面向CORS的精密定位服务中间件平台的设计

目前，卫星定位连续运行参考站网相关技术的应用与研究是测绘界研究的热点之一，国内外各类CORS正相继建立。本文针对CORS服务体系的数据共享和服务共享问题，从软件工程角度对CORS的数据采集、处理、计算、分发、服务等方面作了进一步梳理，建立了较完备的网络体系和软件体系模型，提供了一个较完备的面向CORS的中间件平台设计思路。本文的设计成果和实践，可有效地改善当前CORS领域软件开发现状中软件和研究成果保密、软件功能单一、无统一的开发标准和架构模型等问题，具有一定的实用价值。     

武汉市排水地理信息系统安全问题的探讨

分析了武汉市排水地理信息系统的安全需求,提出了相应的安全解决方案,探讨了部分安全技术措施。     

Geochemical and statistical analysis of trace metals in atmospheric particulates in Wuhan, central China

The geochemical characteristics of trace metals (As, Cr, Co, Cd, Cu, Mn, Ni, Pb, V and Zn) in PM10 in Wuhan, the biggest metropolitan in central China, as well as their sources and contributions were analyzed. As PM10 has been the principal contaminant of air in Wuhan for years, concentrations of trace metals were measured in PM10 using high-volume samplers at one urban (Hankou) and one industrial (Changqian) site in Wuhan between September 2003 and September 2004. Based on the results, PM10 in Wuhan is characterized by relatively high levels of As, Cd, Mn, Pb and Zn compared with other Asian cities. The time-series of these elements indicated that As, Cu and Zn at both sites have similar trends, whereas Pb levels showed different patterns due to different emission sources. Factor analysis was applied to the datasets focusing on the apportionment of the mass of selected trace metals. Results indicate that Pb, Cd and As have a common source (smelting) at both sites, whereas the sources of Ni vary from coal combustion and steel in Changqian to mineral and traffic in Hankou.     

济南市长清区五峰山—张夏一带土壤元素与植物元素相关性分析

在济南市长清区五峰山-张夏一带选取植物样及相应的土壤样进行化验,采用线性回归的分析方法,计算出相关系数,判断其相关性,对此工作区农作物的适宜种植性具有指导作用。     

地勘单位用人问题管窥

针对某些地勘单位干部选拔及用人过程中存在的任人唯亲等不正之风问题,从“考察失真、关系利益、任用随意、责任层次不清”四个方面进行了根源剖析,并着重在“强化责任意识、严格考察程序、规范领导行为、完善监督机制”等方面提出了整改措施。     

超宽频带观测应用研讨会在北京召开

2007年9月26日,中国地震局监测预报司在北京主持召开了“超宽频带观测应用研讨会”。出席研讨会的监测预报司领导有监测预报司司长李克,处长余书明,余书明处长主持会议。中国工程院院士许绍燮到会演讲。会议承办方中国地震局地震研究所所长姚运生到会致词,龚平副所长到会。出席     

The impact of boundary on the fractional advection–dispersion equation for solute transport in soil: Defining the fractional dispersive flux with the Caputo derivatives

The inherent heterogeneity of geological media often results in anomalous dispersion for solute transport through them, and how to model it has been an interest over the past few decades. One promising approach that has been increasingly used to simulate the anomalous transport in surface and subsurface water is the fractional advection–dispersion equation (FADE), derived as a special case of the more general continuous time random walk or the stochastic continuum model. In FADE, the dispersion is not local and the solutes have appreciable probability to move long distances, and thus reach the boundary faster than predicted by the classical advection–dispersion equation (ADE). How to deal with different boundaries associated with FADE and their consequent impact is an issue that has not been thoroughly explored. In this paper we address this by taking one-dimensional solute movement in soil columns as an example. We show that the commonly used FADE with its fractional derivatives defined by the Riemann–Liouville definition is problematic and could result in unphysical results for solute transport in bounded domains; a modified method with the fractional dispersive flux defined by the Caputo derivatives is presented to overcome this problem. A finite volume approach is given to numerically solve the modified FADE and its associated boundaries. With the numerical model, we analyse the inlet-boundary treatment in displacement experiments in soil columns, and find that, as in ADE, treating the inlet as a prescribed concentration boundary gives rise to mass-balance errors and such errors could be more significant in FADE because of its non-local dispersion. We also discuss a less-documented but important issue in hydrology: how to treat the upstream boundary in analysing the lateral movement of tracer in an aquifer when the tracer is injected as a pulse. It is shown that the use of an infinite domain, as commonly assumed in literature, leads to unphysical backward dispersion, which has a significant impact on data interpretation. To avoid this, the upstream boundary should be flux-prescribed and located at the upstream edge of the injecting point. We apply the model to simulate the movement of Cl⁻ in a tracer experiment conducted in a saturated hillslope, and analyse in details the significance of upstream-boundary treatments in parameter estimation.     

Signatures of tectonic‐climatic interaction during the Late Cenozoic orogenesis along the northern Chinese Tian Shan

The Chinese Tian Shan is one of the most actively growing orogenic ranges in Central Asia. The Late Miocene‐Quaternary landscape evolution of northern Tian Shan has been significantly driven by the interaction between tectonic deformations and climate change, further modulated by the erosion of the upstream bedrocks and deposition into the downstream basins. In this study, only the accessible Kuitun River drainage basin in northern Tian Shan was considered, and detrital zircon geochronology and heavy minerals were analyzed to investigate the signature of the driving forces for Miocene sedimentation in northern Tian Shan. This study first confirmed a previously recognized tectonic uplift at ca. 7.0 Ma and further revealed that the basin sediments were mainly derived from the present glacier‐covered ridge‐crest regions during 3.3–2.5 Ma. It is suggested Late‐Pliocene to Early Pleistocene sedimentation was likely a response to the onset of the northern hemispheric glaciation. Although complicated, this study highlights that the tectonic‐climatic interaction during the Late Cenozoic orogenesis can be discriminated in the northern Chinese Tian Shan.     

基于OpenLayers的旅游地图方案研究

本文简要介绍国内最新旅游新闻动态,提出一种基于OpenLayers的多源数据整合方案,进行在线旅游地图服务,此方法定制方便灵活、开发简单,很适合中小型应用。     

城市变迁分析方法研究——以新昌县为例

建立了城市变迁分析指标体系,从经济、人口、城市空间3个维度分析城市变迁情况,同时以地图为载体,探讨城市变迁的可视化方法。以浙江省新昌县为例,分析新昌县的城市变迁历程。结果表明,新昌县城市人口基本维持稳定慢速增长,城市空间逐渐从外向扩张转变为内部结构调整,经济快速发展,二、三产业逐渐成为主力生产部门。同时搭建了新昌县城市变迁展示系统,从空间和时间两个轴动态展示新昌县变迁风貌。