关于建设菏泽数字国土工程的初步探讨          下载免费PDF全文

张九献  徐晓林 《山东国土资源》2004,20(4):60-63

菏泽数字国土工程主要包括国土资源政务管理信息、土地管理信息、地质矿产资源信息、国土测绘管理信息和国土资源法规监察信息。3S术是其工程中空间数据获取和管理的技术基础。在工程建设中应首先科学编制建设规划。通过规划确定方针，提出目标，明确任务，有序地开展建设。  相似文献   

厄尔尼诺的发生与行星运动     

施平 《热带海洋学报》1993,(3)

厄尔尼诺(El Ni(?)o)现象是海-气耦合系统异常变化的表现,其起因可能不是唯一的,行星运动对地球运动的影响可能会导致El Ni(?)o的发生。根据4个半世纪内El Ni(?)o发生的历史资料,分析其发生和行星运动的关系,得出的结论是:木星赤纬的变化和火星大冲与El Ni(?)o。的发生有显著的关系,表明这2颗行星的运动可能影响El Ni(?)o的发生。文中还根据分析结桌和El Ni(?)o混沌机制的观点,探讨了行星运动对海-气系统变化的影响机制。  相似文献   

Martian Topography: Scaling, Craters, and High-Order Statistics   总被引：1，自引：0，他引：1  

Vladimir Nikora  Derek Goring 《Mathematical Geology》2005,37(4):337-355

The high-order structure functions of Mars topography reveal three specific ranges of scales: (1) scaling range at small scales where the structure functions exhibit scaling behavior; (2) transition range where the structure functions continue to grow but do not reveal scaling; and (3) saturation range at large scales where the structure functions saturate. The scaling and saturation ranges are explored in detail in respect to scaling and intermittency. Analysis of the Mars Orbiter Laser Altimeter (MOLA) data and computer simulations suggest that there are two potential contributors to the small-scale scaling: (i) scale-invariant surface formation; and (ii) effects of discrete morphological forms such as craters. The crater effect also provides an explanation for the large-scale intermittency revealed using the normalized structure functions within the saturation range, which cannot be explained by the ‘scale-invariant’ concept. Overall, the obtained results suggest that the “crater” contribution to the structure function behavior often dominates over the effect of the scale-invariant surface formation.  相似文献   

肇东陨石高压加热—熔融实验研究   总被引：3，自引：4，他引：3  

侯渭  王道德 《岩石学报》1989,5(2):1-8

在30kbar压力下进行了肇东陨石的加热-熔融实验。实验结果表明。从840℃至2050℃,陨石中的金属-硫化物相经历了熔融—两相混溶的过程,最终形成一种Fe、Ni、Co、S之比不相等的多相混合物。而陨石中的硅酸盐相经历了热变质—熔融—熔融分异的过程。初熔温度为1610℃,2050℃时熔体发生分异,有富Si、Al的硅酸盐新相分离出来。以上述结果为依据,本文对类地行星早期层圈构造的形成机制进行了探讨和推论。  相似文献   

行星会合周期与强震的关系     

阎杰英 《山西地震》1993,(2):38-43

行星运行都具有一定的周期性.近百年历次大震是在行星20,59,237年会合及合成与月回归下降时段内发震的.文内把近百年强震与当年天文年历及各大行星运行数据绘制地心距视赤经天象图,及5大行星黄经位置天象图,经过验证得出结论.供长期地震预报参考.  相似文献   

Spectral scaling in Mars topography: effect of craters     

Vladimir Nikora  Derek Goring 《Acta Geophysica》2006,54(1):102-112

Extensive computer simulations aimed at testing a hypothesis that impact craters may explain the scaling behaviour of surface spectra are presented. The simulations show that indeed crater effects alone may explain the spectral scaling of Mars’ topography revealed from MOLA data. The range of the scaling exponents obtained for a wide range of simulation parameters does not exceed the limits observed for Mars. The simulations suggest that the shape of large craters is the key factor leading to the two scaling ranges in the surface spectra. Particular values of the scaling exponents may additionally depend on the depth-diameter relationship and the crater size distribution.  相似文献   

利用JPL行星/月球星历计算遥感水汽中的地球固体潮改正          下载免费PDF全文

王威  隋立芬  马高峰  景义红 《海洋测绘》2010,30(1):22-24

简要介绍GPS遥感水汽的原理,详细讨论了计算地球固体潮改正模型的理论公式。介绍获取JPL星历的方法,以及如何利用JPL行星/月球星历来计算太阳和月亮的坐标,并逐步计算出地球固体潮改正。举例计算了地球固体潮改正,分析了其对水汽的影响,比较了太阳距离、月亮距离与地球固体潮改正的关系。  相似文献   

干涉技术在天体测量中的应用     

金文敬 《天文学进展》2007,25(4):346-363

介绍了射电、光学和红外波段地面干涉的仪器以及近期的进展,如厘米波段的VLBA、EVLA、SKA等;毫米波段的ALMA、CARMA等;光学波段的Keck、VLTI/PRIMA,CHARA、MarkⅢ、NPOI、LBTI等.叙述了目前干涉技术在空间天体测量中应用的一些研究项目。如射电波段的VSOP、iARISE、RadioAstro;光学波段的HST/FGS、SIM PlanetQuest等.探讨了干涉技术在天体测量中的有关研究课题,并概述了其在我国的发展和应用情况.  相似文献   

系外行星系统掩星周期变化研究进展     

董瑶  季江徽  孙昭 《天文学进展》2011,(4):371-386

在掩星法发现的系外行星系统中,如果存在其他未知的伴星绕同一颗恒星运动,掩星行星由于受到伴星引力的影响,运动轨道将发生变化,轨道周期不再是常数,而是变化的。利用这种变化探测掩星系统中的其他行星,已成为一种新的方法。主要介绍了未知行星与掩星行星之间的引力作用引起的掩星周期变化效应,以及掩星周期变化法探测系外行星的理论和研究进展状况,最后简要讨论了几种影响掩星周期变化的其他因素:共轨行星、卫星、潮汐效应、相对论效应及恒星的引力四极矩等。  相似文献   

Seasonal change in the deep atmosphere of Uranus     

Mark D Hofstadter  Bryan J Butler 《Icarus》2003,165(1):168-180

We present high-resolution radio maps of Uranus, made from data collected in 1994 at wavelengths of 2 and 6 cm, which show large-scale changes occurring deep and rapidly in the troposphere. Brightness features in these maps are significantly different from those observed throughout the 1980's. These differences are not due to the changing viewing geometry, but result from atmospheric changes in the 5 to 50 bar region. All the observations show strong latitudinal variations in absorber abundance and/or temperature, causing the South Pole to appear brighter than lower latitudes. The transition between bright pole and darker latitudes is always near −45°, but between 1989 and 1994 the contrast between the regions increased significantly. This suggests that the large-scale circulation in the upper 50 bars of the uranian Southern Hemisphere changed. Older, disk-averaged microwave observations have suggested that seasonal variability occurs, but these new maps are the first to provide detailed timing and location information which can be used to test dynamical models.  相似文献