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Carbon Diffusion in Hot Strips of Low Carbon Steel Produced by CSP Line under Different Thermal Histories

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Journal of Materials Science & Technology 2005年第1期21卷 21-24页

作者： HaoYU haoren YonglinKANG KeluWANG SchoolofMaterialsScienceandEngineering UniversityofScienceandTechnologyBeijingBeijing100083China LaiwuSteelGroupLTD. Laiwu271104China JinanIron&SteelGroupCo. Jinan250101China

Two experiments were carried out on the same compact strip production (CSP) line, which differs in that one of them experienced γ→α→γ thermal history. The differences in microstructure, precipitation, misorientation etc between two experiments were investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back-scattered diffraction (EBSD) and positron annihilation technique (PAT). The carbon concentration in matrix is more inhomogeneous in the experiment than that with γ→α→γ7 thermal history. The specific precipitation characteristic in the experiment without γ→α→γ thermal history is discussed on the basis of different carbon diffusion behavior and interaction between dislocation and excess carbon.

关键词： Compact strip production Microstructure Precipitation Carbon diffusion Dislocation

Effects of diphosphonic acid on ilmenorutile collecting property and research of action mechanism

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Journal of University of Science and Technology Beijing 2002年第4期9卷 249-252页

作者： haoren FeifeiJi ShuxiangZhang MengBao QufeiZhang CollegeofChemicalEngineering JinanUniversityJinan250022 DepartmentofResource&EnvironmentEngineering ZiboCollege255049

The effects of several collectors and their dosage on pure ilmenorutile atdifferent pH values were studied and the collecting strength of several representative collectorswas investigated. The experimental results indicate that diphosphonic acid is a good collector forilmenorutile and the recovery of ilmenorutile ranges from 90.87 percent to 91.70 percent when thepulp pH value is 2.0-4.0 and the dosage is 75 mg/L. The sequence of collecting ability for severalcollectors is as follows: diphosphonic acid> TF279 > cyclic allryl hydroximic acid > benzyl arsenicacid> salicylic hydroximic acid> alkyl hydroximic acid. Meanwhile, IAS (infrared absorptionspectrum) and XPS (X-ray photoelectron spectroscopy) were used to detect and analyze the actionmechanism of diphosphonic acid on ilmenorutile. IAS results showed that the characteristicabsorption peak relating to P=O as well as P-O vibration occurred between wave numeber 1140 and 1032cm^(-1), and diphosphonic acid had adsorbed on the surface of ilmenorutile. XPS results indicatedthat the binding energy of P2P peak of ilmenorutile had changed 0.45 eV after treated bydiphosphonic acid. This proves that the adsorption is mainly chemical adsorption.

关键词： collector diphosphonic acid ilmenorutile action mechanism

Hepatitis G virus genomic RNA is pathogenic to Macaca mulatta

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World Journal of Gastroenterology 2005年第7期11卷 970-975页

作者： haoren Fen-LuZhu Ming-MeiCao Xin-YuWen PingZhao Zhong-TianQi DepartmentofMicrobiology SecondMilitaryMedicalUniversityShanghai200433China DepartmentofEtiology BeijingMilitaryMedicalCollegeBeijing100071China

AIM: To explore the pathogenicity and infectivity of hepatitis G virus (HGV) by observing replication and expression of the virus, as well as the serological and histological changes of Macaca mulatta infected with HGV genomic RNA or HGV RNA-positive ***: Full-length HGV cDNA clone (HGVqz) was constructed and proved to be infectious, from which HGV genomic RNA was transcribed in vitro. Macaca mulatta BY1 was intra-hepatically inoculated with HGV genomic RNA, HGV RNA-positive serum from BY1 was intravenously inoculated into Macaca mulatta BM1, and then BB1 was infected with serum from BM1. Serum and liver tissue were taken regularly, and checked with RT-PCR, in situ hybridization and other immunological, serological,histological ***: Serum HGV RNA was detectable in all the 3Macaca mulattas, serological and histological examinations showed the experimental animals had slightly elevated alanine transaminase (ALT) and developed HGV viremia during the infectious period. The histology, immunohistochemistry, and in situ hybridization in liver tissues of the inoculated animals demonstrated a very mild hepatitis with HGV antigen expression in cytoplasm of ***-PCR and quantitative PCR results showed that HGV could replicate in ***: The genomic RNA from full-length HGV cDNA is infectious to the Macaca mulatta and can cause mild hepatitis. HGV RNA-positive serum, from HGV RNA inoculated Macaca mulatta, is infectious to other Macaca mulattas. Macaca mulatta is susceptible to the inoculated HGV, and therefore can be used as an experimental animal model for the studies of HGV infection and pathogenesis.

