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二手船,是指经过一段时间的营运使用后,由原船东转手出售给新船东,可继续投入营运使用的旧船.废钢船则是经过长时间的营运使用后,接近或超过船舶使用年限,由船东报废出售给拆船厂拆解的旧船.就船舶本身而言,两者之间没有严格的区别,主要是船东根据航运市场、船舶市场的行情和前景预测,决定是卖二手船还是卖废钢船.遇到航运市场低迷时,船东会大量抛售废钢船.反之,在航运市场繁荣时,二手船市场会随之活跃. 相似文献
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为保障航运企业船岸网络信息安全,维护航运企业利益,分析船岸网络安全现状,总结常见的网络攻击形式和安全漏洞,归纳处理网络攻击事件的基本步骤,提出船岸网络安全管理目标和安全团队成员岗位职责,并结合具体案例分析船岸网络信息安全管理的应用,为航运企业做好船岸网络信息安全工作提出建议。 相似文献
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在现代交通物流运输方式中,船舶航运占有非常大的份额,是社会生产和商品交流的重要环节。随着互联网与计算机技术的发展,如何改善船舶航运中的交通问题,提高海上航线的利用率,降低海上航运中的安全隐患,保证海上航运的安全性与高效性,成为了当前的研究重点。船联网正是基于这种背景下被开发出来的,船联网与VANET网络可以显著改善船舶的通信能力,促进导航信息、航迹数据等传递。本文重点研究了船联网中VANET网络的路由协议和优化算法,并对VANET网络中的路由数据传输进行了仿真试验。 相似文献
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《船舶标准化工程师》2014,(6):68-69
陆上物流网络面临的压力日益增长,由此催生出对其他可替代方案的研究,短途航运是其中最具前景的一种。DNV GL的研究人员因此研发了名为“ReVolt”的短途航运概念船,该船比用传统燃油和运营的船更加环保、智能和安全。自动化、完全由电池驱动并具高效率,该概念船为解决日益增加的交通运输需求提供了一个可能的解决方案。 相似文献
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介绍了我国港口资源的整合现状,指出港口整合可以提升港口的形象和地位,也为区域经济和城市的发展注入强大的动力。最后指出在港口资源整合中要避免的几个问题。 相似文献
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广州集装箱码头的轮胎式场桥小车制动器使用10多年后,出现了许多问题,故进行了改造.分析了轮胎式集装箱龙门起重机小车制动器的主要故障现象,提出了改造方案,并加以实施. 相似文献
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本文对现有的选定球面轴承的三种工程方法进行了分析比较.引入了“合力系数”,并给出了合力方向上投影面积的精确解. 相似文献
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分析柴油机故障中常见的机体裂纹故障原因,认为由于设计缺陷和管理及操作不当,易造成船舶柴油机缸体上的裂纹多发生在气缸套凸肩处。如不及时处理这些裂纹和故障,就会造成缸套的裂纹直至出现缸套漏水等严重后果,针对NANTAIQUEEN轮柴油机对该类型故障的检修提出具体措施。 相似文献
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The hydrophysical and hydrochemical structure of the Sea of Azov, with developed bottom anoxia, was studied during the RV “Akvanavt” cruise from July 31 to August 03, 2001. The anoxic zone with a thickness from 0.5 to 4 m above the bottom was found in all deep regions of the Sea. Concentrations of hydrochemical parameters were similar to the pronounced anoxic conditions (about 90 mmol m− 3 of hydrogen sulfide, 17 mmol m− 3 of ammonia, 6 mmol m− 3 of phosphate, 7 mmol m− 3 of total manganese). The hydrophysical structure was characterized by the uniform distribution of temperature in the upper 6–7 m mixed layer (UML). Below this a thin (0.4–0.8 m) thermocline layer was observed, just above the anoxic waters. Formation of this phenomenon was connected with that summer weather conditions. Intensive rains led to increased influx of river waters in June. That resulted in large input of allochtonous organic matter (OM) and inorganic nutrients; the latter were consumed on the additional autochthonous organic matter production. In July the weather was characterized by a significant rise in the daily averaged air temperature and large oscillations of temperature during the day. In this period a wind of constant direction was absent, but wind bursts were observed. The completed analyses showed that the formation of such a structure could be connected with the following factors: (i) positive growth trends of the daily averaged temperature and the daily oscillations of temperature, (ii) presence of wind bursts. The joint action of these factors resulted in the formation of the UML. The amplitude of wind bursts determined the depth of UML, and the value of trend determined the value of the temperature change in the thermocline. An initial presence of bottom halocline (caused by the Black Sea water influx to the bottom of the Sea of Azov) prevented the heating of the bottom layer and therefore led to an increase of vertical gradient of temperature in the thermocline. The spatial distribution of the turbulent exchange coefficient confirmed the existence of a “stagnation” area located above the anoxia zone, which is also, apparently, the reason for its occurrence. 相似文献
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