自然过程碳排放数据信息WebGIS

作为自然过程碳排放数据信息管理系统建设的重点内容,自然过程碳排放研究数据WebGIS系统的构建成为了本文的研究对象.该系统以Silverlight为客户端平台,以ArcGIS Server作为系统GIS服务器,结合WCF RIA Service、ArcGIS API for Silverlight等WebGIS技术进行了系统的框架结构和空间数据库的设计,给出了系统属性数据和空间数据的组织和Web访问策略,实现属性数据的网络动态查询、检索、统计和分析与空间数据的网络地图展示、空间分析和专题图制作等功能.在系统构建过程中,重点分析了其涉及的WebGIS关键技术和解决方案的具体实施.研究表明,基于Silverlight技术和ArcGIS Server平台构建的WebGIS系统,不仅能解决地理空间数据的发布与管理,快速高效进行系统功能的开发,同时还能满足用户对系统高交互性和响应时间的要求,并提高WebGIS系统的表现力.     

An ICPSO-RBFNN nonlinear inversion for electrical resistivity imaging

To improve the global search ability and imaging quality of electrical resistivity imaging(ERI) inversion, a two-stage learning ICPSO algorithm of radial basis function neural network(RBFNN) based on information criterion(IC) and particle swarm optimization(PSO) is presented. In the proposed method, IC is applied to obtain the hidden layer structure by calculating the optimal IC value automatically and PSO algorithm is used to optimize the centers and widths of the radial basis functions in the hidden layer. Meanwhile, impacts of different information criteria to the inversion results are compared, and an implementation of the proposed ICPSO algorithm is given. The optimized neural network has one hidden layer with 261 nodes selected by AKAIKE's information criterion(AIC) and it is trained on 32 data sets and tested on another 8 synthetic data sets. Two complex synthetic examples are used to verify the feasibility and effectiveness of the proposed method with two learning stages. The results show that the proposed method has better performance and higher imaging quality than three-layer and four-layer back propagation neural networks(BPNNs) and traditional least square(LS) inversion.     

Spindle-shaped microfluidic chamber with uniform perfusion flows

The reaction chamber is important due to its wide applications. Based on the idea of the bionics, a novel spindle-shaped chamber (S-chamber) for microfluidics was designed to provide uniform flow and eliminate stagnant corners for microchannels. The computational fluid dynamics simulation results demonstrate that these S-chambers have a better performance compared to the conventional diamond-shaped chambers. An S-chamber with the optimized shape, which consists of a rectangle reaction region interfaced to the inlet/outlet channel through an expansion region with smooth arc edges, was fabricated by micromolding of polydimethylsiloxane. This S-chamber was fixed into a microreactor and mounted horizontally on a synthesizer for biochemical reactions. Solvent perfusion experiments and synthetic optimization experiments for in situ synthesis of peptide nucleic acids microarray were performed. The experimental results indicate that the newly designed and fabricated S-chamber provides excellent homogeneous perfusion flows. This type of S-chamber is designed for the most convenient fixation in the horizontal direction, without the need to consider the complicated effect caused by other housing directions. It has a wide application for cell culturing, microarray synthesis, gene hybridization, and many other microfluidic system-based techniques requiring uniform flow conditions.     

基于PPP技术监测高层建筑风致动态响应

针对GPS精密单点定位(PPP)技术的诸多优点,将其应用到高层建筑风致动态监测中。通过对实际工程监测数据的分析,得出PPP监测动态变形新方法与已有的GPS差分法和传统的加速度器法在高层建筑模态参数识别及振动变形监测方面具有良好的数值一致性。研究表明PPP技术在大型构筑物健康变形监测中具有可行性及应用前景。     

Effect of CuSO4 on the Hydromechanical Behavior of Compacted Tailings

Laboratory tests, including compressibility, permeability, and microstructure tests, were conducted on tailings samples using custom-designed test apparatus to investigate the effect of metal contamination (Cu²⁺) on the hydromechanical behavior of compacted tailings. Infiltrating samples with various dry densities with distilled water or CuSO₄ solution at various concentrations showed that the void ratio of compacted tailings decreased with increased dry density. An increase in the metal contaminant concentrations from 0 to 0.1 mol/L increased the compression coefficient of the tailings from 0.14 to 0.84 MPa^?1 under a vertical load of 0.01 to 2.0 MPa, while the yield stress of the tailings decreased from 204.3 to 98.7 kPa, respectively. The linear relationship between permeability coefficient (k) and void ratio (e) is described by k?=???6.48?+?17.17e. Microstructure test results showed that the diffusion double layer thinned, and the surface potential decreased, indicating that the contaminant of Cu²⁺ enhanced the compressibility and permeability of the tailings. The microstructure test results also showed that the amount of fine-grained soil in the copper tailings was significantly less after the hydromechanical test. Therefore, the permeability and compressibility of copper tailings increased. The experimental results are in good agreement with the estimated results.

     

湖南水口山矿田与3号隐伏岩体有关的铁多金属矿床地质特征及找矿标志

在湖南常宁水口山矿田中部,新近发现了一个隐伏的夕卡岩型铁多金属矿床。该矿床产于3号隐伏花岗岩体接触变质交代蚀变破碎带中,受控于倒转背斜、花岗闪长岩体超覆体、栖霞组灰岩与当冲组砂页岩构成的接触带"三角地带",共伴生有铁、铜、铅、锌、银、金和铀。围岩蚀变组合复杂,其中石榴子石—透辉石—透闪石夕卡岩化、角岩化、硅化、大理岩化与成矿关系密切。矿床类型为接触交代成因的夕卡岩型。这一新类型矿体的发现,为水口山矿田隐伏矿体的找矿突破提供了新的方向与空间(隐伏岩体超覆体下接触变质交代带)。     

基于二维高密度电阻率数据的二、三维反演对比(英文)

目前高密度电阻率法所采用的数据处理方法主要是将地质结构体视为二度体进行二维处理,因而二维数据资料处理结果只是一种近似解释,其计算精度与反演效果达不到精确反演的要求。设计两种典型的电阻率异常地质体模型,利用有限单元法进行正演计算。为更真实地模拟实测数据并分析二维、三维反演算法对噪声的敏感度,在正演剖面中加入1%的高斯随机误差,然后再分别利用最小二乘法进行高密度电阻率法二维、三维反演。对比二维和三维高密度电阻率法的反演水平切片及垂直切片图可知,三维反演受高斯随机误差的影响更小,反演结果在模型异常位置、形态和电阻率特性反映上都比二维反演的效果更好,与实际地质模型更接近。     

从氰化尾渣衍生物制备标准铅、锌精矿的新工艺

以氰化尾渣衍生物为原料,制备标准铅、锌精矿。采用X体系在常压下进行氧化浸出,研究浸出电位、氧化剂、总酸量、试剂A、试剂B、浸出时间和浸出温度对锌回收率、锌精矿品位以及铅浸出率的影响。结果表明:采用二段浸铅与气液固强化浸出相结合的方法在高效气液固反应器中进行实验,其最优条件如下:试剂A量15.6 g/L,试剂B量90 g/L,液固比L/S=10:1,鼓氧量1.5 L/min,浸出温度70℃,每段浸出时间均为3 h。所得铅精矿和锌精矿氧量品位分别高达75.49%和45%,副产品硫磺的品位达到99%,其中,铅、锌总回收率分别为90.68%和99%,单质硫的回收率高达99.1%。