计算机辅助测量料堆体积的三角区域法

提出了在计算机辅助测量料堆体积中一种新的体积计算算法，包括：整理原始数据 点、求原始数据点的偏导数、建立三角剖分、区域曲面拟合、计算区域体积、计算料堆体积等步 骤．在算法的基础上，开发出一个应用系统，并通过试验验证了算法的正确性．

RTK和TPS在矿料堆体积测量中的对比分析

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提高爆堆体积计算精度的新方法

本文利用Ｌａｇｒａｎｇｅ多项式曲面模拟自然地表或爆堆的轮廓，用解析的方法计算土石方工程的开挖量。具有体积计算精度高。便于计算机程序化等优点。

基于三维激光扫描技术爆堆体积测量与计算

针对目前新兴发展的三维激光测量技术,结合露天矿山采场爆堆测量体积计算工作,形成了一套基于三维激光扫描技术的采场爆堆体积测量和计算的方法。介绍了基于三维激光扫描技术的测量原理以及在爆堆体积量算中的应用,并讨论了点云数据采集、预处理、三维建模及爆堆体积计算流程。通过工程实例,与传统的全站仪数据采集方式进行对比分析,基于三维激光扫描技术在爆堆体积计算满足精度要求。此技术对爆堆体积测量与计算具有实际应用价值和推广价值。

利用断面法计算机辅助测量料堆的体积

把工程中使用的断面法引入到计算机辅助测量技术中,提出了在计算机辅助测量料堆体积中一种新的体积计算算法,它包括整理原始数据点、建立三角剖分、建立截断面、对断面进行曲线拟合、计算断面体积(或计算相邻截面间料堆的体积)、计算料堆体积等步骤。在此算法的基础上,开发出一个应用系统,并通过实验验证了算法的正确性。

激光雷达扫描技术在堆料体积智能测量中的应用研究

为解决拌合站的库存管理自动化程度低和管理低效的问题,文章提出了一种基于激光雷达扫描技术的堆料体积智能测量应用研究。该应用通过行走小车搭载激光雷达扫描仪来获取仓库所有库位堆料的三维点云数据,建立堆料的三维模型并计算体积。这种测量方式不仅效率高,而且精度可靠,为拌合站的库存管理提供了可靠的技术手段。

激光测量在水泥原料堆场盘存中的应用

针对水泥厂盘存原材料堆场时,存在精度低、效率不高的问题,采用有轨小车搭载激光雷达的方法实现料堆的自动化测量,在现场实验验证了方案的可行性。

依靠技术进步提高有色冶炼企业金属平衡管理水平

叙述了金属平衡管理工作中检验、盘点存在的问题,指出要提高金属平衡管理水平必须依靠技术进步,有色冶炼企业在新建或实施技术改造过程中应把金属平衡管理的要素融入到项目设计和规划之中。

3D characterization and analysis of pore structure of packed ore particle beds based on computed tomography images

Methods and procedures of three-dimensional （3D） characterization of the pore structure features in the packed ore particle bed are focused. X-ray computed tomography was applied to deriving the cross-sectional images of specimens with single particle size of 1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10 ram. Based on the in-house developed 3D image analysis programs using Matlab, the volume porosity, pore size distribution and degree of connectivity were calculated and analyzed in detail. The results indicate that the volume porosity, the mean diameter of pores and the effective pore size （d50） increase with the increasing of particle size. Lognormal distribution or Gauss distribution is mostly suitable to model the pore size distribution. The degree of connectivity investigated on the basis of cluster-labeling algorithm also increases with increasing the particle size approximately.

