断面法与TIN法在计算矿产资源储量中的对比讨论

在计算矿产资源储量的过程中,体积的计算方法一直广受关注。针对断面法与TIN法进行对比分析,研究两种方法的具体应用过程和适用情况区别,为今后矿产资源储量计算的方案选择提供参考和建议。

平原地区机载激光雷达数据的抽稀算法分析

目前,机载激光雷达点云数据在测绘行业中的应用还存在较多的瓶颈。为了使机载激光雷达点云数据更好地服务等值线等数据的生产,发挥其高效和高精度的优势,本文归纳、总结了国内外现有的LiDAR点云数据抽稀算法,并通过对比分析现有LiDAR点云数据抽稀算法存在的优缺点,如系统抽稀、格网抽稀、TIN抽稀和坡度抽稀等算法,结合平原地区激光点云在实际生产中的应用,研究了更适合平原地区点云数据的抽稀方法,通过大量的数据测试和试生产。结果表明,该方法可以在应用项目精度约束下保证数据质量,减少了后期数据处理应用的难度,提升了后续成果数据的质量,提高了作业生产效率,对机载激光雷达点云数据在测绘行业中的应用推广具有重要的现实意义。

A novel approach for evaluation of load bearing capacity of duplex coatings on aluminum alloy using PLS and SVR models

Duplex NiP/TiN coatings consisting of the electroless intermediate layers and the physical vapor deposition(PVD) top layers were fabricated on the AA6061 aluminum alloy in order to enhance the load bearing capacity. The main objective of this study was to model the load bearing based on the thickness, adhesion and elastic modulus of the coatings. For this purpose, partial least square(PLS) and support vector regression(SVR) approaches were employed.The results showed that both models had an acceptable performance;however, the PLS model outperformed SVR. The correlation coefficients between thickness, adhesion and elastic modulus with load bearing were 0.841, 0.8092 and 0.7657, respectively;so, thickness had the greatest effect on the load bearing capacity. The composition and structure of the samples were evaluated using XRD and SEM. The load capacity of the coated samples was also discussed based on the wear and adhesion evaluations. Dry sliding wear tests, under a load of 2 N and a sliding distance of 100 m,demonstrated the complete destruction of the coated specimens with low load capacity. The samples with high load capacity showed not only a superior tribological performance, but also a remarkable adhesion according to the Rockwell superficial hardness test.

地质构造三维可视化模型探讨

地质构造的三维可视化技术包括数学建模和可视化显示两方面。建立地质构造三维可视化模型的典型方法包括三维规则网格法、TIN表面法、四面体法以及综合法。针对地质构造模型中断层处理的特殊性 ,提出了基于TIN表面法的局部法和整体法两种处理技术。将地质构造三维模型的可视性归纳为 5种方式。

高精度土方工程量计算

土方工程是各项工程建设前期工作的主要项目之一,其主要目的是通过填挖土方使平整地块的平面位置和高程满足设计要求。由于受原始地形复杂多样、外业数据采集方法以及土方计算模型等因素影响,要得到精确的土方计算结果很困难。本文首先评述了各类土方计算原理和方法,分析了土方计算中存在的问题和当前土方计算软件存在的不足,然后提出了高精度土方计算的各类措施和方法。