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Numerical model of inclusion separation from liquid metal with consideration of dissolution in slag

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Journal of Iron and Steel Research International 2019年第11期26卷 1147-1153页

作者： Wei Liu Shu-feng yang Jing-she Li Feng Wang hong-bo yang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing 100088China

The transport of inclusion particles through the liquid metal/molten slag interface and their dissolution in the slag are two key processes of inclusion *** on the latest version of inclusion transport model that takes into account full Reynolds number range and a dissolution kinetics model,a coupled model was developed to simulate the whole process of inclusion removal,from floating in the liquid steel to crossing the interface and further to entering and dissolving in the molten *** interaction between the inclusion motion and dissolution was *** though the inclusion velocity is a key parameter for dissolution,the simulation results show no obvious dissolution during moving state because the process is too short and most of the inclusions dissolve during its static stay in the slag side above the *** rate-controlling step of inclusion removal is the transport through the steel-slag interface for the small-size inclusion and static dissolution above the interface for the large-size inclusion,respectively.

关键词： Inclusion removal Slag dissolution-Inclusion separation Clean steel Secondary refining

A Mathematical Model to Characterize RH Desulfurization Process

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Journal of Iron and Steel Research International 2014年第11期21卷 995-1001页

作者： hong-bo yang Shu-feng yang Jing-she LI Jiang-shan ZHANG School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

A physical model based on similarity principles was built to simulate RH desulfurization process. In order to quantitatively analyze RH desulfurization process, a mathematical model was proposed. By analyzing experimental results with the mathematical model, an empirical formula whose determination coefficient was 0.98 was given to express the relationship between transient desulfurization efficiency and time. All the determination coefficients of four fitted curves based on four repeated experiments with different gas flow rates were more than 0.94, which was the exact evidence of the rationality of the empirical formula. Meanwhile, it was found that transient desulfurization ability increased firstly and then decreased with increasing gas flow rate and reached the maximum value when the gas flow rate was 1.8 m^3/h. A plenty of repeated trials showed the same rule, which validated the mathematical model and the conclusions obtained from physical experiments.

关键词： RH transient desulfurization mathematical model physical experiment trial test clesul{urization e{ficiency

Removal and occurrence state transformation of Ti impurity in Gd metal

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Rare Metals 2021年第8期40卷 2320-2326页

作者： Zhen-Fei yang Si-Ming Pang Shi-hong Yan hong-bo yang Xiao-Wei Zhang Qiong Zhu De-hong Chen Dao-Gao Wu General Research Institute for Nonferrous Metals Beijing100088China National Engineering Reseach Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.Beijing100088China

The interaction mechanism of B and Ti in liquid Gd metal was theoretically analyzed,and the occurrence state transformation and removal of Ti impurity were experimentally analyzed in this *** research results indicated that the B additive reacted with the Ti impurity in liquid Gd metal to form the high-melting-point TiB_(2)at 1673 *** to the low density of TiB_(2)that is far lower than that of Gd,TiB_(2)floated up to the liquid surface,and then,the Ti impurity could be effectively removed from Gd *** melting time and increasing B additive amount could increase Ti removal rate,but the increase in the rate slows beyond a certain duration and B *** recommended operating parameter,melting time of 60 min and B additive content of 0.1394 wt%could reduce Ti content from 0.1534 wt%to 0.0433 wt%,and the removal rate was 71.9%.

关键词： Gd metal Ti impurity B additive TiB_(2)

Temperature Characteristics and Error Compensation for Quartz Flexible Accelerometer

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International Journal of Automation and computing 2015年第5期12卷 540-550页

作者： Jing-Min Gao Ke-Bei Zhang Fu-Bin Chen hong-bo yang Electronic Information and Control Center Beijing Information Science & Technology University Beijing Institute of Control Engineering School of Automation Beijing Information Science & Technology University

Reduction of error due to the influence of temperature on the quartz flexible accelerometer without any heating device is a difficult task, and is also a tendency for research and application. In this paper, static and dynamic temperature compensation models are established in order to reduce the temperature influence on accelerometer measurement accuracy. Combined with the experiment data, the relationship between the accelerometer output accuracy, temperature and the magnitude of acceleration is analyzed. The data collected from the temperature experiment show that output value of the accelerometer varies with temperature. The method of uniaxial quadrature experiment is adopted and the accelerometer output value is gauged at temperature ranging from-20℃ to 50℃. Having used the static and the dynamic temperature compensation models, the accelerometer temperature error compensation experiment is conducted and the compensated errors by the two models are analyzed. The result shows that the compensated value meets the technical requirements. Two technical indicators, the zero bias K0 and the scaling factor K1, which are used to measure the degree of accelerometers, are both improved and their fluctuation ranges are reduced.

关键词： Acceleration error compensation temperature charac

Double glow plasma carburization on zirconium to improve surface hardness and wear resistance

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Rare Metals 2017年第7期36卷 569-573页

作者： Jian-Qing Wang hong-bo yang Bing Zhang Wei Xi Ze Dong Qin Jing State Key Laboratory o'f Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

Though some important progress in the excel- lent mechanical properties of zirconium alloys have been reported, their high surface hardness and good wear prop- erties need to be explored further. In this work, a carbur- ized layer was formed on the surface of commercially pure zirconium by a double glow plasma hydrogen-free car- burizing technique. Commercial high-purity graphite was used as the carbon source material. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dis- persive spectroscopy （EDS）, Vickers hardness test, friction and wear test were used to characterize the samples car- burized. The carburized layer could be clearly observed under a microscope. XRD patterns indicate that the zirco- nium carbide phase is formed in the carburized layer. The surface hardness of the sample increases significantly after carburization. Friction and wear tests results show that wear resistance and friction coefficient of zirconium are improved considerably after carburization. Surface plastic deformation is arrested to a low extent in contrast with pure zirconium because of the presence of ZrC phases during the wear test. The results may provide new insight into methods for surface strengthening of zirconium alloys.

