检索结果-内蒙古大学图书馆

Sulfidation of a Novel Iron Sorbent Supported on Lignite Chars during Hot Coal Gas Desulfurization

Physics Procedia 2012年 24卷 290-296页

作者： Fengkui Yin Jianglong Yu Sushil Gupta Shaoyan Wang Dongmei Wang Li Yang Arash Tahmasebi Key Laboratory of Liaoning Province for Advanced Coking Technology School of Chemical Engineering University of Science and Technology Liaoning Anshan (114051) China Key Laboratory of Coal-Based Fuels for Aviation and Thermal Energy Research Centre Shenyang Aerospace University Shenyang (110136) China SMART@UNSW School of Materials Science & Engineering UNSW Sydney NSW 2052 Australia

The sulfidation behavior of novel iron oxide sorbents supported using activated-chars during desulfurization of hot coal gases has been studied. The sulfidation of the char-supported sorbents was investigated using a fixed-bed quartz reactor in the temperature range of 673K to 873K. The product gases were analyzed using a GC equipped with a TCD and a FPD detector. The sorbent samples before and after sulfidation were examined using SEM and XRD.

关键词： Hot coal gas desulfurization char-supported Fe sorbents sulfidation IGCC poly-generation

来源：评论

学校读者我要写书评

暂无评论

Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

引用

International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

来源：评论

学校读者我要写书评

暂无评论

Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

引用

Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analysis on Characteristics of Fly Ash from Coal Fired Power Stations

引用

Energy Procedia 2012年 17卷 3-9页

作者： Jianglong Yu Xianchun Li David Fleming Zhaoquan Meng Dongmei Wang Arash Tahmasebi Key laboratory of Coal-Based Fuels for Aviation School of Power and Energy Engineering Shenyang Aerospace University Shenyang (110136) P.R. China Key Laboratory of Liaoning Province for Advanced Coking Technology School of Chemical Engineering University of Science and Technology Liaoning Anshan Liaoning (114051) China Newcastle Innovation Ltd Newcastle University Callaghan NSW 2308 Australiad Liaoning Fu-an Group Anshan Liaoning (114051) China

The paper studied the characteristics of fly ash samples from two power stations, focusing on cenospheres and superfine ash particles. Sieving tests and floatation tests were performed in the lab. Chemical composition, PSD, structure, morphology and cross-section structure of fly ash samples were analyzed using XRF, XRD, SEM, Laser Sizer.

关键词： Fly ash cenosphere morphology

来源：评论

学校读者我要写书评

暂无评论

Research on fractional order controller based on best rational approximation approach

引用

Journal of Convergence Information technology 2012年第4期7卷 50-58页

作者： Zhao, Huimin Nie, Bing Li, Wen Deng, Wu Software Institute Dalian Jiaotong University Dalian 116028 China Key Laboratory of Numerical Simulation in the Sichuan Provincial College Neijiang Normal University Neijiang 641112 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong 643000 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing 400044 China Key Laboratory of advanced Design and Intelligent Computing Dalian University Ministry of Education Dalian 116622 China

Introduce the basic concept of best rational approximation and constructing procedure of the best rational approximation function in Laplace domain. By an illustrative example the design method of FOC based on best rational approximation is discussed. The performance comparison of transfer functions between the FOC obtained by best rational approximation method and conventional PID shows that it is effective to apply the method in design of FOC, which can guarantee maximum absolute error of amplitude frequency characteristic of approximation function in a given error tolerance.

关键词： Rational functions

来源：评论

学校读者我要写书评

暂无评论

The structural stabilities and electronic properties of orthorhombic and rhombohedral LaGaO3: a first-principles study

The structural stabilities and electronic properties of orth...

引用

UK-China Symposium of New Energy Materials and Nanotechnology(2012年中英纳米技术和新能源材料研讨会)

作者： Q.G.Song Q.G.Du L.L.Song H.Zhao Y.R.Guo Institute of Low Dimensional Materials and Technology College of Science Civil Aviation University of China Tianjin 300300 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Institute of Advanced Materials Physics Faculty of Science Tianjin University Tianjin 300072China Institute of Low Dimensional Materials and Technology College of Science Civil Aviation University of China Tianjin 300300 China College of Science Hebei University of Technology Tianjin 300130 China

来源：评论

学校读者我要写书评

暂无评论

Estimation method for random sonic fatigue life of thin-walled structure of a combustor liner based on stress probability distribution

引用

航空动力学报 2011年第4期26卷 727-734页

作者： SHA Yun-dong GUO Xiao-peng LIAO Lian-fang XIE Li-juan Liaoning Key Laboratory of Digital Technology Simulation and Test Technique College of Power and Energy Engineering Shenyang Aerospace University Shenyang 110136 China Shenyang Aeroengine Research Institute Aviation Industry Corporation of China Shenyang 110015 China

As to the sonic fatigue problem of an aero-engine combustor liner structure under the random acoustic loadings,an effective method for predicting the fatigue life of a structure under random loadings was ***,the probability distribution of Von Mises stress of thin-walled structure under random loadings was studied,analysis suggested that probability density function of Von Mises stress process accord approximately with two-parameter Weibull *** formula for calculating Weibull parameters were *** on the Miner linear theory,the method for predicting the random sonic fatigue life based on the stress probability density was developed,and the model for fatigue life prediction was *** an example,an aero-engine combustor liner structure was *** power spectrum density(PSD) of the vibrational stress response was calculated by using the coupled FEM/BEM(finite element method/boundary element method) model,the fatigue life was estimated by using the constructed *** considering the influence of the wide frequency band,the calculated results were *** analysis shows that the estimated results of sonic fatigue of the combustor liner structure by using Weibull distribution of Von Mises stress are more conservative than using Dirlik distribution to some *** results show that the methods presented in this paper are practical for the random fatigue life analysis of the aeronautical thin-walled structures.

