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光电倍增管与碘化钠晶体是核测井仪的核心部件,在其验收测试和性能参数选择中有着科学、严格的要求.我所在这方面具有先进的测试设备和测试条件,在测井界有着良好的声誉.本文主要阐述了闪烁探测器的组成及简单原理,工程应用中所需的闪烁探测器件的性能测试情况。 相似文献
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为深入分析电离层强闪烁对导航接收机可用性性能的影响,通过构建电离层强闪烁的统计模型,并将该模型通过软件接收机捕获、跟踪环路,经过量化数值仿真分析,得出强闪烁对导航接收机载波相位、载噪比以及码相位的影响,接收机载噪比出现的快速衰落将显著地影响接收机对可见信号的捕获跟踪性能。对比分析无闪烁和强闪烁条件下对接收机可用性能够得出,强闪烁条件破坏了可见星座的跟踪持续性,造成可见测距的失锁,严重影响了可用性能。 相似文献
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The shipping industry in Nigeria since the early 1990s has been experiencing a continuous disastrous downturn. Nigerian shipping companies' participation in international shipping has continued to be very limited. Their presence and impact is hardly felt in the world's shipping industry. Both the national carriers (that is shipping companies with national carrier status) and other indigenous private shipping companies have vessel as well as management problems. These problems have led to the poor performance of the Nigerian shipping industry for over a decade now. The carriers in the industry are not attaining for the country the gains that are supposed to emanate from shipping. This paper points out the importance of shipping to a nation, identifies the problems the country's shipping companies are facing and proffers solutions that include merging of the companies to have strong financial standing and a competitive edge. 相似文献
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我国货运保险业的发展策略 总被引:1,自引:0,他引:1
大力发展民族航运业、金融业的外部环境已经赋予了货运保险业广阔的发展前景,应充分利用现有资源,抓住机遇,发挥自身优势,迎接挑战,提升民族航运保险业的综合实力,为国家航运、金融业的稳步发展保驾护航。作为连接航运和金融业的服务平台,太平洋财险以其在航运保险方面的雄厚实力率先在业内成立了航运保险事业总部。 相似文献
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造船业直接间接拉动国民经济几乎所有行业,丹东发展大型造船业对丹东港、丹东地区乃至辽宁经济意义深远。分析了国内外造船市场态势,指出船舶业是发展中国家经济强国的支柱产业,阐述了丹东地区发展船舶工业的可行性和优越性,并对其作了定位。 相似文献
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我国海洋渔业装备亟待升级 总被引:2,自引:0,他引:2
海洋渔业装备作为渔业生产的重要载体.是渔业和船舶科技发展水平的集中体现。我国是世界第一渔业大国也是第一渔船大国,但渔业装备整体水平落后。这不仅严重影响我国海洋渔业的发展,也使我国的海洋权益受到威胁。对此,业内专家强烈呼吁.大力发展远洋渔业是解决我国资源日益短缺、保障我国可持续发展的重要战略措施。 相似文献
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Ioannis Tsamourgelis 《Maritime Policy and Management》2013,40(5):457-468
Commonly, in the shipping industry of the developed Organisation for Economic Cooperation and Development (OECD) countries, national seafarers are progressively being replaced by non-national ones. The present paper aims to provide a model for this tendency. Our analysis is based on the assumption that when shipowners are called to make decisions concerning crew characteristics (such as crew composition and employment levels), they address themselves to two distinct seafarer markets: the domestic (seafarers from OECD countries, henceforth to be referred to as ‘national’) and the non-national (seafarers from other countries). Whilst workers of the first market are better examples in the field of ‘on-the-job-performance’ (in terms of efficiency and loyalty) than workers of the second, shipowners set their domestic employment rule with the view to maximize their profits facing wages and ‘on-the-job-performance’ from national and non-national seafarers alike. Thus, national seafarers are chiefly recruited as officers and the employment level of non-national seafarers are residual, formed thereafter. Our findings point out that the employment rule concerning nationals is negatively affected by the former's wages, and positively by the wage increases of non-national seafarers and by eventual increases of the differential between the ‘on the job performance’ of nationals and that of non-national seafarers of corresponding specialisation. 相似文献
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旅游房地产是旅游业和房地产业相结合的一种经营形态,也是发展我国旅游业和房地产业的途径。本文旨在通过分析我国旅游房地产开发现状,找出存在的各类问题并试图提出对策以求旅游房地产开发的健康发展。 相似文献