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分析曹娥江下游及曹娥江口门以下杭州湾段通航环境,对曹娥江江海直达船型主要参数进行研究,确定适合曹娥江江海直达船舶的船型特征及相关设计要素,并在此基础上提出曹娥江江海直达运输主流船型建议。 相似文献
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以12000 DWT江海直达型顶推组合体船型为例,论述这种船型在江海直达运输方式上的经济性,同时介绍在船型尺度选择、主要技术要求,以及船体线型快速优化等船型总体设计要点. 相似文献
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本文南京地区的地理优势与经济形势、发展江海直达运输的现状与前景、江海直达船型的可行方案,优化船及江海直达船舶的约束条件等。 相似文献
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珠江水系江海直达船型设计 总被引:1,自引:1,他引:0
本文根据对珠江水系的调查分析,提出了广东地区需开发的江海直达船的船型、水动力学性能分析、型线设计方法,以及发展江海直达船中应注意的问题。 相似文献
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随着长江经济带战略的实施,江海直达运输的经济和环保综合优势日益凸显. "十三五"期间,中国船级社利用自身技术优势,基于国际上先进的理念及方法论开展了江海直达关键技术、规范标准、船型开发等方面的研究工作,最终制订了适用于江海直达船舶的技术标准,研发了系列安全节能环保的江海直达概念船型,其载货量、节能效果、经济性等较现有的... 相似文献
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本文根据20,000t级江海直达散货船的应用范围,选取营运三条航线的三艘船舶作为比较对象进行研究,通过计算不同船型在不同航线营运的必要运费率将直达船型与其他船舶进行比较,直观地体现了各船型在不同航线运营时的经济效益。并通过对必要运费率的计算结果进行敏感性分析来寻找对20,000t级江海直达船型来说较敏感的市场因素,并确认与不同船型比较时对其有利的市场波动情况。论文的研究成果可为20,000t级江海直达船型投入市场后的经营方式提供参考,为有意于投入江海运输事业的各界人士提供决策参考。 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