检索结果-南通市图书馆

Simulation research on monomer agglomeration of nonmetallic inclusions in steel with a diffusion limited aggregation model

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第2期13卷 117-120页

作者： Hong Li Linxin Ning Juan Wen Jiongming Zhang Yasushi Sasaki mitsutaka hino Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China ShouGang Research Institute of Technology Beijing 100041 China Department of Metallurgy Graduate School of Engineering Tohoku University Sendai 980-8579 Japan

The monomer agglomeration of nonmetallic inclusions was simulated with a diffusion limited aggregation （DLA） model of the fractal theory. The simulation study with a random two-dimensional diffusion was carried out. The results indicate that the DLA model can be used for the simulation of agglomeration behavior of the cluster-type inclusions. The morphology of clusters was observed with SEM and compared with the simulated agglomerates. The modelling procedure of the DLA model is applicable for the agglomeration process. The uncertainty of agglomeration process and the persuasive average agglomerative ratio was analyzed. The factors about the agglomerative ratio with the collision path distance and the size of particles or seed were discussed. The adherence of the nonmetallic inclusions on the dam, the weir and the walls of a tundish, and the absorption of inclusions by stopper or nozzle were also discussed.

关键词： fractal theory diffusion limited aggregation (DLA) model monomer agglomeration agglomerative ratio nonmetallic inclusions

高合金钢、炉渣、夹杂物、耐火材料之间的平衡

在线全文

学校读者我要写书评

暂无评论

高合金钢、炉渣、夹杂物、耐火材料之间的平衡

应用DLA模型对钢中夹杂物凝聚过程的三维模拟

2001中国钢铁年会

作者： mitsutaka hino Tetsuya NAGSAKA 张彩军 Department of Metallurgy Graduate School of Engineering Tohoku University 02 Aoba-yama Sendai Miyagi 980-8579Japan

一般来讲,单独使用一种脱氧剂时脱氧产物认为是纯氧化物。在19届炼钢会议上,日本科学促进协会推荐了每一个脱氧平衡热力学数据。然而,本课题组最新的研究表明,在弱脱氧过程中并不总是形成纯氧化物,并把一些示例列于本论文中。

关键词：钢液非金属夹杂物耐火材料铁-锰合金锰-氧平衡铁-铬合金铬-氧平衡脱氧

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

过程工程学报 2009年第S1期9卷 312-316页

作者：李宏郭洛方潘永红佐佐木康日野光兀北京科技大学冶金与生态工程学院北京100083 浦项工科大学日本东北大学大学院工学研究科

应用分形理论的DLA模型,在三维条件下模拟了钢水中夹杂物的自然凝聚行为.结果表明,三维条件下的凝聚过程同样具有不确定性;凝聚体平行于X-Y平面分层切割,各个断面上形状都有很大的区别,电子显微镜下观察到的夹杂物应该与模拟结果类似;... 详细信息

应用分形理论的DLA模型,在三维条件下模拟了钢水中夹杂物的自然凝聚行为.结果表明,三维条件下的凝聚过程同样具有不确定性;凝聚体平行于X-Y平面分层切割,各个断面上形状都有很大的区别,电子显微镜下观察到的夹杂物应该与模拟结果类似;单体凝聚模式下,随粒子间距离增加,两粒子的平均凝聚比率都按照乘幂曲线下降;集团凝聚模式下,凝聚体数量随凝聚时间的分布类似于随机理论中F分布曲线,单体粒子的数量在凝聚过程中逐渐减少;无外力条件下出钢脱氧后夹杂物粒子的平均凝聚速度要比TD和LF后期大20倍左右,中间包里小夹杂物自然凝聚成为大夹杂物的可能性不大;由集团凝聚过程可凝聚条件的探讨可知,夹杂物粒子能否凝聚取决于粒子浓度和扩散系数的组合关系,粒子凝聚曲线呈指数形式.

