材料期刊网

Gas-particle Flow and Combustion Characteristics of Pulverized Coal Injection in Blast Furnace Raceway

ZHANG Shengfu , BAI Chenguang , WEN Liangying , et al

钢铁研究学报(英文版)

The two-dimensional steady-state discrete phase model for gas-particle flow and combustion of pulverized coal injection is established and solved to analyze gas-particle flow features and combustion characteristics of coal particles, as well as components concentration and temperature distribution of coal gas by using numerical simulation technology. The results show that a great deal of gas discharge on top of raceway away from tuyere, residence time of coal particles in the region of blowpipe and tuyere is 20 ms or so, 50 ms when its reach raceway boundary. The pressure is highest at the bottom of raceway, the maximal temperature is about 2423 K, the char combustion is mainly carried out in the raceway, and the maximum of char burnout rate attains to 3×10-4 kg/s.

关键词: blast furnace;raceway;pulverized coal injection;gas-particle flow;combustion

Chen系统的状态变量周期性反馈控制

李开明 , 李亚洲 , 冯维贵 , 林长

量子电子学报 doi:10.3969/j.issn.1007-5461.2007.05.014

采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.

关键词: 混沌 , Chen系统 , 不动点 , Lyapunov指数 , 反馈控制

第27卷B辑作者索引

金属学报

Volu扣ne 27SeriesB1991AUTHOR INDEX CCAO Guanghan(曹光旱)············……6一B科6CAo weijie(曹卫恋)..················……5一B32oCAO Yilin(曹益林)··················……6一B443CHANG Xin(常听)···············……1一B48CHE Guang邻n(车广灿)·············一6一B科0CHEN Erbao(陈二保)···············……6一B410CHEN Jia....

关键词:

SIF expressions for center cracked strip loaded by uniformly distributed stress acting on central portion of crack - Corrections of Chen's results - Response

International Journal of Fracture

关键词:

Ion sputter erosion in metallic glass-A response to "Comment on: Homogeneity of Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass" by L-Y. Chen, Y-W. Zeng, Q-P. Cao, B-J. Park, Y-M. Chen, K. Hono, U. Vainio, Z-L. Zhang, U. Kaiser, X-D. Wang, and J-Z Jiang J. Mater. Res. 24, 3116 (2009)

Journal of Materials Research

The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.

关键词: room-temperature

光谱和电化学方法研究黄芩素与核酸相互作用的机理

郭蒙 , 王淑敏 , 王佳丽 , 李丹 , 高庆宇 , 李丽敏

应用化学 doi:10.3724/SP.J.1095.2014.30232

在pH=3.22的NaAc-HAc溶液中,应用循环伏安法、方波伏安法、荧光光谱法、紫外可见光谱法和黏度法研究了黄芩素(BAI)与鲱鱼精子DNA(fsDNA)之间的相互作用,发现二者通过沟槽作用形成一电活性较高的复合物,fsDNA为BAI提供了一个低极性的疏水环境导致BAI的峰电流显著增强,增强的峰电流与fsDNA在7.0×10-8 ～7.0×10-6 g/mL浓度范围内呈正比,由此建立了一种测定核酸的新方法,检测限达到4.1×10-8 g/mL.

关键词: 黄芩素 , 核酸 , 电化学 , 沟槽作用

Improved Nonlinear Equation Method for Numerical Prediction of Jominy EndQuench Curves

SONG Yuepeng , LIU Guoquan , LIU Shengxin , LIU Jiantao , FENG Chengming

钢铁研究学报(英文版)

Without considering the effects of alloying interaction on the Jominy endquench curves, the prediction results obtained by YU Baihai′s nonlinear equation method for multialloying steels were different from those experimental ones reported in literature. Some alloying elements have marked influence on Jominy endquench curves of steels. An improved mathematical model for simulating the Jominy endquench curves is proposed by introducing a parameter named alloying interactions equivalent (Le). With the improved model, the Jominy endquench curves of steels so obtained agree very well with the experimental ones.

关键词: Jominy endquench curve;nonlinear equation method;alloying interaction parameter;computer simulation

基于二氧化碳封存的超临界两相流动的数值研究

高诚 , 胥蕊娜 , 陈黎 , 姜培学

工程热物理学报

格子Boltzmann方法(LBM)在计算复杂结构物理模型时具有独特优势并在模拟两相流动过程中能够高效清晰捕捉相界面.本文介绍了基于Shan-Chen多相模型的格子Boltzmann方法的理论成果以及基于二氧化碳封存的超临界两相流的模拟研究.结果表明,Shan-Chen模型在模拟两相流时符合Laplace定律,且两相层流时的速度分布和相渗曲线均与理论值吻合.二氧化碳封存过程中,较大的注入速率在提高二氧化碳残余俘获量的同时会降低其化学俘获量.

关键词: 二氧化碳封存 , 超临界两相流 , Shan-Chen模型

MgO掺杂对BaSrTiO3介质陶瓷性能的影响

曲远方 , 张连松 , 李远亮

稀有金属材料与工程

通过实验,研究了MgO掺杂对BaSrTiO3陶瓷介电性能的影响和机理.观察了样品的微观形貌,讨论了氧化镁在调整Ba1-xSrxTiO3铁电陶瓷的介电-温度特性的作用.结果表明,氧化镁掺杂对Ba1-xSrxTiO3系介质陶瓷产生了压峰和移峰作用.借助扫描电镜对所制得的样品进行了分析,氧化镁掺杂使Bai.SrxTiO3系介质陶瓷的结构细晶化.以实验结果和微观结构分析为依据探讨了氧化镁掺杂改性作用的机理.

关键词: Ba1-xSrTiO3 , 介电特性 , MgO , 掺杂

A molecular dynamics study of the structural change differences between Au-225 and Au-369 clusters on MgO surfaces at low temperature

Chinese Physics B

The differences in structural change between Au-225 and Au-369 clusters with their (111) facets supported on MgO(100) surfaces at 5 K are studied by using molecular-dynamics simulations with the atomic interchange potentials of the Au/MgO interface. The parameters are obtained from the ab initio energies using the Chen-Mobius inversion method. Analyses of the pair distribution functions show that the two Au clusters use different deformation processes to adjust the distances between the interface atoms, owing to the misfit between the atom distances among the clusters and the substrates. The local structural changes are identified by atomic density profiles.

关键词: interfaces;nanostructures;computer modelling and simulation;molecular;dynamics;local-structure changes;mgo(001) surface;au;adsorption;cu;nanoclusters;dimers;models;ag