新矿物—盈江铀矿

新矿物产于云南盈江县的一个铀矿点氧化带,与多种铀矿物共生。该矿物为致密状集合体,黄色,透明至半透明。斜方晶系,空间群C222_1,晶胞参数a=13.73(1),b=15.99(1),c=17.33(2);V=3804(5);Z=8。计算比重4.17。二轴晶负光性,2V计算=83°,α=1.669;β=1.692;γ=1.710。紫外光照射发弱绿黄色荧光。化学成分UO_376.54,P_2O_511.10,K_2O 2.46,CaO 1.57,ThO 0.51,RE_2O_3 0.45,H_2O 7.37%。矿物化学式为(K_(1-x),Ca_x)(UO_2)_3 (PO_4)_2 (OH)_(1+x)·4H_2O,文中还给出X射线粉晶衍射数据。     

大数据时代的国土资源档案创新管理研究

在大数据时代,以广东省国土资源档案集群服务平台建设为例,以“档案数据大集中、应用系统大集群、档案服务大平台”为总体工作思路,提出了“一个中心,两个集群、三个统一、四位一体”的国土档案管理一揽予解决方案,并对基于大数据的国土资源档案知识服务进行了初步研究,为我国国土资源档案行业在大数据时代信息化建设提供极具实践意义的经验。     

建议一个弥补震害资料不足的方法

本文用模糊贴近度原则作类比,提供了一种弥补震害预测时历史地震资料不足的方法,途径是将一个烈度之下的震害经验推广到其他烈度上去用。实践证明,用这种建立在近似推理基础之上的方法推导出来的结果,在总体趋势上和真实情况完全一致。     

Effects of an ecological conservation and restoration project in the Three-River Source Region,China

The first-stage of an ecological conservation and restoration project in the Three-River Source Region (TRSR), China, has been in progress for eight years. However, because the ecological effects of this project remain unknown, decision making for future project implementation is hindered. Thus, in this study, we developed an index system to evaluate the effects of the ecological restoration project, by integrating field observations, remote sensing, and process-based models. Effects were assessed using trend analyses of ecosystem structures and services. Results showed positive trends in the TRSR since the beginning of the project, but not yet a return to the optima of the 1970s. Specifically, while continued degradation in grassland has been initially contained, results are still far from the desired objective, ‘grassland coverage increasing by an average of 20%–40%’. In contrast, wetlands and water bodies have generally been restored, while the water conservation and water supply capacity of watersheds have increased. Indeed, the volume of water conservation achieved in the project meets the objective of a 1.32 billion m³ increase. The effects of ecological restoration inside project regions was more significant than outside, and, in addition to climate change projects, we concluded that the implementation of ecological conservation and restoration projects has substantially contributed to vegetation restoration. Nevertheless, the degradation of grasslands has not been fundamentally reversed, and to date the project has not prevented increasing soil erosion. In sum, the effects and challenges of this first-stage project highlight the necessity of continuous and long-term ecosystem conservation efforts in this region.     

基于SFTP的GNSS数据采集软件的设计与实现

本文首先对GNSS数据产品服务平台的建设背景及其系统设计框架进行概述,进而介绍了平台的关键组成模块——GNSS数据采集软件。因GNSS数据采集要求安全可靠,调研后引入了SFTP安全文件传输技术,并开展了基于SFTP技术的采集软件方案的设计与实现。该方案保证了数据采集的简便、稳定和安全,为服务平台的整体建设与运行提供了有效保障。     

A note on the algorithm of symplectic integrators

For a Hamiltonian that can be separated into N+1(N\geq 2) integrable parts, four algorithms can be built for a symplectic integrator. This research compares these algorithms for the first and second order integrators. We found that they have similar local truncation errors represented by error Hamiltonian but rather different numerical stability. When the computation of the main part of the Hamiltonian, H ₀, is not expensive, we recommend to use S ^* type algorithm, which cuts the calculation of the H ₀ system into several small time steps as Malhotra(1991) did. As to the order of the N+1 parts in one step calculation, we found that from the large to small would get a slower error accumulation. This revised version was published online in July 2006 with corrections to the Cover Date.     

土地利用结构与社会经济结构——基于中国不同用地类型区域的实证分析

应用简单相关分析、典型相关分析以及聚类分析等方法,选取1999-2007年中国31个省市(除港澳台地区)的面板数据,对全国及不同用地类型区域的土地利用结构与社会经济结构的关系进行实证分析.研究表明,我国土地利用结构与社会经济结构的相互影响关系显著,产业结构的升级以及土地利用结构的优化相互作用,并对中国社会经济发展具有显著贡献:土地利用结构与社会经济结构的关系具有显著的区域差异性,基于不同用地类型区域的分析有助于二者量化关系规律的进一步显化:相应的政策含义是,土地宏观调控政策应与产业政策相协调,并兼具宏观政策和区域政策的双重特点.     

成都花卉塑料薄膜大棚热量平衡初探

本文在测量的基础上,对热量平衡各分量在大棚内、外的差异,进行了比较与分析,对大棚生产管理有重要参考价值。     

综合物化探方法在深冲矿区铀多金属矿勘探中的应用

通过研究深冲铀矿区γ能谱铀异常、氡浓度异常特征和激电异常特征,探索矿区范围岩体、断裂构造和蚀变带与物化探信息显示特征的关系。据此,结合矿区地质特征,总结物化探方法应用效果,矿致异常综合特征。