关键词： Hepatitis G virus Genome RNA Macaca mulatta Pathogenicity

Influence of Initial Water Content on Synthesis of Silicalite-1 Zeolite

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China Petroleum Processing & Petrochemical Technology 2017年第4期19卷 11-19页

作者： Zhang Honghan Zhang Shanhe Wang haoren Li Chunyi State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580

The effect of initial water content on the synthesis of silicalite-1 zeolite and its reaction performance in methanol to propylene(MTP) reaction was comprehensively investigated. The as-synthesized samples were characterized by XRD,N_2 adsorption and desorption, SEM, and FTIR techniques, and studied for the methanol to propylene(MTP) reaction. The results showed that the initial water content played a crucial role on the particle size and porous structure of the silicalite-1 zeolites. It was found that adding initial water to reach a certain amount, the crystal size reduced obviously and the mesoporous structure appeared. Upon applying the silicalite-1 zeolite samples in the MTP reaction, they showed excellent catalytic performance to reach a highest propene mass yield of 26.81%(on the CH_2 basis) and a P/E ratio of 6.28 in 2 h. The excellent catalytic performance of silicalite-1 can be attributed to its mesoporous structure.

关键词： initial water content hierarchical pore silicalite-1 MTP

Influence of Polycarboxylate Superplasticizer on Rheological Behavior in Cement Paste

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Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 932-937页

作者：何燕 ZHANG Xiong KONG Yaning WANG Xiaofu SHUI Liangliang WANG haoren School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Key Laboratory of Advanced Civil Engineering Materials of Education Ministry School of Material Science and TechnologyTongji UniversityShanghai 201804China Shanghai Municipal Engineering Design Institute(Group)Co. Ltd.Shanghai 200092China

Molecular structures of polycarboxylate（PCE） superplasticizer significantly affect the rheological properties of cement paste. Consequently, we employed self-synthesized PCE copolymers with different carboxylic densities to investigate their influence on the rheological behavior of cement paste. Three typical rheological models were applied to analyze the rheological properties, including Power-law model, Bingham model as well as Herschel-Buikley model. In addition, the thixotropical performances of cement paste in the presence of PCE with different carboxylic densities were investigated. The results show that the carboxylic density of PCE greatly influences the dispersing performance of PCE superplasticizers. As carboxylic density increases, the dispersing capability of PCE improves, and P（PEG1-AA6） possesses the strongest dispersing capability, the initial fluidity and 1 h fluidity of cement paste are both the highest, and cement paste has the lowest viscosity and the smallest hysteresis loop.

关键词： polycarboxylate superplasticizer carboxylic density fluidity rheology thixotropy

Effect of PCEs with Different Functional Groups on the Performance of Cement Paste

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Journal of Wuhan University of Technology(Materials Science) 2019年第5期34卷 1163-1169页

作者： HE Yan[[ ZHANG Xiong WANG Yiting KONG Yaning JI Tao SHUI Liangliang WANG Xiaofu WANG haoren School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China Key Laboratory of Advanced Civil Engineering Materials of Education Ministry Tongji UniversityShanghai 201804China School of Architecture and Engineering Nanjing Institute of TechnologyNanjing 211167China Shanghai Municipal Engineering Design Institute(Group)Co. Ltd.Shanghai 200092China

The adsorption behaviors and dispersing properties of polycarboxylate superplasticizer(PCE) with different functional groups were systematically analyzed to reveal the theory and methods of modifying PCE molecular structures and regulating PCE performances. By substituting carboxylic groups with sulfonic groups, ester groups or acylamino groups, respectively, modified PCEs with different functional groups were synthesized. Results show that introducing low amount of ester groups or sulfonic groups into the PCE molecules has no negative effects on the fluidity of cement paste, while introducing acylamino groups into PCE molecules significantly weakens the fluidity of cement paste. At low amount(when the molar ratio of sodium methallyl sulfonate to TPEG is lower than 0.4), the rapid adsorption of sulfonic groups onto the cement particles contributes to the high dispersing performance of the sulfonic group modified PCEs. When the substitution ratio of acrylic acid by sulfonic acid is higher than 0.4, the viscosity and the yield stress of cement paste increases sharply. Redundant sulfonic groups lead to the excessive charge density of the PCE, which contributes to the inhomogeneous adsorption on the cement grains and hence results in the decline of the dispersing performance. Substitution of carboxylic group by acylamino group or ester group slightly changes the viscosity as well as the yield stress of cement paste. Introducing sulfonic group into PCE molecule improves the adsorption behavior of PCEs, while introducing ester group or acylamino group into PCE depresses the adsorption properties.

