in this region of a more recent date it is impossible to fix the date of the eruption any more exactly. The crater is about 1Km. In the surface of the crater one finds slag, scoriaceous lava and compact rocks. The rock is composed of phlogopite, olivine and diopside in phenocrysts in a hyaloid cement with tiny grains of sanidine, olivine and diopside; and a thin layer of phlogopite in a glassy brownish black. A study was made of the chemical constituency of the rocks on the basis of three complete analyses and a comparison was made with the findings already made by Vera-Garrucha and those of Fortuna. All of the data as compiled in the five tables and four diagrams graphically represents the obtained results. The volcanic rocks have a close analogy to those ofOsann’s « Verita » type, which are shown not only by the analytical value of the magmatic parameters but also by the positions of the points shown in diagramsK-mg andLs-Fs-Ks of the three types already analized. In all the samples which have been studied from Barqueros the value of the K₂O is superior to that of Na₂O; it is also greater than that of Vera-Garrucha and less than in that of Fortuna.  相似文献   

抓住奥运机遇,加快青岛海洋旅游开发研究   总被引：4，自引：0，他引：4  

董玉明  盛红  陈娟 《海岸工程》2003,22(1):91-94

青岛市作为2008年北京奥运会唯一的伙伴城市，将给青岛海洋旅游开发提供难得的机遇，产生重大而积极的影响。为了加快青岛海洋旅游开发的进程，尽快与国际海洋旅游接轨，必须抓住这一机遇，采取应对措施。  相似文献   

Underwater Acoustic Communication Based on Pattern Time Delay Shift Coding Scheme   总被引：1，自引：0，他引：1  

殷敬伟  惠俊英惠娟姚直象  王逸林 《中国海洋工程》2006,20(3):499-508

1 .Introduction Underwater acoustic (UWA) communicationis a fast developingfield,and its applicationis notlimitedto military affairs ,but is also extendinginto commercial fields .Catipovic (1990) ,Stojanovic(1996) and Kilfoyle and Baggeroer (2000) pointed…  相似文献   

Effects of mining wastes on a seagrass ecosystem: metal accumulation and bioavailability, seagrass dynamics and associated community structure   总被引：1，自引：0，他引：1  

Marín-Guirao L  Atucha AM  Barba JL  López EM  Fernández AJ 《Marine environmental research》2005,60(3):317-337

Two different Cymodocea nodosa (Ucria) Ascherson beds growing in mining-contaminated sediments were compared with two reference beds in the Mar Menor coastal lagoon. The accumulation of Zn, Pb and Cd in different fractions of the plant, the sediment parameters that regulate the availability of metals, the seabed structure and dynamics of each seagrass bed and its associated macroinvertebrate community were studied. C. nodosa accumulates metals from the sediments and reflects their bioavailability for this seagrass. At each station, the metal content of the rhizomes was lower than that of leaves and roots. The concentration of acid-volatile sulfides does not seem to influence the availability of metals to the seagrass, possibly due to oxygen transport to underground tissues. The highest metal concentration in all the contaminated stations was found in the leaf-biofilm, due to the formation of complexes between metals and the extracellular polymeric substances that form the biofilm. All the seagrass beds were seen to be undergoing expansion, those growing in contaminated sediments accumulating great quantities of metals and showing highest photosynthetic leaf surface area and highest leaf biomass. However, these structural parameters were not seen to be responsible for the differences in the faunal composition observed between contaminated and reference beds. Moreover, the multivariate analysis identified the metal content of leaves, biofilm and sediments as important variables that may be responsible for these differences in faunal composition. In this study we have demonstrated that both the seagrass C. nodosa and the biofilm on the plant leaves may be used as environmental tools in the Mar Menor lagoon. The former is an useful indicator of sediment contamination, whereas the latter seems to be a good sentinel of water quality.  相似文献   

潮坪层序的粒度特征与沉积相划分--以杭州湾庵东浅滩为例   总被引：1，自引：0，他引：1  

郭艳霞  范代读  赵娟 《海洋地质前沿》2004,20(5):9-14

现代潮滩依据多年平均潮位线划分高、中、低潮滩，这对于古代潮坪沉积相研究无实际意义。本文尝试用潮坪层序粒度参数剖面来划分沉积相。潮坪沉积物以粉砂为主，但敏感地反映沉积动力变化的却是粗、细尾部分。因此，在沉积相划分时主要依据粘土、砂含量及平均粒径的变化特征。分选系数是一重要依据，但要考虑絮凝沉积的影响。偏态和峰态变幅小、较复杂，在相划分中只具参考价值。利用粒度参数剖面进行潮坪沉积相划分可广泛应用于古代潮坪层序研究，而且根据中潮坪沉积厚度(x)与平均潮差(y)存在的显著性相关关系：y=1．8314x 157．31(单位cm)，推算古潮差。  相似文献   

Effectiveness of the structural fisheries policy in the European Union     

Juan C. Surís-Regueiro  Manuel M. Varela-Lafuente  Carlos Iglesias-Malvido 《Marine Policy》2003,27(6):535-544

This paper presents an analysis of the effectiveness of the community structural policy in the fisheries sector by comparing the relative level of compliance with objectives (reduction of fleets and economic viability) with the mechanisms that have been implemented (structural funds and allocation of quotas). On the one hand, this analysis shows that there is a positive correlation between the level of structural funds and the attainment of goals. On the other hand, it was found that the greater the relative availability of quotas, the poorer the countries performed in complying with the objective of reducing the fishing capacity, and the higher the expectations of achieving acceptable yields. These correlations, however, were not very strong.  相似文献   

Diel variation in the vertical distribution and schooling behaviour of sardine (Sardina pilchardus) off Portugal     

Zwolinski  Juan; Morais  Alexandre; Marques  Vitor; Stratoudakis  Yorgos; Fernandes  Paul G. 《ICES Journal of Marine Science》2007,64(5):963-972

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Strip theories applied to the vertical motions of high speed crafts     

F. Prez Arribas  J.A. Clemente Fernndez 《Ocean Engineering》2006,33(8-9):1214-1229

The motions of a high speed craft are highly influenced by speed and dynamic forces that begin to be important for high Froude numbers. Classical ship motions theories and some seakeeping programs do not include the effect of these dynamic forces that mainly affect to the damping of vertical motions, and have to be corrected to model high speed crafts. In any other way, the use of these theories or programs would be unrealistic. In this paper, some theories that can be used to predict the seakeeping behaviour of high speed crafts, considering dynamic forces, are studied and validated against seakeeping tests of some fast monohulls models. Tests and results focus on vertical motions in head seas, which are the most severe for these fast crafts. Experimental results of vertical motions are compared with numerical calculations and conclusions about the range of application of the presented theories are obtained.  相似文献   

Morphometric and gonad maturity in the spider crab Maja brachydactyla: a comparison of methods for estimating size at maturity in species with determinate growth     

Corgos  Antonio; Freire  Juan 《ICES Journal of Marine Science》2006,63(5):851-859

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