三维激光扫描技术在爆破工程中的应用

随着现代测绘体系的不断丰富,三维激光扫描技术以其高精度、高效率、非接触式和信息丰富等特点在各领域内得以广泛应用,在爆破工程领域中也得到了长足发展,本文对矿山爆破工程中三维激光扫描技术的应用状况开展探讨,阐述主要的应用形式,并分析现有研究存在的问题提出未来可行的研究趋势。

Numerical Simulations of Structural Deformation and Fluid Flow in Xiangshan Deposit

The Xiangshan deposit in Jiangxi province is one of the most important uranium deposits in China. The aim of this study is to achieve a better understanding of mineralization in the Xiangshan deposit through numerical simulation. In order to find the most favorable locations of mineralization and to help further mineral exploration, a coupling deforma- tion and fluid flow model has been established to describe the mineralization process. In this model, the simulation re- constructs the strata deformations under fields of compressive stress and thrust structure on the hanging wall of the Zou-Shi fault. Compared with practical information, the simulation results are consistent with the No. 51 exploration section of the western Xiangshan. In addition, on the basis of geological information provided by previous investigators, the model simulates the flow process of fluids under compressive stress fields. The result suggests that many tensional areas are formed, which can help the fluid flowing upward from deeper parts. The fluid is easy to concentrate on the breccia fractured zone between two volcanic layers, especially on the intersection parts with faults, resulting in the for- mation of favourable locations of mineralization. In addition, the model is significant in guiding the exploration of ura- nium deposits in the western Xiangshan and provides clues for further exploration of deposits.

Construction of a 3D meso-structure and analysis of mechanical properties for deposit body medium

For deposit body medium, the internal structural properties may be the controlling factors for the strength of the material and the mechanical response. Based on the results of soil-rock meso-statistics using digital imaging, a simulated annealing algorithm is adopted to expand the meso-structural features of deposit bodies in 3D. The construction of the 3D meso-structure of a deposit body is achieved, and then the particle flow analysis program PFC3 D is used to simulate the mechanical properties of the deposit body. It is shown that with a combination of the simulated annealing algorithm and the statistical feature functions, the randomness and heterogeneity of the rock distribution in the 3D inner structure of deposit body medium can be realized, and the reconstructed structural features of the deposit medium can match the features of the digital images well. The spatial utilizations and the compacting effects of the body-centered cubic, hexagonal close and face-centered packing models are high, so these structures can be applied in the simulations of the deposit structures. However, the shear features of the deposit medium vary depending on the different model constructive modes. Rocks, which are the backbone of the deposit, are the factors that determine the shear strength and deformation modulus of the deposit body. The modeling method proposed is useful for the construction of 3D meso-scope models from 2D meso-scope statistics and can be used for studying the mechanical properties of mixed media, such as deposit bodies.

Optical Properties of WO3-PbO Tellurite Glasses Doped with Rare Earths

The tellurium-based glasses TeO2, 85TeOz-15WO3, 85TeO2-10WO3-5Sm203, 77TeO2-20WO3-3Y203, 77TeO2-20WO3-3La203, 65TeO2-33WO3-2Er203 and 49TeO2-29.4WO3-19.6PbO-2Er203 have been prepared by melt quenching technique. Density and molar volume have been measured for the present glasses. Optical absorption studies are carried out on the glass system in the wavelength range of 200-900 nm. The compositions depend on different physical parameters such as density, molar volume and oxygen packing density will be discussed. Also, molar refraction （RM）, calculated refractive index （n）, metallization criterion （M）, electronic polarizability of the oxide ion （to2＂（Eopt） and optical basicity A^opt have been determined.

Synthesis and Crystal Structure of [Ni(C_5H_2N_2O_4)(2,2'bipy)(H_2O)_2]·H_2O

The crystal structure of [Ni(C5H2N2O4)(2, 2?bipy)(H2O)2]?H2O 1 has been determined by X-ray diffraction. Crystal data: triclinic system, space group P with a = 7.9424(3), b = 9.9417(3), c = 12.1867(3) ? a = 84.771(1), b = 77.375(2), g = 68.993(2)? C15H18N4O8Ni, Mr = 440.7, V = 876.16(5) 3, Z = 2, Dc = 1.672 g/cm3, F(000) = 456, m(MoKa) = 1.162 mm-1, the final R = 0.0464 and wR = 0.1055 for 3026 observed reflections with I > 2s(I). In the title compound, the nickel ion is coordinated by a nitrogen atom and an oxygen atom from the orotate ligand, two nitrogen atoms from 2, 2?bipy and two oxygen atoms from the coordinated water molecules in a distorted octahedral geometry. The presence of intermolecular hydrogen bonding and p-p stacking interaction of aromatic rings from 2, 2?bipy results in a 3D structure.