关键词： Zirconium alloys Carburization Hardness Wear resistance

Corrosion property of copperized layer on Zr formed by double glow plasma surface alloying technique

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Rare Metals 2016年第9期35卷 711-717页

作者： Jian-Qing Wang hong-bo yang Bing Zhang Han-Long Lin Bao Chen Qin Jing State Key Laboratory of Metastable Materials Science and Technology Yanshan University

Zr and its alloys have excellent mechanical properties as new structural material,but in specific application environment,its corrosion resistance still needs to be further *** this work,double glow plasma surface alloying technique was used for copperizing on pure Zr ***,X-ray diffraction（XRD）,scanning electron microscope（SEM） and energy dispersion spectrum（EDS） were employed to characterize the ***,research was also conducted on the polarization curve of the samples in different *** on surface can improve corrosion resistance of pure Zr in 3.5 % Na Cl and 0.5 moláL-1Na OH *** in 0.5 moláL-1Na OH solution,the corrosion resistance can achieve significant ***,copperizing has no influence on the improvement of corrosion resistance of pure Zr in 0.5 moláL-1H2SO4 *** results may provide new insight into way for improving the corrosion property of zirconium alloys.

关键词： Zr Double glow plasma surface alloying technique Copperizing Polarization curve Corrosion resistance

Induction of Endothelial Cell Apoptosis by Anti-alpha-enolase Antibody

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Chinese Medical Sciences Journal 2011年第3期26卷 152-157页

作者： hong-bo yang Wen-jie Zheng Xuan Zhang Fu-lin Tang Department of Endocrinology Peking Union Medical College HospitalChinese Academy of Medical Sciences ＆ Peking Union Medical CollegeBeijing 100730China Department of Rheumatology Peking Union Medical College HospitalChinese Academy of Medical Sciences ＆ Peking Union Medical CollegeBeijing 100730China

Objective To assess the prevalence of anti-alpha-enolase antibody in systemic autoimmune diseases in Chinese patients and its role in endothelial cell *** The reactivity of anti-alpha-enolase antibody in a variety of autoimmune disorders in Chinese patients was evaluated by dot blot *** cell apoptosis was investigated by in vitro incubation of endothelial cells with IgG purified from anti-alpha-enolase antibody-positive sera,with or without pre-incubation with recombinant *** Anti-alpha-enolase antibody was prevalent in different systemic autoimmune diseases with relatively high reactivity in Chinese *** vitro incubation of endothelial cells with IgG containing anti-alpha-enolase antibody induced apoptosis in a time-and dose-dependent *** was partly inhibited by pre-incubation of the endothelial cells with recombinant *** Our data suggest that alpha-enolase is a common auto-antigen recognized by anti-endothelial cell antibodies in connective tissue *** between alpha-enolase and its autoantibody plays a role in endothelial cell *** other than cell killing may contribute to the pathogenesis of endothelial damage and microvascular lesions.

关键词： anti-alpha-enolase antibody apoptosis endothelial cell

Management of Adult Growth Hormone Deficiency at Peking Union Medical College Hospital:A Survey among Physicians

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Chinese Medical Sciences Journal 2016年第3期31卷 168-172页

作者： hong-bo yang Meng-qi Zhang Hui Pan Hui-juan Zhu Department of Endocrinology Peking Union Medical College HospitalChinese Academy of Medical Sciences & Peking Union Medical College Department of Pediatrics Peking Union Medical College HospitalChinese Academy of Medical Sciences & Peking Union Medical College

Objective To evaluate physicians' attitude and knowledge about the management of adult growth hormone deficiency(AGHD) at Peking Union Medical College Hospital and impact factors associated with better *** A 21-question anonymous survey was distributed and collected at Peking Union Medical College Hospital,a major teaching hospital in Chinese Academy of Medical *** of physicians' educational background,clinical training,patient workload per year and continuing medical education in AGHD were *** associated with appropriate answers were further analyzed by multivariate regression *** One hundred and eighteen internal medicine residents,endocrine fellows,attending physicians and visiting physicians responded to the *** them,44.9% thought that AGHD patients should accept recombinant human growth hormone replacement ***,56.8% selected insulin tolerance test and growth hormone-releasing hormone-arginine test for the diagnosis of *** regression analysis of physician demographic data,educational background,and work experience found no consistent independent factors associated with better decision-making,other than continued medical education,that were associated with treatment *** The physicians' reported management of AGHD in this major academic healthcare center in Beijing was inconsistent with current *** quality continued medical education is required to improve Chinese physician management of AGHD.

关键词： adult growth hormone deficiency management continued medical education

A new convenient asymmetric approach to herbarumin Ⅲ

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Chinese Chemical Letters 2007年第3期18卷 255-257页

作者： Xue Song Chen Shi Jun Da Li hong yang bo Yan Xu Ztfi Xiang Xie Ying Li The State Key Laboratory of Applied Organic Chemistry Institute of Organic Chemistry Lanzhou University Lanzhou 730000 China

The asymmetric total synthesis of herbarumin Ⅲ 3, a naturally occurred phytotoxin, along with 8-epi-herbantmin Ⅲ 22, was succeeded in 12 steps from n-butyraldehyde based on Brown＇s asymmetric allylation, taking mod... 详细信息

关键词： Herbarumin Ⅲ Asymmetric allylation Modified Julia olefination Yamaguchi's macro-lactonization