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Corrosion resistance of Mg（OH）2/Mg-Al-layered double hydroxide coatings on magnesium alloy AZ31:influence of hydrolysis degree of silane

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Rare Metals 2019年第7期38卷 629-641页

作者： Qing-Song Yao Zhong-Chao Li Zai-Meng Qiu Fen Zhang Xiao-Bo Chen dong-Chu Chen Shao-Kang guan Rong-chang Zeng College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China School of Engineering RMIT University Carlton VIC 3053 Australia School of Materials Science and Energy Engineering Foshan University Foshan 528000. China School of Materials Science and Engineering Zhengzhou University Zhengzhou 450002 China

Mg(OH)2/Mg-Al-layered double hydroxide (LDH) coatings were modified with methyltrimethoxysilane (MTMS) on magnesium alloys. Effect of hydrolysis degree of silane solution on coating formation was investigated. Chemical compositions and surface morphologies of the coatings were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electronic microscopy (FESEM). Results indicated that the composite coatings consisted of polymethyltrimethoxysilane (PMTMS), LDH and Mg(OH)2. Electrochemical and hydrogen evolution measurements revealed that the composite coatings possessed good corrosion resistance, especially the ones prepared in a high hydrolysis degree of silane. The optimum corrosion resistance of the composite coati ng was LDH/PMTMS-3 coating, which had the lowest value of corrosion current density (5.537×10^-9 A·cm^-2) and a dense *** mechanism for coating formation and corrosion process of MTMS-modified Mg(OH)2/Mg-Al-LDH coatings were discussed.

关键词： Magnesium alloy Layered double hydroxide (LDH) Silane Coating Corrosion resistance

Inhibitory Effect of Anti-HER-2 Anti-CD3 Bi-specific Antibody on the Growth of Gastric Carcinoma

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Chemical Research in Chinese Universities 2006年第2期22卷 193-196页

作者： FANG Xue-dong REN Hui ZHANC Yan WANG guan-jun No. 2 Affiliated Hospital Jilin University Changchun 130041 P. R. China China-Japan Union Hospital Jilin University Changchun 130033 P. R. China No. 1 Affiliated Hospital Jilin University Changchun 130022 P. R. China

To evaluate the effect of anti-HER-2 × anti-CD3 bi-specific antibody（BsAb） on the growth of HER-2/neu-expressing human gastric carcinoma in vitro and in vivo, an MTT assay was carried out to test the inhibitive rates of herceptin, anti-CD3 and BsAb antibodies on SGC-7901 gastric carcinoma cells. Immunocytochemistry methods were used to test the HER-2 level of SGC-7901. Nude mice models were employed to test the effect of HER-2 CD3 BsAh combined with effector ceils（ peripheral blood lymphatic cells of healthy human beings） on the growth of tumors in animals. Compared with that of the untreated control group, the tumor cell growth rates in vitro and in vivo will both be significantly inhibited when treated with effector cells combined with anti-CD3 McAb, herceptin or HER2 CD3 BsAb （p 〈0. 05）, and the growth inhibition is the most remarkable in the group treated with HER2 CD3 BsAb combined with effector cells. The growth of tumor xenografts will also be significantly inhibited in the group treated with HER2 CD3 BsAb combined with effector cells when compared with that in the group treated with anti-CD3 McAb or the group treated with herceptin combined with effector cells（p 〈0. 05）. We can conclude that HER-2/neu is possibly a useful target for immunotherapy of gastric carcinoma, and anti-HER2 × anti-CD3 BsAb has evident anti-tumor efficacy both, in vitro and in vivo.

关键词： Anti-HER-2 × anti-CD3 bi-specific antibody HER-2/neu Human gastric carcinoma Nude mice

Streamline-Diffusion Method of a Lowest Order Nonconforming Rectangular Finite Element for Convection-Diffusion Problem

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 427-434页

作者： dong-yang SHI Hong-xin CUI Hong-bo guan School of Mathematics and Statistics Zhengzhou University Mathematical Science Henan College of Traditional Chinese Medicine

The streamline-diffusion method of the lowest order nonconforming rectangular finite element is proposed for convection-diffusion problem. By making full use of the element＇s special property, the same convergence order as the previous literature is obtained. In which, the jump terms on the boundary are added to bilinear form with simple user-chosen parameter δKwhich has nothing to do with perturbation parameter εappeared in the problem under considered, the subdivision mesh size hKand the inverse estimate coefficient μin finite element space.

