利用3次方位观测天基初轨确定新方法          下载免费PDF全文

赵柯昕  甘庆波  刘静 《天文学报》2022,63(5):54

提出了一种适用于天基空间目标光学观测的初始轨道确定新方法. 通过对比地基和天基观测的几何构型, 分析了利用天基光学观测数据进行初轨确定时计算收敛到观测平台自身轨道的原因. 基于轨道半通径方程和改进Gauss方程, 推导出了斜距条件方程组的解析形式, 将天基光学观测的初轨确定问题转换为求解关于观测时刻斜距变量的非线性条件方程组的问题. 利用轨道能量约束减小了解的搜索区域, 消除了方程组的奇点. 最后利用天基实测数据验证并分析了非线性条件方程组根的性质, 利用低轨光学观测平台对低、中、高轨和大椭圆轨道空间目标的仿真观测数据验证了方法的有效性.  相似文献   

design and construction of national active fault data integration and sharing platform     

SUI Yuan  DU Ke-ping  YU Gui-hua  XU Xi-wei  WU Xi-yan  GAN De-qiang 《地震地质》2015,37(4):1115-1124

Over the past nearly 20 years, there is a huge development in active fault database related technologies in China, mass of active fault data has provided us important basis for researching on earthquake and disaster reduction, etc. However, with the appearance of huge amount of active fault data, lots of problems have emerged, such as data redundancy, inefficient management and information islands, etc. One of the major reasons is lack of efficient method to share the active fault data we owned.By study and comparison, we find that WebGIS is a good solution to solve the problem of active fault data publishing and sharing. WebGIS has well combined the advantages of traditional GIS and internet technologies, it could also share geographic data quickly, provide abundant browsing, searching and analysis functions. Based on the project of "China Earthquake Active Fault Detection—The North China Tectonic Region", and taking the foundational database information sharing platform of the active fault detection and survey as an example, the paper introduces the key technologies of active fault data sharing platform with latest WebGIS technology. The sharing system, which employs ArcGIS Server 10.0 as the GIS server, and utilizes MS-Silverlight technology at the client side, makes use of three-layer architecture which is popular in current B/S mode. To guarantee the security of the database on the internet, data source in the backend of the system is a simplified version of the active fault database of the North China tectonic region. Finally, the system has realized the publishing and sharing of 1 ︰ 50000 active fault mapping and main geophysical survey lines in North China tectonic region, and moreover, it provides some conventional map operations as well as fault searching and locating functions.The wide use of active fault data decides the significance of sharing system. It is very convenient to use this lightweight data sharing system to provide important basis for relevant industries, such as urban planning, land use and engineering site option, etc.  相似文献   

Preliminary Investigation on the Causes of Odd Vibration of Buildings in Guilin City—a Study on the Resonance between Buildings and the Underlying Soil Layer     

ZHANG Fawang  GAN Fuping  LUAN Song  MENG Yan  ZHENG Zhijie  LI Weixuan 《《地质学报》英文版》2020,94(1):152-161

A residential building in Guilin City, China, underwent an up-and-down vibration with an amplitude of 2 cm. By eliminating several causes such as earthquake, wind and construction, in combination with the unique karst geological conditions of Guilin, it was inferred that the effect of turbulent karst water is the main contributor to the occurrence of this vibration. Therefore, a geophysical survey was undertaken on the vibration zone and its surroundings. The resutls suggest that the soil in the upper part of the karst grooves shows conspicuous traces of disturbance and the water content has low resistance. A comprehensive analysis indicates that there is a karst strong runoff zone beneath the area. According to the water level and water temperature data collected automatically by the instrument, it can be concluded that the groundwater level had changed significantly twice during this period, so it was determined that the denudation of groundwater strong runoff causes the overlying soil layer to collapse, forming a soil-water soft-flow material with mixed phase. Since the building in this area was supported by friction piles, the groundwater-soil soft-flow material with mixed phase has intense plasticity, and the up-and-down vibration resulted in the change of the friction piles, which caused the up-and-down vibration of the building structure.  相似文献   

东南沿海干热岩资源成因模式探讨及勘查进展     

李亭昕  蔺文静  甘浩男  岳高凡  张德龙  王贵玲 《地质力学学报》2020,26(2):187-200

干热岩是一种重要的地热资源,绝大部分以开采地壳中生代以来中酸性侵入岩体中所蕴含的热量为主。东南沿海地区是中国最主要的高放射性花岗岩分布区,发育大面积的中生代酸性花岗岩体,是寻找干热岩的良好靶区。通过研究东南沿海大地构造背景、区域大地热流分布、地壳厚度、居里面埋深及新构造等条件,分析了东南沿海干热岩资源的赋存背景,对福建地区是否存在干热岩进行了探讨,并通过控热构造分析提出了东南沿海干热岩资源的成因模式,初步建立了东南沿海干热岩成藏的三元聚热模型,总结了漳州、惠州等地区的干热岩资源靶区勘查进展,相关研究为今后中国东南沿海地区干热岩勘查评价提供了基础。   相似文献   

