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301.
Caroline Andrade Enner Alcântara Nariane Bernardo Milton Kampel 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(7):2175-2188
Monitoring chlorophyll-a (Chl-a) concentrations in inland waters is crucial for water quality management, since Chl-a is a proxy for phytoplankton biomass and, thus, for ecological health of a water environment. Chl-a concentration can be retrieved through the inherent optical properties (IOPs) of a water system, which, in turn, can be remotely sensed obtained. Quasi-analytical algorithm (QAA), originally developed for ocean waters, can also retrieve IOPs for inland waters after re-parameterizations. This study is aimed at assessing the performance of sixteen schemes composed by QAA original and re-parameterized versions followed by models that use absorption coefficients as inputs for estimating Chl-a concentration in Ibitinga reservoir, located at Tietê River cascading system, São Paulo State, Brazil. It was verified that only QAAV5 based schemes were able to obtain reasonable estimates for image data and that by four models tested presented similar and acceptable results for QAAV5 outputs. The best model were applied to a Ocean and Land Colour Instrument (OLCI) image. Light absorption in the reservoir showed to be dominated by colored dissolved organic matter (CDOM), and wide spatial and temporal variability of optical and water quality properties was observed. 相似文献
302.
D. Kucharski G. Kirchner H.-C. Lim F. Koidl 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
The nanosatellite BLITS (Ball Lens In The Space) demonstrates a successful design of the new spherical lens type satellite for Satellite Laser Ranging (SLR). The spin parameters of the satellite were calculated from more than 1000 days of SLR data collected from 6 High Repetition Rate (HRR) systems: Beijing, Changchun, Graz, Herstmonceux, Potsdam, Shanghai. 相似文献
303.
The high level of safety demand of civil aviation requests local area augmentation system (LAAS) extremely high navigation integrity performance. A new LAAS pseudo-range error overbound method is proposed in this paper to improve the integrity of LAAS. Firstly, a more practical pseudo-range error distribution model is established. Then, by calculating the relationship between the statistical uncertainty of the model parameter and the integrity risk, a new method is proposed to calculate the pseudo-range error over-bound model. This method can effectively reduce the inflation factor and the resulting conservativeness of the over-bound model. Comparative experiments show that the method proposed in this paper performs better and satisfies the requirements of real applications. 相似文献
304.
On February 13th 2012, the LARES satellite of the Italian Space Agency (ASI) was launched into orbit with the qualification flight of the new VEGA launcher of the European Space Agency (ESA). The payload was released very accurately in the nominal orbit. The name LARES means LAser RElativity Satellite and summarises the objective of the mission and some characteristics of the satellite. It is, in fact, a mission designed to test Einstein's General Relativity Theory (specifically ‘frame-dragging' and Lense-Thirring effect). The satellite is passive and covered with optical retroreflectors that send back laser pulses to the emitting ground station. This allows accurate positioning of the satellite, which is important for measuring the very small deviations from Galilei–Newton's laws. In 2008, ASI selected the prime industrial contractor for the LARES system with a heavy involvement of the universities in all phases of the programme, from the design to the construction and testing of the satellite and separation system. The data exploitation phase started immediately after the launch under a new contract between ASI and those universities. Tracking of the satellite is provided by the International Laser Ranging Service. Due to its particular design, LARES is the orbiting object with the highest known mean density in the solar system. In this paper, it is shown that this peculiarity makes it the best proof particle ever manufactured. Design aspects, mission objectives and preliminary data analysis will be also presented. 相似文献
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307.
James R. Drummond Jiansheng Zou Florian Nichitiu Jayanta Kar Robert Deschambaut John Hackett 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2010
The MOPITT (Measurements of Pollution in the Troposphere) instrument has provided more than nine years of global carbon monoxide (CO) measurements on a continuous basis since its launch aboard the Terra Spacecraft on December 18th, 1999. This paper gives an overview of the core sub-system performance and major issues of the in-flight instrument over the mission period. Some of the instrument anomalies are also discussed. The major successes are: (1) the concept of using a combination of correlation systems such as Length Modulated Cells (LMCs) and Pressure Modulated Cells (PMCs) to retrieve CO profiles in the troposphere; (2) the redundant design in the instrumentation which was crucial for coping with unexpected in-flight anomalies and for continuing the mission in the case of component failure; (3) the thermal environment on orbit that is so stable that some calibration procedures are not necessary; and (4) the recent production of CO total column retrieved from the MOPITT 2.3 μm channel. 相似文献
308.
为尽量避免保险事故发生,减少事故损失,保险公司必须对所承保的标的进行风险控制。然而,在风险控制的实际工作中,由于危险源的潜在性,使得识别危险源具有一定困难。本文运用系统安全的两类危险源理论,阐述了辨识火灾危险源的具体方法,并引用美国军用标准中提供的风险定性分级方法,提出了一种对火灾危险源进行分级的方法。 相似文献
309.
介绍单元肼为推进剂的卫星推进系统,该系统已成功用于我国地球同步轨道通信卫星,高可靠,长寿命。叙述了系统及各部件的主要性能,关键部件的特性与可靠性试验,材料相容性试验,微粒控制及系统热试车。根据多年的飞行试验及地验对系统进行了可靠性计算。 相似文献
310.
根据当前农村金融的现状,我国应以财政补贴为手段,以政策性银行为主体,以政策性农业保险为后盾,尽快构建政策性全融支农体系,承担起全面的支农任务。国家财政应列出一部分预算用于转移性财政支出,即向有政策性金融业务的机构提供贴息资金和呆账损失的补偿,这样做有利于引导社会资金流向农业和农村。政策性支农的主体应是政策性银行,在我国粮棉购销市场全面放开后,我国的农业政策性银行——农发行基本完成了它的历史使命,其职能应重新定位。此外,我国应加强对农业保险的支持力度,在财政资金投入、税收、再保险等方面给予其优惠政策。 相似文献