关键词：分形理论 DLA模型三维模拟钢中夹杂物

在线全文

学校读者我要写书评

暂无评论

应用DLA模型模拟钢中夹杂物集团凝聚

北京科技大学学报 2006年第4期28卷 343-347页

作者：李宏温娟张炯明王新华佐佐木康日野光兀北京科技大学冶金与生态工程学院北京100083 首钢技术研究院北京100041 日本东北大学大学院工学研究科

为探索钢水中大量粒子的凝聚过程,应用分形理论的DLA模型,对粒子集团凝聚行为进行了模拟研究.结果表明,模拟得到的凝聚体与钢中簇状类型夹杂物的形状相似.根据分形理论可以认为它们的凝聚过程遵守同一规则.大量粒子凝聚时先是各自凝聚... 详细信息

为探索钢水中大量粒子的凝聚过程,应用分形理论的DLA模型,对粒子集团凝聚行为进行了模拟研究.结果表明,模拟得到的凝聚体与钢中簇状类型夹杂物的形状相似.根据分形理论可以认为它们的凝聚过程遵守同一规则.大量粒子凝聚时先是各自凝聚成小集团,然后再合并成大集团.形成相等尺寸的粒子集团所需时间不同,初始条件相同形成的粒子集团形状不同.粒子凝聚速度随其移动步长和粒子浓度增大而加快,夹杂物粒子平均移动步长主要受钢水粘度和粒子尺寸影响.粒子集团大小分布随凝聚时间和粒子平均移动步长而变化.

关键词：分形理论 DLA模型钢夹杂物凝聚过程数值模拟

Comparative study of MPS method and level-set method for sloshing flows

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2014年第4期26卷 577-585页

作者：张雨新万德成 hino Takanori State Key laboratory of Ocean Engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Graduate school of Engineering Yokohama National University

This paper presents a comparative study of a meshless level-set method in the simulation of sloshing flows. The numerical moving particle semi-implicit （MPS） method and a grid based schemes of the MPS and level-set methods are outlined and two violent sloshing cases are considered. The computed results are compared with the corresponding experimental data for validation. The impact pressure and the deformations of free surface induced by sloshing are comparatively analyzed, and are in good agreement with experimental ones. Results show that both the MPS and level-set methods are good tools for simulation of violent sloshing flows. However, the second pressure peaks as well as breaking and splashing of free surface by the MPS method are captured better than by the level-set method.

关键词： moving particle semi-implicit (MPS) method level-set method liquid sloshing impact pressure free surface

Automated stopping criterion for spectral measurements with active learning

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 1252-1260页

作者： Tetsuro Ueno Hideaki Ishibashi Hideitsu hino Kanta Ono Synchrotron Radiation Research Center Kansai Photon Science InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and TechnologySayoHyogoJapan Department of Human Intelligence Systems Graduate School of Life Science and Systems EngineeringKyushu Institute of TechnologyKitakyushuFukuokaJapan The Institute of Statistical Mathematics Research Organization of Information and SystemsTachikawaTokyoJapan Department of Applied Physics Graduate School of EngineeringOsaka UniversitySuitaOsakaJapan Center for Integrative Quantum Beam Science Institute of Materials Structure ScienceHigh Energy Accelerator Research OrganizationTsukubaIbarakiJapan

The automated stopping of a spectral measurement with active learning is *** optimal stopping of the measurement is realised with a stopping criterion based on the upper bound of the posterior average of the generalisation error of the Gaussian process *** is revealed that the automated stopping criterion of the spectral measurement gives an approximated X-ray absorption spectrum with sufficient accuracy and reduced data *** proposed method is not only a proof-of-concept of the optimal stopping problem in active learning but also the key to enhancing the efficiency of spectral measurements for highthroughput experiments in the era of materials informatics.