浅层地下水SF6年龄测试技术及其应用   总被引：5，自引：0，他引：5  

周建伟  周爱国  刘存富  蔡鹤生  甘义群  梁合诚 《地质科技情报》2007,26(4):97-102

地下水年龄是水文地质研究的重要参数,特别是年轻地下水的年龄.论述了安装设计的用于地下水中SF6的测试技术,该技术装置由SF6提取系统和分析测试系统两部分组成,前者由剥离器、硅胶管、冷冻富集陷阱、六通阀、十通阀、高纯氮气钢瓶和载气过滤系统组成,后者由带电子捕获检测器(ECD)的气相色谱仪组成.通过条件实验,该系统测定SF6的标准误差为1.77%,对SF6的最低检测极限为1.0×10-12,测定空气中的SF6只需10 mL气体,测定地下水样时只需1.0 L.研究了地下水SF6年龄的计算程序,计算了石家庄市浅层地下水的年龄.  相似文献   

环境信息学在循环经济系统中的应用     

甘国辉  王志强  王健 《地球信息科学学报》2007,9(1):104-106,122

本文分析循环经济模式的物质循环和信息流的特点,尤其是循环经济活动对环境的作用以及在信息流方面的表现,讨论正在发展中的环境信息学理论与方法及其发展趋势,在此基础上,具体分析面向循环经济系统的环境信息学的特点,可能发挥的作用以及环境信息学在循环经济模式下如何开展研究和需要重点关注的问题。  相似文献   

北京世园会开幕式期间弱降水天气成因     

甘璐  郭金兰  雷蕾  邢楠 《气象与环境学报》2021,37(3):12-18

2019年4月28日傍晚到夜间,北京北部地区出现一次弱降雨天气,对中国北京世界园艺博览会开幕式相关活动的准备工作造成一定的影响.本文分析了此次弱强度、高影响降雨天气的成因,探讨了开幕式重大活动现场气象服务关注的重点.结果表明:世园会开幕式期间受到弱短波槽影响,动力条件较弱,北京处于高压后部和低压辐合区的前部,低层表现为...  相似文献   

用小波分析与灰色支持向量机预测高铁变形     

容静  刘立龙  甘祥前  顾峻峰  周吕 《大地测量与地球动力学》2018,38(5):473-476

针对高铁变形监测数据的非线性特征,构建一种基于小波与灰色支持向量机的高铁变形预测组合模型。利用小波分析获取不同时频尺度上的随机序列和近似序列,通过嵌入维数的确定和高低频数据的相关性分析,将重构后的随机序列作为遗传算法优化SVR模型的输入,对近似序列则采用灰色支持向量机来描述其演变特征,最后将二者预测结果进行耦合叠加,得到小波灰色支持向量机的组合模型预测结果。以贵广高铁实测数据为例,将均方差、平均绝对误差、平均绝对相对误差作为评判指标对预测效果进行评价,结果表明该模型较好地拟合了近似分量,同时避免了细节分量的过拟合,为高铁变形预测提供了新途径。  相似文献   

中国东海和南海4个真虾(甲壳动物亚门:十足目:真虾下目)新记录种   总被引：1，自引：1，他引：0  

甘志彬  李新正 《海洋学报(英文版)》2018,37(10):212-217

采集自中国东海和南海的4个真虾物种,经研究发现为中国海域的新记录物种,即凯氏鞭腕虾（Lysmata kempi Chace,1997）,利普克鞭腕虾（Lysmata lipkei Okuno&Fiedler,2010）;透明近绿虾（Chlorocurtis jactans（Nobili,1904））和黑斑活额虾（Rhynchocinetes conspiciocellus Okuno&Takeda,1992）。本文描述了这四个物种的形态特征,编制了检索表,并对其分类地位进行了讨论。  相似文献   

Experimental and Numerical Study on the Hydrodynamic Characteristics of Solitary Waves Passing Over A Submerged Breakwater     

Zhao  Xi-zeng  Cheng  Du  Zhang  Yi-fei  Li  Meng-yu 《中国海洋工程》2019,33(3):253-267

In this study, solitary waves passing over a submerged breakwater are investigated both experimentally and numerically. A total of 9 experimental conditions are carried out, including different incident wave heights and water depths. Numerical simulations are performed using a high-order finite-difference model solving Navier–Stokes (N–S) equations. The predicted water wave elevation, velocity and pressure show good agreement with experimental data, verifying the accuracy and capacity of the numerical model. Furthermore, parametric studies are conducted by numerical modelling to examine the effects of the geometrical features of submerged dike on hydrodynamic characteristics around the breakwater.  相似文献