检索结果-南通市图书馆

computer simulation of core filling process of cast high speed steel roll

在线全文

学校读者我要写书评

暂无评论

China Foundry 2009年第4期6卷 314-318页

作者： Song Nannan Luan Yikun Bai Yunlong Kang Xiuhong Xia Lijun Li Dianzhong Shenyang National Laboratory for Material Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Core filling process of cast high speed steel roll was *** iron was used as core *** influences of filling parameters,such as core filling time and core filling temperature,on the filling process were *** on the simulated results,optimal core filling parameters were *** predicted temperature fields show that the temperature at the roll shoulder is the lowest during the core filling process and usually causes binding defects *** for solving this problem was presented.

关键词： computer simulation high speed steel roll core filling binding layer

computer simulation to arc spraying

在线全文

学校读者我要写书评

暂无评论

China Welding 2004年第1期13卷 76-80页

作者：梁志芳李午申王迎娜 School of Material Science and Technology Tianjin University

The arc spraying process is divided into two stages: the first stage is atomization-spraying stream (ASS) and the second one is spraying deposition (SD). Then study status is described of both stages’ physical model and corresponding controlling-equation. Based on the analysis of study status, the conclusion as follows is got. The heat and mass transfer models with two or three dimensions in ASS stage should be established to far deeply analyses the dynamical and thermal behavior of the overheat droplet. The statistics law of overheated droplets should be further studied by connecting simulation with experiments. More proper validation experiments should be designed for flattening simulation to modify the models in SD stage.

关键词： computer simulation arc spraying physical model controlling equation future development

Co-Adsorption of CO in NO-CO Reaction on a Metal Catalytic Surface Studied by computer simulation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2009年第3期26卷 189-192页

作者： Waqar Ahmad Pakistan Institute of Nuclear Science and Technology P.O. Nilore Islamabad Pakistan

The effect of co-adsorption of CO molecules in the NO-CO reaction on a metal catalytic surface like Pt（001） is studied by applying the Langmuir-Hinshelwood mechanism using the Monte Carlo simulations. The system is investigated by two approaches of NO adsorption; dissociatively at two empty surface sites and molecularly at a single vacant site. The elementary steps are the same as those in the conventional Ziff-Gulari-Barshad model. With the additional reaction step of co-adsorption, the sustained production of CO2 is obtained, which has never been seen on a square lattice without introducing additional parameters. The most interesting result is the elimination of continuous second order phase transition, i.e. the production of CO2 starts as soon as the partial pressure of CO departs from zero, which is in accordance with the experimental observations. The effect of co-adsorption probability on the phase diagrams has also been studied.

关键词： ADSORPTION CARBON monoxide CHEMICAL reactions METAL catalysts COBALT NITRIC oxide SURFACE chemistry computer simulation

Studies on Insoluble Species of Gd(Ⅲ)in Human Blood Plasma by computer simulation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第4期17卷 352-355页

作者： WANG Yue LU Xing ZHANG Hai-yuan YANG Kui-yueNIU Chun-ji NI Jia-zuan Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022

The insoluble species of Gd ( Ⅲ ) in human blood plasma were investigated by computer simulation. The distribution of the Gd(Ⅲ ) species was obtained. It was found that most of the Gd( Ⅲ ) ions were bound to phosphate to form precipitate GdPO4 at the concentration of 1. 000 10-7 mol/L and when the concentration of the Gd (Ⅲ ) increased to 3. 750 X 10-4 mol/L, in excess of the concentration of phosphate, the Gd ( Ⅲ ) ions were bound to carbonate to form another kind of precipitate, Gd2(CO3)3.

关键词： Speciation Gadolinium ( Ⅲ ) computer simulation

computer simulation MODEL FOR ROOM DIFFUSE SOUND FIELD

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2000年第4期 45-50页

作者：葛坚石坚韧

With the development of computer simulation technique for room acoustics, diffuse reflection is considered more and more important. In this paper, some models are developed by considering two diffuse factors in a room\|diffuse reflection due to room surfaces and scattering due to objects. The surface diffusion is treated by two different methods on the basis of probability analysis or Energy Conservation Law, and the scattering among objects is simulated as a multiple random ray\|tracing process. Thus the sound pressure level distribution in a diffuse sound field can be calculated more precisely and easily. Agreement between the computer simulation results and measurements shows the accuracy of the mathematical and physical model and the applicability of the computer simulation methods. These models can be used in noise control engineering, as well as in the practice of acoustical design.

