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根据滩海地区油田海上生产平台的特点,本文介绍了海上油田消防系统中水消防系统,泡沫灭火系统、ＣＯ２灭火系统及其它消防设施的设计。 相似文献
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针对舰船磁场检测这一问题,提出了一种利用 PNI 磁传感器测量的方案,并设计了一套由 STC15 单片机控制的舰船磁场检测系统。 系统由 PNI 磁传感器、STC15 单片机、串口通讯模块、电源分配模块和上位机组成,实现了信号的采集、调理、传输和分析处理的过程。 最后,通过水池船模试验证明了该测量系统能够实现对舰船磁场信号进行检测。 相似文献
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海浪是影响舰船行进和结构设计的最核心的环境要素。海浪参数的统计分析是建立舰船环境适应性长期预测模型的基础。对1993-2011年沿海台站、浮标观测资料,高度计观测资料和船舶报观测资料进行双线性插值,给出了海浪波高的分析场。利用波高分析场对WAVEWATCHIII(WW3)模拟结果进行最优插值同化。给出了海浪统计玫瑰图、极端海浪统计参数和海浪累年二维极值海浪谱等与舰船耐波性有关的海浪统计参数,分析了中国近海的波浪特征。 相似文献
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在SAR与AIS联合探测探测舰船目标实验中,通过对2010-11-05T06：51渤海海峡Radarsat-2影像的和与之时空匹配的AIS数据比较,发现2种手段探测到的静止的舰船目标能够精确的匹配,但是运动的舰船目标存在一定的偏差.分析了偏差产生的原因,其中距离向偏差是由时间误差引起的;方位向偏差主要是由多普勒频移造成的;这与运动舰船目标的航速、航向及SAR与AIS的探测时间误差有关.在此基础上建立了数学模型,分析上述参数对偏差的影响,并对偏差加以修正,从而实现了SAR与AIS探测结果的匹配. 相似文献
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关于研制防风短索的设想姚宗州，尚永春（海军后勤学院）海军舰船在完成作战任务和训练任务后，一般停靠在军用码头，在军港的特有防风条件和系泊索的协助下，躲避一般风浪对舰船的冲击，而在大风浪条件下，为了避免船与船，船与码头之间的冲撞，需在锚地防风。锚地没有军... 相似文献
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随着海上交通运输业业务需求的不断增加,传统的目标检测方法已无法满足实际需求。由于卫星遥感技术的快速发展,基于合成孔径雷达（Synthetic Aperture Radar,SAR）图像舰船目标自动识别具有显著的应用潜力。近年来,深度学习技术在目标检测领域逐渐显现出优势,特别是YOLO (You Only Look Once)模型以其较高的精度和计算效率,为SAR舰船目标的识别提供了一种新的方法。为对比不同的YOLO模型在舰船目标识别领域的性能及其相比于两阶段深度学习算法的优势,本文首先对YOLO系列的结构进行了归纳总结;其次对当前广泛使用的数据集进行了对比分析,并基于SAR图像数据集（SAR Ship Detection Dataset,SSDD）的样本进行重新标注构建出本文的数据集;然后将YOLO系列模型与两阶段目标检测方法——更快速的区域卷积神经网络（Faster Region-based Convolutional Neural Network,Faster R-CNN）在SAR舰船目标检测的精度和速度两方面进行对比实验;最后在YOLOv5模型的基础上对主干网络（Backbone... 相似文献
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瑞典海军觉得有必要建造一艘巨型战舰，它有两层甲板，配备64门大炮。这艘超级战舰取名为“瓦萨号”于1628年8月2日第一次试航。当它缓缓驶离斯德哥尔摩港时，舰上全体水兵向前来观看的瑞典国王致敬。这时，一阵狂风吹来，舰身立刻倾斜。接着“瓦萨号”又慢慢恢复平衡，但随即再一次朝右舷倾斜。 相似文献
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双功能潜水器是目前国际上比较新型的可用于深海水下观察和作业的装备。既可有缆载人／无人，又可无缆载人。该潜水器最大工作深度450m，其结构材料和结构形式与以往类似的装备不同。文章对双功能潜水器耐压壳结构和载体框架设计中的一些问题进行了探讨，提出的设计思想和计算方法，这对获得一个具有最轻结构重量的实用的双功能潜水器结构具有指导意义。 相似文献
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Abstract. Sediment characteristics determining macrofauna communities were investigated on the continental shelf of Crete. The sedimentary environment of the outer continental shelf of Crete is characterized by a silty substrate with significant decrease in chlorophyll a and organic carbon concentration with depth. Redox potential values indicated an ample supply of oxygen at all depths. Values of most production-related parameters TOC, chlorophyll a , ATP were found at the low end of the range reported from the literature even though the sampling stations were very close to the coastline. Organic carbon to chlorophyll ratios in the sediments indicated that most of the organic material is of phytoplankton origin; the quality of the organic material in the outer shelf, however, seems to be of lower bioavailability. 相似文献
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This article addresses the question of allocation of living marine resources among countries. We examine the principles for distribution emanating from the global rules for ocean governance, review state practice, and consider some distributional effects of conservation measures. We find that it is difficult to ascertain the influence of the distribution principles with any greater degree of precision. The principles vary with regard to their ease of operationalization. Further, state practice shows that distributional principles serve to define the scope for a range of different distributional outcomes, but their relative importance remains elusive. Thus, distributional outcomes cannot be explained in terms of these principles alone. A measure of politics is always at play. 相似文献
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J. A. Karson P. J. Fox H. Sloan K. T. Crane W. S. F. Kidd E. Bonatti J. B. Stroup D. J. Fornari D. Elthon P. Hamlyn J. F. Casey D. G. Gallo D. Needham R. Sartori OTTER 《Marine Geophysical Researches》1984,6(2):109-141
Seven dives in the submersible ALVIN and four deep-towed (ANGUS) camera lowerings have been made at the eastern ridge-transform intersection of the Oceanographer Transform with the axis of the Mid-Atlantic Ridge. These data constrain our understanding of the processes that create and shape the distinctive morphology that is characteristic of slowly-slipping ridge-transform-ridge plate boundaries. Although the geological relationships observed in the rift valley floor in the study area are similar to those reported for the FAMOUS area, we observe a distinct change in the character of the rift valley floor with increasing proximity to the transform. Over a distance of approximately ten kilometers the volcanic constructional terrain becomes increasingly more disrupted by faulting