Numerical Simulation of Countercurrent Flow in a PWR Hot Leg by Using Two-Fluid Model

In order to evaluate CCFL （countercurrent flow limitation） characteristics in a PWR （pressurized water reactor） hot leg under reflux condensation, numerical simulations have been conducted using a 2F （two-fluid） model and a VOF （volume of fluid） method implemented in the CFD （computational fluid dynamics） software, FLUENT6.3.26. The 2F model gave good agreement with CCFL data in low pressure conditions but did not give good results for high pressure steam-water conditions. In the previous study, the computational grid and schemes were improved in the VOF method to improve calculations in circular tubes, and the calculated CCFL characteristics agreed well with the UPTF （Upper Plenum Test Facility） data at 1.5 MPa. In this study, therefore, using the 2F model and the computational grid previously improved for the VOF calculations, numerical simulations were conducted for steam-water flows at 1.5 MPa under PWR full-scale conditions. In the range of medium gas volumetric fluxes, the calculated CCFL characteristics agreed well with the values calculated by the VOF method and the UPTF data at 1.5 MPa. This indicated that the reference set of the interfacial drag correlations employed in this study could be applied not only to low pressures but also to high pressures.

A Ternary Ruthenium（II） 2,2′ ：6′,2″-Terpyridine Complex Having Intramolecular Tr-Tr Stacking Interaction with Ancillary Benzyl Groups of the Mixed Ligand

A new ruthenium（II） complex with two different types oftridentate ligands was synthesized, 2,2′：6′,2″-terpyridine （tpy） and 2,6-Bis（（N-benzyl）aminomethyl）pyridine （bbap）： [Ru（tpy）（bbap）]2＋ （1）. This compound was designed to form intramolecular π-π stacking interaction between tpy and substituted benzyl groups of bbap. The single-crystal X-ray diffraction analysis revealed that 1 crystallized with orthorhombic space group Aea2 and the ruthenium center has a distorted octahedral coordination geometry with fully chelated tpy and bbap ligands. Simultaneously, in the crystal structure of 1, the central part of ligating tpy was stacked and sandwiched with a pair of capped benzyl substituent groups of bbap, the nearest atomic distance being N...C = 3.28 A.

Folate and cell penetrating peptide modification effects on penetration behavior of nanostructured lipid carriers using multicellular tumor spheroids

Surface modification may have important influences on the penetration behavior of nanoscale drug delivery system. In the present study, we mainly focused on whether cell targeting or cell penetration could affect penetration abilities of nanostructured lipid carriers（NLC）. Real--time penetration of folate--or cell penetrating peptide（CPP）-modified NLC was evaluated using a multicellular tumor spheroid（MTS） established by stacking culture method as an in vitro testing platform. The results suggested that CPP modification had a better penetration behavior both on penetration depth and intensity compared with folate-modified NLC at the early stage of penetration process.

Estimation of thermophysical properties of solid propellants based on particle packing model

A method for the estimation of thermophysical properties of two-and multi-phase solid propellants is proposed in this paper.The theoretical solutions for thermal conductivity and specific heat of a homogeneous solid propellant cell in the transient thermal conductivity process are deduced on the condition that one boundary of the cell is heated while others are adiabatic.A homogenization theory and the finite element method are employed to compute the mean temperature and heat flux of a representative volume element(RVE).According to the mean results and the theoretical solutions,the effective thermal conductivity and specific heat of solid propellant can be estimated.A packing algorithm,considering the solid particles(ammonium perchlorate(AP)or aluminum)as spheres or discs,is used to match the size distribution and volume fraction of solid propellants,and some mesoscopic models of two-phase and three-phase solid propellants are established.According to the estimation theory proposed in this paper,the effective thermal conductivity and specific heat of solid propellants are predicted.The effect of AP or Al volume fraction is also discussed in this paper.