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A thermodynamic study on the Ti-bearing inclusions in the 17Cr stainless steel

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Baosteel technical research 2010年第4期4卷 37-44页

作者： LIANG Jianping1,2),JIANG Laizhu1),ZHAI Ruiyin1),YU Haifeng1)and CHANG E1)1)Stainless Steel Technology center,research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 200431,china 2)School of Materials Science and engineering,Shanghai University,Shanghai 200072,china Stainless Steel Technology center Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 200431 China School of Materials Science and engineering Shanghai University Shanghai 200072 China Stainless Steel Technology center Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 200431 China

In order to utilize the advantage of oxides in stainless steel,the formation of titanium nitride(TiN)and oxide(TixOy)in the 17Cr steel was investigated by the calculation of the free energy of reaction and thermodynamic calculation with Thermo-calc *** result indicates that the competitive reaction between the dissolved [O] and the dissolved [N] with the dissolved [Ti] in molten steel results in different precipitation sequences of TiN and *** primary precipitation of TiN requires a low [O] and the primary precipitation of TixOy requires a low [N].The increase of [Ti] causes a higher precipitation temperature of TiN and TixOy in both Ti-N and Ti-O alloy *** relations of [Ti] vs [N] and [Ti] vs [O] show that the solubility products fall with the decrease of the temperature,and then the precipitation of the inclusions becomes *** the Ti-O alloy system,a high [O] and a low [Ti] are favorable to the precipitation of Ti3O5,and a high [Ti] content and a low [O] favorable to the Ti2O3 precipitation.

关键词： stainless steel titanium inclusion precipitation thermodynamics

圆柱绕流滴灌灌水器构建及其水流特性的数值分析

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节水灌溉 2009年第11期 39-42页

作者：王新坤李亚飞于冰郑涵江苏大学流体机械工程技术研究中心江苏镇江212013 松辽委流域规划与政策研究中心长春130021 华能澜沧江水电有限公司云南大理675702

为了进一步了解圆柱绕流灌水器内部流动机理和外部水力性能,应用FLUENT软件对其内部流动及水力性能进行数值分析,发现水流在流道单元内存在明显的主流区和涡漩区,主流区水流紊动强烈。对150个流道单元的数值计算结果显示,每个流道单元... 详细信息

为了进一步了解圆柱绕流灌水器内部流动机理和外部水力性能,应用FLUENT软件对其内部流动及水力性能进行数值分析,发现水流在流道单元内存在明显的主流区和涡漩区,主流区水流紊动强烈。对150个流道单元的数值计算结果显示,每个流道单元的压降为630 Pa,流道的流态指数为0.527,100 kPa工作压力时的流量为1.76L/h。初步研究结果表明,圆柱绕流流道过流断面大,水流紊动强烈,消能效果良好,抗堵塞性能强,具备构建性能良好的滴灌灌水器的条件。

关键词：圆柱绕流突扩突缩滴灌灌水器数值模拟

Parameter-Dependent Robust H∞ Model Reduction for Discrete-Time Switched Polytopic Linear Systems

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Parameter-Dependent Robust H∞ Model Reduction for Discrete-...

第二十六届中国控制会议

作者： Qiu Jianbin1,Feng Gang2,Yang Jie3 1.Department of Manufacturing engineering and engineering Management,University of Science and Technology of china (USTC) & City University of Hong Kong (CityU) Joint Advanced research center,Suzhou 215123,P.R.china2.Department of Manufacturing engineering and engineering Management,City University of Hong Kong,Hong Kong,P.R.china3.Department of Precision Machinery and Instrumentation,University of Science and Technology of china,Hefei,230026,P.R.china

This paper investigates the problem of parameter-dependent robust H∞ model reduction for a class of discrete-time switched linear systems with polytopic parameter *** objective is to design a parameter-dependent homogeneous reduced-order switched system to approximate a given switched polytopic linear system such that the resulting error system is asymptotically stable with a guaranteed H∞ performance γ for any switching *** on a switched parameter-dependent quadratic Lyapunov function （SPDQLF） combined with Finsler’s Lemma,a novel sufficient condition in terms of a set of lin- ear matrix inequalities （LMIs） for robust H∞ performance analysis is first proposed and in turn the reduced-order models are *** is shown that by using a new linearization technique incorporating a bounding technique,the matrices for the reduced-order models can be obtained by solving a set of linear matrix inequalities,which are numerically efficient with com- mercially available ***,a numerical example is provided to illustrate the effectiveness and less conservatism of the proposed approaches.

关键词： Switched linear systems Model reduction Polytopic uncertainties Switched parameter-dependent Lyapunov func- tions Linear matrix inequalities

Aircraft Category Based Genetic Algorithm for Aircraft Arrival Sequencing and Scheduling

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Aircraft Category Based Genetic Algorithm for Aircraft Arriv...

