ASO-S/HXI太阳指向镜算法研究          下载免费PDF全文

喻福  苏杨  张哲  黄宇 《天文学报》2020,61(4):40

硬X射线成像是研究太阳耀斑等爆发现象的重要手段.由于采用调制成像而非直接成像的原因, X射线图像在日面上的位置需要借助太阳指向镜提供的仪器指向的日面坐标来确定.因此,指向信息对于耀斑定位实现多波段研究,理解太阳耀斑的物理过程具有重要的科学意义.在此对两种太阳指向镜指向信息的获取算法进行了测试.结合太阳指向镜的设计方案,首先利用SDO (Solar Dynamics Observatory)/AIA (Atmospheric Imaging Assembly) 4500?的数据产生测试图像,其次对其进行二值化处理,分别提取日面轮廓和4个边角指定区域面积;最后分别利用最小二乘法和四象限法对太阳中心坐标进行反演.初步结果显示最小二乘法受随机噪声影响小,定位精度相对稳定约为0.25′′,并可提供四象限法解算的初值;后者的精度可以优于0.14′′,但受随机噪声影响较大.两种算法的精度都显著优于硬X射线成像仪(Hard X-ray Imager, HXI)太阳指向镜的设计要求,可为指向数据在将来科学分析中的实际应用提供参考.  相似文献   

中国新型城镇化高质量发展的规律性与重点方向   总被引：10，自引：2，他引：8  

方创琳 《地理研究》2019,38(1):13-22

中国新型城镇化高质量发展是一种人地和谐、高效低碳、生态环保、节约创新、智慧平安的质量提升型城镇化,是高质量的城市建设、高质量的基础设施、高质量的公共服务、高质量的人居环境、高质量的城市管理和高质量的市民化的有机统一。高质量推进新型城镇化发展需要遵循城镇化发展的四阶段性规律和渐进式规律,实现新型城镇化由数量型向质量型、由“一步到位”向“分步到位”、由激进式向渐进式、由诱发“负效应”向释放“正能量”、由被动性向主动型、由“地为本”向“人为本”的战略转型。考虑到中国新型城镇化发展的地域差异显著,新型城镇化高质量发展客观上要因地制宜、因类指导,可将全国新型城镇化高质量发展区域划分为城市群地区（Ⅰ）、粮食主产区（Ⅱ）、农林牧地区（Ⅲ）、连片扶贫区（Ⅳ）、民族自治区（Ⅴ）共5大高质量发展类型区和47个亚区。未来推进中国新型城镇化高质量发展的重点路径包括：增强新型城镇化高质量发展的整体协同性,提高城市群发展质量;推动产城深度融合发展,加快实现基本公共服务均等化,提升城市发展品质与质量;推动城乡深度融合发展,在新型城镇化高质量发展中实现乡村振兴;突出因地制宜,明确不同类型地区城镇化高质量发展的主体功能;创新体制机制,全过程推进城镇化高质量发展;量力而行,以特取胜,规范建设特色小镇,夯实新型城镇化高质量发展的基石;把新型城镇化高质量发展与区域资源环境承载力及高质量保护有机结合起来。  相似文献   

地震成因——地球自转变速、变形振荡     

李仕宏 《大地测量与地球动力学》2009,29(Z1):163-173

从自然平衡空间中的结构物体体表的平衡点的集合构成其体表平衡曲面的理论出发,由平动结构的“平衡点距离规律”导出自然平衡空间中自然结构物体的“平衡曲线距离规律”和“平衡曲面距离规律”,论证了自然平衡空间中一般性结构物体的“旋转振荡效应”。并讨论了“旋转振荡效应”所包含的旋转点、线、面、体的变速、变形的两变之间互为因果的各自的振荡。详细描述了旋转球体旋转振荡的“旋转减速趋扁效应”和“旋转增速趋圆效应”。并利用该规律探索了地震成因。并提出地震成因的简谐振子组合旋转振荡模型。  相似文献   

论我国“1:1万数字高程模型的更新与建库”     

朱庆  李志林  龚健雅  眭海刚 《武汉大学学报(信息科学版)》1999,(2)

结合生产实验对ＤＥＭ的数据源、数据精度与质量控制、数据采集的技术与策略、空间分辨率、地形建模、产品分类和数据组织等方面进行全面的讨论,以期为推进有关工作的进一步完善和在全国实施“１１万数字高程模型的更新与建库”方案提供理论与技术支持  相似文献   

基于纵波地震和四分量地震的弹性波阻抗反演   总被引：3，自引：0，他引：3  

张树林  张志斌 《海洋地质与第四纪地质》2007,27(5):51-56

为了更好地揭示崖13-1气田的泥岩夹层及剩余气分布,提高采收率,尝试了基于纵波地震和四分量地震的弹性波阻抗反演。利用常规纵波地震资料对崖13-1气田气层进行了多角度同时反演;利用四分量地震资料进行了纵波和转换横波波阻抗反演。基于常规纵波地震资料的弹性波阻抗反演剖面的分辨率较高,气层纵波波阻抗与盖层的纵波波阻抗差异大于横波,但横波波阻抗分辨率比纵波波阻抗高,对气层细节反映得更清楚。利用弹性波阻抗反演结果可以较好地发现剩余气、泥岩夹层及气水界面。转换横波地震资料的分辨率较低,基于四分量地震资料的弹性波阻抗反演的分辨率也比较低。  相似文献   

Integrated gravity and magnetic study on patterns of petroleum basin occurrence in the China seas and adjacent areas     

Tao He  Wanyin Wang  Zhizhao Bai  Xingang Luo  Jing Ma  Yimi Zhang 《海洋学报(英文版)》2023,42(3):201-214