关键词： thin-walled structure sonic fatigue life estimation probability density function(PDF) power spectrum density(PSD)

来源：评论

学校读者我要写书评

暂无评论

Research on the estimation and reduction measures of antenna mode RCS of airborne phased array

Research on the estimation and reduction measures of antenna...

引用

2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2011

作者： Liu, Yun You, Lizhi Aviation Key Laboratory of Science and Technology on Avionics Integrated Sensor System Simulation Radar and Avionics Institute of AVIC Wuxi China

ISBN: (纸本)9781424482665

In this paper, the scattering principium of airborne phased array antenna is discussed, and the antenna mode RCS of the two-dimensional array is estimated. Based on theoretical calculations, broadband matching, incline, manufacturing tolerances and other RCS reduction measures are researched. The results show that these stealth approaches have an obviously effect on the RCS reduction. © 2011 IEEE.

关键词： Antenna arrays Antenna radiation patterns Arrays Phased array RCS reduction measures Radar antennas Reflector antennas Scattering airborne phased array antenna airborne radar antenna mode RCS estimation antenna mode scattering antenna mode scattering antenna phased arrays broadband antennas broadband matching electromagnetic wave scattering manufacturing tolerances phased array radar radar cross-sections reduction two-dimensional array

来源：评论

学校读者我要写书评

暂无评论

Existence and stability of multiple solutions to the gap equation

引用

Physical Review D 2012年第11期86卷 114001-114001页

作者： Kun-lun Wang Si-xue Qin Yu-xin Liu Lei Chang Craig D. Roberts Sebastian M. Schmidt Department of Physics Center for High Energy Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Institut für Kernphysik Forschungszentrum Jülich D-52425 Jülich Germany Argonne National Laboratory Physics Division Argonne Illinois 60439 USA Department of Physics Illinois Institute of Technology Chicago Illinois 60616-3793 USA Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany

We argue by way of examples that, as a nonlinear integral equation, the gap equation can and does possess many physically distinct solutions for the dressed-quark propagator. The examples are drawn from a class that is successful in describing a broad range of hadron physics observables. We apply the homotopy continuation method to each of our four exemplars and thereby find all solutions that exist within the interesting domains of light current-quark masses and interaction strengths; and simultaneously provide an explanation of the nature and number of the solutions, many of which may be associated with dynamical chiral symmetry breaking. Introducing a stability criterion based on the scalar and pseudoscalar susceptibilities we demonstrate, however, that for any nonzero current-quark mass only the regular Nambu solution of the gap equation is stable against perturbations. This guarantees that the existence of multiple solutions to the gap equation cannot complicate the description of phenomena in hadron physics.

关键词： NONLINEAR integral equations HOMOTOPY equivalences HADRON interactions PARTICLES (Nuclear physics) -- Chirality STABILITY criterion

来源：评论

学校读者我要写书评

暂无评论

Twin boundary spacing-dependent friction in nanotwinned copper

引用

Physical Review B 2012年第5期85卷 054109-054109页

作者： Junjie Zhang Yujie Wei Tao Sun Alexander Hartmaier Yongda Yan Xiaodong Li Center for Precision Engineering Harbin Insitute of Technology Harbin 150001 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) Ruhr University Bochum Stiepeler Strasse 129 (UHW) D-44801 Bochum Germany Department of Mechanical Engineering University of South Carolina 300 Main Street Columbia South Carolina 29208 USA

The deformation mechanisms of nanotwinned Cu subjected to nanoscratching are investigated by means of molecular dynamics simulations. Scratching simulations on nanotwinned single-crystalline Cu with the twin planes parallel and perpendicular to the scratching direction are performed. Since the detwinning mechanism is completely suppressed in the former case, no apparent correlation between frictional coefficient and the twin spacing is observed. In samples where the twin planes are perpendicular to the scratching direction, the friction increases as the twin spacing decreases, and then decreases as the twin spacings become even smaller. It results from the competitive plastic deformation between the inclined dislocations and the detwinning mechanism. Subsequent simulations for nanotwinned polycrystalline Cu unveil that in addition to the grain-boundary-associated deformation mechanism, dislocation-mediated detwinning plays a significant role in the plastic deformation of nanotwinned Cu. The twin boundary spacing in turn affects nanotwinned materials to resist scratching via plastic deformation. We demonstrate via the nanoscratching tests that there exists a critical twin boundary spacing for which the friction coefficient is maximized and that this transition results from the competing deformation mechanisms in those nanotwinned materials.

关键词： FRICTION COPPER MOLECULAR dynamics PLASTICITY POLYCRYSTALS DEFORMATIONS (Mechanics) DISLOCATIONS in crystals CRYSTALLOGRAPHY

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：