莱歇磨双物料粉磨连续转换的操作经验

0 引言传统的粉磨工艺是将矿渣与熟料混合入球磨机进行粉磨,当综合比表面积达到350m~2/kg时,水泥中的矿渣粉比表面积仅能达到270～280m~2/kg,矿渣粉的     

分割法在女装立体裁剪中的应用

文章通过分割法在女装立体裁剪中的应用,系统地阐述分割法特点及其种类,分割法立体裁剪造型工艺处理技术五原则,使之对分割类女装的设计、制作有一定的参考价值。以此希望能提高分割法在服装立体裁剪中运用的功效。     

开滦矿区厚松散层地表岩移参数规律研究

为了揭示厚松散层、岩层与地表移动的内在机理和规律,丰富和发展开采沉陷理论,应用数理统计原理整理和分析了大量的实测资料,采用概率积分法和最小二乘原理进行拟合求参,分析总结了相应的角量参数、概率积分法预计参数规律以及中采深厚松散层的特点.利用多元回归分析,得出了同一矿区虽然采厚变化不大,但松散层厚度对边界角、移动角的影响较为显著,且边界角和移动角相差很大,甚至可达20,°最后总结了目前控制和减轻地表沉陷的主要技术途径.这对研究开滦矿区厚松散层条件下地表岩移规律和开采沉陷问题具有重要指导意义和应用价值.     

基于EPGA的FIR滤波器设计与仿真

介绍了数字滤波器理论及其常见实 现方法的基础,提出了一种基于EPGA的高效实现方案''该方案采用对称结构,加法、乘法运算和级联技术,利EPGA 芯片Maxplus软件对该方案进行了仿 真验证。结果表明基于EPGA的实现方案速度快、实时性好%节省硬件资源,具有重要的工程应用价值。     

一种无线传感器网络匿名安全路由协议*

为了能在有限资源的无线传感器网络上进行安全的匿名通信,使用双线性函数的双线性对和异或运算提出了一种匿名安全路由协议,与目前现有的无线网络匿名通信方案相比,协议不仅能提供身份的机密性、位置隐私性和路由的匿名性,而且还满足前向和后向安全性,并且大大提高了系统的计算复杂度和带宽消耗,更适合无线传感器网络。     

反拱法碳纤维加固RC梁的数值模拟分析

采用动力设备将钢筋混凝土梁向上反拱一定的弧度,然后在梁的下部外贴碳纤维布（CFRP）,待碳纤维布养护完全后,卸载,此时后加的碳纤维布与原钢筋混凝土梁同时进入工作状态。作者采用分析软件ANSYS模拟此过程,通过与直接用碳纤维布加固RC梁进行比较,得出反拱法加固RC梁能有效提高其承载能力,对类似工程具有一定的借鉴意义。     

COREX预还原竖炉反应进程的物理模拟

COREX工艺主要由预还原竖炉和熔化气化炉两部分组成,预还原竖炉作为气-固逆流式反应器,炉内铁氧化物的还原情况至关重要,关系到整个流程的生产效益.本文通过建立1∶20的半圆周冷态模型,利用硅胶吸水逐渐变色的特性进行预还原竖炉内气-固反应进程的可视化模拟实验,测定了不同气体流量下填充床内铁矿石的还原情况.结果表明炉内径向铁矿石还原率相差较大,随着气体流量增大而炉内气-固反应进程加快,反应进程在轴向、径向上很不均匀.     

Constitutive model for shape memory alloy torsion actuator

Shape memory alloy ( SMA) torsion actuator is one of the key approaches realizing adaptive wings in airplanes. In this paper,the actuator is made up of SMA wires and a thin-walled tube,in which the SMA wires are twisted and affixed around the surface of the tube at an angle referenced to the center axis of the tube. A thermo-mechanical constitutive model is developed to predict the thermo-mechanical behaviors of the SMA torsion actuator based on the knowledge of solid mechanics. The relationship between the torsion-angle and tem- perature is numerically calculated by using the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. The numerical results are compared with the relative experimental results finished by Xiong and Shen. Influences of the twist-angle of SMA wires and geometrical factors on the primary actuation performances of the SMA torsion actuator are also numerically investigated based on the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. Results show that the thermo-mechanical constitutive model can well predict the thermo-mechanical behaviors of the SMA torsion actuator.     

Productivity of coalbed methane wells in southern of Qinshui Basin

Based on regional CBM geological characteristics and drainage data of three typical Coalbed Methane(CBM)wells in the southern Qinshui Basin,history matching,productivity prediction and factor analysis of gas production control are conducted by using COMET3 reservoir modeling software.The results show that in the next 20 years,the cumulative and average daily gas production of the QN01 well are expected to be 800×104 m3 and 1141.1 m3/d,for the QN02 well 878×104 m3 and 1202.7 m3/d and97.5×104 m3 and 133.55 m3/d for the QN03 well.Gas content and reservoir pressure are the key factors controlling gas production in the area; coal thickness,permeability and porosity are less important; the Langmuir volume,Langmuir pressure and adsorption time have relatively small effect.In the process of CBM recovery,the material source and driving force are the key features affecting gas productivity,while the permeation process is relatively important and the desorption process has some impact on gas recovery.     

水下轴向串列双圆柱体带空泡绕流研究

基于多相流理论,利用Fluent6.3对水下轴向串列双圆柱体带空泡绕流进行了数值模拟,分析了空泡形态和阻力特性与其结构参数的关系.结果表明:串列双圆柱体与单圆柱体相比,阻力系数降低;后圆柱体所受总阻力减小至几乎为零,前圆柱体承受了几乎全部的阻力;两圆柱体的间距和前端圆柱体的长度只影响超空泡的形成,前端圆柱体直径是影响阻力系数的主要因素.