关键词： convection-diffusion problem streamline-diffusion method error estimate nonconforming rectangular finite element

Computational investigation of contraction behavior in a liquid-solid fluidized bed

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Petroleum Science 2012年第1期9卷 93-99页

作者： Yao Xiuying guan Yanjun chang Jian Zhang Kai Jiang Jianchun State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power UniversityBeijing 102206China National Engineering Laboratory for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China

Contraction behavior of a liquid-solid fluidized bed has been investigated numerically. Based on a simple hydrodynamic model proposed by Brandani and Zhang （2006）, a case study for solid particles with a density of 3,000 kg/m^3 and a diameter of 2.5× 10^-3 m is simulated in a two-dimensional fluidized bed （0.50 m height and 0.10 m width）. Due to the continuity of numerical computation, there is a transition region between two zones of different solid holdups when the liquid velocity is suddenly changed. The top, middle and bottom interfaces are explored to obtain a reasonable interface height. The simulated results show that the steady time of the middle interface is more close to Gibilaro＇s theory and suitable for describing the contraction process of a phase interface. Furthermore, the effect of liquid velocity and particle diameter is simulated in the other two-dimensional fluidized bed （0.10 m height and 0.02 m width） where the solid particles are glass beads whose properties are similar to those of the catalyst particles used in the alkylation process. The results also show good agreement with Gibilaro＇s theory, and that larger particles lead to a more obvious bed contraction.

关键词： Liquid fluidized bed dynamic bed contraction CFD simulation

Removal of VOCs from gas streams with double perovskite-type catalysts

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Journal of Environmental Sciences 2018年第7期30卷 205-216页

作者： Kuan Lun Pan guan Ting Pan Siewhui Chong Moo Been chang Graduate Institute of Environmental Engineering National Central University Department of Chemical Engineering National Taipei University of Technology Department of Chemical and Environmental Engineering University of Nottingham Malaysia Campus

Double perovskite-type catalysts including La2 CoMnO6 and La2 CuMnO6 are first evaluated for the effectiveness in removing volatile organic compounds（VOCs）, and single perovskites（La CoO3, LaMnO3, and La Cu O3） are also tested for comparison. All perovskites are tested with the gas hourly space velocity（GHSV） of 30,000 hr^-1, and the temperature range of100–600℃ for C7H8 removal. Experimental results indicate that double perovskites have better activity if compared with single perovskites. Especially, toluene（C7H8） can be completely oxidized to CO2 at 300℃ as La2 Co MnO6 is applied. Characterization of catalysts indicates that double perovskites own unique surface properties and are of higher amounts of lattice oxygen,leading to higher activity. Additionally, apparent activation energy of 68 k J/mol is calculated using Mars-van Krevelen model for C7 H8 oxidation with La2 Co Mn O6 as catalyst. For durability test, both La2 Co Mn O6 and La2 CuMnO6 maintain high C7 H8 removal efficiencies of 100% and98%, respectively, at 300℃ and 30,000 hr^-1, and they also show good resistance to CO2（5%） and H2 O（g）（5%） of the gas streams tested. For various VOCs including isopropyl alcohol（C3H8 O）,ethanal（C2H4O）, and ethylene（C2H4） tested, as high as 100% efficiency could be achieved with double perovskite-type catalysts operated at 300–350℃, indicating that double perovskites are promising catalysts for VOCs removal.

关键词： Volatile organic compounds(VOCs) Toluene(C7H8) Double perovskite-type catalyst Catalysis Activation energy

Investigating the minimum detectable activity concentration and contributing factors in airborne gamma-ray spectrometry

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Nuclear Science and Techniques 2021年第10期32卷 30-38页

作者： Yi Gu Kun Sun Liang-Quan Ge Yuan-dong Li Qing-Xian Zhang Xuan guan Wan-chang Lai Zhong-Xiang Lin Xiao-Zhong Han The College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Key Laboratory of Applied Nuclear Techniques in Geosciences of Sichuan Province Chengdu University of TechnologyChengdu 610059China China Coal Geology Group Co. LtdBeijing 100040China

In this study,the theory of minimum detectable activity concentration(MDAC)for airborne gamma-ray spectrometry(AGS)was derived,and the relationship between the MDAC and the intrinsic effi-ciency of a scintillation counter,volume,and energy res-olution of scintillation crystals,and flight altitude of an aircraft was *** verify this theory,experi-mental devices based on NaI and CeBr 3 scintillation counters were prepared,and the potassium,uranium,and thorium contents in calibration pads obtained via the stripping ratio method and theory were *** MDACs of AGS under different conditions were calculated and analyzed using the proposed theory and the Monte Carlo *** relative errors found via a comparison of the experimental and theoretical results were less than 4%.The theory of MDAC can guide the work of AGS in probing areas with low radioactivity.

