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更新和定时提供准确的轨道参数是保障获高质量极轨卫星资料的关键环节，本文介绍了卫星轨道报内容及格式，同时介绍了卫星轨道报自动传输提取和管理，并给出了实际运行情况和效果。 相似文献
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海洋水文气象监测是海洋环境研究和海洋开发的基础工作,而现代化的仪器设备又是提高监测水平的有效工具。ZQA2-1型海洋水文气象监测系统是以微型计算机为核心的自动监测装置。它可以自动、定时,长期地将所监测的海洋水文、气象要素进行打印和存贮,为用户提供实时和历史的资料。本文介绍了该系统的技术性能指标、基本构成与工作原理、应用程序等内容,并对其中有些技术问题作了较详细地论述。 相似文献
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本文对FURUNO气象传真接收各按钮的名称、功能作了简单介绍，详细地叙述了接收气象传真资料的方法，尤其是如何设置、修改定时接收时间表、自动地接收清晰的资料等，并对接收中常见的故障排除、调试方法亦做了介绍，以提供预报人员和操作人员使用。 相似文献
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海浪规测基本上是在白天的四次定时进行,因此,资料使用者对资料能否反映所测海区的实际情况提出了异议。本文应用遥测波浪仪每天8次定时观测资料和部分加密观测资料进行分析,对目前海浪观测时次代表性问题进行探讨。 相似文献
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渤海海域的风特性统计分析 总被引：5，自引：1，他引：5
利用渤海海域１２个气象台站１９６５￣１９８６年２０余年的定时测风资料，统计确定了该海域年最大风速的概率分布参数，常风向及风速相关系数；并利用该海域Ｊｚ２０－２平台二个冬季的连续测风资料的相关台站２０余年的定时测风资料，统计了渤海辽东湾疲劳的风速的概率分布及其分布参数，从而为该海域的海洋结构物设计和疲劳累积损伤分析提供了直接可用的风特性依据。 相似文献
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为了解决浮子式水位计（以下简称浮子水位计）由工作人员定时到潮位观测场校准的工作问题,提高校准准确度,设计了基于图像识别与远程校准的潮位观测系统。该系统依靠在潮位观测场搭载摄像机拍摄目标,采集井内水尺图像,并通过4G、5G通讯将井内水尺视频图像和浮子水位计观测的数据传输至数据中心。数据中心管理软件通过对水尺图片进行图像识别获取井内水尺读数,对井内水尺数据和浮子水位计观测的潮位数据进行对比分析,计算系统不确定度、随机不确定度、综合不确定度,当综合不确定度大于规范误差时,系统不确定度作为漂移量发送给浮子水位计,实现浮子水位计的远程自动校准。经示范应用验证,系统功能性能指标满足业务化运行需求。 相似文献
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通常情况下 Wire- frame(线框图 )不能唯一描述 3D object。本文给出 1种基于 Wire- frame的 3D object重构求解算法。该算法获得唯一解时 ,则表明 Wire- frame对应唯一的 3D object;多个解时 ,则给出所有的可行解 相似文献
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A three-dimensional model of a two-part underwater towed system is studied. In the model, the governing equations of cables are established based on the Ablow and Schechter method. The boundary conditions for the two-part underwater towed system are derived. The six-degrees-of-freedom equations of motion for submarine simulations are adopted to predict the hydrodynamic performance of a towed vehicle. The established governing equations for the system are then solved using a central finite difference method. In this paper several algorithms are used to solve this special form of finite difference equations. The results in this paper indicate that the two-part underwater towed system improves the dynamic behavior of the towed vehicle and is an easy way to decouple the towing ship motion from the towed vehicle. Because the model uses an implicit time integration, it is stable for large time steps and is an effective algorithm for simulation of a large-scale underwater towed system. 相似文献
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《Marine Policy》2017
A coupled population dynamics and economic model is applied to the purse seine anchovy-fishery in the Gulf of Cádiz. The model simulates the population dynamics, landings and profits on a probabilistic frame. These simulations are used to assess the biological and economic consequences of an individual quota management framework enveloped by a fixed Total Allowable Catch (TAC), the present strategy used to manage this stock in the Spanish fishery. Our results accurately indicate that this strategy magnifies the biological and economic vulnerabilities associated with the exploitation of the stock, thus jeopardizing the sustainability of this fishery. Alternative strategies, such as an adaptive TAC, are explored. The results indicate that even a basic implementation of an adaptive TAC seems more favorable than the present strategy in the necessary equilibrium between profits and sustainability. This paper provides tools and an assessment that may also be useful for other small pelagic fisheries. 相似文献
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80年代以来 ,肝胰脏细小病毒病在养殖中国对虾中广泛流行并造成了一定的损失。作者采用免疫金银染色 (immunogold silver staining,IGSS)技术 ,对患病对虾肝胰脏中的细小病毒(Hepatopancreatic parvovirus,HPV)进行了免疫组织化学的研究。结果表明 ,经 IGSS染色的病虾肝胰脏上皮细胞核内出现了黑色的、圆形或椭圆形、大小为 3～ 15μm的结构。由于该结构与 H- E染色切片上出现的肝胰脏细小病毒包涵体在发生部位、形态和大小上皆一致 ,故而认为该结构为HPV包涵体。证明 ,免疫金银染色法是一种可应用于中国对虾肝胰脏细小病毒病诊断的有效方法。 相似文献
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C. Fernandez 《Marine Ecology》1998,19(1):1-11