关键词： diffuse reflection room sound field computer simulation

computer simulation of the air flow distribution in goaf regarding the use of inert gases and chemical agents

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

西安科技大学学报 2011年第6期31卷 755-759页

作者： Waclaw Dziurzyfiski Stanislaw Nawrat Strata Mechanics Institute of Polish Academy of Sciences Krakow Poland AGH University of Science and Technology Krakow Poland

This paper presents the use of a computer method of the ventilation process simulation for the analysis of the flow distribution of air and gases in the area of wall mining work and the adjacent *** workings and goaf,the complex issue of the formation of a gaseous atmosphere under variable ventilation conditions and an existing fire hazard level,with the possibility of feeding goaf with an additional carbon dioxide flux as the inertizing agent is *** examples of the simulation of feeding goaf with carbon dioxide illustrating the different patterns of the distribution of the goaf atmosphere gases concentration,said distribution patterns being gas supply place dependent,have been *** addition,the impact of the additional sealing of goaf on the distribution level of the concentration of gases,the said sealing made from the wall side with chemical agents has also been *** capabilities of the VentGoaf computer simulation program,being the basis for our calculations,enable consideration of the use of the inert gases supplied to the goaf depending on: the location of the gas feeding the pipe outlet,tightness of the fire field,fire centre location,and spatial situation of the mined *** has been found that fire prevention elements,such as chemical sealing agents,are of great impact on the effectiveness of fire prevention.

关键词： mine ventilation computer simulation inflow of methane and inert gases

computer simulation OF GRAIN BOUNDARY SEGREGATION BEHAVIOR AND MECHANISMS OF STRENGTHENING OF Mg IN Ni-BASED SUPERALLOYS

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1995年第2期9卷 108+84-91页

作者：陈国良葛红林北京科技大学新金属国家重点实验室

This paper used EAM and static relaxation method to simulate the grain boundary segregation behavior of Mg in Ni-based superalloys. The results offer a better understanding in the strengthening mechanism of Mg addition in superalloys. The segregation of Mg increases the grain boundary cohesive bond and the vacancy formation energy, and decreases the mobility of grain boundary dislocation. It results in the retardation of creep voids initiation and growth.

关键词： Mg in Superalloys Grain boundary segregation superalloy computer simulation

computer simulation OF GRAIN BOUNDARY STRUCTURES IN Ni_3Al

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1990年第6期3卷 385-392页

作者： LIN Dongliang (T.L.Lin) CHEN Da Shanghai Jiaotong University,Shanghai,China Professor,Dept.of Materials Science,Shanghai Jiaotong University,Shanghai 200030,China

The embedded atom type potentials and static relaxation method combined with steepest gra- dient computational technique have been used to simulate the grain boundary cohesive ener- gies,the distribution of electron density and stress field in the grain boundary,region,and oth- er related problems of[100],[110]and[111]symmetric tilt grain boundaries in Ni_3Al with different grain boundary geometrical index and *** relations with the segrega- tion or boron,behaviors or the grain boundary,and especially the stoichiometrical effect of B induced ductility have also been studied and discussed.

关键词： Ni_3Al intermetallic compound grain boundaty structure computer simulation

Breeding design in wheat by combining the QTL information in a GWAS panel with a general genetic map and computer simulation

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2023年第6期11卷 1816-1827页

作者： Xiaobo Wang Weiwei Mao Yongfa Wang Hongyao Lou Panfeng Guan Yongming Chen Huiru Peng Jiankang Wang State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Frontiers Science Center for Molecular Design Breeding(MOE) Key Laboratory of Crop Heterosis and UtilizationKey Laboratory of Crop Genetic ImprovementCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Hainan Yazhou Bay Seed Laboratory Sanya 572025HainanChina National Nanfan Research Institute(Sanya) Chinese Academy of Agricultural SciencesSanya 572024HainanChina

A large amount of genome-wide association study(GWAS)panels together with quantitative-trait locus(QTL)information associated with breeding-targeted traits have been described in wheat(Triticum aestivum L.).However,the application of mapping results from a GWAS panel to conventional wheat breeding remains a *** this study,we first report a general genetic map which was constructed from 44 published linkage *** permits the estimation of genetic distances between any two genetic loci with physical map positions,thereby unifying the linkage relationships between QTL,genes,and genomic markers from multiple genetic ***,we describe QTL mapping in a wheat GWAS panel of 688 accessions,identifying 77 QTL associated with 12 yield and grain-quality *** these QTL have known physical map positions,they could be mapped onto the general ***,we present a design approach to wheat breeding by using known QTL information and computer *** crosses between parents in the GWAS panel may be evaluated by the relative frequency of the target genotype,trait correlations in simulated progeny populations,and genetic gain of selected *** is possible to simultaneously improve yield and grain quality by suitable parental selection,progeny population size,and progeny selection *** the design approach will allow identifying the most promising crosses and selection schemes in advance of the field experiment,increasing predictability and efficiency in wheat breeding.

关键词： Wheat breeding Breeding design GWAS panel General genetic map computer simulation