第二十九届中国控制会议

作者： MENG Xiangwei1,ZHANG Ping1,LI Chunjin2 1 School of Automation Science and Electrical engineering,Beihang University,Beijing 100191,P.R.china2 research center of Air Traffic Control,Beihang University,Beijing 100191,P.R.china

Aircraft arrival sequencing and scheduling（ASS）at airports,which is an NP-hard problem,is a major issue in dailyair traffic control（ATC）*** effort has been made to tackle this problem using genetic algorithms（GAs） whose chromosomes are the permutation of the order of each aircraft in the arriving *** paper attempts to design an efficient GA whose chromosomes are constructed as the permutation of the categories of the arriving *** advantage of the resulting GA is the reduced encoding space so that the searching efficiency is promoted,which is very important for its real time *** extensive comparative simulation study shows that this novel aircraft category based GA outperforms the aircraft order based GAs.

关键词： Air Traffic Control Arrival Sequencing and Scheduling Genetic Algorithms Scheduling

State Feedback Controller Design of Networked Control Systems With Multiple Packet Dropouts

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State Feedback Controller Design of Networked Control System...

第二十九届中国控制会议

作者： ZHANG Changzhu1,FENG Gang1,GAO Huijun2,ZHAO Yan2 1.Department of manufacturing engineering and engineering Management,City University of Hong Kong,Kowloon,Hong Kong,P.R.china2.Space Control and Inertial Technology research center,Harbin Institute of Technology,Harbin,Heilongjiang Province,150001,P.R.china

This paper presents a kind of controller design method for a class of networked control systems（NCSs）with multiple packet dropouts,where the number of consecutive packet dropouts is limited by a known upper bound.A novel model that can be used to describe multiple packet dropouts in both sensor-to-controller and controller-to-actuator sides is provided.A sufficient condition for mean-square asymptotic stability is derived for the closed-loop networked control system,which is dependent on the upper bound of the packet dropouts *** corresponding state feedback control law is presented in terms of linear matrix inequalities（LMIs）.A networked control system for an inverted pendulum is finally provided to show the effectiveness and applicability of the proposed method.

关键词： LMIs Mean-square stability Networked control systems Packet dropouts

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三峡文物考古数字化展示技术及应用研究

系统仿真学报 2008年第S1期20卷 441-443,447页

作者：胡军强谈国新郭士礼古锐华中师范大学教育信息技术工程研究中心湖北武汉430079 华中师范大学信息技术系湖北武汉430079

通过对当前数字考古技术的分析,结合三峡考古的特点,设计了三峡文物数字化展示的技术应用构思,运用三维建模、三维大地形、虚拟摄影棚等多媒体技术实现三峡文物考古数字化展示;基于这些技术应用的示例,本文对这些技术在数字考古方面的... 详细信息

通过对当前数字考古技术的分析,结合三峡考古的特点,设计了三峡文物数字化展示的技术应用构思,运用三维建模、三维大地形、虚拟摄影棚等多媒体技术实现三峡文物考古数字化展示;基于这些技术应用的示例,本文对这些技术在数字考古方面的应用作了一些研究,最后提出了一些想法。

关键词：数字考古三维建模技术三维大地形技术虚拟摄影棚技术

A New Virtual Path Allocation Scheme for ATM Networks

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A New Virtual Path Allocation Scheme for ATM Networks

亚太地区通信会议暨光电子通信会议

作者： Lan Julong Wu Jiangxing Li OuNational Digital Switching System engineering & Technological research center P.O. Box: 1001-NDSC, Zhengzhou, china, 450002,

This paper proposes an efficient adaptivebandwidth allocation scheme of virtual *** of a virtual path is dynamically adjustedaccording to the link residual *** schemecan remarkably reduce the load on node processingand simplify the network architecture,while keepinghigher transmission *** excellent perfor-mance is proved by detailed theoretical analyses.

关键词：

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喷雾热分解法制备氧化锆纤维的过程研究

无机材料学报 1998年第3期13卷 401-406页

作者：周晓东古宏晨 ZHANGSC 华东理工大学技术化学物理研究所 DepartmentofCeramicengineering UniversityofMissouri-RollaMO65401USA

本文研究了喷雾热解法制备氧化锆纤维的过程．用醋酸氧锆为前驱体能够制备出直径1～2μm、长度1～5cm的氧化锆纤维．研究了前驱体溶液浓度、表面张力、粘度对产品形貌的影响．通过控制操作条件，可以得到实心或空心纤维．

关键词：氧化锆纤维喷雾热分解无机纤维

The Design and Application of Hybrid Intelligent Control System for Rotary Kiln Process in Alumina Production

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The Design and Application of Hybrid Intelligent Control Sys...

第二十六届中国控制会议

作者： Wu Yongjian 1,2,Tan Minghao3,Zhou Xiaojie 1,Chai Tianyou 1 1.research center of Automation,Northeastern University,ShenYang 110004,P.R.china2.Information engineering College,Shenyang Institute of Chemical Technology,ShenYang 110021,P.R.china3.Information engineering College,Shenyang University of Technology,ShenYang 110023,P.R.china

This paper describes the successful application of a hybrid intelligent control system to perform the real time control of rotary kiln for alumina *** hybrid intelligent control strategy is explained with special emphasis on the adaptive fuzzy control and rule-based expert *** hybrid intelligent control software package was developed based on the DCS *** software package has been found to provide good economic benefits in its successful application in a real rotary kiln process.

关键词： hybrid intelligent control adaptive fuzzy control rule-based expert control the rotary kiln