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????????????????????ù????????????????????????????????????????????????????????????????????SST-HL/SGG-Doppler-VLBI????????????????????50~100 km??     

基于A-star算法的矿井事故救援研究

针对井下不同形状巷道几何空间特征,确立以空间点、线、面为基本图元,以巷道中心线作为三维模型构建的基础框架,建立巷道三维模型。采用启发式路径搜索A-star算法,实现了应急救援路线智能快速选择。实践证明,该方法对于矿井事故定位和救援具有一定的实用性。     

Study on deformation law of circular foundation under combined loading

The foundations of some ocean engineering structures are built to withstand not only the vertical gravity load V, but also the horizontal load H induced by sea waves and current. The horizontal load includes the concentrated force load, the moment load M, and the torque load T termed also as combined loading. It is of academic and engineering significance to study the deformation law of submarine seabed due to combined loading. On the basis of the three-dimensional elastic mechanics solution of circular foundation, numerical methods are used to analyze the deformation law of submarine soil under circular foundation with six degrees of freedom. The finite element analysis results give the elastic deformation law of soil in three dimensional spaces, modify the theoretical elasticity solution, and presents nonlinear soil deformation mechanism under the circular foundation with six degrees of freedom.     

Effects of an artificial oyster shell reef on macrobenthic communities in Rongcheng Bay,East China

An artificial oyster shell reef was deployed in Rongcheng Bay, East China. However, the effects of this reef on the surrounding macrobenthic communities were unknown. We compared sedimentary factors, macrobenthic biomass, abundance, and community composition and ecological indicators between the reef and non-reef areas over a one year period. The mean values for chlorophyll a （Chl a）, total organic matter （TOM）, total organic carbon （TOC）, and total nitrogen （TN） content in surface sediments in the reef area were slightly higher than those in the non-reef area. The Chl a levels differed significantly between the two areas, but the TOM, TOC, and TN were not significantly different. The abundance of crustaceans was significantly different between the two areas, but the abundance and biomass ofpolychaetes, echinoderms, mollusk did not differ significantly. The permutational multivariate analysis of variance （PERMANOVA） revealed that the macrobenthic community differed significantly through time and analysis of similarity multivariate analyses （ANOSIM） revealed that the macrobenthic community differed significantly in some months. The ecological indicators revealed that the environmental quality of the reef area was slightly better than that of the non-reef area. Overall, our results suggest that the artificial oyster shell reef may change the macrobenthic community and the quality of the environment. Despite the lack of an effect in the short term, long-term monitoring is still needed to evaluate the effects of artificial oyster shell reefs on macrobenthic communities.     

风云三号A星(FY-3A)的主要性能与应用

我国的气象卫星发展计划始于上世纪70年代,它包括极轨和静止两个系列卫星,以及相应的地面应用系统。气象卫星由航天科技集团公司负责组织研发,第二代极轨气象卫星系列的第一颗星--风云三号A星(FY-3A)于2008年5月27日在太原卫星发射中心成功发射,它又如太空中的一个流动气象观测站,对地球-大气进行全天候、全天时、三维、定量、多光谱的不间断观测。卫星观测资料通过地面加工处理后生成各类产品数据,例如,大气温度和湿度随高度的分布及变化、云参数、雪和冰、大雾、气溶胶、臭氧、辐射等,可用于气象、气候、农、林、牧业、海洋、水文等多领域。风云三号A卫星数据和产品可通过多种方式向用户提供使用。两年来,在奥运、汛期、生态和自然灾害监测中发挥了重要作用。风云三号A星已是世界气象组织全球对地观测系统的重要成员,不仅为我国经济社会提供服务,同时也服务于世界各国。本文综合性地介绍了我国第二代极轨气象卫星系列首发星的主要特点,分析了可能的应用领域,并给出代表性的产品和应用实例。     

青岛市崂山风景区崩塌地质灾害治理方法探讨——以大平岚崩塌人造景观石治理为例

青岛市崂山风景区旅游主线大平岚附近发生崩塌地质灾害,导致崂山风景区南线道路全线封闭,崩落巨石上方的残留危岩体存在严重安全隐患,急需治理。为使原有景观石得以保护,又不致于形成新的视觉污染,利用人造景观石在崂山风景区大平岚崩塌地质灾害治理工程中进行了探索。实践证明,该方案投资少、工期短、效果好,既消除了崩塌地质灾害隐患,使原有景观石得到了保护,又未形成新的视觉污染,为人造景观石在风景区地质灾害治理工程中的应用起到了示范作用。     

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??CHAMP?????GPS????????????????GPS??????????????????λ??????????????Ч???GPS?????伸?η??????????????????????????????????????????????GPS???????С????LEO????????????????????????????????????????????仯??С???1~2 cm????????????????????????????GPS??????????????????5 ns??     

基于中分辨率成像光谱仪数据的洋面云检测新方法的研究

提出了一种利用中分辨率成像光谱仪热红外窗区通道数据进行云、晴空分离的新方法。该云检测算法从热红外窗区通道亮温出发,并结合水汽廓线,运用水汽规度法计算规度因子的值,利用规度因子的数值状态实现分离云和晴空,从而达到云检测的目的。经过大量的实验,并将结果与中分辨率成像光谱仪官方云检测产品作对比分析,结果表明准确率为91％,算法具有可行性。     

基于决策到决策路径的遗传算法软件测试用例设计

测试用例生成优劣是软件测试自动化效率高低至关重要的一点,常用的随机测试用例自动生成方法虽然实现简单,但具有效率低、冗余大的缺点,而遗传算法适合于处理传统方法难以解决的非线性问题。为了提高测试效率、降低测试成本,通过分析测试用例自动生成和遗传算法的基本理论,在面向决策到决策路径的软件测试基础上,利用程序控制流图详细阐释了对基于遗传算法的测试用例自动生成技术的设计。通过与随机法自动用例生成进行试验对比,表明其效率至少是随机法10倍。     

The Bootstrap Estimation of the Accuracy of Preliminary Orbit Determination

From the point of view of the non-parametric statistics, a general estimation method of the accuracy and con?dence interval of preliminary orbit determination is proposed for the occasion without any other information but observational data. Based on the bootstrap method, the estimation relies only on the observational data and does not require the precise orbit determination as a reference, or the assumption of normal distribution of observational errors. Numerical experiments show that this method is very simple in implementa- tion, and may serve as an easy accuracy evaluation for the preliminary orbit determination and for the follow-up employments.