广丰盆地早白垩世火山-侵入杂岩稀土元素地球化学特征及成因探讨

江西广丰早白垩世盆地火山-侵入杂岩稀土元素地球化学特征表明,本区火山-侵入杂岩可能是一套具有成因联系的岩石系列,杂岩中基性岩可分出稀土特征不同两类岩石,中酸性岩石亦可分出稀土特征不同两类的岩石,其中(橄榄)玄粗岩与钾长斑岩、橄辉粗玄岩与花岗斑岩稀土元素标准化曲线和稀土元素特征参数具有相似性。这些信息对揭示本区早白垩世基性岩浆的底侵作用具有重要的启迪意义。     

洞庭湖流域水生态系统服务功能经济价值研究

以洞庭湖流域水生态系统为例,在明确河湖库塘生态系统服务功能内涵的基础上,运用生态学与生态经济学方法对洞庭湖流域各类水生态系统服务功能经济价值进行了评估。结果表明,全流域河湖库塘水生态系统服务功能总价值量为1106.19亿元,约占湖南省2004年GDP(5612.26亿元)的19.7%,其中,城镇和农村生活供水、工农业生产供水、水力发电、内陆航运等直接利用价值为415.698亿元;调洪、输沙、水资源贮存等间接利用价值为690.492亿元。可以认为,流域水生态系统服务功能对湖南省工农业生产的持续发展,维系生态环境健康和人民生命财产安全起到了不可替代的支撑和保障作用。     

关于迪庆香格里拉发展旅游产业集群的探讨

当代的国际经济竞争是产业集群的竞争。产业集群现象的大量出现以及成功的发展实践，为欠发达地区实现跨越式发展提供了一条新的发展之路。旅游业的综合性显示着产业集群的优势条件，旅游产业集群化发展是区域旅游业竞争力提升的有效模式。近几年来中国许多地方的旅游业呈现出产业集群化发展趋势，展现了旅游产业集群在区域竞争中的优势。通过运用波特的钻石体系分析了在迪庆香格里拉这样的欠发达地区发展旅游产业集群的有利条件以及面临的问题，并由此提出了香格里拉发展旅游产业集群的对策。     

福建开展森林人家休闲健康游的探讨

通过对国内开展乡村旅游现状的调研,分析了目前福建开展乡村旅游存在的问题,借鉴川、渝、浙等地乡村旅游"农家乐"的成功经验,结合福建依托森林资源特色开展森林人家的主要措施,对如何进一步提升森林人家品牌进行了探讨.     

2006年甘肃文县5.0级地震灾害损失评估

2006年6月21日在甘肃省文县发生MS5.0地震,造成了建筑物破坏及人员伤亡。在震后开展的地震现场考察与震害评估工作中,将灾区分为2个评估子区,完成了29个点的震害抽样调查工作,根据地震灾害损失评估系统EDLES2.5的要求建立了有关数据库,做出了经济损失评估,并针对灾害特点给出了灾区恢复重建的建议。     

Study on snowmelt runoff simulation in the Kaidu River basin

Alpine snowmelt is an important generation mode for runoff in the source region of the Tarim River basin, which covers four subbasins characterized by large area, sparse gauge stations, mixed runoff supplied by snowmelt and rainfall, and remarkably spatially heterogeneous precipitation. Taking the Kaidu River basin as a research area, this study analyzes the influence of these characteristics on the variables and parameters of the Snow Runoff Model and discusses the corresponding determination strategy to improve the accuracy of snowmelt simulation and forecast. The results show that: (i) The temperature controls the overall tendency of simulated runoff and is dominant to simulation accuracy, as the measured daily mean temperature cannot represent the average level of the same elevation in the basin and that directly inputting it to model leads to inaccurate simulations. Based on the analysis of remote sensing snow maps and simulation results, it is reasonable to approximate the mean temperature with 0.5 time daily maximum temperature. (ii) For the conflict between the limited gauge sta-tion and remarkably spatial heterogeneity of rainfall, it is not realistic to compute rainfall for each elevation zone. After the measured rainfall is multiplied by a proper coefficient and adjusted with runoff coefficient for rainfall, the measured rainfall data can satisfy the model demands. (iii) Adjusting time lag according to the variation of snowmelt and rainfall position can improve the simulation precision of the flood peak process. (iv) Along with temperature, the rainfall increases but cannot be completely monitored by limited gauge stations, which results in precision deterioration.     

An equal area conversion model for rasterization of vector polygons

Vector-raster conversion is one of the classic research topics in the field of Geographical Information Systems (GIS). The algorithms commonly used in GIS are devoted to maintaining the vector polygons' shape characteristics, but neglect the gain and loss of a polygon's area, which is another important attribute. This paper proposes an equal-area conversion model based on an area compensation optimization principle. According to the topological relationship among polygons and boundary grids, a neighborhood compensation principle was adopted to assign the attributes of boundary grids and a global optimization algorithm was developed to minimize area distortion in the whole data set. Two experiments were designed and the results indicated that this algorithm not only guaranteed the area error is as small as possible, but also has the advantage as being adaptive to polygon shape and spatial structure.     

拟合推估新解之一——两步解法

拟合推估的一般模式AmnmZ BrnrY=L Δ（1）通常用双拟合法则（2）求解，它有一定的缺陷^[1] 。本文提出一种解法，分为2步：1、将Y项并入Δ，在单拟合下求X的优估值X。2、把X项纳入L，Y作确定未知量，也在单拟合下求其估值Y。