共查询到20条相似文献,搜索用时 46 毫秒
1.
Richard Goss 《Maritime Policy and Management》2013,40(4):357-362
A paper for the ‘Management of Risks in Engineering’ seminar on ‘Risks, Vulnerabilities and Exposures in Transport (air, space, sea and land)’ organised by the Association Internationale pour I ‘Etude de I ‘Economie de I’ Assurance, Munich, October 21–22, 2002. 相似文献
2.
It is well known that the general circulation on the Catalan continental slope is dominated by a quasi-permanent southwestward geostrophic jet associated to the so-called Catalan front [Millot, C., 1987. Circulation in the western Mediterranean sea. Oceanol Acta 10, 143–149; Font, J., Salat, J., Tintoré, J., 1988. Permanent features of the circulation in the Catalan Sea. Oceanol. Acta 9, 51–57]. On the continental shelf, however, the flow is modified by the action of friction which enhances also other nonlinear interactions. Several authors have hypothesized that the shelf circulation is anticyclonic north of the Ebro delta [Salat, J., Manriquez, M., Cruzado, A., 1978. Hidrografia del golfo de Sant Jordi. Campaña Delta (Abril 1970). Investigación Pesquera 42 (2), 255–272; Ballester, A., Castellví, J., 1980. Estudio hidrográfico y biológico de las plataformas continentales españolas: I. Efecto de los efluentes de una planta de energía nuclear en el Golfo de San Jorge (Febrero 1975–Octubre 1976). Informes Técnicos del Instituto de Investigaciones Pesqueras 76, 70 pp.]. A quasi-3D finite element code based on the shallow-water equations has been used to explore the effect of several mechanisms which might be responsible for such a local circulation pattern, and in particular of wind. The obtained numerical results suggest that the basic anticyclonic structure of the mean flow is controlled by the bathymetry and that the clockwise-rotating mean flow pattern is not a permanent circulation feature. It is seen that the characteristic local wind stress fields—computed through interpolation of the records of a local network of meteo stations—may ‘enhance' or ‘delete' the anticyclonic gyre depending on the sign of their relative vorticity. According to the analysis of a 2-yr record of local wind data, the net contribution of wind events with a duration longer than 24 h is to reinforce the anticyclonic circulation (over 70% of these wind fields supply negative relative vorticity to the study area). 相似文献
3.
4.
Christophe Lett Pierrick Penven Patricia Ayn Pierre Fron 《Journal of Marine Systems》2007,64(1-4):189
A Lagrangian model is used to simulate and quantify in the northern Humboldt upwelling ecosystem the processes of enrichment, concentration and retention, identified by Bakun [Bakun, A., 1996. Patterns in the ocean. Ocean processes and marine population dynamics. University of California Sea Grant, California, USA, in cooperation with Centro de Investigaciones Biologicas de Noroeste, La Paz, Baja California Sur, Mexico, 323 pp.] as being important for the survival and recruitment of early life stages of pelagic fish. The method relies on tracking the positions of particles within water velocity fields generated by a three-dimensional hydrodynamic model. Simple criteria for considering particles as participating to enrichment, concentration or retention are used to derive indices of the three processes. We analyse the spatial distribution of and seasonal variability in these indices. The results are discussed in relation to anchovy (Engraulis ringens) eggs and larvae distributions off Peru, and to a comparable study conducted in the southern Benguela upwelling ecosystem. 相似文献
5.
介绍了当前船用焚烧炉技术的现状,以及国内和国外的技术研究情况。通过对不同技术的比较,分析了船用焚烧炉的运行环境,探讨了船用焚烧炉技术的发展趋势。 相似文献
6.
7.
1.1 Multimodal transport,published in 1995,was completed by prof.ralph de wit,an eminent scholar,on the basis of a considerable survey of such shipping countries as the united states,the united kingdom,france,gemany and so on the author has made in this book a comparison between the common law rules and various continental legal systems, 相似文献
8.
主要阐述了具备自航能力的自升式海上风电安装船在船型设计阶段的模型试验和计算分析,为相似船型和类似海洋工程装备的设计研究提供了参考. 相似文献
9.
10.
11.
预警机技术在现代战争中发挥着越来越重要的作用.论文介绍了预警机技术的发展历程以及装备的研制、改进情况,指出了在现代战争中发展预警机技术的优势和重要性,重点探讨了几种预警机技术的性能及其特点,最后论述了预警机技术的发展动向与分析. 相似文献
12.
13.
每次采访李绍德委员,都会收获一份惊喜。2009年"两会"期间,他针对当时金融危机导致航运、造船市场低迷的状况,敏锐地提出加速淘汰单壳油轮的建议,受到各方的高度关注。年底,交通运输部关于加快淘汰国内航行单壳油轮的实施方案出台,提振了市场信心,对有效刺激油轮运输市场需求,带动船舶产业发展发挥了重要作用。今年"两会",我们再一次怀着激动的心情走近李绍德委员。 相似文献
14.
15.
16.
17.
挂篮施工方法在天津港桥梁工程中的应用 总被引:1,自引:0,他引:1
根据天津港南疆港区复线公路桥工程的挂篮施工实践,简要介绍挂篮的主体构成、移动形式、拼装过程及挂篮施工程序,并就施工过程中挂篮的加载试验控制、移动控制、悬臂施工线型控制的内容和方法以及施工线型控制质量标准等做详细说明。 相似文献
18.
齿轮泵壳沉陷孔中心距是影响齿轮泵质量的关键尺寸。本文提出的测量方法操作方便快捷,测量结果精确,适合于大批量生产使用.对于类似另件尺寸测量也可推广使用。 相似文献
19.
20.
流星余迹猝发通信分析 总被引:2,自引:0,他引:2
介绍流星余迹猝发通信产生的条件、用途、主要特征、组网方式、关键技术及干扰方法等。并分析了它的一些内在规律,同时得出流星余迹猝发通信在现代通信中具有较大价值的结论,使大家对流星余迹猝发通信有一个概要的认识。 相似文献