地理信息公共服务平台的用户分类及服务分类

地理信息技术的发展经历了集中式、模块化、组件化的过程,目前正向地理信息的Web服务方向发展。传统的集中式地理信息系统中,功能的分类决定了用户的分类;而在地理信息服务的架构中,用户的分类导致服务的分类及其与用户分类的映射。本文从地理信息服务的架构出发,分析并提出了面向服务的地理信息公共服务的用户群分类与对应的服务分类,为地理信息公共服务平台的构建和地理信息服务资源的有效组织和整合提供理论依据。     

丹凤地区刘岭群倒转变质带及其地质意义

根据变质矿物组合和变质带的特征,结合变形构造研究,认为丹凤地区的刘岭群曾遭受过中压相系的变质作用,随后又被褶皱及剪切推覆作用改造,使变质带倒转、变薄。文章认为,本区刘岭群在时代上不能与西部邻区的中泥盆统地层对比。     

辽南早元古宙变质热液型金矿床成矿机理探讨

辽南早元古宙辽河群变质岩系中的金矿床为变质热液成因金矿床,矿床的形成与吕梁期变质变形作用关系密切。金矿化带的展布与金矿体的产出受韧性剪切带控制。剪切带内岩石具有明显的动态性组构特征,直接赋矿围岩为辽河群盖县组糜棱岩化千枚岩、变砂岩及云母石英糜棱岩等。韧性剪切带为含矿流体的运移提供通道。作者定义这类金矿床为变质热液型含金剪切带金矿床。     

The mass of the Andromeda galaxy

This paper argues that the Milky Way galaxy is probably the largest member of the Local Group. The evidence comes from estimates of the total mass of the Andromeda galaxy (M31) derived from the three-dimensional positions and radial velocities of its satellite galaxies, as well as the projected positions and radial velocities of its distant globular clusters and planetary nebulae. The available data set comprises 10 satellite galaxies, 17 distant globular clusters and nine halo planetary nebulae with radial velocities. We find that the halo of Andromeda has a mass of together with a scalelength of 90 kpc and a predominantly isotropic velocity distribution. For comparison, our earlier estimate for the Milky Way halo is Although the error bars are admittedly large, this suggests that the total mass of M31 is probably less than that of the Milky Way . We verify the robustness of our results to changes in the modelling assumptions and to errors caused by the small size and incompleteness of the data set.
Our surprising claim can be checked in several ways in the near future. The numbers of satellite galaxies, planetary nebulae and globular clusters with radial velocities can be increased by ground-based spectroscopy, while the proper motions of the companion galaxies and the unresolved cores of the globular clusters can be measured using the astrometric satellites Space Interferometry Mission ( SIM ) and Global Astrometric Interferometer for Astrophysics ( GAIA ). Using 100 globular clusters at projected radii 20 R 50 kpc with both radial velocities and proper motions, it will be possible to estimate the mass within 50 kpc to an accuracy of 20 per cent. Measuring the proper motions of the companion galaxies with SIM and GAIA will reduce the uncertainty in the total mass caused by the small size of the data set to 22 per cent.     

论秦岭造山带的成矿作用

对秦岭造山带区域成矿背景、矿床的时空分布、典型矿床矿田赋存部位、区域成矿元素地球化学背景、多重岩片控矿理论,构造成矿体系、成矿物质来源、矿床成因类型、矿床区域成矿模式进行了讨论,在对大量资料研究的基础上提出了新认识。最后指出秦巴地区进一步寻找大型矿床的地区。     

东秦岭回龙湾强应变带及其地质意义

东秦岭二郎坪群和石界河群之间发现了一条强应变带（称之为回龙湾强应变带）,呈ＮＮＷ—ＳＳＥ向延伸,面理置换强烈,韧性剪切变形特征明显,糜棱岩发育。该强应变带的发现表明,二郎坪群和石界河群之间既非不整合接触,也不是整合接触,而是断层接触关系。结合原岩建造、沉积环境和变质作用特征,作者认为二郎坪群和石界河群之间并非简单的地层学上的上下关系,而是两个近乎同时异地的变质地质体。     

论党的第二代领导集体对政治民主化的贡献

政治文明是社会主义社会政治现代化建设的重要目标,而政治民主化是政治文明发展的重要体现。党的第二代领导集体在社会主义政治民主化方面作出了重要贡献,即健全与完善了人民代表大会制度、党内民主制度以及基层民主制度,积极推动了中国社会主义政治文明的发展进程。     

辽宁省金矿成矿作用研究

辽宁省是我国重要的金矿产地之一。省内金矿可划分为岩浆热液型、陆相火山岩型、同韧性剪切变质热液型、变质—岩浆热液叠生型、砂砾岩型及河相冲积型（砂金矿）六种类型。金矿的形成与特定的地层、构造、岩浆岩密切相关。稳定同位素资料表明，金矿的成矿物质主要来源于古老的结晶基底——太古宙变质杂岩（第一矿源层）及早元古宙中浅变质岩（衍生矿源层）；含矿热液主要为岩浆水，变质水和大气水，且多为两种水的混合物；大气水在成矿作用中占有重要地位。金矿的成矿演化经历了太古代－早元古代矿源层及同韧性剪切变质热液金矿床、晚三叠纪－燕山早期岩浆热液及叠生型矿床及燕山晚期陆相火山岩型矿床三个形成阶段。     

Dark matter in dwarf spheroidals – II. Observations and modelling of Draco

We present stellar radial velocity data for the Draco dwarf spheroidal (dSph) galaxy obtained using the AF2/WYFFOS instrument combination on the William Herschel Telescope. Our data set consists of 186 member stars, 159 of which have good quality velocities, extending to a magnitude   V ≈19.5  with a mean velocity precision of ≈2 km s⁻¹. As this survey is based on a high-precision photometric target list, it contains many more Draco members at large radii. For the first time, this allows a robust determination of the radial behaviour of the velocity dispersion in a dSph.
We find statistically strong evidence of a rising velocity dispersion consistent with a dark matter halo that has a gently rising rotation curve. There is a <2 σ signature of rotation about the long axis, inconsistent with tidal disruption as the source of the rising dispersion. By comparing our data set with earlier velocities, we find that Draco probably has a binary distribution and fraction comparable to those in the solar neighbourhood.
We apply a novel maximum likelihood algorithm and fit the velocity data to a two parameter spherical model with an adjustable dark matter content and velocity anisotropy. Draco is best fit by a weakly tangentially anisotropic distribution of stellar orbits in a dark matter halo with a very slowly rising rotation law  ( v _circ∝ r ^0.17)  . We are able to rule out both a mass-follows-light distribution and an extended halo with a harmonic core at the 2.5 to 3 σ significance level, depending on the details of our assumptions about Draco's stellar binary population. Our modelling lends support to the idea that the dark matter in dwarf spheroidals is distributed in the form of massive, nearly isothermal haloes.