搜索结果: 1-15 共查到“知识库 天文地球动力学”相关记录32条 . 查询时间(3.838 秒)
INVESTIGATING THE STATE OF PLAY OF GEOBIM ACROSS EUROPE
BIM GIS Interoperability GeoBIM Research Challenges interoperability data integration National Mapping and Cadastral Agency
2018/11/9
In both the Geographic Information (Geo) and Building Information Modelling (BIM) domains, it is widely acknowledged that the integration of data from both domains is beneficial and a crucial step in ...
大西安正在进行国际化大都市的建设，建设过程中的政府决策、防灾减灾、规划设计、施工与运营管理等环节都面临着许多与岩土体和地质环境相关的重大问题，尤其是滑坡治理与预报工作。本文通过大量野外调查、测绘和勘查，统计分析了大西安地区发育的滑坡，将大西安地区的滑坡按滑体特征、动力成因和滑动特征分为三大类，又进一步按诱发因素、物质组成、滑面埋深、滑体规模和力学性质进行相应的分类，并从滑坡形貌、滑带与纵断面、变形...
受地球非球形引力、第三体摄动和太阳光压等摄动因素的影响，导航卫星位置存在长周期变化趋势，需要定期对导航卫星进行轨道机动，以保持卫星轨位和导航服务区.导航卫星机动后的定轨，特别是GEO卫星，其频繁轨控后的轨道快速确定问题，是制约卫星可用度和导航系统服务性能的重要因素.在基于伪距相位数据的轨道测定中，轨道与钟差的统计相关是制约卫星轨道快速确定的关键因素，特别是在观测弧段短的情况下，待估参数之间的相关性...
SEAR（Surfactant-enhanced aquifer remediation）技术被用于修复DANPL，其修复机制分为增溶作用和驱替作用，其中驱替作用对于DNAPL的修复更为有效.多孔介质中DNAPL的驱替运移过程中，定量评价DNAPL的修复行为极为重要.本文利用多相流数值模型UTCHEM探究了流速对DNAPL驱替运移行为的影响.通过截留数定量评价流速变化时DNAPL的驱替行为，结果表...
利用动力学方法解算GRACE时变重力场研究
时变重力场 动力学方法 等效水柱高
2015/4/1
本文利用动力学方法建立GRACE (Gravity Recovery And Climate Experiment) K波段距离变率 (KBRR)观测、轨道观测与重力场系数的观测方程, 通过GRACE Level 1B观测数据,成功解算出全球月时变重力场模型——IGG时变重力场模型,并将2008—2009年的解算结果与GRACE三大数据处理机构美国德克萨斯大学空间中心CSR (Center for...
三体问题地面实验的相似性分析
三体动力学 地面实验系统 相似性
2014/4/10
研究了三体问题相似性的分析流程，给出了三体问题实验近似相似性程度的公式化度量方法。首先，明确了三体问题地面实验的构建原理与方法；其次，建立圆形限制性三体问题的动力学模型，并利用相似性分析方法建立三体问题的相似性度量函数；再次，建立存在各种干扰因素情况下实验系统动力学模型，并利用相似性度量函数衡量在干扰因素作用下实验满足相似性的程度；最后，利用数值仿真法进行仿真分析从统计的角度得出各种干扰对于三体问...
Maximum-likelihood reconstruction of photon returns from simultaneous analog and photon-counting lidar measurements
Maximum-likelihood reconstruction photon returns simultaneous analog photon-counting lidar
2011/10/18
We present a novel method for combining the analog and photon-counting measurements of lidar transient recorders into reconstructed photon returns. The method takes into account the statistical proper...
High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)
Exoplanets Planetary systems Planetary formation Astrometry Space Mission
2011/10/11
A complete census of planetary systems around a volume-limited sample of solar-type stars (FGK dwarfs) in the Solar neighborhood with uniform sensitivity down to Earth-mass planets within their Habita...
Observing Conditions for Submillimeter Astronomy
Atmospheric e ects Site testing Submillimeter general
2011/10/20
Consistently superb observing conditions are crucial for achieving the scientific objectives of a telescope. Submillimeter astronomy is possible only at a few exceptionally dry sites, notably Mauna Ke...
Pulsar timing analysis in the presence of correlated noise
pulsars: general – methods: data analysis
2011/10/17
Pulsar timing observations are usually analysed with least-square-fitting procedures under the assumption that the timing residuals are uncorrelated (statistically "white"). Pulsar observers are well ...
Prediction of equilibrium Li isotope fractionation between minerals and aqueous solutions at high P and T: an efficient ab initio approach
equilibrium isotope fractionation aqueous solutions efficient initio approach
2011/10/14
The mass-dependent equilibrium stable isotope fractionation between different materials is an important geochemical process. Here we present an efficient method to compute the isotope fractionation be...
Chemical properties in the most distant radio galaxy
galaxies: active – galaxies: nuclei – quasars: emission lines – quasars: general
2011/10/21
We present a deep optical spectrum of TN J0924-2201, the most distant radio galaxy at z = 5.19, obtained with FOCAS on the Subaru Telescope. We successfully detect, for the first time, the CIV1549 emi...
Application of the Titius-Bode Rule to the 55 Cancri System: Tentative Prediction of a Possibly Habitable Planet
astrobiology— methods: statistical — stars: individual (55 Cnc)— stars: planetary systems
2011/10/19
Following the notion that the Titius-Bode rule (TBR) may also be applicable to some extra-solar planetary systems, although this number could be relatively small, it is applied to 55 Cancri, which is ...
The final parsec problem: aligning a binary with an external accretion disc
accretion accretion discs – black hole physics – galaxies evolution – stars formation – planets and satellites: formation
2011/10/21
We consider the interaction between a binary system (e.g. two supermassive black holes or two stars) and an external accretion disc with misaligned angular momentum. This situation occurs in galaxy me...
Occurrence of the 2:1 commensurability in a gas giant-Super-Earth system
methods: numerical - planets and satellites: formation
2011/10/19
We investigate how the conditions occurring in a protoplanetary disc may determine the final structure of a planetary system emerging from such a disc. We concentrate our attention on the dynamical in...