关键词： polycarboxylate superplasticizer functional group adsorption behavior rheological properties cement hydration

The role of single-boron of N-doped graphene for effective nitrogen reduction

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Journal of Materials Science & Technology 2023年第28期159卷 244-250页

作者： Chuangwei Liu haoren Zheng Tianyi Wang Zhongyuan Guo Fangyuan Zhu Hongbo Xie Gaowu Qin Hao Li Song Li Key Lab for Anisotropy and Texture of Materials School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Room-temperature electrocatalytic nitrogen reduction reaction(NRR)is of paramount significance for the fertilizer industry and fundamental catalysis ***,many NRR catalysts were based on the use of ***,we focus on exploring boron-based,metal-free,efficient catalysts for NRR by den-sity functional theory calculations with van der Waals corrections(DFT+D3).Our results show that the NRR performance of the boron active site can be improved by tuning the N-coordination environment in a graphene sheet,and the B-N-C structures show excellent *** considering the correlation be-tween the Bader charges of the boron dopant over N-decorated graphene and their NRR activities,the ra-tional design principle of a boron-based catalyst for NRR is *** boron-site with one pyridinic nitrogen in a double-vacancy structure is found to be a highly active center,with low reaction energy(0.53 eV)and kinetic barrier(0.84 eV)through the distal *** also found that the charge loss of boron considerably hampers hydrogen adsorption,which in turn promotes the NRR efficiency by hin-dering the competing hydrogen *** work offers new insights into developing low-cost,highly effective boron-based materials as promising electrocatalysts for green ammonia synthesis.

关键词： B-based metal-free materials Nitrogen reduction reaction Ammonia synthesis Density functional theory Catalyst design

Spring migration duration exceeds that of autumn migration in Far East Asian Greater White-fronted Geese (Anser albifrons)

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Avian Research 2019年第3期10卷 319-329页

作者： Xueqin Deng Qingshan Zhao Lei Fang Zhenggang Xu Xin Wang haoren He Lei Cao Anthony David Fox State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China School of Life Science University of Science and Technology of ChinaHefei 230026AnhuiPeople’s Republic of China Key Laboratory of Forestry Remote Sensing Based Big Data and Ecological Security for Hunan Province Central South University of Forestry and TechnologyChangsha 410004China Information Management and System Department IBSSXi’an Jiaotong-Liverpool UniversitySuzhou 215123China Department of Bioscience Aarhus UniversityKalo Grenavej 148410 RondeDenmark

Background:Migration theory suggests,and some empirical studies show, that in order to compete for the best breeding sites and increase reproductive success,long-distance avian migrants tend to adopt a time minimization strategy during spring migration, resulting in shorter duration spring migration compared to that in ***:Using GPS/GSM transmitters,we tracked the full migrations of 11 Greater White-fronted Geese (Anser albifrons) between southeast China and the Russian Arctic,to reveal the migration timing and routes of the East Asian population, and compare the difference in duration between spring and autumn migration of this ***:We found that migration in spring (79 ± 12 days) took more than twice as long to cover the same distance as in autumn (35 ±7 days).This difference in migration duration was mainly determined by significantly more time spent in spring (59±16 days) than in autumn (23± 6days) at significantly more stopover sites. Conclusions:We suggest that these geese, thought to be partial capital breeders, spent almost three quarters of total migration time at spring stopover sites to acquire energy stores for ultimate investment in reproduction, although we cannot reject the hypothesis that timing of the spring thaw also contributed to stopover *** autumn,they acquired necessary energy stores on the breeding grounds sufficient to reach Northeast China staging areas almost without stop, which reduced stopover times in autumn and resulted in the faster autumn migration than spring.

关键词： Greater White-fronted Goose GPS/GSM tracking Migration Spring staging Stopover duration

Status of an MWth integrated gasification fuel cell powergeneration system in China

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International Journal of Coal Science & Technology 2021年第3期8卷 401-411页

作者： Chang Wei Zhien Liu Chufu Li Surinder Singh haoren Lu Yudong Gong Pingping Li Hanlin Wang Xia Yang Ming Xu Shujun Mu National Institute of Clean-and-Low-Carbon Energy BeijingChina NICE America Research Mountain ViewUSA Nexant San FranciscoUSA

Abstract Here,we provide a status update of an integrated gasification fuel cell(IGFC)power-generation system being developed at the National Institute of Clean-and-Low-Carbon in China at the megawatt thermal(MWth)*** system is designed to use coal as fuel to produce syngas as a first step,similar to that employed for the integrated gasification combined ***,the solid-oxide fuel-cell(SOFC)system is used to convert chemical energy to electricity directly through an electrochemical reaction without *** system leads to higher efficiency as compared with that from a traditional coal-fired power *** unreacted fuel in the SOFC system is transported to an oxygencombustor to be converted to steam and carbon dioxide(CO_(2)).Through a heat-recovery system,the steam is condensed and removed,and CO_(2) is enriched and captured for sequestration or *** economic analyses for a typical IGFC system was performed and the results were compared with those for a supercritical pulverized coal-fired power *** SOFC stacks selected for IGFC development were tested and qualified under hydrogen and simulated coal syngas *** results using SOFC stacks and thermodynamic analyses indicated that the control of hydrogen/CO ratio of syngas and steam/CO ratio is important to avoid carbon deposition with the fuel pipe.A 20-kW SOFC unit is under development with design power output of 20 kW and DC efficiency of 50.41%.A 100 kW-level subsystem will consist of 6920-kW power-generation units,and the MWth IGFC system will consist of 59100 kWlevel subsystems.

关键词： Integrated gasification fuel cell(IGFC) Solid oxide fuel cell Stack module Carbon dioxide capture Oxygen-combustor