关键词： criterion spectral optimal

Autothermal reforming of biogas over a monolithic catalyst

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

Journal of Natural Gas Chemistry 2010年第5期19卷 477-481页

作者： Sadao Araki Naoe hino Takuma Mori Susumu Hikazudani Hitachi Zosen Corporation Business & Product Development HeadquartersTechnical Research Institute

This study focused on measurement of the autothermal reforming of biogas over a Ni based monolithic catalyst. The effects of the steam/CH4 （S/C） ratio, O2/CH4 （O2/C） ratio and temperature were investigated. The CH4 conversions were higher under all examined temperatures than the equilibrium conversion calculated using the blank outlet temperature, because the catalyst layer was heated by the exothermic catalytic partial oxidation reaction. The CH 4conversion increased with increasing O2/C ratio. Moreover, the CH4 conversion was higher than the equilibrium conversion calculated using the blank outlet temperature for O2/C〉0.42 and reached about 100% at O2/C=0.55. However, the hydrogen concentration decreased for O2/C〉0.45 because hydrogen was combusted to steam in the presence of excess oxygen. On the other hand, the hydrogen and CO2 concentrations increased and the CO concentration decreased with increasing SIC ratio. As a result, it was found that the highest hydrogen concentrations and CH4 conversions were attained at the O2/C ratios of 0.45-0.55 and the SIC ratios of 1.5-2.5. Moreover, the H2/CO ratio could also be controlled in the range from about 2 to 3.5 to give at least 90% CH4 conversion, by regulating the O2/C or S/C ratios.

关键词： autothermal reforming biogas hydrogen production monolithic catalyst Ni based catalyst

Methods for evaluating overconsolidation ratio from piezocone sounding results

在线全文

学校读者我要写书评

暂无评论

Underground Space 2017年第3期2卷 182-194页

作者： Nachanok Chanmee Jinchun Chai Takenori hino Jun Wang Department of Civil Engineering and Architecture Saga UniversitySaga 840-8502Japan Institute of Lowland and Marine Research(ILMR) Saga UniversitySaga 840-8502Japan College of Civil Engineering and Architecture Wenzhou UniversityWenzhou University TownZhejiangChina

Methods for estimating the overconsolidation ratio(OCR)of soil deposits from piezocone sounding results have been *** existing methods have been briefly reviewed and a new method has been *** proposed method can be applied to both normally consolidated/overconsolidated and underconsolidated ***,existing methods have been modified so that they can be applied to underconsolidated ***,all the methods have been applied to 12 case histories collected from 6 different *** estimated values of OCR have been compared with the measured *** has been shown that if the parameters(soil properties and empirical parameters)can be determined appropriately,then all the methods can achieve a reasonable *** has also been shown that the proposed method exhibits a relatively better performance and results in less scattered data than the other methods.

关键词： Piezocone sounding Overconsolidation ratio Undrained shear strength Prediction Site investigation

Effect of pore water chemistry on anisotropic behavior of clayey soil and possible application in underground construction

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

Underground Space 2016年第2期1卷 114-123页

作者： Jinchun Chai Takehito Negami Kosuke Aiga Takenori hino Graduate School of Science and Engineering Saga University1 HonjyoSaga 840-8502Japan Institute of Lowland and Marine Research Saga University1 HonjyoSaga 840-8502Japan

The effect of pore water chemistry on anisotropic behavior of consolidation and shear strength of reconstituted Ariake clay has been investigated *** types of chemicals added into the pore water of the soil for enhancing flocculation microstructure of soil particles are sodium chloride(salt)(NaCl),and calcium chloride(CaCl_(2));and two dispersants added are sodium triphosphate(Na_(5)-P_(3)O_(10))and sodium hexametaphosphate(Na_(6)P_(6)O_(18)),*** concentrations of these chemicals in pore water were 2-3%.Degrees of anisotropy of the coefficient of consolidation and undrained shear strength decreased with adding NaCl and CaCl_(2),but increased with adding the *** of anisotropy also increased with one-dimensional(1D)deformation and the samples with dispersive additives had higher increase *** has been confirmed qualitatively by scanning electron microscopy(SEM)images that adding dispersive chemicals promoted the formation of dispersive microstructure and increased the degree of anisotropy,and the chemicals enhancing flocculent microstructure had an inverse *** possible application of the findings to underground construction has been discussed also.

关键词： Anisotropy Pore water chemistry Clay Consolidation Shear strength SEM image Underground construction