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Partial Oxidation of Methane Over the Perovskite Oxides

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Chinese Chemical Letters 2001年第11期12卷 975-978页

作者： chu, WL Tong, jh Yang, WS Lin, LW Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Ti0.2O3-delta oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.

关键词： methane oxidation Ba0.5Sr0.5Co0.8Fe0.2O3-delta Ba0.5Sr0.5Co0.8Ti0.2O3-delta perovskite

HIGH ACCURACY FOR MIXES FINITE ELEMENT METHODS IN RAVIART-THOMAS ELEMENT

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Journal of Computational Mathematics 1996年第2期14卷 175-182页

作者： Lin, Q Pan, jh CHINESE ACAD SCI INST SYST SCIBEIJINGPEOPLES R CHINA UNIV PETR DEPT BASIC SCIBEIJINGPEOPLES R CHINA

This paper deals with Raviart-Thomas element (Q(2,1) x Q(1,2) - Q(1) element). Apart from its global superconvergence property of fourth order, we prove that a postprocessed extrapolation can globally increased the ac... 详细信息

关键词： Math Wang HIGH ACCURACY FOR MIXES FINITE ELEMENT METHODS IN RAVIART-THOMAS ELEMENT

A Linear Programming Model for Seabed Oil-Gas Pipe Network

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China Ocean Engineering 1998年第4期13卷 477-482页

作者： Li, HW Tan, jh Shanghai Jiao Tong Univ Sch Naval Architecture & Ocean Engn Shanghai 200030 Peoples R China

This paper analyzes the pipe network system of oil-gas collection and transportation for offshore oilfield development. A '0-1' integer linear programming model is constructed to optimize the investment of seabed pipe network. The mathematical model is solved by the spanning tree method of graph theory and network analysis. All spanning trees of a network graph compose all the feasible solutions of the mathematical model. The optimal solution of the model is the spanning tree with the minimum cost among all spanning trees. This method can be used to optimize the seabed pipe network system and give a minimum cost plan for the development of offshore marginal oilfield groups.

关键词： seabed pipe network offshore oilfield linear programming network analysis

Process metallurgy and data-driven prediction and feedback of blast furnace heat indicators

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1228-1240页

作者： Quan Shi Jue Tang Mansheng chu School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-carbon Steelmaking Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education) Shenyang 110819China

The prediction and control of furnace heat indicators are of great importance for improving the heat levels and conditions of the complex and difficult-to-operate hour-class delay blast furnace(BF)*** this work,a prediction and feedback model of furnace heat indicators based on the fusion of data-driven and BF ironmaking processes was *** data on raw and fuel materials,process op-eration,smelting state,and slag and iron discharge during the whole BF process comprised 171 variables with 9223 groups of data and were comprehensively analyzed.A novel method for the delay analysis of furnace heat indicators was *** extracted delay variables were found to play an important role in *** method that combined the genetic algorithm and stacking efficiently im-proved performance compared with the traditional machine learning algorithm in improving the hit ratio of the furnace heat prediction *** hit ratio for predicting the temperature of hot metal in the error range of±10℃ was 92.4%,and that for the chemical heat of hot metal in the error range of±0.1wt%was 93.3%.On the basis of the furnace heat prediction model and expert experience,a feedback model of furnace heat operation was established to obtain quantitative operation suggestions for stabilizing BF heat *** sugges-tions were highly accepted by BF ***,the comprehensive and dynamic model proposed in this work was successfully ap-plied in a practical BF *** improved the BF temperature level remarkably,increasing the furnace temperature stability rate from 54.9%to 84.9%.This improvement achieved considerable economic benefits.

关键词： blast furnace furnace heat genetic algorithm stacking prediction and feedback

The silt stalactite——a peculiar kind of sedimentary structures

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Chinese Science Bulletin 1997年第23期42卷 1974-1977,2025页

作者： Zhong, jh Ma, ZP Univ Petr China Dongying 257062 Peoples R China

THE Yellow River, with its huge amount of silt charge from the Loess Plateau, is the secondlargest river in China. Its lower reach has become a famous hanging river because of serioussilting up, and the magnitude of discharge changes much from season to season. As a result ofsilting, migration of the stream channel happens frequently. Lateral erosion of channel or pointbars, and scarp slopes forming during the erosion may be often observed. The silt stalactite,hitherto not reported, usually forms on surfaces of the slope. As a newly found kind of sedirnen-tary structure, the silt stalactite may have some significance to the study of sedimentary envi-ronments and paleoclimate.

关键词： silt stalactite sedimentary structure the Yellow River Delta.

EFFECT　OF　TRANSITION　METAL　Ni　ON　WELDING　PROPERTIES　OF　TITANIUM　ALLOY　STAINLESS　STEEL

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中国有色金属学会会刊：英文版 1997年第1期7卷 71-75页

作者： Sun, RL Meng, XC Zhang, jh HARBIN INST TECHNOL SCH MAT SCI & ENGNHARBIN 150001PEOPLES R CHINA

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔ... 详细信息

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔｍｅｎｔ，ＪｉａｍｕｓｉＩｎｓｔｉ...

关键词： Ti alloy stainless steel transition metal Ni diffusion welding

Conditions for origin to be a center and the bifurcation of limit cycles in a class of cubic systems

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Chinese Science Bulletin 1997年第14期42卷 1157-1161页

作者： Zhu, jh Zhu, SM Department of Mathematics Zhongshan University Guangzhou China

FOR a class of differential systems of center and focus

关键词： center fine focus focal value limit cycle symbolic computation.

Investigation of the Surface State of Zeolite HZSM-5 Pretreated with Toluene by Using Fast Atom Bombardment Mass Spectrometry (FABMS)

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Chinese Chemical Letters 1998年第7期9卷 671-674页

作者： Zhu, jh Xu, QH Nanjing Univ Dept Chem Nanjing 210093 Peoples R China

Toluene pretreatment caused many activated toluene species existing on the surface of zeolite HZSM-5, by which the activity of sample was increased. Moreover, variation in the surface Si+/Al+ ratio of HZSM-5 was sensi... 详细信息

关键词： zeolite HZSM-5 surface state FABMS toluene ethylation

SYNTHESIS AND CHARACTERIZATION OF HETEROBIMETALLIC COMPLEXES:(Cp_2LnOCH_2C_6H_5)Cr(CO)_3(Ln=Gd,Dy,Yb,Y)

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Chinese Chemical Letters 1995年第3期6卷 261-262页

作者： Qian, CT Guo, jh Acad Sinica Shanghai Inst Organ Chem Organomet Chem Lab Shanghai 200032 Peoples R China

Heterobimetallic complexes in which chromium and lanthanide metals were bridged with difunctional benzyloxide group (Cp2LnOCH2C6H5)Cr(CO)3 (Ln=Gd. Dy. Yb. Y). were synthesized The complexes were characterized by eleme... 详细信息

关键词： Dy AND SYNTHESIS CHARACTERIZATION HETEROBIMETALLIC OF Gd COMPLEXES Yb Cr