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海上补给是指利用各种补给装备及技术在海上对舰船实施物资补充、人员车辆换乘的一种海上作业活动,是海军中远海作战的主要物资保障及转运方式,相关技术的研制及发展历来受到各国重视。本文介绍了国外海军海上补给技术的最新进展,重点针对横向补给、靠帮补给及车辆转驳等关键领域,分析了其背景及现状,梳理了技术研制情况,总结了未来发展趋势及各自关键技术。分析认为,多种新技术应用扩大了物资及装备海上转运的适用范围,提高了输转效率及作业安全性,并使海上补给技术发展呈现出重型化、快速化、智能化的趋势。 相似文献
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电子设备电磁兼容性设计 总被引:2,自引:2,他引:0
介绍了电磁兼容性定义,分析了电磁干扰的分类及传播方式,重点讨论了电子设备电磁兼容性设计方法,即PCB设计、屏蔽、滤波、接地及布局等。结合计算机技术的应用,给出了电子设备电磁兼容性的预评估及建模技术。 相似文献
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ISM/NSM规则的强制实施,进一步规范了航运公司安全与防污染管理活动,提升了航运公司安全与防污染管理水平。文中分析了当前航运公司安全管理体系建立和运行情况及存在的问题,剖析了航运公司建立安全管理体系的一些误区,同时对航运公司安全管理体系运行及维护中常见的问题进行了阐述,并针对航运公司建立及运行安全管理体系存在的问题,对航运公司及海事主管部门提出相应的解决措施及建议。 相似文献
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介绍了海洋工程市场形势及海洋工程船舶的类型及特点,指出海洋工程船舶在开发模式上的变更及电气技术在其中所负有的重要使命。较详细分析了电气系统的技术内容及其性能要求,重点叙述电力推进及动力定位在海洋工程船舶中的重要性。对主要电气设备的类型、规格也作了一定说明。最后,展望了海洋工程船舶的前景及电气系统的发展趋势。 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