Abstract. Monthly soluble and insoluble protein, carbohydrate, lipid and ash levels and energetic content were measured in tissues of Paracentrotus lividus adults living in a lagoonal environment over a 1-year period to increase our understanding of resource allocation to the different tissues. The biochemical composition of P. lividus individuals in this environment is similar to that observed in other environments. The gonad and gut contained a high level of proteins soluble or insoluble, a lesser amount of lipids and, finally, a low level of carbohydrates. The main component of the test was ash, followed by protein levels. The lipid and carbohydrate levels in the test were very low. Seasonal variability in the biochemical composition of the different body parts was observed. In the gonad, an increase in the level of lipids was recorded concomitant to an increase in gonad weight. The lipids and carbohydrates, after an initial increase, decreased with the maturation of the gonad. The biochemical variations observed in the gut seem to be linked to both the reproductive cycle and the sea urchin's trophic activity. Variability in the test was low and irregular for all of the observed biochemical components. As P. lividus is an important member of the benthic community in the Urbinu lagoon, this echinoid represents an important store of materials and energy within this lagoonal environment. 相似文献
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R Daly CAK Daly RH Bennett PD Cowley MAM Pereira JD Filmalter 《African Journal of Marine Science》2018,40(3):315-321
The giant trevally Caranx ignobilis (Forsskål) is an important apex predatory fish typically associated with coral reef communities. It is prized in recreational and commercial fisheries, yet little is known about its aggregation dynamics and susceptibility to fishing pressure. This study reports on a previously undocumented aggregation of mature giant trevally observed over a period of eight years (2010–2017) at Ponta do Ouro Partial Marine Reserve in southern Mozambique. The aggregation is one of the few recorded for this carangid in the western Indian Ocean and represents the first subtropical aggregation of giant trevally. The aggregation is also the largest recorded for this species, with up to 2 413 individuals representing an estimated biomass of approximately 30 tonnes. The size and predictability of this annual aggregation make it vulnerable to overexploitation and point towards the need for an appropriate conservation management strategy. 相似文献
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C. K. Paull W. Ussler H. G. Greene R. Keaten P. Mitts J. Barry 《Geo-Marine Letters》2003,22(4):227-232
A sediment gravity flow descended through the axis of Monterey Canyon on 20 December 2001 at 13:35 Pacific standard time.
The timing of this event is documented by a current-meter package which recorded an 11.9-dbar pressure increase in less than
10 min and was found 550 m down-canyon from its deployment site, buried completely within a >70-cm-thick gravity flow deposit.
This event is believed to have started in less than 290 m of water because an instrument at this location was also lost at
the same time. A 178-cm core collected after the event from the axis of the canyon at 1,297-m water depth contained fresh,
greenish, chlorophyll-rich organic material at 32-cm sub-bottom depth, suggesting the event extended to this water depth.
The only trigger identified for this mass movement event appears to be moderate sea and surf conditions. Thus, gravity flow
events of this magnitude do not require an exceptional triggering event. 相似文献
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C. K. Paull W. Ussler H. G. Greene R. Keaten P. Mitts J. Barry 《Geo-Marine Letters》2002,22(4):227-232
A sediment gravity flow descended through the axis of Monterey Canyon on 20 December 2001 at 13:35 Pacific standard time. The timing of this event is documented by a current-meter package which recorded an 11.9-dbar pressure increase in less than 10 min and was found 550 m down-canyon from its deployment site, buried completely within a >70-cm-thick gravity flow deposit. This event is believed to have started in less than 290 m of water because an instrument at this location was also lost at the same time. A 178-cm core collected after the event from the axis of the canyon at 1,297-m water depth contained fresh, greenish, chlorophyll-rich organic material at 32-cm sub-bottom depth, suggesting the event extended to this water depth. The only trigger identified for this mass movement event appears to be moderate sea and surf conditions. Thus, gravity flow events of this magnitude do not require an exceptional triggering event. 相似文献
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In this paper an explanation is given of Rijkswaterstaat's need for hydrological and meteorological information. The present means to gather this information are described together with their limitations. Future developments in the field of HF narrow-beam groundwave radar systems are indicated and some recommendations are given for the design of an operational HF radar system for Rijkswaterstaat (RWS). 相似文献