The China seas and adjacent areas contain numerous petroleum basins. One of the main challenges for future oil and gas exploration is to identify the inherent patterns of petroleum basin distribution. The formation and evolution of petroleum basins along with the migration and accumulation of oil and gas are often closely related to the tectonic environment. The gravity and magnetic fields with high lateral resolution and wide coverage provide important data for regional tectonic research. Based on the gravity data in the Global Satellite Gravity Anomaly Database (V31.1) and magnetic data from the Earth Magnetic Anomaly Grid (2-arc-minute resolution) (V2), this study uses integrated gravity and magnetic field technique to obtain integrated gravity and magnetic field result for the China seas and adjacent areas, and then adopts the normalized vertical derivative of the total horizontal derivative technique to conduct partition. Finally, it identifies the relationship between the partition characteristics and tectonics as well as the patterns of petroleum basin occurrence. The research shows that the partition of gravity and magnetic field integrated result has a good correlation with the Neo-Cathaysian tectonic system and tectonic units. The petroleum basins are characterized according to three blocks arranged from north to south and four zones arranged from east to west. The north?south block structure causes the uneven distribution of oil and gas resources in the mainland area and the differences in the hydrocarbon-bearing strata. Petroleum basins are more abundant in the north than in the south. The ages of the main oil- and gas-bearing strata are “Paleozoic–Mesozoic, Paleozoic–Mesozoic–Cenozoic, and Paleozoic–Mesozoic”, in order from north to south. The difference in the overall type of oil and gas resources in all basins is controlled by the east–west zonation. From east to west, the oil and gas resource type exhibits a wave-like pattern of “oil and gas, gas, oil and gas, gas”. The vertical distribution is characterized by an upper oil (Mesozoic–Cenozoic) and lower gas (Mesozoic–Paleozoic) structure. Within the study area, the Paleozoic marine strata should be the main strata of future natural gas exploration.  相似文献   

Behavior of different phosphorus species in suspended particulate matter in the Changjiang estuary   总被引：1，自引：0，他引：1  

何会军  陈洪涛  姚庆祯  秦延文  米铁柱  于志刚 《中国海洋湖沼学报》2009,27(4):859-868

Suspended particulate matter (SPM) collected in the Changjiang (Yangtze River) estuary in June 2006 was separated into five fractions via water elutriation: clay-very fine silt (<8 μm), fine silt (8–16 μm), medium silt (16–32 μm), coarse silt (32-63 μm) and sand (>63 μm). The SPM and fractionated particles were sequentially analyzed by a modified SEDEX sequential extraction method to obtain six species of phosphorus: exchangeable or loosely-sorbed P, organic P, Fe-bound P, authigenic P, detrital P and refractory P. The results indicated that all particulate phosphorus species except for detrital P were negatively correlated to particle size; a high detrital P content was found in coarse silt and very coarse silt. From the inside of the river mouth to the gate of the river mouth, organic P, Fe-bound P and refractory P in the suspended particles decreased and a higher amount of exchangeable P appeared around the gate of the river mouth. From the gate of the river mouth to the sea, exchangeable P and organic P in suspended particles increased distinctly. The total particulate P flux into the estuary from the Changjiang River was about 45.45×10⁸ μmol/s during sampling. Of this, about 8.27×10⁸ μmol/s was associated with the “truly suspended” fraction. The bio-available particulate P flux was about 13.58×10⁸ μmol/s. Of this, about 4.24×10⁸ μmol/s was transported by “truly suspended” particles.  相似文献   

浅议如何建立测绘成果信息管理及发布网络系统     

陶渝  李爱迪 《测绘与空间地理信息》2007,30(3):208-210

从重庆的特点出发,阐述了建立测绘成果信息管理及发布网络系统的前提条件,并初步探讨了以地房籍合一为核心的系统目标和相关功能。  相似文献   

Numerical Simulation on Oscillation-Sliding-Uplift Rock Coupled Motion of Caisson Breakwater Under Wave Excitation     

王元战  龚薇  迟丽华 《中国海洋工程》2010,24(2):207-218

Corresponding to the sliding and the overturning failure, the elementary motion modes of caisson breakwater include the horizontal-rotational oscillation coupled motion, the horizontal sliding-rotational oscillation coupled motion, the horizontal vibrating-uplift rocking coupled motion, and the horizontal sliding-uplift rocking coupled motion. The motion mode of a caisson will transform from one to another depending on the wave forces and the motion behaviors of the caisson. The numerical models of four motion modes of caisson are developed, and the numerical simulation procedure for joint motion process of various modes of caisson breakwater under wave excitation is presented and tested by a physical model experiment . It is concluded that the simulation procedure is reliable and can be applied to the dynamic stability analysis of caisson breakwaters.  相似文献   

Numerical Simulation on Oscillation-Sliding-Uplift Rock Coupled Motion of Caisson Breakwater Under Wave Excitation     

王元战  龚薇  迟丽华 《海洋工程》2010,(2):207-218

Corresponding to the sliding and the overturning failure, the elementary motion modes of caisson breakwater include the horizontal-rotational oscillation coupled motion, the horizontal sliding-rotational oscillation coupled motion, the horizontal vibrating-uplift rocking coupled motion, and the horizontal sliding- uplift rocking coupled motion. The motion mode of a caisson will transform from one to another depending on the wave forces and the motion behaviors of the caisson. The numerical models of four motion modes of caisson are developed, and the numerical simulation procedure for joint motion process of various modes of caisson breakwater under wave excitation is presented and tested by a physical model experiment. It is concluded that the simulation procedure is reliable and can be applied to the dynamic stability analysis of caisson breakwaters.  相似文献