Lateral extrusion along the Altyn Tagh Fault,Qilian Shan (NE Tibet): insight from a 3D crustal budget

The lithospheric strike‐slip Altyn Tagh Fault has accommodated hundreds of kilometres of displacement between the Qaidam and Tarim blocks since its Eocene reactivation. However, the way the deformation is accommodated in the Qilian Shan and further east remains uncertain. Based on 360 km of north‐eastward migration of the relatively rigid Qaidam block along the Altyn Tagh Fault and 3D isovolumetric balancing of the crustal deformation within the Altyn Tagh Fault–Qilian Shan system, we demonstrate that 250 ± 28 km (43.8–49.4%) of N20E directed crustal shortening and an additional ~250–370 km of eastward motion of the Qilian Shan crust must be accounted for by strike‐slip faulting in the Qilian Shan and crustal thickening in the Qinling area, as well as by extension in the adjoining North China block graben systems.     

基于航线的数码航摄影像可视化查询

针对数码航空摄影测量的特点,利用Java语言的Java3D开发工具包生成模拟的可视化航飞路线模型．利用Java3D的事件监听处理功能实现对航线模型的缩放、平移。单击航线模型上的曝光点可以实现对相应数字航摄影像的浏览,可以任意浏览整个测区的每一张影像．模型为整个数码航摄影像的处理过程提供便捷、高效的影像查询和浏览。     

经纬仪观测工作平台的建立

本软件项目于１９９７ 年底最后完成。提高了人卫系统各台站观测的自动化程度, 大幅度减少了观测员各种繁琐的数据处理工作。它包括ｅ －ｍａｉｌ 收发报, 数据采集和处理, 静态系统差测定等功能, 可应用于人卫系统的各个观测台站。     

直接消除电磁耦合的发送端去耦方法

针对频率域激电应用中的电磁耦合问题,提出了一种矩形波经低通滤波后放大输出并对大地供电的发送端去耦方法;建立了数学物理模型,通过调节低通滤波时间常数进行的仿真实验结果表明,本方法可以显著衰减接收回路耦合尖峰幅值,且时间常数越大耦合尖峰幅值越小,大于10 ms后衰减量增长缓慢.进一步以5 m收发距为例的仿真结果表明,本方法...     

积极推动“数字海南”建设

海南省具有得天独厚的发展优势,“数字地球”是实现整体可持续发展的重要保障,将有力推进全省信息化的进程,促进经济发展。     

Preliminary study on assessment of nutrient transport in the Taihu Basin based on SWAT modeling

With the Taihu Basin as a study area, using the spatially distributed and mechanism-based SWAT model, preliminary simulations of nutrient transport in the Taihu Basin during the period of 1995:_2002 has been carried out. The topography, soil, meteorology and land use with industrial point pollution discharge, the loss of agricultural fertilizers, urban sewerage, and livestock drainages were all considered in the boundary conditions of the simulations. The model was calibrated and validated against water quality monitoring data from 2001 to 2002. The results show that the annual total productions of nitrogen (TN) and phosphorus (TP) into Lake Taihu are 40000t and 2000t respectively. Nutrient from the Huxi Region is a major resource for Lake Taihu. The non-point source (surface source) pollution is the main form of catchment sources of nutrients into Lake Taihu, occupied TN 53% and TP 56% respectively. TN and TP nutrients from industrial point pollution discharge are 30% and 16%, and sewerage in both forms of point source and non-point source are TN 31% and TP 47%. Both the loss of agricultural fertilizers and livestock drainages from the catchment should be paid more attention as an important nutrient source. The results also show that SWAT is an effective model for the simulation of temporally and spatially nutrient changes and for the assessment of the trends in a catchment scale.     

塔里木河流域适应气候变化和人类活动的应对措施

自2001年开始实施塔里木河流域近期综合治理工程,提出了以强化流域水资源统一管理和调度为核心,以源流区节水改造和干流河道治理为重点进行综合治理,积极稳妥地进行经济结构调整,实施退耕封育保护,有效保护好现有天然林草植被.通过向塔里木河下游生态输水,干涸近30a的台特玛湖于2001年11月16日开始有水,使塔里木河下游绿色走廊得到初步复苏等,流域生态环境得到极大的恢复.然而,自2007年以来,塔里木河向下游输水已大为减少,仅能输水到中游,特别是2009年水文干旱,塔里木河干流断流达1 100km多,使下游绿色走廊再度陷入生态危机.为此,需要重新审视塔里木河流域的综合治理,从加强源流治理开始,来巩固干流治理成果.认真总结10a来治理经验与教训,针对人类活动和气候变化对源流与干流造成的影响程度,积极采取应对措施.     

Heavy-Rain expert-system realized by logical language prolog

This article, on the basis of the expert’s analyses and theories of the forecast of heavy-rain, summarizes a variety of the current instruments and methods of forecast and, according to the train of thought of the high-rank forecasters, distills their experiences in forecasting heavy-rain into an inference-tree of 106 junctures from which 101 rule-bases are derived. The logical calculation is automatically carried out with our introduced and developed PROLOG, one of the intelligent languagas by means of micro-computer. This process adopts the uncertain inferential method based on the theory of fuzzy sets, breaks through the limits of two-value logic and is characteristic of the thinking of human brain.     

基于土地利用变化的生态风险评价——以广西岑溪市为例

该文以1999年及2009年岑溪市土地利用数据为来源,在GIS的支持下,分析了10年来研究区内的土地利用变化的时空特点及其转化过程,结合土地利用综合指数、耕地垦殖指数、植被覆盖指数、景观破碎度指数评价了土地利用变化的生态风险。研究表明：研究区域内10年间土地利用类型发生了复杂的相互转换,其中林草地、建设用地和耕地为研究区内变化面积最大的3种土地利用类型;受经济快速发展和城市化进程加快的影响,土地利用的广度和深度不断增大,全市土地利用趋于破碎化,土地生态风险程度有所增加。     

New Study of Anshunsaurus huangnihensis Cheng, 2007 (Reptilia: Thalattosauria): Revealing its Transitional Position in Askeptosauridae

The skull of Anshunsaurus huangnihensis Cheng, 2007, especially the skull roof, is described in detail in this paper. Compared to other genera and species of Askeptosauroidea, Anshunsaurus huangnihensis has some important transitional characters from Askeptosaurus italicus to Anshunsaurus huangguoshuensis: the rostral length related to the skull length between Askeptosaurus italicus and Anshunsaurus huangguoshuensis; the postfrontal existing but distinctly reduced; the posterolateral process relatedly short and overlapping the parietal. The phylogenetic analysis weakly supports the evolutional progress from Anshunsaurus huangnihensis to Anshunsaurus huangguoshuensis. The skeletal ratios indicated that the node among the Askeptosauridae ingroup. The evolutional direction of Askeptosauridae should be from Askeptosaurus italicus to Anshunsaurus huangguoshuensis. The skeletal ratios indicated that the evolutional progress is Askeptosaurus italicus – Anshunsaurus huangnihensis – Anshunsaurus huangguoshuensis. In biogeography provinces, the Askeptosauroidea taxa from south China have a close relationship with those from western Tethys; however, Xinpusaurus from the Late Triassic is more related to those from the eastern Pacific.