and degraded by mass wasting. Moreover, proximal to the transform boundary, faults with orientations oblique to the trend of the rift valley are recognized. The morphology of the eastern rift valley wall is characterized by inward-facing scarps that are ridge-axis parallel, but the western rift valley wall, adjacent to the active transform zone, is characterized by a complex fault pattern defined by faults exhibiting a wide range of orientations. However, even for transform parallel faults no evidence for strike-slip displacement is observed throughout the study area and evidence for normal (dip-slip) displacement is ubiquitous. Basalts, semi-consolidated sediments (chalks, debris slide deposits) and serpentinized ultramafic rocks are recovered from localities within or proximal to the rift valley. The axis of accretion-principal transform displacement zone intersection is not clearly established, but appears to be located along the E-W trending, southern flank of the deep nodal basin that defines the intersection of the transform valley with the rift floor. 相似文献
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P. J. Fox R. H. Moody J. A. Karson E. Bonatti W. S. F. Kidd K. Crane D. G. Gallo J. B. Stroup D. J. Fornari D. Elthon P. Hamlyn J. F. Casey D. Needham R. Sartori 《Marine Geophysical Researches》1985,7(3):329-358
Three dives in submersible ALVIN and four deep-towed camera lowerings have been made along the transform valley of the Oceanographer Transform. These data constrain our understanding of the processes that create and shape the distinctive morphology that is characteristic of slowly slipping ridge-transform-ridge (RTR) plate boundaries. Our data suggest that the locus of strike-slip tectonism, called the transform fault zone (TFZ), is confined to a narrow swath (<4 km) that is centered along the axis of maximum depth. The TFZ is flanked by the inward facing slopes of the transform valley. The lower portions of the valley walls are characterized by broad sloping exposures of undisrupted sediment but at higher elevations the walls are made up of inward facing scarps and terraces of variable dimensions. Although the scarps have been badly degraded by mass wasting, there is no evidence to suggest that these scarps have accommodated significant amounts of strike-slip motion. Plutonic and ultramafic rocks are exposed on these scarps and the occurrence of this diverse assemblage on small-throw faults indicates that the crust is thin and/or discontinuous in this environment. We suggest that this complex igneous assemblage is the product of anomalous accretionary processes that are characteristic of slowly-slipping RTR plate boundaries. 相似文献
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文中介绍陆地影像图与港口航道图镶嵌的制图工艺,影像图与港口航道图镶嵌后的成图质量评价。简单阐述了作者在绘制该图种过程中的一些体会,以及影像图取代现有港口航道图上陆地地形的可行性。 相似文献
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Kaiji Jamaguchi 《Marine Policy》1982,6(2):151-154
These articles concern two countries with broadly similar diplomatic and military alignments but with defence policies which appear to be evolving in opposite directions. In the first article, Keith Speed MP, Parliamentary Under-secretary of State for the Royal Navy until May 1981, offers a critique of UK naval policy as outlined in the Defence White Paper of June 1981. In the second article, Kaiji Yamaguchi, a professor of international law and member of the Japanese Navy, analyses Japan's defence imperatives in the light of Soviet activity in North-east Asia and US pressure on the Japanese government to increase its defence budget. Both articles highlight the dilemma posed by Soviet expansionism requiring a positive response from the West and a world recession which demands reductions in public spending. 相似文献
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Mohamad Rosni OthmanAuthor Vitae George James BruceAuthor Vitae Saharuddin Abdul HamidAuthor Vitae 《Ocean & Coastal Management》2011,54(8):557-568
A comprehensive maritime industry policy that can be adequately monitored to achieve a competitive advantage is important. The Malaysian maritime industry comprises multifaceted sectors that are governed by fragmented governmental agencies. In this research, we investigated the Malaysian maritime industry cluster comprising three main sectors: Shipping, Ship Industry, Ports and Terminals. The Strength Indicator Model has been developed to reveals the maritime industry cluster. We find that the Competitions, Locations, Connections, Government and Chances factors affect the capability of the Malaysian maritime industry cluster. The result of this study will give a framework for Regulatory bodies and the various stakeholders to support the Malaysia maritime industry progressing toward a more competitive and sustainable development of the industry with the aim to become the developed maritime nation. 相似文献