关键词： Airborne gamma-ray spectrometry(AGS) Minimum detectable activity concentration(MDAC) Sensitivity

Early Miocene Paleoaltitude of the Tuotuohe Basin,Central-Northern Tibetan Plateau and its Tectonic Implications

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1364-1372页

作者： LI Leyi chang Hong guan Chong LIU Weiguo CAO Yunning State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China University of Chinese Academy of Sciences Beijing 100049China Xi’an Institute for Innovative Earth Environment Research Xi’an 710061China CAS Center for Excellence in Quaternary Science and Global change Xi’an 710061China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China

Reconstruction of the paleoaltitude history of the Tibetan Plateau is critical for understanding the linkage between tectonics and its effect on regional and global climate ***,most of the paleoaltitude studies are concentrated on the southern and southeastern part of the Tibetan Plateau,and few studies have been conducted in the central-northern *** this paper we focused on the Wudaoliang Formation in the Tuotuohe Basin,central to northern Tibetan Plateau,to reconstruct paleoaltitude based on carbonate oxygen *** carbonate samples are primary or have experienced an early stage of *** on the thermodynamic and empirical model results,the paleoaltitude of the Wudaoliang Formation is found to be around 2700–3260 m(average of 2980±280 m)in the early Miocene(~24 Ma).Integrating paleoaltitude results from Wudaoliang Basin and our results,we conclude that crustal shortening and tectonic activity were strong during the late Eocene to late Oligocene-early Miocene and relatively weak during the early Miocene in the central-northern Tibetan Plateau.

关键词： paleoaltitude oxygen isotope crustal shortening Wudaoliang Formation Tuotuohe Basin Tibetan Plateau

Vacuum residue coking process simulation using molecular-level kinetic model coupled with vapor-liquid phase separation

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Chinese Journal of Chemical Engineering 2022年第1期35卷 301-310页

作者： Zhengyu Chen Xinhui Yao dong guan Suoqi Zhao Linzhou Zhang Chunming Xu State Key Laboratory of Heavy Oil Processing Petroleum Molecular Engineering Center(PMEC)China University of PetroleumBeijing 102249China

In this work,a molecular-level kinetic model was built to simulate the vacuum residue(VR)coking process in a semi-batch laboratory-scale reaction kettle.A series of reaction rules for heavy oil coking were summarized and formulated based on the free radical reaction ***,a large-scale molecularlevel reaction network was automatically generated by applying the reaction rules on the vacuum residue *** order to accurately describe the physical change of each molecule in the reactor,we coupled the molecular-level kinetic model with a vapor–liquid phase separation *** vapor–liquid phase separation model adopted the Peng-Robinson equation of state to calculate vapor–liquid equilibrium.A separation efficiency coefficient was introduced to represent the mass transfer during the phase *** used six sets of experimental data under various reaction conditions to regress the model *** tuned model showed that there was an excellent agreement between the calculated values and experimental ***,we investigated the effect of reaction temperature and reaction time on the product *** a comprehensive evaluation of the reaction temperature and reaction time,the optimal reaction condition for the vacuum residue coking was also obtained.

关键词： Kinetic modeling Molecular engineering Vapor-liquid equilibrium Vacuum residue coking

Association of Catalase Genotype with Oxidative Stress in the Predication of Colorectal Cancer:Modification by Epidemiological Factors

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Biomedical and Environmental Sciences 2012年第2期25卷 156-162页

作者： chang dong HU Zhang Liang ZHANG Lin ZHAO Ya Shuang MENG Qing Hui guan Qing Bai ZHOU Jin PAN Hong Zhi Department of Laboratory Diagnosis The First Affiliated Hospital of the Harbin Medical University Harbin 150001 Heilongjiang China The Second Affiliated Hospital of the Harbin Medical University Harbin 150001 Heilongjiang China College of Public Health Harbin Medical University Harbin 150081 Heilongjiang China

Objective This paper aims to assess the interaction between common variations in catalase（CAT） polymorphic gene and environmental factors for antioxidant defense enzyme in modulating individual susceptibility to colorectal cancer（CRC）.Methods A case-control study with 880 colorectal cancer cases and 848 controls was conducted to investigate whether variations in the catalase（CAT） gene,one of the genes involved in scavenging oxidative stress,influenced susceptibility to *** The interaction between life style and genotypes as well as with their effects on colorectal cancer was deduced from the present *** difference（P=0.01） was identified in the distribution of CAT genotype between the colorectal cancer cases and the *** CRC cases had significantly lower mean activity than the controls（P〈0.01）.Correlation analyses revealed statistically significant correlations between CAT activity and CAT genotype（P〈0.01）.Conclusion The risk of CRC was associated with smoking,low vegetable consumption,high pork and poultry consumptions,and low or high *** is the first study reporting an association of polymorphism CAT-21A〉T with colorectal *** CAT activity was associated with an increased risk of CRC;however,no evidence was found to support an association between CAT-21A〉T polymorphism and CRC risk.

关键词： Colorectal cancer (CRC) Oxidative stress Catalase (CAT) gene Epidemiological factors