Mathematical Model of Combustion in Blunt Annular Ceramic Burner

Symbol L ist　　A—— oxidant flow;　　c1 ,c2 —— constant of the k- ε urbulent model;　　 cg1 ,cg2 —— constant of the turbulent combustion model;　　f—— mixture fraction;　　 f,- f—— value of mixture fraction;　　 fu— fuel;　　F—— fuel flow;　　g—— concentration fluctuation;　　 H—— enthalpy,J;　　k—— kinertic energy for turbulent,m2 / s2 ;　　ma—— mass fraction of material a;　　 ox—— oxidant;　　 r,θ,z—— coordinate axis for cylinder coordinatesystem;　　 s—— equ…     

劣质粉煤灰的改性激活及高强度粉煤灰砌块的研究

介绍以劣质为主要原料,制备高强度粉煤灰硅酸盐砌块的研究成果。研究表明,采用磨细、添加化学性物质以及水热合成反应条件等激活方法可以提高粉煤灰的反应活性,进而显著提高粉煤灰砌块的早期强度。本文还对影响粉煤灰砌块强度的诸因素进行讨论,并根据粉煤灰结构特性,阐述激发方法和制备因素对粉煤灰砌块强度影响的作用机理。     

吊车梁制作工艺优化及变形控制

在实践经验的基础上 ,介绍了大型吊车梁制作工艺过程 ,包括下料、制孔、拼装与焊接等 ,及其工艺要领和控制焊接变形的具体措施     

应力场、渗流场、流场耦合系统问题

三场耦合系统问题,即应力场、渗流场、流场耦合问题,是实际工程中经常会遇到的问题,至今还没有得到很好地解决。本文参照Sandhu和钱伟长的成果,建立三场耦合问题的分析方法。该分析方法是解决三场耦合系统问题的一般性理论方法,为该问题的解决提供了理论基础。     

广州地铁盖挖逆筑公园前车站钢管混凝土框架节点抗剪性能试验研究

本文对广州地铁盖挖逆筑公园前车站钢管混凝土框架节点的抗剪性能作了试验研究,包括３个１：５模型的静载试验和１个１：２模型的动载试验。研究得出：（１）该节点上钢管混凝土柱的钢管与核心混凝土的界面没有粘结摩擦力,节点不是由此摩擦力传递剪力,节点抗剪主要由下柱的局部承压承担。（２）钢管材质为３号钢时,公园前车站梁、柱节点的极限抗剪能力约是设计荷载（剪力）的４倍;而公园前车站钢管柱的钢管为１６Ｍｎ钢,其屈服强度高于３号钢,因此该节点的极限抗剪能力将大于４倍的设计荷载（剪力）。（３）列车运行产生的循环荷载对节点抗剪性能影响很小。     

改进的整体变分法在图像修复中的应用

提出了一种改进的整体变分法并且将其应用于图像修复中。在修复的过程中考虑图像破损区域外部参考像素和待修补点的相关度,再利用图像破损区外部参考像素信息从破损区域的边缘逐步地向破损区域内部进行扩散,从而达到图像修复的目的。仿真试验表明,改进后的算法与原方法相比图像边缘过渡更加自然,修复效果得到改善。     

Synthesis of carbon micro-rods via a solvothermal route

Novel carbon micro-rods with regular and uniform shape have been synthesized in high yield by magnesium acetate and n-butyl alcohol as the precursors via a solvothermal route. The resulting products were characterized by combined techniques including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) and Raman spectroscopy. The carbon micro-rods exhibit diameters ranging from 500 nm to 1 μm and up to 5-10 μm in length. We have found that the optimal reaction conditions for the growth of the carbon micro-rods were 500 °C and 12 h.     

Fabrication of titania thin film with composite nanostructure and its ability to photodegrade rhodamine B in water

A titania nanorod film was synthesized by direct oxidation of metallic Ti with hydrogen peroxide solution under a low temperature. Titania nanoparticles were then filled into the gaps among the nanorods through an infiltration sol-gel procedure to form a composite titania film with an ordered nanostructure. X-ray diffraction spectra indicate that the composite film was a mixture of anatase and rutile while the titania film obtained by only using a sol-gel procedure was pure anatase. Field emission scanning electron microscopy observations show that titania nanoparticles were embedded into the titania nanorod film. Photoluminescence spectra suggest the enhanced separation of electron and hole pairs for the obtained composite titania film over the corresponding titania nanorod film. The composite titania film exhibited improved ability to photodegrade rhodamine B in water compared with the titania nanorod film. The apparent photodegradation rate constant, fitting a pseudo-first-order, was 3 times of that obtained by the sol-gel derived titania film at the same weight. The improved photocatalytic activity for the composite titania film could be attributed to the enhanced separation of electron and hole pairs due to the embedding of the titania nanoparticles within the titania nanorods.     

支持多金属的矿产资源储量估算方法研究

支持多金属的矿产资源储量估算系统,是资源储量快速估算与动态管理的基础,也是"数字矿山"和"数字国土"工程建设的一个重要工具.根据我国传统资源储量估算方法的特点,对支持多金属的矿产资源储量估算系统实现方法进行了探讨,并以QuantyMine矿产资源勘查与开发软件中实现的垂直剖面法矿产资源储量估算子系统为例,阐述了支持多金属的矿产资源储量估算系统实现过程.     

矿井局部风量与总风量调节

在矿井通风网络中,风量的自然分配往往不能满足作业地点的风量需求,需要对风量进行调节。矿井风量调节的措施多种多样,按其调节的范围,可分为局部风量调节与矿井总风量调节。局部风量调节的方法有增阻法、减阻法及辅助通风机调节法;矿井总风量的调节采取的措施是:改变主通风机的工作特性,或改变矿井风网的总风阻。