一定分布模式下的最优Lp估计

观测数据在一定的分布模式下,需从理论上解决究竟用多大的ｐ值进行Ｌｐ估计（最优ｐ值的确定）,本文基于渐近方差整体最小的原则,给出了最优Ｌｐ估计的定义。观测数据中含有粗差（异常值）的扰动,其误差分布可视为污染分布,作者分析了最优ｐ值的大小,结果表明,若观测数据中含有不同大小、数量的粗差,为使Ｌｐ估计差最小,则ｐ将取［１．２,１．５］中的某一定值,Ｌｐ估计结果最优,此结论对测量数据处理具有一定的参考价值     

测绘科技发展的现状、趋势及思考

科学技术的发展,使测绘学的内涵发生了深刻的变化。要立足本省发展测缥,必须抓住机遇,扩大宣传,加速发展;同时要加速各项基础设施的建设,开拓市场;积极养素质的人才,以适应现代测 产业的需要。     

Main genetic types of Ni ore deposits in China and their relations to paleo-plate tectonics

So far three main genetic types of nickel deposit have been recognized in China: magmatic copper-nickel sulfide deposits, nickel deposits occurring in the crust of weathering, and sedimentary nickel deposits. On the basis of the geotectonic settings of intrusive bodies, their genetic types, and the way sulfides are concentrated, the copper-nickel sulfide deposits fall into two broad categories: deposits emplaced along paleolandmass edges and those in the mobile zones on the outside of paleolandmasses. They can further be divided into six sub-categories and then a variety of types. The magmatic copper-nickel sulfide deposits constitute one of the most important genetic types in China. Geological evidence shows that the individual ferruginous ultrabasic bodies intruding along paleolandmass edges are most favourable for Ni-mineralization. In the light of the paleo-structural analysis, the author has proposed three mechanisms with respect to the formation of Ni-bearing ultrabasic bodies.     

The Austrian node of the natural resources satellite remote sensing cloud service platform:examples of Sino-Austrian cooperation

The Austrian node of the Natural Resources Satellite Remote Sensing Cloud Service Platform was established in 2016 through a cooperation agreement between the Land Satellite Remote Sensing Application Center(LASAC),Ministry of Natural Resources of the Peoples Republic of China and the University of Vienna,Austria.Under this agreement panchromatic and multi-spectral data of the Chinese ZY-3 satellite are pushed to the server at the University of Vienna for use in education and research.So far,nearly 500 GB of data have been uploaded to the server.This technical note briefly introduces the ZY-3 system and illustrates the implementation of the agreement by the first China-Sat Workshop and several case studies.Some of them are already completed,others are still ongoing.They include a geometric accuracy validation of ZY-3 data,an animated visualization of image quick views on a spherical display to demonstrate the time series of the image coverage for Austria and Laos,and the use of ZY-3 data to study the spread of bark beetle in the province of Lower Austria.An accuracy study of DTMs from ZY-3 stereo data,as well as a land cover analysis and comparison of Austria with ZY-3 and other sensors are still ongoing.     

GPS高程转换系统的研究及其应用

主要就GPS高程转换进行研究，对二次曲面模型、多面函数模型、神经网络模型等进行了研究，研制开发了具有数据输入、编辑、计算、分析与输出功能的GPS高程拟合转换系统，最后通过实例计算分析，验证了该系统的可靠性与可行性。     

内蒙古中西部宝音图群云母片岩的变质P-T轨迹与锆石年代学研究

位于内蒙古中西部地区的宝音图群,主要由云母片岩、斜长角闪岩、石英岩和大理岩等组成。其中云母片岩中发育典型的巴罗式递增变质带,目前对于该递增变质带的研究非常薄弱。本文对宝音图群的云母片岩开展了系统的岩相学、矿物化学、相平衡模拟以及锆石U-Pb年代学的研究。岩相学研究结果显示,三个云母片岩样品具有不同的峰期矿物组合,分别为石榴子石+白云母+黑云母+斜长石+石英,十字石+白云母+黑云母+斜长石+钛铁矿+石英,石榴子石+蓝晶石+白云母+黑云母+斜长石+钛铁矿+石英。此外,样品LS93和LS07存在晚期红柱石的叠加。相平衡模拟研究限定三个云母片岩的峰期温度压力分别为：577℃、0.73 GPa, 620℃、0.78 GPa和670℃、0.8 GPa,具有递增型特征,其峰期温度压力指示的地热梯度为18～20℃/km,为典型的中压相系;此外,三个样品的P-T轨迹均显示早期升温升压直至峰期阶段,随后降温降压的顺时针型,反映地壳加厚和后期抬升的演化过程。云母片岩中的锆石发育典型的变质边结构,变质边的Th/U=0.004～0.02,锆石U-Pb年代学结果显示该变质年龄为398±6 Ma,代表峰期或近峰期阶...     

从工程实践浅析基桩高应变法检测承载力误差问题

高应变法检测是基桩检测技术的一种重要手段,但是该方法检测承载力存在误差,因此受到许多争议。本文以广东惠州地区两项工程的检测实践为例,分别采用前后两组不同拟合参数,对检测数据进行了承载力拟合计算,分别得出了前后两种不同的计算结果。并通过动、静两种方法的对比检测,分析了高应变法检测承载力误差产生的主要原因,粗略探讨了对高应变法检测的一些认识。     

西藏阿隆岗日-喜马拉雅地震带中段地震活动性的初步探讨

本文通过对阿隆岗日——喜马拉雅地震带中段地震活动性某些特征的初步研究,提出本地震带已积累了一个8级地震的能量。根据地震活动周期及迁移趋势来看,在其东缘,于1985年前后有可能发生7级以上地震的危险。     

多层基础隔震房屋结构在水平地震力作用下的振动传递

文章将周期结构原理与导纳方法结合起来，分析了带复合结构单元的有阻尼的有限周期系统的波传播和振动特性，得到了有限周期结构自振频率的一般表达式。